Do an Role

n nh my in

LI M U hn hai th k, in nng tr thnh dng nng lng thit yu nht, ph bin nhttrong i sng x hi cng nh hot ng lao ng sn xut ca con ngi. Xut pht ttm quan trng , ti mi quc gia trn th gii, cng nghip in lun l ngnh cngnghip c bn, mi nhn ca nn kinh t quc gia.i vi nc ta, cng nghip in lun c ng v Nh nc xc nh l ngnhcng nghip mang tnh nn tng nht, c nhim v quan trng l phc v v thc y qutrnh cng nghip ho, hin i ho t nc. Vic xy dng cc nh my in c quantm ng mc, vi hng lot cc cng trnh th k: NMT Sn La, NMT Ho Bnh,NMT Yaly, NMN Ph Li 1,2, Ninh Bnh...Trong chin lc pht trin cng nghip in ca nc ta, xut pht t iu kin tnhin ca t nc, thu in chim mt v tr ht sc quan trng, bn cnh pht trinhp l cc nh my nhit in. Vic pht trin cc nh my nhit in l khng th thiu,bi l chng b sung cho thu in trong ma kh, cng nh phc v cc nhu cu thc tcc b khc ca tng a phng, n v.L ngnh cng nghip thuc s hu Nh nc, cng nghip in c nhng thay i toln cng vi qu trnh chuyn i c ch. Bc sang nn kinh t th trng, in nng lsn phm hng ho, sn xut in c coi nh sn xut hng ho.Vi s thay i nhn thc nh vy, vic xy dng cc nh my in khng cn mangtnh bao cp, m cng phi m bo hiu qu kinh t, ti thiu l thu hi vn u t,trnh lng ph hoc u t khng hiu qu.Qua thi gian lm thit k, vi khi lng kin thc c hc tp v c s gip ca cc thy c trong khoa, c bit l s ch dn trc tip v tn tnh ca c Ma ThMai Huyn gip em hon thnh bn thit k ny.Tuy nhin do thi gian v kh nng c hn, nn bn n ny khng trnh khi nhngthiu st. V vy em rt mong c s ng gp kin ca cc thy c.Em xin chn thnh cm n !Sinh vin

Bi Danh Ngc D4H22

Page 1

n nh my in

CHNG 1

CHN MY PHT IN, TNH TON PH TI

V CN BNG CNG SUT

Tnh ton ph ti v cn bng cng sut khi thit k nh my in l mt vic khngth thiu c m bo kinh t trong xy dng v vn hnh.Lng in nng do nh my pht ra phi cn bng vi in nng tiu th ti cc hdng in v in nng tn tht.Trong thc t lng in nng tiu th ti cc h dng in lun thay i. Do vy,ngi ta cn phi bit cc th ph ti, nh c th chn phng n vn hnh hp l,chn s ni in ph hp, m bo tin cy cung cp in v cc ch tiu kinh t kthut.T nhng vn t ra nhim v trc ht cho ngi thit k l phi tin hnh cccng vic : chn my pht in, tnh ton ph ti v cn bng cng sut mt cch hp lnht.

1.1.Chn my pht inTheo nhim v thit k phn in cho nh my nhit in c cng sut 300 MW, gm5 my pht in 3 x 100MW; Um = 10,5kV. Chn my pht in loiTB-55-2 c ccthng s k thut cho trong bng sau:

1.2.Tnh ton ph ti v cn bng cng sutXut pht t th ph ti ngy cc cp in p theo phn trm cng sut tc dngcc i Pmax v h s cng sut cos ca ph ti tng ng, ta xy dng c th phti cc cp in p v ton nh my theo cng sut biu kin theo cc cng thc sau :

P(t)

S (t)

P(%)100P(t )cos

.Pmax (1)

(2)

Trong :P(t) cng sut tc dng ca ph ti ti thi im t.S(t) cng sut biu kin ca ph ti ti thi im t.cos - h s cng sut ca ph ti.

Bi Danh Ngc D4H22

Page 2Loi MFSFmMVAPFmMWcosmUFmkVImKAXdXdXdTB-100-23000117,6510010,50,856,4750,1830,263

n nh my in

1.2.1. th ph ti in p my pht (ph ti a phng)Ph ti in p my pht c Udm=10 kV; PUFmax= 15 MW; cos = 0,85.Theo cc cng thc (1) v (2) ta c bng kt qu sau :

thph ti a phng :

2018161412108642

0

0

5

th ph ti a phng10 15 20

25

30

1.2.2. th ph ti trung pPh ti trung p c Udm= 110 kV; PUTmax= 120 MW; cos = 0,86.Theo cc cng thc (1) v (2) ta c bng kt qu sau :

thph ti trung p :

Bi Danh Ngc D4H22

Page 3t(h)04477111113131717212124PUF(%)6070100909010080PUF(t),MW910,51513,513,51512SUF(t),MVA10,58812,35317,64715,88215,88217,64714,118

t(h)04477111113131717212124PTA(%)7080100909010080PUT(t),MW849612010810812096STA(t),MVA98,824112,94141,18127,06127,06141,18112,94

n nh my in

160140120100806040200

0

5

10

15

20

25

30

th ph ti trung p

1.2.3. th ph ti ton nh myNh my in bao gm 3 t my 100 MW c cos = 0,8 nn :PNM = 3 . 100 = 300 MWSNM = 375 MVATheo cc cng thc (1) v (2) ta c bng kt qu sau :

thph ti ton nh my :

400350300250200150100500

0

5

10

15

20

25

30

th ph ti nh my

Bi Danh Ngc D4H22

Page 4t(h)04477111113131717212124PNM(%)7080100809010080PNM(t),MW210240300240270300240SNM(t),MVA262,5300375300337,5375300

n nh my in

1.2.4. th ph ti t dng ca nh myCng sut t dng ca nh my ti mi thi im trong ngy c tnh theo cng thcsau :

STD (t)

% PNM S (t)100 cosTD

.

Trong :PNM - cng sut tc dng nh mc ca nh my,PNM =300 MWSNM - cng sut biu kin nh mc ca nh my,SNM =375 MVA

-lng in phn trm t dng, = 0,5%

cosTD - h s cng sut ph ti t dng, cosTD = 0,85.Kt qu tnh ton cho di bng sau :

th ph ti t dng canh my:

20181614121086420

0

5

10

15

20

25

30

th ph ti t dng

1.2.5. th cng sut pht v h thngCng sut pht v h thng ti mi thiimc xcnh theo cng thc sau :SVHT(t) = SNM(t) - [SUF(t) +STA(t) +STD(t) ]Da vo cc kt qu tnh ton trc ta tnh c cng sut pht v h thng ca nhmy ti tng thi im trong ngy. Kt qu tnh ton cho trong bng sau:

Bi Danh Ngc D4H22

Page 5t(h)04477111113131717212124SNM(t),MVA262,5300375300337,5375300STD(t),MVA15,3816,518,7516,517,6318,7516,5

. 0,4 0,6. NMS NM

n nh my in

T bng kt qu trn ta c thph ti tng hp :

400

350

300

250

200

150

100

50

0

SP (MVA)

STA (MVA)

SNM (MVA)

STD (MVA)

SHT (MVA)

0

5

10

15

20

25

30

th ph ti tng hp

1.2.6. Nhn xt* Ph ti nh my phn b khng u trn c ba cp in p, gi tr cng sut ln nht vnh nht ca chng l:- Ph ti a phng : SUFmax= 17,647 MVA ; SUFmin= 10,588 MVA- Ph ti trung p : SUTmax= 141,18 MVA ; SUTmin= 98,824 MVA- Ph ti t dng : STDmax= 18,75 MVA ; STDmin= 15,38 MVA- Ph ti pht v h thng: SVHTmax= 197,423 MVA; SVHTmin= 137,708 MVA* Vai tr ca nh my in thit k i vi h thng :Nh my in thit k ngoi vic cung cp in cho cc ph ti cc cp in p v tdng cn pht v h thng mt lng cng sut ng k (ln hn lng d tr cng sutquay ca h thng) nn c nh hng rt ln n n nh ng ca h thng.

Bi Danh Ngc D4H22

Page 6t(h)04477111113131717212124SNM(t),MVA262,5300375300337,5375300SUF(t),MVA10,58812,35317,64715,88215,88217,64714,118SUT(t),MVA98,824112,94141,18127,06127,06141,18112,94STD(t),MVA15,3816,518,7516,517,6318,7516,5SVHT(t),MVA137,708158,207197,423140,558176,928197,423156,442

n nh my in

CHNG 2

XC NH CC PHNG N V CHN MY BIN P

Chn s ni in chnh l mt trong nhng khu quan trng nht trong vic tnhton thit k nh my in. Cc phng n xut phi m bo cung cp in lin tc,tin cy cho cc ph ti, th hin c tnh kh thi v tnh kinh t.2.1. xut cc phng nDa vo kt qu tnh ton chng 1 ta c mt s nhn xt sau:

- Do

S UFmax2.SFdm

17, 6472.125

.100 7, 06% 20%

nn khng cn dng thanh gp in p my pht.

nng cao tnh m bo cung cp in cho ph ti cp in p 110kV ta c th nib my pht + my bin p ba pha 2 dy qun vo thanh gp 110kV.

- Do cc cp in p 220kV v 110kV u c trung tnh ni t trc tip, mt khc hs c li = 0,5 nn ta dng my bin p t ngu va truyn ti cng sut lin lcgia cc cp in p va pht cng sut ln h thng.- Do cng sut pht v h thng ln hn d tr quay ca h thng nn ta phi t tnht hai my bin p ni vi thanh inp 220kV.- Cng sut mt b my pht inmy bin p khng ln hn d tr quay ca h thngnn ta c th dng s b my pht in - my bin p.- Do SUTmax/SUTmin= 375/262,5 MVA v SFm = 125 MVA, cho nn ta c th ghp t 1n 2 b my pht in - my bin p ba pha hai cun dy bn trung p.- Do tm quan trng ca nh my i vi h thng nn cc s ni in ngoi vic mbo cung cp in cho cc ph ti cn phi l cc s n gin, an ton v linh hottrong qu trnh vn hnh sau ny.- S ni in cn phi m bo cc yu cu v k thut cung cp in an ton, lintc cho cc ph ti cc cp in p khc nhau, ng thi khi b s c khng b tch ricc phn c in p khc nhau.Vi cc nhn xt trn ta c cc phng n ni in cho nh my nh sau:

Bi Danh Ngc D4H22

Page 7

n nh my in

2.1.1.Phng n 1

HT

220 kV

110 kV

B1

F1

B2

F2

B3

F3

Nhn xt:Phng n ny c hai b my pht in - my bin p 2 cun dy ni ln thanh gpin p 110kV cung cp in cho ph ti 110kV v mt my pht hai cun dy ni ln

thanh gp 110kV. Hai b my pht in - my bin p t ngu lin lc gia cc cp inp, va lm nhim v pht cng sut ln h thng, va truyn ti cng sut tha hoc

thiu cho pha 110kV

+ u im:Gim c ti a s thit b ni vo thanh gp in p cao nn gi thnh r, c li v

mt kinh t. C hai pha in p cao v in p trung u c trung tnh trc tip ni t

(U 110 kV) nn ta s dng my bin p t ngu lin lc. Mt khc, chng loi my

bin p t nn s d chn la thit b cng nh vn hnh, tin cy cao, cung cp in

m bo.

+ Nhc im:C mt phn cng sut truyn qua hai ln bin p lm tng tn tht cng sut. Nhng

v s trn s dng my bin p t ngu lin lc nn tn tht cng sut tng khng ng

k

Bi Danh Ngc D4H22

Page 8

n nh my in

2.1.2.Phng n 2

HT

220 kV

110 kV

B3

F3

B1

F1

B2

F2

Nhn xt:Phng n 2 khc vi phng n 1 ch ch c mt b my pht in - my bin p 2

cun dy ni ln thanh gp 110 kV. Nh vy pha thanh gp 220 kV c u thm 1 bmy pht in - my bin p 2 cun dy

+ u im:V mt cng sut khc phc c nhc im ca phng n 1, lun lun cung cp

cng sut cho cc ph ti cho d gp phi s c ngng mt trong cc t my. Do ,

tin cy cung cp in c nng cao, ci thin ng k.+ Nhc im:

Chng loi my bin p nhiu gy kh khn trong vn hnh v sa cha.Vn u t my bin p t hn so vi phng n 1.

