Ti liu Bi hun Vn hnhTrm 220KV Sc Sn ---------------------------------------------------------------------------------------------------------------------------------------- ------------------------------------------------------------------------------------------------------mr.nam e1.19ss ---- 1Mc lc Cu 1: S nht th trm Sc Sn. Cu 2: Nguyn tc nh s thit b.Cu 3 : X l s c MBA lc v MBA t dng. Cu 4: Nguyn l lm vic ca MBA. Cu 5: Kim tra MBA trong vn hnh. Cu 6: Thng s k thut MBA. Cu 7: Thit b ph MBA. Cu 8: Nguyn nhn pht nhit v phng thc lm mt MBA Cu 9: iu p khng in v di ti. Cu 10: nh ngha v ngha cc thng s MBA, gin nng lng. Cu 11: Th nghim MBA sau lp t. Cu 12: Kh nng qu ti ca MBA. Cu 13: iu kin vn hnh song song 2 MBA. Cu 14: T u dy ca MBA. Cu 15: Du MBA. Cu 16: Bo v MBA. Cu 17: Rle REL 521 v Bo v cc DZ 220, 110kV.Cu 18: Rle REF 541 v Bo v DZ 22kV. Cu 19: Mch chng gi gi v Mch khng ng pha. Cu 20: Nguyn tc ca mt s bo v. Cu 21:Thng s B t 110 KVv bo v. Cu 22: Phng thc BV l lin lc 100, 200. Cu 23: Phng thc BV SL Thanh ci. Cu 24: Thng k thit b nht th. Cu 25: Chng st. Cu 26: Thng s cc loi Dao Cch Ly. Cu 27: Nguyn l, ch lm vic ca TI.Cu 28: Nguyn l, ch lm vic ca TU.Cu 29: H thng t dng AC.Cu 30: H thng t dng DC.Cu 31: Chm t mt chiu. Cu 32: ng c khng ng b 3 pha. Cu 33: ngha thng s my ct.Cu 34: Thng s cc loi My Ct. Cu 35: Cc loi b truyn ng ca MC. Cu 36: HQ trong MC. Cu 37: Kim tra my ct trong vn hnh, h hng thng gp. Cu 38: Nguyn l dp HQ ca MC SF6. Cu 39: Th nghim MC v DCL sau lp t v sa cha. Cu 40: Phiu thao tc.Cu 41: Quy trnh s l s cDZ. Cu 42: X l s c mt in ton trm. Cu 43: Quan h cng tc gia trc ca viA1, B0 , B1, lnh o. Cu 44: Ch lm vic ca im TT trong HT. Cu 45: ngha cc loi ni t.Cch b tr ni t trong trm. Cu 46: ngha vt l v cng thc quan h ca U, I, P, Q, cos. Cu 47: Cc phng php iu chnh in p.Cu 48: Th nghim h s tn hao in mi tg. Cu 49: Cc bin php gim tn tht in nng v Nng cao h s cos . Cu 50: Cp cu ngi b in git. Cu 51: English. Cu 52:H thng cu ho. Ti liu Bi hun Vn hnhTrm 220KV Sc Sn ---------------------------------------------------------------------------------------------------------------------------------------- ------------------------------------------------------------------------------------------------------mr.nam e1.19ss ---- 2Cu 1: S nht th trm Sc Sn. - S ni in chnh T220KVSS pha 220&110 kV c ni theo kiu hai hthngTGcTGvng.Pha22kVnitheokiumththngTGgm2 phn onri nhau: Mt TC c cp t MBAAT1 ch cp cho MBA t dng TD41. Mt TC c cp t MBA T4 cp cho MBA t dng TD42 v mt s ph ti 22 KV.