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CU HI L THUYT THC TP

Cu 13 : Mch bo v so lch cho MBA

a. Bo v so lch MBA: S dng rle SEL387

- Nh ch to : USA

-Chc nng : +Bo v so lch MBA 87T

+Bo chng chm t c gii hn 50REF

+Bo v 50/51B

+Bo qa ti 49

Bo v so lch 87T:

- Bo v so lch c hm lm nhim v bo v chnh cho MBA,loi tr ccs c NM 1 pha hoc nhiu pha bn trong MBA

- thc hin chc nng bo v ny Role SEL387 ly tn hiu u vo lcc dng th cp ca cc TI sau:

+ TI pha 110kv, t s 300/1(A),v tr my ct 132

+ TI pha 35kv, t s 600/1(A),v tr my ct 332

+ TI pha 22kv, t s 300/1(A),v tr my ct 432

- Trong cc role so lch s hin i ngi ta thc hin cn bng pha v trs ca dng in th cp cc pha MBA ngay trong role so lch.

- c im quan trng ca bo v so lch cho MBA l dng in t hoca MBA to nn dng khng cn bng chy qua role. Tr s qu cadng khng cn bng ny c th rt ln trong ch ng MBA khng tihoc ct ngn mch ngoi. V vy trong cac role s hin i ngi ta condng thnh phn hi bc hai ca dng in t ho MBA hm bo

v,ngn chn tc ng sai do nh hng ca dng t ho.

-Bo v so lch MBA lm vic theo nguyn l so snh trc tip gia tr vgc pha ca dng in ba pha MBA

IR =

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I1T,I2T,I3T l dng th cp MBA

I4T l dng t ho khi ng xung kch MBA

-Khi s c ngoi vng bo v :IR = =0 rle skhng tc ng

-Khi s c trong vng bo v : IR = 0

V bo v s tc ng nu IR > IKR

-Khi c NM trong vng bo v ca MBA th b phn vi s l trong rleSEL 387 s lm nhim v so snh dng in c ba pha MBA ,lc ny dngso lch s c gi tr ln hn ngng ci t ca rle . Do rle s tcng khp tip im ca n v a tn hiu i ct MC

-Vng bo v ca bo v so lch MBA l phn gii hn bo v MBA : tcc TI ca ba pha MBA chc nng i ct khi 87T tc ng v a tn hiui ct cc MC ba pha MBA

Nguyn nhn xut hin dng khng cn bng :

-Anhr hng ca bin dng

+Do cu to ca cc bin dng khc nhau

+Cc dng s cp khc nhau , cc t s bin dng khc nhau nnI1T,I2T,I3T khng bng nhau dn n xut hin dng IKCB

-Do dng xung kch t ho

-Do t u dy ca MBA

-nh hng ca sng hi ,-Cc nhiu lon trn li

Cu 14 : Nu s nguyn l 87T ,87N so snh hai s :

S 87T :

Bo v so lch MBA lm vic trnnnguyn rt nh lut KS1 ,so snh dngin u vo v u ra MBA : IR = I1+ I2+ I3

-Khi ngn mch ngoa khu vc bo v v khi vn hnh bnh thng dng vorle so lch gn bng 0 ,v bo v s khng tc ng IR = I1+ I2+ I3=IKCB= 0

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-Khi ngn mc trong vng bo v , IR c tr s ln lm rle tc ng i ctMC cc pha ca MBA khng thi gian

S 87N

BVSL th t khng 87N cn c gi l bo v qu dng chm t c giihn 50REF

-Nguyn tc lm vic ca BVTTK MBA l trn nguyn l nh lut KS1 sosnh tng dng in ba pha v dng in trong dy trung tnh ca cng mtcun dy MBA : IREF = IA +IB +IC +I0

+Khi ngn mch ngoi khu vc bo v v khi vn hnh bnh thng dngvo rle gn bng 0 bo v s khng tc ng IREF = IA +IB +IC +I0=IKCB =0

+Khi c ngn mch trong khu vc bo v IREF c tri s ln lm rle tcng i ct MC cc pha MBA

So snh hai s :

-S 87T :

+p dng vi MBA hai v ba dy qun c mt hoc nhiu ngun cung cp.

