Nghia -Doanhoanthanh -Cuối Cùng

N TT NGHIP THIT K CUNG CP IN CHO KHU CNG NGHIP

LI NI UCHNG II. V TR A L V VAI TR KINH T6II. C IM PHN B PH TI6III. C IM CNG NGH8 CHNG IIXC NH PH TI TNH TON CA NH MYV KHU CNG NGHIP2..1. TNG QUAN CC PHNG PHP XC NH PH TI TNH TON92.1.1. Khi nim v ph ti tnh ton.92.1.2. Cc phng php xc nh ph ti tnh ton.92.2. XC NH PH TI TNH TON CA NH MY LIN HP DT132.2.1. Xc nh ph ti tnh ton cho phn xng sa cha c kh132.2.2. Xc nh ph ti tnh ton cho cc phn xng khc trong ton nh my.192.2.3. Xc nh ph ti tnh ton ca ton nh my.232.2.4. Biu ph ti ca cc phn xng v nh my.232.3. XC NH PH TI TNH TON CA KHU CNG NGHIP252.3.1. Xc nh ph ti tnh ton ca ton khu cng nghip.252.3.2. Biu ph ti ca khu cng nghip.26CHNG IIITHIT K MNG IN CAO P CHO KHU CNG NGHIP3.1. KHI NIM CHUNG V MNG CAO P CA KHU CNG NGHIP273.2. CHN CP IN P VN HNH CA KHU CNG NGHIP273.3. XUT CC PHNG N S CUNG CP IN283.1. Xc nh tm ph ti ca khu cng nghip.283.2. xut cc phng n s cung cp in.293.4. S B LA CHN THIT B IN313.4.1. Chn cng sut trm bin p trung tm ca khu cng nghip.313.4.2. Chn tit din dy dn.323.4.3. Chn my ct.403.5. TNH TON KINH T K THUT LA CHN PHNG N 442.5.1. Phng n i dy 1452.5.2. Phng n i dy 2493.6. THIT K CHI TIT CHO PHNG N LA CHN532.6.1. Chn dy dn 110kV t h thng v khu cng nghip532.6.2. Tnh ngn mch cho mng cao p532.6.3. Chn v kim thit b in cho mang cao p ca khu cng nghip572.6.4. Kim tra cc thit b in pha h p ca MBATT chn s b582.6.5. S nguyn l mng cao p ca khu cng nghip60CHNG IVTHIT K MNG IN CAO P CHO NH MY LIN HP DT4.1. T VN .614.2. Cc phng n cung cp in cho nh my.614.2.1. Phng n v cc trm bin p phn xng 614.2.2. Chn cc my bin p phn xng .624.2.3 Xc nh v tr cc trm bin p phn xng 634.3.PHNG N CUNG CP IN CHO CC TBAPX644.3.1.Cc phng n cung cp in cho trm bin p phn xng.644.3.2. Xc nh v tr t trm bin p trung gian , trm phn phi trung tm ca nh my:.664.3.3. La chn phng n ni dy ca mng cao p.674.4. TNH TON KINH T - K THUT CHO CC PHNG N704.4.1. Phng n 1.704.4.2.Phng n 2.774.4.3.Phng n 3.794.4.4.Phng n 4.834.5. THIT K CHI TIT MNG CAO P CA NH MY:874.5.1.Chn dy dn t trm bin p trung gian v trm phn phi trung tm874.5.2. Chn cp cao p v h p ca nh my874.5.3. Tnh ton ngn mch la chn cc thit b in874.5.4.La chn v kim tra cc thit b in914.6.Thuyt minh v vn hnh s 1004.6.1. Khi vn hnh bnh thng.1004.6.2. Khi b s c1004.6.3. Khi cn sa cha nh k.100CHNGVTHIT K MNG H P PHN XNGSA CHA C KH5.1. NH GI V PH TI CA PHN XNG SA CHA C KH1015.2.La chn s cung cp in cho phn xng :1015.2.1. La chn s cung cp in cho phn xng:1015.2.2. Chn v tr t ng lc v phn phi:1045.2.3. S i dy trn mt bng v phng thc lp t cc ng cp:1045.3. La chn t phn phi v t ng lc.1045.3.1. Nguyn tc chung:1045.3.2. Chn t phn phi1045.3.3. Chn t ng lc v dy dn t t ng lc ti cc thit b1065.4.Tnh ngn mch pha h p ca PXSCCK kim tra cp v ATM.1095.4.1.Cc thng s ca s thay th :1105.4.2.Tnh ton ngn mch v kim tra cc thit b chn :111CHNG VITHIT K CHIU SNG CHO PHN XNGSA CHA C KH6.1. MC CH V TM QUAN TRNG CA CHIU SNG:1156.2. H thng chiu sng1156.2.1. Cc hnh thc chiu sng:1156.2.2. Chn h thng chiu sng1156.2.3.Chn loi n chiu sng1156.2.4. Chn ri cho cc b phn1166.3. Tnh ton chiu sng :1166.4. Thit k mng in chiu sng.118CHNG VIITNH TON B CNG SUT PHN KHNG NNG CAO H S CNG SUT CA NH MY7.1. T VN 1227.2. CHN THIT B B1237.3. XC NH V PHN B DUNG LNG B.1237.3.1.Xc nh dung lng b1237.3.2. Phn b dung lng b cho cc trm bin p phn xng123CHNG VIIITHIT K TRM BIN P B38.1. S nguyn l v la chn cc phn t c bn ca trm1308.1.1. Chn my bin p B31328.1.2. Chn thit b pha cao p :132.8.1.3. Chn thit b h p.132

8.2. Thit k h thng ni t cho trm bin p phn xng .1358.2.1. H s ni t ca trm bin p phn xng B3.1358.2.2. Tnh ton h thng ni t:1358.3. Kt cu trm v s b tr cc thit b trong trm138 TI LIU THAM KHO139

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 Bch Khoa H Ni ang o to mt i ng ng o cc k s h thng in. Trong nhim v thit k n tt nghip, em c phn cng v phn thit k cung cp in. c s hng dn, ging dy nhit tnh ca cc thy, c gio trong b mn v c bit l ca thy Bch Quc Khnh , 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 Bch Quc Khnh cng cc thy c gio khc trong b mn H Thng in. H Ni , ngy 10 thng 5 nm 2007 Sinh vin thc hin: Phan Tun Ngha

CHNG IGII THIU CHUNG V KHU CNG NGHIP I.V TR A L V VAI TR KINH T:

Khu cng nghip c xy dng trn a bn tnh ng Nai, trn mt din tch rng ln gm c 5 nh my v mt khu dn c. Cc nh my u l nhng nh my cng nghip nh v dn dng, c cng sut va v nh, nhng c tm quan trng kh ln trong nn kinh t quc dn. Do ta xp cc nh my v khu dn c vo h loi mt, cn c cung cp in lin tc v an ton.

II. C IM PHN B PH TI

Ph ti in ca khu cng nghip c cp in t ngun h thng c khong cch 15 km qua ng dy trn khng nhm li thp vi cp in p l 35 kV hoc 110 kV. Dung lng ngn mch v pha h p ca trm bin p khu vc 400 MVA. Thi gian xy dng cng trnh l 1nm, sut trit khu l 12%/nm, thi gian vn hnh cng trnh l 30 nm.Bng 1.1 Ph ti khu cng nghip

STTTn phn xngCng sut t (kW)Tmax (h)

1Nh my ch to pht ng t xe my100004000

2Nh my ch bin g55003500

3Nh my ng70005000

4Nh my ch bin nng sn40005000

5Nh my dtTheo tnh ton5000

6Khu dn c50003000

Bng 1.2 Ph ti ca nh my lin hp dtSTTTn phn xngCng sut t( kW)Din tch

1Ban qun l phng thit k25900

2Phn xng luyn kim mu1200843,7

3Phn xng luyn kim en1220847,8

4Phn xng sa cha c khTheo tnh ton1406

5Kho vt liu201012,5

S mt bng nh my

III.C IM CNG NGH

Khu cng nghip bao gm mt khu lin hp, c xy dng gn vi khu dn c to iu kin thun li cho sn xut v sinh hot va tit kim vn u t xy dng mng in cho khu cng nghip. y u l nhng ngnh cng nghip nh v cc nh my hot ng c lp.CHNG II

XC NH PH TI TNH TON CA

KHU CNG NGHIP1. TNG QUAN V CC PHNG PHP XC NH PH TI TNH TON1.1 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.

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. 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.1.2Cc 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 c dng ch yu l:a. Phng php xc nh ph ti tnh ton theo cng sut t v h s nhu cu :Mt cch gn ng c th ly P = PmKhi

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

Phng php ny c u im l n gin, thun tin. Nhc im ca phng php ny l km chnh xc. Bi h s nhu cu tra trong s tay l mt s liu c nh cho trc, khng ph thuc vo ch vn hnh v s thit b trong nhm.b. Phng php xc nh ph ti tnh ton theo sut ph ti trn mt n v din tch sn xut :

Cng thc tnh :

Trong :

- po : sut ph ti trn mt n v din tch sn xut ( W/m2 ). Gi tr po c tra trong cc s tay.

- F : din tch sn xut ( m2 )

Phng php ny ch cho kt qu gn ng khi c ph ti phn b ng u trn din tch sn xut, nn n c dng trong giai on thit k s b, thit k chiu sng.c.Phng php xc nh ph ti tnh ton theo sut tiu hao in nng cho mt n v thnh phm :

Cng thc tnh ton :

Trong :

M : S n v sn phm c sn xut ra trong mt nm

Wo : Sut tiu hao in nng cho mt n v sn phm ( kWh )

Tmax : Thi gian s dng cng sut ln nht ( gi )

Phng php ny c dng tnh ton cho cc thit b in c th ph ti t bin i nh : qut gi, my nn kh, bnh in phn Khi ph ti tnh ton gn bng ph ti trung bnh v kt qu tnh ton tng i chnh xc.d.Phng php xc nh ph ti tnh ton theo cng sut trung bnh v h s cc i

Cng thc tnh :

Trong :

n : S thit b in trong nhm

Pmi : Cng sut nh mc thit b th i trong nhm

Kmax : H s cc i tra trong s tay theo quan h

Kmax = f ( nhq, Ksd )

nhq : s thit b s dng in c hiu qu l s thit b gi thit c cng cng sut v ch lm vic, chng i hi ph ti bng ph ti tnh ton ca nhm ph ti thc t.( Gm c cc thit b c cng sut v ch lm vic khc nhau )Cng thc tnh nhq nh sau :

Trong :

Pm : cng sut nh mc ca thit b th i

n : s thit b c trong nhm

Khi n ln th vic xc nh nhq theo phng php trn kh phc tp do c th xc nh nhq mt cch gn ng theo cch sau :

+ Khi tho mn iu kin :

v Ksd 0,4 th ly nhq = n

Trong Pm min, Pm max l cng sut nh mc b nht v ln nht ca cc thit b trong nhm

+ Khi m > 3 v Ksd 0,2 th nhq c th xc nh theo cng thc sau :

+ Khi m > 3 v Ksd < 0,2 th nhq c xc nh theo trnh t nh sau :.Tnh n1 - s thit b c cng sut 0,5Pm max

.Tnh P1- tng cng sut ca n1 thit b k trn :

.