- TU, TI ca cc DZ 110 kV v 220 kV nm ngoi DCL -7. L MBA TI nm ngoi DCL -3. - MC 100, 200 va l MC lin lc, va l MC vng .Trong ch lm vic bnh thng lm nhim v lin lc. Khi thay th cho l bt k lm nhim v MC vng. 200tu dztu c29 tu c22 tu c21 c29 c22 c21 at1, at2 231 232 dz 271I275 271I275 -38 -35 -9 -3 -1 -2 -9-9-7 -75-76-15 -1 -2 -1-2-24 -14-15-3tu c11tu c12 tu c19 c12 c11 c19 101tbn 101dz 171I175 171I175 131 132 134 -1 100-9 -9-1-1 -2 -2 -2-3 -3-7 -1-2-76 -75 -15-95-15-15 -94-14 -24-06 -05 -0-9 -9 -35 -38 -15 at1,at2,t4 Ti liu Bi hun Vn hnhTrm 220KV Sc Sn ---------------------------------------------------------------------------------------------------------------------------------------- ------------------------------------------------------------------------------------------------------mr.nam e1.19ss ---- 3 1-u nhc im ca s ni in pha 220 kV v 110 kV: + u im: -TU,TIDZnmngoiDCL-7,TIlMBAnmngoiDCL-3nnkhi dng MC 100 hoc 200 thay cho mt ngn l khng phi t li thng s chnh nh RL.- Kh nng pht trin ph ti cao. - tin cy cung cp in cao. - Tit kim c mt l MC vng. - Thao tc chuyn i n gin. Nhc im: - Khi dng MCLL thay cho mt ngn l khc th phi ni cng hai TC bng DCL m bo phn b cng sut ca h thng, khi nu s c BVSL TC tc ng s mt in ton trm. -KhiRLBVhocTU,TIcamtngnlhhng,thphingngcung cp in ngn l . - Lin ng cc thit b phc tp. 2-u nhc im ca s ni in pha 22 kV:u im: - S n gin, d dng cho vn hnh. - L t hp b hin i dng GIS c kh nn SF6 khoang MC v khoang TC p lc 0,2 bar. C tin cy rt cao.Nhc im: - Khi SC thit b mt ngn l th C MC,DCL cng TC b mt in. - Lin ng DCL - MC - T phc tp. - Khng nhn thy khi DCL m (ch kim tra bng tn hiu). - Kh bo dng v th nghim. 478 476474AT1 T4AK TG TD42442 431 434TD41 -25-24-14 -15 -1 -2C42T401 C41 tu c42tu c41 -2-2 -2-2472-2-25-25 -25-25Ti liu Bi hun Vn hnhTrm 220KV Sc Sn ---------------------------------------------------------------------------------------------------------------------------------------- ------------------------------------------------------------------------------------------------------mr.nam e1.19ss ---- 43- Chc nng v ngha thit b trong s : * MBA: MBAlthitbinttnh,lmvictrnnguynlcmngint, dngbinihthngdnginXCcinpnythnhmththng dnginXCcinpkhcvitnskhngi.MBAcnhimvchnh truyn ti cng sut t cp in p 220 kV sang pha 110 kV v 22 kV. * MC:MC 110 , 220KV l loi MC SF6, MC 22KV l MC chn khngL thit b dng ng ct dng in in p cao. My ct SF6 c kh nng dp tt HQ nhanh, SF6 t b phn hu do qu trnh ng ct. S ln ct s c cho php ln. nh k ntiu tu, i tu di. Lm vic tin cy, t hng hc. * TU: Kiu t phn pDngbiniinpcaoxunginpthpolngbngcc dng c o lng v cung cp tn hiu cho rle bo v.* TI: Dng bin i dng in ln xung dng in nh o lng v cung cp tn hiu cho rle bo v.* DCL: Dng ng, ct mch in cao p khi khng c dng in hay ng p. DCL to khong cch cho nhn vin VH hay SC c th nhn thy.* DT:Dng tn in tch tn d, in p cm ng trn thit b hay DZ. Ti liu Bi hun Vn hnhTrm 220KV Sc Sn ---------------------------------------------------------------------------------------------------------------------------------------- ------------------------------------------------------------------------------------------------------mr.nam e1.19ss ---- 5Cu 2: Nguyn tc nh s thit b. MBA: K hiu T, sau T l s th t. MBA t ngu: K hiu AT, sau AT l s th t. TC:KhiuC,chstiptheochcpinp,chstipnaltnon TC. V d: C12 TC cp in p 110 kV, TC s 2. My bin in p: K hiu TU. Sau ch TU l du cch. Phn tip theo l tn cp in p v v tr t TU.