+Vng bo v so lch MBA bao gm cc thit b nm gia cc TI ly tnhiu bo v

+L bo v chnh cho MBA

-S 87N :

+BVSL 87N p dng i vi cc cun dy MBA c ch lm vic trungtnh trc tip ni t

+Phm vi ca bo v :gm cc thit b nm gia TI ly tn hiu BV vthng ch gii hn trong phm vi bo v

+L BV d phng cho 87T c bit l cc trng hp chm chm gn imtrung tnh hoc trung tnh chm v

Cu 1 : Gii thiu tng qut TBA ni thc tp :

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-Trm bin p 110KV Tnh Phong nm trong khu cng nghip Tnh Phongthuc huyn Sn Tnh ,tnh Qung Ngi.

-Trm bin p 110KV Tnh Phong thuc chi nhnh in cao th Qung Ngi-X nghip in cao th Min Trung.

-Trm c ng in vo ngy :8/10/2003,do tnh hnh thc t ca ph tinn trm ch mi xy dng c mt ngn l th nht.

-Gm MBA(my bin p)40MVA (theo thit k xy dng trm t 2my).Thit b phn phi trong trm lp t theo s 1 thanh gp ,ph ti hinti cc cp in p nh sau:

+Xut tuyn 372: 4MW

+Xut tuyn 474: 3MW

+Xut tuyn 476: 7MW

+Xut tuyn 472: 1.5MW

-Lm nhim v d phng cho trm 110KV Qung NGi khi xy ra cc trnghp s c hoc thay i phng thc cung cp in

-Ngoi ra trm 110KV Tnh Phong cn d phng cho trm Dung Qut quang dy 22KV , phn ny do phng thc cung cp in do in lc QNquy nh .

-Hin nay MBA T2 vn cn non ti .Tuy nhin vi s pht trin hin nay vtng lai rt ln .Do vy vn non ti v lu di c th c ci thin .

-Trm hot ng theo s h thng mt thanh gp

-H thng phn phi pha 110KV c nhn in thanh ci trm bin p220KV Dc Si .

-Pha 35KV gm c hai xut tuyn 372 i Sn Tnh,374 i Bnh Sn

-Pha 22KV gm c 5 xut tuyn :+2 xut d phng

+3 xut tuyn cn li :476 cung cp cho th trn Sn Tnh

474 cung cp cho Tnh Th

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472 cung cp cho khu cng nghip Tnh Phong

Phn my bin p:MBAT2 (40MVA)

Kiu : ABB 115/38,5/24KV - 40 MVA , 3 pha 3 cun dy , t u

dy : Y0/ /Y0 - 11- 0

Cc thit b chng st :

Gm c 2 loi chng st :

-Chng st nh thng vo trm dng cc ct thu li .Khi c st nh thngvo trm th s theo ct thu st truyn vo dy dn v i xung t .Nh vyMBA s c bo v an ton

-Khi c sng st t ng dy lan truyn vo MBA s c chng st van bo

v a dng in st xung t mt cch nhanh chng ,khi dng in tnnhanh vo t ,do cc cun dy ca MBA sc bo v bng cc chng stvan t ti c 3 pha cu MBA

+Pha 110KV dng chng st van : CS1T2 dt trc cun cao p pha 110kvMBA T2

+Pha 35KV dng chng st van :CS3T2 t sau cun trung p 35 kv ca T2

+Pha 22KV dng chng st van :CS4T2 t sau cun h p 22 kv ca T2

- bo v chng st lan truyn t ng dy vo thanh gp 35KV (C32)ngi ta dng b chng st van CS TUC32 t trc cun s ca Bin in pTU C32

T dng :

- phc v t dng trong trm , dng hai MBA TD l TD2 v TD4 c cngsut mi my l 110KVA v c t c hai pha 35kv v 22kv .

Mt chiu :

-H thng in mt chiu trong trm c cung cp bi 36 bnh acquy mibnh c in p 6V c mt ni tip nhau

Phng thc vn hnh:lm vic theo phng thc ph np thng xuyn,acquy ni vo thanh ci song song vi h thng np,h thng np cung cpph ti cho li ng thi cho caquy mt dng in nh b al dng in tphng

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Dng ph np:Dng ph np khng c nh hn tr s tnh theo cng thcsau:

Ip=0,03C/36 Trong Ip:0dng in ph np ,Cm :dung lng nh mcca acquy

Phn phi :

-T phn phi trong nh bao gm thit b ng ct; h thng t ng o lng -iu khin; cc h thng thanh ci v cp vo ra kt ni gia cc phn. Tu theothit b lp t trong t hp b v chc nng ca t ngi ta chia t hp ra lmcc loi nh :

+ T my ct: Thit b ng ct l my ct.