Tnh n* = ; P* = P : tng cng sut ca cc thit b trong nhm :

Da vo n*, P* tra bng xc nh c nhq* = f (n*,P* )

Tnh nhq = nhq*.n

Cn ch l nu trong nhm c thit b tiu th in lm vic ch ngn hn lp li th phi quy i v ch di hn khi tnh nhq theo cng thc :

Kd : h s ng in tng i phn trm .Cng cn quy i v cng sut 3 pha i vi cc thit b dng in 1 pha.

+ Nu thit b 1 pha u vo in p pha :

Pqd = 3.Pmfa max+ Thit b mt pha u vo in p dy :

Pqd = .PmCh : Khi s thit b hiu qu b hn 4 th c th dng phng php n gin sau xc nh ph ti tnh ton :

+ Ph ti tnh ton ca nhm thit b gm s thit b l 3 hay t hn c th ly bng cng sut danh nh ca nhm thit b :

n : s thit b tiu th in thc t trong nhm.Khi s thit b tiu th thc t trong nhm ln hn 3 nhng s thit b tiu th hiu qu nh hn 4 th c th xc nh ph ti tnh ton theo cng thc :

Trong : Kt l h s ti . Nu khng bit chnh xc c th ly nh sau :

Kt = 0,9 i vi thit b lm vic ch di hn .Kt = 0,75 i vi thit b lm vic ch ngn hn lp li.e.Phng php xc nh ph ti tnh ton theo cng sut trung bnh v h s hnh dng

Cng thc tnh : Ptt = Khd.Ptb Qtt = Ptt.tg

Stt =

Trong Khd : h s hnh dng ca th ph ti tra trong s tay

Ptb : cng sut trung bnh ca nhm thit b kho st

A : in nng tiu th ca mt nhm h tiu th trong khong thi gian T.

f.Phng php xc nh ph ti tnh ton theo cng sut trung bnh v lch trung bnh bnh phng

Cng thc tnh : Ptt = Ptb .

Trong : : h s tn x.

: lch ca th ph ti khi gi tr trung bnh.

Phng php ny thng c dng tnh ton ph ti cho cc nhm thit b ca phn xng hoc ca ton b nh my. 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 h thng ang vn hnh.

g. 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 :

In = Ik max + Itt Ksd.Im max

Trong :

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.2. XC NH PH TI TNH TON CA NH MY LIN HP DT2.1.Xc nh ph ti tnh ton ca phn xng sa cha c kh2.1.1Phn loi v phn nhm ph ti in trong phn xng sa cha c kh.

- 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 :

=

- 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.

- 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 sau :

+ 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 2-1 : Bng phn nhm thit b in ca phn xng sa cha c kh

TTTn nhm v tn thit bK hiu trn mt bngS lngCng sut t

( kW)Ton b(kW)

B phn c ng

1My ca kiu ai1111

2Bn22

3Khoan bn310.650.65

4My p tay41

5My mi th512.82.8

6My khoan ng62,82.82.8

7My xc712.82.8

8My mi trn vn nng812.82.8

9My bo ngang914.54.5

10My phay rng1014.54.5

11My phay rang vn nng1117,87,8

12My tin ren1218.18.1

13My tin ren1311010

14My tin ren1411414

15My tin ren1514,54,5

16My tin ren1611010

17My tin ren1712020

Cng theo nhm 11595,6

B phn lp rp

18My khoan ng1110.850.85

19Cu trc12124,224,2

20Bn lp rp 131

21Bn171

22My Khoan hn1810.850.85

23My cn bng tnh191

24Bn201

25My p tay211

26B du tang nhit2212,52,5

27My co2811

28B ngm nc nng29

29 B ngm Natri Hidroxit30

30My mi th3112.82.8

Cng theo nhm 2632,3

B phn hang hi

31My ct nn lin hp3211,71,7

32Bn hn331

33My Mi ph3412,82,8

34Qut l rn3511.51.5

35L trn361

36My p tay371

37Bn381

38My khoan ng3910.850.85

39Bn nn391

40Bn nh u401

Cng theo nhm 346.85

B phn sa cha in

41B ngm dung dch kim41133

42B ngm nc nng42113

43Bn431

44Dao ct vt liu in441

45My p tay451

46My cun dy4711,21,2

47My cun dy47111

48B ngm tm c tang nhit48113

49T xy49133

50My khoan hn5010,650,65

51My cn bng tnh51

52My mi th5212,82,8

53Bn th nghim thit b in53177


B phn c ng

54Dao ct c tay on541

55B kh du m5513

56L in luyn khun5615

57L in nu chy babit57110

58L in m thic5813,5

59 lt babit591

60Qut l c ng6011,5

61Bn 61

62My khoan hn6210.65

63Bn nn631

64My un cc tm mng6411,7

65My mi ph6512.8

66My hn im66125


Bung np in

67T np acqui671

68Gi thit b681

69Chnh lu selenmium6910.6

70Bn701

Cng theo nhm 610.6

2.1.2 Xc nh ph ti tnh ton ca cc nhm ph ti

( Cc g tr ksd, cos v kmax tra ph lc .)a. Tnh ton cho nhm 1

Bng 2-2: Danh sch thit b thuc nhm 1

TTTn nhm v tn thit bK hiu trn mt bngS lngCng sut t

( kW)Cngsut ton b

(kW)

B phn c ng

1My ca kiu ai1111

2Bn220

3Khoan bn310.650.65

4My p tay41

5My mi th512.82.8

6My khoan ng612.82.8

7My bo ngang714,54,5

8My xc812.82.8

9My mi trn vn nng912,82,8

10My phay rang1014,54,5

11My phay vn nng1117,87,8

12My tin ren1218.18.1

13My tin ren1311010

14My tin ren1411414

15My tin ren1514,54,5

16My tin ren1611010

17My tin ren1712020


Tra ph lc PL 1.1 TL1 tm c ksd = 0,3 ; cos = 0,6 ta c :

n = 15 ; n1 = 4

n* = = = 0.26

P* = = = 0,56 Tra ph lc 1.4 tm c nhq* = 0,62S thit b dng in hiu qu nhq = nhq*.n = 11Tra h lc 1.5 TL1 vi ksd = 0,15 v nhq = 10 tm c kmax = 1,56Ph ti tnh ton nhm 1 :

Qtt = Ptt.tg = 44,7.1,33 = 59,4 (kVAR)

Stt = = (kVA)

Tnh ton tng t cho cc nhm ph ti cn li .

Ta c bng tng kt ph ti in phn xng sa cha c kh

Bng 2.3 Kt qu phn nhm ph ti ca phn xng sa cha c kh

Tn nhm v thit bK hiu trn bn vS lngPm, kW

KsdCos/ tgnhqKmax

Ptt

(kW)Qtt(kVAr)Stt(kVA)

123456789101112

B phn c ng

My ca kiu ai1110.30,6/1,33

Khoan bn110.650,30,6/1,33

My mi th312,80,30,6/1,33

My khoan ng412,80,30,6/1,33

My bo ngang514,50,30,6/1,33

My xc612,80,30,6/1,33

My mi trn vn nng712,80,30,6/1,33

My phay rang814,50,30,6/1,33

My phay vn nng917,80,30,6/1,33

My tin ren1018.1

My tin ren11114

My tin ren1214,5

My tin ren13110

My tin ren14120

Cng theo nhm 11595,630,70,30,6/1,33111,5644,759,474,5


KsdCos/ tgnhqKnc

Ptt


B phn lp rp

My khoan ng10,850,30,6/1,33

Cu trc124,20,30,6/1,33

My khoan bn10,850,30,6/1,33

B du c tang nhit12.50,30,6/1,33

My co110,30,6/1,33

My mi th12,80,30,6/1,33

Cng theo nhm 2632,328,40,150,6/1,330,39,6612,816

B phn hn hi

My nn ct lin hp11,70.30,6/1,33

My mi ph12,80,30,6/1,33

My khoan ng10.850,30,6/1,33

Qut l rn11,50.30.6/1,33

Cng theo nhm 346,853,290,30,6/1,330,32,0552,73,39


KsdCos/ tgnhqKmax

Ptt


B phn sa cha in

B ngm dung dch kim130.30,6/1,33

B ngm nc nng130.30,6/1,33

My cun dy11,20.30,6/1,33

My cun dy110,30,6/1,33

B ngm c tm tang nhit130,30,6/1,33

T xy130,30,6/1,33

My khoan bn10,650,30,6/1,33

My mi th12,80,30,6/1,33

Bn th nghim thit b in170,30,6/1,33

Cng theo nhm 4924,6510,70,30,6/1,330,671,881215,9620

B phn c ng

B kh du m130,30,6/1,33

L in luyn khun150,30,6/1,33

L in nu chy babit1100,30,6/1,33

L in m thic13,50,30,6/1,33

Qut l c ng11,50,30,6/1,33

My khoan hn10,650,30,6/1,33

My un cc tm mng1170.30,6/1,33

My mi ph12,80,30.6/1,33

My hn im1250,30,6/1,33

Cng theo nhm 5968,4538,460,30,6/1,330,42,14344556


KsdCos/ tgnhqKnc

Ptt


Bung np in

Chnh lu selenmium10,60,30,6/1,33

Cng theo nhm 510,610,30,6/1,330,30,180,230,29

2.1.3. 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:

Pcs = po.F

Trong :

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 = 14 W/m2Ph ti chiu sng ca phn xng :

Pcs = po.F = 14.1406= 19,684 (KW)

Qcs = Pcs.tgcs = 0 (n si t coscs = 0 )

2.1.4. Xc nh ph ti tnh ton ton phn xng

* Ph ti tc dng ( ng lc ) ca ton phn xng :

.

Trong Kdt l h s ng thi ca ton phn xng , ly Kdt = 0,9* Ph ti phn khng ca phn xng :

* Ph ti ton phn ca phn xng k c chiu sng:

Pttpx = Pdlpx + Pcspx =92,3+19,684 = 111,984 ( kW)

Qttpx = Qdlpx =122,481 ( kVAr )

Sttpx = =

EMBED Equation.DSMT4

Cospx = =

2.2. Xc nh ph ti tnh ton ca cc phn xng khc trong ton 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.

2.2.1 Phng php xc nh ph ti tnh ton theo cng sut t v h s nhu cu :

Mt cch gn ng c th ly P = PmKhi

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

2.2.2 Xc nh ph ti tnh ton ca cc phn xng

Vic tnh ton cho cc phn xng l hon tn ging nhau . Ta tnh mt phn xng mu. Ly phn xng mc lm v d:Tnh ton cho ban qun l v phng thit kCng sut t 25 kW, din tch 900 m2;

Tra ph lc 1.3 TL1 ta c: Knc = 0,3 ; cos = 0,6 ; tg = 1,33 . y ta dng n si t c coscs =0,85 ; tgcs = 0

Tra ph lc 1.2 ta c sut chiu sng po = 14 W/m2

Cng sut tnh ton ng lc

Pdl = Knc.P = 0,3.25 = 7,5 kW

Qdl = Pdl.tg = 7,5.1,33 = 9,975kVAr

Cng sut tnh ton chiu sng:

Pcs = po.F = 14.900 = 12,6 kW

Qcs = Pcs.tgcs = 10,5.0 = 0 kVArCng sut tnh ton ca phn xng:

Ptt = Pdl + Pcs = 7,5 + 12,6 =20,1kW

Qtt = Qdl + Qs = 9,975 + 0 =9,975 kVArStt =

Tnh ton tng t cho cc phn xng cn li. Ring i vi khu nh vn phng ta chn n hunh quang c coscs =0,85 ; tgcs = 0,62 cn li ta dng n si t c coscs = 1; tgcs = 0. Ta c bng tng kt sau y:Bng 2.4 - Kt qu tnh ton ph ti cc phn xng

`Tn Phn xngP (kW)KncCos/ tgF

(m2)Po (W/m2)Pdl

(kW)Pcs (kW)Ptt

( kW)Qtt (kVAr)Stt,

( kVA)

1Ban qun l v phng thit k 250,70,8900141412,626,610,528,59

2Phn xng luyn kim mu12000,60,6843,751472011,81731,81957,61287

3Phn xng luyn kim en12200.60.6847.51473211,8743,8973,561225

4Phn xng sa cha c kh0,30.7314061492,319,685111,984122,481153

5Kho vt liu200,60.61012,5141214,17526,17515,9630,6

Tng1640,32080,1

2.3. Xc nh ph ti tnh ton ca ton nh my * Ph ti tnh ton tc dng ca ton nh my:

Pttnm = Kdt.