(Nu t cho on TC no th km theo tn TC v d TU-C21, nu t cho DZ ly tn DZ) Mybindngin:KhiuTI.SaunduphncchltnMCicng bin dng. My ct: K hiu MC. C 3 ch s Ch s u c trng cho cp in p 1:110 kV; 2:220 kV; 3:35 kV;4:22 kV;5:500 kV;6:6 KV;9:10 KV -Ch s th 2 ch v trmy ct c u vo c quy nh nh sau: 0:MC vng;1:MC lin lc; 3:MBA lc; 4:MBA t dng;5:Tb;7v 8:DZ - Ch s tip theo ch s th t cc ngn l: 0: Lm lin lc(100, 200); 1 n 9: S th t MC. nh s dao cch ly: K hiu DCL. C 4 ch s Ba ch s u ch tn my ct trc tip vi DCLCh s th 4 ch thit b dao cch ly u vo 0: u vo cun dp HQ 1,2,9: u vo TC1,TC2,TC9. 3: u vo MBAlc 7: u vo DZ nh s dao tip a: K hiu DT. C 5 ch sBn ch s u ch tn DCL c lin quan trc tipCh s th 5 c trng cho tip a , quy nh nh sau : 4:Thanh ci;5:My ct;6:ng dy;8:MBA nh s t b: K hiu TBN cho t b ngang, c 3 ch s: S u l cp in p, s th hai ly s 0, s th 3 l s th t b t. K hiu TBD cho t b dc, c 3 ch s: S u l cp in p, s th 2 ly s 0, s th 3 l s th t DZ. * My ct v DCL t in: MC t c ch T u sau d ly 3 ch s: - Ch s th nht th hin cp in p. - Ch s th 2 ly ch s 0 . - Ch s th 3 ly s th th t ca DZ u vo t. Tn DCL u vi t c 4 ch s : - 3 ch s u l tn MC , s tip theo nu pha DZ c s 7 v pha TC ly tn TC m DCL u vo. Ti liu Bi hun Vn hnhTrm 220KV Sc Sn ---------------------------------------------------------------------------------------------------------------------------------------- ------------------------------------------------------------------------------------------------------mr.nam e1.19ss ---- 6nh s t dng: MBA t dng c k hiu bng ch TD v 2 ch s km theo, s th nht l s 4 ch mc ch t dng, s th hai ch s th t ca MBA t dng. My ct in ca MBA t dng c 3 ch s, ch s u ch cp in p, ch s th hai l s 4 ch mc ch t dng (cp in p 0,4kV), ch s th 3 ch s th t. *DCL in khng: Tn DCL ni vi in khng c 4 ch s- S u th hin cp in p- S th 2 ly s 0 - S th 3 ch th t ca l in khng . - S th 4 l s on TC u vi in khng . * in khng: KhngbngangcchKH,KhngTTcchKTTT.3ssaultntnin khng. DCL c phn cch gia khng b ngang v khng TT c 4 ch s: 3 ch s u c tn khng, ch s th 4 quy c ly s 0. * Chng st:Chng st ly ch CS v 4 s tip theo. 3 s u l cp in p, s th 4 l s th t DZ hoc MBA, nu chng st cho khng in th sau ch CS l tn ca khng . Ti liu Bi hun Vn hnhTrm 220KV Sc Sn ---------------------------------------------------------------------------------------------------------------------------------------- ------------------------------------------------------------------------------------------------------mr.nam e1.19ss ---- 7Cu 3: X l s c MBA lc v MBA t dng. * X l s c MBA lc: - Trng hp MBA b ct ra do BV ni b (So lch, hi, p lc, nhit ) cn tin