Bi Danh Ngc D4H22

Page 9

n nh my in

2.1.3.Phng n 3HT

220 kV

110 kV

F1

F2

Sdp

F3

Trong s ny ta dng MBA t ngu lin lc gia in p cao v in p trung,cng sut c th truyn t cao sang trung v ngc li tu thuc vo s bin i cngsut ca li, s thay i cng sut lm vic ca nh my, thay i s h thng inv cc nguyn nhn khc. Cun dy h p ca MBA t ngu c th ni vi li phnphi a phng v cung cp in t dng d tr cho nh my in.+ Nhc im:Nhc im ca phng n ny l s MBA nhiu v c nhiu loi MBA, tn thtcng sut trong cc MBA ln, s mch ni vo thit b cao p ln khng kinh t.S lngv chng loi my bin p nhiu nn khng c li v mt kinh t v gy kh khn trongtnh ton thit k cng nh trong vn hnh, sa cha.+ u im:

-

-

tin cy cung cp in cao.

Khi mt my bin p t ngu gp s c th cc my pht vn lm vic.

Bi Danh Ngc D4H22

Page 10

n nh my in

2.1.4.Phng n 4HT

220 kV

110 kV

F1

Sdp

F2

F3

Phng n 4 ch khc phng n 3 ch ch c b my pht in my bin p 2 cundy ni ln thanh gp 220kV . Nh vy pha 110kV c u thm mt b my pht mybin p 2 cun dy .+ Nhc im:Nhc im ca phng n ny cng ging vi phng n 3 l s MBA nhiu vc nhiu loi MBA, tn tht cng sut trong cc MBA ln, s mch ni vo thit b caop ln khng kinh t.S lng v chng loi my bin p nhiu nn khng c li v mtkinh t v gy kh khn trong tnh ton thit k cng nh trong vn hnh, sa cha.+ u im:

-

-

tin cy cung cp in cao.

Khi mt my bin p t ngu gp s c th cc my pht vn lm vic.

Kt lun :-Hai phng n 1 & 2 u c u im m bo cung cp in cho cc ph ti cc cp

in p v c cu to tng i n gin, d vn hnh.-Phng n 3 ,4 tp trung qu nhiu chng loi my bin p,cu to phc tp gy nhiu

kh khn trong vn hnh v sa cha.

* Do , ta thy hai phng n 1 & 2 c nhiu u im hn, m bo an ton, tin cy, cung cp in n nh, d vn hnh... nn ta chn hai phng n ny so snh

v mt kinh t, k thut, chn ra phng n ti u

Bi Danh Ngc D4H22

Page 11

n nh my in

2.2.Tnh ton chn my bin p cho cc phng n

2.2.1.Phng n 1

HT

220 kV

110 kV

B1

F1

B2

F2

B3

F3

a.Chn my bin pChn my bin p 2 cun dy pha 110kV B3:My bin p 2 cun dy B4, B5c chn theo iu kin:S B3dm SFdm 125 MVADo ta c th chn my bin p B3 c cc thng s k thut:My bin p 3 pha hai dy qun: T-125

Chn my bin p t ngu B1, B2 :My bin p t ngu B1, B2 c chn theo iu kin:

S B 2 dm S B3dm

Vi l h s c li ca my bin p t ngu:

1S Fdm

U C U TU C

220 110220

0,5

Bi Danh Ngc D4H22

Page 12SmMVAin p cundyTn tht , kWUN%Io%SmMVAin p cundyPo ,Vtdn t loiPNC-HUN%Io%SmMVACTHPo ,Vtdn t loiPNC-HC-TC-HT-HIo%SmMVACTHABPNC-HC-TC-HT-HIo%12512110,510012040010,50,5

n nh my in

Do : S B 2dm S B3dm

1 1SFdm 0,5

.125 250 MVA

T kt qu tnh ton trn ta chn my bin p t ngu B1, B2 c thng s k thut :Ta chn my bin p k hiu: ATTH -250

b.Phn b cng sut cho ccmy bin pMy bin p 2 cun dy B3: vn hnh kinh t v thun tin, i vi b my pht in - my bin p 2 cun dyta cho pht ht cng sut t 0 - 24h ln thanh gp, tc l lm vic lin tc vi ph tibng phng. Khi cng sut ti qua my bin p bng :1 18, 75SB3 SFdm .Std max 125 118, 75 MVA3 3My bin p t ngu B1 v B2 :1- Cng sut pha cao p : SC ( B1) SC ( B2) .(SVHT )21- Cng sut pha trung p: ST ( B1) ST ( B2) .(SUT S B3 )2- Cng sut pha h p: SH (B1) S H (B2) SC ( B1) ST ( B1)Kt qu tnh ton phn b cng sut cho cc pha ca my bin p t ngu B1 v B2c cho trong bng sau :

Bi Danh Ngc D4H22

Page 13SmMVAin p cun dyTn tht , kWUN%Io%SmMVAin p cun dyPo ,Vt dnt loiPNC-TUN%Io%SmMVACTHPo ,Vt dnt loiPNC-TC-TC-HT-HIo%SmMVACTHABPNC-TC-TC-HT-HIo%250230121111201455201132200,5

T(h)04477111113131717212124SC(MVA )68,85479,10498,71270,27988,46498,71278,221ST (MVA)-9,963-2,90511,2154,1554,15511,215-2,905SH (MVA)58,89176,199109,92774,43492,619109,92775,316

n nh my in

Du - trc cng sut ca pha trung c ngha l ch chiu truyn ti cng sut t phatrung p sang pha cao p ca my bin p t ngu. Nh vy, my bin p t ngu chlm vic trong ch ti cng sut t h v trung p ln cao p khi ph ti trung p cctiu cn trong cc thi im khc my bin p t ngu u lm vic trong ch ti cngsut t h p ln cao v trung p.

c.Kim tra kh nng qu ti ca my bin pQu ti s c:S c mt my bin p 2 cun dy bn trung p :

HT

220 kV

110 kV

B1

F1

B2

F2

B3

F3

- Phn b cng sut trn cc cun dy MBA t ngu khi xy ra s c:+ Cng sut qua pha trung ca my bin p t ngu:

ST =

12

.(SUT)

+ Cng sut qua cun h ca my bin p t ngu:1 1S H SFdm Std Suf3 2+ Cng sut qua pha cao ca my bin p t ngu:SC SH STKhi cng sut pht ln h thng thiu, v th lng cng sut thiu lSthiu = SVHT (2SC )Vo cc thi im trong ngy do cc ph ti lm vic vi th khng bng phngcho nn lng cng sut qua pha cao trung - h ca cc my bin p t ngu cng thayi.

Bi Danh Ngc D4H22

Page 14

n nh my in

Qua tnh ton ta lp c bng phn phi cng sut truyn ti trn cc pha ca ccmy bin p lin lc ti tng thi im trong ngy nh bng sau:

Trong trng hp ny cc my bin p lin lc lm vic theo ch truyn ti cng sutt pha H ln pha Cao & Trung khi cng sut cun H l ln nht.Do iu kin kim tra l: kqtsc..SmTN SHmaxTrong : kqtsc - h s qu ti s c ca my bin p, kqtsc = 1,4Ta c: kqtsc. .SmTN = 1,4 .0,5.250 = 175 MVA > SHmax = 114,579 MVANh vy cc MBA t ngu tha mn iu kin qu ti s c.Lng cng sut thiu nh hn d tr quay ca h thng (200 MVA) nn my bin pc chn tho mn.

S c hng mt my bin p t ngu:

HT

220 kV

110 kV

B1

F1

- iu kin kim tra s c:

B2

F2

B3

F3

.Kqt .SmTNSUTmax- SBT SmTN

SUT max SB 3 K qt

SmTN =250 (MVA)

141,176 118, 750, 5.1, 4

32, 04 MVA tho mn iu kin

- Xt phn b cng sut trn cc cun dy ca MBA t ngu khi s c:+Cng sut truyn trn pha trung:

Bi Danh Ngc D4H22

Page 15T(h)04477111113131717212124ST(MVA )49,41256,47170,58863,52963,52970,58856,471SH(MVA)114,579113,324109,926111,559111,182109,926112,441SC (MVA)65,16756,85339,33848,02947,65339,33855,971Sthiu(MVA)7,37344,501118,74744,49981,623118,74744,501

n nh my in

ST SUT SBT+Cng sut qua cun h ca my bin p t ngu:1SH SFdm Std Suf3+Cng sut qua pha cao ca my bin p t ngu:SC SH STKhi cng sut pht ln h thng thiu, v th lng cng sut thiu lSthiu = SVHT SC SBTQua tnh ton ta lp c bng phn phi cng sut truyn ti trn cc pha ca ccmy bin p lin lc ti tng thi im trong ngy nh bng sau:

Trong trng hp ny my bin p lin lc lm vic theo ch truyn ti cng sut tH v Trung ln Cao khi cng sut pha cao l ln nht, do iu kin kim tra l:kqtsc. SmTN SCmaxTrong : kqtsc - h s qu ti s c ca my bin p, kqtsc = 1,4Ta c: kqtsc. SmTN= 1,4 .250 = 350 MVA > SCmax = 139,8 MVANh vy cc MBA t ngu tha mn iu kin qu ti s c.Lng cng sut thiu nh hn d tr quay ca h thng (200 MVA) nn my bin pc chn tho mn.

Kt lun : Cc my bin p chn cho phng n 1 hon ton m bo iu kin quti bnh thng v qu ti s c.d.Tnh ton tn tht in nng trong cc my bin pTn tht in nng trong my bin p hai cun dy B3:Do b my pht in - my bin p lm vic vi ph ti bng phng trong sut c nmvi SB3 =118,75 MVA nn tn tht in nng trong mi my bin p hai cun dy ctnh nh sau:2 S B A P0 .T PN . .T S BdmTrong:-P0: Tn tht khng ti ca my bin p, kW-PN : Tn tht ngn mch ca my bin p, kW- SBm : Cng sut nh mc ca my bin p, kVA- T : Thi gian lm vic trong nm,T = 8760 hTa c:

Bi Danh Ngc D4H22

Page 16T(h)04477111113131717212124ST(MVA )-19.926-5.80922.4268.3098.30922.426-5.809SH(MVA)119.873119.500118.750119.500119.123118.750119.500SC (MVA)139.800125.30996.324111.191110.81596.324125.309Sthiu(MVA)-120.8-85.852-17.651-89.383-52.637-17.651-87.617

n nh my in

2 S BAP0 .8760PN . .8760 S BdmThay s ta c:2AB3 =100.8760 +400. .8760 = 4038,36 MWh 100Tn tht in nng trong my bin p t ngu B1, B2 :Tn tht in nng c tnh theo cng thc

ATP0 .8760

Trong :

3652

.S 2P .S 2P .S 2 ).

- SdmTN-P0- SiC,SiT,SiH

: cng sut nh mc ca my bin p t ngu.: tn tht khng ti kW: cng sut ti pha Cao, Trung, H ca my bin p tnguti thi im ti trong ngy

-PN-C,PN-T,PN-H

: tn tht ngn mch trong cun dy in p cao, trung, h camy bin p t ngu:

PNC

1PNCT2

PNC H2

PNT H 1 2

2602

260 260 kW

1PNTPNCT2

PNT H2

2

12

2602

260 260 kW

1PNC HPN H2 2

PNT H 2

PNCT

1 260

2600,5 2

520 780 kW

Ta c:AT =A1 +A2Thnh phn th nht:A1 =P0.8760= 120.8760 =1051200 kWh = 1051,2 MWhThnh phn th hai:

A2A2i

Bi Danh Ngc D4H22

3652

.(PNC .SiCPNT .SiTPN H .SiH ).ti

Page 17 118, 75S dmTN. (PNC iC NT iT N H iH it2 5200,50,5 2PNC H 5200,50,5 22 0,5 2S dmTN2 2 2

n nh my in

Da vo bng phn b cng sut ta tnh c thnh phn th hai nh sau:

Ta c:A2 =A2i = 500,272 MWh

Tn tht in nng trongcc my bin p t ngu l:ATB2,3 = 2.(A1 +A2) = 2.(1051,2 +500,272) = 3102,944 MWhNh vy tn tht in nng trong cc my bin p ca phng n 1 l:A1 =AB3 +ATB1,2 = 4038,36+ 3102,944= 7141,354 MWhe.Tnh dng in cng bc ca cc mcha, Cc mch pha cao p 220kV.Mch ng dy:

Ibt

0,26 kA2. 3.Udm 2 3.220

Icb 2.Ibt 2.0,26 0,52 kAMy bin p lin lc:Pha cao ca my bin p lin lc khi lm vic bnh thng:

Ibt

SCmax3.Udm

98,7123.220

0,26 kA

Dng cng bc c xt trong cc trng hp sau:Khi s c my bin p bn trung:SC 65,1673.Udm 3.220Khi s c my bin p t ngu.