Trong : Kdt h s ng thi ly bng 0,85

Pttpxi ph ti tnh ton ca cc phn xng d xc nh c trnPttnm = 0,85. 1640,3 = 1394,255 ( KW)Ph ti tnh ton phn khng ca ton nh my :

Qttnm = Kdt. = 0,85.2080 = 1768 (KVAr)Ph ti tnh ton ton phn ca ton nh my :

Sttnm =

H s cng sut ca ton nh my :cosnm =

2.4. Biu ph ti ca cc phn xng v nh my

2.4.1Tm ph ti in

Tm ph ti in l im thho mn iu kin momen ph ti t gi tr cc tiu 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:

; ;

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..

2.4.2 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. 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 :

Trong : m l t l xch , y chn m = 3 kVA/ mm2Gc ca ph ti chiu sng nm trong biu dc xc nh theo cng thc sau:

Kt qu tnh ton Ri v csi ca biu ph ti cc phn xng c ghi trong bng sau:

Bng 2.5- Bn knh R v gc chiu sng ca biu ph ti cc phn xngTTTn phn xngPcs, kWPtt, kWStt, ,kVATm ph tiR,mmcso

x, mmy, mm

1Ban qun l v phng thit k12,626,628,597261,74170

2PX luyn kim mu11,817311287234411,685,81

3PX luyn kim en11,8743,8122523711,45,71

4PX sa cha c kh 19,68111,98415354264,0946,3

5Kho vt liu14,17526,175305571,78194,95

Biu ph ti ca ton nh my

2.3. XC NH PH TI TNH TON CA KHU CNG NGHIP

2.3.1. Xc nh ph ti tnh ton ca ton khu cng nghip

Tnh ton tng t nh cho cc phn xng vi h s ng thi ca khu cng nghip ly bng 0,8 ta c kt qu Bng 2.6 Kt qu tnh ton ph ti ca ton nh my

TTTn nh myP, kWKnccosPtt, kWQtt, kVArStt, kVA

1NM ph tng t xe my100000.230.6823002479.983382.35

2Nh my ch bin g55000.190.6810451126.771536.76

3Nh my ng70000.330.723102356.673300.00

4Nh my ch bin nng sn40000.40.716001632.332285.71

5Nh my dt0.734158.713950.055735.66

6Khu dn c50000,80,8400030005000

Tng15413,7114545,821240.49

Ph ti tnh ton tc dng ca khu cng nghip

Ptt kcn = Kdt kcn.Ptt = 0,75. 15413,71 = 11560,28 KW

Ph ti tnh ton phn khng ca khu cng nghip

Qtt kcn = Kdt kcn. Qtt = 0,75. 14545,8 = 10909,35 KVAr

Ph ti tnh ton ton phn ca khu cng nghip

Sttkcn =

2.3.2. Xc nh tm ph ti khu cng nghip v v biu ph ti

Tng t ta xc nh c bn knh v ta tm ph ti ca cc nh my nh sau.

Bng 2.7- Ta tm ph ti v bn knh R ca ph ti ca cc nh my.

TTTn nh myX(mm)Y(mm)R (mm)Stt (kVA)

1Nh my ch to ph tng t xe my457418.943382.35

2Nh my ch bin g1546112.771536.76

3Nh my ng751318.713300.00

4Nh my ch bin nng sn1302715.572285.71

5Nh my dt48.540.524.675735.66

6Khu dn c857023.035000

biu ph ti ca khu cng nghip

CHNG III THIT K MNG IN CAO P CA KHU CNG NGHIP

3.1. KHI NIM MNG CAO P KHU CNG NGHIP

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 khu cng nghip khng xt trong cc nh my.

3.2 .CHN CP IN P VN HNHCp in p vn hnh l cp in p lin kt h thng cung cp in ca khu cng nghip 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.

Cng thc kinh nghim chn cp in p truyn ti:

.

Trong :

P cng sut tnh ton ca nh my ( kW)

l khong cch 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. St = S0.(1+.t)

Trong

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= 10 nm - h s gia tng ca ph ti . ly = 0.05Ta c :

Pt = P0.(1 + .t) = 1640,3.(1 + 0,05.10) = 2460,45 kW

Qt = Q0.(1 + .t) = 2080.(1+0,05.10) = 3120 kVAr

St = S0(1+.t) = 27.(1+ 0,05.10) = 40,5 kVA

Cp in p vn hnh xc nh theo cng thc kinh nghim.

T kt qu tnh ton ta chn cp in p 110 kV lin kt t h thng in ti khu cng nghip.

3.3. XUT CC PHNG N CP IN

3.3.1Tm ph ti in

Tm ph ti in l im thho mn iu kin momen ph ti t gi tr cc tiu 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:

; ;

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.Tm ph ti in ca khu cg nghip:

Tm ph ti ca khu cng nghip l Mo(xo;yo) = Mo(77,06; 58,54 )3.3.2 xut cc phng n v s cung cp in:

Cc ch tiu kinh t k thut ca mng in ph thuc rt nhiu vo s ca n. V vy cc s cung cp in phi c chi ph nh nht, m bo tin cy cung cp in cn thit v cht lng in nng yu cu ca cc h tiu th, an ton trong vn hnh kh nng pht trin trong tng lai v tip nhn cc ph ti mi.Ta xut 2 kiu s ni in chnh nh sau:

a. Kiu i dy 1 :

b. Kiu i dy 2:

3.4. S B LA CHN THIT B IN

3.4.1. Chn cng sut trm bin p trung tm ca khu cng nghip.

Cc nh my trong khu cng nghip c xp vo h loi I vi ph ti tnh ton ca c khu cng nghip c k n s pht trin trong 10 nm ti l:

SttCN(0)= 15896,1 kVA.

SttCN(10) = 23842,65 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 , kVA

- Ch s c: SmBA , 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).

Vy:

SmBA kVA

SmBA kVA

Tra bng bng 16 TL2 ta chn c loi my bin p 3 pha 2 cun dy do Vit nam ch to nhn hiu TDH-25000/110 cho c 3 cp in p trung p 35kV, 22kV, 10kV ch to theo n t hng thng s nh sau:

Tn trm TBATTSdm

[kVA]Uc/Uh [kV](P0

[kW](Pn

[kW]Un

[%]I0

[%]

TDH-25000/11025000115/(35-22-11)2912010,50,8

3.4.2 Chn thit din dy dn ng dy cung cp t trm bin p trung tm ca khu cng nghip v ti cc 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 cc nh my.

Cc nh my trong khu cng nghip 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 :

Dng in lm vic chy trong dy.

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:

(Ubtcp=5%.Udm

(Usccp=10%.Udm

Bng 3.1. Thng s cc nh my trong khu cng nghip

TTTn nh myPtt(10)

(kW)Qtt(10)

(kVAr)Stt(10)

(kVA)Tmax(h)Jkt

(A/mm2)

1Nh my ch to ph tng t xe my3450.003719.975073.5340001,1

2Nh my ch bin g1567.501690.162305.1535001,1

3Nh my ng3465.003535.014950.0050001,1

4Nh my ch bin nng sn2400.002448.493428.5750001,1

5Nh my dt6238.075925.078603.4950001,1

6Khu dn c6000.004500.007500.0030001,1

3.4.2.1. Phng n i dy 1Vi cp in p trung p UTA = 35 kV

Chn dy dn t TBATT n nh my ch to ph tng t xe my- Dng in tnh ton chy trn mi dy dn:

Ilvmax =

- Tit din kinh t:

Ftt =

Chn dy nhm li thp tit din 50 mm2. Tra bng 2 sch li in 1 dy dn AC-50 c Icp = 210A.

- Kim tra dy dn khi s c t 1 dy:

Isc=2.Ilvmax = 2.41,85= 83,69 A < Icp = 210A

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-50 c khong cch trung bnh hnh hc l Dtb=2m, vi cc thng s k thut r0 = 0,65(/km; x0 = 0,392 (/km; l = 10,48 km.

(U% = 1,58% < (Ucp% = 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-50.

Chn dy dn t TBATT n cc nh my cn li trong khu CNTng t vi cc ng dy cn li ta c kt qu bng 3.2:

Vi cp in p trung p UTA = 22 kV

Vi cp in p trung p 22kV ta cng tin hnh tng t kt qu bng 3.3:

Vi cp in p trung p UTA = 10 kV

Ta nhn thy vi cp in p trung p l 10 kV th phi dng rt nhiu dy dn khng ph hp vi thit k thc t nn ta loi phng n c cp in p trung p l 10 kV.

3.4.2.2. phng n i dy 2

Tnh ton tng t nh phng n 1 vi 2 cp in p trung p 35kV, 22kVkt qu cho cc bng: bng 3.5; bng 3.6 .