hnhkimtratiMBA,thnghimmyvphntchkhxcnhnguyn nhnctMBA.ChchophpngMBAsaukhikhcphccchhngv c s ng ca Gim c hoc Ph gim c k thut cng ty. - Trng hp MBA ct do cc BV khc bn ngoi (SL thanh ci, h hng MC..) thchophpngMBAsaukhikimtratnhtrngbnngoimybnh thng v khc phc nhng nguyn nhn dn n ct MBA. -Khirlehitcngbotnhiucnkimtrabnngoimyvlykh phntch,kimtramusc,tnhchtchycakh.Khiphthinvkimtra thy cc du hiu h hng r rng (rn nt, chy, chy du) phi ct ngay MBA. - Nu khng c du hiu h hng nhng kt qu kim tra kh thy kh chy c hoc trong kh c cc sn phm ph hu lp cch in th phi ct ngay MBA. - Nu kim tra thy khng c cc hin tng trn, cho php MBA lm vic tip nhng phi theo di thng xuyn, nu c xut hin kh trong rle v bo v tip tcbotnhiuthphibongaychoA1,B0,Gcphngn,vtm nguyn nhn. * MBA phi ct ra khi vn hnh khi c cc hin tng sau: - C ting ku mnh, khng u. - S pht nng tng bt thng, lin tc trong iu kin bnh thng v ph ti nh mc. - Nhit lp du trn tng n 1050C, nhit cun dy tng n 1200C- Du chy qua van t x p lc hoc thng du ph (mc du vt max). - Mc du h thp di mc quy nh trn BDP (mc min) hoc mc du tip tc h thp m khng c kh nng khc phc nu khng ct in my. - Thay i mu sc ca du t ngt. Tnh cht ca khTnh cht s c Mu vng khng t chy cG b chy Mu tro nht, mi hi, t chy c Giy, cc tng cch in b chy Mu , mu en d chyDu b chy, phn hu -Cchvvnt,xuthinduvtphnginmts,mtmy,phngv my. - Sau khi tm ra nguyn nhn v khc phc cc hin tng trn, ch cho php vn hnh li MBA khi c lnh ca Ph gim c k thut hoc G cng ty. -TtcmixltrongvnhnhMBAkhiccchintngkhngbnh thng v s c phi ghi vo s nht k vn hnh v l lch ca MBA. Ti liu Bi hun Vn hnhTrm 220KV Sc Sn ---------------------------------------------------------------------------------------------------------------------------------------- ------------------------------------------------------------------------------------------------------mr.nam e1.19ss ---- 8*Xl s c MBA t dng : Khi kim tra thy MBA c cc hin tng khng bnh thng nh chy du, mc du trong thng du MBA thp (Tn hiu phao du mu ), nhit MBA tng cao, ting ku khng bnh thng... th NVVH phi phn on cc kh nng cthgyra.NuthyhhngmhngcnthitphictngayMBA,th NVVH trong ca phi theo di lin tc.Nu cc hin tng ko di hoc tng nhanh th phi bo co vi k thut vin, trm trng xem xt v bo co vi B0, A1 xin ct MBA t dng kim tra v sa cha. * i vi nhng trng hp sau y phi tch MBA ra khi vn hnh: - My c ting ku mnh, khng u v rung chuyn bn trong. - Tng nhit bt thng v lin tc trong iu kin ph ti bnh thng. - D r du hoc van an ton lm vic.