Icb

SC3.Udm

139,83.220

0,37 kA

Mch my bin p ni b MF- MBA hai dy qunSdmF 1253.U dm 3.220Icb 1, 05.Ibt 1, 05.0,33 0,34 kA Icb max(0, 52; 0,171; 0,37; 0, 34) 0, 52 kAb, cc mch pha 110kV.- Dng in lm vic bnh thng

1Ibt .2

STmax3.U dm

141,176 0,37 kA2 3.110

Bi Danh Ngc D4H22

Page 18T(h)04477111113131717212124SC(MVA )68,85479,10498,71270,27988,46498,71278,221ST (MVA)-9,963-2,90511,2154,1554,15511,215-2,905SH (MVA)58,89176,199109,92774,43492,619109,92775,316A2i (MWh)58,36261,3652,4311,0629,2140,55179,68

SVHTmax 197,423Icb 0,171 kAIbt 0,33 kA

n nh my in

- Dng in lm viccng bc:Icb 2.I bt 2.0,37 0, 74 kA Mch ni MBA- MP:

Ibt

SdmF3.U dm

125 0, 66 kA3.110

Icb 1, 05.Ibt 1, 05.0, 66 0, 7 kA My bin p lin lc:Pha trung ca my bin p lin lc khi lm vic bnh thng:ST 11, 2153.U dm 3.110Dng cng bc c xt trong cc trng hp sau:+) Khi s c my bin p bn trung:ST 70,5883.U dm 3.110+)Khi s c my bin p t ngu:

Icb

ST3.U dm

22, 426 0,12 kA3.110

Icb max(0, 74; 0, 7; 0,12; 0,37) 0, 74 kAc, Cc mch pha 10,5kVMch my pht:

Ibt

SdmF3.U dm

125 6,87 kA3.10, 5

Icb 1,05.Ibt 1, 05.6,87 7, 2 kATng hp cc kt qu ta c:

Bi Danh Ngc D4H22

Page 19Cp in p, kV22011010Icb, kA0,52kA0,74kA7,2kA

Ibt 0, 06 kAIcb 0,37 kA

n nh my in

2.2.2. Phng n2

HT

220 kV

110 kV

B3

F3

B1

F1

B2

F2

a.Chn my bin p

Chn my bin p 2 cun dy pha 220kV B3:My bin p 2 cun dy B3 c chn theo iu kin:SB 3dm SFdm 125 MVADo ta c th chn my bin p B3 c cc thng s k thut:

Chn my bin p t ngu B1, B2 :My bin p t ngu B1, B2 c chn theo iu kin:

S B1dm S B 2 dm

1S Fdm

Vi l h s c li ca my bin p t ngu:

U C U TU C

220 110220

0,5

Do : S B1dm S B 2 dm

1 1S Fdm 0, 5

.125 250MVA

T kt qu tnh ton trn ta chn my bin p t ngu B1, B2 c thng s k thut :Chn loi my bin p ATTH c Sm =250 (MVA)

Bi Danh Ngc D4H22

Page 20Sm(MVA)UC(kV)UH(kV)P0(kW)Pn(kW)Un%I0%12524210,5115380110.5

n nh my in

b.Phn b cng sut cho cc my bin pCc b my pht my bin p hai cun dy vn hnh vi ph ti bng phng sut trongnm:

SB3 = SmF -

13

.Stdmax = 125 -

13

.18,75 = 118,75 MVA

Cng sut truyn qua my bin p t ngu:Cng sut truyn qua pha cao:

SC (t)

12

SVHT (t) - S B 3

Cng sut truyn qua pha trung:

ST(t) =

12

.S UT(t)

Cng sut truyn qua cun hSH (t) = ST (t) + SC (t)Sau khi tnh ton ta c bng phn phi cng sut:

c.Kim tra kh nng qu ti ca my bin pMy bin p 2 cun dy B3V cng sut camy bin p B3 c chn ln hn cng sut nh mc ca mypht in. ng thi t 0 - 24h lun cho b my phtin - my binp ny lm vic viph ti bng phng nn i vi my bin p B3 ta khng cn phi kim tra kh nng quti .My bin p lin lc B1 v B2 :Qu ti bnh thng:T bng phn b cng sut cho cc pha ca my binp t ngu ta thy cng sut quacc cun dy ca my binp t ngu u nh hn cng sut tnh ton :Stt =STNm = 0,5.250 = 125 MVAVy trong iu kin lm vic bnh thng cc my bin p t ngu B1, B2 khng bqu ti.

Bi Danh Ngc D4H22

Page 21T(h)04477111113131717212124SC(MVA )9,47919,72939,33710,90429,08939,33718,846ST (MVA)49,41256,47170,58863,52963,52970,58856,471SH (MVA)58,89176,199109,92574,43392,618109,92575,317

UCUTUHP0PN (kW)UN%I0%(kV)(kV)(kV)(kW)C-TC-HT-HC-TC-HT-H23012113.81205201132200.5

n nh my in

Qu ti s c:S c mt b my bin p B3 :

HT

220 kV

110 kV

B3

F3

B1

F1

B2

F2

- Phn b cng sut trn cc cun dy MBA t ngu khi xy ra s c:+ Cng sut qua pha trung ca my bin p t ngu:

ST =

12

.SUT

+ Cng sut qua cun h ca my bin p t ngu:1 1SH SFdm Std Suf3 2+Cng sut qua pha cao ca my bin p t ngu:SC SH STKhi lng cng sut thiu lSthiu= SVHT 2.(SC )Vo cc thi im trong ngy, cc ph ti lm vic vi th khng bng phng nnlng cng sut qua pha cao - trung - h ca cc my bin p t ngu cng thay i.Qua tnh ton ta lp c bng phn phi cng sut truyn ti trn cc pha ca ccmy bin p lin lc ti tng thi im trong ngy nh bng sau:

Bi Danh Ngc D4H22

Page 22T(h)04477111113131717212124ST(MVA )49,41256,47170,58863,52963,52970,58856,471SH(MVA)114,579113,324109,926111,559111,182109,926112,441SC (MVA)65,16756,85339,33848,02947,65339,33855,971Sthiu(MVA)7,37344,501118,74744,49981,623118,74744,501

n nh my in

Trong trng hp ny cc my bin p lin lc lm vic theo ch truyn ti cng sutt pha H ln pha Cao & Trung khi cng sut cun H l ln nht.Do iu kin kim tra l: kqtsc..SmTN SHmaxTrong : kqtsc - h s qu ti s c ca my bin p, kqtsc = 1,4Ta c: kqtsc. .SmTN = 1,4 .0,5.250 = 175 MVA > SHmax = 114,579 MVANh vy cc MBA t ngu tha mn iu kin qu ti s c.Lng cng sut thiu nh hn d tr quay ca h thng (200MVA) nn my bin pc chn tho mn.

S c hng my bin p lin lc

HT

220 kV

110 kV

B3

F3

B1

F1

B2

F2

Xt phn b cng sut trn cc cun dy ca MBA t ngu khi s c:Cng sut truyn trn pha trung:ST SUTCng sut qua cun h ca my bin p t ngu:SC (SVHT S3)Cng sut qua pha cao ca my bin p t ngu:SH SC STKhi lng cng sut thiu lSthiu= SVHT + SC S3Qua tnh ton ta lp c bng phn phi cng sut truyn ti trn cc pha ca cc mybin p lin lc ti tng thi im trong ngy nh bng sau:

Bi Danh Ngc D4H22

Page 23T(h)04477111113131717212124ST(MVA )98,824112,941141,176127,059127,059141,176112,941SC(MVA)18,95839,45778,67321,80858,17878,67337,692SH (MVA)117,782152,398219,849148,867185,237219,849150,633Sthiu(MVA)37,91678,914157,34643,616116,356157,34675,384

n nh my in

Trong trng hp ny cc my bin p lin lc lm vic theo ch truyn ti cng sutt pha H ln pha Cao & Trung khi cng sut cun H l ln nht.Nh vy cc MBA t ngu tha mn iu kin qu ti s c.Lng cng sut thiu nh hn d tr quay ca h thng (200MVA) nn my bin pc chn tho mn.

Kt lun : Ccmy bin p chn cho phng n 2 hon tonm boiu kin qu tibnh thng v qu ti s c.d.Tnh ton tn thtin nng trong cc my bin p- i vi cc my bin p hai cun dy B3Do b my pht in - my bin p lm vic vi ph ti bng phng trong sut c nmvi SB3= 118,75 MVA nn tn tht in nng trong mi my bin p hai cun dy ctnh nh sau:2AP0 .TPN . .T S BdmTrong:-P0: Tn tht khng ti ca my bin p, kW-PN : Tn tht ngn mch ca my bin p, kW- SBm : Cng sut nh mc ca my bin p, kVA- T : Thi gian lm vic trong nm,T = 8760 h

Ta c:

2 S BAP0 .8760PN . .8760 S Bdm

Thay s ta c:2118,75 125Tn tht in nng trong my bin p t ngu B1, B2 :Tn tht in nng c tnh theo cng thc

ATP0 .8760

Trong :

3652

. (PNC .SiC2PNT .SiT2PN H .SiH2 ).ti

- SdmTN-P0- SiC,SiT,SiH

: cng sut nh mc ca my bin p t ngu.: tn tht khng ti kW: cng sut ti pha Cao, Trung, H ca my bin p tnguti thi im ti trong ngy

-PN-C,PN-T,PN-H

: tn tht ngn mch trong cun dy in p cao, trung, h camy bin p t ngu:

PNC

1PNCT2

PNCHPNT H 1 12 .PNCT .380 190 kW 2 2

Bi Danh Ngc D4H22

Page 24 S BAB3 =115.8760 +390. .87604090,701MWhS dmTN

n nh my in

1PNTPNCT2

PNTHPNCH 1 12

PNH

1PNTHPNC H2

1 0,5. 380 0,5. 380 2 0,5

380 570 kW

Ta c:AT =A1 +A2Thnh phn th nht:A1 =P0.8760=120.8760 =1051200 kWh = 1051,2MWhThnh phn th hai:

A2A2i

3652

.(PNC .SiCPNT .SiTPN H .SiH ).ti

Da vo bng phn b cng sut ta tnh c thnh phn th hai:

Ta c:A2 =A2i = 1304,248 MWhTn tht in nng trongcc my bin p t ngu l:ATB1,2 = 2.(A1 +A2) = 2.(1051,2 + 1304,248) = 4710,896 MWhNh vy tn tht in nng trong cc my bin p ca phng n 2 l:A1 =AB3 +ATB1,2 = 4090,701 + 4710,896 = 8801,597 MWhe.Tnh dng in cng bc ca cc mcha, Cc mch pha cao p 220kV. Mch ng dy:

Ibt

SVHTmax2. 3.Udm

197,4232 3.220

0,26 kA

Icb 2.Ibt 2.0,26 0,52 kA My bin p lin lc:Pha cao ca my bin p lin lc khi lm vic bnh thng:

Ibt

SCmax3.Udm

39,3373.220

0,1 kA

Dng cng bc c xt trong cc trng hp sau:+) Khi s c my bin p:SC 65,1673.Udm 3.220+) Khi s c my bin p t ngu:SC 78,6733.Udm 3.220

Bi Danh Ngc D4H22

Page 25 .PNCT .380 190 kW222PNCT . 2S dmTN2 2 2Icb 0,17 kAIcb 0,206 kA

n nh my in

Mch my bin p ni b MF- MBA haidy qun:S dmF 1253.U dm 3.220Icb 1, 05.Ibt 1, 05.0,33 0,34 kA Icb max(0, 52; 0,17; 0, 206; 0,34) 0,52 kAb, cc mch pha 110kV. Dng in lm vic bnh thng:

1Ibt .2

STmax3.U dm

141,176 0,37 kA2. 3.110

Dng in lm viccng bc:Icb 2.I bt 2.0,37 0, 74 kA Mch ni MBA- MP:

Ibt

SdmF3.U dm

1253.110

0, 66 kA

Icb 1, 05.Ibt 1, 05.0, 66 0, 7 kA

My bin p lin lc:

Pha trung ca my bin p lin lc khi lm vic bnh thng:ST 70,5883.U dm 3.110Dng cng bc c xt trong cc trng hp sau:+) Khi s c my bin p:

Ibt

ST3.U dm

56,818 0,298 kA3.110

+)Khi s c my bin p t ngu:

Ibt

ST3.U dm

48, 667 0,255 kA3.110

Icb max(0, 74; 0, 7; 0,37; 0, 298) 0, 74 kAc,Cc mch pha 10,5kV Mch my pht:

Ibt

SdmF3.U dm

1253.10, 5

6,87 kA

Icb 1,05.Ibt 1, 05.6,87 7, 2 kATng hp cc kt qu ta c:

Bi Danh Ngc D4H22

Page 26Cp in p, kV22011010Dng in, kA0,520,747,2

Ibt 0,33 kAIbt 0,37 kA

n nh my in

CHNG 3

TNH TON DNG IN NGN MCH

I.Tnh ngn mchMc ch ca vic tnh ton ngn mch l chn cc kh c in v dy dn canh my m bo cc ch tiu n nh ng v n nh nhit khi ngn mch.Khi chn s tnh ton dng in ngn mch i vi mi kh c in cnchn 1 ch lm vic nng n nht nhng phi ph hp vi iu kin lm vic thc t.Dng in tnh ton ngn mch chn kh c in l dng ngn mch 3 pha.Ta tnh ton ngn mch trong h n v tng i c bn

Chn

Scb=1000 MVA

Ucb=Utb

1.Phng n 1:Chn cc im ngn mch

Chn im ngn mch N1: chn kh c in pha 220kV c ngun cung cp lnh my in v h thng.Chn im ngn mch N2: chn kh c in pha 110kV c ngun cung cp lnh my in v h thng.Chn im ngn mch N3: chn kh c in cho mch h p ca my bin plin lc coi nh G2 ngh, ngun cung cp l cc my pht in khc v h thng.Chn im ngn mch N4: Khi tnh ton ch k thnh phn do G2 cung cp.im ngn mch N5 chn kh c in cho mch t dng, thc ra c th ly IN5= IN3 + IN4.

