1 N TT NGHIP THIT K CUNG CP IN CHO NH MY LIN HP DT LI NI U Nc ta ang trong giai on pht trin nhanh chng. Do yu cu pht trin ca t nc th in nng cng pht trin theo kp nhu cu v in. c th a in nng ti cc ph ti cn xy dng cc h thng cung cp in cho cc ph ti ny. Lnh vc cung cp in hin l mt lnh vc ang c rt nhiu vic phi lm. p ng nhu cu ngy cng tng ca sn xut, truyn ti in nng ni chung v thit k cung cp in ni ring, trng H in Lc H Ni ang o to mt i ng ng o cc k s h thng in. Thit k mt h thng in l mt vic lm kh. Mt cng trnh in d rt nh cng yu cu kin thc tng hp t nhiu chuyn ngnh hp (cung cp in, thit b in , li in , k thut in cao p , an ton , v.v ). Ngoi ra, ngi thit k cng cn phi c nhng hiu bit nht nh v x hi , mi trng , i tng cp in , tip th , Trong nhim v thit k n tt nghip, em c phn cng v phn thit k cung cp in , nhim v thc hin thit k cung cp in cho Nh my lin hp dt. Nh my lin hp dt l mt b phn quan trng trong sn xut cng nghip nh v hng tiu dng ca nc ta. Nh my c 9 phn xng sn xut, cn c cung cp mt ngun in nng tng i ln, ngun in c ly t ngun cao p qua cc TBA trung gian v nh my cung cp n cc phn xng. n gii thiu chung v nh my, v tr a l, c im cng ngh, phn b ph ti . ng thi cng xc nh ph ti tnh ton, thit k mng in h p, cao p, v h thng chiu sng cho cc phn xng cng nh ton nh my. Thng qua thit k v tnh ton cng a ra cc cch la chn s lng, dung lng v tr t TBA, trm phn phi in nng trung tm, cng nh tnh chn b cng sut phn khng cho h thng cung cp in cho ton nhn my . c s hng dn, ging dy nhit tnh ca cc thy, c gio trong b mn v c bit l ca thy gio Th.S Nguyn Tun Hon, em hon thnh nhim v c giao. Mc d rt c gng nhng kin thc v kinh nghim cn hn ch nn bn n ca em c th cn nhiu sai st, em rt mong c s ch bo ca cc thy, c. Em xin chn thnh cm n thy gio Th.S Nguyn Tun Hon cng cc thy c gio khc trong b mn H Thng in. H Ni , ngy 9 thng 1 nm 2011 Sinh vin thc hin: TRN HUY TP Thc hin: Trn Huy Tp Lp 1H3 Khoa H Thng in H in Lc2 N TT NGHIP THIT K CUNG CP IN CHO NH MY LIN HP DT Phn 1 TNH TON THIT K CUNG CP IN Chng 1 GII THIU CHUNG V TI THIT K I.GII THIU CHUNG V NH MY LIN HP DT 1. Loi hnh ngnh ngh, quy m v nng lc ca nh my 1.1. Loi hnh ngnh ngh Ngnh cng nghip nh ni chung v ngnh cng nghip dt may ni ring l mt ngnh sn xut quan trng trong nn kinh t quc dn ca nc ta, c nhim v cung cp cc sn phm ngnh hng tiu dng, dt may; c bit l cc sn phm may mc thi trang phc v cho nhu cu tiu dng trong nc v xut khu. Nhn chung ngnh cng nghip dt c mc pht trin rt nhanh v a li hiu qu to ln i vi kinh t trong nc. Trong nh my lin hp dt c nhiu h thng my mc, trang thit b khc nhau, rt a dng phong ph v phc tp. Cc h thng my mc ny c tnh cng ngh cao v hin i. Do vy, vic cung cp in cho nh my i hi phi m bo v cht lng, tnh lin tc v tin cy cao. 1.2. Qui m v nng lc ca nh my Nh my c tng din tch ln ti 187.000 m2, trong c 9 phn xng sn xut, cc phn xng c xy dng tng i lin nhau v phn b u trn mt bng s dng ca nh my vi tng cng sut d kin l 5680 kW. D kin trong tng lai nh my s xy dng, m rng thm mt s phn xng v lp t, thay th cc thit b my mc mi hin i hn sn xut ra nhiu sn phm cht lng cao p ng nhu cu trong v ngoi nc. ng v mt cung cp in, vic thit k in phi m bo s gia tng ph ti trong tng lai. V mt kinh t v k thut phi a ra phng n cp in sao cho khng gy ra qu ti sau vi nm sn xut, v cng khng gy qu d tha dung lng m sau nhiu nm nh my cng khng s dng ht cng sut d tr dn n lng ph. 2. Gii thiu qui trnh cng ngh ca nh my Ph ti in ca khu cng nghip c cp in t ngun h thng c khong cch 16 km qua ng dy trn khng nhm li thp (dy AC) hoc cp XLPE vi cp in p l 35 kV hoc 110 kV. Dung lng ng250 MVA. Thi gian xy dng cng trnh l 1nm, sut trit khu l 12%/nm, thi gian vn hnh cng trnh l 30 nm. Ph ti in ca nh my tng i tp trung, ngun in phc v sn xut trong phn xng ch yu l 0,4 kV. Nh my lm vic 3 ca, sn xut theo dy truyn vi thi gian s dng cng sut ln nht l 2500 gi. Thc hin: Trn Huy Tp Lp 1H3 Khoa H Thng in H in Lc3 N TT NGHIP THIT K CUNG CP IN CHO NH MY LIN HP DT Bng 1.1 Ph ti cc phn xng trong mt bng nh my STTTn phn xngCng sut tTmax (h) (kW) 1 2 3 4 5 6 7 8 9 B phn si B phn dt B phn nhum Phn xng l Phn xng sa cha c kh Phn xng mc Trm bm Ban qun l v phng th nghim Kho vt liu trung tm 1500 2800 350 300 250 160 120 150 50 2500 2500 2500 2500 2500 2500 2500 2500 2500 10Ph ti chiu sng cc phn xngXc nh theo din tch Bng 1.2 S mt bng nh my 1 2 3 4 T h thng in 5 8 6 9 7 T l: 1/5000 S mt bng cp in cho nh my Thc hin: Trn Huy Tp Lp 1H3 Khoa H Thng in H in Lc 4 N TT NGHIP THIT K CUNG CP IN CHO NH MY LIN HP DT 2.1. Bn v tm tt quy trnh cng ngh nh my lin hp dt S Sn xut si Sn xut thm Thm thnh phm Sn xut vi Quy trnh s l t Sn xut si Si thnh phm Qu trnh may Sn phm may mc Sn xut vi l qu trnh lin quan n dt thoi v dt kim, cy lng nhung v khng dt. i vi vi dt c thnh phn i t nguyn liu polyester, thnh phn PET c th ln ti 100%vi kiu dt rt phong ph c dng trong th thao v c trong sinh hot. Vi c dt t si pha x, c th pha hai hoc nhiu loi x. Vi dt thoi l sn phm dng tm, do hai h thng si an thng gc nhau to thnh. H thng nm dc theo chiu di tm vi gi l si dc, h thng kia gi l si ngang.Vi dt kim l mt loi sn phm dt c hnh thnh bi cc vng si mc ni nhau. Cu trc vi dt kim c xc nh bi dng v kch thc vng, quy cch si, kiu an, mt vng, cha y. 2.2. Mc tin cy cung cp in t quy trnh cng ngh nh my cho qu trnh sn xut ca nh my c m bo tt th vic cung cp in cho nh my v cc b phn quan trng trong nh my nh cc phn xng Si, dt, nhum, l phi m bo cht lng in nng, tnh lin tc v tin cy cao. Theo quy trnh cng ngh sn xut ca nh my th vic ngng cung cp in s nh nh rt ln n s lng, cht lng ca sn phm, gy thit hi rt ln v kinh t. V vy, theo Quy phm trang b in nh my c xp vo ph ti loi I. 3. Gii thiu ph ti in ca nh my 3.1. c im ca ph ti in Ph ti in ca nh my lin hp dt c th phn ra lm 2 loi ph ti nh sau + Ph ti ng lc. + Ph ti chiu sng. Thc hin: Trn Huy Tp Lp 1H3 Khoa H Thng in H in Lc 5 N TT NGHIP THIT K CUNG CP IN CHO NH MY LIN HP DT Ph ti ng lc thng c ch lm vic di hn, in p yu cu trc tip n thit b l 380/220 V, cng sut ca chng nm trong khong t 1 cho ti vi chc kW v c cung cp bi ngun in xoay chiu c tn s cng nghip l 50 Hz. Ph ti chiu sng thng l ph ti 1 pha cng sut khng ln. Ph ti chiu sng thng bng phng, t thay i v thng dng dng in xoay chiu c tn s 50 Hz. lch in p trong mng chiu sng l Ucp . 3.2. Cc yu cu cung cp in ca nh my Cn c theo quy trnh cng ngh sn xut ca nh my v c im ca cc thit b, my mc trong cc phn xng, ta thy t l phn trm ph ti loi I ln hn ph ti loi III, do nh my c nh gi l h ph ti loi I v vic cung cp in yu cu phi c m bo lin tc. Bng 1.3 Bng phn nhm cc thit b ph ti nh my S TT Tn thit b K hiu Nh n Cng sut (KW) trnShiu1 myTon b mt bng l-ng 1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 2 My tin ren My tin ren My tin ren My tin ren cp chnh xc cao My doa to My bo ngang My xc My phay vn nng My phay ngang My phay ng My mi trn My mi phng My mi trn My khoan ng My khoan ng My ct mp My mi vn nng My mi dao ct gt My mi mi khoan My mi sc mi phay May mi dao chut My mi mi khot Thit b ho bn kim loi My gia 3 1 2 3 4 5 6 7 8 9 10 11 12 13 15 14 16 17 18 19 20 21 22 23 24 4 2 2 2 1 1 2 1 1 1 2 2 1 1 1 1 1 1 1 1 1 1 1 1 1 5 IA616 IA62 IK62 2A450 7M36 7A420 8H82 6H82 6H11 3A240 311MI 3130 2A125 2135 866A 3A64 3818 36652 3667 360 3659 -58 - 6 7,0 7,0 10,0 2,0 2,0 7,0 3,0 7,0 7,0 2,5 4,0 2,5 2,5 4,5 3,0 4,5 1,5 0,5 1,5 1,0 0,5 2,5 1,0 2,5 7 14,0 14,0 20,0 2,0 2,0 14,0 3,0 7,0 7,0 5,0 8,0 2,5 2,5 4,5 3,0 4,5 1,5 0,5 1,5 1,0 0,5 2,5 1,0 2,5 Thc hin: Trn Huy Tp Lp 1H3 Khoa H Thng in H in Lc 25 26 28 2 1 hiu 6 N TT NGHIP THIT K CUNG CP IN CHO NH MY LIN HP DT S TT Tn thit b K hiu Nh n Cng sut (KW) 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 My khoan bn My mi trn My mi th My canh 1 My canh 2 My canh phn hng My h 1 My h 2 My h 3 My dt CTD My dt CTM My xn lng Mt dt kim My cng nh hnh My dt kim My cn lng My dt kim My m kh My dt CTM My cun dy My ct mp My dt CTM trn mt bng 29 27 30 41 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 S l-ng 1 2 2 1 1 1 1 36 18 18 20 18 20 16 27 9 20 18 12 24 HC125 - 3M634 MC228 - - 0,5 1,5 2,5 18,0 16,0 9,0 12,0 12,0 12,0 12,0 12,0 12,0 8,5 8,5 8,5 8,5 8,5 8,5 12,0 12,0 12,0 12,0 1,0 1,5 2,5 36,0 32,0 9,0 12,0 12,0 12,0 432,0 216,0 216,0 170,0 153,0 170,0 136,0 229,5 76,5 240,0 216,0 144,0 288,0 B phn sa cha 47 48 49 50 51 52 53 54 55 56 57 58 My tin ren My tin ren My tin ren My tin ren My tin ren My khoan ng My khoan h-ng tm My bo ngang My bo ngang My mi ph My bin p hn My khoan bo 31 32 33 34 35 36 37 38 39 40 43 42 3 1 1 3 1 2 1 1 1 1 1 1 1616 1A62 1624M 163 2A135 2A53 7A35 7A36 3M634 - HCI2A 4,0 7,0 6,0 10,0 14,0 4,5 4,5 2,5 10,0 4,5 21,0 0,5 12,0 7,0 6,0 30,0 14,0 9,0 4,5 2,5 10,0 4,5 21,0 0,5 4. Phm vi ti y l ti thit k tt nghip nn vic tnh ton chnh xc v t m cho cng trnh l mt khi lng ln, i hi phi c thi gian di. Do , ta ch tnh ton chn cho cc hng mc chnh quan trng ca cng trnh. Sau y s l ni dung chnh m bn thit k s cp + Thit k mng in phn xng. Thc hin: Trn Huy Tp Lp 1H3 Khoa H Thng in H in Lc7 N TT NGHIP THIT K CUNG CP IN CHO NH MY LIN HP DT + Thit k mng in nh my. + Tnh ton ngn mch chn v kim tra thit b. + Thit k trm bin p cho phn xng. + Thit k ng dy 35 kV t TBA trung gian v nh my. + Tnh ton b cng sut phn khng cho mng in. + Thit k chiu sng cho phn xng (phn xng sa cha c kh). + Thit k ni t cho cc TBA phn xng. 5. Cc ti liu tham kho 1. Ng Hng Quang V Vn Tm, Thit k cp in Nxb Khoa hc v k thut 2008. 2. TS.Trn Quang Khnh, Bi tp cung cp in Nxb Khoa hc k thut. 3. TS.Trn Quang Khnh, Cung cp in Nxb Khoa hc k thut. 4. PGS TS. Phm Vn Ha, Nh my in Nxb Khoa hc k thut. 5. PGS TS. Phm Vn Ha, Ngn mch v t dy trong h thng in Nxb Khoa hc v k thut. 6.Mng v li in Nguyn Vn m Nxb khoa hc k thut. 7. Nguyn Th Minh Chc, K thut in cao p Nxb khoa hc k thut 8.PTS Nguyn nh Thng, in t trng v s pht nhit ca h thng cp n trong li in cao p ba pha , Tp ch in lc, 6-1997,7-1997. 9.T.sV Thanh Hi, Bo co ti nghin cu khoa hc nghin c tc ng qua li gia yu t mi trng kh hu v qu trnh lo ho cch in cp in lc trong h thng in Vit Nam, Vin Nng Lng, H ni 2004. 10.Bo co, Pht trin mng li cp ngm ti thnh ph H ni, Hi tho cp ngm, H ni 2003. 