- Mc du ct ch th chuyn sang mu . - Cc s u vo b v, rn nt gy phng in b mt. - t cu ch 1 hay nhiu pha. Trc khi a MBA ra khi vn hnh phi chuyn i t dng theo trnh t : CtQ1hocQ2ngvimybsc,ngptmtQ3nihaithanh ci. Ct MC 22KV tng ng, ct DCL ph ti (sau MBA t dng).i vi trng hp s c MBA nh qu dng, ngn mch, chm t... lm bo vpha22KVtcngctMCthNVVHphixcnhchnhxcbovno tcng,kimtrabnngoi,tnhtrngccthitbph,vmy,cplc,cu ch, s cao v h p. Dng ng h Mgm o tr s in tr gia cun dy vi t v cch in gia cc cun dy ca MBA phn on v tm nguyn nhn s c. ng thi bo co vi k thut vin, trm trng xem xt v bo co vi B0, A1, phng k thut trm, gim c kim tra, tm nguyn nhn v sa cha. CmNVVHtngngliMBAvolmvickhichatmcnguyn nhn s c v khim khuyt cha c khc phc. ChaMBAvokhikhcphcxongnguynnhnscvcy binbntheoquynhvcsngcagimchocphgimck thut. TtcmixlcchintngbtthngvscMBAtdnguphi ghi y vo h s, l lch caMBA. Ti liu Bi hun Vn hnhTrm 220KV Sc Sn ---------------------------------------------------------------------------------------------------------------------------------------- ------------------------------------------------------------------------------------------------------mr.nam e1.19ss ---- 9Cu 4: Nguyn l lm vic ca MBA. 8.1-Nguyn l lm vic ca MBA: MBAlthitbinttnh,lmvictrnnguynlcmngint, dngbinihthngdnginXCcinpnythnhmththng dng in XC c in p khc vi tn s khng i. MBA 2 dy qun (1 pha). Dy qun SC c W1 vng, dy qun TC c W2 vngcquntrnlithp3.KhicinpXCU1tvodyqunW1 trong n s c dng in I1. Dng in ny sinh ra trong mch t mt t thng , mc vng vi c hai dy qun v cm ng trong chng cc sc in ng E1 vE2.NutrnuracamchTCctiZtthtrongnscdnginI2. Trn cc cc ca ti c in p U2. Nu khng k in p ri trn cc dy qun th c th coi gn ng U2 E2; U1 E1. Nu dng in trong dy qun SC bin i hnh sin vi tn s f1 th dng in v in p trong dy qun TC cng bin i hnh sin cng vi tn s . T thng do dng in sinh ra cng c dng hnh sin: = msint. Theo nh lut cm ng in t, s cm ng trong dy qun W1 v W2 l:e1 = -W1(d/dt) = - W1(d.sint/dt)= -W1mcost =2 E1sin(t -/2) (1) v e2 =2 E1sin(t -/2) (2) Trong : E1 = 2m 1 w = 2m 1 fw 2 = 4,44fw1m(3) E2 = 4,44fw2m(4) Cc biu thc (1) v (2) cho thy s cm ng trong dy qun chm pha sinh ra n mt gc 2. Theo (3) v (4) ta c t s bin ca MBA nh sau:k =E1/E2 = W1/W2.Nu b qua tn tht trn dy qun th c th coi: E1 U1 ; E2 U2. T s bin i in p gia cc DQ c tnh nh sau: k =E1/E2 = U1/U2. Biu thc lin h: MBA 1 pha: Cng sut nh mc:Sm = U2mI2m = U1mI1m Cng thc lin h : P = UI cos . Q = UI sin U1U2W1W2 I1I2Li thpTi liu Bi hun Vn hnhTrm 220KV Sc Sn ---------------------------------------------------------------------------------------------------------------------------------------- ------------------------------------------------------------------------------------------------------mr.nam e1.19ss ---- 10MBA 3 pha: Cng sut nh mc:Sm =3 U2mI2m =3 U1mI1m Cng thc lin hP =3 UI cos . Q =3 UI sin 8.2 So snh MBA t ngu v MBA 3 dy qun, u nhc im ca tng loi *Ging nhau: u l thit b in t tnh lm vic theo nguyn l cm ng in t. Bin i h thng dng in XC cp in p ny sang h thng dng in XC cp in p khc vi cng tn s. *Khc nhau: - MBA 3 dy qun gia cc cun dy ch lin h vi nhau bng t. - MBA t ngu gia cc cun dy lin h vi nhau c in v t. - MBA t ngu c cun dy th 3 khng lin h v in m ch lin h v t, ni tam gic nhm mc ch kh sng hi bc 3 ca in p. Tn hao CS:- Ch h p: MBA t ngu tn hao nh hn MBA 3 cun dy. - Ch tng p: Tn hao nh nhau. *u, nhc im ca MBA t ngu: Xt cng sut truyn qua MBA t ngu: Sc = ST. IT = IC + Ich; Int = IC;UT = UC - Unt; WT = WC - Wnt ST = IT.Uch = IT.UC - IT.Unt = IC.UT + Ich.UT