220kV

G

My pht in xd" 0,183

B1

N1

N4

G

B2N3

N5

110kVN2

B3

G

X F* X "d.

S cbSFdm

0,183.

1000125

1,464

Bi Danh Ngc D4H22

Page 27

n nh my in

in khng ng dy

in khng h thng

X D*

2 U tb 2 230

.

*

ScbS N

0, 6.

10003000

0, 2

in khng my bin p B3

X B* 3

00100 S Bdm

10,5 1000.100 125

0,84

in khng bin p t nguTa c:+ in khng ca cun cao p

XC =

1200

U U

SSBdm

=

1 1000.(11 32 20)200 250

0, 46

+ in khng cun trung p

XT =

1200

U U

SSBdm

=

1 1000.(11 20 32).200 250

0

+ in khng cun h p:

XH =

1200

U U

SSBdm

=

1 1000(32 20 11).200 250

0,82

Ngn mch ti N1Ta c s thay th tnh ton ngn mch

0,2

0,416

G3

G1

Bi Danh Ngc D4H22

G 2

Page 28. 2 2 0, 416x0 .l Scb 0, 4.110 1000 XX HT HTU N Scb.U NCT NC H NT H cbU NCT NT H NC H cbU NC H NT H NCT cb

n nh my in

Sau khi bin i ta c s tng ng sauXHT=X1+X2=0,616X34=X3//X4=0,23

XG12=(X5+X7)//(X6+X8)=1,142XG3=X9+X10=2,304

S tng ng

X12

X34XG3

XG12

G12

G3

XN1=X34+X11//X13= 0, 23

1,142.2,3041,142 2,304

0, 994

X ttN1 X N1.

SdmScb

0,994.

3751000

0,373

Tra ng cong tnh ton ta cIttN1(0)=2,6IttN1()=2,1

I dm N1

Sdm3.U tb

3753.230

0, 941kA

I cb

Scb3.U cb

1000 2,510kA3.230

I cbX HTI cb 2,510X HT 0, 616I cb 2,510X HT 0, 616

Bi Danh Ngc D4H22

Page 29I N 1(t) IttN 1(t).I dm N 1I N1 (0) IttN 1(0).I dm N 1 2, 6.0,941 5,811kAI N1 () IttN 1().I dm N 1 2,1.0,941 5,34kA

n nh my in

Ngn mch ti N2S tng ng

0,2

0,416

G3

G1

G 2

Sau khi bin i v s dng kt qu tnh ton im ngn mch N1 ta c s tngng sauX12=X1+X2XHT=X12+X34=0,846

Ta c s tng ng

XN2=XG12//XG3=0,764

X ttN 2 X N 2.

SdmScb

0, 764.

3751000

0, 286


Idm N2

Sdm3.Utb

3753.115

1,883kA

Icb

Scb3.Ucb

10003.115

5,02kA

Bi Danh Ngc D4H22

I N 2 (t)

I cbX HT

IttN 2 (t).I dm N 2

Page 30

n nh my in

I N 2 (0)

I cbX HT

5, 02 I ttN 2 (0).I dm N 2 3, 6.1,883 11, 64kA0,846

I cb 5, 02X HT 0,846Ngn mch ti N3

Bin i ta c s tng ng sauXHTa=X12+X3//X4=0,846X57=X5+X7=0,82+1,408=2,284X910=X9+X10=0,84+1,464=2,304X6=0,82

Ta tip tc bn i v c s sauXG13=X57//X910=1,147

Bin i sao-tam gic ta c s tng ng sau

Bi Danh Ngc D4H22

Page 31I N 2 () I ttN 2 ().I dm N 2 2, 25.1,883 9,16kA

n nh my in

X HT X HTa X 6

X HTa .X 6X G13

2, 494

X N 3

X

X HTa

X ttN 3 X N 3.

SdmScb

2,931.

2501000

0, 733


I dm N 3

Sdm3.U tb

2503.10,5

13, 746kA

I cb

Scb3.U cb

1000 54,986kA3.10,5

I cbX HTI cb 54, 986X HT 2, 494I cb 54,986X HT 2, 494Ngn mch ti N4

in khng tnh ton

X tt X F .

SdmFS cb

1,464.

1251000

0,183

tra ng cong tnh ton ta cItt()=2,55

IN4 (0)

1X tt

.

SFdm3.UF

10,183

.

1253.10,5

37,559kA

I N 4 () I tt ().

SdmF3.U F

2, 55.

1253.10,5

17,527kA

Ngn mch ti N5I N 5 (0) I N 3 (0) I N 4 (0) 39, 642 37,559 77, 201kAI N 5 () I N 3 () I N 4 () 41, 01717,527 58,544kAT gi tr dng ngn mch siu qu IN ta tnh c dng ngn mch xung kch ixktheo cng thc sau: ixk kxk . 2.I NVi im ngn mch N1,N2,N3:kxk=1,80N4,N5:kxk=1,91

Bi Danh Ngc D4H22

Page 32 X G13 6 2,931X G13.X 6I N 3 (t) IttN 3 (t ).I dm N 3I N 3 (0) IttN 3 (0).I dm N 3 1, 28.13,746 39,642kAI N 3 () IttN 3 ().I dm N 3 1,38.13,746 41,017kA"

n nh my in

Tnh ton cho tng im ngn mch ta lp c bng kt qu sau

im NMN1N2N3N4N5

I(kA)5,81111,4639,64237,55977,201

I(kA)5,349,1641,01717,52758,544

ixk(kA)14,79229,172100,912101,452208,531

II.Phng n 2:Chn im ngn mch tnh ton sao cho dng ngn mch ln nht c th c, tt ccc ngun pht cng lm vic tng t nh phng n 1.

B3

220kV

B1

N1

B2

110kVN2

N3

N4

N5

G3

G1

G2

S dng kt qu tnh ton ngn mch phng n 1 ta cMy pht in xd" 0,183X F* 1, 464in khng ng dy X D* 0, 416*

in khng my bin p B3

X B* 3

100 SdmB

.

11 1000.100 125

0,88

Bi Danh Ngc D4H22

Page 33in khng h thng X HT 0, 2UN 0 0 Scb

n nh my in

in khng bin p t nguTa c:+ in khng ca cun cao pXC = 0,46+ in khng cun trung pXT = 0+ in khng cun h p:XH = 0,82Ngn mch ti N1

Bin i ta c s sauXHT=X1+X2=0,616XG12=(X3+X5+X7)//(X4+X6+X8)=1,372XG3=X9+X10=2,344

Bin i sao-tam gic ta c s tng ng sau

XN1= XG3//XG12=0,865

X ttN 1 X N1.

SdmScb

0,865.

3751000

0,325


Bi Danh Ngc D4H22

Page 34

n nh my in

I dm N1

Sdm3.U tb

3753.230

0,941kA

I cb

Scb3.U cb

1000 2,510kA3.230

IN1(t)

IcbX HT

IttN1(t).Idm N1

I N1 (0)

I cbX HT

2,510 IttN 1(0).I dm N 1 3,1.0,941 6, 282kA0, 616

I cb 2,510X HT 0,616Ngn mch ti N2

Bin i v s dng kt qu tnh ton ngn mch im N1 ta c s tng ngsauX12=X1+X2=0,616X34=X3//X4=0,23XG12a=(X5+X7)//(X6+X8)=1,142XG3a=X9+X10=2,344

Bi Danh Ngc D4H22

Page 35I N1 () I ttN1 ().I dm N1 2, 2.0,941 5, 435kA

n nh my in

Bin i sao tam gic ta c s tng ng sau:

X G 3 X G 3a X 34

X G 3a .X 34X 12

2,344.0, 23 2,344 0, 23 3, 2970, 616

X HT

X

X G 3a 2,344

Bin i tng ng ta c s sau:

XN2= X G 3 / / X G12 0,861

X ttN 2 X N 2 .

SdmScb

0,861.

3751000

0,323


Idm N2

Sdm3.Utb

3753.115

1,883kA

Icb

Scb3.Ucb

10003.115

5,02kA

I N 2 (t )

I cbX HT

IttN 2 (t ).I dm N 2

I cb 5,02X HT 1,094I cb 5,02X HT 1, 094Ngn mch ti N3

X12=X1+X2=0,616X34=X3//X4=0,23

Bi Danh Ngc D4H22

Page 36 X 12 34 0, 616 0, 23 1.094X 12.X 34 0, 616.0, 23I N 2 (0) I ttN 2 (0).I dm N 2 3,15.1,883 10, 716kAI N 2 () I ttN 2 ().I dm N 2 2,3.1,883 9,115kA

n nh my in

Bin i ta c s tng ng sauXG1=X5+X7=0,82+1,408=2,284XG3=X9+X10=0,84+1,464=2,344X6=0,82

Bin i sao tam gic ta c s tng ng sau

X HTa X 12 X 34

X 12.X 34X G 3

1, 094

X G 3a

X

X12

Bin i ta c s tng ng sauX G13 X G1 / / X G 3a 1, 4

Bin i sao-tam gic ta c s sau

X HT X HTa X 6

X HTa .X 6X G13

2,199

XX HTa

SScb

2501000

0,902


I dm N 3

Sdm3.U tb

2503.10,5

13, 746kA

Bi Danh Ngc D4H22

Page 37 X G 3 34 3, 297X G 3.X 34X N 3 X G13 6 3, 607X G13.X 6X ttN 3 X N 3. dm 3, 607.

n nh my in

Icb

Scb3.Ucb

10003.10,5

54,986kA

I N 3 (t)

I cbX HT

IttN 3 (t ).I dm N 3

I N 3 (0)

I cbX HT

54,986 I ttN 3 (0).I dm N 3 1,1.13,746 40,126kA2,199

I cb 54,986X HT 2,199Ngn mch ti N4

in khng tnh ton

X tt X F .

SdmFS cb

1,464.

1251000

0,183

tra ng cong tnh ton ta cItt()=2,55

I N 4 (0)

1X tt

.

SFdm3.U F

1 125.0,183 3.10,5

37,559kA

I N 4 () I tt ().

SdmF3.U F

2,55.

1253.10, 5

17,527kA

Ngn mch ti N5I N 5 (0) I N 3 (0) I N 4 (0) 40,126 37, 559 77, 685kAI N 5 () I N 3 () I N 4 () 42, 050 17,527 59,577kAT gi tr dng ngn mch siu qu IN ta tnh c dng ngn mch xung kch ixktheo cng thc sau ixk k xk. 2.IN"Vi im ngn mch N1,N2,N3:kxk=1,80N4,N5:kxk=1,91Tnh ton cho tng im ngn mch ta lp c bng kt qu sau

Bi Danh Ngc D4H22

Page 38im NMI(kA)I(kA)ixk(kA)N16,6825,43517,010N210,7169,11527,278N340,12642,05102,144N437,55917,527101,452N577,68559,577209,839

I N 3 () I ttN 3 ().I dm N 3 1, 24.13, 746 42, 050kA

n nh my in

II.Chn my ct cho cc phng n

Chn my ct in.

Chn my ct cho mch inDa vo kt qu tnh ton dng in ngn mch v dng in cng bc nhngphn trc ta chn my ct theo cc iu kin sau:- Loi my ct kh SF6 hoc my ct khng kh.