11.V Hoi Nam, Thit k h thng cp ngm cao p v nghin cu vn o pha ni t, Lun vn thc s 2004, HBK HN. Thc hin: Trn Huy Tp Lp 1H3 Khoa H Thng in H in Lc8 N TT NGHIP THIT K CUNG CP IN CHO NH MY LIN HP DT CHNG 2 TNG HP PH TI XC NH PH TI TNH TON CA CC PHN XNG V TON NH MY I. TNG QUAN V CC PHNG PHP XC NH PH TI TNH TON 1. Khi nim v ph ti tnh ton Ph ti tnh ton l mt s liu rt c bn dng thit k h thng cung cp in (CC). Ph ti tnh ton l ph ti gi thit lu di khng i, tng ng vi ph ti thc t (bin i) v mt hiu ng nhit ln nht. N cn thit cho vic chn cc trang thit b CC trong mi trng thi vn hnh h thng CC. Trong thc t, vn hnh ch di hn ngi ta mun rng ph ti thc t khng gy ra nhng pht nng cc trang thit b CC ; ngoi ra, cc ch ngn hn th n khng gy tc ng cho cc thit b bo v. Nh vy, ph ti tnh ton thc cht l ph ti gi thit tng ng vi ph ti thc t v mt vi phng din no . Ni mt cch khc, ph ti tnh ton cng lm nng vt dn ln ti nhit bng nhit ln nht do ph ti thc t gy ra. Nh vy nu chn cc thit b in theo ph ti tnh ton th c th m bo an ton v mt pht nng cho cc thit b trong mi trng thi vn hnh. 1.1. Phn loi v phn nhm ph ti Vic thc hin phn loi v phn nhm ph ti thun tin cho vic tnh ton v thit k. 1.1.1. Phn loi ph ti Cn phn tch quy trnh cng ngh c trong phn xng hoc da vo tn thit b, cng sut v vai tr ca n trong dy truyn cng ngh, m phn tch xem cc thit b ny c yu cu khc thng no v CC hay khng ? (VD c nhm thit b yu cu tn s 50 Hz, c nhm yu cu ngun 1 chiu, ngun 1 pha, ). Trong cc trng hp ny, khi thit k CC chng ta cn phi tnh chn cc thit b u cho chng nh b bin tn, b ngun chnh lu MBA, v.vv khi cng sut tnh ton phi c ly bng cng sut tiu th ca cc thit b u vo c k n tn hao cng sut ca chng. Ngoi ra, cc nhm thit b ny cn c th c yu cu khc thng v tnh lin tc CC. Tm li, chng ta cn phi vch ra c nhng thit b hoc nhm thit b c yu cu CC khc nhau, nh gi chng thuc h tiu th loi no (h loi I, II hay loi III). Vi phn xng sa cha c kh nu ch xt v chc nng chung trong dy truyn cng ngh ca ton b nh my, th thng thng ch c xt vo h loi III . Tuy nhin, nu c thm cc thit b hoc nhm thit b c bit c yu cu cao v tnh lien tc CC th cng c th xt vo h loi II. 1.1.2. Phn nhm ph ti Vic phn cc thit b trong phn xng thnh tng nhm ring r s to iu kin thun li cho vic tnh ton v thit k CC sau ny. Mi nhm thit b thong thng s c CC t mt t ng lc ring bit ; v v vy, nguyn tc chung phn nhm cc thit b nh sau Thc hin: Trn Huy Tp Lp 1H3 Khoa H Thng in H in LcIII 9 N TT NGHIP THIT K CUNG CP IN CHO NH MY LIN HP DT Cc thit b trong mt nhm phi c v tr gn nhau trn mt bng (iu ny s thun tin cho vic i dy trnh chng cho, gim tn tht ). Cc thit b trong mt nhm ln c cng mt ch lm vic (iu ny s thun tin cho tnh ton v CC sau ny, v nu chng c cng cng sut th s thit b in lm vic hiu qu ng bng s thit b thc t). Do , vic xc nh ph ti cho cc nhm thit b ny s d dng. Cc thit b trong cc nhm c phn b tng cng sut ca cc nhm t chnh lch nht (iu ny nu thc hin c s to ra tnh ng lot cho cc trang thit b CC). S thit b trong cng mt nhm cng khng nn qu nhiu, v s l ra ca mt t ng lc cng b khng ch. Ngoi ra, cc thit b i khi cn c nhm li theo cc yu cu ring ca qun l hnh chnh hoc ca qun l hoch ton ring bit ca tng b phn trong phn xng. Cn c vo v tr, cng sut c tnh ca my mc thit b in trn mt bng cc phn xng, ta c bng phn loi v phn nhm cho cc ph ti in nh sau Bng 2.1 Phn loi ph ti cc phn xng trong mt bng nh my STT 1 2 3 4 5 6 7 8 9 Tn phn xng B phn si B phn dt B phn nhum Phn xng l Phn xng sa cha c kh Phn xng mc Trm bm Ban qun l v phng th nghim Kho vt liu trung tm Cng sut t (kW) 1500 2800 350 300 250 160 120 150 50 H tiu th loi I I I I III III III III III 10Ph ti chiu sng cc phn xngXc nh theo din tch Bng 2.2 Bng phn nhm thit b in ca phn xng sa cha c kh TTTn nhm v tn thit bK hiu trn mt bng S lng Cng sut t (kW) Ton b (kW) Nhm 1 1 2 3 4 5 6 7 8 My tin ren My tin ren My tin ren My tin ren cp chnh xc cao My doa to My bo ngang My xc My phay vn nng 1 2 3 4 5 6 7 8 2 2 2 1 1 2 1 1 7,0 7,0 10,0 2,0 2,0 7,0 3,0 7,0 14,0 14,0 20,0 2,0 2,0 14,0 3,0 7,0 Cng theo nhm 11276,0 Thc hin: Trn Huy Tp Lp 1H3 Khoa H Thng in H in Lc 10 N TT NGHIP THIT K CUNG CP IN CHO NH MY LIN HP DT Nhm 2 9 10 11 12 13 14 15 16 17 18 My mi trn My mi phng My mi trn My mi vn nng My mi dao ct gt My mi mi khoan My mi sc mi phay My mi dao chut My mi mi khot My mi th 11 12 13 17 18 19 20 21 22 28 2 1 1 1 1 1 1 1 1 1 4,0 2,5 2,5 1,5 0,5 1,5 1,0 0,5 2,5 2,5 8,0 2,5 2,5 1,5 0,5 1,5 1,0 0,5 2,5 2,5 Cng theo nhm 2 Nhm 3 1123,0 19 20 21 22 23 24 25 26 27 My phay ngang My phay ng My khoan ng My khoan ng My ct mp Thit b ho bn kim loi My gia My khoan bn My mi trn 9 10 14 15 16 23 24 25 26 1 2 1 1 1 1 1 2 1 7,0 2,5 3,0 4,5 4,5 1,0 2,5 0,5 1,5 7,0 5,0 3,0 4,5 4,5 1,0 2,5 1,0 1,5 Cng theo nhm 3 Nhm 4 1130,0 28 29 30 31 32 33 34 My tin ren My tin ren My tin ren My tin ren My tin ren My khoan hng tm My bo ngang 31 32 33 34 35 37 38 3 1 1 3 1 1 1 4,0 7,0 6,0 10,0 14,0 4,5 2,5 12,0 7,0 6,0 30,0 14,0 4,5 2,5 Cng theo nhm 4 Nhm 5 1176,0 35 36 37 38 39 My khoan ng My bo ngang My mi ph My khoan bo My bin p hn 36 39 40 42 43 2 1 1 1 1 4,5 10,0 4,5 0,5 21,0 9,0 10,0 4,5 0,5 21,0 Cng theo nhm 5645,0 Thc hin: Trn Huy Tp Lp 1H3 Khoa H Thng in H in Lc 8 11 N TT NGHIP THIT K CUNG CP IN CHO NH MY LIN HP DT Bng 2.3 Bng phn nhm thit b in ca phn xng dt TTTn nhm v tn thit bK hiu trn mt bng S lng Cng sut t (kW) Ton b (kW) Nhm 1 1 2 3 4 5 6 My canh 1 My canh 2 My canh phn hng My h 1 My h 2 My h 3 29 27 30 41 44 45 2 2 1 1 1 1 18,0 16,0 9,0 12,0 12,0 12,0 36,0 32,0 9,0 12,0 12,0 12,0 Cng theo nhm 1 Nhm 2 113,0 7My dt CTD463612,0432,0 Cng theo nhm 2 Nhm 3 36432,0 8 9 My dt CTM My xn lng 47 48 18 18 12,0 12,0 216,0 216,0 Cng theo nhm 3 Nhm 4 36432,0 10 11 My dt kim My cng nh hnh 49 50 20 18 8,5 8,5 170,0 153,0 Cng theo nhm 4 Nhm 5 38323,0 12 13 My dt kim My cn lng 51 52 20 16 8,5 8,5 170,0 136,0 Cng theo nhm 5 Nhm 6 36306,0 14 15 My dt kim My m kh 53 54 27 9 8,5 8,5 229,5 76,5 Cng theo nhm 6 Nhm 7 36306,0 16 17 My dt CTM My cun dy 55 56 20 18 12,0 12,0 240,0 216 Cng theo nhm 7 Nhm 8 38456,0 18 19 My ct mp My dt CTM 57 58 12 24 12,0 12,0 144,0 288,0 Cng theo nhm 836432,0 1.2. Cc phng php xc nh ph ti tnh ton Hin nay, c nhiu nghin cu v cc phng php xc nh ph ti tnh ton, nhng cc phng php thng c dung ch yu l Thc hin: Trn Huy Tp Lp 1H3 Khoa H Thng in H in Lctt tt tt 2 tt tt 12 N TT NGHIP THIT K CUNG CP IN CHO NH MY LIN HP DT 1.2.1. Xc nh ph ti tnh ton theo cng sut trung bnh v h s cc i Theo phng php ny, ta c Trong PttK M .PtbK M .K sd .Pdm bb2 ac 2a T = 30 pht. Ptb Cng sut trung bnh ca ph ti trong ca mang ti ln nht. Pm Cng sut nh mc ca ph ti. Ksd h s s dng cng sut ca ph ti. KM H s cc i cng sut tc dng vi khong thi gian trung bnh ha Phng php ny thng c dng tnh ph ti tnh ton cho mt nhm thit b, cho cc t ng lc trong ton b phn xng. N cho mt kt qu chnh xc nhng li i hi mt lng thng tin kh y v cc ph ti nh ch lm vic ca tng ph ti, cng sut t ca tng ph ti, s lng thit b trong nhm (Ksdi ; Pmi ; cos i ; .). 1.2.2. Xc nh ph ti tnh ton theo cng sut trung bnh v lch trung bnh bnh phng Vi phng php ny th ta c PPtb tb Trong Ptb Ph ti trung bnh ca th nhm ph ti. tb lch ca th nhm ph ti. Phng php ny thng c dng tnh ton ph ti cho cc nhm thit b ca phn xng hoc ca ton b x nghip. Tuy nhin, phng php ny t c dng trong tnh ton thit k mi v n i hi kh nhiu thng tin v ph ti m ch ph hp vi cc h thng ang vn hnh. 1.2.3. Xc nh ph ti tnh ton theo cng sut trung bnh v h s hnh dng Ta c hd .Ptb Qtthdq .Qtb.tg Stt P 2 ttP CosTrong Ptb ; Qtb Ph ti tc dng v phn khng trung bnh trong ca mang ti ln nht. Khd ; Khdq H s hnh dng (tc dng v phn khng) ca th ph ti. Phng php ny c th p dng tnh ph ti tnh ton thanh ci t phn phi phn xng hoc thanh ci h p ca trm bin p phn xng. Phng php ny t c dng trong tnh ton thit k mi v n yu cu c th ca nhm ph ti. 1.2.4. Xc nh ph ti tnh ton theo cng sut t v h s nhu cu Theo phng php ny th Pttp0.F PttKnc .Pd Trong Thc hin: Trn Huy Tp Lp 1H3 Khoa H Thng in H in Lctt 13 N TT NGHIP THIT K CUNG CP IN CHO NH MY LIN HP DT Knc H s nhu cu ca nhm ph ti. P Cng sut t ca nhm ph ti. Phng php ny cho kt qu khng chnh xc lm, tuy vy li n gin v c th nhanh chng cho kt qu, cho nn n thng c dng tnh ph ti tnh ton cho cc phn xng, cho ton x nghip khi khng c nhiu cc thng tin v cc ph ti hoc khi tnh ton s b phc v cho vic quy hoch .. 1.2.5. Xc nh ph ti tnh ton theo sut ph ti trn mt n v din tch sn xut Ta c Pttp0.F Trong p0 Sut ph ti tnh ton cho mt n v din tch sn xut. F Din tch sn xut c b tr cc thit b dng in. Phng php ny thng ch c dng c tnh ph ti in v n cho kt qu khng chnh xc. Tuy vy, n vn c th c dng cho mt s ph ti c bit m chi tiu tiu th in ph thuc vo din tch hoc c s phn b ph ti kh ng u trn din tch sn xut. 1.2.6. Xc nh ph ti tnh ton theo sut tiu hao in nng trn mt n v sn phm v tng sn lng Trong phng php ny, ta c Ptb M .0 T PK M .Ptb Trong 0 Sut chi ph in cho mt n v sn phm (kWh/1v). M Tng sn phm sn xut ra trong khong thi gioan kho st T (1 ca ; 1 nm). Ptb Ph ti trung bnh ca x nghip. KM H s cc i cng sut tc dng. Phng php ny thng ch c s dng c tnh, s b xc nh ph ti trong cng tc quy hoch hoc dng quy hoch ngun cho x nghip. 1.2.7. Xc nh ph ti nh nhn ca nhm thit b Theo phng php ny th ph ti nh nhn ca nhm thit b s xut hin khi thit b c dng khi ng ln nht m my cn cc thit b khc trong nhm lm vic bnh thng v c tnh theo cng thc sau Trong In = Ik max + Itt Ksd.Im max Ik max - dng khi ng ca thit b c dng khi ng ln nht trong nhm. Itt - dng tnh ton ca nhm my. Im max - dng nh mc ca thit b ang khi ng. Ksd - h s s dng ca thit b ang khi ng. Thc hin: Trn Huy Tp Lp 1H3 Khoa H Thng in H in Lc 8 14 N TT NGHIP THIT K CUNG CP IN CHO NH MY LIN HP DT 2. Xc nh ph ti tnh ton ca phn xng dt Theo bng 2.3 Bng phn nhm ph ti trong phn xng dt. Bng phn nhm thit b in ca phn xng dt TTTn nhm v tn thit bK hiu trn mt bng S lng Cng sut t (kW) Ton b (kW) Nhm 1 1 2 3 4 5 6 My canh 1 My canh 2 My canh phn hng My h 1 My h 2 My h 3 29 27 30 41 44 45 2 2 1 1 1 1 18,0 16,0 9,0 12,0 12,0 12,0 36,0 32,0 9,0 12,0 12,0 12,0 Cng theo nhm 1 Nhm 2 113,0 7My dt CTD463612,0432,0 Cng theo nhm 2 Nhm 3 36432,0 8 9 My dt CTM My xn lng 47 48 18 18 12,0 12,0 216,0 216,0 Cng theo nhm 3 Nhm 4 36432,0 10 11 My dt kim My cng nh hnh 49 50 20 18 8,5 8,5 170,0 153,0 Cng theo nhm 4 Nhm 5 38323,0 12 13 My dt kim My cn lng 51 52 20 16 8,5 8,5 170,0 136,0 Cng theo nhm 5 Nhm 6 36306,0 14 15 My dt kim My m kh 53 54 27 9 8,5 8,5 229,5 76,5 Cng theo nhm 6 Nhm 7 36306,0 16 17 My dt CTM My cun dy 55 56 20 18 12,0 12,0 240,0 216 Cng theo nhm 7 Nhm 8 38456,0 18 19 My ct mp My dt CTM 57 58 12 24 12,0 12,0 144,0 288,0 Cng theo nhm 836432,0 Thc hin: Trn Huy Tp Lp 1H3 Khoa H Thng in H in Lc8 = = 15 N TT NGHIP THIT K CUNG CP IN CHO NH MY LIN HP DT 2.1. Xc nh ph ti tnh ton ca cc nhm ph ti trong phn xng dt 2.1.1. Tnh ton ph ti cho nhm 1 Bng 2.4 Danh sch cc thit b ph ti nhm 1 phn xng dt TTTn nhm v tn thit bK hiu trn mt bng S lng Cng sut t (kW) Ton b (kW) Nhm 1 1 2 3 4 5 6 My canh 1 My canh 2 My canh phn hng My h 1 My h 2 My h 3 29 27 30 41 44 45 2 2 1 1 1 1 18,0 16,0 9,0 12,0 12,0 12,0 36,0 32,0 9,0 12,0 12,0 12,0 Cng theo nhm 1113,0 Tra ph lc PL 1.1 TL1 (Thit k cp in ca Ng Hng Quang) tm c ksd = 0,7 ; cos = 0,7tgta c n=8; mPdmmax Pdm min 18 9 ksdnhqnTra h lc I.6 TL1 vi ksd = 0,7 v nhq = 8 tm c kmax = 1,2 Ph ti tnh ton nhm 1 Cng sut tc dng tnh ton n Ptt = kmax .ksd .Pdmi = 1, 2.0, 7.113 = 94,92 (kW) i=1 Cng sut phn khng tnh ton Qtt = Ptt . tg = 94,92 . 1,02 = 96,82 (kVAr) Cng sut biu kin tnh ton Stt = Ptt cos = 94,92 0, 7 (kVA) Dng in tnh ton ca nhm IttStt 3.U dm 135, 60.103 3.380 A) Dng in nh mc ca thit b I dmiPdmi 3.U dmi .c I dm maxPdm max 3.U dm max .c18.103 3.380.0, 7 A) Dng nh nhn ca nhm thit b Ikmax = kmm . Immax (v Pmmaxmm = kk = 5) kmax = 5 . 39,07 = 195,35 (A) Thc hin: Trn Huy Tp Lp 1H3 Khoa H Thng in H in Lc16 N TT NGHIP THIT K CUNG CP IN CHO NH MY LIN HP DT n = Ikmax + Itt - ksd . Immax In = 195,35 + 206,02 (0,7 . 39,07) = 374,02 (A). 