-Cng sut cun dy ni tip: Snt = Int.Unt = Ic(Uc - UT ) = Ic.Uc(1 - UUCT) = Ic.Uc = Sc = Sm : H s c li ca MBA t ngu. - Cng sut qua cun chung MBA t ngu: Sch = Ich.Uch = Uc(IT - Ic ) = IT.UT(1 - IITC) = Sm UCUT UH IT Ich, Wch Int, Wnt ICinT Ti liu Bi hun Vn hnhTrm 220KV Sc Sn ---------------------------------------------------------------------------------------------------------------------------------------- ------------------------------------------------------------------------------------------------------mr.nam e1.19ss ---- 11u im: +truyncngsutbngcngsutnhmcSmthMBAtnguch cn thit k vi dung lng l Sm. Trong < 1 v i vi MBA t ngu 2 cun dy cao v chung lin h vi nhau c bng in v t. + Gim nguyn vt liu ch to, gim kch thc ch to, do gi thnh h. + Un nh do in khng ngn mch gia cun cao v trung nh dn n tn tht in p nh, tn tht cng sut nh, iu chnh in p d dng hn. Nhc im ca MBA t ngu: + Ch dng c cho h thng Uc v UT ni t trc tip. + in p ngn mch Un nh, nu ngn mch pha h th dng ngn mch s rtln.iviMBAtngu3pha,khingnmch1phano,inppha cn li tng rt nhiu gy qu p. + Do c s lin h vi nhau v in nn xut hin sng qu in p t cao sang trung do cn phi t CSV. + Phi tng cng ch to cch in d phng. Ti liu Bi hun Vn hnhTrm 220KV Sc Sn ---------------------------------------------------------------------------------------------------------------------------------------- ------------------------------------------------------------------------------------------------------mr.nam e1.19ss ---- 12Cu 5: Kim tra MBA trong vn hnh. - Kim tra dng in, in p, cng sut, nhit . - Kim tra MBA khi c bt ng v thi tit.- Kim tra ting ku ca my. - Kim tra mc du trn BDP. - Kim tra nhit ca du v cc cun dy MBA. - Kim tra mc du trn cc u s 220 kV, 110 kV. - Kim tra tnh trng s xuyn, s . - Kim tra silicagen trong cc bnh th. Mc du trong cc du ca b th. - Kim tra s r r du trn thn my v cc mt bch. - Kim tra rle hi. - Kim tra v tr nc ca b iu p di ti. - Kim tra cc van du ng v tr vn hnh. - Kim tra cc ng h o lng v tn hiu my. - Kim tra tnh trng cc u ct bt dy dn vo my. - Kim tra cc tip a thn my v tip a trung tnh. - Kim tra cc chng st 3 pha my. S ln m st. - Kim tra h thng cu ho v cc trang b phng chy. - Kim tra h thng lm mt: + Cc van cnh bm phi v tr m. + Chiu quay, rung, ting ku ca cc qut gi, bm du. + Khng b r r du, s lu thng du trong cnh tt. + ng h ch th lu lng du c lm vic hay khng. Ti liu Bi hun Vn hnhTrm 220KV Sc Sn ---------------------------------------------------------------------------------------------------------------------------------------- ------------------------------------------------------------------------------------------------------mr.nam