Bng 3.2. Thng s ng dy trn khng cp in p 35kV PA1ng dyPtt

(kW)Qtt

(kW)Stt(kVA)l

(km)LIlvmax(A)Ftkt(mm2)DyIsc(A)Icp(A)r0((/km)x0((/km)(Ucp

(%)

TBA-NMch to ph tng t xe my3450.003719.975073.5310.48241.8538.04AC-5083.692100.6500.3921.58

TBA-Nh my ch bin g1567.501690.162305.1519.89219.0117.28AC-5038.032100.6500.3921.37

TBA-Nh my ng3465.003535.014950.0010.30240.8337.12AC-5081.652100.6500.3921.53

TBA-Nh my ch bin nng sn2400.002448.493428.5717.82228.2825.71AC-5056.562100.6500.3921.83

TBA-Nh my dt6238.075925.078603.496.03270.9664.51AC-70141.922650.4600.3821.26

TBA-Khu dn c6000.004500.007500.009.98261.8656.24AC-70123.722650.4600.3821.82

Bng 3.3. Thng s ng dy trn khng cp in p 22kV PA1

ng dyPtt

(kW)Qtt

(kW)Stt(kVA)l


(%)



TBA-Nh my ng3465.003535.014950.0010.30264.9559.05AC-70129.902650.4600.3823.13


TBA-Nh my dt6238.075925.078603.496.032112.89102.63AC-120225.783800.2700.3652.40

TBA-Khu dn c6000.004500.007500.009.98298.4189.47AC-95196.823300.3300.3713.76


ng dyPtt

(kW)Qtt

(kW)Stt(kVA)l


(%)



TBA-Nh my ng3465.003535.014950.0010.30647.6343.30AC-15057.162650.2100.3583.42


TBA-Nh my dt6238.075925.078603.496.03682.7975.26AC-12099.343800.2700.3683.88

TBA-Khu dn c6000.004500.007500.009.98672.1765.61AC-15086.604450.2100.3584.78

Bng 3.5. Thng s ng dy trn khng cp in p 35kV PA2ng dyPtt

(kW)Qtt

(kW)Stt(kVA)l


(%)


NMch bin nng sn -NM ch bin g1567.501690.162305.1511.59219.0117.28AC-5038.032100.6500.3920.80

TBA-Nh my ng3465.003535.014950.0010.30240.8337.12AC-5081.652100.6500.3921.53


TBA-Nh my dt6238.075925.078603.496.03270.9664.51AC-70141.922650.4600.3821.26

TBA-Khu dn c6000.004500.007500.009.98261.8656.24AC-70123.722650.4600.3821.82


ng dyPtt

(kW)Qtt

(kW)Stt(kVA)l


(%)


NMch bin nng sn -NM ch bin g1567.501690.162305.1511.59230.2527.50AC-5060.492100.6500.3922.01

TBA-Nh my ng3465.003535.014950.0010.30264.9559.05AC-70129.902650.4600.3823.13


TBA-Nh my dt6238.075925.078603.496.032112.89102.63AC-120225.783800.2700.3682.41

TBA-Khu dn c6000.004500.007500.009.98298.4189.47AC-95196.823300.3300.3763.79

3.4.3 Chn my ct.

My ct in l thit b ng ct mch in cao p (>1000V). Ngoi nhim v ng ct ph ti phc v cng tc vn hnh, my ct cn c chc nng ct dng ngn mch bo v cc phn t ca h thng in. My ct c chn s b theo cc iu kin sau:

+ in p nh mc: UdmMC ( Udmm

+ Dng in nh mc: IdmMC (Icb vi Icb=

Trong qu tnh chn s b MC ta ch chn MC pha trung p.

3.4.3.1. Phng n i dy 1Vi cp in p 35 kV.*) Chn my ct pha h MBATT:

+ in p nh mc: Udmm=35kV

+ Dng cng bc qua my ct Icb= A

Chn my ct SF6 do Schneider ch to loi F400 vi thng s cho bng 3.7:*) Chn my ct trn mch ng dy ni vi nh my nh my ch to ph tng t xe myChn my ct SF6 do Schneider ch to loi F400 vi thng s cho bng 3.7:+ in p nh mc: UdmMC = 36 kV ( Udmm=35kV

+ Dng in nh mc: IdmMC =1250A (Icb= A

*) Tng t vi cc mch ng dy cn li kt qu trong bng 3.7.

Bng 3.7. Chn my ct cp in p 35 kV

Chn my ct SF6 do Schneider ch to

Cc l ng dyIcb(A)SLLoi MCUdm(kV)Idm

(A)Ictdm(kA)In/tn

(kA)I(kA)

Pha h TBATT393.303F4003612502525/140

TBA_NM ch to ph tng t xe my83.695F4003612502525/140

TBA-Nh my ch bin g38.035F4003612502525/140

TBA-Nh my ng81.655F4003612502525/140

TBA-Nh my ch bin nng sn56.565F4003612502525/140

TBA-Nh my dt141.925F4003612502525/140

TBA_Khu dn c123.725F4003612502525/140

Tng s my ct33

Vi cp in p 22 kV.Bng 3.8. Chn my ct cp in p 22 kV



(A)Ictdm(kA)In/tn

(kA)I(kA)

Pha h TBATT625.71324GI-E16241250161640

TBA_NM ch to ph tng t xe my133.15524GI-E16241250161640

TBA-Nh my ch bin g60.49524GI-E16241250161640

TBA-Nh my ng129.90524GI-E16241250161640

TBA-Nh my ch bin nng sn89.98524GI-E16241250161640

TBA-Nh my dt225.78524GI-E16241250161640

TBA_Khu dn c196.82524GI-E16241250161640

Tng s my ct33

3.4.3.2. Phng n i dy 2

Ta tin hnh chn s b nh MC nh phng n 1:

Vi cp in p 35 kV.Bng 3.9. Chn my ct cp in p 35 kV



(A)Ictdm(kA)In/tn

(kA)I(kA)

Pha h TBATT393.303F4003612502525/140

TBA_NM ch to ph tng t xe my83.695F4003612502525/140

NM ch bin nng sn-NM ch bin g38.035F4003612502525/140

TBA-Nh my ng81.655F4003612502525/140

TBA-Nh my ch bin nng sn94.575F4003612502525/140

TBA-Nh my dt141.925F4003612502525/140

TBA_Khu dn c123.725F4003612502525/140

Tng s my ct33

Vi cp in p 22 kVBng 3.10. Chn my ct cp in p 22 kV



(A)Ictdm(kA)In/tn

(kA)I(kA)

Pha h TBATT625.71324GI-E16241250161640

TBA_NM ch to ph tng t xe my133.15524GI-E16241250161640

NM ch bin nng sn-NM ch bin g60.49524GI-E16241250161640

TBA-Nh my ng129.90524GI-E16241250161640

TBA-Nh my ch bin nng sn50.15924GI-E16241250161640

TBA-Nh my dt225.78524GI-E16241250161640

TBA_Khu dn c196.82524GI-E16241250161640

Tng s my ct37

Nhn xt: T tnh ton trn ta thy vi cp in p trung p l 10 KV th s dng rt nhiu dy dn do s dng nhiu my ct nn rt tn km v mt kinh t v khng ph hp trong thit k thc t ngoi ra tn tht in p trong cc phng n c cp in p 10 KV cng l rt ln do ta s loi cc phng n ny ra. Ta s ch so snh cc phng n c cp in p trung p l 22 kV va 35 kV tm phng n ti u.

3.5. TNH TON KINH T K THUT LA CHN PHNG N THIT K

Nhim v ca ngi thit k l chn c phng n cung cp in tt nht, va tha mn cc yu cu k thut ra li va r v vn u t v chi ph vn hnh. V vy ta phi a ra nhiu phng n ri tin hnh tnh ton so snh chn c phng n thit k.

Trong mt s trng hp khi chng ta ch quan tm n hai yu t l vn u t v chi ph vn hnh hng nm hng nm ng thi v coi l khng i qua cc nm. Tuy nhin i vi nhng cng trnh ln (khu cng nghip) gi thit ny khng cn ph hp na. Khi cn xt hiu qu ca vn u t trong cc giai on khc nhau v s bin i ca chi ph vn hnh qua cc nm, tc l phi xt n yu t thi gian.

so snh kinh t k thut gia cc phng n ta dng hm chi ph vng i:

Cv =V+CvhTrong :

- V: l tng vn u t bao gm cc vn u t v:

+ ng dy ( ch yu xt pha trung p).

+ Trm bin p ( ch xt trm bin p trung tm).

+ My ct (pha trung p).

- 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.(P+A.(A

Vi (P; (A l tn tht cng sut tc dng v tn tht in nng

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.

Vy : Cv = V + CA = V+=V+CA0 .(P/A,i,T) = V+CA0.

Trong : - CA0 : chi ph v tn tht in nng nm 0.

CA0 = (AA 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.

Xc nh tn tht in nng trm bin p trung tm.

Tn tht in nng c xc nh theo cng thc :

Trong :

n - S my bin p ghp song song.

t - Thi gian my bin p vn hnh, vi MBA vn hnh sut nm t = 8760 h.

( - Thi gian tn tht cng ln nht [h].

( = (0,124 +Tmax.10-4)2.8760

(P0, (Pn - Tn tht khng ti v tn tht cng sut ngn mch ca MBA[kW].

Stt - Cng sut tnh ton ca MBA [kVA].

SdmBA - Cng sut nh mc ca MBA [kVA].

Xc nh tn tht in nng trn dy dn.

- Tn tht cng sut tc dng

Trong : R - in tr l cp

l - chiu di l t TBATT n cc nh my [ km ]

S [kVA] ; U [kV]

r0 - in tr trn mt n v chiu di cp [ (/km ]

- Tn tht in nng

(AD= (PD( , kWh

Trong : ( - thi gian tn tht cng sut ln nht [h]

3.5.1. Phng n i dy 1

3.5.1.1. Vi cp in p 35 kV

1- Tnh tn tht in nng trong 1 nm.

a) Tn tht in nng trong my bin p (ch xt TBATT: TDH-25000/110).

Trong : - n=2; t = 8760h; (P0 = 29kW; (Pn = 120 kW; SdmBA=25000 kVA.

- ( = (0,124 +TmaxCN.10-4)2.8760 vi TmaxCN =

( ( = (0,124 + .10-4)2.8760 = 2651,28 h

Vy: = 652769,24 kWh.

b) Tn tht in nng trn ng dy.

Xt ng dy t TBATT-Nh my ch to ph tng t- xe my

vi R = = 3,41 (

= 71,57 kW

Vi Tmax = 4000 h ( ( = 2405,29 h

(AD1= (PD1.( = 71,57 .2405,29 = 172145,47 kWh

Tng t vi cc ng dy cn li ta thu c bng tng kt 2.14 Vy ta c tng tn tht in nng trn ng dy l:

(AD35 = ((ADi = 1172424,62 kWh

Bng 3.11. Tn tht in nng trn ng dy 35kV- PA1

ng dyLL

(km)r0(/km)R

()Stt(kVA)PDi(kW)Tmaxi(h)

(h)(Ai

(kWh)

TBA-NM1210.480.653.415073.5371.57040002405.29172145.47

TBA- NM2219.890.656.462305.1528.04035001968.1655187.42

TBA- NM3210.300.653.354950.0066.95750003410.93228385.32

TBA- NM4217.820.655.793428.5755.57550003410.93189563.47

TBA- NM526.030.461.398603.4983.80350003410.93285845.46

TBA - KDC29.980.462.307500.00105.40130001574.84165989.51

Tng1097116,66

( Tng tn tht in nng ca PA1-35kV l:

(A1-35 = (AD35 + (AB35 = 1097116,66 + 652769,24 = 1749885,89 kWh

2- Tnh chi ph tnh ton vng i (Cv).

a) Tnh vn u t (V): V = VB + VD + VMC- Cho TBATT(110/35kV): VB35 = 2.3720.106 = 7440.106 .

- Cho ng dy: Vdi = 1,8.Kdi.Li (vi 1,8 l h s ng thi cho 1 l kp)

Bng 3.12. Vn u t cho ng dy 35kV- PA1

ng dyLL

(km)Dyn gi

(106/km)Thnh tin(106)

TBA-NM1210.48AC-50197.43723.8

TBA- NM2219.89AC-50197.47067.3

TBA- NM3210.3AC-50197.43659.8

TBA- NM4217.82AC-50197.46331.8

TBA- NM526.03AC-70235.92560.5

TBA - KDC29.98AC-70235.94237.7

(VD35 = 27580,8.106

- Cho my ct ( ch tnh cho my ct trung p cp 35kV): s dng 33 MC trung p, mi MC c gi l 26000 USD = 416,52.106 ( t gi 1USD=16020 )

VMC35 = 33. 416,52.106 = 13745,16.106( Tng vn u t cho PA1 - 35kV l:

V1-35 = VB + VD + VMC = 7440.106+27580,8.106+13745,16.106

= 48766.106

b) Tnh chi ph tnh ton vng i:Cv = V + CA = V+CA0.

