cua toi

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Trng i hc in lc n cung cp in

N Thit k cung cp in cho mt phn xng sn xut cng nghip

A. biTheo vn a, b, c cah v tn ngi thit k, ta tra bng cho v c cc s

liu tnh ton nh sau :

alphab s hiu phng

n

Sk,

MVAH,m L,m TM,h

k 2 B

v 10,23 3,8

T 85 4480

T l ph ti in loi 1 v 2 l 85%; Hao tn in p cho php trongmng in h pUcp =3,5%;h s cng sut cn nng nn lcos=0,92,H s chit khu i=12%,Thi gian s dng cng sut cc i TM,h;

Cng sut ngn mch ti im u in Sk,MVA;Thi gian tn ti ca dngngn mch tk=2,5s,Khong cch t ngun in n in n phan xng lL,m,chi cao phn xng la H,m, Gi thnh tn tht in nngc=1000d/kWh; Sut thit hi do mt in gth=7500d/kWh, n gi t b

200,103

/KVA,chi phi vn hnh t bng 2% vn u t , tn tht trongtb=0,0025 Kw/KVAr, Gi in trung bnh g=1000/KWh, in p li

phn phi l 22KV,Cc tham s khc ly trong ph lc v s tay thit k cungcp in,

Thit k cung cp in cho mt phn xng c kh sa cha N 0 2 ,phngn B, Gm cc thitbvi cc tham s cho trong bng sau

Bng s liu cc thit b:s hiu trn s Tn thit b H s ksd Cos Cng sut t P (kW)

(1) (2) (3) (4) (5)1; 2; 3; 4 L in kiu tng 0,35 0,91 18+25+18+255;6 L in kiu bung 0,32 0,92 40+55

7;12;15 Thng ti 0,3 0,95 1,1+2,2+2,88;9 l in kiu tng 0,26 0,86 30+2010 B kh m 0,47 1 1,5

11;13;14 Bn un nc nng 0,3 0,98 15+22+3016; 17 Thit b cao tn 0,41 0,83 32+2218;19 ma qut 0,45 0,67 11+5,5

20;21;22 My mi trn vn 0,47 0,6 2,8+5,5+4,5

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Trng i hc in lc n cung cp innng

23;24 My tin 0,35 0,63 2,2+4,5

25;26;27 My tin ren 0,53 0,69 7,5+12+1228;29 My phay dng 0,45 0,68 4,5+12

30;31 My khoan ng 0,4 0,60 405,5+7,532 Cn cu 0,22 0,65 7,533 My mi 0,36 0,872 3

B,Ni dung tnh ton :- Tnh ton chiu sng cho phn xng- Tnh ton ph ti in- Xc nh s cp in ca phn xng- La chn v kim tra cc thit b ca s in

- Tnh ton ch mng in- Tnh chn t b nng cao h s cng sut- Tnh ton ni t v chng st- D ton cng trnh,

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6

7

5

4

3

2

1

A B C D E

2 31

17

18

19

20

21

22

29

33

23

24

27

11

109

26

25

8

7

13

14

12

4

600

0

36000

600024000

5

6

30

31

32

16 15

Vn

phngNh kho

28

S mt bng phn xng

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Trng i hc in lc n cung cp inM U

Ngy nay, in nng l mt ththit yu n tham gia vo mi lnh vc

ca cuc sng t cng nghip n sinh hot, Bi v in nng c nhiu u

im nh: d dng chuyn thnh cc dng nng lng khc (nhit, c, ho)

d dng truyn ti v phn phi , Chnh v vy in nng c ng dng rtrng ri,

in nng l ngun nng lng chnh ca cc ngnh cng nghip, l iu

kin qun trng pht trin cc th v khu dn c, V l do khi lp k

hoc pht trin kinh t x hi, k hoch pht trin in nng phi i trc mt

bc, nhm tho mn nhu cu in nng khng nhng trong giai on trc

mt m cn d kin cho pht trin trong tng lai,iu ny i hi phi c h

thng cung cp in an ton, tin cy sn xut v sinh hot,

c bit hin nay theo thng k s b in nng tiu th bi cc x nghip

chim t l hn 70% in nng sn xut ra,

iu chng t vic thit k h thng cung cp in cho nh my, x

nghip l mt b phn ca h thng in khu vc v quc gia, nm trong h

thng nng lng chung pht trin theo quy lut ca nn kinh t quc dn,

Ngy nay do cng nghip ngy cng pht trin nn h thng cung cp in x

nghip, nh my cng phc p bao gm cc li in cao p (35 -500kV), li

in phn phi (6-22kV), v li in h p trong phn xng (220-380-600V),

Mt phng n cung cp in hp l l phi kt hp mt cch hoi ho cc

yu cu v kinh t, tin cy cung cp in, an ton cao, ng thi phi

m bo tnh lin tc cung cp in, tin li cho vic vn hnh, sa cha khi

hng hc v phi m bo c cht lng in nng nm trong phm vi cho

php,Hn na phi thun li cho vic m rng v pht trin trong tng lai,

thit k c th i hi ngi k s phi c tay ngh cao v kinh

nghim thc t, tm hiu bit su rng v th thit k l mt vic lm kh,n mn hc chnh l mt bi kim tra kho st trnh sinh vin v gip cho

sinh vin c vn kin thc nht nh cho cng vic sau ny, n cung cp

in cho mt phn xng sn xut cng nghip,th s thits thc khi t nc

ta ang tin hnh cng nghip ha hin i ha t nc, nht la giai on

khng hong kinh t hin nay, Mt bn thit k tt khng nhng mang li s

an toan trong vn hnh xa ch ci to m cn gim bt chi ph tit kim cho

nen kinh t nht la trong giai on bo gi nh hin nay,

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Trng i hc in lc n cung cp inTrong qu trnh lm n, em xin chn thnh cm n cc thy c gio,

c bit cm n thy gio Trn Quang Khnh hng dn tn tnh gip

em hon thnh n ny,

Sinh vin:T vn khnh

CHNG I :TNH TON CHIU SNG CHO PHN XNG,

nh sng to iu kin cho s lin h gia c th ngi v mi trngxung quanh, truyn n 80% thng tin, ctc ng sinh hc v trng lc rtmnh, nh sng t nhin c tc ng n c th ln hn so vi nh sng nhnto v n cha tia cc tmnhiu hn,

Khi nh sng khng , dn n cm gic khng tin li ngi lm gim

tnh nng ng ca h thn kinh trung ng, tng s mt mi, di s tc nglu di ca nh sng yu s dn n bnh cn th, mt cng chiu sngxc nhnhiu loi vi trng v siu vi trng s b tiu dit, tuy nhin, nh sngyu li c th to iu kin cho chng hot ng mnh hn, dn n d bnhim bnh, lm suy gim sc kho v gim nng sut lao ng ,

sng qu cao cng c th dn n gim nhn r do hiu ng chilo, S chi lo qua ngng gii hn thng dn n nhng tai nn ng tic ,Vic b tr chiu sng thiu tin nghi l mt trong nhng nguyn nhn quantrng dn n tai nn lao ng, V d do c hiu ng nhp nhy, nn di nh

sng n hunh quang, s chuyn ng quay trn ca thit b s b cm nhnsai lch, mt tc quay nht nh ca ng c in, di nh sng nhunh quang, ngi lao ng s ko th nhn bit c s hot ng ca n, do rt d xy ra nhng thao tc nguy him , Do vy ta cn tnh ton chiu sngsao cho hp l, m bo cc tiu chun v iu kin cho php b tr chiusng c tin nghi nht,

Sau y ta tnh ton chiu sng cho phn xng c kh sa cha c kchthc a,b,H l 36;24;3,8 m,

V phn xng c nhiu my in quay nn ta chn n si t vi cngsut 200W v quang thng Fd = 3000 lumen

Chn cao treo n l ' 0,5h m

Chn chiu cao ca mt bng lm vic l , 2 0,8h m

=> Chiu cao tnh ton : 2 3,8 0,8 3h H h m

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,

T ta c t s treo n l' 0,5

0,1429' 3 0,5

hj

h h

Vi loi n dng chiu sng cho phn xng sn xut cng ngip thkhong cch gia cc nc xc nh theo t l: L/h=1,5 (bng 2,11/bo hlao ng v an ton in) : 1,5. 1,5.3 4,5L h m

Cn c v kch thc nh xng l 36x24m ta chn khong cch gia ccn theo chiu dc v chiu ngang ln lt l : Ld = 4m v Ln = 4,5m, T tac khong cch t cc ng bin l

Kim tra iu kin ta c :

3 2

d dL Lq v3 2

n nL Lp

=>4 4

2

3 2

v4,5 4,5

2,25

3 2

(tho mn),

Nh vy vic b tr n l hp l, Ta b tr 7 hng n theo chiu dc v 5 hng n theo chiu ngang, Vy s lng n ti thiu l Nmin= 35 n s m

bo yu cu v ng u ca chiu sng,Ta c s b tr n nh sau :

h'

h2

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-Xc nh h s khng gian :. 36.24

4,8.( ) 3.(36 24)

kga b

kh a b

Tng quang thng c xc nh bng biu thc :

. .

.

yc dt

ld

E S k F lm

k

Trong : Eyc : ri yu cu, (lx), y ly Eyc = 50lxS : Din tch b mt chiu sng, (m2),: Hiu sut ca n,kdt : H s d tr,kld : H s li dng quang thng ca n,

Cn c vo c im ca ni tht chiu sng c th coi h s phn x catrn l 0,5; ca tng l 0,3, Xc nh h s li dng nh sng tng ng vih s khng gian 4,8 l kld=0,595 (tra bng 2, pl/bo h lao ng v an tonin) , ly h s d tr l kdt= 1,2 v h s hiu dng ca n l =0,58

Thay s ta c :

. . 50.36.24.1,2150217,33

. 0,58.0,595

yc dt

ld

E S k F lm

k

S lng n cn thit m bo ri yu cu l :

min150217,33

50,07 353000d

FN N

F

n

Nh vy tng s lng n cn lp t s l 56 bng c b trtheo s :

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Kim tra ri thc t ng vi 56 bng n chn ta c :

. . . 3000.56.0,58.0,595

55,92. . 36.24.1,2

d ldyc

dt

F N kE lx E

a b k

Ngoi chiu sng chung ta cn trang b thm: cho mi my mt bng ncng sut 100W chiu sng cc b,

CHNG II : TNH TON PH TI IN,

Trong phn xng sa cha c khcng nghip c b tr 33thit b,

cng sut ca ccthit b rt khc nhau, thit b c cng sut ln nht l 55KW

song cng c nhiu thit b cng sut rt nh (c vi kW), Phn ln cc thit b

c ch lm vic di hn

Nhng c im ny cn lu khi phn nhm cc ph ti, xc nh ph

ti tnh tonv l chn phng n thit k cp in cho phn xng ,

2,1 Xc nh ph ti tnh tonca cc nhm ph ti,

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 qu pht nhit hoc mc hu hoi

cch in,Ni cch khc, ph ti tnh ton cng t nng thit b ln ti nhit

tng t nh ph ti thc t gy ra, v vy chn cc thit b theo ph ti

tnh ton s m bo an ton cho thit b v mt pht nng ,Ph ti tnh ton

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Trng i hc in lc n cung cp inc s dng la chn v kim tra cc thit b trong h thng cung cp

in,

2,1,1 Ph ti chiu sng,

Cng sut chiusng chung (coi h s ng thi l 1): csch 200.56 11200 W 11, 2( W)P k

Cng sut chiu sng cc b:

csch 100.33 3300 W 3,3( W)P k Vy tng cng sut chiu sng cho phn xng l:

csch 11,2 3,3 14,5( W)cs cbP P P k V dng bng n si t nn h s cos=1,

2,1,2 Ph ti thng thong v lm mt,

Phn xng s c trang b 24 qut trn mi qut c cng sut l

120W v 12 qut ht bi 80W; H s cng sut trung bnh ca nhm l 0,8 ,

Nh vy tng cng sut thng thong v lm mt l:

24.120 12.80 3840 3,84lmP W kW

2,1,3 Ph ti ng lc,

Phn nhm ph ti ca phn xng c kh- sa cha,

Trong mt nhm phn xng thng c nhiu thit b c cng sutv thit b lm vic khc nhau, mun xc nh ph ti tnh ton c chnhxc cn phi phn nhm thit b in, Vic phn nhm cn phi tun theocc nguyn tc sau:

- Cc thit b in trong cng nhm nn ngn nhau gim chiudi ng dy h p,Nh vy c th tit kimc vn u t v tn thttrn cc ng dy h p trong phn xng,

- Ch lm vic ca cc thit b in trong nhm nn ging nhau tnh ton c chnh xc hn v thun tin cho vic la chn phng thccung cp in cho nhm,

- Tng cng sut ca cc nhm nn xp x nhau gim chng loit ng lc cn dng trong phn xng v ton nh my , S thit b trongmt nhm cng khng nn qu nhiu bi s u ra ca cc t ng lcthng (812)

Tuy nhin thng rt kh tho mn tt c cc nguyn tc trn, Do vyngi ta thit k phi tu thuc vo iu kin c th ca ph ti la chn ra

phng n ph hp nht trong cc phng n c th ,

Da vo nguyn tc phn nhm in trn v cn c vo v tr, cngsut ca cc thit b c b tr trn mt bng phn xng, c th chia cc

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Trng i hc in lc n cung cp inthit b trong phn xng thnh nhng nhm sau , Kt qu phn nhm ph tic trnh by theo bng 2,1:

Trong ta c:

3.

dmdm

SI

U v

osdm

PS

c

ly U = 0,38 kV,

bng 2,1

K hiu trn mtbng,

P Sdm Idm

TT Tn nhm v thitb

(kW) cos (kVA) (A)