+ T o lng: T lp t bin in p phc v cho cng tc o lng, iukhin.

+ T t dng: Lm nhim v bo v v ng ct my bin p t dng. i vi tny thng lp t dao ct c ti km cu ch lm nhim v bo v v ngct.

+ T ni : Lm nhim v lin kt gia cc h thng thanh ci.

-T my ct hp b 22V ca hng LG l loi t my ct hp b phn phi trongnh, cu to bn trong t gm c 3 ngn chnh (xem hnh 1) v c cch ly vinhau.

+A Ngn h p

+B Ngn my ct

+C. Ngn u cp v thanh ci

Cu 5 : Ni dung kim tra MBA trong vn hnh

Cng tc kim tra trong qu trnh vn hnh trong mt ca t nhtmt ln vi ni dung sau:

-Kim tra ting ku ca my .

-Kim tra mc du trong bnh du ph, 0ch s ng h nhit ngu .

-Kim tra tnh trng ca cc s u vo c sch khng , c b rn nt khng,tnh trng r r du , tnh trng cc thanh dn , cc phn s cch in .

-Kim tra h thng qut gi .

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-Kim tra mu sc ca du ,mu sc ca ht ht m.

-Kim tra h thng lm mt .

-Kim tra tnh trng ca cp ,ca thanh dn v thanh tip a.

-Kim tra cc phng tin phng chy cha chy .

Trng vn hnh qu ti hay s c phi kim tra 30 pht mt ln ,mi hintng pht hin c phi ghi vo s theo di my .

i vi b iu p di ti khi chuyn nc phi theo ng nhng quy nh canh ch to.Tnh hnh thay i nc in p phi c ghi vo s nht k vnhnh .

Khi mc du trong MBA cao hn vch quy nh th phi tm nguyn nhn .Khi

cha tch ri mch ct r le hi th khng c m cc van tho du v va xkh , khng c lm cc thao tc khc trnh rle hi tc ng.

Tin hnh kim tra t xut MBA trong cc trng hp sau :

-Khi nhit mi trng thay i ln c ma rao hay l lt

-Khi cc bo v rle tc ng

Tt c cc h hng trong vn hnh phi bo cho iu A3 v lnho chi nhnh bit c bin php x l kp thi .Cc cng vic lm v

cc kt qu khc phuc ,sa cha trong vn hnh phi c ghi vo nht kvn hnh v s theo di vn hnh MBA .

i vi MBA d phng m thi gian ngng vn hnh ko di thphi ch cc iu kin sau :

+Mi thng mt ln ng khng ti trong thi gian 8h sy MBA .

+H thng rle bo v MBA d phng vn phi v tr pht tn hiu kip thi pht hin ,mc du h thp

+Nu trong thi gian ngng vn hnh ko di trn 3 thng th phi c kimtra mt s hng mc cn thit nh: in tr cch in , in tr mt chiu, thmu du ,th tc ng ca cc h thng rle bo v trc khi ng ina MBA vo vn hnh

Cu 7 : Trnh by cc thao tc nhn vin vn hnh khi mt in ton TBA

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Khi c s c mt in ton trm, trong vng 5 pht k t khi xy ra s c,trng kp trm nhanh chng thao tc:

-Xc nhn x c v gii tr chung ci

-Kim tra cc MC 132, 332 ,432 ct tt cha nu cha ct tt th ct cc MCcha ct .

- Ct cc my ct xut tuyn 22-35KV.