Trong : - V = 48766.106

- CA0 = (A1-35.(A vi (A= 1000/kWh; (A1-35= 1749885,89 kWh

( CA0 = 1749885,89.1000 = 1749,89.106

- i = 12%; T=30 nm.

Vy: Cv1-35 = 48766.106+ 1749,89.106.

= 62861,7.106

3.5.1.2. Vi cp in p 22 kV

Hon ton tng t nh phng n trn ta c kt qu nh sau:


a) Tn tht in nng trong my bin p.

Cc thng s ca MBATT cp 22kV ging vi cp 35kV ta c:

652769,24 kWh.



ng dyLL

(km)r0(/km)R


(h)(Ai

(kWh)

TBA-NM1210.480.4602.415073.53128.19340002405.29308340.66

TBA- NM2219.890.6506.462305.1570.96935001968.16139678.91

TBA- NM3210.300.4602.374950.00119.93150003410.93409075.42

TBA- NM4217.820.6505.793428.57140.66050003410.93479783.59

TBA- NM526.030.2700.818603.49124.49650003410.93424646.90

TBA- KDC29.980.3301.657500.00191.37830001574.84301389.05

Tng2062914,54

Vy ta c tng tn tht in nng trn ng dy l:

(AD22 = ((ADi = 2062914,54 kWh( Tng tn tht in nng ca PA1-22kV l:

(A1-22 = (AD22 + (AB22 =2062914,54 +652769,24 = 2715683,77 kWh


a) Tnh vn u t (V): V = VB + VD + VMC

- Cho TBATT(110/22kV): VB35 = 2.3600.106 = 7200.106 .

- Cho ng dy: Vdi = 1,8.Kdi.Li


ng dyLL

(km)Dyn gi


TBA-NM1210.48AC-70171.53235.2

TBA- NM2219.89AC-50143.55137.6

TBA- NM3210.3AC-70171.53179.6

TBA- NM4217.82AC-50143.54602.9

TBA- NM526.03AC-120228.22476.9

TBA-KDC29.98AC-95200.93609.0

(VD22 = 22241,1.106

- Cho my ct: s dng 33MC trung p 22kV, mi MC c gi l 22000 USD = 352,44.106


V1-22 = VB + VD + VMC = 7200.106+22241,1.106+11630,5.106

= 41071,6.106

b) Tnh chi ph tnh ton vng i:

Cv = V + CA = V+CA0.

Trong :

- V = 41071,6.106

- CA0 = (A1-22.(A = 2715683,77.1000 = 2715,68.106

- i = 12%; T=30 nm.

Vy: Cv1-22 = 41071,6.106 + 2715,68.106. = 62947.106 3.5.2. Phng n i dy 2

Phng n 2 c tnh ton hon ton tng t nh phng n 1

3.5.2.1. Vi cp in p 35 kV


a) Tn tht in nng trong my bin p (ch xt TBATT: TDH-25000/110).

= 652769,24 kWh.


Ring: Tmax4-2 = = 2965,98 h


ng dyLL

(km)r0(/km)R


(h)(Ai

(kWh)

TBA-NM1210.480.653.415073.5371.57040002405.29172145.47

NM 4- NM2211.590.653.772305.1516.3392965.981549.6725320.22

TBA- NM3210.300.653.354950.0066.95750003410.93228385.32

TBA- NM4217.820.655.795733.19155.39950003410.93530055.39

TBA- NM526.030.461.398603.4983.80350003410.93285845.46

TBA- KDC29.980.462.307500.00105.40130001574.84165989.51

Tng1407731,47


(AD35 = ((ADi = 1407731,47kWh

( Tng tn tht in nng ca PA2-35kV l:

(A2-35 = (AD35 + (AB35 = 1407731,47+ 652769,24 = 2060510,61 kWh


a) Tnh vn u t (V): V = VB + VD + VMC- Cho TBATT(110/35kV): VB35 = 2.3720.106 = 7440.106 .

- Cho ng dy: Vdi = 1,8.Kdi.Li (vi 1,8 l h s ng thi cho 1 l kp)


ng dyLL

(km)Dyn gi


TBA-NM1210.48AC-50197.43723.8

NM4- NM2211.59AC-50197.44118.2

TBA- NM3210.3AC-50197.43659.8

TBA- NM4217.82AC-50197.46331.8

TBA- NM526.03AC-70235.92560.5

TBA- KDC29.98AC-70235.94237.7

(VD35 = 24631,7.106

- Cho my ct ( ch tnh cho my ct trung p cp 35kV): s dng 33 MC trung p, mi MC c gi l 26000 USD = 416,52.106


V2-35 = VB + VD + VMC = 7440.106+24631,7.106+13745,16.106

= 45816,8.106

b) Tnh chi ph tnh ton vng i:Cv = V + CA = V+CA0.

Trong : - V = 45816,8.106

- CA0 = (A2-35.(A = 2060510,61.1000 = 2060,51.106

- i = 12%; T=30 nm.

Vy: Cv2-35 = 45816,8.106 + 2060,51.106.

= 45816,8.106 + 2060,51.106. 8,0552 = 62414,7.106

3.5.2.2. Vi cp in p 22 kV

Hon ton tng t nh phng n trn ta c kt qu nh sau:


a) Tn tht in nng trong my bin p.

Cc thng s ca MBATT cp 22kV ging vi cp 35kV ta c:

652769,24 kWh.



ng dyLL

(km)r0(/km)R


(h)(Ai

(kWh)

TBA-NM1210.480.462.415073.53128.19340002405.29308340.66

NM4- NM2211.590.653.772305.1541.3542965.98491549.6764085.27

TBA- NM3210.300.462.374950.00119.93150003410.93

TBA- NM4417.820.462.055733.19139.17250003410.93474707.90

TBA- NM526.030.270.818603.49124.49650003410.93424646.90

TBA- NM629.980.331.657500.00191.37830001574.84301389.05

Tng1982245,21


(AD22 = ((ADi = 1982245,21kWh( Tng tn tht in nng ca PA2-22kV l:

(A2-22 = (AD22 + (AB22 =1957892.81+652769,24 = 2635014,45 kWh


a) Tnh vn u t (V): V = VB + VD + VMC

- Cho TBATT(110/22kV): VB35 = 2.3600.106 = 7200.106 .

- Cho ng dy: Vdi = 1,8.Kdi.Li


ng dyLL

(km)Dyn gi


TBA-NM1210.48AC-70171.53235.2

TBA- NM2211.59AC-50143.52993.7

TBA- NM3210.3AC-70171.53179.6

TBA- NM4417.82AC-70171.511002.1

TBA- NM526.03AC-120228.22476.9

NM 4- NM629.98AC-95200.93609.0

(VD22 = 26496,4.106

- Cho my ct: s dng 37 MC trung p 22kV, mi MC c gi l 22000 USD = 352,44.106


V2-22 = VB + VD + VMC = 7200.106+26496,4.106+13040,3.106

= 46736,7.106

b) Tnh chi ph tnh ton vng i:


Trong :

- V = 46736,7.106

- CA0 = (A2-22.(A = 2635014,45.1000 = 2635,01.106

- i = 12%; T=30 nm.

Vy: Cv2-22 = 46736,7.106 + 2635,01.106.8,0552 = 67962,25.106 T cc s liu tnh ton c cc s liu cho trong bng di y.

Bng 3.19 - Tng hp tnh ton chi ph tnh ton cho cc phng n

Phng nVn u t

(106)Tn tht in nng (kWh)Chi ph vng i (106 )

Phng n 148766,01749885,8962861,7

Phng n 241071,62715683,7762947

Phng n 345816,82060510,6162414,7

Phng n 446736,72635014,4567962,25

Nhn Xt : Qua kt qu tnh ton ta thy phng n 2 v 4 c chi ph vng i v tn tht in nng l ln nht ta loi hai phng n ny ra. phng n 1 c chi vng i xp x phng n 3 nhng tn tht in nng v tn tht in p nh hn phng n 3.Ngoi ra phng n 1 l phng n hnh tia nn vn hnh d dng v d pht trin trong tng lai. Ta chn phng n 1 lm phng n thit k mng cao p ca khu cng nghip. ( Phng n c cp in p trung p35 KV v kiu i dy 1)

3.6. THHIT K CHI TIT CHO PHNG N LA CHN

3.6.1. Chn dy dn 110kV t h thng v khu cng nghip

La chn ng dy cung cp t H thng in v trm TBATT ca khu cng nghip l ng dy trn khng (DK), chn loi dy dn l dy nhm li thp AC cp in p l 110 kV vi khong cch l = 15km.

- Vi TmaxCN = 4261,43 gi (tnh ton trong phn 3.5.1), tra bng tm c:

Jkt= 1,1 A/mm2

- Chn ng dy l kp dy dn c tit din AC- 70 c r0 = 0,46 (/km

x0= 0,442 (/km vi khong cch trung bnh hnh hc Dtb= 5m; Icp= 265 A

+ Kim tra dy dn chn theo iu kin dng s c. Khi t mt dy, dy cn li s phi truyn ti ton b cng sut, do ta c :

Isc = 2.IttCN = 2.62,57 = 125,14 A

c Icp = 265 A ( Isc < Icp .Nh vy dy chn tho mn iu kin Isc.

+ Kim tra dy dn chn theo iu kin tn tht in p :

Tn tht in p trn ng dy :

= 1% < Ucp% = 10 % (PttKCN, QttKCN tnh theo n v MW v MVAr ) ( Dy dn chn tho mn iu kin tn tht in p cho php.

3.6.2. Tnh ngn mch cho mng cao p

1) S cc im ngn mch:

- S nguyn l rt gn:

- S thay th :

2) Mc ch tnh cc im ngn mch

- Tnh im ngn mch N1 chn v kim tra kh c in pha cao p trm BATT 110 kV gm my ct v thanh gp.

- N2,N3 chn v kim tra kh c in pha h p trm BATT 35 kV gm my ct, thanh gp v cc thit b trn ng dy t TBA v cc nh my.

3) Tnh cc thng s ca s thay th

Ta tin hnh tnh ton cc thng s trong h n v tng i vi

Scb = 100 MVA v Ucb = Utb do ta c ngay (vi Utb = 1,05.Udm):

Ucb35 = Utb35 = 36,75 kV; Ucb110 = Utb110 = 115 kV* in khng ca h thng c tnh theo cng thc :

Trong :

SN - Cng sut ngn mch v pha h p ca trm bin p khu vc.

SN = 400 MVA

= 0, 25; UHT = 1.

* in tr v in khng ca ng dy :

Trong :

r0, x0 - in tr v in khng trn 1 km dy dn [(/km] .

l - Chiu di ng dy [km].