2.1.2. Tnh ton cho cc nhm ph ti cn li ca phn xng dt Vi cch tnh ton tng t, cc ph ti cn li ca cc nhm (t nhm 2 8) ca phn xng dt c tnh ton nh cc ph ti trong nhm 1 ca phn xng. Qua , ta c c kt qu tnh ton cho cc nhm trong phn xng dt nh sau: Thc hin: Trn Huy Tp Lp 1H3 Khoa H Thng in H in Lc 1 1 1 1 17 N TT NGHIP THIT K CUNG CP IN CHO NH MY LIN HP DT Bng 2.5 Kt qu phn nhm ph ti ca phn xng dt Tn nhm v thit b 1 K hiu trn bn v 2 S lng 3 Pm, kW 4 m = Pdm max Pdm min 5 Ksd 6 Cos/ tg 7 nhq 8 Kmax 9 Itt (A) 10 Ptt (kW) 11 Qtt, kVAr 12 Stt, kVA 13 Nhm 1 My canh 1 My canh 2 My canh phn hng My h 1 My h 2 My h 3 29 27 30 41 44 45 2 2 1 1 1 1 2 x 18,0 2x16,0 9,0 12,0 12,0 12,0 0,7 0,7 0,7 0,7 0,7 0,7 0,7/1,02 0,7/1,02 0,7/1,02 0,7/1,02 0,7/1,02 0,7/1,02 Cng theo nhm 18113,020,70,7/1,0281,2206,0294,9296,82135,60 Nhm 2 My dt CTD463636x12,00,70,7/1,02 Cng theo nhm 236432,00,70,7/1,02361,09715,44329,62 336,21470,89 Nhm 3 My dt CTM My xn lng 47 48 18 18 18x12,0 18x12,0 0,7 0,7 0,7/1,02 0,7/1,02 Cng theo nhm 336432,00,70,7/1,02361,09715,44329,62 336,21470,89 Nhm 4 My dt kim My cng nh hnh 49 50 20 18 20x8,5 18x8,5 0,7 0,7 0,7/1,02 0,7/1,02 Cng theo nhm 438323,00,70,7/1,02381,09764,17352,07 359,11502,96 Nhm 5 My dt kim My cn lng 51 52 20 16 20x8,5 16x8,5 0,7 0,7 0,7/1,02 0,7/1,02 Cng theo nhm 536306,00,70,7/1,02361,09506,76233,48 238,15333,54 Nhm 6 My dt kim My m kh 53 54 27 9 27x8,5 9x8,5 0,7 0,7 0,7/1,02 0,7/1,02 Thc hin: Trn Huy Tp Lp 1H3 Khoa H Thng in H in Lc 1 1 1 18 N TT NGHIP THIT K CUNG CP IN CHO NH MY LIN HP DT Cng theo nhm 6 36 306,0 0,7 0,7/1,02 36 1,09 506,76 233,48 238,15 333,54 Nhm 7 My dt CTM My cun dy 55 56 20 18 20x12,0 18x12,0 0,7 0,7 0,7/1,02 0,7/1,02 Cng theo nhm 738456,00,70,7/1,02381,091078,82497,04 506,98710,06 Nhm 8 My dt CTM My ct mp 57 58 24 12 24x12,0 12x12,0 0,7 0,7 0,7/1,02 0,7/1,02 Cng theo nhm 836432,00,70,7/1,02381,09715,44329,62 336,21470,89 Thc hin: Trn Huy Tp Lp 1H3 Khoa H Thng in H in Lc19 N TT NGHIP THIT K CUNG CP IN CHO NH MY LIN HP DT 2.2. Xc nh ph ti chiu sng ca phn xng dt Ph ti chiu sng ca phn xng dt c xc nh theo phng php sut chiu sng trn mt n v din tch Trong Pcs = po . F po sut chiu sng trn mt n v din tch (W/m2) F Din tch c chiu sng (m2) Trong phn xc po = 16 W/m2 Ph ti chiu sng ca phn xng Pcs = po . F = 16 . 3600 = 57,60 (kW) Qcs = Pcs . tgcs = 57,60 . 0,62 = 35,71 (kVAr) 2.3. Xc nh ph ti tnh ton ca ton phn xng Ph ti tc dng (ng lc) ca ton phn xng 5 Pdl = K dt .Ptti = 0,85.(94,92+329,62+329,62+233,48+352,07+329,62+233,48+497,04) i=1 = 2039,88 ( kW) Trong Kdt l h s ng thi ca ton phn xng, ly Kdt = 0,85 Ph ti phn khng ca phn xng 5 Qdl = K dt .Qtti i=1 = 0,85 .(96,82 + 336,21 + 336,21 + 359,11 + 238,15 + 238,15 + 506,98 + 336,12) = 2080,66 kVAr Ph ti ton phn ca phn xng k c chiu sng Pttpxdt = Pdlpx + Pcspx = 2039,88 + 57,60 = 2097,48 (kW) Qttpxdt = Qdlpx + Qcspx= 2080,66 + 35,71 = 2116,37 (kVAr) Sttpx = Ptt 2 +Qtt 2 = 2097, 482 +2116,372 = 2979,67 ( kVA ) Cospx = Pttpx Sttpx = 2097, 48 2979, 67 = 0, 70 3. Xc nh ph ti tnh ton ca phn xng sa cha c kh 3.1. Phn loi v phn nhm ph ti in trong phn xng sa cha c kh Trong phn xng, cc thit b phn ln u lm vic ch di hn. Ch c ph ti my bin p hn lm vic ch ngn hn lp li v s dng in p dy. Do cn quy i v ch lm vic di hn Pqd = 3.Pdm. kd % = 3.24,5. 0, 25 = 21,0(kW) phn nhm ph ti ta da theo nguyn tc sau Cc thit b trong nhm nn c cng mt ch lm vic. Cc thit b trong nhm nn gn nhau trnh chng cho v gim chiu di dy dn h p. Cng sut cc nhm cng nn khng qu chnh lch nhm nhm gim chng loi t ng lc. Thc hin: Trn Huy Tp Lp 1H3 Khoa H Thng in H in Lc 20 N TT NGHIP THIT K CUNG CP IN CHO NH MY LIN HP DT Cn c vo v tr, cng sut ca cc my cng c b tr trn mt bng phn xng ta chia ra lm 5 nhm thit b ph ti nh theo bng 2.2 trn, ta c + Nhm 1 1; 3; 7; 6; 4; 2; 8 + Nhm 2 12; 13; 11; 22; 20; 19; 21; 17; 18; 28 + Nhm 3 9; 14; 10; 16; 23; 24; 25; 15; 26 + Nhm 4 34; 32; 33; 38; 31; 35; 37 + Nhm 5 39; 42; 36; 43; 40 Bng phn nhm thit b in ca phn xng sa cha c kh TTTn nhm v tn thit bK hiu trn mt bng S lng Cng sut t (kW) Ton b (kW) Nhm 1 1 2 3 4 5 6 7 8 My tin ren My tin ren My tin ren My tin ren cp chnh xc cao My doa to My bo ngang My xc My phay vn nng 1 2 3 4 5 6 7 8 2 2 2 1 1 2 1 1 7,0 7,0 10,0 2,0 2,0 7,0 3,0 7,0 14,0 14,0 20,0 2,0 2,0 14,0 3,0 7,0 Cng theo nhm 1 Nhm 2 1276,0 9 10 11 12 13 14 15 16 17 18 My mi trn My mi phng My mi trn My mi vn nng My mi dao ct gt My mi mi khoan My mi sc mi phay My mi dao chut My mi mi khot My mi th 11 12 13 17 18 19 20 21 22 28 2 1 1 1 1 1 1 1 1 1 4,0 2,5 2,5 1,5 0,5 1,5 1,0 0,5 2,5 2,5 8,0 2,5 2,5 1,5 0,5 1,5 1,0 0,5 2,5 2,5 Cng theo nhm 2 Nhm 3 1123,0 19 20 21 22 23 24 25 26 27 My phay ngang My phay ng My khoan ng My khoan ng My ct mp Thit b ho bn kim loi My gia My khoan bn My mi trn 9 10 14 15 16 23 24 25 26 1 2 1 1 1 1 1 2 1 7,0 2,5 3,0 4,5 4,5 1,0 2,5 0,5 1,5 7,0 5,0 3,0 4,5 4,5 1,0 2,5 1,0 1,5 Cng theo nhm 31130,0 Nhm 4 Thc hin: Trn Huy Tp Lp 1H3 Khoa H Thng in H in Lc* 21 N TT NGHIP THIT K CUNG CP IN CHO NH MY LIN HP DT 28 29 30 31 32 33 34 My tin ren My tin ren My tin ren My tin ren My tin ren My khoan hng tm My bo ngang 31 32 33 34 35 37 38 3 1 1 3 1 1 1 4,0 7,0 6,0 10,0 14,0 4,5 2,5 12,0 7,0 6,0 30,0 14,0 4,5 2,5 Cng theo nhm 4 Nhm 5 1176,0 35 36 37 38 39 My khoan ng My bo ngang My mi ph My khoan bo My bin p hn 36 39 40 42 43 2 1 1 1 1 4,5 10 4,5 0,5 21,0 9 10 4,5 0,5 21,0 Cng theo nhm 5645,0 3.2. Xc nh ph ti tnh ton ca cc nhm ph ti (Cc g tr ksd, cos v kmax tra ph lc .) 3.2.1. Xc nh ph ti tnh ton nhm 1 Bng 2.6 Danh sch thit b thuc nhm 1 TTTn nhm v tn thit bK hiuS lngCng sutCngsut trn mt bng Nhm 1 t (kW) ton b (kW) 1 2 3 4 5 6 7 8 My tin ren My tin ren My tin ren My tin ren cp chnh xc cao My doa to My bo ngang My xc My phay vn nng 1 2 3 4 5 6 7 8 2 2 2 1 1 2 1 1 7,0 7,0 10,0 2,0 2,0 7,0 3,0 7,0 14,0 14,0 20,0 2,0 2,0 14,0 3,0 7,0 Cng theo nhm 11276,0 Tra ph lc PL 1.1 TL1 tm c ksd = 0,15 ; cos = 0,6 ta c n = 12 ; n1 = 9 Trong n*n1 n v P*Pdm1 Pdm v nhq = n . n hq n1 - s thit b c cng sut ln hn mt na cng sut ca thit b c cng sut ln nht trong nhm my. Pm1 - tng cng sut nh mc ca n1 thit b. Pm - tng cng sut nh mc ca n thit b (tc ca ton b nhm). n* = n1 n = 9 12 = 0,75 Thc hin: Trn Huy Tp Lp 1H3 Khoa H Thng in H in Lc= 22 N TT NGHIP THIT K CUNG CP IN CHO NH MY LIN HP DT P* = P1 P = 76, 0 = 0,91 Tra ph lc PL 1.5 TL1 ta tm c nhq* = 0,80 S thit b dng in hiu qu nhq = nhq*.n = 9,6 Tra h lc PL 1.6 TL1 vi ksd = 0,15 v nhq = 9,6 tm c kmax = 2,2 Ph ti tnh ton nhm 1 Cng sut tc dng tnh ton ca ph ti n Ptt = kmax .ksd .Pdmi = 2, 2 .0,15.76, 0 = 25, 08 (kW) i=1 Cng sut phn khng tnh ton ca ph ti Qtt = Ptt . tg = 25,08 . 1,33 = 33,44 (kVAr) Cng sut biu kin tnh ton Stt = Ptt = 25, 08 0, 6 Dng in tnh ton ca nhm IttStt 3.U dm 41,8.103 3.380 A) Dng in nh mc ca thit b I dmiPdmi 3.U dmi .cos dm maxPdm max 3.U dm max .cos10.103 3.380.0, 6 25,32( A) Dng nh nhn ca nhm thit b Ikmax = kmm . Immax (v Pmmaxmm = kk = 5) kmax = 5 . 25,32 = 126,6 (A) n = Ikmax + Itt - ksd . Immax n = 126,6 + 63,51 (0,15 . 25,32) = 186,31 (A). 3.2.2.Tnh ton cho cc nhm cn li ca phn xng sa cha c kh Tnh ton tng t nh nhm 1 cho cc nhm ph ti cn li (t nhm 2-5) ca phn xng. Ta c bng tng kt ph ti in phn xng sa cha c kh Thc hin: Trn Huy Tp Lp 1H3 Khoa H Thng in H in Lc 23 N TT NGHIP THIT K CUNG CP IN CHO NH MY LIN HP DT Bng 2.7 Kt qu phn nhm ph ti ca phn xng sa cha c kh Tn nhm v thit b 1 K hiu trn bn v 2 S lng 3 Pm, kW 4 m = Pdm max Pdm min 5 Ksd 6 Cos/ tg 7 nhq 8 Kmax 9 Itt (A) 10 Ptt, kW 11 Qtt, kVAr 12 Stt, kVA 13 Nhm 1 My tin ren My tin ren My tin ren My tin ren cp chnh xc My doa to My bo ngang My xc My phay vn nng 1 2 3 4 5 6 7 8 2 2 2 1 1 2 1 1 2x7,0 2x7,0 2x10,0 2,0 2,0 2x7,0 3,0 7,0 0,15 0,15 0,15 0,15 0,15 0,15 0,15 0,15 0,6/1,33 0,6/1,33 0,6/1,33 0,6/1,33 0,6/1,33 0,6/1,33 0,6/1,33 0,6/1,33 Cng theo nhm 11276,05,00,150,6/1,339,62,263,5125,0833,3641,80 Nhm 2 My mi trn My mi phng My mi trn My mi vn nng My mi dao ct gt My mi mi khoan My mi sc mi phay My mi dao chut My mi mi khot My mi th 11 12 13 17 18 19 20 21 22 28 2 1 1 1 1 1 1 1 1 1 2x4,0 2,5 2,5 1,5 0,5 1,5 1,0 0,5 2,5 2,5 0,15 0,15 0,15 0,15 0,15 0,15 0,15 0,15 0,15 0,15 0,6/1,33 0,6/1,33 0,6/1,33 0,6/1,33 0,6/1,33 0,6/1,33 0,6/1,33 0,6/1,33 0,6/1,33 0,6/1,33 Cng theo nhm 21123,06,150,150,6/1,339,022,219,227,5910,0912,65 Nhm3 My phay ngang My phay ng My khoan ng 9 10 14 1 2 1 7,0 2x2,5 3,0 0,15 0,15 0,15 0,6/1,33 0,6/1,33 0,6/1,33 Thc hin: Trn Huy Tp Lp 1H3 Khoa H Thng in H in Lc 24 N TT NGHIP THIT K CUNG CP IN CHO NH MY LIN HP DT My khoan ng My ct mp Thit b ho bn kimloi My gia My khoan bn My mi trn 15 16 23 24 25 26 1 1 1 1 2 1 4,5 4,5 1,0 2,5 2x0,5 1,5 0,15 0,15 0,15 0,15 0,15 0,15 0,6/1,33 0,6/1,33 0,6/1,33 0,6/1,33 0,6/1,33 0,6/1,33 Cng theo nhm 31130,0140,150,6/1,337,812,3128,2611,1614,8418,60 Nhm 4 My tin ren My tin ren My tin ren My tin ren My tin ren My khoan hng tm My bo ngang 31 32 33 34 35 37 38 3 1 1 3 1 1 1 3x4,0 7,0 6,0 3x10,0 14,0 4,5 2,5 0,15 0,15 0,15 0,15 0,15 0,15 0,15 0,6/1,33 0,6/1,33 0,6/1,33 0,6/1,33 0,6/1,33 0,6/1,33 0,6/1,33 Cng theo nhm 41176,05,60,150,6/1,338,912,263,5125,0833,3641,80 Nhm 5 My khoan ng My bo ngang My mi ph My khoan bo My bin p hn 36 39 40 42 43 2 1 1 1 1 2x4,5 10,0 4,5 0,5 21,0 0,15 0,15 0,15 0,15 0,15 0,6/1,33 0,6/1,33 0,6/1,33 0,6/1,33 0,6/1,33 Cng theo nhm 5645,0420,150,6/1,334,13,1153,1520,9929,9234,98 Thc hin: Trn Huy Tp Lp 1H3 Khoa H Thng in H in Lc. 22 25 N TT NGHIP THIT K CUNG CP IN CHO NH MY LIN HP DT 3.3. Xc nh ph ti chiu sng ca phn xng sa cha c kh Ph ti chiu sng ca phn xng sa cha c kh xc nh theo phng php sut chiu sng trn mt n v din tch Trong Pcs = po . F po sut chiu sng trn mt n v din tch (W/m2) F Din tch c chiu sng (m2) Trong phn xng SCCK h thng chiu sng s dng n si t. Tra PL 1.7 TL1 ta tm c po = 15 W/m2 Ph ti chiu sng ca phn xng Pcs = po.F = 15 . 2600 = 39,0 (KW) Qcs = Pcs.tgcs = 0 (n si t coscs = 0) 3.4. Xc nh ph ti tnh ton ton phn xng Ph ti tc dng (ng lc) ca ton phn xng 5 Pdl = Kdt .Ptti = 0,85 .(25,08 + 7,59 + 10,40 + 25,08 + 20,99) i=1 = 75,77 ( kW ) Trong Kdt l h s ng thi ca ton phn xng, ly Kdt = 0,85 Ph ti phn khng ca phn xng 5 Qdl = K dt .Qtti = 0,85.( 33,36 + 10,09 + 13,83 + 33,36 + 27,92 ) i=1 = 100,77 ( kVAr ) Ph ti ton phn ca phn xng k c chiu sng Pttpx = Pdlpx + Pcspx = 75,77 + 39,0= 114,77 (kW) Qttpx = Qdlpx = 100,77 (kVAr) Sttpx = Ptt 2 +Qtt 2 = 114,772 +100,772 = 153,86 ( kVA ) Cospx = Pttpx Sttpx = 114, 27 153,86 = 0, 75 4. Xc nh ph ti tnh ton ca cc phn xng khc trong nh my Do ch bit trc cng sut t v din tch ca cc phn xng nn y ta s dng phng php xc nh ph ti tnh ton theo cng sut t v h s nhu cu. 4.1. PHNG PHP XC NH PH TI TNH TON THEO CNG SUT T V H S NHU CU n Ptt = K nc .Pdi i=1 Q tt = Ptt Stt = Ptt + Q tt = Ptt Mt cch gn ng c th ly P = Pm Khi Thc hin: Trn Huy Tp Lp 1H3 Khoa H Thng in H in Lc26 N TT NGHIP THIT K CUNG CP IN CHO NH MY LIN HP DT n Ptt = K nc.Pdmi i=1 Trong - Pi, Pmi cng sut t v cng sut nh mc ca thit b th i (kW) - Ptt, Qtt, Stt cng sut tc dng, phn khng v ton phn tnh ton ca nhm thit b (kW, kVAR, kVA) - n s thit b trong nhm - Knc h s nhu cu ca nhm h tiu th c trng tra trong s tay tra cu 4.2. Xc nh ph ti tnh ton ca cc phn xng Vic tnh ton cho cc phn xng l hon ton ging nhau. Ta tnh mt phn xng mu. Ly phn xng mc lm v d, cc phn xng cn li ta tnh tng t. 4.2.1. Tnh ton cho phn xng mc Phn xng mc c cng sut t 160 kW, din tch 2125 m2; Tra ph lc PL 1.3 TL1 ta c Knc = 0,5 ; cos = 0,7 ; tg = 1,02. y ta dng n si t c coscs =1 ; tgcs = 0 Tra ph lc PL 1.2 TL1 ta c sut chiu sng po = 12 W/m2 Cng sut tc dng v phn khng tnh ton ng lc Pdl = Knc . P = 0,5 . 