-1 -2 -3 -4 -5 -6 -7

NHM 1

1 L in kiu tng 1 18 0,91 19,78 30,053

2 L in kiu tng 2 25 0,91 27,473 41,742

3 L in kiu tng 3 18 0,91 19,78 30,053

4 L in kiu tng 4 25 0,91 27,473 41,742

5 L in kiubung

5 40 0,92 43,478 66,06

6 L in kiubung

6 55 0,92 59,783 90,834

7 Thng ti 7 1,1 0,95 1,158 1,759

8 Bn un ncnng

11 15 0,98 15,306 23,256

Cng theo nhm1

197,1 214,23 325,5

NHM 2

1 L in kiu tng 8 30 0,86 34,884 53,0022 L in kiu tng 9 20 0,86 23,256 35,335

3 B kh m 10 1,5 1 1,5 2,279

4 Thng ti 12 2,2 0,95 2,316 3,5195 Bn un nc

nng13 22 0,98 22,449 34,109

6 Bn un ncnng

14 30 0,98 30,612 46,511

Cng theo nhm2 105,7 115,02 174,76

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Trng i hc in lc n cung cp inBng 2,2

Theo phng php h s nhu cu ta c:K hiu

trn

mtbng,

P Sdm Idm Ksd PiKsdi Pi,

cos

P

TT Tn nhm

v thit b

(kW) cos (kVA

)

(A)

-1 -2 -3 -4 -5 -6 -7

NHM 1

1 L inkiu tng

1 18 0,91 19,78 30,053 0,35 6,3 16,38

2 L inkiu tng

2 25 0,91 27,473

41,742 0,35 8,75 22,75

3 L in

kiu tng

3 18 0,91 19,78 30,053 0,35 6,3 16,38

4 L inkiu tng

4 25 0,91 27,473

41,742 0,35 8,75 22,75

5 L inkiu bung

5 40 0,92 43,478

66,06 0,32 12,8 36,8

6 L inkiu bung

6 55 0,92 59,783

90,834 0,32 17,6 50,6

7 Thng ti 7 1,1 0,95 1,158 1,759 0,3 0,33 1,045

8 Bn un

nc nng

11 15 0,98 15,30

6

23,256 0,3 4,5 14,7

Cng theonhm 1

197,1 214,23

325,5 65,33 181,405

67

H s s dng tng hp:. 65,33

0,331197,1

i sdisd

i

P kk

P

S lng hiu dng:

22

2

197,15,755

6749,21

i

i

Phd

Pn

T ta c h s nhu cu:1 1 0,331

0,331 0,6095,755

sdnc sd

hd

kk k

n

Tng cng sut ph ti ng lc:

1 . 0,609.197,1 120,034( )dl nc iP k P kW H s cng sut ca ph ti ng lc:

1

1

. os 181,405os 0,921

197,1

sin 0,389

i itb

i

tb

P cc

P

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Trng i hc in lc n cung cp inCng sut biu kin:

111

120,034130,33

os 0,921

dldl

tb

PS kVA

c

T ta c cng sut phn khng:

1 1 1.sin 130.33.0,389 50,69 Ardl dl tbQ S kV

1 120,034 50,69dlS j kVA

2,Nhm 2,

S liu ph ti ca nhm 2 cho trong bng 2,3:

Bng 2,3

5 Bn unnc nng

13 22 0,98 22,449 34,109 0,3 6,6 21,56

4

6 Bn un

nc nng

14 30 0,98 30,612 46,511 0,3 9 29,4 9

Cng theonhm 2

105,7 115,02 174,76 29,965

97,55

26

Tnh ton tng t nhm 1 ta c:H s s dng tng hp: 0,283sdk S lng hiu dng: 4,15hdn

T ta c h s nhu cu: 0,635nck

TT Tn nhm

v thit b

K

hiutrnmt

bng,

P Sdm Idm Ksd Pi,Ksdi

Pi,

cos

Pi2

(kW) cos

(kVA) (A)

NHM 21 L in

kiu tng8 30 0,86 34,884 53,002 0,26 7,8 25,8 9

2 L in

kiu tng

9 20 0,86 23,256 35,335 0,26 5,2 17,2 4

3 B kh m 10 1,5 1 1,5 2,279 0,47 0,705

1,5 2

4 Thng ti 12 2,2 0,95 2,316 3,519 0,3 0,66 2,09 4

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Trng i hc in lc n cung cp inTng cng sut ph ti ng lc: 2 67,119( )dlP kW H s cng sut ca ph ti ng lc: 2os 0,923tbc

2sin 0,385tb Cng sut biu kin: 2 72,718dlS kVA

T ta c cng sut phn khng: 2 27,996 ArdlQ kV 2 67,119 27,996dlS j kVA

3,Nhm 3,


Bng 2,4

Tnh ton tng t nhm 1 ta c:

H s s dng tng hp: 0,414sdk

S lng hiu dng: 3,223hdn


Tng cng sut ph ti ng lc: 3 54,242( )dlP kW

H s cng sut ca ph ti ng lc: 3os 0,798tbc

3sin 0,603tb

TT Tn

nhm vthit b

Khiu

trnmtbng,

P

cos

Sdm Idm Ksd Pi,ksdi

Pi,cos

Pi2

(kW) (kVA) (A)NHM 3

1 Thng ti 15 2,8 0,95 2,947 4,478 0,3 0,84 2,66 72 Thit b

cao tn16 32 0,83 38,55 58,58 0,41 13,12 26,56 10

3 Thit bcao tn

17 22 0,83 26,51 40,27 0,41 9,02 18,26 4

4 My qut 18 11 0,67 16,42 24,95 0,45 4,95 7,37 15 My qut 19 5,5 0,67 8,209 12,47 0,45 2,475 3,685 30

Cngtheonhm 3

73,3 92,63 140,8 30,405 58,535 1667

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Trng i hc in lc n cung cp inCng sut biu kin: 3 67,972dlS kVA

T ta c cng sut phn khng: 3 40,987 ArdlQ kV

3 54,242 40,987dlS j kVA 4,Nhm 4,

S liu ph ti ca nhm 4 cho trong bng 2,5:Bng 2,5

TT

Tn nhm vthit b

K hiutrn mtbng,

P Sdm Idm Ksd Pi,ksd Pi, Pi2

(kW) cos

(kVA) (A) cos

NHM 4

1 My mi trnvn nng

20 2,8 0,6 4,667 7,091 0,47 1,316 1,68 7,84

2 My mi trnvn nng

21 5,5 0,6 9,167 13,928 0,47 2,585 3,3 30,2

3 My mi trnvn nng

22 4,5 0,6 7,5 11,395 0,47 2,115 2,7 20,2

4 My tin 23 2,2 0,63 3,492 5,306 0,35 0,77 1,386

4,84

5 My tin 24 4,5 0,63 7,143 10,853 0,35 1,575 2,835

20,2

6 My tin ren 25 7,5 0,69 10,87 16,516 0,53 3,975 5,175

56,2

7 My tin ren 26 12 0,69 17,391 26,424 0,53 6,36 8,28 144

8 My khoan ng 30 5,5 0,6 9,167 13,928 0,4 2,2 3,3 30,2

Tnh ton tng t nhm 1 ta c:

H s s dng tng hp: 0,469sdk




Cng theonhm 4

44,5 69,397 105,4 20,896 28,656

31

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Trng i hc in lc n cung cp inH s cng sut ca ph ti ng lc: 4os 0,645tbc

4sin 0,764tb

Cng sut biu kin: 4 46,915dlS kVA T ta c cng sut phn khng:

4 35,843 ArdlQ kV

4 30,26 35,843dlS j kVA 5,Nhm 5,


NHM 5TT Tn nhm v

thit biK

hiutrnmtbng

p cos

Sdm Idm Ksd Pi,Ksdi

Picos

Pi2

1 My tin ren 27 12 0,69 17,39 26,424 0,53

6,36 8,28 14

2 My phayng

28 4,5 0,68 6,618 10,055 0,45

2,025

3,06 20,2

3 My phayng

29 12 0,68 17,64 26,813 0,45

5,4 8,16 14

4 My khoanng

31 7,5 0,6 12,5 18,992 0,4 3 4,5 56,2

5 Cn cu 32 7,5 0,65 11,53 17,531 0,22

1,65 4,875 56,2

6 My mi 33 2,8 0,872

3,211 4,879 0,36

1,008

2,442 7,8

Cng theonhm 5

46,3

68,905

104,69 19,443

31,317

428,

Tnh ton tng t nhm 1 ta c:H s s dng tng hp: 0,419sdk




H s cng sut ca ph ti ng lc: 5os 0,676tbc

5sin 0,737tb

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Trng i hc in lc n cung cp inCng sut biu kin: 5 46,435dlS kVA T ta c cng sut phn khng:

5 34,222 ArdlQ kV

5 31,39 34,222dlS j kVA

2,2 Tng hpph ti ca phn xng,

Nhmphti

Sdli Pdli Qdli Costbi

Ksdi

1 130,33 120,03 50,69 0,921 0,331 39,731 110,55 14408

2 72,718 67,199 27,996 0,923 0,283 19,017 62,025 4515,73 67,972 54,242 40,987 0,798 0,414 22,456 43,285 2942,4 46,915 30,26 35,843 0,645 0,469 14,192 19,518 915,65 46,435 31,39 34,222 0,676 0,419 13,152 21,22 985,3 303,13 108,548 256,6 23767

*-Tng hp ph ti ng lc ca cc nhm ta c:Theo phng php h s nhu cu ta c:

H s s dng tng hp:. 108,548

0,358303,13

i sdisd

i

P kk

P

T ta c h s nhu cu:1 1 0,358

0,358 0,665

sdnc sd

kk k

N

Tng cng sut ph ti ng lc:

. 0,66.303,13 200,065( )dl nc iP k P kW H s cng sut ca ph ti ng lc:

. os 256,6os 0,846303,13

sin 0,533

i itb

i

tb

P ccP

Cng sut biu kin:

200,065

236,48os 0,846

dldl

tb

PS kVA

c


.sin 236,48.0,533 126,043 Ardl dl tbQ S kV

200,065 126,043dlS j kVA

.i sdiP k . osi iP c 2

iP

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Trng i hc in lc n cung cp inBng tng hp ph ti ca phn xng:Stt Ph ti P (kw) cos1 ng lc 200,065 0,8462 Chiu sng 14,5 13 Lm mt v thng thong 3,84 0,8

*-Tng cng sut tnh ton ca 2nhm ph ti chiu sng v lm mt:p dng phng php s gia ta c:

.

0,04

.

3,8414,5 ( ) 0,41 .3,84

5

16,725

cs lm cs i lmP P k P

kW

Tng cng sut tc dngca phn xng cxc nh nh sau:

Trong :Pdli: L ph ti ng lc ca cc nhm,

ki: h s c xc nh0,04

( ) 0,415

iPi

k

Pcs,lm: Tng cng sut chiu sng v lm mt ca phn xng,Thay s ta c:

0,04

.

16,725200,065 ( ) 0,41 .16,725

5

210,76

N dl i csP P k P

kW

H s cng sut tng hp ca ton phn xng:

. os . os . osos dl tb cs cs lm lmNdl cs lm

P c P c P ccP P P

V bng n chiu sng c chn l bng n si t nn coscs=1thay s vobiu thc trn ta c:

. os . os . osos

200,065.0,864 14,5.1 3,84.0,80,872

200,065 14,5 3,84

sin 0,489

dl tb cs cs lm lmN

dl cs lm

N

P c P c P cc

P P P

..N dli i cs lmP P k P

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Trng i hc in lc n cung cp inCng sut biukin:

210,76

241,69os 0,872

N

N

PS kVA

c


.sin 241,69.0,489 118,186 ArN NQ S kV 210,76 118,186S j kVA

CHNG III :XC NH S CP IN CA PHN XNG,

3,1 Trm bin p phn xng(t phn phi trung tm),

Trm bin p l mt phn t rt quan trng ca h thng in n cnhim v tip nhn in nng t h thng, bin i t cp in p ny sang cpin p khc v phn phi cho mng in tng ng , Trong mi trm bin p

ngoi my bin p cn c rt nhiu thit b hp thnh h thng tip nhn vphn phi in nng, Cc thit b pha cao p gi l thit b phn phi cao p(my ct, dao cch ly, thanh ci) v cc thit b pha h p gi l thit b

phn phi h p (thanh ci h p, aptmat, cu dao, cu chy),Trm tng p thng c t ti ccnh my in tng in p t

0,46,3kV ln cc cp cao hn vi mc ch truyn ti in nng i xa hn;Trm bin p trung gian l trm gim p, tip nhn in nng t li 3522kV cung cp cho cc li phn phi 622kV ; Trm bin p tiu th hay trm

bin p phn xng c nhim v tip nhn in nng t mng phn phi622kV(i khi c mng 35 v 110kV) v cung cp cho li in h p ,

Kt cu ca trm bin p ph thuc vo loi trm, v tr, cngdngca chng, Cc trm bin p trung gian thng c xy dng vi haidng chnh:

- Trm bin p ngoi tri c cc thit b phn phi pha cao pc t ngoi tricc thit b phn phi pha th cp c t trong cc tin hoc t trong nh,

- Trm bin p trong nh: ton bthit b ca trmt pha s cpn pha th cp c t trong nh vi cct phn phi tng ng,

Tt c cc trm bin p cn phi tho mn cc yu cu c bn sau:

- S v kt cu phi n gin n mc c th;- D thao tc vn hnh;- m bocung cp in lin tc v tin cy vi cht lng cao;- C kh nng m rng v pht trin;- C cc thit b hin i c th p dng cc cng ngh tin tin

trong vn hnh v iu khin mng in;- Gi thnh hp l v c hiu qu kinh t cao;

Cc yu cu trn c th mu thun vi nhau, v vy trong tnh ton thitk cn phi tm li gii ti u bng cch gii cc bi ton kinh t k thut ,

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Trng i hc in lc n cung cp in3,1,1 Xc nh v tr t trm bin p phn xng,