- in p- Dng in- iu kin ct- iu kin n nh ng- iu kin n nh nhit

: UmMC/Um: ImMC/Im: Icm/I: il/ixk: I 2nhdm .tnhm/BN

Bng thng s my ct cho phng n 1:

Cc my ct chn c dng in nh mc ln hn 1000A nn khng cn kimtra n nh nhit.Bng thng s my ct cho phng n 2:

Cc my ct chn c dng in nh mc ln hn 1000A nn khng cn kim tra ninh nhit.

Bi Danh Ngc D4H22

Page 39imngnmchTnmchinThng s tnh tonLoimyctThng s nh mcimngnmchTnmchinUmkVIcbkAIkAixkkALoimyctUmMCkVImMCkVIcmkAilkAN1Cao2200,525,81114,7923AQ2245450125N2Trung1100,7411,4629,1723AQ1123440100N3H10,57,239,642100,9128FG101212,580225

imngnmchTnmchinThng s tnh tonLoimyctThng s nh mcimngnmchTnmchinUmkVIcbkAIkAixkkALoimyctUmMCkVImMCkVIcmkAilkAN1Cao2200,526,68217,0103AQ2245450125N2Trung1100,7410,71627,2783AQ1123440100N3H10,57,240,126102,1448FG101212,580225

n nh my in

CHNG 4

TNH TON CHN PHNG N TI U

4.1. Chn s ni in chnh cho cc phng nTrong nh my in, cc thit b in v kh c in c ni li vi nhau thnh s in. Yu cu chung ca s ni in l: Lm vic m bo, tin cy, cu to n gin,vn hnh linh hot, kinh t v m bo an ton cho ngi vn hnh.Tnh m bo ca s ph thuc vo vai tr quan trng ca h tiu th in.V d: H tiu th in loi 1 phi c cung cp bng 2 ng dy ly t 2 ngun clp, mi ngun phi cung cp cng sut khi ngun kia ngh lm vic.Tnh linh hot ca s c th hin bi kh nng thch ng vi nhiu trng thi vnhnh khc nhau.Tnh kinh t ca s c gii quyt bng hnh thc ca cc h thng thanh gp, slng kh c in dng cho s . Ngoi ra cch b tr thit b trong s phi m boan ton cho ngi vn hnh.Cn c vo nhim v cung cp in cho ph ti cp in p v vai tr ca nh myang thit k i vi h thng, s ni in ca cc phng n c chn theo s :

- Pha 220kV :Dng s hai h thng thanh gp c my ct lin lc.- Pha 110kV :Dng s hai h thng hai thanh gp c my ct lin lc.- Pha 10kV :Khng dng h thngthanh gp u cc my pht.

4.2. Tnh ton kinh t ca cc phng n

4.2.1. Phng n 1a. S ni in chi tit

Bi Danh Ngc D4H22

Page 40

n nh my in

TG1

TG2

220 kV

MCLL

110 kV

MCLL

F1

F2

F3

b. Chn my ctMy ct in dng ng ct mch in vi dng ph ti khi lm vic bnh thngv dng ngn mch khi s c. V vy my ct in c chn theo iu kin sau:- in p nh mc ca my ct: Um Um mng- Dng in nh mc ca my ct: Im Icb- Dng in ct nh mc ca my ct: Ict m ITrong :Icb l dng cng bc ca mch t my ct.I l dng ngn mch siu qu thnh phn chu k.Ngoi ra my ct c chn phi kim tra iu kinn nh ng v n nh nhit khingn mch:- Kim tra iu kin n nh ng:im ixk(ixk l dng xung kch khi ngn mch)- Kim tra iu kin n nh nhit:I2nhm. tnhm BN (BN l xung lng nhit ca dng ngn mch)i vi cc my ct c Im 1000A th khng cn kim tra n nh nhit. Cc my ct cng cp in p c chn cng chng loi,cn c vo kt qu tnh dng cng bcv dng ngn mch ta tin hnh chn my ct cho phng n 1 nh bng sau:

c.Tnh vn u tVnu t ca mt phng nc tnh nh sau : V = VB + VTBPPVn u t my bin p :VB = kB . vB

Bi Danh Ngc D4H22


n nh my in

Trong :- kB l h s xt n vic vn chuyn v lp rp my bin p.- vB l gi tin mua my bin p. phng n ny ta s dng :- My bin p t ngu c cng sut 250 MVA, cp in p cao 220kV c githnh: VB = 10.109 ng; KB = 1,3.

- My bin p hai cun dy c cng sut 125MVA, cp in p 110kV c V B110 =

6,08.109 ng; K 110 = 1,5.Vy tng vn u t mua my binp ca phng n1 l :VB1 = 2.1,3. 10.109 + 1,5. 6,08.109 = 35,12.109 ngVn u t mua thit b phn phi :VTBPP = n1vTBPP1 + n2vTBPP2 +......+ nnvTBPPn- n1, n2, ..., nn l s mch ca thit b phn phi ng vi cp in p U1, U2, ..., Un- vTBPP1, vTBPP2,......, vTBPPn l gi tin ca thit b phn phi ng vi cp in p U1,U2, ..., UnT s ni in ca phng n 1 ta nhn thy :- Cp in p 220 kV gm 8 mch my ct SF6 loi gi:286.107 8 = 22,88.109 ng- Cp in p 110 kV gm 8 mch my ct SF6 gi :124.107 8 = 9,92.109 ngVy tng vn u t cho thit b phn phi(ch yu l my ct) ca phng n 2 l:VTBPP =(22,88 + 9,92) .109 = 32,8.109 ngTng vn u t cho phng n 1 l :V1 = VB + VTBPP = ( 35,12 + 32,8 ) . 109 = 67,92.109 ngd.Tnh ph tn vn hnh hng nm

Ph tn vn hnh hng nm ca mi phng nc xcnh theo cng thc sau := PK + Pt + PpTrong :

P

- PK l khu hao hng nm v vn u t v sa cha ln

PK

a . V100

(a : h s khu hao , %)

PK1

6, 4 . 67,92 . 109100

4,35 . 109 ng

- Pt l chi ph tn tht in nng hng nm (ch yu trong my bin p)Pt .A ( : gi tin 1 kWh tn tht = 500 /kWh)

Bi Danh Ngc D4H22

Page 42B

n nh my in

Pt1 500 . 7141354 3,57 . 109 ng

- PP l tin lng cng nhn ( thng nh nn b qua )Vy ph tn vn hnh hng nm ca phng n1 l:P1 = 4,35 . 109 + 3,57 . 109 = 7,92.109 ngf.Chi ph tnh tonChi ph tnh ton ca phng n1 : Z2 = am . V1 + P1Trong : am l h s nh mc ca hiu qu kinh t (am = 0,15)Z1 = 0,15 . 67,92 . 109 + 7,92 . 109 = 18,1 . 109 ng

4.2.2. Phng n 2a.S ni in chi tit

TG1

TG2

220 kV

MCLL

110 kV

MCLL

F3

F1

F2

b.Chn my ctTng t nh phng n 1 kt qu chn my ctin cho phng n 2 nh bng sau :

c.Tnh vn u tVn u t ca mt phng nc tnh nh sau : V = VB + VTBPPVn u t my bin p :VB = kB . vBTrong :

Bi Danh Ngc D4H22


n nh my in

- kB l h s xt n vic vn chuyn v lp rp my bin p.- vB l gi tin mua my bin p. phng n ny ta s dng :- My bin p t ngu c cng sut 250 MVA, cp in p cao 220kV c githnh: VB = 10.109 ng; KB = 1,3.- My bin p hai cun dy c cng sut 125 MVA, c cp in p 220 kV c9

Vy tin u t my bin p phng n 2 l:VB2 = 2.1,3.10.109 +1.1,3.7,4.109 =35,62.109 ngVn u t mua thit b phn phi :VTBPP = n1vTBPP1 + n2vTBPP2 +......+ nnvTBPPn-n1, n2, ..., nn l s mch ca thit b phn phi ng vi cp in p U1, U2, ..., Un- vTBPP1, vTBPP2,......, vTBPPn l gi tin ca thit b phn phi ng vi cp in p U1,U2, ..., UnT s ni in ca phng n 2 ta nhn thy :- Cp in p 220 kV gm 9 mch my ct SF6 loi gi:286.107 9 = 25,74.109 ng- Cp in p 110 kV gm 7 mch my ct SF6 gi :124.107 7 = 8,68.109 ngVy tng vn u t cho thit b phn phi(ch yu l my ct) ca phng n 2 l:VTBPP =(25,74 + 8,68) .109 = 34,42.109 ngTng vn u t cho phng n 2 l :V1 = VB + VTBPP = ( 35,12 + 34,42 ) . 109 = 69,54.109 ng

d.Tnh ph tn vn hnh hng nm

Ph tn vn hnh hng nm ca mi phng n c xc nh theo cng thc sau := PK + Pt + PpTrong :

P

- PK l khu hao hng nm v vn u t v sa cha ln

PK

a . V100

(a : h s khu hao , %)

PK 2

6, 4 . 69,54 . 109100

4, 46 . 109 ng

- Pt l chi ph tn tht in nng hng nm (ch yu trong my bin p)Pt .A ( : gi tin 1 kWh tn tht = 500 /kWh)

Bi Danh Ngc D4H22

Page 44VB220 = 7,4.10 ng; K B220 = 1,3.

n nh my in

Pt 2 500 . 8801597 4, 4. 109 ng

- PP l tin lng cng nhn ( thng nh nn b qua )Vy ph tn vn hnh hng nm ca phng n2 l:P2 = 4,46 . 109 + 4,4 . 109 = 8,86 .109 ngf.Chi ph tnh tonChi ph tnh ton ca phng n2 : Z2 = am . V2 + P2Trong :am l h s nh mc ca hiu qu kinh t (am= 0,15)Z2 = 0,15 . 69,54. 109 + 8,86. 109 = 19,3 . 109 ng

4.3.La chn phng n ti uBng tng kt so snh hai phng n:

Ta thy phng n 1 c tng vn u t thp, chi ph vn hnh hng nm thp v hmchi ph hng nm nh hn so vi phng n 2. V vy chn phng n ti u lm phngn thit k nh my nhit in.

Bi Danh Ngc D4H22

Page 45Cc ch tiuPhng nVn u t9V.10 Ph tn vn hnh9P.10 Chi ph tnh ton9Z.10 167,927,9218,1269,548,8619,3

n nh my in

CHNG 5

CHN KH C IN V DY DN

Trong qu trnh lm vic kh c in v dy dn thng b pht nng. Nguyn nhn chyu l do:

- Tc dng nhit ca dng ph ti lu di.- Tc dng nhit v lc ng in ca dng ngn mch.Nu nhit tng qu cao c th lm cho chng b h hng, nht l nhng ch tipxc hoc lm gim tui th cch in ca chng. V vy i vi kh c in v dy dncn phi quy nh nhit cho php. ng thi khi chn chng cn phi tnh ton saocho trong qu trnh vn hnh ch bnh thng cng nh khi s c xy ra, chng phim bo n nh ng v n nh nhit.Trong nh my nhit in cc thit b chnh nh my bin p, my pht in, my bcng vi cc kh c in nh my ct, dao cch ly... c ni vi nhau bng thanh dn,thanh gp v cp in lc. Thanh dn c hai loi chnh l thanh dn mm v thanh dncng:

- Thanh dn mm c dng lm thanh gp cho cc ph ti cc cp in p 220kV

v 110kV. Chng thng dng dy nhm li thp.

- Thanh dn cng c th bng ng hoc nhm v c dng ni t u cc my

pht in n gian my v dng lm thanh gp in p my pht.

5.1.Chn my ct in v dao cch ly5.1.1.Chn my ct inMy ctindng ng ct mch in vi dng ph ti khi lm vic bnh thng vdng ngn mch khi s c. V vy my ct in c chn theo iu kin sau :

- in p nh mc ca my ct : Um Um mng- Dng in nh mc ca my ct : Im Icb- Dng in ct nh mc ca my ct : Ict m ITrong :Icb l dng cng bc ca mch t my ct.