160 = 80 kW Qdl = Pdl . tg = 80 .1,02 = 81,6kVAr Cng sut tc dng v phn khng tnh ton chiu sng Pcs = po . F = 1 . 2125 = 25,5 kW Qcs = Pcs . tgcs = 105 . 0 = 0 kVAr Cng sut tnh ton ca phn xng Cng sut tc dng Ptt = Pdl + Pcs = 80 + 25,5 = 105,5 kW Cng sut phn khng Qtt = Qdl + Qcs = 81,6 + 0 =81,6 kVAr Cng sut biu kin Stt =Ptt 2 +Qtt 2 = 105,52 +81,62 = 133,37 (kVA) Pttpx Sttpx = 105,5 133,37 = 0,79 Tnh ton tng t cho cc phn xng cn li. Ring i vi phn xng si, xng nhum, xng l v khu nh vn phng (ban qun l v phng th nghim) ta chn n hunh quang c coscs =0,85 ; tgcs = 0,62 cn li (trm bm v kho vt liu trung tm) ta dng n si t c coscs = 1; tgcs = 0. Ta c bng tng kt sau y Thc hin: Trn Huy Tp Lp 1H3 Khoa H Thng in H in Lc 27 N TT NGHIP THIT K CUNG CP IN CHO NH MY LIN HP DT Bng 2.8 - Kt qu tnh ton ph ti cc phn xng ca nh my lin hp dt STT ` 1 2 3 4 5 6 7 8 9 Tn Phn xng B phn si B phn dt B phn nhum Phn xng l Phn xng sa cha c kh Phn xng mc Trm bm Ban qun l v PTN Kho vt liu trung tm P (kW) 1500 2800 350 300 250 160 120 150 50 Knc/Kt 0,65 0,85 0,7 0,6 0,85 0,5 0,6 0,7 0,6 Cos/ tg 0,75/0,88 0,7/1,02 0,8/0,75 0,7/1,02 0,6/1,33 0,7/1,02 0,7/1,02 0,8/0,75 0,7/1,02 F (m2) 3600 3600 2800 2000 2700 2125 1350 2500 2000 Po (W/m2) 15 16 12 15 15 12 12 15 10 Pdl (kW) 975,0 2039,88 245,0 180,0 75,77 80,0 72,0 105,0 30,0 Pcs (kW) 54,0 57,6 33,6 30,0 40,5 25,5 16,2 37,5 20,0 Ptt (kW) 1029,0 2097,48 287,6 210,0 116,27 105,5 88,2 142,5 50,0 Qtt (kVAr) 891,48 2116,37 204,54 202,2 100,77 81,6 73,44 102,0 30,6 Stt, (kVA) 1361,46 2979,67 352,94 291,52 153,86 133,37 114,77 175,24 58,62 Costtpx 0,76 0,7 0,81 0,72 0,76 0,79 0,77 0,81 0,85 Tng4126,553803,05621,45 Thc hin: Trn Huy Tp Lp 1H3 Khoa H Thng in H in Lc;; i 28 N TT NGHIP THIT K CUNG CP IN CHO NH MY LIN HP DT 5. Xc nh ph ti tnh ton cho ton nh my Ph ti tnh ton tc dng ca ton nh my Pttnm = Kdt . 9 Pttpxi iTrong Kdt h s ng thi ly bng 0,85 Pttpxi ph ti tnh ton ca cc phn xng d xc nh c trn Pttnm = 0,85 . 4126,55 = 3507,57 (kW) Ph ti tnh ton phn khng ca ton nh my Qttnm = Kdt9 Q i=1 ttpxi = 0,85 . 3803,0 = 3232,55 (kVAr) Ph ti tnh ton ton phn ca ton nh my Sttnm = Pttnm2 + Qttnm2 = 3507,572 +3232,552 = 4769,95 (kVA) H s cng sut ca ton nh my cosnm = Pttnm Sttnm = 3507,57 4769,95 = 0,74 6. Biu ph ti ca cc phn xng trong nh my 6.1.Tm ph ti in Tm ph ti in l im thho mn iu kin momen ph ti t gi tr cc tiu n X ili i Min Trong Pi v li l cng sut v khong cch ca ph ti th I n tm ph ti xc nh to ca tm ph ti c th s dng cc biu thc sau x o = n x iSi i=1 n Si i=1 yo = n ySi i=1 n Si i=1 z o = n ziSi i=1 n Si i=1 Trong xo; yo ; zo to ca tm ph ti in xi ; yi ; zi to ca ph ti th I tnh theo mt h trc to XYZ tu chn Si cng sut ca phti th i Trong thc t thng t quan tm n to z. Tm ph ti in l v tr tt nht t cc trm bin p, trm phn phi, t ng lc nhm mc ch tit kim chi ph cho dy dn v gim tn tht trn li in.. 6.2.Biu ph ti in Biu ph ti in l mt vng trn v trn mt phng, c tm trng vi tm ca ph ti in, c din tch tng ng vi cng sut ca ph ti theo t l xch no tu chn. Biu ph ti in cho php ngi thit k hnh dung c s phn b ph ti trong phm vi khu vc cn thit k, t c c s lp cc phng n cung cp in. Thc hin: Trn Huy Tp Lp 1H3 Khoa H Thng in H in Lc 6 29 N TT NGHIP THIT K CUNG CP IN CHO NH MY LIN HP DT Biu ph ti in dc chia thnh hai phn Phn ph ti ng lc (phn hnh qut gch cho) v phn ph ti chiu sng (phn hnh qut trng). v dc biu ph ti cho cc phn xng, ta coi ph ti ca cc phn xng phn b u theo din tch phn xng nn tm ph ti c th ly trng vi tm hnh hc ca phn xng trn mt bng. Bn knh vng trn biu ph ti ca ph ti th i c xc nh qua biu thc R i = Si Trong m l t l xch, y chn m = 3 kVA/ mm2 Gc ca ph ti chiu sng nm trong biu dc xc nh theo cng thc sau cs360.Pcs Ptt Kt qu tnh ton Ri v csi ca biu ph ti cc phn xng c ghi trong bng sau Bng 2.8- Bn knh R v gc chiu sng ca biu ph ti cc phn xng STT Tn phn xng Pcs, kW Ptt, kWStt,,kVA Tm ph ti x, y, mm mm R,mm cso 1 B phn si54,01029,01361,4623,059,012,0218,89 2 B phn dt57,62097,482979,6738,059,017,78 9,89 3 B phn nhum 4 Phn xng l 33,6 30,0 287,6 210,0 352,94 291,52 76,5 59,0 87,0 59,0 6,12 42,06 4,83 51,43 5 Phn xng SCCK40,5116,27153,86102,042,04,04125,40 Phn xng mc 7 Trm bm 8 Ban qun l v PTN 9 Kho vt liu trung tm 25,5 16,2 37,5 20,0 105,5 88,2 142,5 50,0 133,37 114,77 175,24 58,62 95,0 23,5 81,0 10,0 58,0 39,5 15,0 19,0 3,76 87,01 3,49 66,12 4,31 94,74 2,49 144,0 Thc hin: Trn Huy Tp Lp 1H3 Khoa H Thng in H in Lc 30 N TT NGHIP THIT K CUNG CP IN CHO NH MY LIN HP DT Biu ph ti ca ton nh my O Thc hin: Trn Huy Tp Lp 1H3 Khoa H Thng in H in Lc31 N TT NGHIP THIT K CUNG CP IN CHO NH MY LIN HP DT CHNG 3 THIT K H THNG CUNG CP IN LA CHN CP IN P TRUYN TI T HT V NH MY I. KHI NIM MNG IN CAO P NH MY Mng cao p nhn in t HT n my bin p ngun cung cp cho cc nh my Thit k ng trn quan im ca nh cp in, ch xt chi ph vn u t phm vi cc nh my 1. Chn cp in p vn hnh Cp in p vn hnh l cp in p lin kt h thng cung cp in ca nh my vi H thng in. Cp in p vn hnh ph thuc vo cng sut truyn ti v khong cch truyn ti theo mt quan h kh phc tp. Vic xc nh in p truyn ti t h thng v x nghip lin quan n rt nhiu vn kinh t v k thut ca HTCC. Nh vic chn s cc phng n CC, tnh tng vn u t v cc chi ph v tn tht in nng, chi ph vn hnh v.v Tt nhin vic tnh ton ch c ngha khi chng ta gi thit rng ngun ca h thng c cng sut v cng ln v c kh nng cung cp vi tt c cc cp truyn ti ca h thng. Cng thc kinh nghim chn cp in p truyn ti Trong tnh ton in p truyn ti thng thng ngi ta hay s dng mt s cng thc thc nghim sau U = 4,34. l + 0, 016.P ( kV ) . U = 17. l 0, 016 P U = 16. 4 P.l Trong U - in p truyn ti (kV) P - Cng sut cn truyn ti (tnh ton) ca nh my (kW) l - Khong cch ti (t trm bin p trung gian v nh my) (km) Nh vy cp in p hp l truyn ti in nng v nh my s l Ph ti tnh ton ca nh my c k n s pht trin ca ph ti trong tng lai. Trong St = S0(1+t) St - Ph ti tnh ton d bo ti thi dim sau t nm S0 - ph ti tnh ton xc nh ti thi im ban u. t - s nm d bo, ly t = 15 nm - h s gia tng ca ph ti, ly = 0,05 Ta c Pt = P0 . (1 + . t) = 3507,57 . (1 + 0,05 . 15) = 6138,25 kW Qt = Q0. (1 + . t) = 3232,55 . (1 + 0,05 . 15) = 5656,96 kVAr St = S0 . (1 + . t) = 4769,95. (1 + 0,05 . 10) = 8347,41 kVA 2. Cp in p truyn ti t HT v nh my Cp in p vn hnh xc nh theo cng thc kinh nghim. Thc hin: Trn Huy Tp Lp 1H3 Khoa H Thng in H in Lc+ + 32 N TT NGHIP THIT K CUNG CP IN CHO NH MY LIN HP DT U = 4,34 . l + 0,016 .P = 4,34 . 16 + 0,016 .6138, 25 = 46,38 ( kV ) Ngun in cp cho nh my l ngun trung p. Do , t kt qu tnh ton ta chn cp in p 35 kV lin kt t h thng in ti nh my II. LA CHN S L NG DUNG LNG V V TR T TBA CHNH (TRM PHN PHI TRUNG TM) 1. Chn s lng v dung lng MBA 1.1.Tm ph ti in ca nh my Tm ph ti in l im tho mn iu kin momen ph ti t gi tr cc tiu n X ili i Min Trong Pi v li l cng sut v khong cch ca ph ti th i n tm ph ti xc nh to ca tm ph ti c th s dng cc biu thc sau x o = n x iSi i=1 n Si i=1 ; yo = n yiSi i=1 n Si i=1 ; zo = n ziSi i=1 n Si i=1 Trong xo; yo ; zo - to ca tm ph ti in xi ; yi ; zi - to ca ph ti th i tnh theo mt h trc to OXYZ tu chn Si - cng sut ca phti th i n - s ph ti in. Trong thc t thng t quan tm n to z. Tm ph ti in l v tr tt nht t cc trm bin p, trm phn phi, t ng lc nhm mc ch tit kim chi ph cho dy dn v gim tn tht trn li in. Ta c c tm ph ti in ca nh my lin hp dt xo 102.153,86 5621, 45 62 5621, 45 yo 5621, 45 5621, 45 Tm ph ti ca nh my lin hp dt l Mo(xo;yo) = Mo(43,69 ; 55,68) Thc hin: Trn Huy Tp Lp 1H3 Khoa H Thng in H in Lc8347,41 Vy: 33 N TT NGHIP THIT K CUNG CP IN CHO NH MY LIN HP DT 1.2.Dung lng v s lng MBA cho trm PPTT ca nh my Cc phn xng trong nh my c xp vo h loi I vi ph ti tnh ton ca c nh my c k n s pht trin trong 15 nm ti l: SttCN(0)= 4769,95 kVA. SttCN(15) = 8347,41 kVA V vy trm bin p trung tm c t 2 my bin p v chn my bin p ca Vit nam sn xut nn khng cn hiu chnh theo nhit (khc=1). Xt trng hp mt my bin p b s c my bin p cn li c kh nng chy qu ti trong thi gian ngn. Trong trng hp ny cng sut my bin p c xc nh theo cng thc sau: - Ch bnh thng:SmBA , Stt k hc .N B kVA - Ch s c: SmBA Sttsc k hc .k qt .(N B -1) , kVA Trong : -Sttsc l cng sut m ph ti cn ti khi s c tc b s c 1 my (Stt = Sttsc= SttCN(10)). -kqt l h s qu ti (kqt=1,4). -NB l s lng MBA trong trm (NB=2). SmBA kVA 1.2 Kim tra theo iu kin qu ti: SmBA 8347,41 1.1,4.(2-1) kVA Tra bng bng 19 ( Mng li in ca Nguyn Vn m ) ta chn c loi my bin p 3 pha 3 cun dy do Vit nam ch to nhn hiu TDTH-10000/35 cho c 3 cp in p trung p 35kV, 10,5kV, 6,3kV ch to theo n t hng thng s nh sau Tn trm TBATT TDTH-10000/35 Sdm [kVA] 6300 Uc//Uh[kV] 38,5/10,5 0 [kW] 9,0 n [kW] 46,5 Un [%] 7,5 I0 [%] 0,9 Vy MBA chn tha mn 2. La chn s lng, dung lng v v tr t TBA cc phn xng, lp s CC cho nh my 2.1.t vn Vic la chn s cung cp in nh hng rt ln n cc ch tiu kinh t v k thut ca h thng. Mt s cung cp in c coi l hp l phi tha mn cc yu cu c bn sau 1. m bo cc ch tiu k thut. 2. m bo tin cy cung cp in. 3. Thun tin v linh hot trong vn hnh. 4. An ton cho ngi v thit b. 5. D dng pht trin p ng nhu cu tng trng ca ph ti trong tng lai. Thc hin: Trn Huy Tp Lp 1H3 Khoa H Thng in H in Lc34 N TT NGHIP THIT K CUNG CP IN CHO NH MY LIN HP DT 6. m bo cc ch tiu v mt kinh t. Trnh t tnh ton thit k mng cao p cho nh my bao gm cc bc - Vch phng n cung cp in. - La chn v tr, s lng, dung lng ca cc trm bin pv la chn tit din cc ng dy cho cc phng n. - Tnh ton kinh t k thut la chn phng n hp l. - Thit k chi tit cho phng n c chn. 2.2.Vch cc phng n cung cp in Theo tnh ton th cp in p truyn ti t trm bin p phn phi trung tm ca nh my v cc phn xung l 10 KV. 2.2.1.Phng n v cc TBA phn xng Cc trm bin p phn xng c la chn trn nguyn tc sau - V tr t trm phi tha mn yu cu gn tm ph ti; thun tin cho vic vn chuyn, lp t, vn hnh, sa cha my bin p an ton kinh t. - S lng my bin p (MBA) t trong cc cc TBA phi c la chn cn c vo yu cu cung cp in ca ph ti; iu kin vn chuyn v lp t, ch lm vic ca ph ti. Cc h h ti loi v ch nn t hai MBA, cc h ph ti loi th ch nn t mt MBA. Dung lng cc MBA c chn theo iu kin n.khc.SdmB Stt V kim tra theo iu kin qu ti s c Trong (n- 1) . khc . kqt . SdmB Sttsc n - s my bin p c trong trm bin p khc - h s hiu chnh theo nhit mi trng, ta chn loi my bin p ch to ti Vit Nam nn khng cn hiu chnh nhit , khc = 1. kqt - h s qu ti s c, kqt = 1,4 nu tha mn iu kin MBA vn hnh qu ti khng qu 5 ngy m. Thi gian qu ti trong mt ngy m khng vt qu 6h, trc khi qu ti MBA vn hnh vi h s ti 0,93. Sttsc cng sut tnh ton s c. Khi s c mt MBA c th loi b mt s ph ti khng quan trng gim nh c vn u t v tn tht ca trm trong trng hp vn hnh bnh thng. Gi thit trong cc h loi c 30% l ph ti loi nn Sttsc = 0,7. Stt ng thi cng cn hn ch chng loi MBA dng trong nh my to iu kin thun tin cho vic mua sm, lp t, thay th, vn hnh, sa cha v kin tra nh k. Cn c vo ln, s phn b ph ti ca nh my ta t 5 TBA phn xng trong Trm B1 cung cp cho ph ti ca phn xng si. Trm B2 cung cp cho ph ti ca phn xng dt. Trm B3 cung cp cho ph ti ca phn xng nhum v ban qun l v phng th nghim. Trm B4 cung cp cho ph ti ca phn xng l v phn xng sa cha c kh. Trm B5 cung cp cho ph ti ca phn xng mc, trm bm v kho vt liu trung tm. Thc hin: Trn Huy Tp Lp 1H3 Khoa H Thng in H in Lc35 N TT NGHIP THIT K CUNG CP IN CHO NH MY LIN HP DT 2.2.2.Chn cc mba phn xng Trm bin p B1 iu kin chn MBA n . khc . SdmB Stt = 1616,63 KVA SdmB 1420, 08 2 = 710,04 (kVA) Chn MBA tiu chun c SdmB = 1000 kVA Kim tra li theo iu kin qu ti s c (n.