V tr ca trm bin p c nh hng rt ln n cc ch tiu kinh t kthut ca mng in,Nu v tr ca trm bin p t qu xa ph ti th c thdn n cht lng in p b gim, lm tn tht in nng ,Nu ph ti phntn, th vic t cctrmbin p gn chng c th dn n s lng trm bin

p tng, chi ph cho ng dy cung cp ln v nh vy hiu qu kinh t sgim,V tr trm bin p thng c t lin k, bn ngoi hoc bn trong

phn xng,Trm bin p t bn ngoi phn xng, hay cn gi l trm c lp,

c dng khi trm cung cp cho nhiu phn xng hoc khi cn trnh cc ni,bi bm c kh n mn hoc rung ng, Trm bao gm cc thit b phn phi phacao p c t ngoi tri cn cn cc thit b phn phi pha th cp c ttrong cc t in hoc t trong nh,

Trm xy dng lin k c dng ph bin hn c v tit kim v xy dng

v t nh hng ti cc cng trnh khc,Trm xy dng bn trong c dng khi phn xng rng c ph ti ln,

Khi s dng trm ny cn m bo tt iu kin phng n, phng chy cho trm,Ton b thit b ca trm t pha s cp n pha th cp c t trong nh vicc t phn phi tng ng,

Sau y 2 phng n t trm bin p phn xng :Phng n 1:t trm bin p ti trung tm ph ti v t ko n t

phn phi ca phn xng,Phng n 2: t trm bin pti gc xng v ko ng cp n t phn

phi ca phn xng, la chn mt trong hai phng n ta tnh ton v la chn theo cc chtiu kinh t k thut ca h thng cung cp incho tng phng n a ra,- Phng n 1: t trm bin p ti trung tm ph ti,

Chn dy dn t trm bin p n phn xng l dy cp ng ba pha,c lp t trong rnh,

Tit din dy dn cao p n phn xng c th chn theo mt kinht, Cn c vo s liu ban u ng vi TMax=4480h ca dy cp ng ta cJkt=3,1 A/mm

2, (Tra bng 9,pl sBT),

Khi dng in chy trn ng dy l :

241,69

6,3433. 3.22

SI A

U

Tit din dy dn cn thit l :

26,343 2,0463,1kt

IF mm

J

i vi ng dy 22(kV) tit din ti thiu khng nh hn 35mm2 nn:

Ta chn cp AC35c r0 = 0,92 v x0 = 0,414 /km ( bng 5bt,pl )

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Trng i hc in lc n cung cp inXc nh tn hao in p thc t :

. ..

210,76.0,92 118,186.0,414.0,085 0,938

22

o o

N

P r Q xU L

U

V

Trong L l chiu di dy dn t ngun in n trung tm ph ti vcng l n t phn phi caphn phi ca phn xng, L=85m

Tn tht in nng

2 2

2 23

2

. . .

210,76 118,186.0,92.0,085.2866.10

2227,036 / n m

oN

P QA r L

U

kWh

Trong :

: thi gian tn tht ln nht, ph thuc vo ph ti ( th ph ti) v tnh chtca ph ti v c tnh bng cng thc:

= (0,124 + Tmax10-4)28760 h

Vi Tmax: thi gian s dng ph ti ln nht, Tmax = 4480 h4 2

ax

4 2

(0,124 .10 ) .

(0,124 4480.10 ) .8760 2866( )

mT t

h

Chi ph tn tht in nng khi s l:

C= A,C =27,036,1000=0,027036 /nm)Trong cl gi thnh tn tht in nng,c=1000 /kWh,

Vn u t cho on dy:6 6

. 80,57.10 .0,085 6,848.10oV v L ()

Trong , h s tiu chun s dng vn u t:

1)1(

)1(

h

h

T

T

tci

iia

25

25

0,12(1 0,12)0,1275

(1 0,12) 1

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Trng i hc in lc n cung cp inChi ph quy i:

6 6

6

.

0,02 0,1275 .6,848.10 0,027036.10

1,037.10

vh tcZ a a V C

-Phng n 2: t trm bin p tigc phn xng,-Tng t phng n 1 ta chn dy dn t trm bin p n phn xng

l dy cp ng ba pha, c lp t trong rnh,Tit din dy dn cao p n phn xng c th chn theo mt kinh t, Cnc vo s liu ban u ng vi TMax=4480h ca dy cp ng ta cJkt=3,1A/mm



241,696,343

3. 3.22

SI A

U


26,343 2,0463,1kt

IF mm

J

T ta chn cp AC35 c ro = 0,92 v xo=0,414 (/km),Chiu di dy dn t ngun in n th phn phi chnh ca phn xng l :

2 2 2 285 85 10,119 13,837 67,57L X Y m X,Y l to tm ph ti v c tnh ton chng sau,

Xc nh tn hao in p thc t :

. ..

210,76.0,92 118,186.0,414.0,068 0,75

22

o o

N

P r Q xU L

U

V

Tn tht in nng :

2 2

2 23

2

. . .

210,76 118,186.0,92.0,068.2866.10

22

21,62 / n m

oN

P QA r LU

kWh

Trong :

: thi gian tn tht ln nht, ph thuc vo ph ti ( th ph ti) v tnh cht

ca ph ti v c tnh bng cng thc: = (0,124 + Tmax.10

-4)2.8760 h

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Trng i hc in lc n cung cp inVi Tmax: thi gian s dng ph ti ln nht, Tmax = 4480 h

4 2ax

4 2

(0,124 .10 ) .

(0,124 4480.10 ) .8760 2866

mT t

h

Chi ph tn tht in nng khi s l:6. 21,62.1000 0,02162.10C Ac (/nm)

Trong cl gi thnh tn tht in nng,c=1000/kWh,Vn u t cho on dy:

6 6. 80,57.10 .0,095 5,478.10oV v L ()

Chi ph quy i:

6 6

6

.

0,02 0,125 .5,478.10 0,02162.10

0,8159.10

vh tcZ a a V C

T nhng tnh ton trn ta thy chi ph quy dn ca phng n 2nhhn phng n 1 hn na trong phm vi n thit k do din tch phnxng hp li b tr nhiu thit b nn ta chn phng n 2: t trm binp ti gc phn xng lm phng n thit k ,Sau y ta tnh ton i dyv chn tit din t ngun cp n trm bin p cho phng n 2 chn,3,1,2 Chn cng sut v s lng my bin p,

Cng sut ca my bin p v s lng chng trong mi trm l cc tham

s quan trng quyt nh ch lm vic ca mng in, Cng sut ca mybin p trong iu kin lm vic bnh thng phi m bo cung cp in choton b nhu cu ph ti, thun tin cho vic vn hnhtrm bin p, khngnn chn nhiu loi my trong mt trm, Tt nht l ch nn chn mt gamcng sut my bin p, tuy nhin trong thc t i khi kh c th p ngc yu cu trn, lc phi chn cc my khc nhau, nhng nu nh vycng ch nn chn hai loi my, Vic chn s lng my bin p c lin quann ch lm vic ca trm, Hai nhn nh hng quyt nh n bi tonchn my bin p l nhit mi trng xung quanh v th ph ti , Thngthng loi my bin p hai cun dy c s dng rng ri trong cc x

nghip, nh my v cc trm bin p trung gian , My bin p ba cun dy chs dng cc trm trung gian chnh c cng sut ln,

Trm bin p phn xng lm nhim v bin i in p 22 kV ca mngcao pphn phi thnh in p 380/220V cung cp in cho phn xng ,Nhvy ta chntrm bin p 22/0,4kV cho phn xng ,

S lng my bin p c xc nh trn c s gii bi ton kinh t kthut, Thng thng cc trm bin p tiu th s lng my bin p cchn t mt n hai my bin p,Nu chn hai my bin p trong mt trm thcn phi xt n kh nng chu quti ca my khi my th hai b s c, Lc

my bin p cn li s gnh ton b ph ti ca trm bin p, Vic la chns lng v cng sut my bin p cn xt n khng ch v kinh t m c v

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Trng i hc in lc n cung cp intnh lin tc v tin cy cung cp in li gii ti u c th nhn c bngcch so snh cc phng n theo chi ph quy i :

. .BAZ pV c A Y Trong :

VBA - vn u t my bin p ; p - h s s dng tiu chun ;Y- thit hi do mt in, Y=gth,Ath=gth,Pth,tf ,gthn gi thit hi do mt in(/kW), i vi x nghip cng nghipc th ly gth=4500(/kW),Ath - in nng thiu ht trong nm, (kWh),Pth - cng sut thiu ht trong thi gian mt in tf,tf - thi gian mt in, i vi trm bin p trung gian t f=12 v vi trmtiu th tf=24 h/nm,

Sau y ta tin hnh chn s lng v cng sut my bin p cho phnxng,

Chn cng sut v s lng my bin p,Ta c : Stt = 241,69kVA

costb= 0,872Trong ph ti loi I v II l 85% (m1+2=0,85)Thigian s dng cng sut cc i l TM = 4480hGi thnh tn tht in nng c=1000/kWhSut thit hi do mt in l gth=7500/kWh,

H s in kn bn xc nh theo biu thc :

4480 0,5114 0,758760 8760

tb Mdk

M

S TkS

Nh vy My bin p c th lm vic qu ti 40% trong khong thi giancho php khng qu 6h,

Cn c vo s liu cho trc v s liu tnh ton ta tin hnh so snh3phng n sau :

Phng n 1: Chn hai my bin p cng sut 2x180kVA,Phng n 2 : Chn mt my bin p cng sut 250kVA,Phng n 3 : Chn mt my bin p cng sut 350kVA,

Cc tham s ca my bin p nh sau

Sm, kVA P0 , kW Pk, kW Vn u t 106VN

2 180 0,53 3,15 126250 0,64 4,1 78320 0,72 4,85 86

Xt v k thut, cc phng nkhng ngang nhau v tin cycung cpin: i vi phng n 1, khi c s c mt trong hai my bin p th my

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Trng i hc in lc n cung cp inbin p cn li phi ngnh ton b ph ti loi I v II ca phn xng, i viphng n 2 v phng n 3 s phi ngng cung cp in cho cc h tiu thkhi c s c trong my bin p, m bo s tng ng v k thut ca cc

phng n cn phi xt n thnh phn thit hi do mt in khi c s c xyra trong my bin p, Trc ht ta kim tra kh nng qu ti ca my bin pkhi mt trong hai my b s c,

Ph titrong thi gian s c mt my bin p bao gm ph ti loi I v II ,

(1 2). 241,69.0,85 205,43( )sc tt S S m kVA

H s qu ti :205,43

1,138 1,4180

scqt

n

Sk

S

Nh vy my c th chu c qu ti trong qu trnh xy ra s c,Xc nh chi ph quy i ca cc phng n: thit hi do mt in, Coi s

thit hi i vi cc ph ti loi III cc phng n l nh nhau, ta ch xt nthit hi do mt in i vi ph ti loi I v II,

- i vi phng n 1: coi thit hi bng 0, Y= 0,- i vi phng n 2 v 3 ta c:

Cng sut thiu ht khi mt in bng cng sut loi I v II nn ta cthithi do mt in phng n 2 v 3 l

2

6

. . . . os .

7500.205,43.0,872.24 32,176.10 / n m

th th f th sc tb f Y g P t g S c t

tf l thi gian mt in ngtrca cc phn t ng tr, i vi trm binp phnphi tf= 24h/nm,

Tn tht in nng trong cc my bin p xc nh theo biu thc :

2. . .( )k tto

n

P SA n P t

n S

Trong : n l s my bin p,4 2

4 2

(0,124 .10 ) .8760

(0,124 4480.10 ) .8760 2866

MT

h

thay s vo biu thc trn i vi tng phng n ta c :Phng n 1 :

21

3,15 241,692.0,53.8760 .( ) .2866 17423,8( )

2 180A kWh

Phng n 2 :

22

241,690,64.8760 4,1.( ) .2866 16588,8( )

250A kWh

Phng n 3 :

23

241,690,72.8760 4,85.( ) .2866 14236,5( )

320A kWh

Chi ph b tn tht ca 3 phng n l :

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Trng i hc in lc n cung cp in6

1 1

62 2

63 3

. 1000.17423,8 17,4238.10 ( )

. 1000.16588,8 16,5888.10 ( )

. 1000.14236,5 14,2365.10 ( )

C c A

C c A

C c A

T ta c chi ph quy i ca cc phng n :6 61 1 1 1

6 62 2 2 2

6 63 3 3 2

. (0,1475.126 17,4238 0).10 36,0088.10 ( )

. (0,1475.78 16,5888 32,176).10 60,2698.10 ( )

. (0,1475.86 14,2365 32,176).10 59,0975.10 ( )

Z pV C Y

Z pV C Y

Z pV C Y

Cc kt qu tnh ton c vit trong bng sau :

Bng 3,1,2

TT Cc tham s Phng n 1 Phng n 2 Phng n 3

1 Cng sut trm bin p(kVA),

2x180 250 320

2 Tng vn u t,

(triu ng),

126 78 86

3 Tn tht in nng,

(kWh/nm),

17423,8 16588,8 14236,5

4 Chi ph b tn tht,

(triu/nm),

17,4238 16,5888 14,2365

5 Thit hi do mt in,

(triu /nm),

0 32,176 32,176

6 Tng chi ph quy i,

(triu /nm),

36,0088 60,2698 59,0975

Nh vy ta thy phng n 1 c tng chi ph quy i thp hn phng n 2v phng n 3,Nu khng xt n tin cy cung cp in th ta rt d nhm

phng n v c vn u t v tn tht ca phng n 1 u cao hn 2

phng n kia, Vic la chn phng n dng hai my bin p cn c li l cth ct bt mt my khi ph ti qu nh, iu trnh cho my bin p lmvic non ti do gim c tn tht v nng cao cht lng in, Vi cchchn my bin p nh vy nhng nm cui chu k thit k my c th lmvic qu ti trong mt khong thi gian nht nh, nhng iu hon tonkhng nh hng n tui th cha my,

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Trng i hc in lc n cung cp ins

S nguyn l trm bin p

3,3 La chn s ni in ti u,

S ni in ca tram bin p rt a dng, ph thuc vo mc yu cuv s an ton trong vn hnh, tnh kinh t v tin cy cung cp in , Yucu v an ton vn hnh c t ln hng u v coi l s bt buckhng th thiu i vi mi s , Yu cu v tin cy v tnh kinh t nhnchung i ngc vi nhau, v vy vic dung ho cc yu cu nyl bi ton tiu c xc nh tu thuc vo tng iu kin c th ,

Do trong phm vi n thit k cp in cho mt phn xng c kh sacha gm c 5nhm thit b v ta ch t mt t phn phi nn ta ch c mts ni in duy nht t trm bin p ti t phn phi,

CHNG IV : LA CHN V KIM TRA CC THITB CA S

NI IN,

4,1 Chn tit din dy dn ca mng ng lc,4,1,1, Xc nh s b v tr ca cc thit b trong phn xng,

Trn c s phn b cc thit b taa ra hai phng n ni in nhsau :

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Trng i hc in lc n cung cp inPhng n 1:t t phn phi ti trung tm ph ti v t ko n

tng thit b,Phng n 2: t t phn phi ti gc xng v ko ng cp n tng

thit b,4,1,2,Tnh ton la chn phng n ti u,

4,1,2,1,Xc nh v tr ti u ca t ng cho mi nhm ph ti v t phnphica ton phn xng,a, V tr t phn phi ca nhm ph ti,

- Theo phng php trung tm ti ta c:To ca trng tm ph ti c coi l v tr ca t phn phi v c xc

nhtheo biu thc:. .

