Li ni u

Li ni u Trong s nghip cng nghip ho - hin i ho t nc, cng nghip in lc gi vai tr c bit quan trng, bi v in nng l ngun nng lng c dng rng ri nht trong cc nghnh kinh t quc dn. p ng c nhu cu cung cp in ngy cng nhiu v khng ngng ca t nc, ca in nng th cng tc quy hoch v thit k mng li in ang l vn cn quan tm ca ngnh in ni ring v c nc ni chung.

n tt nghip Thit k mng li in gip sinh vin p dng c nhng kin thc hc thc hin c nhng cng vic . Tuy l trn l thuyt nhng phn no gip cho sinh vin hiu c hn thc t ng thi c nhng khi nim c bn trong cng vic quy hoch v thit k mng li in v cng l bc u tin tp dut c nhng kinh nghim, cng c li kin thc cho cng vic sau ny. Vic thit k mng li in phi t uc nhng yu cu v k thut ng thi gim ti a vn u t l yu cu quan trng i vi mi sinh vin lm thit k. Bn n ny bao gm hai phn: Phn th nht c nhim v thit k li in khu vc gm hai nh my nhit in, cung cp in cho 9 ph ti. Phn th hai c nhim v tnh ton thit k ng dy trung p 22 kV. Nh s ch bo, gp ca cc thy c v bn b nn em hon thnh n ny. Tuy n lc rt nhiu nhng do thiu kinh nghim thc t v kin thc cn hn ch nn khng trnh khi nhng thiu st, v vy em rt mong nhn c cc kin nh gi, ch bo ca cc thy c em c m rng, nng cao kin thc.

Qua y em xin chn thnh cm n cc thy c trong b mn H Thng in, c bit l thy gio TS. Nguyn Ln Trng tn tnh gip em trong thi gian va qua. Em rt mong mun s tip tc nhn c s gip ca cc thy c trong sut qu trnh cng tc sau ny. H Ni, ngy 25 thng 05 nm 2007 Sinh vin thc hin

Nguyn Hi ngMc lc

Phn 1: Thit k li in khu vc

Chng 1: Phn tch ngun v ph ti 1 1.1 cc s liu v ngun cung cp v ph ti 1

1.2 Phn tch ngun v ph ti 2

Chng 2: Cn bng cng sut, s b xc nh ch lm vic

ca 2 nh my 3

2.1 Cn bng cng sut tc dng 3

2.2 Cn bng cng sut phn khng 4

2.3 S b xc nh phng thc vn hnh cho 2 nh my 5

Chng 3: La chn in p 7

3.1 Nguyn tc la chn 7

3.2 Chn in p vn hnh 7

Chng 4: Cc phng n ni dy ca mng in 8

4.1 Nhng yu cu chnh i vi mng in 8

4.2 La chn dy dn 8

4.3 Phn vng cung cp in 10

4.4 Tnh ton so snh k thut cc phng n 10

4.4.1 Phng n 1 14

4.4.2 Phng n 2 224.4.3 Phng n 3 26

4.4.4 Phng n 4 31

4.4.5 Phng n 5 38

Chng 5: So snh cc phng n v mt kinh t 455.1 Phng n 1 46

5.2 Phng n 2 48

5.3 Phng n 3 49

Chng 6: Chn my bin p v s ni in chnh 51

6.1 Chn my bin p 51

6.2 Chn s ni in 56

Chng 7: Tnh ton chnh xc cc ch v cn bng cng sut 63

7.1 Ch ph ti cc i 637.2 Ch ph ti cc tiu 86

7.3 Ch sau s c 96

Chng 8: Tnh ton in p ti cc nt v la chn phng thc

iu chnh in p trong mng in 1068.1 Xc nh in p ti cc nt 106

8.2 La chn phng n iu chnh in p 119

Chng 9: Tnh ton gi thnh ti in 1339.1 Tnh ton tn tht in nng 133

9.2 Vn u t ca mng in 134

9.3 Tnh ton gi thnh ti in 135

9.4 Bng tng hp cc ch tiu kinh t - k thut ca mng in 136Phn 2: Thit k ng dy trung p 22 kV

Chng 10: Thit k ng dy trung p 22 kV 138

10.1 S a l thit k ng dy 138

10.2 Cc s liu phc v tnh ton 138

10.3 La chn v tnh ton cc phn t trn ng dy 140 10.4 Lp d ton ton tuyn ng dy 150 Ti liu tham kho1. Nguyn Vn m. Thit k cc mng v h thng in. Nh xut bn khoa hc v k thut, H Ni, 2004, 302 tr.

2. Nguyn Vn m. Mng li in. Nh xut bn khoa hc v k thut, H Ni, 2004, 240 tr.3. Trn Bch. Ti u ho ch ca h thng in. T sch i hc ti chc Bch Khoa H Ni, 1999, 200 tr.

4. Nguyn Cng Hin, Nguyn Mnh Hoch. H thng cung cp in ca x nghip cng nghip th v nh cao tng. Nh xut bn khoa hc v k thut, H Ni, 2005, 430 tr.

5. Trnh Hng Thm, Nguyn Hu Khi, o Quang Thch, L Vn t, Phm Vn Ho, o Kim Hoa. Nh my in v trm bin p - phn in. Nh xut bn khoa hc v k thut, 276 tr.

6. Ng Hng Quang. La chn, tra cu thit b in. Nh xut bn khoa hc v k thut H Ni, 2001.7. Trn Bch. C kh ng dy. Nh xut bn khoa hc v k thut, H Ni, 331 tr.