-1) . khc . kqtsc . SdmB SttSC = 0,7 . Stt SdmB 0, 7.1420, 08 1, 4 = 710,04 kVA Nh vy MBA chn tha mn cc iu kin. Trm B1 ta t 2 MBA c SdmB = 1000 kVA Tnh ton tng t cho cc trm cn li ta c kt qu chn MBA nh sau. Tnh ton tng t ta c kt qu chn MBA cho cc TBA phn xng nh sau Bng 3.1- Kt qu chn MBA cho cc trm bin p phn xng Trm B1 S lng MBA 2 Stt (KVA) 1420,08 SttB (KVA) 710,04 Ssc (KVA) (n-1).kh.kqtsc.Sdm (kVA) SdmB (KVA) 1000 B222979,671489,841600 B3 B4 2 2 528,18 445,38 264,09 222,69 315 315 B51248,14248,14--315 2.3.Xc nh v tr cc TBA phn xng Trong cc trm nh my thng s dng cc kiu trm bin p phn xng. Cc trm bin p cung cp cho mt phn xng c th dng loi lin k c mt tng ca trm chung vi tng ca phn xng nh vy tit kim c vn xy dng v t nh hng n cc cng trnh khc. Trm lng cng c s dng cung cp in cho mt phn hoc ton b mt phn xng v c chi ph u t thp, vn hnh bo qun thn li song v mt an ton khi c s c trong trm khng cao. Cc trm bin p dng chung cho nhiu phn xng nn t gn tm ph ti, nh vy c th a in p cao ti gn h tiu th in v rt ngn kh nhiu chiu di mng phn phi cao p ca x nghip cng nh mng h p phn xng, gim chi ph kim loi mu v gim tn tht. Cng v vy nn dng trm c lp tuy nhin vn u t xy dng trm s gia tng. Ty thuc vo iu kin c th c th la chn mt trong c loi trm bin p nu. m bo an ton cho ngi cng nh thit b, m bo m quan cng nghip y s dng loi trm xy t gn tm ph ti, gn cc trc giao thng trong nh my, song cng cn phi tnh n kh nng pht trin v m rng sn xut. Thc hin: Trn Huy Tp Lp 1H3 Khoa H Thng in H in Lci 36 N TT NGHIP THIT K CUNG CP IN CHO NH MY LIN HP DT la chn c v tr t cc TBA phn xng cn xc nh tm ph ti ca cc cc phn xng hay nhm phn xng c cung cp in t cc TBA . Xc nh v tr t trm bin p B1 (phng n 1) cung cp in cho ph ti ca phn xng git l ng gi v ph ti ca phn xng sa cha c kh x o = yo = n x iSi i=1 n Si i=1 n ySi i=1 n Si i=1 62.15 Chn v tr thc ca trm B1 l (22,68 ; 57,35) Cn c vo v tr ca nh xng v tnh ton tng t ta xc nh c v tr ca cc trm bin p phn xng nh sau. Bng 3.2 - Kt qu xc nh v tr t trm bin p phn xng Tn Trm B1 B2 B3 B4 B5 Xoi 22,68 38,0 70,36 92,18 88,52 V tr t Yoi 57,35 59,0 52,53 53,12 17,26 3. Phng n cung cp in cho cc trm bin p phn xng 3.1.Phn loi cc h dng in trong nh my 3.1.1.Nguyn tc chung Cc h dng in trong nh my cn phi c phn loi theo mc tin cy CC. Vic phn loi thng c nh gi t cc ph ti, nhm ph ti, phn xung v ton b nh my. Cn c vo tnh cht cng vic, vai tr ca chng trong dy truyn cng ngh chnh ca nh my, vo mc thit hi kinh t ca chng khi khng c CC, hoc mc nguy him c e do ti tai nn lao ng khi ngng CC. V vy, cn phi nh gi c chng thuc h tiu th loi no (h loi I ; II hay h loi III). iu ny c ngha quan trng cho vic chn s v phng n CC, nhm t c cht lng in nng cung cp theo yu cu ca cc ph ti. 3.1.2.Phn loi cc h dng in trong nh my Cn c vo tnh hnh ca cc phn xng trong nh my, t tm ra cc ph ti, nhm ph ti hoc c phn xng c yu cu c bit v tnh lin tc CC, t s b nh gi c phn xng thuc h tiu th loi no. Ngoi ra, cn phi phn c t Thc hin: Trn Huy Tp Lp 1H3 Khoa H Thng in H in Lc37 N TT NGHIP THIT K CUNG CP IN CHO NH MY LIN HP DT l % ca nhng ph ti khng c php ngng CC (ph ti loi I). V mt phn xng hay mt nh my c phn vo h tiu th loi I cng cha hn c 100% ph ti khng dc php ngng CC. 3.2.Cc kiu s CC ph hp vi in p truyn ti chn C nhiu loi s CC t HT ti nh my, vic la chn s ph thuc vo cc yu t nh in p truyn ti, h tiu th in, cc cp in p c CC. Nh my c hay khng nh my in t dng. S CC cho nh my (s CC bn ngoi nh my) c chia lm 2 loi chnh S vi nh my c nh my in t dng. S vi nh my khng c nh my in t dng. 3.3.Phn tch v chn kiu s ph hp trn ta chn c s ph hp vi nh my. Tuy nhin, c c s ti u ta cn phi tin hnh chn cc v tr t TBA v cc phng n ni dy. 3.3.1.Chn v tr trm PPTT ca nh my V tr t cc TBA hay cc trm PPTT c ngha trong vic lp t, vn hnh cng nh cc yu t v kinh t v an ton trong vn hnh. Do , v tr ca cc trm phi c chn theo cc nguyn tc c bn sau V tr trm phi t gn tm ph ti. V tr trm cn phi c t ni thun tin cho vic lp t, vn hnh cng nh thay th v tu sa sau ny. V tr trm khng lm nh hng n giao thng v vn chuyn vt t chnh ca nh my. V tr trm cn phi thun tin cho vic lm mt t nhin, c kh nng phng chy n, ng thi trnh b s n mn ca cc loi ho cht ca nh my gy ra. Nh vy, vic chn v tr cc trm phi da trn mt bng cng ngh ca nh my, v tr v hng gi ca nh my trong mt bng tng th ca khu vc. 3.3.2.Cc phng n ni dy chi tit Sau khi chn c cc v tr t TBA, ta tin hnh la chn cc phng n ni dy (t TBA chnh hoc t tram phn phi v cc TBA phn xng). Cc s ni dy phi c th hin trn bn v mt bng nh my c ch n cc iu kin kh thi cc tuen dy. Cc tuyn dy vch ra phi ph hp vi cc kiu s trn v ph hp vi cc yu cu ring ca tng loi h ph ti. Nh vy, y c th ch cng mt cch b tr cc trm cng c th a ra c nhiu phng n ni dy khc nhau. Thc hin: Trn Huy Tp Lp 1H3 Khoa H Thng in H in Lc 38 N TT NGHIP THIT K CUNG CP IN CHO NH MY LIN HP DT 3.4.Cc phng n CC cho cc TBA phn xng Hnh 4.1 Cc kiu s cung cp in H thng ~ 6 20 kV H thng ~ 35 - 110 kV Trm 1 Trm 2 Trm 3 Trm 4 a) H thng ~ 35 - 220 kV b) H thng ~ 35 - 220 kV c) 6 - 20 kV 6 - 20 kV d) 20 - 35 kV Thc hin: Trn Huy Tp Lp 1H3 Khoa H Thng in H in Lc39 N TT NGHIP THIT K CUNG CP IN CHO NH MY LIN HP DT 3.4.1.Kiu s c TBA trung tm (H-a) Vi loi s ny th in ly t h thng (in p 35 kV) vo trm bin p trung tm t trng tm (hoc gn trng tm) ca nh my v c bin i xung cp in p nh hn l 10 kV hoc 6 kV tip tc a n cc trm bin p phn xng. u im ca s - C tin cy cp in kh cao - Chi ph cho cc thit b khng ln (gim vn u t cho mng in cao p trong nh my cng nh cc trm bin p phn xng) - Vn hnh thun li. Nhc im ca s - S lng ca thit b s nhiu do lp t trm bin p trung tm. - u t xy dng trm bin p trung tm. - Gia tng tn tht trong mng cao p ca Nh My. ng c p dng trong cc trng hp nh my c cc phn xng t tng i gn nhau v xa h thng. 3.4.2.Kiu s khng c trm PPTT(s dn su H-b) Vi loi s ny th in c ly t h thng v n tn trm bin p phn xng sau s h cp xung 0,4 kV dng trong cc phn xng u im ca s - Gim - Nng cao nng lc truyn ti ca li Nhc im ca s - tin cy cung cp in khng cao, mun nng tin cy cung cp in th phi tn km nhiu kinh ph - Cc thit b s dng trong s gi thnh t v yu cu trnh vn hnh phi cao. ny p dng cho cc nh my c cc phn xng c cng sut ln v c b tr tng i tp trung nn y ta khng xt n phng n ny. 3.4.3.Kiu s s dng trm PPTT(H-c,d) Vi loi s ny th in c ly t h thng cung cp cho cc trm bin p phn xng thng qua TPPTT. Ti trm bin p phn xng in p c h cp xung 0,4 kV dng cho cc thit b trong phn xng. u im ca s - Gim - Vic qun l, vn hnh mng in cao p ca nh my c thun li. - tin cy cung cp in c m bo. Nhc im ca s - u t cho mng cao p kh ln. - Cc thit b s dng trong s gi thnh t v yu cu trnh vn hnh phi cao. ng p dng cho cc nh my c cc phn xng cng sut ln v khi in p ngun khng cao. Thc hin: Trn Huy Tp Lp 1H3 Khoa H Thng in H in Lc NG N I PHNG N II 40 N TT NGHIP THIT K CUNG CP IN CHO NH MY LIN HP DT 3.5.S xc nh v tr t trm BATG, trm PPTT v cc TBA phn xng ca nh my PHPHNG N 1 TBATG PHNG N 2 TBATG Thc hin: Trn Huy Tp Lp 1H3 Khoa H Thng in H in Lc NG N III 41 N TT NGHIP PHPHNG N 3 THIT K CUNG CP IN CHO NH MY LIN HP DT TPPTT PHNG N IV PHNG N 4 TPPTT Thc hin: Trn Huy Tp Lp 1H3 Khoa H Thng in H in Lc42 N TT NGHIP THIT K CUNG CP IN CHO NH MY LIN HP DT 4. Thit k HTCC cho nh my 4.1.Chn dy dn t trm BATT ca khu cng nghip v trm PPTT ca nh my dt V nh my thuc h loi I, nn s dng ung dy trn khng l kp dn in t TBA trung gian v trm PPTT ca nh my. m bo m quan v an ton, mng cao p trong nh my s dng cp ngm. T trm PPTT n cc TBA ca cc phn xng (cc TBA B1, B2, B3, B4) ta s dng cp l kp, n TBA B5 dng cp l n. Cn c vo v tr cc TBA v cc trm PPTT trn mt bng, ta a ra 2 phung n i dy mng cao p Phng n 1 cc TBA c cp in trc tip t trm PPTT. Phng n 2 cc TBA xa trm PPTT uc ly in thng qua cc TBA gn trm PPTT (nh cc phng n trn hnh v trn). ng dy dn t trm bin p trung tm ca khu cng ngip v trm phn phi trung tm c chiu di 16 Km, ta chn dy 2AC-70. 4.2.Chn cp cao p v cp h p ca nh my 4.2.1.Chn cp cao p ca nh my Theo tnh ton trn ta chn c MBA cho trm PPTT ca nh my l MBA TDTH- 10000/35. Do : 4.2.1.1. Chn thit din dy dn ng dy cung cp t trm bin p trung tm ca khu cng nghip v ti nh my s dng ng dy trn khng, l kp, dy nhm li thp. Trong mt s trng hp ta c th dng nhiu xut tuyn t TBATT ti nh my. Nh my c Tmax ln nn dy dn s c chn theo iu kin mt dng kinh t Jkt (tra theo bng 4.1 trang143 TL5) Khi mt dng kinh t Jkt ca cc nh my c chn bng 2.1. i vi mng in khu vc tit din dy dn c chn theo mt kinh t ca dng in ngha l Fkt = Dng in lm vic chy trong dy. Imax jkt Imax = Sttnm n. 3.Udm (A) Trong n - s mch ng dy Udm - in p nh mc mng in, kV Stt nm y ly theo ph ti d bo Vi li trung p do khong cch ti in xa tn tht in p ln v th ta phi kim tra theo iu kin tn tht cho php btcp= 5% . Udm sccp = 10% . Udm 4.2.1.2.Vi cp in p trung p UTA = 35 KV - Dng in tnh ton chy trn mi dy dn Thc hin: Trn Huy Tp Lp 1H3 Khoa H Thng in H in Lc= = 43 N TT NGHIP THIT K CUNG CP IN CHO NH MY LIN HP DT Ilvmax = - Tit din kinh t SttNM18374,41 n. 3.Udm2. 3.35 = 69,07(A) Ftt = Ilvmax 69, 07 J kt1,1 = 62,79(mm2 ) Chn dy nhm li thp tit din 70 mm2. Tra bng 2 sch li in 1 dy dn AC-70 c Icp = 265A. - Kim tra dy dn khi s c t 1 dy Isc=2 . Ilvmax = 2 . 75,18 = 150,36 A < Icp = 265A Vy dy dn chn tha mn iu kin pht nng khi s c. - Kim tra dy theo iu kin tn tht in p Vi dy AC-70 c khong cch trung bnh hnh hc l Dtb=2m, vi cc thng s k thut r00 P.R+Q.X U% = ttNM2 ttNM .100 U dm 7572,84 .0,45.16+5072,16.0,42.16 = .100 1000.2.352 cp% = 5 % Dy dn chn tha mn iu kin tn tht in p cho php. PttNM, QttNM tnh theo n v MW v MVAr Vy chn dy AC-70. 4.2.2.Chn cp h p ca nh my Cp t trm bin p B2 ti phn xng 2 Imax = Sttpx 3.Udm = 2979, 67 3.0,38 = 4512,14(A) Ch c 1 cp i trong rnh nn k2 = 1. iu kin chn cp Icp Imax Tra PL4.28 TL1 chn cp ng h p 3 li + trung tnh cch in PVC do hng LENS ch to tit din 370+50 mm2 vi Icp = 246 A. Tng t cho cc tuyn cp h p khc ta c bng kt qu chn cp Bng 3.3 - Tng hp kt qu chn cp cho nh my NG CP B1 9 B5 7 B3 8 B4 5 F (mm2) 3*95+50 3*50+35 3*50+35 3*70+50 L (m) 90 23 61 34 Icp, A 298 192 192 246 k1.k2kIcp, A 298 192 192 246 Icb, A 248.94 135.45 52.95 202.71 Thc hin: Trn Huy Tp Lp 1H3 Khoa H Thng in H in Lc44 N TT NGHIP THIT K CUNG CP IN CHO NH MY LIN HP DT CHNG 4 TNH TON THIT K CHN CC PHN T C BN CHO CC TBA CUNG CP IN I. TNH TON KINH T - K THUT V LA CHN CC PHN T C BN CHO TBA CC PHNG N. T CHN PHNG N CC TI U CHO NH MY 1. so snh kinh t k thut gia cc phng n ta s dng hm chi ph vng i cho bi ton Trong Cv =V+Cvh - V l tng vn u t bao gm cc vn u t v + ng dy (ch yu xt pha cao p ca nh my + Trm bin p + My ct - Cvh l chi ph vn hnh hng nm c tnh theo biu thc Cvh= Cbd+Ckh+CE+Cm+Cnc+Cph + Cbd chi ph v tu sa bo dng Cbq = kbq.V vi kbq h s bo qun + Ckh chi ph v khu hao Ckh= kkh.V vi kkh l h s khu hao + CE chi ph tn tht v in CE = CP+CA=P A P; A l gi 1kW.ng; 1kWh.ng + Cm tn tht kinh t do mt in + Cnc chi ph v lng cn b v nhn cng vn hnh + Cph chi ph ph khc nh lm mt, si m Trong khi thit k c th gi thit Cbd; Ckh; Cnc; Cph; Cm l nh nhau trong cc phng n nn c th b qua. Cp ch xt khi ph ti rt ln trong trng hp ny ta cng b qua. T Vy Cv = V + CA = V+j=1CAj (1+i) j =V+CA0 .