-Kim tra s b bn ngoi MBA : quan st van phng n nhit du ,nhit cun dy , mc du ,.ch th ca b i nc

- Kim tra tnh hnh, bo co s c cho trng trm ,iu vin li phnphi ,trc ban B37, KSH-A3 vi cc ni dung sau:

+Bo v no tc ng

+Nu bo v 87T , 50REF-110 , 50REF-22 tc ng , phi bo co r ccthng s c ly trn rle

+Tnh trng MBA hin ti (v tr van phng n ,nhit du , nhit cundy ,mc du , ch th ca b i nc )

-Thc hin theo lnh ca cc cp iu

-u tin :

+cha chy trc (nu c xy ra )

+Cp in li cho cc ph ti 35kv ,22kv bng cc ngun khc

-Cch ly MBA v lm cc bin php an ton kim tra MBA

-Ch ng li MBA khi m bo cc iu kin nu trn

Cu 8 : Trnh by cc thao tc nhn vin vn hnh phi lm khi nhy MC132 trm

-Xc nhn x c v gii tr chung ci

-Kim tra MC 110kv ct tt cha

-Ct cc MC 332 ,432 .

- Ct cc my ct xut tuyn 22-35KV.

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-Kim tra s b gin thanh ci 22kv ,35kv v cc thit b bn pha 35kv, 22kvca trm , kim tra MBA ca trm: quan st van phng n nhit du ,nhit cun dy , mc du ,.ch th ca b i nc

- Kim tra tnh hnh, bo co s c cho trng trm ,iu vin li phn

phi ,trc ban B37, KSH-A3 vi cc ni dung sau:

+Bo v no tc ng

+Bo co r cc thng s c ly trn rle

+Tnh trng thanh ci v thit b trong trm pha 35kv ,22kv ,tnh trng caMBA

-Thc hin theo lnh ca cc cp iu

-Ch ng li MBA khi m bo cc iu kin nu trn

Khi c s c nhy my ct 132, trong vng 5 pht k t khi xyra s c, trng kp trm nhanh chng thao tc:

1. Nu my ct 132 nhy khng phi do bo v chng h hng bn trongmy bin p T2 tc ng, tnh hnh my bin p T2 tt:

- Ct cc my ct xut tuyn 22-35KV.

- Ct cc my ct 432, 332

- iu chnh nc phn p ca MBA T2 v nc thch hp.

- Kim tra tnh hnh, bo co s c cho KSH-A3 v thao tc theo mnh lnhca KSH-A3.

2. Nu my ct 132 nhy do bo v chng h hng bn trong my bin p T2tc ng:

- Ct cc my ct xut tuyn 22-35KV.

- Ct cc my ct 432, 332

- Thc hin cc bc tip theo ph hp vi quy trnh vn hnh v sa chamy bin p ca cc cp c thm quyn.

- Kim tra tnh hnh, bo co s c cho KSH-A3 v thao tc theo mnh lnhca KSH-A3.

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Khi c s c mt in ton trm, trong vng 5 pht k t khi xy ra s c,trng kp trm nhanh chng thao tc:

- Ct cc my ct xut tuyn 22-35KV.

- Ct cc my ct 432, 332.

- Ct MC tng pha 110 KV.

- iu chnh nc phn p ca MBA T2 v nc thch hp.

- Kim tra tnh hnh, bo co s c cho KSH-A3 v thao tc theo mnh lnhca KSH-A3.

Cu 9 : Mt s thit b ph tr ca MBA

a.Van phng n : Khi c xy ra chm chp trong MBA ,lm cho p xut trongbnh tng cao n mc gn nguy him th van phng n ny s b ph v ,hi vdu thot ra ngoi m bo an ton cho MBA .(khng lm cho lng du trongMBA b cng cng trong thng du)

b.Xiphong nhit (b th )

-Dng lc hi m v bi ca khng kh khi vo my , Xi phong nhit gmhai phn : ht silikgen v du .Trong :

+Ht silikgen dng lc hi m ca khng hk khi vo my

c. Bnh du ph :

-L mt thng hnh tr bng thp t trn np v ni vi thng MBA bng mtng

dn du .y l ni cha lng du n ra do b nng khi my lm vic . m bo chodu trong thng lun y , phi duy tr du mt mc nht nh no .Du trong thngMBA thng qua bnh du ph (hay cn gi l bnh gin du) gin n t do .Ngi ta theodi lng du trong my qua ng ch mc du t bn cnh bnh gin du .

Note: van phng n c lm bng thp thng l hnh tr nghing ,mt uni vi thng MBA, mt u bit bng mt a thu tinh .Nu v mt l do no psut trong thng tng ln t ngt ,a thu tinh s b v ,du theo thot ra ngoi MBA khng b h hng .