- Vi ng dy t HT v TBATT:

= 0,026+j0,025

- Vi ng dy t TBATT v nh my ch to ph tng t-xe my

= 0,252+j0,152

- Tng t vi cc l ng dy cn li ta c bng tng ktBng 3.21. Thng s cc ng dy trn khng

ng DyL

[Km ]LTit din

[mm2]r0[(/km]x0[(/km]RDi

[(]XDi[(]

HT - TBATT152AC-700.460.4420.0260.025

TBATT 110.482AC-500.650.3920.2520.152

TBATT 219.892AC-500.650.3920.4790.289

TBATT 310.302AC-500.650.3920.2480.149

TBATT 417.822AC-500.650.3920.4290.259

TBATT 56.032AC-700.460.3820.1030.085

TBATT 69.982AC-700.460.3820.1700.141

in tr v in khng MBATT vi cc thng s:

Tn trm TBATTSdm

[kVA]Uc/Uh [kV](P0

[kW](Pn

[kW]Un

[%]I0

[%]

TDH-25000/11025000115/352912010,50,8

= 0,0192

= 0,42

ZB = 0,0192 + j0,42

4) Tnh dng ngn mch 3 pha i xng ti cc im ngn mch

Trong qu trnh tnh ton ngn mch ta c th coi ngun c cng sut v cng ln v tin hnh tnh ton gn ng trong h n v tng i c bn. y ta ch xt ngn mch l 3 pha i xng.

* Dng ngn mch trong h n v tng i:

vi ZN l tng tr ngn mch trong h n v tng i.

* Dng in ngn mch trong h n v c tn.:

, kA

* Dng in ngn mch xung kch (ixk) c tnh nh sau:

ixk = kxk . .I(3)N vi kxk = 1,8 l h s xung kch i vi ngn mch xa ngun.

a) Dng ngn mch ti im N1:

Ta c: XHT = 0,25; ZDHT = 0,026+j0,025;

ZN1 = XHT + ZDHT = j0,25+ 0,026+j0,025 = 0,026+j0,275

kA

ixkN1 = kxk ..I(3)N1 =1,8..= 4,63 kA

b) Dng ngn mch ti im N2:

ZN2 = ZN1 + ZB = 0,026+j0,275+ 0,0192 + j0,42 = 0,0452+j0,695

kA

ixkN2= kxk ..I(3)N2=1,8..2,256 = 5,742 kA

c) Dng ngn mch ti im N3:

* Tuyn ng dy t TBATT ti nh my ch to ph tng t- xe my.ZN3-1 = ZN2 + ZD1 = 0,0452+j0,695+0, 252 + j0, 152 = 0,297+ j0,847

kA

ixkN3-1= kxk ..I(3)N3-1=1,8..1,750 = 4,454kA

Tng t vi cc tuyn ng dy cn li ta thu c bng sau:

Bng 2.24. Dng ngn mch ti im N3

LRDiXDiI*N3-iIN3-i(kA)ixkN3i(kA)

TBATT 10.2970.8471.1141.7504.454

TBATT 20.5240.9840.8971.4103.588

TBATT 30.2930.8451.1191.7574.473

TBATT 40.4740.9540.9391.4753.755

TBATT 50.1480.7801.2591.9785.035

TBATT 60.2150.8361.1581.8194.632

3.6.3. Chn v kim thit b in cho mang cao p ca khu cng nghip

1) Chn MC pha 110 kV

iu kin chn v kim tra:

- in p nh mc, kv : UmMC ( Um.m =110kV

- Dng in lu di nh mc, A : Im.MC ( Icb = = 125,14 A

- Dng in ct nh mc, kA : Im.ct ( IN1= 1,82 kA

- Dng n nh ng, kA : Im. ( ixkN1 = 4,63 kA

- Dng n nh nhit : tm.nh( I(

- Chn my ct SF6 cao p loi SB6 do SCHNEIDER ch to c bng thng s sau (tra bng 5.14- TL3) :

LoiUm, kvIm, AIm.C, kAi, kA

SB6123200031,580

My ct c dng nh mc Im > 1000A do khng phi kim tra dng n nh nhit.

2) Chn my bin dng in (BI) pha 110 kV

* iu kin chn my bin dng:

- in p nh mc: UmBI ( Ummng = 110 kV - Dng in ct nh mc: ImBI ( Icb = 125,14 A

- Ph ti th cp: Z2mBI ( Z2 = r2- Dng n nh ng: I = K..Ims ( ixk = 4,63 kA (K bi s n nh ng)

- Dng n nh nhit: (knhm.I1n)2 . tnh ( BN (Knhm bi s n nh nhit)

Tra bng 8.11- TL 3 . Ta chn loi my bin dng c m hiu T(HP35 v T(H110M do LIN X ch to c cc thng s nh bng sau:

Loi BIUm (kV)Ims

( A)ImT (A)Cp

chnh xcZ2m

(()Kil

(kA)Inh/tnh

(kA)

T(H110M110400-800050,53075--

T(HP353520000,5

V dng in nh mc s cp ca my bin dng > 1000 A nn ta khng cn kim tra n nh nhit.

3) Chn my bin in p (BU) pha 110 kV

* Trn thanh ci pha cao p ca TBATT ta t 1 my bin in p o lng 3 pha u theo s .

Tra TL 5 ta chn c loi my bin in p loi HK(-110-57 v HOM-35-54 do Lin X ch to c cc thng s k thut

Loi my bin in pCp in p;kVUm;kV

s cpUm;V th cp chnhSm;

VACp chnh xc

HOM-35-543535/

100/

1500,5

HK(-110-57110110/

100/

4000,5

4) Chn dao cch ly (DCL) pha 110 kV

- in p nh mc, kV : UmDCL ( Um.m =110 kV

- Dng in lu di nh mc, A : Im.DCL ( Icb = 125,14 A

- Dng n nh ng, kA : im. ( ixkN1 = 4,63 kA

- Dng n nh nhit, kA : tm.nh.I2 m.nh ( tq.I2(* Tra TL 5 Chn dao cch li t ngoi tri, li dao quay trong mt phng nm ngang loi 3DP2 do SIEMENS ch to:

LoiUm, kvIm, AINt, kAIN max, kA

3DP212312502060

DCL c dng nh mc Im > 1000A do khng phi kim tra dng n nh nhit.

5) Chn CSV pha 110 kV v 35 kV- Chng st van c la chn theo cp in p do ta chn loi chng st van do Lin x ch to loi PBC-110 kV.v PBC-35 kV3.6.4. Kim tra cc thit b in pha h p ca MBATT chn s b

1) Kim tra dy dn

y dy dn l ng dy trn khng do trong qu trnh ch s b ta chn theo iu kin pht nng v kim tra theo iu kin tn tht in p cho php. Nn ta khng cn kim tra trong trng hp ny.

2)Kim tra my ct trung p

T mc IV.4.3.2 ta chn c MC trung p SF6 loi F400 do Schneider ch to c cc thng s nh sau:

Loi MCUdm(kV)Idm

(A)Ictdm(kA)In/tn

(kA)I(kA)

F4003612502525/140

* Vi MC pha h p TBATT xt cho im ngn mch N2:

iu kin kim tra:

- in p nh mc, kv : UmMC ( Um.m =35 kV

- Dng in lu di nh mc, A : Im.MC ( Icb = A

- Dng in ct nh mc, kA : Im.ct ( IN2 = 2,256 kA

- Dng n nh ng, kA : Im. ( ixkN2 = 5,742 kA

- My ct c dng nh mc Im > 1000A do khng phi kim tra dng n nh nhit.

* Tng t vi cc MC trn ng dy v cc nh my trong khu cng nghip xt cho im ngn mch N3 ta nhn thy m bo cc iu kin kim tra:3.6.5. S nguyn l mng cao p ca khu cng nghip

THIT K MNG CAO P CA NH MY LIN HP DT

4.1. 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.

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 :

1. Vch phng n cung cp in.

2. La chn v tr, s lng, dung lng ca cc trm bin pv la chn tit din cc ng dy cho cc phng n.

3. Tnh ton kinh t k thut la chn phng n hp l.

4. Thit k chi tit cho phng n c chn.

4.2. VCH CC PHNG N CUNG CP IN

Theo tnh ton chng trc th cp in p truyn ti t trm bin p trung tm ca khu cng nghip v nh my l 35 KV.

4.2.1. Phng n v cc trm bin p phn xng:

Cc trm bin p phn xng c la chn trn nguyn tc sau:

1. 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.

2. 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.

3. Dung lng cc MBA c chn theo iu kin:

n.khc.SdmB Stt

V kim tra theo iu kin qu ti s c:

( n- 1). khc.kqt.SdmB Sttsc

Trong :

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 ko si v khu nh vn phng.

* Trm B2 cung cp cho ph ti ca phn xng dt vi.

* Trm B3 cung cp cho ph ti ca phn xng nhum v in hoa

* Trm B4 cung cp cho ph ti ca phn xng git l ng gi 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.

4.2.2.Chn cc my bin p phn xng

* Trm bin p B1:

iu kin chn MBA:

n.khc.SdmB Stt = 1616,63 KVA

SdmB = 808,313 ( 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 = 808,313 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 4.1- Kt qu chn MBA cho cc trm bin p phn xng

TrmS lng MBAStt( KVA)SttB

( KVA)Ssc( KVA)(n-1).khckqtsc.Sdm

( kVA )SdmB( KVA )

B121780.47890.241246.331780.471000

B222872.501436.252010.752872.501600

B321066.87533.44746.811066.87560

B42830,62415,31577.05830,62560

B51217.36217.36--250

4.2.3 Xc nh v tr cc trm bin p 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.

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 B4 ( 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:

Chn v tr thc ca trm B4 l (94,25;70)

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 4.2 - Kt qu xc nh v tr t trm bin p phn xng:

Tn TrmV tr t

XoiYoi

B124.352.5

B24952.5

B393.670

B494,2570

B59923

4.3 PHNG N CUNG CP IN CHO CC TRM BIN P PHN XNG4.3.1Cc phng n cung cp in cho trm bin p phn xng:

Hnh 4.1 Cc kiu s cung cp in

4.3.1.1. Kiu s c trm bin p 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.

(Loi s ny thng c p dng trong cc trng hp nh my c cc

phn xng t tng i gn nhau v xa h thng.

4.3.1.2. Kiu s khng c trm phn phi trung tm (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 c tn tht (P, (A, (U

- 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.

(Loi s 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.

4.3.1.3. Kiu s s dng trm phn phi trung tm (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 c tn tht (P, (A, (U.

- 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.

(Loi s ny thng p dng cho cc nh my c cc phn xng cng sut ln v khi in p ngun khng cao.

Nu s dng phng n ny, v nh my l h loi nn phi t 2 MBA vi cng sut dc chn theo iu kin ( c xt n s pht trin ca ph ti nh my trong vng 10 nm ):

n.khc.SdmB SttNM(10) = 8603,49 kW

SdmBA = = 4315,25 ( kVA)

Chn MBA tiu chun c cng sut nh mc Sdm = 5600 kVA

Kim tra theo iu kin qu ti:

( n- 1). khc.kqt.SdmB SttscSdmBA = = 4315,25 kVA

Vy MBA chn tha mn.

4.3.2. Xc nh v tr t trm bin p trung gian , trm phn phi trung tm ca nh my:

Da vo h trc ta XOY chn c th xc nh c tm ph ti in ca nh my :

V tr tt nht t TBATG hay TPPTT c ta l M(62;60 ) theo v tr nh xng.

4.3.3. La chn phng n ni dy ca mng cao p:

Nh my thuc h loi nn ta dng ng dy kp t KCN n nh my.

Do tnh cht quan trng ca cc phn xng nn mng cao p trong nh my nn ta dng s hnh tia hoc lin thng. Vi phn xng loi 1 ta dng l kp, vi phn xng thuc h loi 3 ta dng ng dy n. S loi ny c nhiu u im l s u dy r rng, cc trm bin p phn xng c cp in t mt ng dy ring nn t nh hng ln nhau, tin cy cung cp in tng i cao, d thc hin bo v v t ng ha, d vn hnh. Cc ng cp cao p u c t trong cc ng xy ring trong t dc theo cc tuyn giao thng ni b.