(P/A,i,T) = V+CA0. (1 + i)T -1 i.(1 + i)T Trong - CA0 chi ph v tn tht in nng nm 0. CA0A ly A=1000 /kWh. - i sut trit khu (i=12%). - T thi gian vn hnh ca cng trnh (T=30 nm). - j nm vn hnh ca cng trnh. Thc hin: Trn Huy Tp Lp 1H3 Khoa H Thng in H in Lc NG N I 6 n 45 N TT NGHIP THIT K CUNG CP IN CHO NH MY LIN HP DT 2. Phng n 1 Phng n 1 s dng trm bin p trung gian (TBATG) nhn in 35 kV t h thng v, h xung in p 10 kV sau cung cp cho cc trm bin p phn xng. Cc trm bin p phn xng h t cp 10 kV xung 0,4 kV cp in cho cc ph ti trong phn xng. Hnh 4.1- S phng n 1 PHPHNG N 1 TBATG 2.1.Chn MBA phn xng v xc nh tn tht in nng trong cc TBA Chn MBA phn xng Trn c s chn c cng sut MBA trn, tra bng 12 (mng lui in ca Nguyn Vn m) ta c bng kt qu chn MBA cho cc trm bin p phn xng Bng 4.1 Cc thng s ca my bin p trong phng n 1 Tn TBA Sdm (kVA) UC/UH POPN (kV) (kW) (kW) UN (%) IO SGi (%) lng (106) Thnh tin (106 ) TBATG B1 B2 6300 1000 1600 35/10 10/0,4 10/0,4 9,0 2,5 3,5 46,5 12,2 18,0 7,5 6,5 6,5 0,9 1,5 1,4 2 2 2 405 206 240 810 412 480 B3 B4 B5 315 315 315 10/0,4 0,72 10/0,4 0,72 10/0,4 0,72 4,85 4,85 4,85 4,5 4,5 4,5 6,0 6,0 6,0 2 2 1 76 76 76 152 152 76 Tng vn u t cho TBA VB = 2028,0 10 Cc MBA c sn xut theo n t hng ti cng ty thit b in ng Anh nn khng cn phi hiu chnh nhit . Xc nh tn tht in nng trong cc TBA 2 A = n .Po . t + .PN ttdmB Thc hin: Trn Huy Tp Lp 1H3 Khoa H Thng in H in Lc.46, 5. | .1225, 31= 207693, 97 kWh 1 2 46 N TT NGHIP THIT K CUNG CP IN CHO NH MY LIN HP DT Trong n - s MBA lm vic song song. t - thi gian MBA vn hnh, vi MBA vn hnh sut nm t = 8760 h - thi gian tn tht cng sut ln nht,vi nh my dt c Tmax = 2500 h 4.Tmax)2.8760 = 1225,31 h Po, PN - tn tht cng sut khng ti v tn tht cng sut ngn mch trong MBA. Stt - cng sut tnh ton ca trm bin p. SdmB - cng sut nh mc ca MBA. Tnh tn tht in nng cho trm bin p trung gian Stt = 8374,41 kVA SdmB = 6300 kVA Po = 9,0 kW PN = 46,5 kW Ta c A = 2 . 9 . 8760 + 2 Tnh ton tng t cho cc TBA khc, kt qu tnh ton cho trong bng sau Bng 4.2 - Kt qu tnh ton tn tht in nng trong cc TBA phng n 1 TN TBA S MY STT(kVA) SM O N TBATG B1 B2 B3 B4 B5 2 2 2 2 2 1 8347,41 1420,08 2979,67 528,18 445,38 248,14 6300 1000 1600 315 315 315 9,0 2,5 3,5 0,72 0,72 0,72 46,5 12,2 18,0 4,85 4,85 4,85 208108,37 58873,06 99565,90 20968,52 18554,56 9994,94 Tng tn tht in nng trong cc trm bin pAB = 416065,017 kWh 2.2.Chn dy dn v xc nh tn tht cng sut v tn tht in nng trong mng in Chn cp t TBATG v cc TBA phn xng Cp cao p c chn theo mt kinh t ca dng in Jkt. i vi nh my lin hp dt c Tmax = 2500 h.s dng cp li ng, tra bng 2.10 TL1 tm c Jkt = 3,1 A/mm2. Tit din kinh t ca cp Fkt = I max J kt mm2 Dng in lm vic cc i qua mt si cp Imax = Sttpx n. 3.Udm A Trong n - s l cp Thc hin: Trn Huy Tp Lp 1H3 Khoa H Thng in H in Lc= 47 N TT NGHIP THIT K CUNG CP IN CHO NH MY LIN HP DT Da vo tr s Fkt tnh c, tra bng la chn tit din tiu chun cp gn nht. Kim tra tit din chn theo iu kin pht nng Trong khc . Icp Isc Isc dng in qua cp khi s c t 1 dy. Isc = 2. Imax khc - h s hiu chnh. khc = k1 . k2 k1 - h s hiu chnh theo nhit . k1 = 1 k2 - h s hiu chnh v s dy cp cng t trong mt rnh, vicc rnh t 2 cp, khong cch gia cc si l 300 mm. Theo PL VI.11 TL1 ta c k2 = 0,93. vi rnh ch t 1 si th k2 = 1. V chiu di t TBATG ti cc TBA ngn nn tn tht in p nh ta c th b qua khng cn kim tra li theo iu kin tn tht in p Ucp. Chn cp t TBATG n B1 Imax = Sttpx 2. 3.Udm 1420,08 2. 3.10 = 40,99 A Fkt = Imax J kt = 40,99 3,1 = 13,22 mm2 Tra PL V.16 TL1, la chn cp tiu chun ph hp l cp c tit din 16 mm2, cp ng 3 li 10 kV cch in XLPE, ai thp, v PVC do hng FURUKAWA (Nht) ch to c Icp = 110 A. Kim tra cp chn theo iu kin pht nng 0,93 . Icp = 0,93 . 110 = 102,37 > Isc = 2 . Imax = 2 . 40,99 = 81,98 Vy cp chn tha mn iu kin. Tra bng PL.V.16 Thit k cp in ca Ng Hng Quang v bng 33.pl gi cp cao p (Cung cp in ca Trn Quang Khnh) v tnh ton tng t cho cc l cp khc ta c kt qu tnh ton chn tit din cp cao p nh sau Bng 4.3- Kt qu chn cp cao p ca phng n 1 NG CP TBATG - B1 TBATG - B2 TBATG - B3 TBATG - B4 TBATG - B5 STT (kVA) 1420,08 2979,67 528,18 445,38 248,14 F (mm2) 16 35 10 10 10 L (m) 125 50 125 275 350 ro (/km) 1,47 0,668 2,33 2,33 2,33 R () 0,092 0,017 0,146 0,321 0,408 N GI (103 /m) 877 1116 586 586 586 THNH TIN (103 /m) 109625 55800 73250 161150 205100 Tng vn u t cho ng dy VD = 604925103 Xc nh tn tht cng sut tc dng trn ng dy Thc hin: Trn Huy Tp Lp 1H3 Khoa H Thng in H in Lc2 2 = 48 N TT NGHIP THIT K CUNG CP IN CHO NH MY LIN HP DT Cng thc xc nh tn tht cng sut tc dng trn ng dy P = Trong Sttpx 2 2 Udm .R.10-3 (kW). R= 1 n .r0 .l n - s ng dy i song song - Tn tht P trn on cp t TBATG B1 P = 1420,082 10 .0,092.10-3 = 1,86 kW Tnh ton tng t cho cc ng dy khc ta c kt qu Bng 4.4 - Tn tht cng sut tc dng trn cc ng dy c a phng n 1 NG CP TBATG - B1 TBATG - B2 TBATG - B3 TBATG - B4 TBATG - B5 F (mm ) 16 35 10 10 10 L (m) 125 50 125 275 350 ro (/km) 1,47 0,668 2,33 2,33 2,33 R () 0,092 0,017 0,146 0,321 0,408 STT (kVA) 1420,08 2979,67 528,18 445,38 248,14 P (kW) 1,86 1,51 0,41 0,64 0,25 Tng tn tht cng sut tc dng trn ng dy PD = 4,67 kW Xc nh tn tht in nng trn ng dy Tn tht in nng trn cc ng dy c xc nh theo cng thc AD = PDTrong -max = 2500 h AD = 4,67. 1225,31 = 5722,198kWh 2.3.Vn u t mua my ct in trong mng cao p ca phng n 1 2.3.1.Chn my ct in Chn my ct pha h p ca TBATG Icb = Snm 8347, 41 (n-1). 3.Udm(2-1). 3.10 = 483,50(A) m =630 A. Gi mi my l Chn my ct cho mch cp t TBATG n B1 Dng in cng bc khi s c hng mt ng cp Icb = Sttpx1420,08 = (n-1). 3.Udm(2-1). 3.10 = 81,99 (A)A Chn my ct HiAS06 my ct in trong nh c Im = 630 A, gi mi my l 28200 USD. Thc hin: Trn Huy Tp Lp 1H3 Khoa H Thng in H in Lc2 -- 2 2 2 2 1 49 N TT NGHIP THIT K CUNG CP IN CHO NH MY LIN HP DT Tnh ton tng t cho cc mch cp khc. Tra bng ph lc 3.1 Nh my in ca Nguyn Vn Ha ta c bng kt qu chn my ct nh sau Bng 4.5 - Kt qu chn my ct cao p phng n I NG CP Stt (kVA) S MCH Icb (A) LOI MY CT N GI (103VN) THNH TIN (103VN) TBATG MCLL 7975,24 1 483,50 HiAS06 HiAS06 28300 28300 56600 28300 TBATG - B1 1349,6381,99HiAS062830056600 TBATG - B2 2643,63172,03 HiAS062830056600 TBATG - B3 553,34 TBATG - B4 504,92 TBATG - B5 327,89 30,49 25,71 14,23 HiAS06 HiAS06 HiAS06 28300 28300 28300 56600 56600 28300 Tng vn u t cho my ct VMC = 204000 USD = 339,60106 2.4.Chi ph vng i ca phng n 1 Khi tnh ton vn u t xy dng mng in y ta ch tnh n gi thnh cp, MBA v my ct in khc nhau ca cc phng n.(V =VB + VD + VMC). nhng phn ging nhau c b qua gim nh khi lng tnh ton. Tn tht in nng trong cc phng n bao gm tn tht in nng trong cc trm bin p v tn tht in nng trong cc ng dy A = AB + AD Chi ph vng i ca phng n 1 - Vn u t V1 = VB + VD + VMC = (2028 + 604,925 + 339,6) . 106 = 2972,525 . 106 -Tng tn tht in nng trong cc trm bin p v ng dy A1 = AB + AD = 416065,017 + 5722,198 = 421787,215(kWh) - Chi ph vng i Cv1 = V + CA = V+CA0. (1+i)T -1 i(1+i)T Trong - V = 2972,525 . 106 - CA01 AA 1= 421787,215kWh A0 = 421787,215. 1000 = 421,787 .106 - i = 12%; T=30 nm. Vy ta c 66 Vy Cv1= 2972,525 .10 + 421,787 .10 . (1+0,12)30 -1 0,12.(1+0,12)30 Vv1 = 6370,097 . 106 Thc hin: Trn Huy Tp Lp 1H3 Khoa H Thng in H in Lc PHNG N II 6 6 50 N TT NGHIP THIT K CUNG CP IN CHO NH MY LIN HP DT 3. Phng n II Trong phng n 2, ta dng chung ng cp cho 2 trm B1 v B2 l on TBATG B2, dng chung ng cp cho 2 trm B3 v B4 l on TBATG B3. Phng n v TBA phn xng khng thay i. Hnh 4.2- S phng n 2 PHNG N 2 TBATG 3.1.Chn MBA phn xng v xc nh tn tht in NNG A trong cc TBA Tnh ton tng t nh phng n 1 ta c cc kt qu sau Bng 4.6 - Kt qu chn MBA phn xng cho phng n 2 n TBA Sdm (kVA) UC/UH POPN (kV) (kW) (kW) UN (%) IO SGi (%) lng (10 ) Thnh tin (106 ) TBATG B1 B2 6300 1000 1600 35/10 10/0,4 10/0,4 9,0 2,5 3,5 46,5 12,2 18,0 7,5 6,5 6,5 0,9 1,5 1,4 2 2 2 405 206 240 810 412 480 B3 B4 B5 315 315 315 10/0,4 0,72 10/0,4 0,72 10/0,4 0,72 4,85 4,85 4,85 4,5 4,5 4,5 6,0 6,0 6,0 2 2 1 76 76 76 152 152 76 Tng vn u t cho TBA VB = 2028 10 Xc nh tn tht in nng trong cc trm bin p Bng 4.7 - Kt qu tnh ton tn tht in nng trong cc TBA phng n 2 TN TBA S MY STT(kVA) SM O N TBATG B1 B2 B3 B4 2 2 2 2 2 8347,41 1420,08 2979,67 528,18 445,38 6300 1000 1600 315 315 9,0 2,5 3,5 0,72 0,72 46,5 12,2 18,0 4,85 4,85 207693,97 58873,06 99565,90 20968,52 18554,56 Thc hin: Trn Huy Tp Lp 1H3 Khoa H Thng in H in Lc3 3 (A) Icb 2 -- 2 2 1 6 51 N TT NGHIP THIT K CUNG CP IN CHO NH MY LIN HP DT B5 1 248,14 315 0,72 4,85 9994,94 Tng tn tht in nng trong cc trm bin pAB = 416065,017 kWh 3.2.Chn dy dn v xc nh tn tht cng sut, tn tht in nng trong mng in Bng 4.8 - Kt qu chn cp cao p ca phng n 2 NG CP Stt (kVA) F (mm2) L (m) ro (/km) R () NTHNH GI TIN (10 /m) (103/m) TBATG - B2 4399,75 TBATG - B3 973,56 50 10 50 125 0,494 2,33 0,012 0,146 1018 586 50900 73250 B2 - B1 B3 - B4 1420,08 445,38 16 10 90 100 1,47 2,33 0,066 0,117 877 586 78930 58600 TBATG - B5 248,14103502,330,408586205100 Tng vn u t cho ng dy VD = 466780 10 Bng 4.9 - Tn tht cng sut trn cc ng dy ca phng n II NG CP TBATG - B2 TBATG - B3 B2 - B1 B3 - B4 TBATG - B5 F (mm2) 120 35 35 16 16 L (m) 50 125 90 100 350 ro (/km) 0,494 2,33 1,47 2,33 2,33 R () 0,012 0,146 0,066 0,117 0,408 Stt (kVA) 4399,75 973,56 1420,08 445,38 248,14 (kW) 2,32 1,38 1,33 0,23 0,25 Tng tn tht cng sut tc dng trn D = 5,51 kW Tng tn tht in nng trn cc ng dy trong phng n II AD = 5,51 . 1225,31 = 6751,46 (kWh) 3.3.Vn u t mua my ct in mng cao p phng n II Tnh ton tng nh nh phng n I, ta c : Bng4.10. - Kt qu chn my ct phng n II NG CP STT S (kVA)MCH LOI MY CT N GI THNH TIN (103VN)(103VN) TBATG8347,41843,50HiAS062830056600 MCLL TBATG - B2 4399,75 TBATG - B3 973,56 TBATG - B5 248,14 1 254,02 56,21 14,33 HiAS06 HiAS06 HiAS06 HiAS06 28300 28300 28300 28300 28300 56600 56600 28300 Tng vn u t cho my ct VMC =136000 USD = 226,4010 Thc hin: Trn Huy Tp Lp 1H3 Khoa H Thng in H in Lc NG N III 52 N TT NGHIP THIT K CUNG CP IN CHO NH MY LIN HP DT 3.4.Chi ph vng i ca phng n II Chi ph vng i ca phng n II -Vn u t V2 = VB + VD + VMC = (2028+ 466,78 + 226,4) .106 = 2701,18 .106 - Tng tn tht in nng trong cc TBA v ng dy A2 = AB + AD = 416065,017 + 6751,46 = 422816,48 kWh - Chi ph vng i Cv2 = V + CA = V+CA0. (1+i)T -1 i(1+i)T Trong - V2 = 2701,18106 - CA02AA 2= 422816,48 kWh A0 = 422816,48 . 1000 = 422,816106 - i = 12%; T=30 nm. Vy Cv2= 2701,18 .106 + 422,816 .106. (1+0,12)30 -1 0,12.