Ngoi ra my ct c chn phi kim tra iu kinn nh ng v n nh nhit khingn mch:- Kim tra iu kin n nh ng :im ixk ( ixk l dng xung kch khi ngn mch )- Kim tra iu kin n nh nhit :

Bi Danh Ngc D4H22

Page 46I l dng ngn mch siu qu thnh phn chu k.

n nh my in

I2nhm. tnhm BN (BN l xung lng nhit ca dng ngn mch )i vi cc my ct c Im 1000A th khng cn kim tra n nh nhit. Cc my ct cng cp in p c chn cng chng loi. Cn c vo kt qu tnh dng cng bcv dng ngn mch ta tin hnh chn my ct nh bng sau :

5.1.2.Chn dao cch lyDao cch ly dng ngt mch vi dng khng ti. Chng c chn theo cc iukin sau :

- in p nh mc ca dao cch ly : Um Um mng- Dng in nh mc ca dao cch ly : Im Icb- iu kin kim tra n nh ng :im ixk ( ixk l dng xung kch khi ngn mch )- iu kin kim tra n nh nhit :I2nhm. tnhm BN (BN l xung lng nhit ca dng ngn mch )i vi cc dao cch ly c Im 1000A th khng cn kim tra n nh nhit. Cc daocch ly cng cp in p c chn cng chng loi. Cn c vo kt qu tnh dngcng bc v dng ngn mch ta tin hnh chn dao cch ly nh bng sau :

5.2.Chn thanh dn cng cho mch my pht in5.2.1.Chn tit din thanh dn cng cho mch my phtThanh dn cng c chn theo iu kin pht nng lu di cho php :Icp Icb

Bi Danh Ngc D4H22

Page 47imngnmchTnmchinThng s tnh tonLoi daocch lyThng s nh mcimngnmchTnmchinUmkVIcbkAIkAixkkALoi daocch lyUmMCkVImLCkVilkAInh/tnhkA/sN1Cao2200,525,81114,792SGC-245/1250245125080125N2Trung1100,7411,4629,172SQCPT-123/1250123125080100N3H10,57,239,642100,9128BK411212,580225

imngnmchTnmchinThng s tnh tonLoimyctThng s nh mcimngnmchTnmchinUmkVIcbkAIkAixkkALoimyctUmMCkVImMCkVIcmkAilkAN1Cao2200,525,81114,7923AQ2245450125N2Trung1100,7411,4629,1723AQ1123440100N3H10,57,239,642100,9128FG101212,580225

n nh my in

Trong : - Icp : dng cho php lm vic lu di hiu chnh theo nhit ni tthanh dn .

I cp' k hc .I cp

cp 0 cp oqd

. I cp

Vi:cp = 700C : nhit cho php lm vic lu di ca thanh dn0= 350C : nhit mi trng ni t thanh dn0qd = 250C : nhit quy nh khi tnh Icp

I cp'

70 3570 25

. I cp 0,882. I cp

- Icb : dng in lm vic cng bc qua thanh dn ( Icb = 3,969 kA )

Ta c : 0,882 Icp 3,969

Icp 4,5 kA

Vy ta chn thanh dn bng mng ng gim hiu ng mt ngoi v hiu ng gnng thi tng kh nng lm mt. Thanh dn chn c cc thng s k thut nh sau :

5.2.2.Kim tra n nh nhitV thanh dn chn c Icp = 5,5kA > 1kA nn khng cn kim tra n nh nhit.5.2.3.Kim tra n nh ngMt ct ca thanh dn :

Bi Danh Ngc D4H22

Page 48Icp,kAKch thc(mm)Titin1 cc2( mm )M men tr khng3( cm )M men qun tnh4( cm )Icp,kAKch thc(mm)Titin1 cc2( mm )Mt thanhHaithanhWy 0 y 0Mt thanhHaithanhJ y0 y05,5hbcrTitin1 cc2( mm )Wx xWy yHaithanhWy 0 y 0JxxJ y yHaithanhJ y0 y05,5125556,5101370509,5100290,336,7625

n nh my in

Theo tiu chun bn c, ng sut ca vt liu thanh dn khng c ln hn ng sutcho php ca n, ngha l :ttcpi ving ng sut cho php lcp = 1400 kG/cm2i vi thanh dn gpng sut trong vt liu thanh dn gm hai thnh phn: ng sut dolc tcng gia cc pha gy ra (1) vng sut do lc tng tc gia cc thanh dntrong cng mt pha gy ra (2).Do ng sut tnh ton :tt =1 +2Xc nh ng sut1:laixk : dng in xung kch ; ixk = 79,646 kAl : di mt nhp ; l = 120 cma : khong cch gia cc pha ; a = 60 cm

2

12060

. 79, 6462 223, 291 kG

Do s nhp ln hn 3 nn mmen un l :

M

2679, 488 kGcm10 10

ng sut tnh ton: 1

MWy 0 y 0

2679, 488100

26, 795 kG / cm2

So snh vicp ta thy:1 = 26,795 kG/cm2 Smin = 71,723 mm2Vy dy dn chn tho mn iu kin n nh nhit.

b.Kim tra iu kin pht sinh vng quangiu kin kim tra : Uvq UmmngTrong : Uvq l in p ti hn pht sinh vng quangNu dy dn 3 pha c b tr trn ba nh ca tam gic u th ta c :

U vq 84 m r lg

ar

Trong : m l h s xt n x x ca b mt dy dn; m = 0,85r l bn knh ngoi ca dy dn; r = 1,2 cma l khong cch gia cc trc dy dn; a = 5 m = 500 cmThay vo cng thc trn ta c:

U vq 84. 0,85.1, 2.lg

5001, 2

224, 463 kV

Do cc thanh gp 220 kV c b tr trn mt phng nm ngang cho nn Uvq ca phagia gim i 4% cn Uvq ca pha bn tng ln 6% nn ta ch cn xt Uvq ca pha gia. Tac :Uvq(pha gia)= 224,463 . 0,96 = 215,484 kV < Ummng = 220 kVNh vy thanh dn chn khng tho mniu kin vng quang .Do ta chn li thanh dn c tit din ln hn, c cc thng s k thut:

Bi Danh Ngc D4H22

Page 53Tit dinchun2Tit din, mmng knh, mmIcp, ATit dinchunNhmThpDy dnLi thpIcp, A400/223942226,66835

BNKCK I CK 0 .Ta2

n nh my in

Khi : U vq 0,96.84. 0,85. 1,33.lg

5001,33

234,757 kV >Ummng = 220 kV

Vy thanh dn chn tho mn iu kin vng quang .5.4.2.Chn thanh dn mm lm thanh gp cp in p 110kVDng cng bc trn thanh gp 110 kV l : Icb = 0,74 kATheo iu kin chn dy dn mm : Icp Icbhay khc . IcpIcb

I cp

I cbkhc

0, 74 0,84 kA0,882

Do ta chn thanh gp mm loi ACO-500/64 c Icp=945 (A)a.Kim tra n nh nhit khi ngn mchTnh BNCK :c xcnh theo phng php gii tch th: BNCK I tbi2 .tiTheo kt qu tnh ton chng 3, khi ngn mch ti N2 ta c:+) XttNM = 0,268 ti thi im t = 0sIN2=11,46 kA* Tnh ton tng t ta c:Bng kt qu:

2

tb1 =

2 2

2

2

2

133,807 kA2

I2tb2=

I2tb3=

2

2

2

2

11, 6742 11, 2972211, 2972 10, 73222

131,952kA2

121, 399kA2

I

2

tb4

=

I 0,52 I122

10, 7322 10, 45022

112,189kA2

Vit = 0,1; 0,1; 0,3; 0,5.T ta c:BN-CK=0,1.133,807 + 0,1.131,952 + 0,3.121,399 + 0,5.112,189 = 119,09 kA2.s

Tnh BNKCK :V tct = 1s (tng i ln) nn BNKCK c tnh theo biu thc :2

Trong : Ta l hng s thi gian tng ng ca li in. Vi li cao p th ta lyTa = 0,05s.ICK0 = IN2(0) = 11,46 kA

Bi Danh Ngc D4H22

Page 54Thi gian, s00,10,20,51IN2, kA11,4611,67411,29710,73210,450

II0 0,1+I11,46 +11,647 2I 0,1 0,22 II 0,2 0,52 IBNKCK I CK 0 .Ta

n nh my in

BNKCK I CK 0.Ta (11, 46.103 )2 .0, 05 6,537.106 A2sVy xung lng nhit ca dng ngn mch trn thanh gp 110 kV l :BN = BNCK + BNKCK = 119,09. 106 + 6,537. 106 = 125,627 . 106A2s m bo n nh nhit th dy dn chn c tit din nh nht l :

Smin

BNC

125, 627 . 10679

141,88 mm2

Ta thy Schn = 500 mm2> Smin = 141,88 mm2Vy dy dn chn tho mn iu kin n nh nhit.b.Kim tra iu kin pht sinh vng quangiu kin kim tra : Uvq UmmngTrong : Uvq l in p ti hn pht sinh vng quangNu dy dn 3 pha c b tr trn ba nh ca tam gic u th ta c :

U vq 84 m r lg

ar

Trong : m - h s xt n x x ca b mt dy dn; m = 0,85r - bn knh ngoi ca dy dn; r = 1,2 cma - khong cch gia cc trc dy dn; a = 5 m = 500 cmThay vo cng thc trn ta c:

U vq 84. 0,85.1, 2.lg

5001, 2

224, 463 kV

Do cc thanh gp 110 kV c b tr trn mt phng nm ngang cho nn Uvq ca phagia gim i 4% cn Uvq ca pha bn tng ln 6% nn ta ch cn xt Uvq ca pha gia. Tac :Uvq(pha gia)= 224,463 . 0,96 = 215,484 kV > Ummng = 110 kVVy thanh dn chn tho mn iu kin vng quang .

5.5.Chn my bin p o lng5.5.1.Chn my bin in p (BU)a.Chn BU cho cp in p my pht 10,5kVBU c chn theo cc iu kin sau :

- Loi bininpc chn da vo v trt, s ni dy v nhim v ca n.

cpin cho cng t ch cn dng 2 BU mt pha u V/V.

- iu kin v in p : UmBU Ummng = 10,5 kV

0,5.

- Cp chnh xc ca BU : v cp in cho cng t nn chn BU c cp chnh xc l

Bi Danh Ngc D4H22

Page 552

n nh my in

- Cng sut nh mc : tng ph ti ni vo BU (S2) phi nh hoc bng cng sut

nh mc ca BU vi cp in p chn :S2SmBU.S ni cc dng c o vo my bin in p v my bin dng in mch my pht :

A

A

A

W

VAr

W

Wh

VArh

abc2xHOM-10

A

B

F

C

V

f

Ta phi phn b cc ng h in pha th cp ng u cho hai BU tng ng nh bngsau :

Tn ng h

K hiu

Ph ti BU pha ABW (P) VAr(Q)

Ph ti BU pha BCW (P) VAr(Q)

Vn kOt kOt k phn khngOt k t ghiTn s kCng t tc dngCng t phn khngTng cng

2 341 342/1 33 340 670 672-

7,21,81,88,3-0,660,6620,42

-----1,621,623,24

-1,81,88,36,50,660,6619,72

-----1,621,623,24

Bin in p pha AB c : `

S 2

20,42 2 3,24 2 20,675 VA

cos

20,4220,675

0,988

Bin in p pha BC c :

Bi Danh Ngc D4H22

Page 56

n nh my in

S 2

19,72 2 3,24 2 19,984 VA

cos

19,7219,984

0,987

Ta chn BU cho cp in p 10,5 kV c thng s :

Chn dy dn ni gia BU v cc dng c o lng :- Tit din dy dn c chn sao cho tn tht in p trn n khng vt qu 0,5%in p nh mc th cp khi c cng t v 0,3% khi khng c cng t.- m bo bn c: tit din ti thiu ca dy dn l 1,5 mm2 i vi dy ng v2,5 mm2 i vi dy nhm khi khng ni vi dng co in nng. V 2,5 mm2 i vidy ng v 4 mm2 i vi dy nhm khi ni vi dng co in nng.Tnh dng in trong cc dy dn :

I a

I c

S abU abS bcU bc

20, 675100

19,984100

0,207 A

0,2 A

n gin ta coi Ia = Ic = 0,2 A v cosab = cosbc = 1

Nh vy dng in Ib =

3 . Ia =

3 . 0,2 = 0,34 A

in p ging trn dy a v b bng :

U

I a

Ib . r

I a

Ib

. lS

Gi s khong cch t dng c o n BU l l = 50 m, b qua gc lch pha gia Ia vIb . V trong mch c cng t nnU = 0,5% do vy tit din dy dn phi chn l :

S

I a I bU

. . l

0, 34 0, 20,5

. 0,0175 . 50 0,945 mm 2

Theo tiu chun bn c hc ta ly dy dn l dy ng c tit din S = 1,5mm2i vidy dn khng ni vi dng co in nng v c tit din S = 2,5mm2i vi dy dnni vi dng co in nng.b.Chn BU cho cp in p 110kV v 220kV

Bi Danh Ngc D4H22

Page 57Kiu BUCpinp(kV)in p nh mc (V)Cng sut nh mc(VA)Kiu BUCpinp(kV)Cun s cpCun thcpCp 0,5Cp 1HOM 10101050010075150

n nh my in

Ph ti th cp ca BU pha 110kV v 220kV thng l cc cun dy in p ca ccng h Vnmt c tng tr tng i ln nn cng sut thng nh nn khng cn tnhph ti th cp.Nhim v chnh ca cc BU cc cp in p ny l kim tra cch in v o lngin p do vy ta chn ba bin in p mt pha u Y0/Y0.Ta chn cc BU c thng s sau :

5.5.2.Chn my bin dng in (BI)My bin dng in c chn theo cc iu kin sau :

- S ni dy v kiu my : s ni dy tu thuc vo nhim v ca my bin

dng in. Kiu bin dng in ph thuc vo v tr t.