T phn tch trn ta a ra 4 phng n thit k mng cao p ca nh my c trnh by trn hnh v:

Hnh 4.2 Cc phng n thit k mng cao p

4.4. TNH TON KINH T - K THUT CHO CC PHNG N.

so snh kinh t k thut gia cc phng n ta dng hm chi ph vng i:

Cv =V+CvhTrong :

- 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.(P+A.(A

Vi (P; (A l tn tht cng sut tc dng v tn tht in nng

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.

Vy : Cv = V + CA = V+=V+CA0 .(P/A,i,T) = V+CA0.

Trong : - CA0 : chi ph v tn tht in nng nm 0.

CA0 = (AA 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.

.

4.4.1 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 4.3- S phng n 1

1.Chn my bin p phn xng v xc nh tn tht in nng trong cc trm bin p.

* Chn MBA phn xng:

Trn c s chn c cng sut MBA phn 3.2.1 ta c bng kt qu chn MBA cho cc trm bin p phn xng:

Bng 4.3 Cc thng s ca my bin p trong phng n 1

Tn TBASdm

( kVA )UC/UH(kV)PO(kW)PN(kW)UN (%)IO(%)S lngGi (106)Thnh tin (106 )

TBATG560035/105,2734,570,725051010

B1100010/0,41,55951,32125250

B2160010/0,42,115,55,50,72204,8409,6

B356010/0,40,945,2141,3269,8139,6

B456010/0,40,945,2171,0269,8139,6

B525010/0,40,64351,5142,342,3

Tng vn u t cho TBA: VB = 1991,1.106

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:

A = n.Po.t +

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 = 5000h

= ( 0,124 + 10 - 4.Tmax)2.8760 = 3410,93 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 = 8603,49 kVA

SdmB = 5600 kVA

Po = 5,27 kW

PN = 34,5 kW

Ta c : A = 2.5,27.8760 +

Tnh ton tng t cho cc TBA khc, kt qu tnh ton cho trong bng sau

Bng 4.4 - Kt qu tnh ton tn tht in nng trong cc TBA phng n 1

TN TBAS MYSTT( kVA)SM(kVA) PO(kW) PN (kW)A(kWh)

TBATG28603.4956005.2734.5231208.95

B121780.4710001.55975814.28

B222872.5016002.115.5121994.82

B321066.875600.945.2148718.90

B42830.625600.945.2135723.62

B51217.362500.64313341.86

Tng tn tht in nng trong cc trm bin p: AB = 526820,43

2.Chn dy dn v xc nh tn tht cng sut, 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 = 5000 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 = mm2

Dng in lm vic cc i qua mt si cp :

A

Trong :

n - s l cp

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:

khc.Icp Isc

Trong :

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:

Tra PL 4.32 TL1 , la chn cp tiu chun ph hp l cp c tit din 25 mm2, cp ng 3 li 10 kV cch in XLPE , ai thp, v PVC do hng FURUKAWA ( Nht ) ch to c Icp = 140 A .

Kim tra cp chn theo iu kin pht nng:

0,93.Icp = 0,93.140 = 130,2 > Isc = 2.Imax = 2.51,4= 102,8

Vy cp chn tha mn iu kin.

Tnh ton tng t cho cc l cp khc ta c kt qu tnh ton chn tit din cp cao p nh sau:

Bng 4.5- Kt qu chn cp cao p ca phng n 1

NG CPSTTFLroRN GITHNH TIN

(kVA)(mm2)(m)(/km)( )(103 /m)(103 /m)

TBATG - B11780.47251130.9770.05512528250

TBATG - B22872.5050500.4940.01217417400

TBATG - B31066.8716581.470.042809200

TBATG - B4824.36161061.470.0788016920

TBATG - B5217.36161811.470.2668014480

Tng vn u t cho ng dy: VD = 86250.103

* Xc nh tn tht cng sut tc dng trn ng dy:

Cng thc xc nh tn tht cng sut tc dng trn ng dy:

P = ( kW).

Trong :

R =

n - s ng dy i song song

- Tn tht P trn on cp t TBATG B1 :

P = = 1,66 kW

Tnh ton tng t cho cc ng dy khc ta c kt qu :

Bng 4.6 - Tn tht cng sut tc dng trn cc ng dy c a phng n 1

NG CPFLroRSTTP

(mm2)(m)(/km)( )(kVA)(kW)

TBATG - B1251130.9270.0521780.471.660

TBATG - B250500.4940.0122872.501.019

TBATG - B316580.9770.0281066.870.320

TBATG - B4161061.470.078824.360.528

TBATG - B5161811.470.266217.360.126

Tng tn tht cng sut tc dng trn ng dy: PD = 3,653 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 = PD.

Trong :

- thi gian tn tht cng sut ln nht, = 3410,93 h. vi Tmax = 5000 h

AD = 3,653.3410,93 = 12460,15 kWh

3. Vn u t mua my ct in trong mng in cao p ca phng n 1:

Chn my ct in:

Chn my ct pha h p ca TBATG:

Chn my ct F200 ca hng Schneider( Php) c Im = 1250 A. Gi mi my l 17000 USD. My ct lin lc ta cng chn l my ct F200

Chn my ct cho mch cp t TBATG n B1:

Dng in cng bc khi s c hng mt ng cp:

Icb =

Chn my ct F200 ca hng Schneider ( Php) c Im = 1250 A, gi mi my l 17000 USD.

Tnh ton tng t cho cc mch cp khc ta c bng kt qu chn cp mh sau:

Bng 4.7 - Kt qu chn my ct cao p phng n I

NG CPSTT

( kVA )S MCHIcb

(A)LOI MY CTN GI

(USD)THNH TIN

(USD)

TBATG8603,492496,72F2001700034000

MCLL-1-F2001700017000

TBATG - B11780.472102.80F2001700034000

TBATG - B22872.502165.84F2001700034000

TBATG - B31066.87261.60F2001700034000

TBATG - B4824.36247.59F2001700034000

TBATG - B5217.36112.55F2001700017000

Tng vn u t cho my ct: VMC = 204000 USD = 3268,08.106

.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 = (1991,1 + 86.25 + 3268,08).106 = 5345,43 .106

-Tng tn tht in nng trong cc trm bin p v ng dy:

A1 = AB + AD = 526802,43 + 12460,15 = 539262,58 (kWh)

- Chi ph vng i :


Trong : - V = 5345,43.106

- CA0 = (A1.(A vi (A= 1000/kWh; (A1= 539262,58 kWh

( CA0 = 539262,58.1000 = 539,26.106

- i = 12%; T=30 nm.

Vy: Cv1= 5345,43.106+ 539,26.106.

= 5345,43.106+ 539,26.106. 8,0552 = 9689,28.106

4.4.2 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 4.4 - S phng n 2

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 4.8 - Kt qu chn MBA phn xng cho phng n 2

Tn TBASdm


TBATG560035/105,2734,570,725051010

B1100010/0,41,55951,32125250

B2160010/0,42,115,55,51,02204,8409,6

B356010/0,40,945,2141,5269,8139,6

B456010/0,40,945,2141,5269,8139,6

B525010/0,40,64341,7142,342,3

Tng vn u t cho TBA: KB = 1991,1.106

Xc nh tn tht in nng trong cc trm bin p:

Bng 4.9 - Kt qu tnh ton tn tht in nng trong cc TBA phng n 2


TBATG28603.4956005.2734.5231208.95

B121780.4710001.55975814.28

B222872.5016002.115.5121994.82

B321066.875600.945.2148718.90

B42830,625600.945.2135723.62

B51217.362500.64313341.86

Tng tn tht in nng trong cc trm bin p: AB = 526820,43

2. Chn y dn v xc nh tn tht cng sut, tn tht in nng trong mng in:

Bng 4.10 - Kt qu chn cp cao p ca phng n 2


(kVA)(mm2)(m)(/km)()(103/m)( 103/m)

TBATG - B24652.9770500.3420.01720820800

TBATG - B31891.2425580.9270.05412514500

B2 - B11780.4725630.9270.05812515750

B3 - B4824.3616481.470.071807720

TBATG - B5217.36161811.470.2668014480

Tng vn u t cho ng dy: KD = 73250.103

Bng 4.11 - Tn tht cng sut trn cc ng dy ca phng n II

NG CPFLroRSTTP


TBATG - B270500.3420.0094652.971.851

TBATG - B325580.9270.0271891.240.962

B2 - B125630.9270.0291780.470.926

B3 - B416481.470.035824.360.241

TBATG - B5161811.470.266217.360.126


Tng tn tht in nng trn cc ng dy trong phng n II:

AD = 4,105.3410.93 = 14001,95 (kWh)

3. Vn u t mua my ct in trong mng cao p ca phng n II :

Bng4.12. - Kt qu chn my ct phng n II

NG CPSTT

( kVA )S MCHIcb

(A)LOI MY CTN GI

(USD)THNH TIN

(USD)

TBATG8603.492496.72F2001700034000

MCLL-1-F2001700017000

TBATG - B24652.972268.64F2001700034000

TBATG - B31891.242109.19F2001700034000

TBATG - B5217.36112.55F2001700017000

Tng vn u t cho my ct: VMC =136000 USD = 2178,72.106

4. Chi ph vng i ca phng n II :

* Chi ph vng i ca phng n II :

-Vn u t:

V2 = VB + VD + VMC = (1991,1 + 73,25 + 2178,72).106 = 4243,07.106

- Tng tn tht in nng trong cc TBA v ng dy:

A2 = AB + AD = 526820,43 + 14001,95 = 540822,38 kWh

- Chi ph vng i:


Trong : - V2 = 4243,07.106

- CA0 = (A2.(A vi (A= 1000/kWh; (A2= 540822,38 kWh

( CA0 = 540822,38.1000 = 540,82.106

- i = 12%; T=30 nm.

Vy: Cv2= 4243,07.106 + 540,82.106.

= 4243,07.106 + 540,82.106. 8,0552 = 8599,48.1064.4.3 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 4.5- S phng n 3.