(1+0,12)30 = 6107,041.106 4. Phng n III Phng n ny s dng trm PPTT nhn in t h thng v cp cho trm bin p phn xng. Cc trm bin p B1, B2, B3, B4, B5 h t cp 35 kV xung cung cp cho cc phn xng. Cc ng i dy cp l c lp vi nhau. Hnh 4.3- S phng n 3. PH TPPTT 4.1.Chn MBA phn xng v xc nh tn tht in nng A trong cc TBA Tnh ton tng t nh phng n 1, vi ch phng n ny khng dng trm BATG, cc MBA c cp cao p nh mc l 35 kV, h p l 0,4 kV Thc hin: Trn Huy Tp Lp 1H3 Khoa H Thng in H in Lc6 23 3 6 6 6 6 53 N TT NGHIP THIT K CUNG CP IN CHO NH MY LIN HP DT Bng 4.11 - Kt qu chn MBA trong cc TBA phng n III Tn TBA Sdm (kVA) UC/UH POPN (kV) (kW) (kW) UN (%) IO SGi (%) lng (106) Thnh tin (106 ) B1 B2 B3 B4 B5 1000 1600 315 315 315 35/0,4 35/0,4 35/0,4 35/0,4 35/0,4 2,5 3,5 0,8 0,8 0,8 12,2 16,5 4,85 4,85 4,85 6,5 6,5 4,5 4,5 4,5 1,5 1,4 6,5 6,5 6,5 2 2 2 2 1 243 292 98 98 98 486 584 196 196 98 Tng vn u t cho TBA VB = 156010 Bng 4.12 - Tn tht in nng trong cc TBAPP phng n III TN TBA S MY STT(kVA) SM O N B1 B2 B3 B4 B5 2 2 2 2 1 1420,08 2979,67 528,18 445,38 248,14 1000 1600 315 315 315 2,5 3,5 0,8 0,8 0,8 12,2 16,5 4,85 4,85 4,85 59243,71 96378,74 22370,12 19956,16 10695,74 Tng tn tht in nng trong cc trm bin pAB = 208644,47 kWh 4.2.Chn dy dn v xc nh tn tht cng sut, tn tht in nng trong mng in Bng 4.13 - Kt qu chn tit din dy dn ca phng n III NG CP STT (kVA) F (mm ) L (m) ro (/km) R () N THNH GI TIN (10 /m) (103 /m) PPTT - B1 PPTT - B2 PPTT - B3 PPTT - B4 PPTT - B5 1420,08 2979,67 528,18 445,38 248,14 6 10 6 6 6 125 50 125 275 350 5,210 3,120 5,210 5,210 5,210 0,326 0,078 0,326 0,716 0,912 1172 1807 1172 1172 1172 146500 90350 146500 322300 410200 Tng vn u t cho ng dy VD = 111585010 Bng 4.14 - Tn tht cng sut trn cc ng dy ca phng n III NG CP F (mm2) L (m) ro (/km) R () STT (kVA) (kW) PPTT - B1 125 5,210 0,326 1420,08 0,537 PPTT - B2 PPTT - B3 PPTT - B4 PPTT - B5 1050 125 275 350 3,120 5,210 5,210 5,210 0,078 2979,67 0,565 0,326528,180,074 0,716445,380,116 0,912248,140,046 Tng tn tht cng sut tc dng trn D = 1,338 kW Thc hin: Trn Huy Tp Lp 1H3 Khoa H Thng in H in Lc2 2 2 2 2 1 54 N TT NGHIP THIT K CUNG CP IN CHO NH MY LIN HP DT Tng tn tht in nng trn cc dng dy ca phng n III AD = 1,338 . 1225,31 = 1639,465 kWh 4.3.Vn u t mua my ct in mng cao p phng n III Bng4.15. - Kt qu chn my ct phng n III NG CP STT (kVA) S MCH Icb (A) LOI MY CT N GI THNH TIN (103VN)(103VN) TPPTT 8347,41 137,70 HAT0632600 65200 MCLL-1-HAT063260032600 PPTT - B1 1420,08 PPTT - B2 2979,67 23,43 HAT0632600 49,15 HAT0632600 65200 65200 PPTT - B3 PPTT - B4 PPTT - B5 528,18 445,38 248,14 8,71HAT0632600 7,35HAT0632600 4,09HAT0632600 65200 65200 32600 Tng vn u t mua my ct VMC = 264000 USD = 391,20106 4.4.Chi ph vng i ca phng n III - Vn u t V3 = VB + VD +VMC = 1560.106 + 1115,85.106 + 391,2.106 = 3067,05.106 - Tng tn tht in nng ca cc TBA v ng dy A3 = AB + AD = 208644,47 + 1639,465 = 210283,935 kWh - Chi ph vng i Cv3 = V + CA = V+CA0. (1+i)T -1 i(1+i)T Trong - V3 = 3067,05.106 - CA03 AA=3= 210283,935 kWh A0 = 210283,935 .1000 = 210,284.106 - i = 12%; T=30 nm. 66 Vy Cv3= 3067,05.10 + 210,284 .10 . (1+0,12)30 -1 0,12.(1+0,12)30 = 4760,926 .106 Thc hin: Trn Huy Tp Lp 1H3 Khoa H Thng in H in Lc 6 55 N TT NGHIP THIT K CUNG CP IN CHO NH MY LIN HP DT 5. Phng n IV Hnh 4.4- S phng n 4 PHNG N IV PHNG N 4 TPPTT Phng n ny s dng trm PPTT nhn in t h thng v cp cho cc trm bin p phn xng. Cc TBA phn xng h t cp 35kV xung cp 0,4 kV cung cp cho ph ti ca cc phn xng. Tnh ton tng t nh phng n 3 ta c 5.1.Chn MBA phn xng v xc nh tn tht in nng A trong cc TBA Bng 4.16 - Kt qu chn MBA trong cc TBA phng n IV Tn TBA Sdm (kVA) UC/UH POPN (kV) (kW) (kW) UN (%) IO SGi (%) lng (106) Thnh tin (106 ) B1 B2 B3 B4 B5 1000 1600 315 315 315 35/0,4 35/0,4 35/0,4 35/0,4 35/0,4 2,5 3,5 0,8 0,8 0,8 12,2 16,5 4,85 4,85 4,85 6,5 6,5 4,5 4,5 4,5 1,5 1,4 6,5 6,5 6,5 2 2 2 2 1 243 292 98 98 98 486 584 196 196 98 Tng vn u t cho TBA VB = 1560 10 Bng 4.17 - Tn tht in nng trong cc TBAPP phng n IV TN TBA S MY STT(kVA) SM O N B1 B2 B3 B4 B5 2 2 2 2 1 1420,08 2979,67 528,18 445,38 248,14 1000 1600 315 315 315 2,5 3,5 0,8 0,8 0,8 12,2 16,5 4,85 4,85 4,85 59243,71 96378,74 22370,12 19956,16 10695,74 Tng tn tht in nng trong cc trm bin pAB = 208644,47 kWh Thc hin: Trn Huy Tp Lp 1H3 Khoa H Thng in H in Lc23 3 2 2 -- 2 2 1 56 N TT NGHIP THIT K CUNG CP IN CHO NH MY LIN HP DT 5.2.Chn dy dn v xc nh tn tht cng sut, tn tht in nng trong mng in Bng4.18- Kt qu chn cp cao p phng n IV NG CP STT F L ro R N GI THNH TIN (kVA)(mm )(m)(/km)()(10 /m) (103/m) PPTT - B2 PPTT - B3 B2 - B1 B3 - B4 PPTT - B5 4399,75 973,56 1420,08 445,38 248,14 16 6 6 6 6 50 125 90 100 350 1,25 5,21 5,21 5,21 5,21 0,031 0,326 0,235 0,261 0,912 2793 1172 1172 1172 1172 139650 146500 105480 117200 410200 Tng vn u t cho ng dy VD = 91903010 Bng4.19 - Tn tht cng sut trn cc ng dy ca phng n IV NG CP PPTT - B2 PPTT - B3 B2 - B1 B3 - B4 PPTT - B5 F (mm ) 120 50 50 50 50 L (m) 50 125 90 100 350 ro (/km) 1,25 5,21 5,21 5,21 5,21 R () 0,031 0,326 0,235 0,261 0,912 STT (kVA) 4399,75 973,56 1420,08 445,38 248,14 (kW) 0,489 0,252 0,387 0,042 0,046 Tng tn tht cng sut tc dng trn D = 1,216 kW Xc nh tn tht in nng trn cc ng dy AD = 1,216 . 1225,31 = 1489,977 kWh 5.3.Vn u t mua my ct in mng cao p phng n IV Bng 4.20 - Kt qu chn my ct phng n IV NG CP STT (kVA) S MCH Icb (A) LOI MY CT N GI (103VN) THNH TIN (103VN) TPPTT MCLL PPTT - B2 PPTT - B3 PPTT - B5 8347,41 4399,75 973,56 248,14 1 137,70 HAT06 HAT06 72,58 HAT06 16,06 HAT06 4,09HAT06 32600 32600 32600 32600 32600 65200 32600 65200 65200 32600 Tng vn u t cho my ct VMC =176000 USD = 260,80 .106 Thc hin: Trn Huy Tp Lp 1H3 Khoa H Thng in H in Lc57 N TT NGHIP THIT K CUNG CP IN CHO NH MY LIN HP DT 5.4.Chi ph vng i ca phng n IV - Vn u t V4 = VB + VD + VMC = 1560.106 + 919,03.106 + 260,8.106 = 2739,83 .106 - Tng tn tht in nng trong cc TBA v ng dy A4 = AB + AD = 208644,47 + 1489,977 = 210134,447 kWh - Chi ph vng i Cv4 = V + CA = V+CA0. (1+i)T -1 i(1+i)T Trong - V4 = 2739,83 .106 - CA04 AA 4= 210134,447 kWh A0 = 210134,447.1000 = 210,134.106 - i = 12%; T=30 nm. 66 Vy Cv4= 2739,83 .10 + 210,134.10 . (1+0,12)30 -1 0,12.(1+0,12)30 = 4432,498 .106 T ta c bng tng kt kt qu tnh ton Bng 4.21 - Tng hp ch tiu kinh t k thut ca cc phng n. PHNG N VN U T (106 ) TN THT IN CHI PH VNG I NNG (kWh) (106 ) Phng n I Phng n II Phng n III Phng n IV 2972,525 2701,180 3067,050 2739,830 421787,215 422816,480 210284,935 210134,447 6370,097 6107,041 4760,926 4432,489 Nhn xt T kt qu tnh ton ta thy phng n IV l phng n ti u v c vn u t v chi ph vng i nh, mt khc tn tht in nng cng rt nh. V th ta s dng phng n IV lm phng n thit k mng cao p cho nh my. II. TNH TON NGN MCH, CHN V KIM TRA THIT B CHO NH MY LIN HP DT 1. Tnh ton ngn mch v la chn cc thit b in Mc ch ca tnh ton ngn mch l kim tra iu kin n nh ng v n nh nhit ca thit bv dy dn c chn khi c ngn mch trong h thng. Dng in ngn mch tnh ton chn kh c in l dng ngn mch 3 pha. la chn, kim tra dy dn v cc kh c in ta cn tnh ton 6 im ngn mch N- ngn mch trn thanh ci trm phn phi trung tm kim tra my ct v thanh ci. N1,N2 , N5 Cc im ngn mch pha cao p ca cc trm bin p phn xng kim tra cp v thit b cao p ca cc trm. in khng ca h thng c tnh theo cng thc sau X HT = U tb 2 SN () Thc hin: Trn Huy Tp Lp 1H3 Khoa H Thng in H in Lc2 2 1 XHT = tb 58 N TT NGHIP THIT K CUNG CP IN CHO NH MY LIN HP DT Trong SN cng sut ngn mch v pha h p ca trm bin p khu vc, SN = 400 MVA. Utb - in p trung bnh ca phn li lm vic cha thanh ci. Utb = 1,05 Udm in tr v in khng ca ng dy R= 1 n .r0.l () 1 X= .x 0 .l () n Trong r0, x0 - in tr v in khng trn 1 km dy dn (/km) l - chiu di ng dy.(km) Do ngn mch xa ngun nn dng ngn mch siu qu I bng dng dng in ngn mch n nh I, nn ta c th vit I N = I" = I= U tb 3.ZN Trong ZN - tng tr t h thng in n im ngn mch th i () Tr s dng in xung kch c tnh theo cng thc sau ixk = 1,8. 2 .IN (kA). S tnh ton ngn mch. BATG DDK N CP N2N3 MC PPTT CP N2 BAPX N3 XH ZD N ZC ZCZBN3 N2 ZB Bng 4.22. Thng s ca ng dy trn khng v cp N3 NG DY S MCH F(mm2) L(km) r0(/km) x0(/km) R() X() TBAKCN- TPPTT2AC-70160,3420,1292,7361,032 TBATG - B2 TBATG - B3 3 160,050 3 6 0,125 1,25 5,12 0,068 0,073 0,031 0,326 0,002 0,005 B2 - B1 B3 - B4 TBATG - B5 2 2 3 6 0,090 3 6 0,100 3 6 0,350 5,12 5,12 5,12 0,073 0,073 0,073 0,234 0,261 0,192 0,003 0,004 0,013 Tnh dng in ngn mch ti im N trn thanh ci ca trm phn phi trung tm. U 236, 752 SN 400 Thc hin: Trn Huy Tp Lp 1H3 Khoa H Thng in H in Lc = 16,5.0,426 = 59 N TT NGHIP THIT K CUNG CP IN CHO NH MY LIN HP DT X = XDDK + XHTR = R DDK = 2,736 () I N = U tb 3.ZN 36, 75 3. (2, 7362 2 ) kA) iXK = 1,8. 2.IN = 1,8. 2.4, 24 = 10,79 (kA) Tnh ngn mch ti im N1 trn thanh gp pha cao p ca trm bin p phn xng B2 R N1 = R DDK + R C1 = 2,736 +0,031=2,407() XN1 = XDDK + XHT C1 I N1-2 = U tb 3.ZN2-2 36, 75 3. (2, 4072 2 ) kA) i xk N1-2 = 1,8. 2.IN = 1,8. 2.4, 22 = 10,74(kA) Cc im ngn mch khc dc tnh ton tng t, kt qu ghi trong bng Bng4.23- Kt qu tnh dng in ngn mch IM NGN MCH N N1-1 N1-2 N1-3 N1-4 N1-5 V TR Thanh ci PPTT Thanh ci B1 Thanh ci B2 Thanh ci B3 Thanh ci B4 Thanh ci B5 IN, kA 4,24 3,99 4,22 3,95 3,98 3,70 iXK, kA 10,79 10,16 10,74 10,06 10,13 9,42 Tnh ngn mch ti N2 trn thanh ci pha h p trm bin p phn xng B2 in tr v in khng ca my bin p c tnh theo cng thc 2 R B =N2 dm = S dm 16002 XB = U N %.U2dm6,5.0,42 100.Sdm 100.1600 .106Tnh tng t i vi cc trm bin p khc ta c kt qu Bng 4.24 in tr v in khng ca cc my bin p phn xng My bin p Sm,kVA Po,kWPN,kW UN,% R,mX,m B1 B2 B3 B4 B5 1000 1600 315 315 315 2,5 3,5 0,8 0,8 0,8 12,2 16,5 4,85 4,85 4,85 6,5 6,5 4,5 4,5 4,5 1,95 1,03 7,82 7,82 7,82 10,4 6,5 22,86 22,86 22,86 Thc hin: Trn Huy Tp Lp 1H3 Khoa H Thng in H in Lc qd TT = 60 N TT NGHIP THIT K CUNG CP IN CHO NH MY LIN HP DT in tr v in khng ca cc phn t cp 35kV quy i v cp 0,4 kV R qd 35kV 2 tb0,435kV . tb350,42 36,752 X 35kV 2 tb0,4X35kV . tb350,42 36,752 Kt qu quy i cc thng s cp 35 kV sang cp 0,4 kV Bng 4.25- Bng cc thng s quy i ca in tr Cp 35 kV R, X, Cp 0,4 kV R, m X, m HT TBATTKCN- TPPTT 2,736 3,376 1,032 0,4 0,324 0,122 TBATG - B2 TBATG - B3 B2 - B1 B3 - B4 TBATG - B5 0,031 0,326 0,234 0,261 0,192 0,002 0,005 0,003 0,004 0,013 0,0037 0,0002 0,0390,0006 0,0280,0004 0,0310,0005 0,1080,0015 Dng in ngn mch ti im N2-2 XN2 = XDDK + XHT C1 B2 mR N2 = R DDK + R C1 +R B2 = 0,324 +0,0037+1,03=1,358(m) I N2-2 = U tb 3.ZN2-2 0, 4 3.10 3 (7, 022221,3582 ) 32, 29(kA) ixk N2-2 = 1,8. 2.IN2-2 = 1,8. 