- in p nh mc : UmBI Ummng- Dng in nh mc s cp : ImSC Icb- Cp chnh xc ca BI chn ph hp vi yu cu ca dng c o. Ph ti th cp ca

BI chn tng ng vi cp chnh xc. BI c mt ph ti nh mc l ZmBI. m bo chnh xc yu cu tng ph ti th cp (Z2) ca n k c tng tr dy dn khng cvt qu ZmBI.Z2 = Zdc + ZddZmBITrong : Zdc l tng ph ti ca dng c o.Zdd l tng tr dy dn ni t BI n dng c o.a.Chn bin dng cho cp in p my pht 10,5kVT s ni dy cc dng c o lng vo BI ta xc nh c ph ti th cp ca BI cc pha nh sau

Tn dng c o lng

K hiu

Ph ti th cp (VA)a B c

Am pe mtOt k tc dngOt k t ghi

302 341 33

1510

1

1510

Bi Danh Ngc D4H22

Page 58Loi BUCpinp(kV)in p nh mc cccun dy (V)Cng suttheo cpchnh xc(VA)Cngsutmax(VA)Loi BUCpinp(kV)S cpTh cpCp0,5Cp1Cngsutmax(VA)HK 110 57HK 220 58110220110000/ 3220000/ 3100/ 3100/ 340040060060020002000

n nh my in

- in p nh mc ca BI : UmBI Ummng = 10,5 kV- Dng in nh mc s cp : ImSC Icb = 3,969 kA- Cp chnh xc : 0,5 ( v trong mch th cp c cng t )Vy t cc iu kin trn ta chn BI cho cp in p my pht l loi T10c ccthng s :Um = 10,5 kV ; ImSC = 4000A ; ImTC = 5AVi cp chnh xc 0,5 ta c ZmBI = 1,2

Chn dy dn ni t BI n dng c o:Gi thit khong cch t BI n dng c o l l = 30m. V bin dng mc trn c 3 phann chiu di tnh ton l : ltt = l = 30m.Tng tr cc dng c o lng mc vo pha a ( hoc pha c ) l :

Z dc

S dc2

265 2

1,04

m bo chnh xc th tng ph ti th cp (Z2) k c tng tr dy dn khngc vt qu ZmBI:Z2 = Zdc + ZddZmBI = 1,2 Z dd Z dmBI Z dc 1,2 1,04 0,16

Z dd Rdd

lS

0,16

S

. lRdd

0,0175.300,16

3,28 mm 2

Vy ta chn dy dn bng ng c tit din l S = 4mm2My bin dng chn khng cn phi kim tra n nh ng v n quyt nh bi iukin n nh ng ca thanh dn mch my pht.Ta c ImSC = 4000A >1000A do vy BI chn khng cn kim tra n nh nhit.b.Chn bin dng cho cp in p 110kV v 220kVBI chn theo iu kin :- in p nh mc ca BI : UmBI Ummng- Dng in nh mc s cp : ImSC IcbVi cp in p 110kV ta c Icb = 379 AVi cp in p 220kV ta c Icb = 380 A

Bi Danh Ngc D4H22

Page 59Ot k phn khngCng t tc dngCng t phn khng 324/1 670 67252,52,5552,52,5Tng cng26626

I dmTC

n nh my in

Ta chn BI c thng s nh bng sau :

5.6.Chn cp v khng in cho ph ti a phngTheo nhim v thit k : P22max = 15 MW, costb = 0,85.Gm 4 l kp x 2.5 MW x 4 kmv 2 l n x2,5 MW x 4 km.in p cung cp cho ph ti a phng l 22 kV. Ph ti a phng c ly in tu cc ca hai my pht G1 v G2 qua hai my bin p tng p 10,5/22 kV. Hai pha camy bin p c t my ct in.

Bi Danh Ngc D4H22

Page 60Thng stnh tonLoi BIUmkVBi snnhngBi snnhnhitIm (A)CpchnhxcPhti()im(kA)Um(kV)Icb(A)Loi BIUmkVBi snnhngBi snnhnhitScpThcpCpchnhxcPhti()im(kA)110220379380TH-110MTH220-3T1102201107534,6/360/1400400550,50,51,2214524-48

n nh my in

G1

~

T5

~ G

T6

2

MC

N5

22

MC

N6

22

MC3

N7

5.6.1: Chn my bin p a phng T5 v T6Theo chng I, ph ti a phng cc i l S22max = 17,647 MVA. Cc my bin p T5v T6 c chn theo iu kin :

ST5m = ST6m

S22maxk qt

17,647 12, 61 MVA1,4

Trong kqt = 1,4 l h s ti ca my bin p.T iu kin ny ta chn my bin p c cc thng s :STm = 25 MVA ; UN% = 7 %5.6.2.Chn cp 1Ph ti cp in p Udm = 22kV, Pmax = 15MW, cos = 0,85 bao gm 4 ng dy cpkp 2,5MW 4km ,2 ng dy cp n 2,5MW 4km

Chn tit din cp kp theo mt dngin : S S kt

I lvbtJ kt

Dng in lm vic bnh thng trn ng dy cp kp ca ph ti a phng:

Bi Danh Ngc D4H22

Page 61

n nh my in

24

Ilvbt

P2 3 .U dm cos

2,5 0, 039 kA2 3 . 22.0,85

Tmax

365

P . t0PUF max

i

36515

9 .4 10,5.3 15 .4 13, 5.2 13,5.4 15.4 12.3

7409,5 hTra bng vi cp li ng v Tmax = 7409,5 h ta c Jkt =2A/mm2

Skt

IlvbtJ kt

0, 039 . 1032

Tra bng chn cp ba li bng ng c cch in bng giy tm du nhathng v cht do khng chy, v bng ch, t trong t ( nhit t to = 15oC ) tac :S = 25mm2 ; Um = 22 kV ; Icp = 85 A ;Kim tra cp kp chn theo iu kin pht nng :iu kin : k qtsc .k1.k2.IcpIcb = 2IlvbtTrong : k1 - h s hiu chnh theo nhit , k1 = 0,882.k2 - h s hiu chnh theo s cpt song song, k2 = 0,92.kqtsc - h s qu ti s c.kqtsc = 1,3Thay vo iu kin trn ta c :1,3.0,882.0,92.85 = 89,664 A Icb = 2.39= 78 ANh vy cp kp chn m bo iu kin pht nng cho php.+ Chn cp n

Chn tit din cp n theo mt dngin : S S kt

I lvbtJ kt

Dng in lm vic bnh thng trn ng dy ph tia phng:

Ilvbt

P3 .U dm cos

2,53 . 10.0,85

0, 077 kA

24

Tmax

0PUF max

.

36518

15,3 .7 18.5 13,5 .3 18.5 15, 3.4

7409,5 hTra bng vi cp li ng v Tmax = 7409,5 h ta c Jkt =2 A/mm2

Skt

I lvbtJ kt

0, 077 . 1032

Tra bng chn cp ba li bng ng c cch in bng giy tm du nha

Bi Danh Ngc D4H22

Page 62i 19,3 mm 2365 Pi it 38, 6 mm2

n nh my in

thng v cht do khng chy, v bng ch, t trong t ( nhit t to = 15oC ) tac :S = 50 mm2 ; Um = 22 kV ; Icp = 125 A ;Kim tra cp n chn theo iu kin pht nng :iu kin pht nng bt : k1.k2.IcpIcb = IlvbtTrong : k1 - h s hiu chnh theo nhit, k1 = 0,882.k2 - h s hiu chnh theo s cpt song song, k2 = 0,92.Thay vo iu kin trn ta c :0,882.0,92.125 = 101,43 A < Icb = 77.2=154 ANh vy cp n chn khng m bo iu kin pht nng cho php.Chn li :S = 120mm2 ; Um = 22 kV ; Icp = 210 A ;Thay vo iu kin trn ta c :0,882.0,92.210 = 170,4 A >Icb = 154 ATha mn5.6.3:Chn my ct cho mch ph ti a phng:a.Pha 10,5kV chn phn trnb.pha 22kV: chn my ct cho mch 22 kV, phi xc nh dng in ngn mch khi xy ra ngnmch sau my bin p a phng.. chn my ct MC1 ta phi tnh ton ngn mch ti N5, vi ngun cung cp l h

thng v ton b my pht in ca nh my.

in khng ca tng i ca my bin p T5 :

X T5

.100 ST5dm

7 100.100 31,5

0,22

T s trn, ta c s thay th khi tnh ton ngn mch ti N5 nh hnh v:

Bi Danh Ngc D4H22

Page 63U N % Scb

n nh my in

G2

XG2

HT

X12

G1,3

XT5

N5

Trong

X12 = 0,1947; X14 = 0,5056; XG2 = 0,1555Ghp song song HT, G2 v G1,3,4,5 ta c

Vi

HT,G1,2,3

X1

XT5

N5

X15

X 12 X14X12 X14X12 X14X12 X14

X G2

X G2

0,1947 0,50560,1947 0,50560,1957 0,50560,1947 0,5056

0,1555

0,1555

0,074

Bin i tip s trn ta c s

X16

HT,G1,2,3

Vi

X16 = X15 + XT5 = 0,074 + 0,22 = 0,294Bi Danh Ngc D4H22

N5

Page 64

n nh my in

Sm = SHTm + 3.SNMm = 3000 + 3 118,75 = 3356,25 MVADo ta c

SdmScb

0,294

3356,25100

9,867 > 3

Nn

IN5(0) = IN5( ) =

1 S dmX tt 3.U tb

1 3356,25 8,93 kA9,867 3 22

Dng in ngn mch xung kch

ixk =

2 .Kxk.IN5(0) =

2 .1,8.8,93 = 22,732 kA

Dng in cng bc ca mch h p my bin p T5 v T6

Icb =

S22max3.U 22dm

17,6473 22

0,5 kA

T kt qu tnh ton trn ta chn c my ct mch h p ca cc my bin p aphng T5 v T6 c cc thng s nh bng :

.Chn my ct MC2:Cc my ct ny c chn theo dng in ngn mch ti N6 (ging N5)Theo tnh ton phn chn cp dng lm vic cng bc ca cp l:

Icb = 210 AT cc s liu trn ta chn loi my ct 8BM20 c cc thng s:

5.6.4. Kim tra iu kin ct ca cc my ct v iu kin n nh nhit ca cp.Ti a phng dng my ct MC3 c dng in ct nh mc l:

Bi Danh Ngc D4H22

Page 65Cpin p(kV)Thng s tnh tonLoimy ctThng s my ctCpin p(kV)Icb(kA)I(0)(kA)ixk(kA)Loimy ctUdm(kV)Idm(kA)Icat dm(kA)tct220,2868,9322,7328BM20240,63160,7

Cpin p(kV)Thng s tnh tonLoimy ctThng s my ctCpin p(kV)Icb(kA)I(0)(kA)ixk (kA)Loimy ctUdm(kV)Idm(kV)Icat dm(kA)tct220,58,9322,7328DA10242,5210.7

Xtt = X16

n nh my in

Ict.m.MC3 =20 kA, thi gian ct ca bo v r le l t2 = 0,7 giy. Cp nhm, v PVC vithit din l F=70 m2

m bo ct ngn mch c tnh chn lc th thi gian ct t2 ca my ct MC2 cchn theo nguyn tc bc thang vi t = 0, 7giy, tc l:t1 = t2 + t = 0,7+ 0,7= 1,4 giya. Kim tra iu kin ct ca my ct MC2 v n nh nhit ca cp S1.Khi xy ra ngn mch ti N6 , my ct MC2 phi tho mn iu kin ct v cp S1 phitho mn n nh nhit, tc l:

I "N6 Ict.m.MC2

I"N 6 INS1

Trong INS1 l dng n nh nhit ca cp S1.Tr s ca dng n nh nhit ca cp c xc nh theo cng thc :

I NS

S .Ct

Trong :S : Tit din ca li cp (mm2)C : H s, cp ng c CCu = 141 A2/st : Thi gian ct ngn mch

p dng cng thc trn ta tnh c :

I NS1

S1.CCut1

120.1411

16920 A = 16,92 kA

T cc kt qu tnh ton trn ta thy :IN6 (0) = 8,93 kA < Ict.m.MC2 = 16 kAIN6 (0) = 8,93 kA < INS1 = 16,92Vy cc my ct MC2 v cp S1 tho mn cc iu kin nu trnb. Kim tra iu kin ct ca my ct MC3 v n nh nhit ca cp S2Khi xy ra ngn mch ti N7, my ct MC3 phi tho mn iu kin ct v cp S2 phitho mn iu kin n nh nhit, tc l:

I"N 7 Ict.m.MC3

Bi Danh Ngc D4H22

Page 66

n nh my in

I"N 7 INS2

Ta tin hnh tnh ton ngn mch ti N7. Ta c s thay th ng tr tnh ton ngnmch ti N7 nh hnh:

X16

XS1

N7

HT,G1,2,3

Vi XS1 l in khng ca cp S1, c xc nh nh sau:

X

S1

X 0 .l.