; ;i i i i

ii

S x S yX Y

S S

Trong :

X,Y : l to ca tm ti,xi, yi: l to ca im ti th i,Si: l cng sut ca im ti th i,

T ta c to ca t phn phi cho tng nhm ph ti l :Nhm1

PT Si Xi Yi Si,Xi Si,Yi

1 19,78 5 3 98,9 59,34

2 27,473 7 3 192,311 82,419

3 19,78 9 3 178,02 59,34

4 27,473 11 3 302,203 82,419

5 43,478 11 8 478,258 347,824

6 59,783 11 11 657,613 657,613

7 1,158 8 9 9,264 10,422

11 15,306 2 10 30,612 153,06

214,23 1947,18 1452,44

Nhm1 9,08920786 6,77980208

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Nhm2

PT Si Xi Yi Pi,Xi Pi,Yi

8 34,884 11 15 383,724 523,26

9 23,256 11 17 255,816 395,352

10 1,5 8 16 12 24

12 2,316 2 13 4,632 30,108

13 22,449 2 14 44,898 314,286

14 30,612 2 16 61,224 489,792

115,02 762,294 1776,8

Nhm2 6,62749087 15,4477308

Nhm3


15 2,947 5 19 14,735 55,993

16 38,554 2 21 77,108 809,634

17 26,506 4 25 106,024 662,65

18 16,418 2 28 32,836 459,704

19 8,209 5 29 41,045 238,061

92,634 271,748 2226,042

Nhm3 2,93356651 24,0305072

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Nhm4


20 4,667 18 3 84,006 14,001

21 9,167 23 3 210,841 27,501

22 7,5 23 9 172,5 67,5

23 3,492 14 6 48,888 20,952

24 7,143 14 11 100,002 78,573

25 10,87 23 15 250,01 163,05

26 17,391 20 13 347,82 226,083

30 9,67 14 16 135,38 154,72

69,97 1349,45 752,38

Nhm4 19,2860797 10,7528941

Nhom5


27 17,391 22 18 382,602 313,038

28 6,618 22 23 145,596 152,214

29 17,647 22 28 388,234 494,116

31 12,5 14 18 175 225

32 11,538 18 26 207,684 299,988

33 3,211 14 21 44,954 67,431

68,905 1344,07 1551,787

Nhm5 19,5061316 22,5206734

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b, T phn phi chnh,

Tng t theo phng php trng tm ph ti ta c :To ca t phn phi chnh nh sau :

.

68,905.19,506 69,97.19,286 92,634.24,03 115,02.6,627 214,23.9,0

68,905 69,97 92,634 115,02 214,23

10,119

i i

i

S XXS

.

68,905.22,52 69,97.10,75 92,634.24,03 115,02.15,447 214,23.6,77

68,905 69,97 92,634 115,447 214,23

13,837

i i

i

S YY

S

4,1,2,2 Phng n 1 :

Ta c s b tr thit b ca phn xng nh sau :(hnh 4,1,2,2)

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6

7

5

4

3

2

1

A B C D E

2 31

17

18

19

20

21

22

29

33

23

24

27

11

10

9

26

25

8

7

13

14

12

4

6000

36000

600024000

5

6

30

31

32

16 15

Vn

phng

Nh kho

28

Hnh 4,1,2,2

Chn tit din dy dn t trm bin p n t phn phi chnh ch phnxng ( on dy O),

- Chn dy dn t trm bin p n t phn phi l dy cp ng ba pha,c lp t trong rnh,

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Trng i hc in lc n cung cp inTit din dy dn cao p n phn xng c th chn theo mt kinh t, Cnc vo s liu ban u ng vi TMax=4480h ca dy cp ng ta cJkt=3,1A/mm



241,69366,2

3. 3.0,38

SI A

U


2366,2 85,873,1kt

IF mm

J

T ta chn cp XLPE-95 c ro = 0,194 v xo=0,06 (/km),Xc nh tn hao in p thc t :

. ..

210,76.0,194 118,186.0,06.0,016 2,013

0,38

o oOD

N

P r Q xU L

U

V

Trong L l chiu di dy dn t trm bin p n t phn phi ca phnphi ca phn xngv L c xc nh :

2 2 2 210,119 13,837 17,136L X Y m Tn tht in nng

2 2

2 23

2

. . .

210,76 118,186.0,194.0,016.2866.10

0,38

3574,689 / n m

OD o

N

P QA r LU

kWh

Trong :

: thi gian tn tht ln nht, ph thuc vo ph ti ( th ph ti) v tnh cht

ca ph ti v c tnh bng cng thc: = (0,124 + Tmax10

-4)28760 hVi Tmax: thi gian s dng ph ti ln nht, Tmax = 4480 h

4 2ax

4 2

(0,124 .10 ) .

(0,124 4480.10 ) .8760 2866

mT t

h

Chi ph tn tht in nng khi s l:6

. 3574,689.1000 3,574.10ODC Ac (/nm)

Trong cl gi thnh tn tht in nng,c=1000/kWh,Vn u t cho on dy:

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Trng i hc in lc n cung cp in6 6

. 153,72.10 .0,016 2,459.10OD oV v L ()Chi ph quy i:

6 6

6

.

0,02 0,1275 .2,459.10 3,574.10

3,937.10

OD vh tcZ a a V C

- Xc nh tit din dy dn t t phn phi chnh n t phn phi ca ccnhm v n cc thit b:

Nhm 1,

Chn dy dn n nhm 1 l cp ng ba pha c lp t trong rnh ,Khi dng in chy trn ng dy N1 l :

11 130,33

198,01593. 3.0,38

dlDN

SI A

U


11 2198,0159

63,873,1

DNDN

kt

IF mm

J

T ta chn cp XLPE-70 c ro = 0,26 v xo=0,061 (/km),Chiu di dy dn t t phn phi chnh n t phn phi ca nhm 1 l :

1 1 1

10,119 9,089 13,837 6,779 8,088

DNL X X Y Y

m

Xc nh tn hao in p thc t :

1

1 1. . .

120,034.0,26 50,69.0,061.0,008088 0,7299

0,38

dl o dl oDN

N

P r Q xU L

U

V

Tn tht in nng trn on DN1 :

1 1

2 21 1

2 23

2

. . .

120,034 50,69.0,26.0,008088.2866.10

0,38

708,29 / n m

dl dlDN o DN

N

P QA r L

U

kWh

Chi ph tn tht in nng khi s l :

1 1

6

. 705,29.1000 0,70529.10DN DN C A c (/nm)

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Trng i hc in lc n cung cp inTrong cl gi thnh tn tht in nng,c=1000/kWh,

Vn u t cho on dy :

1 1

6 6. 124,88.10 .0,008088 1,01.10DN o DN V v L ()

Chi phquy i :

1 1 1

6 6

6

.

0,02 0,1275 .1,01.10 0,70529.10

0,8542.10

DN vh tc DN DN Z a a V C

Tng t ta c bng sau:

nhmdliS DNiI DNiF F mm

2R0 X0 V0

1130,33

198,0218 63,87799 70 0,26 0,061 124,882 72,718 110,4868 35,64091 50 0,37 0,063 98,283 67,972 103,2758 33,31477 35 0,52 0,064 79,244 46,915 71,28206 22,99421 25 0,74 0,066 64,965 46,435 70,55275 22,75895 25 0,74 0,066 64,96

nhmDNiL DNiU iDNA iDNC iDNV iDNZ

1 8,0872 0,729974 708,4892 0,708489 1,00993 0,857454

2 5,1027 0,357557 198,5839 0,198584 0,501493 0,272554

3 17,379 1,40994 829,047 0,829047 1,377112 1,032171

4 12,252 0,798251 395,9561 0,395956 0,79589 0,51335

5 18,0706 1,212026 572,3454 0,572345 1,173866 0,745491

max 1,212026

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Trng i hc in lc n cung cp in* Xc nh tit din dy dn t t phn phi chnh n t phn phi cha ccnhm ph ti:- on N1-1,Dng in chy trn ng dy N1-1 l :

1

1 1

19,78

30,053. 3.0,38N

S

I AU


21 11 1 30,05 9,693,1

NN

kt

IF mm

J

T ta chn cp XLPE-10 c ro = 1,84 v xo=0,073 (/km),Chiu di dy dn on N1-1 l :

1 1 1 1.1 1.1

9,089 5 6,77 3 7,859

NL X X Y Y

m

Xc nhtn haoin pthc t :

Tn tht in nng trn on DN1 :

2 21 1

1 1 1 1

2 23

2

. . .

18 8,2.1,84.0,007859.2866.10

0,38

112,289 / n m

N o N N

P QA r L

U

kWh

Chi ph tn tht in nng khi s l :6

1 1 1 1. 112,289.1000 0,1123.10N NC A c (/nm)Trong cl gi thnh tn tht in nng,c=1000/kWh,

Vn u t cho on dy :6 6

1 1 1 1. 46,76.10 .0,00785 0,367.10N o N V v L ()Chi ph quy i :

1 11 1

. ..

18.1,84 8,2.0,073.0,007859 0,6975

0,38

o oN

N

P r Q xU L

U

V

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1 1 1 1 1 1

6 6

6

.

0,02 0,1275 .0,367.10 0,1123.10

0,166.10

N vh tc N N Z a a V C

tnh ton tng t vi cc ng dy cn li ta c bng kt qu sau (bng4,1,2,2),

N1-i Si(kw) I N1-i F N1-i(mm

2F(mm

2)R0(/km) X0(/km) V010

6 Li m

1 19,78 30,08823

9,7058

79 10 1,84 0,073 46,76 7,8

2 27,473 41,79039

13,480

77 16 1,15 0,068 53,76 5,8

3 19,78 30,08823

9,7058

79 10 1,84 0,073 46,76 3,8

4 27,47341,7903

9

13,480

77 16 1,15 0,068 53,76 5,69

5 43,478 66,13629

21,334

29 25 0,74 0,066 64,96 3,1

6 59,783 90,93855

29,335

01 35 0,52 0,064 79,24 6,1

7 1,158 1,761485

0,5682

21 2,5 8 0,09 21,67 3,30

11 15,306 23,28263

7,5105

25 10 1,84 0,073 46,76 10,3

N1-i 1N iU v 1N iA kw/h

1N iC 106

1N iV 106

1N iZ 106

1 0,698243 112,4345 0,112434 0,367955 0,1667082 0,456001 101,1076 0,101108 0,315518 0,1476473 0,34331 55,28143 0,055281 0,180915 0,0819664 0,442139 98,03398 0,098034 0,305926 0,1431585 0,253154 86,92837 0,086928 0,203389 0,1169286 0,485632 226,1509 0,226151 0,48582 0,2978097 0,076923 0,704638 0,000705 0,071715 0,011283

11 0,75482 88,2031 0,088203 0,482068 0,159308 1,102375

max 0,75482

NN2-i Si(kw) I N2-i F N2-i(mm

2F(mm2) R0(/km) X0(/km) V010

6 Li m

8 34,884 53,002 17,09742 25 0,74 0,066 64,96 10,1

9 23,256 35,33511,398

39 16 1,15 0,068 53,76 12,1

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Trng i hc in lc n cung cp in10 1,5 2,279 0,7351

61 2,5 8 0,09 21,67 10,3

12 2,316 3,519 1,135161 2,5 8 0,09 21,67 13,3

13 22,449 34,109 11,0029 16 1,15 0,066 53,76 14,3

14 30,612 46,51115,003

55 16 1,15 0,066 53,76 16,3

N2-i2N iU v 2N iA

kw/h2N iC 10

6 2N iV 106 2N iZ 10

6

8 0,623187 181,0694 0,181069 0,658109 0,2781419 0,760007 149,7522 0,149752 0,652162 0,245946

10 0,32556 3,683114 0,003683 0,223405 0,03663512 0,618717 11,33535 0,011335 0,288415 0,053877