2.32,29 = 82,20(kA) Tnh ton tng t cho cc im khc ta c kt qu Bng 4.26 - Kt qu tnh ngn mch pha h p ca cc trm bin p phn xng. im N2-1 N2-2 N2-3 N2-4 N2-5 R, m 2,302 1,391 8,183 8,175 8,252 X, m 10,9224 7,0222 23,3826 23,3825 23,3835 IN, kA 20,69 32,26 9,32 9,32 9,31 ixk, kA 52,67 82,12 23,72 23,72 23,70 2.La chn v kim tra cc thit b in 2.1.Trm phn phi trung tm Trm phn phi trung tm l ni trc tip nhn in t h thng v cung cp in cho nh my, do vic la chn s ni dy ca trm c nh hng ln v trc tip n vn an ton cung cp in cho nh my. S cn phi tha mn cc iu kin c Thc hin: Trn Huy Tp Lp 1H3 Khoa H Thng in H in LcI (kA) cr 6 61 N TT NGHIP THIT K CUNG CP IN CHO NH MY LIN HP DT bn sau m bo iu kin cung cp in lin tc theo yu cu ph ti, phi r rng v thun tin trong vn hnh, s l s c, an ton lc vn hnh v sa cha, hp l v mt kinh t trn c s m bo cc yu cu k thut. 2.1.1.La chn v kim tra my ct, thanh dn ca TPPTT Cc my ct t ti trm PPTT gm c 2 my ct ng dy trn khng v mt my ct phn on, cc my ct ng dy t u cc ng cp ni vo thanh ci. Tt c cc my ct ny u c chn l my ct F400 ca hng Schneider (Php). Cc iu kin chn my ct in p nh mc UdmMC Udmm Dng in nh mc IdmMC Icb = 2.Ilvmax Dng in ct nh mc Idmct IN Dng in n nh ng cho php idm d ixk Bng4.27 - Thng s ca my ct c chn Loi Um (kV) Im (A) Ictm In/tn (kA) (kA/s) HAT06366302525/150 Nh vy cc iu kin chn my ct u tha mn. 2.1.2.Chn thanh dn cho TPPTT Chn thanh dn ng- nhm tit din hnh mng c sn c cc thng s Bng 4.28 - Thng s ca thanh dn Dng in Kch thc,mm Tit din mt cc Mmen tr khngMmen qun tnh cm3 cm4 cho php lu di c hai thanh, A h b mm2 Mt thanh Hai thanh Mt thanh Hai thanh ng Nhm 75355,569514,1 3,1730,153,1 7,6113 3250 2670 Thanh dn cho chn vt cp nn khng cn kim tra iu kin n nh ng. 2.1.3.La chn v kim tra BU My bin p o lng (my bin in p) c chc nng bin i in p s cp bt k xung 100 V hoc 100/ 3 cp ngun p cho mch o lng, iu khin v bo v. Cc BU thng u theo s V/V; Y/Y. ngoi ra cn c loi BU 3 pha 5 tr Y0/Y0 ng cun tam gic h c nhim v bo chm t 1 pha. BU ny thng dng cho mng trung tnh cch in (10 kV, 35 kV). BU c chn theo iu kin in p nh mc UdmBU Udm m = 35 kV Bng 4.29 Thng s k thut ca BU loi 4MS36 Thng s k thut Udm kV36 Thc hin: Trn Huy Tp Lp 1H3 Khoa H Thng in H in Lc 70 1,21,2 3 35 70 62 N TT NGHIP THIT K CUNG CP IN CHO NH MY LIN HP DT U chu ng tn s cng nghip 1',kV U chu ng xung 1,2/50 s, kV U1dm, kV U2 dm,V Ti nh mc, VA Trng lng, kG 170 35/ 3 120/ 3 400 55 2.1.4.La chn v kim tra my bin dng BI My bin dng in BI c chc nng bin i dng in s cp xung 5 A (1A hoc 10 A) nhm cp ngun dng cho o lng t ng ha v bo v r le. BI c chn theo iu kin sau in p nh mc Udm BI Udmm = 35 kV I 8347, 41 Dng in s cp nh mc IdmBI cb max = =114,75(A) Chn BI loi 4ME16 kiu hnh tr do hng Siemens ch to Bng 4.30 Thng s k thut ca BI loi 4ME16 Thng s k thut Udm, kV U Chu ng tn s cng nghip 1', kV U Chu ng xung 1,2/50s kV I1 dm, A I2 dm, A I nhit1s, kA I ng, kA 4ME16 36 170 5-1200 1 hoc 5 80 120 2.1.5.La chn chng st van Chng st van l thit b in tr phi tuyn c nhim v chng st truyn t ng dy khng cho truyn vo trm phn phi v trm bin p. Vi in p nh mc ca li in, in tr chng st c tr rt ln khng cho dng in i qua, kkhi c qu in p kh quyn, in tr ca chng st van gim xung rt b tho dng in st xung t. Chng st van c chn theo cp in p Udmm = 35 kV. Chn loi chng st van PBC-35 do Lin X ch to c Udm = 35 kV Thc hin: Trn Huy Tp Lp 1H3 Khoa H Thng in H in Lc 63 N TT NGHIP THIT K CUNG CP IN CHO NH MY LIN HP DT T MC u vo Cc t MC u ra ca phn on TG1 T BU v CSV T MC phn on T BU v CSV Cc t MC u ra ca phn on TG2 T MC u vo Hnh 4.31 S ghp ni trm trung tm tt c cc t hp b u ca hng SIEMENS, cch in bng SF6, khng cn bo tr. Dao cch ly c 3 v tr H mch, ni t v tip t 2.2.Trm bin p phn xng Cc trm bin p phn xng u t cc my bin p do cng ty thit b in ng Anh ch to theo n t hng. V cc trm bin p phn xng t khng xa TPPTT, nn pha cao p ch cn t cu dao v cu ch. Cu dao dng cch ly my bin p khi sa cha. Cu ch dng bo v ngn mch v qu ti cho my bin p. Pha h p t p t mt tng v cc p t mt nhnh, thanh ci h p c phn on bng p t mt phn on hn ch dng ngn mch v pha h p ca trm ta chn phng thc cc my bin p lm vic c lp. Hnh 4.32 - S trm 1 my bin p T cao p MBA 315- 35/0,4 T A tng T A nhnh S d trm 2 my bin p T cao p MBA 35/0,4 T A tng T A nhnh T A T A nhnh T A tng MBA 35/0,4 T cao p phn on 2.2.1.La chn v kim tra dao cch ly cao p Cu dao hay cn gi l dao cch ly c nhim v ch yu l cch ly phn mang in v phn khng mang in, to khong cch an ton trng thy, phc v cho cng tc sa Thc hin: Trn Huy Tp Lp 1H3 Khoa H Thng in H in Lc64 N TT NGHIP THIT K CUNG CP IN CHO NH MY LIN HP DT cha, kim tra, bo dng li in. Dao cch ly cng c th ng ct dng khng ti ca my bin p. Cu dao c ch to mi cp in p. Ta dng chung mt loi dao cch ly cho tt c cc trm bin p d dng cho vic mua sm lp t v thay th. Dao cch ly c chn theo cc iu kin sau in p nh mc UdmCL Udm m = 35kV Dng in nh mc IdmCL Icbmax = 36,95 A Dng in n nh ng cho php idmd ixk = 10,47 kA Chn loi 3DC do hng Siemens ch to Bng 4.33 Thng s k thut ca dao cch ly 3DC UM, kV 36 IM, A 630-2500 INt, kA 20-31,5 INmax, kA 50-80 2.2.2.La chn v kim tra cu ch cao p Cu ch l thit b bo v qu ti v ngn mch. Cu ch c nhiu kiu, c ch to nhiu cp in p khc nhau. cp in p cao p v trung p thng dng loi cu ch ng. iu kin chn cu ch in p nh mc Udmcc Udmm = 35 kV Dng in nh mcIdmcc Icb = 1,4.SdmBA 3.Udm Dng in ct nh mc Idmct IN(3) Chn cu ch ng cao p do Siemens ch to. Bng 4.34 - Kt qu chn cu ch cao p TRMIcb, AIN(3), kA LOI CU CH UM, kV IM, A ICTNMIN, A ICTN, kA B1 B2 B3 B4 B5 23,09 36,95 7,27 7,27 7,27 3,99 4,22 3,95 3,98 3,34 3GD1 606-5B 3GD1 608-5D 3GD1 604-5B 3GD1 603-5B 3GD1 601-5B 36 36 36 36 36 25 40 16 16 16 230 315 62 62 62 31,5 31,5 31,5 31,5 31,5 2.2.3.La chn v kim tra ptmt ptmt l thit b ng ct h p, c chc nng bo v qu ti v ngn mch. Do c u im hn hn cu ch l kh nng lm vic chc chn, tin cy, an ton, ng ct ng thi 3 pha v kh nng t ng ha cao, nn ptmt d t tin vn c s dng rng ri trong li in h p cng nghip cng nh li in sinh hot. ptmt tng, ptmt nhnh v ptmt phn on u chn dng cc ptmt ca hng Merlin Gerin ch to. ptmt c chn theo cc iu kin sau i vi ptmt tng v ptmt phn on Thc hin: Trn Huy Tp Lp 1H3 Khoa H Thng in H in Lc2 = 65 N TT NGHIP THIT K CUNG CP IN CHO NH MY LIN HP DT in p nh mc UdmA Udmm = 0,38 kV Dng in nh mc IdmA Icb = 1,4.SdmBA 3.Udm Tra bng ph lc PL IV.13 sch thit k cung cp in ca Ng Hng Quang. Ta c: Bng 4.35 -Kt qu chn ptmt tng v ptmt phn on TRM Icb, A Loi S lng Udm, VIdm, A IctN, kV S cc B1 B2 2127,08 3403,33 M25 M40 3 3 690 690 2500 4000 75 75 3--4 3--4 B3 B4 B5 670,03 320-800A/C801N 3 670,03 320-800A/C801N 3 670,03 320-800A/C801N 1 690 690 690 800 800 800 25 25 25 3--4 3--4 3--4 i vi ptmt nhnh in p nh mc UdmA Udmm = 0,38 kV Dng in nh mc IdmA Itt = Sttpx n. 3.Udmm Trong n - s ptmt nhnh a in v phn xng. Bng4.36 - kt qu chn ptmt nhnh Tn phn xngSTT, kVAITT, ALoiSLUdm, VIdm, A IctN, kA B phn si B phn dt vi 1361,46 2068,52 2979,14 4527,14 M25 M25 2690 690 2500 2500 55 55 B phn nhum PX l PX sa cha c kh PX mc Trm bm Ban qun l v PTN 352,94 291,52 153,86 133,37 114,77 175,24 536,24 442,92 233,78 202,63 174,37 266,25 M10 M08 M08 M08 M08 M08 2 2 1 1 1 1 690 690 690 690 690 690 800 800 800 800 800 800 40 40 40 40 40 40 Kho vt liu trung tm 58,6289,06M08169080040 2.2.4.La chn thanh gp Thanh gp gp l ni nhn in nng t ngun cung cp n v phn phi in nng cho cc ph ti tiu th. Thanh gp l phn t c bn ca thit b phn phi. Ty theo dng ph ti m thanh gp c cu to khc nhau.Cc thanh gp c chn theo iu kin pht nng cho php. Dng in cng bc tnh vi trm bin p c cng sut ln nht l trm B2 c Stt = 2979,67 kVA. k1k2Icp Stt 3.Udm 2979,67 3.0,38 = 4527,14 A Thc hin: Trn Huy Tp Lp 1H3 Khoa H Thng in H in Lc66 N TT NGHIP THIT K CUNG CP IN CHO NH MY LIN HP DT Ta chn thanh dn ng tit din hnh ch nht c kch thc 100x10mm2 mi pha ghp 3 thanh c dng in cho php Icp = 4650 A k1 = 1 Vi thanh gp t ng k2 = 1 (h s hiu chnh theo nhit mi trng) Icp = 4650 > Icb = 4527,14 A 2.2.5.Kim tra cp chn Ta ch cn kim tra vi tuyn cp c dng ngn mch ln nht IN2 = 4,22 kA Kim tra cp chn theo iu kin n nh nhit F . I . t qd Trong - h s nhit , cp li ng = 6 - dong in ngn mch n nh. tqd - thi gian quy i c xc nh nh tng thi gian tc ng ca bo v chnh t ti my ct in gn im s c vi thi gian tc ng ton phn ca my ct in, tqd = f(, t). t - thi gian tn ti ngn mch (thi gian ct ngn mch), ly t = 0,5 s = I" I, ngn mch xa ngun (I = I) nn = 1 Tra th trang 109 TLVI tm c tqd = 0,4 Tit din n nh ca cp F .I. t qd = 6.4,22. 0, 4 = 16,01 mm2 Vy cp chn c tit din 50 mm2 l hp l. III. THUYT MINH V VN HNH S 1. Khi vn hnh bnh thng Cc ptmt lin lc v my ct phn on thanh ci 35 kV lun trng thi m. 2. Khi c s c trm phn phi trung tm. - Khi 1 ng dy trn khng b s c th thanh gp ni vi ng dy b mt in, my ct trn ng dy m v my ct phn on thanh gp c ng li. - Khi mt thanh gp b s c th my ct pha ng dy v cc my ct sau thanh gp m ph ti nh my c cp in thng qua thanh gp cn li ca TPPTT. trm bin p phn xng. - Khi s c 1 ng cp t trm TPPTT v trm bin p phn xng no th my bin p ni vo ng cp s mt in. ATM tng ca my ct s c m v ATM lin lc s ng li - Khi s c 1 my bin p th dao cch ly v ATM tng ca MBA s m v ATM lin lc s ng li 3. Khi sa cha nh k - Khi cn sa cha mt my bin p th ATM phn on c ng li sau my ct u ng dy v ATM tn ni vi MBA s c m v a my bin p ra sa cha(DCL c th ng ct khng ti vi cc MBA c cng sut di 1000kVA). - Khi cn sa cha phn on thanh gp no TPPTT th my bin p ni vo thanh on gp s mt in. Thc hin: Trn Huy Tp Lp 1H3 Khoa H Thng in H in Lc TTPPTT TTPPTT XPLE(3x16) XPLE(3x6) 6) 67 N TT NGHIP THIT K CUNG CP IN CHO NH MY LIN HP DT S NGUYN L MNG IN CAO P HAT06 4ME16 HAT06 35 kV 4MS36 HAT06 HAT06 PBC 35 HAT06 PBC 35 XP XPLE(3x6) LE ( 3x XPLE(3x6) 3DC 3GD1 608-5D B2 M40 M253GD1 606-5B B1 3GD1 604-5B B3 M12 M123GD1 603-5B B4 3GD1 601-5B M08 B5 qb5 qb5 qb6 qb6 q b7 q b7 qb8 qb8 qb4PX2 PX1PX9PX8PX3PX4PX5PX6PX7 Thc hin: Trn Huy Tp Lp 1H3 Khoa H Thng in H in Lc 68 N TT NGHIP THIT K CUNG CP IN CHO NH MY LIN HP DT IV.THIT K MNG IN H P CA PHN XNG SA CHA C KH 1.nh gi v ph ti ca phn xng sa cha c kh Tng cng sut nh mc (Pm) ca cc thit b dng in trong PXSCCK l 250,0 kW trong cng sut l ca cc thit b in l cc my ct gt nh tin, phay,bo, mi...,chim ch yu. Yu cu v cung cp in khng cao lm, in p yu cu khng c g c bit m ch l in p 0,38 kV. Cn li l cng sut ca my khoan v my phay,cc my ny cng khng c yu cu c bit g v cung cp in Nh vy qua phn tch trn ta nh gi ph ti phn xng sa cha c kh l h loi III. Phn xng SCCK c din tch l 2600m2 gm 51 thit b chia lm 5 nhm. Cng sut tnh ton ca phn xng l 153,86 kVA trong 39 kW s dng chiu sng. Trong t phn phi t 1 ptmt tng v 6 ptmat nhnh cp in cho 5 t ng lc v 1 t chiu sng 2.La chn s cung cp in cho phn xng sa cha c kh 2.1.La chn s cung cp in cho phn xng Mng in phn xng thng c cc dng s chnh sau S hnh tia Kiu s hnh tia(H-1,2) mng cp cc thit b c dng in c cung cp trc tip t cc t ng lc (TL) hoc t cc t phn phi (TPP) bng cc ng cp c lp. Kiu s CC c tin cy CC cao, nhng chi ph u t ln thng c dng cc h loi I v loi II tpp tl tpp tl tl tl tl c c tl h-1 tl h-2 S ng dy trc chnh Kiu s phn nhnh dng cp(H-3) cc TL c CC t TPP bng cc ng cp chnh cc ng cp ny cng mt lc CC cho nhiu t ng lc, cn cc thit b cng nhn in t cc TL nh bng cc ng cp cng mt lc cp ti mt vi thit b. u im ca s ny l tn t cp, chng loi cp cng t. N thch hp vi cc phn xng c ph ti nh, phn b khng ng u. Nhc im l tin cy cung cp in thp thng dng cho cc h loi III. Kiu s phn nhnh bng ng dy (ng dy trc chnh nm trong nh, H-4). T cc TPP cp in n cc ng dy trc chnh (cc ng dy trc chnh c th l cc cp mt si hoc ng dy trn g trn cc s bu - li t dc tng nh xng hay ni c nhiu thit b). Thc hin: Trn Huy Tp Lp 1H3 Khoa H Thng in H in Lc 69 N TT NGHIP THIT K CUNG CP IN CHO NH MY LIN HP DT T cc ng trc chnh c ni bng cp ring n tng thit b hoc nhm thit b. Loi s ny thun tin cho vic lp t, tit kim cp nhng khng m bo c tin cy CC, d gy s c ch