S cbU 2cb

Trong :X0 : in khng n v ca cp, tit din ca cp 70 mm2 th X0 = 0,107 /kml : Chiu di cp, l = 4 km

Ta tnh c :

X S1 0,107 10.

Bin i s ta c

10022 2

0,221

X17

N7

HT,G1,2,3

Vi

X17 = X16 + XS1 = 0,294 + 0,221 = 0,515Sm = SHTm + 5.SNMm = 3000 + 3 118,75 = 3356,25 MVAin khng tnh ton

SdmScb

0,515

3356,25100

17,3 > 3

Khi ta c

IN7(0) = IN7( ) =

Bi Danh Ngc D4H22

1 S dmX tt 3U tb

1 3356,25 5,096 kA17,3 3 22

Page 67Xtt = X17

n nh my in

Dng in ngn mch xung kch

ixk =

2 . Kxk.IN7(0) =

2 . 1,8. 5,096 = 12,972 kA

Dng n nh ca cp S2 l:

I NS 2

S2 .CCut2

50.1410,5

9970 A = 9,97 kA

T cc kt qu tnh ton trn ta thy:

IN7(0) = 5,096 kA < Ict.m.MC2 = 15 kAIN7(0) = 5,096 kA < INS2 = 9,97Vy cc my ct MC3 v cp S2 tho mn cc iu kin nu trn.

5.7. Chn chng st van

5.7.1. Chn chng st van cho thanh gpTrn cc thanh gp 220kV v 110kV t cc chng st van vi nhim v quan trng lchng qu in p truyn t ng dy vo trm. Cc chng st van ny c chn theoin p nh mc ca trm: Um CSV > Um mng

-

-

Trn thanh gp 220kV chn chng st van loi cacbua silic c Udm = 220kV t c 3 pha.

Trn thanh gp 110kV chn chng st van loi 3EP1 c Udm = 110kv t trn c 3

pha.

5.7.2. Chn chng st van cho my bin p*Chng st van cho my bin p t ngu:Cc my bin p t ngu do c s lin h v in gia cao v trung p nn sng inp c th truyn t cao p sang trung p v ngc li. u ra cao p v trung p t ccchng st van:+ Pha cao p chn chng st van loi cacbua silic SiC c Udm = 220 kV t c 3 pha.+ Pha trung p chn loi 3EP1 c Udm = 110kV t c 3 pha.*Chn chng st van cho my bin p 2 cun dy ni b:Trn thanh gp 110kV c t cc chng st van nhng i khi c nhng ng st cbin ln truyn vo trm, cc chng st van y phng in.in p d cn li truyn ti cun dy ca my bin p vn rt ln c th ph hng cchin ca cun dy, c bit l phn cch in gn trung tnh nu trung tnh cch in.V vy ti trung tnh ca my bin p hai cun dy cn b tr mt chng st van.Tuy nhin do in cm ca cun dy my bin p bin ng st khi ti im trungtnh s gim mt phn, do chng st van t trung tnh c chn c in p nhmc gim mt cp.Ta chn chng st van loi 3EE1Vy ta c bng tng kt thng s cc loi chng st van:

Bi Danh Ngc D4H22

Page 68

n nh my in

Bi Danh Ngc D4H22

Page 69Loi chngst vanCpin pkVin p ln nhtca likVin p lmvic ln nhtkVDng in phngnh mckAVtliuvSiC22024521650/63S3EP111017018640S3EE13536421S

n nh my in

CHNG 6

CHN S V THIT B T DNG

in t dng l mt phn in nng khng ln nhng li gi mt phn quan trng trongqu trnh vn hnh nh my in, n m bo hot ng ca nh my nh : chun bnhin liu, vn chuyn nhin liu, bm nc tun hon, qut gi, thp sng, iu khin,tn hiu v lin lc ...in t dng trong nh my nhit in c bn c th chia lm hai phn :- Mt phn cung cp cho cc my cng tc m bo s lm vic ca l v tua bin cc tmy.- Phn kia cung cp cho cc my cng tc phc v chung khng lin quan trc tip n lhi v tuabin nhng li cn thit cho s lm vic ca nh my.Ta chn s t dng theo nguyn tc kinh t v m bo cung cp in lin tc,i vinh my in thit k ta dng hai cp in p t dng 6,3kVv 0,4kV.

6.1.Chn my bin p t dng cp 1Cc my ny c nhim v nhn in t u cc my pht 10,5 kV cung cp cho ph tit dng cp in p 6,3 kV phncn li cung cp tip cho ph ti cp in p 0,4 kV.Cng sut nh mc ca my bin p t dng cp 1 c chn nh sau :

S dmB1S Fdm

STD maxn

Trong : l h s % t dngn l s my pht trong nh my

SdmB1

STD maxn

18, 75 6, 25 MVA3

Ta chn my bin p loi TM 10000 c cc thng s nh sau :

My bin p d tr : c chn ph hp vi mc ch ca chng : my bin p d trch phc v thay th my bin p cng tc khi sa cha .Cng sut my bin p d trc chn nh sau :

SdmBdt 1,5.

STD maxn

1,5.

18, 753

9, 4 MVA

Bi Danh Ngc D4H22

Page 70Loi my binpUmC(kV)UmH(kV)SmB(kVA)P0(kW)PN(kW)UN%I0%TM 10000106,31000014,585140,8

n nh my in

Ta chn my bin p d trloi TMHC 10000c cc thng s nh sau:

6.2.Chn my bin p t dng cp 2Cc my bin p t dng cp 2 dng cung cp in cho ph ti cp in p 0,4 kV vchiu sng. Cng sut ca cc loi ph ti ny thng nh nn cng sut my bin pthng c chn loi my c cng sut t 630-1000 kVA. Loi ln hn thng khngc chp nhn v gi thnh ln v dng ngn mch pha 0,4kV ln.Cng sut ca my bin p t dng cp 2 c chn nh sau :

SdmB 2 (1015)%.

STD maxn

(1015)%.

18, 753

(625 938) kVA

Vy ta chn loi my bin p c cc thng s sau :

6.3.Chn my ct pha cao p ca my bin p t dng cp 1Chn tng t nh vi my ct ca cp in p 10,5 kV c la chn trong chng46.4.Chn my ct pha h p ca my bin p t dng cp 1

* Chn my ct hp b:

chn my ct hp b ta tnh dng in ngn mch ti N8 di my bin p tdng cp I, vi ngun cung cp l c h thng v cc my pht in ca nh my.

Nh ta tnh chng ngn mch: I N'' 5 77, 201kA,

Bi Danh Ngc D4H22

Page 71LoiSmkVAin p (kV)Tn tht (kW)UN %Io%LoiSmkVACuncaoCunhPoPNUN %Io%TC3- 1000/10100060,4311,25,51,5

Loi my binpUmC(kV)UmH(kV)SmB(kVA)P0(kW)PN(kW)UN%I0%TMHC1000010,56,36300846,580,9

n nh my in

Et

XHT

N4

XB

N7

Vy in khng ca h thng tnh n im ngn mch ti N5 l:

XHT = 0,687

- in khng my bin p t dng.

XB =

.100 Sdm

14 1000.100 10

14

- Dng in ngn mch ti im N8

I N'' 8

I cbX HT X K

1000 3, 744kA3.10,5.(0, 687 14)

- Dng in xung kch ti im N8:

ixkN8 =

2 .kxk.IN8 =

2 .1,8.3,744 = 9,531 kA

Coi dng in lm vic cng bc bng dng in lm vic mch d phng khikhi ng hoc dng l.

Icb =

S dmB 13.6,3

100003.6,3

= 916,4 A

Vy ta chn loi my ct in t du c thng s nh sau:

Ta khng cn kim tra n nh nhit cho my ct v c dng nh mc ln hn1000A.Ta c s ni in t dng ca ton nh my :

Bi Danh Ngc D4H22

Page 72Loi my ctUm (kV)Im (A)Icm (kA)Il (kA)BM-10-1600-201016002052

U N % Scb

n nh my in

6kV

0.4kV

Bi Danh Ngc D4H22

Page 73

n nh my in

TI LIU THAM KHO

1. Phn in trong nh my in v trm bin p TS. o Quang Thch

2.3.4.5.6.

Thit k nh my in v trm bin p PGS. Nguyn Hu KhiThit k phn in nh my in v trm bin p PGS.TS. Phm Vn HaNgn mch trong h thng in GS.TS. L Vn tThit k cp in Ng Hng Quang, V Vn TmHng dn thit k tt nghip k thut in cao p Nguyn Minh Chc

Bi Danh Ngc D4H22

Page 74

n nh my in

Mc Lc

LI M U ................................................................................................................. 1

CHNG 1..................................................................................................................... 2

CHN MY PHT IN, TNH TON PH TI ....................................................... 2

V CN BNG CNG SUT....................................................................................... 2

1.1.Chn my pht in............................................................................................ 2

1.2.Tnh ton ph ti v cn bng cng sut ........................................................... 2

1.2.1. th ph ti in p my pht (ph ti a phng) .......................................................... 31.2.2. th ph ti trung p .......................................................................................................... 31.2.3. th ph ti ton nh my .................................................................................................. 41.2.4. th ph ti t dng ca nh my ...................................................................................... 51.2.5. th cng sut pht v h thng ........................................................................................ 5

CHNG 2..................................................................................................................... 7

XC NH CC PHNG N V CHN MY BIN P ........................................ 7

2.1.1.Phng n 1 .......................................................................................................................... 82.1.2.Phng n 2 .......................................................................................................................... 92.1.3.Phng n 3 ........................................................................................................................ 102.1.4.Phng n 4 ........................................................................................................................ 11

2.2.Tnh ton chn my bin p cho cc phng n............................................. 12

2.2.1.Phng n 1 ........................................................................................................................ 12b.Phn b cng sut cho ccmy bin p ....................................................................................... 132.2.2. Phng n2 ........................................................................................................................ 20

CHNG 3................................................................................................................... 27

TNH TON DNG IN NGN MCH .................................................................. 27

I.Tnh ngn mch ................................................................................................... 27

1.Phng n 1: ............................................................................................................................. 27II.Phng n 2: ............................................................................................................................. 33

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n nh my in

CHNG 4................................................................................................................... 40

TNH TON CHN PHNG N TI U ............................................................... 40

4.1. Chn s ni in chnh cho cc phng n ............................................... 40

4.2. Tnh ton kinh t ca cc phng n.............................................................. 40

4.2.1. Phng n 1 ....................................................................................................................... 404.2.2. Phng n 2 ....................................................................................................................... 43

CHNG 5................................................................................................................... 46

CHN KH C IN V DY DN .......................................................................... 46

5.1.Chn my ct in v dao cch ly .................................................................... 46

5.2.Chn thanh dn cng cho mch my pht in.............................................. 47

5.3.Chn s thanh dn cng mch my pht in........................................... 50

5.4.Chn thanh dn mm ....................................................................................... 51

5.5.Chn my bin p o lng ............................................................................. 55

5.6.Chn cp v khng in cho ph ti a phng............................................ 60

5.7. Chn chng st van.......................................................................................... 67

5.7.1. Chn chng st van cho thanh gp ...................................................................................... 675.7.2. Chn chng st van cho my bin p................................................................................... 67

CHNG 6................................................................................................................... 69

CHN S V THIT B T DNG ..................................................................... 69

6.1.Chn my bin p t dng cp 1 ..................................................................... 69

6.2.Chn my bin p t dng cp 2 ..................................................................... 70

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