13 0,963808 164,5972 0,164597 0,769274 0,27806514 1,497975 348,8417 0,348842 0,876794 0,478169 0,557856

max 1,497975


2F(mm

2)R0(/km) X0(/km) V010

6 Li m

15 2,947 4,478 1,444516 2,5 0,74 0,066 64,96 7,09

16 38,55 58,58 18,89677 25 8 0,09 21,67 3,9617 26,51 40,27 12,990

32 16 1,15 0,068 53,76 2,03

18 16,42 24,95 8,048387 10 1,15 0,066 53,76 4,90

19 8,209 12,47 4,022581 6 3,33 0,09 42,28 7,03

N3-i3N iU v 3N iA

kw/h

3N iC 106 3N iV 10

6 3N iZ 106

15 0,03983 0,905258 0,000905 0,461017 0,06890516 2,690716 935,383 0,935383 0,085901 0,94805317 0,140939 32,65791 0,032658 0,109451 0,04880218 0,173602 30,17312 0,030173 0,263588 0,06905219 0,349268 31,33683 0,031337 0,297479 0,075215 1,210028

max 2,690716

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Trng i hc in lc n cung cp inNN4-i Si(kw) I N4-i F N4-

i(mm2

F(mm2)

R0(/km) X0(/km) V0106 Li m

20 4,667 7,091 2,287419 2,5 0,74 0,066 64,96 9,03

21 9,167 13,928 4,492903 6 3,33 0,09 42,28 11,4

22 7,5 11,395 3,675806 4 5 0,09 25,34 5,46

23 3,492 5,306 1,711613 2,5 0,74 0,066 64,96 10,0

24 7,143 10,853 3,500968 4 5 0,09 25,34 5,53

25 10,87 16,516 5,327742 6 3,33 0,09 42,28 7,96

26 17,391 26,424 8,523871 10 1,15 0,066 53,76 2,96

30 9,167 13,928 4,4929

03 6 3,33 0,09 42,28 10,5

N4-i4N iU v 4N iA

kw/h4N iC 10

6 4N iV 106 4N iZ 10

6

20 0,055148 2,891582 0,002892 0,587172 0,08949921 0,572587 63,68695 0,063687 0,484817 0,13519722 0,331462 30,51658 0,030517 0,138529 0,0509523 0,047737 1,797954 0,001798 0,652132 0,09798724 0,334893 28,01661 0,028017 0,140211 0,04869825 0,538063 62,17007 0,06217 0,336592 0,11181726 0,114006 20,44081 0,020441 0,159185 0,04392130 0,525967 58,50156 0,058502 0,445343 0,12419 0,702259

max 0,572587

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2F(mm2) R0(/km) X0(/km) V010

6 Li m

27 17,391 26,424 8,523871 10 1,15 0,066 53,76 7,01

28 6,618 10,055 3,243548 4 5 0,09 25,34 2,97

29 17,647 26,813 8,649355 10 1,15 0,066 53,76 7,97

31 12,5 18,992 6,126452 10 1,15 0,066 53,76 10,0

32 11,538 17,531 5,655161 6 3,33 0,09 42,28 4,98

33 3,211 4,879 1,573871 2,5 0,74 0,066 64,96 7,02

N5-i5N iU v 5N iA

kw/h5N iC 10

6 5N iV 106 5N iZ 10

6

27 0,270074 48,4234 0,048423 0,377102 0,10404628 0,179462 12,92278 0,012923 0,075341 0,02403629 0,307471 56,67362 0,056674 0,428639 0,11989831 0,244997 35,75933 0,035759 0,539041 0,11526832 0,338015 43,86513 0,043865 0,210785 0,07495633 0,040233 1,064092 0,001064 0,456461 0,068392

0,506595

max 0,338015

Tng kt phng n 1:

Z1=1DN

Z + 1NZ =0,857454+1,102375=1,9597

Z2=2DN

Z + 2NZ =0,272554+0,557856=0,83

Z3= 3DNZ + 3NZ =1,032171+1,210028=2,242

Z4= 4DNZ + 4NZ =0,51335+0,702259=1,2156

Z5= 5DNZ + 5NZ =0,745491+0,506595=1,2528

Ta c tng ch ph quy i ca phng n 1 l:

1 1 2 3 4

6 6

5

(1,9597 0,83 2,242 1,2156 1,2528 3,937).10 11,43717.10

pa ODZ Z Z Z Z Z Z

Hao tn in p cc i:

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Trng i hc in lc n cung cp in ax ax 1,212 2,69 3,9M D Ni NiU m U m U V

Hao tn in p cho php:

%. 3,5.380

13,3100 100

cpcp

U UU V

Nh vy: UM < Ucptc l mng in m bo yu cu v cht lng,

4,1,2,3 Phng n 2 :

Ta c s b tr thit b ca phn xng nh sau :(hnh 4,1,2,3)

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6

7

5

4

3

2

1

A B C D E

2 31

17

18

19

20

21

22

29

33

23

24

27

11

10

9

26

25

8

7

13

14

12

4

6000

36000

600024000

5

6

30

31

32

16 15

Vn

phng

Nh kho

28

Hnh 4,1,2,3

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T vn khnh d3h343

phng n ny do c trm bin p v t phn phi u t ti gc phn xng do

ng i dy s rt nh , vy nn ta khng xt n, Sau y ta xc nh tit din dy

dn t phn phi chnh n t ng lc ca cc nhm,

- Xc nh tit din dy dn t t phn phi chnh n t ng lc ca cc nhm vn cc thit b tng t nh phng n 1 ta c bng tng kt ca phng n 2 nh sau

(bng 4,1,2,3),

nhmdliS DNiI DNiF F mm

2R0 X0 V0

1 130,33 198,0218 63,87799 70 0,26 0,061 124,882 72,718 110,4868 35,64091 50 0,37 0,063 98,283 67,972 103,2758 33,31477 35 0,52 0,064 79,244 46,915 71,28206 22,99421 25 0,74 0,066 64,965 46,435 70,55275 22,75895 25 0,74 0,066 64,96

nhmDNiL DNiU iDNA iDNC iDNV iDNZ

1 15,8688 1,432363 1390,206 1,390206 1,981696 1,682506

2 22,0747 1,546819 859,0905 0,859091 2,169502 1,179092

3 26,964 2,187562 1286,289 1,286289 2,136627 1,601442

4 30,038 1,957058 970,7581 0,970758 1,951268 1,25857

5 42,0266 2,818796 1331,098 1,331098 2,730048 1,73378

max 2,818796

Tng kt phng n 2:

Z1=1DN

Z + 1NZ = 1,682506+1,102375=2,7848

Z2=2DN

Z + 2NZ =1,179092+0,557856=1,7369

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T vn khnh d3h344

Z3=3DN

Z + 3NZ = 1,601442+1,210028=2,81147

Z4= 4DNZ + 4NZ = 1,25857+0,702259=1,9608

Z5= 5DNZ + 5NZ = 1,73378+0,506595=2,2404

Ta c tng ch ph quy i ca phng n 2 l:

2 1 2 3 4

6 6

5

(2,7848 1,7369 2,81147 1,9608 2,2404).10 11,53437.10

paZ Z Z Z Z Z

Hao tn in p cc i:

ax ax 2,69 2,818 5,508M D Ni NiU m U m U V

Hao tn in p cho php:

%. 3,5.380

13,3100 100

cpcp

U UU V

Nh vy: UM < Ucptc l mng in m bo yu cu v cht lng

4,1,2,4 Tng kt chn phng n ti u,

So snh kt qu tnh ton ca 2 phng n ta thy phng n 1 c tng chi ph quy

i nh hn phng n 2,

S chnh lch chi ph c xc nh:

2 1

2

11,53437 11,43717.100 .100 0,8426%

11,53437

Z ZZ

Z

Nh vy v ch tiu k thut 2 phng n tng ng nhau cn v kinh t th

phng n 1chim u th r rt hn, do phng n 1l phng n ti u v c

chn lm phng n thit k,

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T vn khnh d3h345

4,2 Tnh ton mng in chiu sng,

S tnh ton chiu sng: (Hnh 4,2 a)

hnh 4,2a

Ta ch chn dy dn cho mng chiu sng chung, cn chiu sng cc b c lyin ti ch qua mng ng lc,

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T vn khnh d3h346

Do t chiu sng c t gia phn xng, nn mng in chiu sng c xydng vi 2 mch ging r v 2 pha, mch 1 gm 30 bng vi cng sut mi bng l200W, mch 2 gm 24 bng vi cng sut l 200W.

Tng cng sut chiu sng ca mch 1 l 30 . 0,2 = 6 kWTng cng sut chiu sng ca mch 2 l 24 . 0,2 = 4.8 kW

Khi momen ti ca mch chnhM0 = P0 . L0 = (6 + 4.8).16 = 172,8 kWm

Momen ti ca mch nhnh 1M1 = P1 . L1 = 6. 16,4 = 98,4 kWm

Momen ti ca mch nhnh 2M2 = P2 . L2 = 4,8 . 16,4 = 78.72 kWm

Momen quy iMqd = M0 + (M1 + M2 )

Trong , hs c tra trong bng 5.pl.BT ng vi mch 2 pha c trung tnh ly

1

Khi , momen quy i c tnh lMqd = M0+ ( M1+M2)

= 172,8+1,33(98,4+78,72)= 408,37

H s xc nh theo bng 4.5.2[1] ng vimch 2 pha trung tnh = 1,33

Tit din dy dn ca on OA:

0

.

408,371,648%

. 83.2,986

qd

A

cp OA

MF

C U

Trong , gi tr Ucp.OA= UcpU = 3,5 0,514 =2,986%

1,954.1000,514%

380U

H s C = 83 (bng 4.pl.BT), ng vi dy ng mng in 3 pha

Hao tnin p thc t trn on OA:

l1 = 16.4m

O A B

C

l0 = 16m

l2 = 16.4m

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T vn khnh d3h347

408.371,406%

. 83.3,5

qd

OA

cp

MU

C U

Tit din dy dn cc nhnh r:

Trn nhnh AB:

.

98,41,683

. 37.1,58

AB

AB

AB cp AB

MF

C U

mm2

Ta chn dy dn c F = 2,5 mm2

Hao tn in p cho php trn cc nhnh r:

. . 2,986 1,406 1,58%cp AB cp OA OAU U U

H s C = 37 (bng 4.pl.BT), ng vi dy ng mng in 2 pha c dy trung tnh

Trn nhnh AC:

.

78,721,347

. 37.1,58

AC

AC

AC cp AC

MF

C U

mm2 ,

ta chn dy dn c tit din F = 2,5 mm

4,3 Tnh ton ngn mch,

Ngn mch l tnh trng s c nghim trng v thng xuyn xy ra trong h thngcung cp in, Cc s liu tnh ton trong ngn mch l cn c quan trng la chnthit b in, thit k h thng bo v r le,,, V vy vic tnh ton ngn mch l mtphn khng th thiu c trong h thng cung cp ,

Cc dng ngn mch thng xuyn xy ra trong h thng cung cp in l ngnmch N3, N(1,1),N1, Trong ngn mch ba pha l s c nghim trng nht v vythng cn c vo ngn mch ba pha la chn thit b in,

Khi tnh ton ngn mch pha h p ta xem my bin p l ngun (c ni vi hthng v cng ln) v vy in p trn thanh ci cao p ca trm c coi l khng ikhi ngn mch, ta c: IN= I= I, Gi thit ny s lm cho gi tr dng ngn mch tnhton c s ln hn thc t rt nhiu bi vy rt kh gi c in p trn thanh cicao p ca trm bin p phn phi khng thay ikhi xy ra ngn mch sau MBA , Songnu vi dng ngn mch tnh ton ny m cc thit b la chn tho mn c iukin n nh ng v n nh nhit th chng hon ton c th l vic tt trong iukin thc t, gim nh khi lng tnh ton, y ta s ch kim tra vi tuyn cpc kh nng xy ra s c nng n nht , Khi cn thit c th kim tra thm cc tuyn cpcn nghi vn, vic tnh ton cng c tnh ton tng t,

Ta tin hnh xc nh dng ngn mch ti hai v tr c trng l trn thanh ci phnphi v ti mt im xa nht ca mch, n gin ta b qua in tr ca cc thit bph,

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T vn khnh d3h348

Nhm 1,

Ta c s tnh ton ngn mch ca nhm 1 nh sau:

HT O N1 PTi

NM1 NM2 NMi

E Xht ZBA ZOD ZDN1

Xc nh in tr ca cc phn t trong mch ta c:

2 2

30,415,64.10 ( ) 15,64

10,23

cbht

k

UX m

S

Theo tnh ton v la chn trn ta chn 2mybin p cng sut l 180kVA c Po =0,53kW, Pk= 3,15 kW, Uk= 4%, T ta c:

2 23 3

1 2 2

2 23 3

1

2 2 2 2 3 31 1 1

. 3,15.0,4.10 15,6.10

180

. 4.0,4.10 35,6.10

100. 100.180

35,6 15,6 .10 32.10

kBA

BA

kBA

BA

BA BA BA

P UR

S

U UZ

S

X Z R

Do ta chn hai my bin p lm vic song song nn khi ghep hai my bin p lmvic song song th ta c :

31

31

7,8.102

16.102

BABA

BABA

RR

XX

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T vn khnh d3h349

. 1 . 1

. 1 . 1

2 21

2 2

22 . 1 . 1

. 0,06.17 1,02

. 0,194.17 3,298

. 0,061.8 0,488

. 0,26.8 2,08

( )

7,8 (15,64 16) 32.58

) (

OD o OD

OD o OD

D N o D N

D N o D N

k ht BA BA ht BA

k BA OD D N ht BA OD D N

X x L m

R r L m

X x L m

R r L m

Z X Z R X X

m

Z R R R X X X X

2

2 2(7,8 3,298 2,08) (15,64 16 0,488 1,02)

35,59 m

T ta c dng ngn mch 3 pha ti in NM1 l:

3

11 1

4007,08

3. 3.32,58k

k k

E UI kA

Z Z

Ta c : kxk = 1.2 v qxk= 1.09 tra bng 7.pl.BTNh vy dng ngn mch xung kch:

31 12. . 2.1,2.7,08 12xk xk ki k I kA Gi tr hiu dng ca dng in xung kch ti NM1:

3

1 1. 1,09.7,08 7,7xk xk kI q I kA Dng ngn mch 3 pha ti im ngn mch NM2:

322 2

4006,42

3. 3.35,95k

k k

E UI kA

Z Z

Tng t ta c dng xung kch: 32 22. . 2.1,2.6,42 10,8xk xk ki k I kA

Gi tr hiu dng dng xung kch ti NM2: 322

. 1,09.6,42 6,99xk xk kI q I kA

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T vn khnh d3h350

Tnh ton tng t vi cc nhm ta c kt qu nghi trong bng sau:

Bng 4,3

ngdy

Sk

MVA

Xhtm

ro/km

xo/km

L

m

RBAm

XBAm

RO XO

D,N1 10,23 15,64 0,26 0,061 8,0872 7,8 16 1,02 3,298

D,N2 0,37 0,063 5,1027

D,N3 0,52 0,064 17,379

D,N4 0,74 0,066 12,252

D,N5 0,74 0,066 18,0706

ngdy

X

m

R

m

Zk1

m

Zk2m

Ik1kA

Ik2kA

ixk1kA

ixk2kA

D,N1 0,493319 2,10267 32,58 37,07672 7,08 6,22889199 12 10,5691839D,N2 0,32147 1,888 36,849579 6,26728685 10,6343323D,N3 1,112256 9,03708 40,230539 5,74058634 9,7406269

D,N4 0,808632 9,06648 39,971838 5,77773981 9,80366892

D,N5 1,19266 13,3722 42,40189 5,44661767 9,24182087

T bng trn ta s ly kt qu tnh ton ngn mch mt nhm tiu biu l nhm 1

tnh ton v chn thit b bo v v o lng cho phn sau ,

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T vn khnh d3h351

Sau y ta tnh ton cho tng thit b:

ngc

ro/km

xo/km

L

m R

m

X

m

Zki

m

Iki

kA

ixkikA

N1-1 1,84 0,073 7,86901 14,47898 0,574438 43,4849 5,31096 9,013000

N1-2 1,15 0,068 5,86901 6,749362 0,399093 39,1855 5,89368 10,00190

N1-3 1,84 0,073 3,86901 7,118978 0,282438 39,2573 5,88291 9,983621

N1-4 1,15 0,068 5,690594 6,544183 0,38696 39,0792 5,90972 10,02912

N1-5 0,74 0,066 3,13099 2,316933 0,206645 37,1387 6,21849 10,55313

N1-6 0,52 0,064 6,13099 3,188115 0,392383 37,6444 6,13496 10,41136

N1_7 8 0,09 3,309406 26,47525 0,297847 51,392 4,49383 7,626284

N1-11 1,84 0,073 10,30941 18,96931 0,752587 46,4505 4,97189 8,437572

N2-80,74 0,066 10,13099 7,496933 0,668645 39,4939 5,84766 9,923816N2-9 1,15 0,068 12,13099 13,95064 0,824907 43,0865 5,36008 9,096356

N2-10 8 0,09 10,30941 82,47528 0,927847 100,181 2,30529 3,912208

N2-12 8 0,09 13,30941 106,4753 1,197847 123,037 1,87705 3,185454

N2-13 1,15 0,066 14,30941 16,45582 0,944421 44,7009 5,16649 8,767821

N2-14 1,15 0,066 16,30941 18,75582 1,076421 46,2702 4,99126 8,470451

N3-15 0,74 0,066 7,096941 5,251736 0,468398 45,1754 5,11222 8,675732

N3-16 8 0,09 3,964074 31,71259 0,356767 60,4589 3,8199 6,482581

N3-17 1,15 0,068 2,035926 2,341315 0,138443 43,8214 5,27018 8,943796N3-18 1,15 0,066 4,903059 5,638518 0,323602 45,1932 5,11022 8,672325

N3-19 3,33 0,09 7,035926 23,42963 0,633233 54,9499 4,20286 7,132495

N4-20 0,74 0,066 9,038974 6,688841 0,596572 45,7438 5,0487 8,567927

N4-21 3,33 0,09 11,46681 38,18448 1,032013 65,5133 3,52519 5,982443

N4-22 5 0,09 5,466814 27,33407 0,492013 57,2498 4,03402 6,845963

N4-23 0,74 0,066 10,03897 7,428838 0,662572 46,1094 5,00867 8,499994

N4-24 5 0,09 5,533186 27,66593 0,497987 57,482 4,01772 6,818301

N4-25 3,33 0,09 7,961026 26,51022 0,716492 56,8536 4,06213 6,893662N4-26 1,15 0,066 2,961026 3,40518 0,195428 44,1342 5,23283 8,880406

N4-30 3,33 0,09 10,53319 35,07552 0,947987 63,1122 3,65931 6,210046

N5-27 1,15 0,066 7,014542 8,066723 0,46296 50,2692 4,5942 7,796624

N5-28 5 0,09 2,973195 14,86598 0,267588 53,2177 4,33967 7,364658

N5-29 1,15 0,066 7,973195 9,169174 0,526231 50,783 4,54772 7,717741

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T vn khnh d3h352

N5-31 1,15 0,066 10,02681 11,53083 0,661769 51,9456 4,44594 7,545011

N5-32 3,33 0,09 4,985458 16,60158 0,448691 54,2771 4,25496 7,220904

N5-33 2,5 0,74 7,026805 17,56701 5,199836 58,838 3,92513 6,661164

4,4 Chn thit b bo v v o lng ,

Trong qu trnh lm vic, cc thit b in chu nh hng ca nhiu yu t tcng t bn trong ln bn ngoi thit b: Cc yu t bn trong gm: Ch in p, ch nhit, s dao ng in t,,,Cc yu t tc ng bn ngoi gm: Cc iu kin khtng thu vn, a l, t nhin,,, tin cy ca h thng in ph thuc vo trng thica cc thit b v cc phn t ring bit, V vy cc thit b cn c la chn v kimtr cc ch khc nhau chng c th lm vic chc chn v tin cy di s tcng khc nhau ca nhiu yu t, Thng thng cc thit b c la chn theo ch bnh thng v c kim tra theo ch s c, Cng vi cc yu cuv k thut ccthit b phi m bo yu cu v kinh t k thut, xc nh phng n ti u , Tronggii hn ca chng trnh ta ch xt cch la chn cc thit b v tiu k thut,

4,4,1 Chn cp in lc,

Cp in lc t trm bin p n t ng lc ca cc nhm c chn theo hao tnin p cho php nh xc nh mc chn s ni in ti u , Tit din ti thiutheo iu kin n nh nhit ca dy cp c kim tra theo biu thc:

3min 2 .

kk

t

tF I

C

Trong :

tk: l thi gian tn ti ca dng ngn mch, tk=2,5s ( theo bi cho),Ct : l h s ph thuc vo tnh cht cha vt liu dn in, C ttra theo bng y l dy cp li ng nn Ct = 159,

Thay s ta c tit din theo tiu chun iu kin n nh nhit ca cc nhm nhsau :

Nhm 1,

3 2 2min1 22,5

. 6228. 61( ) 70159

kk

t

tF I mm m mm

C

Nh vy cp chn m bo yu cu v n nh nhit,

Tng t vi cc nhm cn liNhm 2: Fmin = 62(mm

2) > 50(mm

2) => khng Tho mn,

Nhm 3:Fmin = 57 (mm2) > 35(mm

2) => khng Tho mn,

Nhm 4:Fmin = 57 (mm2) > 25(mm

2) => khng Tho mn

Nhm 5:Fmin = 54 (mm2) > 25(mm

2) => khng Tho mn,

Chon lai cp cho tat ca la F=70 ta co bang tinh toan sau:

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T vn khnh d3h353

Nhm 2: Fmin = 62(mm2) Tho mn,Nhm 3:Fmin = 59 (mm

2) < 70(mm

2) => Tho mn,

Nhm 4:Fmin = 60 (mm2) < 70(mm

2) => Tho mn

Nhm 5:Fmin = 59 (mm2) < 70(mm

2) => Tho mn,

Nh vy cp c chn u tho mn yu cu v n nh nhit.

Tng t ta kim tra vi nhm thit b:

ngdy

Sk

MVA

Xhtm

ro/km

xo/km

L

m

RBAm

XBAm

RO XO

D,N1 10,23 15,64 0,26 0,061 8,0872 7,8 16 1,02 3,298

D,N2 0,26 0,061 5,1027

D,N3 0,26 0,061 17,379

D,N4 0,26 0,061 12,252

D,N5 0,26 0,061 18,0706

ngdy

X

m

R

m

Zk1

m

Zk2m

Ik1kA

Ik2kA

ixk1kA

ixk2kA

D,N1 0,493319 2,10267 32,58 37,07672 7,08 6,22889199 12 10,5691839D,N2 0,311265 1,3267 36,680597 6,29615924 10,683323D,N3 1,060119 4,51854 38,389858 6,01583054 10,2076613

D,N4 0,747372 3,18552 37,650741 6,13392664 10,4080467

D,N5 1,102307 4,69836 38,492202 5,99983549 10,1805209

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T vn khnh d3h354

ng c

F mm2 Iki Fmin Fhieuchinh ro xo

kA /km /km

N1-1 10 5,31096 52,8136169 70 0,26 0,061

N1-2 16 5,89368 58,6083415 70 0,26 0,061

N1-3 10 5,88291 58,5012417 70 0,26 0,061

N1-4 16 5,90972 58,7678476 70 0,26 0,061

N1-5 25 6,21849 61,8383396 70 0,26 0,061

N1-6 35 6,13496 61,0076948 70 0,26 0,061

N1_7 2,5 4,49383 44,687856 50 0,37 0,62

N1-11 10 4,97189 49,4418134 50 0,37 0,62

N2-8 25 5,84766 58,1507062 70 0,26 0,061

N2-9 16 5,36008 53,3020794 70 0,26 0,061

N2-10 2,5 2,30529 22,9244247 25 0,74 0,066

N2-12 2,5 1,87705 18,6658908 25 0,74 0,066N2-13 16 5,16649 51,3769683 70 0,26 0,061

N2-14 16 4,99126 49,6344339 50 0,37 0,62

N3-15 2,5 5,11222 50,8372928 70 0,26 0,061

N3-16 25 3,8199 37,9861146 50 0,37 0,62

N3-17 16 5,27018 52,4080896 70 0,26 0,061

N3-18 10 5,11022 50,8174042 70 0,26 0,061

N3-19 6 4,20286 41,794372 50 0,37 0,62

N4-20 2,5 5,048750,2056328 70 0,26 0,061

N4-21 6 3,52519 35,0554389 50 0,37 0,62

N4-22 4 4,03402 40,1153815 50 0,37 0,62

N4-23 2,5 5,00867 49,8075637 50 0,37 0,62

N4-24 4 4,01772 39,9532899 50 0,37 0,62

N4-25 6 4,06213 40,3949149 50 0,37 0,62

N4-26 10 5,23283 52,0366711 70 0,26 0,061

N4-30 6 3,65931 36,3891644 50 0,37 0,62

N5-27 10 4,5942 45,6859623 50 0,37 0,62

N5-28 4 4,33967 43,1548475 50 0,37 0,62N5-29 10 4,54772 45,2237527 50 0,37 0,62

N5-31 10 4,44594 44,211625 50 0,37 0,62

N5-32 6 4,25496 42,3124684 50 0,37 0,62

N5-33 2,5 3,92513 39,03255 50 0,37 0,62

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T vn khnh d3h355

Tnh ton ngn mch ta c:

ngc

ro xo L Zki Iki ixki/km /km m m kA kA

N1-1 0,26 0,061 7,86901 37,2924 6,19287 11,7501369

N1-2 0,26 0,061 5,86901 36,9913 6,24327 11,8457736N1-3 0,26 0,061 3,86901 36,6956 6,29359 11,9412536

N1-4 0,26 0,061 5,690594 36,9647 6,24776 11,8542988

N1-5 0,26 0,061 3,13099 36,5878 6,31213 11,9764295

N1-6 0,26 0,061 6,13099 37,0305 6,23667 11,8332533

N1_7 0,37 0,63 3,309406 38,5095 5,99713 11,378762

N1-11 0,37 0,63 10,30941 43,541 5,30413 10,0638708

N2-8 0,26 0,061 10,13099 36,8954 6,2595 11,8765628

N2-90,26 0,061

12,13099 37,2087 6,20679 11,7765653N2-10 0,74 0,066 10,30941 39,1252 5,90276 11,1997027

N2-12 0,74 0,066 13,30941 40,4205 5,7136 10,8408001

N2-13 0,26 0,061 14,30941 37,5556 6,14946 11,6677838

N2-14 0,37 0,63 16,30941 47,1228 4,90096 9,2989231

N3-15 0,26 0,061 7,096941 39,6069 5,83098 11,0635064

N3-16 0,37 0,63 3,964074 41,4172 5,57611 10,5799303

N3-17 0,26 0,061 2,035926 38,8678 5,94186 11,2738928

N3-18 0,26 0,061 4,903059 39,2825 5,87913 11,1548705

N3-19 0,37 0,63 7,035926 43,6213 5,29437 10,0453513N4-20 0,26 0,061 9,038974 38,5612 5,9891 11,3635224

N4-21 0,37 0,63 11,46681 45,4673 5,07941 9,63749898

N4-22 0,37 0,63 5,466814 41,1529 5,61193 10,6478869

N4-23 0,37 0,63 10,03897 44,4393 5,1969 9,86042909

N4-24 0,37 0,63 5,533186 41,2005 5,60544 10,6355731

N4-25 0,37 0,63 7,961026 42,9447 5,37778 10,2036163

N4-26 0,26 0,061 2,961026 37,6581 6,13272 11,6360203

N4-30 0,37 0,63 10,53319 44,7951 5,15563 9,78212562N5-27 0,37 0,63 7,014542 43,8223 5,27007 9,99926065

N5-28 0,37 0,63 2,973195 40,9246 5,64323 10,7072731

N5-29 0,37 0,63 7,973195 44,5108 5,18856 9,84460539

N5-31 0,37 0,63 10,02681 45,9867 5,02203 9,52863714

N5-32 0,37 0,63 4,985458 42,3665 5,45117 10,3428659

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T vn khnh d3h356

N5-33 0,37 0,63 7,026805 43,8311 5,26901 9,99725218

Kim tra li ta c:

ngc

F mm

2

Iki Fmin Fhieuchinh ro xo FminkA /km /km Kim

N1-1 70 6,19287 61,5835675 70 0,26 0,061 61,5835675 Tho

N1-2 70 6,24327 62,0847586 70 0,26 0,061 62,0847586 Tho

N1-3 70 6,29359 62,5851543 70 0,26 0,061 62,5851543 Tho

N1-4 70 6,24776 62,1294084 70 0,26 0,061 62,1294084 Tho

N1-5 70 6,31213 62,769521 70 0,26 0,061 62,769521 Tho

N1-6 70 6,23667 62,0191265 70 0,26 0,061 62,0191265 Tho

N1_7 50 5,99713 59,6370762 70 0,26 0,061 60,24562677 Tho

N1-11 50 5,30413 52,7456975 70 0,26 0,061 58,23613731 Tho

N2-8 70 6,2595 62,2461541 70 0,26 0,061 62,2461541 Tho

N2-9 70 6,20679 61,7219917 70 0,26 0,061 61,7219917 Tho

N2-10 25 5,90276 58,6986355 70 0,26 0,061 61,24536544 Tho

N2-12 25 5,7136 56,8175775 70 0,26 0,061 59,32323656 Tho

N2-13 70 6,14946 61,1518867 70 0,26 0,061 61,1518867 Tho

N2-14 50 4,90096 48,7364664 50 0,37 0,62 48,7364664 Tho

N3-15 70 5,83098 57,9848358 70 0,26 0,061 57,9848358 Tho

N3-16 50 5,57611 55,4503399 70 0,26 0,061 58,64653669 Tho N3-17 70 5,94186 59,0874564 70 0,26 0,061 59,0874564 Tho

N3-18 70 5,87913 58,4636524 70 0,26 0,061 58,4636524 Tho

N3-19 50 5,29437 52,6486414 70 0,26 0,061 57,7523354 Tho

N4-20 70 5,9891 59,5572237 70 0,26 0,061 59,5572237 Tho

N4-21 50 5,07941 50,5110213 70 0,26 0,061 55,97564573 Tho

N4-22 50 5,61193 55,8065436 70 0,26 0,061 58,67575554 Tho

N4-23 50 5,1969 51,6793735 70 0,26 0,061 57,7447711`9 Tho

N4-24 50 5,60544 55,7420053 70 0,26 0,061 59,65471365 Tho N4-25 50 5,37778 53,4780929 70 0,26 0,061 59,56457653 Tho

N4-26 70 6,13272 60,9854197 70 0,26 0,061 60,9854197 Tho

N4-30 50 5,15563 51,2689735 70 0,26 0,061 56,45347644 Tho

N5-27 50 5,27007 52,4069957 70 0,26 0,061 57,56886541 Tho

N5-28 50 5,64323 56,1177992 70 0,26 0,061 61,47338498 Tho

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T vn khnh d3h357

N5-29 50 5,18856 51,5964383 70 0,26 0,061 55,56587555 Tho

N5-31 50 5,02203 49,9404191 50 0,37 0,62 49,9404191 Tho

N5-32 50 5,45117 54,2079029 70 0,26 0,061 58,547648552 Tho

N5-33 50 5,26901 52,3964548 70 0,26 0,061 59,676558224 Tho

4,4,2 Chn thanh ci trm bin p,

Thanh ci l thit b dng tip nhn v phn phi in nng, i vi mng in

cao p thanh ci ngoi tri c th l bng dy mn (cp ng hoc nhm trn nhiusi), cch chn ging nh i vi dy dn bnh thng, Cc thanh ci trong nh vthanh ci h p l loi thanh ci cng (thanh trn hoc hnh ch nht), Thanh ci cchn v kim tra theo cc iu kin sau:

- Tit din thanh ci c chn ph thuc vo mt dng in,- Kim tra theo iu kin n nh nhit,- Kim tra theo iu kin n nh ng, iu kin n nh ng ch kim tra vi

thanhci cng,Sau y ta tin hnh chn thanh ci cho trm bin p:Dng in chy qua thanh ci c xc nh theo biu thc:

241,69 3483. 3.0,4

dlSI AU

D nh chn thanh ci dt bng ng c Jkt = 2,1A/mm2,

T ta c thit din cn thit ca thanh ci l:

2348 1652,1kt

IF mm

j

Nh vy ta chn thanh ci nhm c kch thc l: 50x5=250mm2 ; Chiu di minhp l 125m, khong cch gia cc pha l a = 0,60m,

Kim tra iu kin n nh nhit ta c: 3 2 2min 1

2,5. 7800. 27,231( ) 250

159

ktc k

t

tF I mm mm

C

Kim tra iu kin n nh ng :Nh chn trn ta c khong cch vt ca thanh ci l l = 125cm, khong cch

cc pha l a = 60cm;

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T vn khnh d3h358

Khi m men un l:

2 2 2 2

-8 -81xkl .i 125 .12000M=1,76.10 . =1,76.10 . =66 kG.cm10.a 10.60

M men chng un :W= 0,167.b

2.h = 0,167.0,6

2.5 = 0,23 (cm

3)

T ta c ng sut:

2 2cpM 66

= = =286 kG/cm

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T vn khnh d3h359

4,4,4 Chn aptmat,

Aptmat l mt dng my ct h p n va c chc nng bo v va c chc nngng ct mng in, Aptmat c hai phn t bo v l cun in t v rle nhit , Cunin t dng bo v chng dng ngn mch, cn rle nhit dng bo v chngqu ti, c tnh bo v ca aptmat cng tng t nh c tnh bo v ca cu chy

Dng nh mc ca aptmat phi tho mn iu kin:IkdCN (1,251,5).Imm

Tit din dy dn c la chn pah ph hp vi dng khi ng ca thit b bov theo iu kin sau:

kld.Icp kbv.IkdTrong : Icp : Dng in cho php lu di ca dy dn iu kin lp t bnh

thng,kld : H s tnh n s thay i ca iu kin lp t ,kbv: Bi s dng in cho php, ph thuc vo mng in v iu kinbo v,

1, Chn aptmat cho mng chiu sng:V cng sut chiu sng chung l 10,8 kW nn dng in lm vic ca mch chiu

sng chung l :

cscCS

H

S 12,5= = = 18,992 (A)

3.U 3.0,38I

Tra bng ta chn aptmt loi A503MT c dng nh mc l In = 20A,2,Chnaptmat bo v cho cct ng lc:-Aptmat c dng in ph ti chy qua l : I = 336,16 (A),Ta chn aptmat loi A3144 vi dng in nh mc l In=600 A; Dng khi ng

ca mc bo v Ibv = 300 A; Dng tc ng tc thi l 2100A,- Aptmat nhnh c chn ring cho tng nhm ph ti, da theo dng in

tnh ton ca tng nhm ph tiv tng ph ti:Nhm 1,

Dng in nh mc ca ph ti s 1 trong nhm1 c xc nh theo biu thc:

1119,78

30,13. 3.0,38

SI A

U

bng 2,1 ta tnh ton dng nh mc ca cc ph ti trong phn xng,Nh vy ta c bng sau:

Ph ti S (kVA) In (A)

1 19,7830,08823

2 27,47341,79039

3 19,78 30,088234 27,473 41,79039

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T vn khnh d3h360

5 43,478 66,136296 59,783 90,938557 1,158 1,76148511 15,306 23,28263In 325,8762

Dng in khi ng ca aptmat c xc nh theo biu thc sau: 1

ax

1

nmmM

ap dt n

m

II k I

xc nh ch nng n nht ta coi h s ng thi bng 1, Coi h s m myca ng c l kmm= 4,5 ng c c ch m my nh vi m = 2,5, Xc nh dngm my ca ng c ln nht:

. 4,5.90,94 409,23

409,23325,87 489,56

2,5

mm mm n

ap

I k I A

I A

Ta chn aptmat loi A3144 vi dng in nh mc l In=600 A; Dng khi ngca mc bo v Ibv = 300 A; Dng tc ng tc thi l 2100A,

Tnh ton tng t cho cc nhm ph ti khckt qu c nghi li trong bng sau:

Bng la chn aptmat,

Nhm ph ti 1 2 3 4 5

Imm ,A 409,2235 238,509 263,61 118,908 120,6585

Iap,A 489,5656 270,1586 246,192 153,0042 152,9574

Loi aptmat A3143 A3143 A3143 A3134 A3134

In,ap,A 600 600 600 200 200

Ibv,A 300 300 300 200 200

Ikd,A 2100 2100 2100 1400 1400

3, Chn aptmat bo v ng c,

Tnh ton tiu biu chong c s 1, Dng in lm vic trn dy dn t t nglc n ng c l 19,78A xc nh bng 2,1,

Coi cc ng c c bi sm my l kmm = 4V ng c khi ng iu kin khing nh nn mm = 2,5, Do dng m my ca ng c l :

Imm = 4.30 = 120A,

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T vn khnh d3h361

Dng khi ng ca phn t nhit ca aptmat nm trong gii hn (c chn gingnh ca cu ch ) :

cpkd

mm

mm I*45,1II

120

48( ) 1,45.73 105,85(A)2,5 k dA I

Icpl dng cho php hiuchnh ca dy dn, do phn chn tit dindy dn choon N1,1 l dy dn loi 3XPLE, Ftc = 10 mm

2nn dng in cho php l 73 A,

Cn c vo kt qu tnh ton ta chn aptmt loi EA103G c Un= 380V, dng nhmc bng 50 (A) < Icp = 73 (A), dng khi ng ca phn t bo v nhit l Ik = 70 (A): Ict = 14 (kA),

Dng khi ng ct nhanh ca cun in t ca aptmt :IkCN = 1,25,Imm = 1,25.120 = 150 (A)

Chn tng t aptmt cho cc ng c cn li, ta c kt qu ghi trong bng sau :

Bng 4,3,2,2, Chn p tmt

ngc Ilv Imm/mm 1,45*Icp Ik In Loi Aptomat

N1-1 30,08823 48,14117 105,85 70 50 EA103G

N1-2 41,79039 66,86462 137,75 94 75 EA103G

N1-3 30,08823 48,14117 105,85 70 50 EA103G

N1-4 41,79039 66,86462 137,75 94 75 EA103G

N1-5 66,13629 105,8181 181,25 119 125 EA103G

N1-6 90,93855 145,5017 217,5 169 160 EA103G

N1_7 1,761485 2,818376 43,5 30 10 AII50-3MT

N1-11 23,28263 37,25221 105,85 70 50 EA103G

N2-8 53,002 84,8032 181,25 119 100 EA103G

N2-9 35,335 56,536 137,75 94 75 EA103G

N2-10 2,279 3,6464 43,5 30 10 AII50-3MT

N2-12 3,519 5,6304 43,5 30 10 AII50-3MT

N2-13 34,109 54,5744 137,75 94 75 EA103G

N2-14 46,511 74,4176 137,75 94 75 EA103G

N3-15 4,478 7,1648 43,5 30 10 AII50-3MTN3-16 58,58 93,728 181,25 119 100 EA103GN3-17 40,27 64,432 137,75 94 75 EA103GN3-18 24,95 39,92 105,85 70 40 EA103G

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T vn khnh d3h362

N3-19 12,47 19,952 73,94 40 20 AII50-3MTN4-20 7,091 11,3456 43,5 40 20 AII50-3MTN4-21 13,928 22,2848 73,94 51 30 AII50-3MTN4-22 11,395 18,232 58 40 20 AII50-3MTN4-23 5,306 8,4896 43,5 30 10 AII50-3MTN4-24 10,853 17,3648 58 40 20 AII50-3MTN4-25 16,516 26,4256 73,94 51 30 AII50-3MTN4-26 26,424 42,2784 105,85 71 50 EA103GN4-30 13,928 22,2848 73,94 30 10 AII50-3MTN5-27 26,424 42,2784 105,85 71 50 EA103G

N5-28 10,055 16,088 58 40 20 AII50-3MT

N5-29 26,813 42,9008 105,85 71 50 EA103G

N5-3118,992

30,3872 105,85 70 40 EA103GN5-32 17,531 28,0496 73,94 51 30 AII50-3MT

N5-33 4,879 7,8 43,5 71 50 EA103G

4,4,5, Chn khi ng t cho cc ng c :Khi ng t gip iu khin cc ng c, trong khi ng t c r le bo v qu

nhit, gip cho ng c khng b qu ti ,Khi ng t cho cc ng c c chn theo dng in lm vic tng t nh i

vi aptmt,Chn mt ng c tiu biu ng c s 1: ng c c dng lm vic l Ilv = 30A

Cn c vo ta chn khi ng t do Nga ch to l IIME-411 c dng nh mc carle nhit l 50 A

Cc ng c cn li chn tong t, kt qu ghi trong bng sau :