1. Chn my bin p phn xng v xc nh tn tht in nng trong cc MBA:

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

Bng 4.13 - Kt qu chn MBA trong cc TBA phng n III

Tn TBASdm


B1100035/0,41,681061,32141,6283.2

B2160035/0,42,4166,512223,2446.4

B356035/0,41,065,4751,5283,5167

B456035/0,41,065,4751,5283,5167

B525035/0,40,723,251,7152,652.6


Bng 4.14 - Tn tht in nng trong cc TBAPP phng n III:


B121780.4710001,681083498.36

B222872.5016002,416129999.30

B321066.875601,065,4752430.71

B42830,625601,065,4739095.10

B51217.362500,723,214558.36

Tng tn tht in nng trong cc trm bin p: AB = 319581,83 kWh

1. Chn dy dn v xc nh tn tht in nng trong mng in:

Bng 4.15 - Kt qu chn tit din dy dnca phng n III


(kVA)(mm2)(m)(/km)( )(103/m)( 103 /m)

TBATG - B11780.47501130.4940.02828263732

TBATG - B22872.5050500.4940.01228228200

TBATG - B31066.8750580.4940.01428232430

TBATG - B4824.36501060.4940.02628259643

TBATG - B5217.36501810.4940.08928251042


Bng 4.16 - Tn tht cng sut trn cc ng dy ca phng n III

NG CP

FLroRSTTP


PPTT - B1501130.4940.0281780.470.072

PPTT - B250500.4940.0122872.500.083

PPTT - B350580.4940.0141066.870.013

PPTT - B4501060.4940.026824.360.014

PPTT - B5501810.4940.089217.360.003


Tng tn tht in nng trn cc dng dy ca phng n III :

AD = 0,187.3410,93 = 636.309 kWh

2. Vn u t mua my ct in trong mng cao p ca phng n III:

Bng4.17. - Kt qu chn my ct phng n III

NG CPSTT( kVA )S MCHIcb(A)LOI MY CTN GI

(USD)THNH TIN

(USD)

TPPTT8603.492141.92F4002600052000

MCLL-1-F4002600026000

PPTT - B11780.47229.37F4002600052000

PPTT - B22872.50247.38F4002600052000

PPTT - B31066.87217.60F4002600052000

PPTT - B4830,62213.60F4002600052000

PPTT - B5217.3613.59F4002600026000

Tng vn u t mua my ct VMC = 312000 USD = 4998,24.106

4. Chi ph tnh ton ca phng n III:

- Vn u t:

V3 = VB + VD +VMC = 1116,2.106 + 235,05.106 + 4998,24.106 = 6349,49.106

- Tng tn tht in nng ca cc TBA v ng dy:

A3 = AB + AD = 319581,83 + 636,309 = 320218,14 kWh

- Chi ph vng i:


Trong : - V3 = 6349,49.106

- CA0 = (A3.(A vi (A= 1000/kWh; (A3= 320218,14 kWh

( CA0 = 320218,14.1000 = 320,22.106

- i = 12%; T=30 nm.

Vy: Cv3= 6349,49.106 + 320,22.106.

= 6349,49.106 + 320,22.106. 8,0552 = 8928,93.106

4.4.4Phng n IV:

Hnh 4.6- S phng n 4

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 1 ta c:

1. Chn my bin p phn xng v xc nh tn tht in nng trong cc trm bin p phn xng.

Bng 4.18 - Kt qu chn MBA trong cc TBA phng n IV

Tn TBASdm


B1100035/0,41,681061,32141,6283.2

B2160035/0,42,4166,512223,2446.4

B356035/0,41,065,4751,5283,5167

B456035/0,41,065,4751,5283,5167

B525035/0,40,723,251,7152,652.6


Bng 4.19 - Tn tht in nng trong cc TBAPP phng n IV:


B121780.4710001,681083498.36

B222872.5016002,416129999.30

B321066.875601,065,4752430.71

B42830,625601,065,4739095.10

B51217.362500,723,214558.36

Tng tn tht in nng trong cc trm bin p: AB = 319581,83 kWh

2. Chn dy dn v xc nh tn tht in nng trong mng in:

Bng4.20- Kt qu chn cp cao p phng n IV


(kVA)(mm2)(m)(/km)()(103/m)( 103/m)

TBATG - B24652.9750500.4940.02528228200

TBATG - B31891.2450580.4940.02928232712

B2 - B11780.4750630.4940.03128235532

B3 - B4824.3650480.4940.02428227213

TBATG - B5217.36501810.4940.08928251042


Bng4.21 - Tn tht cng sut trn cc ng dy ca phng n IV:

NG CP

FLroRSTTP


PPTT - B250500.4940.0124652.970.218

PPTT - B350580.4940.0141891.240.042

B2 - B150630.4940.0161780.470.040

B3 - B450480.4940.012824.360.007

PPTT - B5501810.4940.089217.360.003

Tng tn tht cng sut tc dng trn ng dy: PD = 0.31 kW

* Xc nh tn tht in nng trn cc ng dy:

AD = 0.31.3410,93 = 1058,85 kWh

3. Vn u t mua my ct in trong mng cao p ca phng n IV:

Bng 4.22 - Kt qu chn my ct phng n IV

NG CP

STT

( kVA )S MCH

Icb

(A)LOI MY CTN GI

USDTHNH TIN

USD

TPPTT8603.492141.92F4002600052000

MCLL-1-F4002600026000

PPTT - B24652.97276.75F4002600052000

PPTT - B31891.24231.20F4002600052000

PPTT - B5217.3613.59F4002600026000

Tng vn u t cho my ct: VMC =208000 USD = 3332,16.106

4. Chi ph tnh ton ca phng n IV:

- Vn u t :

V4 = VB + VD + VMC = 1116,2.106 + 174,7.106 + 3332,16.106 = 4623,06.106

- Tng tn tht in nng trong cc TBA v ng dy:

A4 = AB + AD = 319581,83 + 1058,85 =320640,68 kWh

- Chi ph vng i:


Trong : - V4 = 4623,06.106

- CA0 = (A4.(A vi (A= 1000/kWh; (A4= 320640,68 kWh

( CA0 = 320640,68.1000 = 320,64.106

- i = 12%; T=30 nm.

Vy: Cv4= 4623,06.106 + 320,64.106.

= 4623,06.106 + 320,64.106. 8,0552 = 7205,88.106

T ta c bng tng kt kt qu tnh ton

Bng 4.23 - Tng hp ch tiu kinh t k thut ca cc phng n.

PHNG NVN U T ( 106 )TN THT IN NNG ( kWh )CHI PH VNG I ( 106 )

Phng n I5345,43539262,589689,28

Phng n II4243,07540822,388599,48

Phng n III6349,49320218,148928,93

Phng n IV4623,06320640,687205,88

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 nht, 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.

4.5 THIT K CHI TIT MNG CAO P CA NH MY

4.5.1 Chn dy dn t trm bin p trung tm ca khu cng nghip v trm phn phi trung tm.

ng dy dn t trm bin p trung tm ca khu cng ngip v trm phn phi trung tm c chiu di 6,03 Km, ta chn dy 2AC-70 theo tnh ton chng trc.

4.5.2 Chn cp cao p v h p ca nh my.

Chn cp h p ca nh my:

Cp t trm bin p B4 ti phn xng 5:

Imax =

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 3*70+50 mm2 vi Icp = 246 A.

Tng t cho cc tuyn cp h p khc ta c bng kt qu chn cp:

Bng4.24 - Tng hp kt qu chn cp cho nh my

NG CPF (mm2)L (m)Icp, Ak1.k2kIcp, AIcb, A

PPTT - B2505020018676.75

PPTT - B3505820018631.20

B2 - B1506320018629.37

B3 - B4504820018613.60

PPTT - B5501812001863.59

B1 -83*95+5090298298248.94

B5 - 73*50+3523192192135.45

B5 - 93*50+356119219252.95

B4 - 53*70+5034246246202.71

4.5.3 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 chnkhi 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:

()

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 Udmin tr v in khng ca ng dy:

R=

X=

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 :

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..IN ( kA).

S tnh ton ngn mch.

Bng 4.25. Thng s ca ng dy trn khng v cp

NG DYS MCHF(mm2)I(km)r0(/km)x0(/km)R()X()

TBATTKCN- TPPTT2AC-706.030.460.3821.38691.15173

TBATG - B223*500.05000.4940.130.01240.00325

TBATG - B323*500.05800.4940.130.01430.00377

B2 - B123*500.06300.4940.130.01560.0041

B3 - B423*500.04830.4940.130.01190.00314

TBATG - B513*500.18100.4940.130.08940.02353

* Tnh dng in ngn mch ti im N trn thanh ci ca trm phn phi trung tm.

Tnh ngn mch ti im N1 trn thanh gp pha cao p ca trm bin p phn xng B2:

Cc im ngn mch khc dc tnh ton tng t, kt qu ghi trong bng

Bng4.26- Kt qu tnh dng in ngn mch

IM NGN MCHV TRIN, kAiXK, kA

NThanh ci PPTT4.48011.405

N1-1Thanh ci B14.46611.368

N1-2Thanh ci B24.47411.389

N1-3Thanh ci B34.47311.386

N1-4Thanh ci B44.46711.371

N1-5Thanh ci B54.43411.287

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

Tnh tng t i vi cc trm bin p khc ta c kt qu

Bng 4.27 in tr v in khng ca cc my bin p phn xng

My bin pSm,kVAPo,kWPN,kWUN,%R,mX,m

B110001.681061.609.60

B216002.4166.51.006.50

B35601.065.4752.7914.29

B45601.065.4752.7914.29

B52500.723.258.1932.00

in tr v in khng ca cc phn t cp 35kV quy i v cp 0,4 kV:

Kt qu quy i cc thng s cp 35 kV sang cp 0,4 kV

Bng 4.28- Bng cc thng s quy i ca in tr

TTCp 35 kVCp 0,4 kV

R, X, R, mX, m

HT3.3760.4

TBATTKCN- TPPTT1.38691.15170.16430.1364

TBATG - B20.01240.00330.00150.0004

TBATG - B30.01430.00380.00170.0004

B2 - B10.01560.00410.00180.0005

B3 - B40.01190.00310.00140.0004

TBATG - B50.08940.02350.01060.0028

Dng in ngn mch ti im N2-2

EMBED Equation.DSMT4

Tnh ton tng t cho cc im khc ta c kt qu:

Bng 4.29 - Kt qu tnh ngn mch pha h p ca cc trm bin p phn xng.

imR, mX, mIN, kAixk, kA

N2-10.96765.337342.57108.38

N2-20.66583.786860.06152.90

N2-31.56147.679729.4775.01

N2-41.56287.680129.4775.01

N2-58.366932.53926.8717.50

4.5.4La chn v kim tra cc thit b in:

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 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 .

a. la chn v kim tra my ct, thanh dn ca trm PPTT:

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 INDng in n nh ng cho php: idm d ixk

Bng4.30 Thng s ca my ct c chn:

LoiUm (kV)Im (A)Ictm (kA)In/tn (kA/s)I (kA)

F4003612502525/140

Nh vy cc iu kin chn my ct u tha mn .

* Chn thanh dn ca trm phn phi trung tm :

Chn thanh dn ng- nhm tit din hnh mng c sn c cc thng s:

Bng 4.31- Thng s ca thanh dn

Kch thc,mmTit din mt

cc

mm2Mmen tr khng cm3Mmen qun tnh cm4Dng in cho php lu di c hai thanh, A

hbcrMt thanhHai thanhMt thanhHai thanhngNhm

75355,5669514,13,1730,153,17,611332502670

Thanh dn cho chn vt cp nn khng cn kim tra iu kin n nh ng.

b. 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/ 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/, ngoi chc nng thng thng 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 4.32 Thng s k thut ca BU loi 4MS36

Thng s k thut

Udm kV36

U chu ng tn s cng nghip 1' ,kV70

U chu ng xung 1,2/50 s , kV170

U1dm , kV35/

U2 dm ,V120/

Ti nh mc , VA400

Trng lng , kG55

c. La chn v kim tra my bin dng in 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

Dng in s cp nh mc : IdmBI

Chn BI loi 4ME16 kiu hnh tr do hng Siemens ch to

Bng 4.33 Thng s k thut ca BI loi 4ME16

Thng s k thut4ME16

Udm, kV36

U Chu ng tn s cng nghip 1', kV70

U Chu ng xung 1,2/50s kV170

I1 dm , A5-1200

I2 dm, A1 hoc 5

I nhit1s , kA80

I ng , kA120

d. La chn chng st van:

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