Cu 10 : Trnh by cc h thng lm mt ca MBA (onan,onaf)

Khi MBA lm vic tn hao nng lng trong mch t v trong cun dy bin thnhnhit nng t nng cc phn t ca chng , cng hn ch s pht nng ca MBA .

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m bo bn cch in v thi hn phc v ca chng .Do xut hin vn lmmt MBA gi nhit ca n trong gii hn cho php .

C hai cch lm mt :

-Lm mt MBA bng du t nhin (ONAN) : Phn ln MBA c lm mt bng ducch in tun hon do i lu t nhin bn trong thng , thng c v trn , gnsng ,c ng dn hoc b phn tn nhit .

-Lm mt MBA bng qut mt t nhin c qut gi (ONAF) : lm mt cng bc

H thng lm mt kim ny da trn c s lm mt kiu du t nhin c t qut tng cng tn nhit trn b mt. Do vy c th tng cng sut mang ti ca MBA

+H thng lm mt ca MBA T2 c trang b bng 4 ng c xoay chiu,ngun 380V xoay chiu v c cha lm 2 nhm ,mi nhm 2 qut.H thngny c th iu chnh t ng hay bng tay.

Ch bng tay n nt start qut bt u khi ng. Cn mun dng qutta n stop.

Chs t ng khi ng s dng qut c iu khin thng qua cc tipim ca rle kim tra nhit cun dy, nhit du ca MBA v rle dngin.

Nhm 1 c khi ng nhit 750C

Nhm 2 c khi ng nhit 850C

Qut ch t ng dng li khi ph ti khng t nh mc v nhit nh hn750C.

hin th ch lm vic ca qut,s dng cc n ch v tr :qut lm vic (FAN ON ),qut khng lm vic (FAN OFF), h hng trn qut (FAN INFAULT)

Mt s ch vn hnh MBA hai ch ONAN V ONAF:

- ch ONAN :

+Cng sut nh mc 3 pha :30/19/30 MVA

+Dng in nh mc :151/285/72 A

- ch ONAF :

+Cng sut nh mc 3 pha :40/25/40 MVA

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+Dng in nh mc :201/375/962 A

Note : Ngoi ra cng cn mt s phng php lm mt :

-Lm mt tun hon cng bc du v khng kh (OFAF)

+i vi cc MBA cng sut ln hai phng php lm mt ONAN ,ONAF khc th p ng c nn OFAF c th p ng c bng cch s dng h thngvi s lu thng cng bc du v khng kh .Du v khng kh tun hon cngbc ch c lm vic khi cc qut gi v bm du tun hon u hot ng .

-Lm mt bng du v nc (OFWFAN)

c dng cho ccMBA cng sut ln c bit .Bm ly tm c ni vi thngMBA , bm ny ht du nngm t pha trn ca thng ra v y du qua b

phn lm mt. T b phn lm mt du quay tr li phn di ca thng .

Cu 11 : Trnh by s HT mt chiu ,mch t dng trong TBA .Cngdng ,gii thch u khuyt im ca s a.H thng in mt chiu :

H thng in mt chiu trong trm c cung cp bi 36 bnh acquy mi bnh cin p 6V c mt ni tip nhau

Phng thc vn hnh:lm vic theo phng thc ph np thng xuyn ,acquyni vo thanh ci song song vi h thng np,h thng np cung cp ph ti choli ng thi cho caquy mt dng in nh b al dng in t phng

Dng ph np:Dng ph np khng c nh hn tr s tnh theo cng thc sau:

Ip=0,03C/36 Trong Ip:0dng in ph np ,Cm :dung lng nh mc caacquy

Thng s k thut ca HT 1 chiu :

-Nm sn xut 2002

-Nm lp t 2003

-Nm vn hnh 08/10/2003

-Ngun u vo :

+in p 380V

+Cng sut 16,5KVA

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+Thng s cc cquy :

.Tn vn hnh : ACCU

.Kiu accu kh

.Chng loi : S506 /185

.Nh ch to :EXIDE

.Dung lng bnh accu : 185Ah

.in p mi bnh 6V

.S lng bnh acquy 36 bnh

b.Mch t dng trong trm :

My bin p TD4

Tn vn hnh : TD 4

1. Kiu : TCO

2. Kiu lp t : Ngoi tri

3. S my : 2020548

4. Nh ch to : ABB - Vit Nam

5.