Bng 4,3,2,6,1 Chn khi ng t cho cc ng c,

ng c Itt In Loi khi ng t

N1-1 30,08823 40 IIME-411

N1-2 41,79039 50 IIME-411

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T vn khnh d3h363

N1-3 30,08823 40 IIME-411

N1-4 41,79039 50 IIME-411

N1-5 66,13629 80 IIME-511

N1-6 90,93855 100 IIME-611

N1_7 1,761485 5 IIME-211N1-11 23,28263 25 IIME-411

N2-8 53,002 60 IIME-411

N2-9 35,335 40 IIME-411

N2-10 2,279 5 IIME-211

N2-12 3,519 5 IIME-211

N2-13 34,109 40 IIME-411

N2-14 46,511 50 IIME-411

N3-15 4,478 5 IIME-211

N3-16 58,58 60 IIME-411

N3-17 40,27 50 IIME-411

N3-18 24,95 25 IIME-211

N3-19 12,47 16 IIME-211

N4-20 7,091 8 IIME-211

N4-21 13,928 16 IIME-211

N4-2211,395

12,5 IIME-211N4-23 5,306 8 IIME-211

N4-24 10,853 12,5 IIME-211

N4-25 16,516 20 IIME-211

N4-26 26,424 30 IIME-411

N4-30 13,928 16 IIME-211

N5-27 26,42410,055

30 IIME-411

N5-28 12,5 IIME-211

N5-29 26,813 30 IIME-411

N5-31 18,992 20 IIME-211

N5-32 17,531 20 IIME-211

N5-33 4,879 5 IIME-211

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T vn khnh d3h364

Theo bng trn cn dng tt c 1b khi ng t loi IIME-511, 1b khi ng t

loi IIME-611 ,14b khi ng t loi ME 411, v 17b loi ME 211,

4,4,6 Chn my bin dng,My bin dng c la chn theo iu kin sau:- in pnh mc: UnBI Umng,- Dng in nh mc pha s cp ca BI phi ln hn hoc bng dng in lm

vic ln nht ca mng in: InBI Ilv,max,Bin dng cho cng t tng,Cn c vo gi tr dng in chy trn on dy tng I lv = 336,16(A), ta chn my

bin dng loi TKM-0,5 c in p nh mc l 0,5 kV, dng nh mc pha s cp l800A , h s bin dng ki = 800/8 = 100, cp chnh xc 10%, cng sut nh mc phanh th l 5VA, Kim tra ch lm vic ca cng t khi ph ti cc tiu,

Cng t lm vic bnh thng nu dng nh th khi ph ti cc tiu ln hn dng sais 10% (I10% = 0,1,5 = 0,5A ),

Dng in khi ph ti nh nht( bng 25% ph ti tnh ton),Imin = 0,25.336,16 = 84,04(A)

Dng in nh th khi ph ti cc tiu:

min2min84,048

0,84 0,5100i

II A A

k

Vy bin dng lm vic bnh thng khi ph ti cc tiu,- Tng t chn my bin dng cho cc nhm ph ti, Kt qu nghi trong bng sau:

Nhm ph ti Ilv I1,BI I2,min Loimybin dng

1 198,0218 49,50544 0,990109 TKM-0,5

2 110,4868 27,6217 0,920723 TKM-0,5

3 103,2758 25,81895 0,860632 TKM-0,5

4 71,28206 17,82051 0,891026 TKM-0,5

5 70,55275 17,63819 0,881909 TKM-0,5

Nh vy my bin dng c la chn tho mn,

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T vn khnh d3h365

CHNG V : TNH TON CH MNG IN,

Tnh ton mng in bao gm gii tch mng in trong c c mng in kn vxc nh tham s ch nh hao tn in p, hao tn cng sut v in nng ,,,Tronggii hn chng trnh ny chng ta ch xt n cc bi ton xc nh tham s ch trong mng in,

5,1 Xc nh hao tn in p trn ng dy v trong my bin p ,5,1,1 Trn ng dy,

Nh tnh ton trn hao tn in p ca cc ng dy c tnh v nghtrong bng tng kt phng n 1 chng IV- La chn v kim tra thit b trong s ni in,5,1,2 Trong my bin p,

Tn tht in p trong my bin p c xc nh theo biu thc sau:

. .BA BA

BA

P R Q X U V

U

Theo tnh ton v la chn trn ta chn 2my bin p cng sut l 180kVA c Po =0,53kW, Pk= 3,15 kW, Uk= 4%, T ta c:

2 23 3

1 2 2

2 23 3

1

2 2 2 2 3 31 1 1

. 3,15.0,4.10 15,6.10

180

. 4.0,4.10 35,6.10

100. 100.180

35,6 15,6 .10 32.10

kBA

BA

kBA

BA

BA BA BA

P UR

S

U UZ

S

X Z R

Do ta chn hai my bin p lm vic song song nn khi ghep hai my bin p lmvic song song th ta c :

31

31

7,8.102

16.102

BABA

BABA

RR

XX

Thay s vo biu thc trn ta c:

3. . 210,76.7,8 118,18.16

.10 8,840,4

BA BABA

P R Q X U V

U

Vy tn tht in p trong my bin p UBA = 8,84V,

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T vn khnh d3h366

5,2 Xc nh hao tn cng sut,

5,2,1 Hao tn cng sut trn ng dy,

Vi phng n chn ly s liu t bng tng kt phng n 1_Chng IV Lachn v kim tra thit b in trong s ni in ta tnh ton hao tn cng sut trn

tng ng dy nh sau:- Hao tn cng sut tc dng trn on dy -N1 c xc nh theo biu thc:

. 12 2 2 2

. 1 6. 1 02 2

120 50,7. . .0,26.8,08.10 0,247

0,38

D N D N

D N

P QP r l kW

U

- Hao tn cng sut phn khng trn on dy -N1 l:

. 12 2 2 2

. 1 6. 1 02 2

120 50,7. . .0,061.8,08.10 0,057 Ar

0,38

D N D N

D N

P QQ x l kV

U

Tng ton tng t cho cc on ng dy khc kt qu nghi trong bng sau:

ng

dy

Titdin

mm2

ro

/km

xo

/km

L

m

P

kW

Q

kVAr

P

kW

Q

kVAr

O 95 0,194 0,06 0,016 210,76 118,18 0,001255 0,000388

-N1 70 0,26 0,061 8,0872120,03 50,69

0,247205 0,057998

-N2 70 0,26 0,061 5,102767,199 27,996

0,04869 0,011423

-N3 70 0,26 0,061 17,37954,242 40,987

0,144635 0,033934

-N4 70 0,26 0,061 12,252 30,26 35,843 0,048541 0,011389

-N5 70 0,26 0,061 18,070631,39 34,222

0,070166 0,016462

TNG 0,560492 0,131594

5,2,1 Hao tn cng sut trong my bin p,

Hao tn cng sut trong my bin p c xc nh theo biu thc sau:

2 21 1 241

(2. . .( ) ) (2.0,53 .3,15.( ) ) 3,88 W2 2 180

BA o k

nBA

SP P P k

S

Nh vy hao tn cng sut trong my bin p l PBA = 3,88 kW5,3 Xc nh tn tht in nng ,Tn tht in nng trn ng dy:

Ta c tngtn tht in nng trong cc nhm nh sau:

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T vn khnh d3h367

ngc

ro xo

V KW/h 106 106 106/km /km V010

6

N1-1 0,26 0,061 124,88 0,10727182 15,8874798 0,0158875 0,98268197 0,16083

N1-2 0,26 0,061 124,88 0,11112322 22,8591124 0,0228591 0,73292197 0,130965

N1-30,26 0,061 124,88 0,05274307 7,81150594 0,0078115 0,48316197 0,079077

N1-4 0,26 0,061 124,88 0,10774511 22,1642028 0,0221642 0,71064138 0,12698

N1-5 0,26 0,061 124,88 0,09425429 30,5423984 0,0305424 0,39099803 0,088214

N1-6 0,26 0,061 124,88 0,25377918 113,075459 0,1130755 0,76563803 0,226007

N1_7 0,26 0,061 124,88 0,00268302 0,02290074 2,29E-05 0,41327862 0,06098

N1-

110,26 0,061 124,88 0,11084681 12,4634872 0,0124635 1,28743912 0,202360

N2-8 0,26 0,061 124,88 0,23690231 63,6189919 0,063619 1,26515803 0,250229

N2-9 0,26 0,061 124,88 0,18911344 33,8570117 0,033857 1,51491803 0,257307

N2-10

0,26 0,061 124,88 0,01058071 0,11970125 0,0001197 1,28743912 0,190016

N2-

120,26 0,061 124,88 0,02158053 0,36839884 0,0003684 1,66207912 0,245525

N2-

130,26 0,061 124,88 0,22565604 37,2132901 0,0372133 1,78695912 0,300789

N2-

140,37 0,63 98,28 0,64109 112,236051 0,1122361 2,03671912 0,412652

N3-

150,26 0,061 124,88 0,01464337 0,31806348 0,0003181 0,88626599 0,131042

N3-16

0,26 0,061 124,88 0,10047601 30,4062583 0,0304063 0,49503356 0,10342

N3-

170,26 0,061 124,88 0,03547776 7,38129762 0,0073813 0,25424644 0,044882

N3-

180,26 0,061 124,88 0,04649489 6,82008775 0,0068201 0,61229401 0,09713

N3-

190,26 0,061 124,88 0,03336025 2,44671912 0,0024467 0,87864644 0,132047

N4-

200,26 0,061 124,88 0,02273442 1,0159611 0,001016 1,12878707 0,167512

N4-21

0,26 0,061 124,88 0,05665083 4,97255299 0,0049726 1,43197523 0,21618

N4-

220,26 0,061 124,88 0,02209744 1,58686202 0,0015869 0,68269573 0,102284

N4-

230,26 0,061 124,88 0,01948147 0,63171322 0,0006317 1,25366657 0,185547

N4- 0,26 0,061 124,88 0,02196362 1,45686366 0,0014569 0,69098427 0,103377

Ni jU Ni jA Ni jC Ni jV Ni jZ

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T vn khnh d3h368

24

N4-

250,26 0,061 124,88 0,0509077 4,85411958 0,0048541 0,99417293 0,151494

N4-

260,26 0,061 124,88 0,03029474 4,62140119 0,0046214 0,36977293 0,059162

N4-

300,26 0,061 124,88 0,05203836 4,56769105 0,0045677 1,31538477 0,198586

N5-

270,26 0,061 124,88 0,07176692 10,9478987 0,0109479 0,875976 0,140154

N5-

280,26 0,061 124,88 0,01147035 0,67198451 0,000672 0,37129259 0,055437

N5-

290,26 0,061 124,88 0,0820248 12,8131673 0,0128132 0,99569259 0,159677

N5-

310,37 0,63 98,28 0,23945605 11,5051829 0,0115052 1,25214803 0,196197

N5-32 0,26 0,061 124,88 0,03260017 3,42490455 0,0034249 0,622584 0,095256

N5-

330,26 0,061 124,88 0,01523484 0,3738702 0,0003739 0,87750741 0,129806

583,05659 5,201157

max

0,64109

Cc ng dy ti t phn phi:

ngdy

Ro

/km

Xo

/kmV0106

O0,19

4

0,06 153,72 2,013 3574,68 3,574 2,459 3,937

-N10,26 0,061 124,88 0,729973869 708,4891

6050,7084892

1,00992954

0,8574537

-N20,26 0,061 124,88 0,257545301 139,5454

777

0,139545

5

0,637225

18

0,233536

1

-N30,26 0,061 124,88 0,759330906 414,5235

044

0,414523

5

2,170289

52

0,734641

9

DNiU iDNA iDNC iDNV iDNZ

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T vn khnh d3h369

-N40,26 0,061 124,88 0,324162868 139,1197

043

0,139119

7

1,530029

76

0,364799

4

-N50,26 0,061 124,88 0,487380346 201,0943

281

0,201094

3

2,256656

53

0,533951

6

TNG

5177,452

175

6,661381

7

max

0,759330906

Tn tht in nng trong my bin p:

Theo tnh ton chng III_phn 3,1,2_Chn cng sut v s lng my bin p_

Ta c: ABA = 17423,8 kWh

Nh vy tng tn tht in nng trong ton mng in l:

dd BAA=A +A

=(5177,45+583,05)+17423,8

=23184,3 kWh

CHNG VI: TNH CHN T B NNG CAO H S CNG SUT ,

Lng cng sut phn khng m cc thit b in tiu th ph thuc vo c tnh cachng, cc ng c khng ng b, my bin p vv ,

Ch lm vic ca ng c c nh hng rt ln n s tiu th cng sut phnkhng v cng c ngha l nh hng ngi tr ca h s cos, Ch lm vic ttnht l khi h s mang ti bng 1, lc s tiu th cng sut phn khng s c gi trnh nht,

Khi cosca thit b in cng ln, tc l mc tiu th cng sut phn khngcng b, v vy lm cho mc yu cu v Q t li t, n gp phn ci tin ch lm vic ca li, H s cosca cc h tiu th li ph thuc vo ch lm vic cacc ph ti in, Khi h s cos thp s dn n s tng cng sut phn khng, struyn ti cng sut phn khng trong mng in lm gim st cc ch tiu kinh t kthut ca mng in ,

Nh vy ta cn tnh ton chn t b sao h s cng sut cos c nng cao,Cng sut ca thit b b cn thit nng h s cng sut t cos1 ln cos2 c

xc nh theo biu thc:Qb = P(tg1 - tg2) = P,kq, kVAr ;

Vi P l cng sut tc dng ca ph ti, kW,

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T vn khnh d3h371

2 23 3

1 . 32

2 26

2

. . .

54,24 20,98.0,26.17,37.2866.10

0,38

303,16 / n m

sb o D N

N

P QA r L

U

kWh

Lng in nng tit kim c do b cng sut phn khng l :

3 3 414,52 303,16 111,36( )sbA A A kWh S tin tit kim c trong nmsau khi t t b l :

3 3. 111,36.1000 111360C A c (/nm)Trong cl gi thnh tn tht in nng,c=1000/kWh,

Vn u t cho t b : Vb3 = vob3 = 1600.103()

T ta c chi ph quy i :3

3 3. 0,185.1600.10 296000bZ pV ( /nm)S tin tit kim c do t t b hng nm ca nhm ph ti 1 l :

3 3 3 111360 296000 184640TK C Z (/nm)

Tng t tnh ton cho cc nhm ph ti 2,3,4 kt qu nghi trong bng 5,2 :

Bng 5,2

N P

kW

Q

kVAr

Qbn

kVAr

ro

L

m

vob

cua toi

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