e1.19ss ---- 13Cu 6: Thng s k thut MBA. 1 - Thng s k thut MBA - AT1: - Loi : KTRT 245x86 - 125 MVA - Cng sut nh mc:Sm = 125/125/41,5 MVA ch ONAF. 60%Sm =75/75/24,9 MVA ch ONAN. - T u dy: Y0-yn/11. - T s bin p: 225 8x1,25% /115/ 232x2,25% kV. - Thi gian ln nht chu dng ngn mch i xng: 2 giy - in p ngn mch % 750C: Cngsutnhmc (KVA) Cun dyV tr ncinpngnmch (UN%) 125000C/T9/110,57 41500C/H9/329,92 41500T/H1/317,99 - Tn tht PN (khi y ti 750C):LoiCng sut(kVA) Cun dyV tr PN (kW) MBA AT1125000Cao/trung9/1155,38 - Dng khng ti:I0% = 0,11%Im Um - Cng sut tiu th qut gi: 0,43 kW - Cng sut khng ti (P0) Um: 38,6 kW -S:GOM-1050LF125-060B;GOB-550LF123-190K;GOB-325LF123-179K. - B th: WJKHM3; WJKHM32. - B CA Di ti: UCGRT-650/400. - B CA Khng in: BUE-1 - Du: Nynas Nytro, 53000 kg. - Trng lng my: 160400 kg -CchiuchnhtscaMBA:iuchnhbngcchthayisvngdy cun 220 kV nh b iu p di ti v thay i s vng dy cun 22 kV nh b iu chnh in p khng in. 2- Thng s k thut MBA - AT2: - Sn xut : NM ch to TB ng Anh. - Cng sut nh mc:Sm =125/125/25 MVA ch OFAF. 100/100/20 MVA ch ONAF. 60%Sm =75/75/15 MVA ch ONAN - T u dy: Y0-yn/11. - T s bin p: 225 8x1,25% /115/ 232x2,25% kV. - Thi gian ln nht chu dng ngn mch i xng: 2 giy. - in p ngn mch %: Cngsutnhmc (KVA) Cun dyV tr ncinpngnmch (UN%) 125000C/T9/111,15 Ti liu Bi hun Vn hnhTrm 220KV Sc Sn ---------------------------------------------------------------------------------------------------------------------------------------- ------------------------------------------------------------------------------------------------------mr.nam e1.19ss ---- 1441500C/H9/336,28 41500T/H1/321,42 - Tn tht PN:LoiCng sut(kVA)Cun dyV tr PN (kW) MBA AT1125000Cao/trung9/1298,568 - Dng khng ti:I0% = 0,048%Im Um. - Cng sut tiu th qut gi: (8x0,4) = 3,2 kW. -Cngsuttiuthbmdu:(2x0,55)=1,1kW.Loibm:PR200/6.Hng GEA. - Cng sut khng ti (P0) Um: 37,15 kW. - S: COT 1050-800; COT 550-1000; COT 325-800. (Hng HAEFLY) 24kV-1000A. - B th:- B CA Di ti: MI-501-170/C-10193W. Im=500A. Hng MR (c) - Du: Shell Diala BX. -CchiuchnhtscaMBA:iuchnhbngcchthayisvngdy cun 220 kV nh b iu p di ti. 3- Thng s k thut MBA - T4: - Loi : KTRT 123x28 25MVA. - Cng sut nh mc:Sm = 25/25/6,3 MVA ch ONAF. 60%Sm =15/15/3,78 MVA ch ONAN. - T u dy: Y0-yn/-o-11. - T s bin p: 1159x1,78% / 232x2,5% / 6,6 kV. - Thi gian ln nht chu dng ngn mch i xng: 2 giy - in p ngn mch % 750C: Cngsutnhmc (KVA) Cun dyV tr ncinpngnmch (UN%) 25000C/T10/310,7 - Tn tht PN: 76,07 kW. - Dng khng ti:I0% = 0,08%Im Um. - Cng sut tiu th qut gi: (6x0,43) kW. - Cng sut khng ti (P0) Um: 16,12 kW. - S: NLTD-36B-1000; NLTD-24B-1000; GOB-550-LF123-191. - B th: WJKHM1; WJKHM16. - B CA Di ti: UZERN/380-150. - B CA Khng in: UOR-800-LL/200021-F. - Du: Nynas Nytro, 16000 kg. - Trng lng my: 56000 kg -CchiuchnhtscaMBA:iuchnhbngcchthayisvngdy cun 110 kV nh b iu p di ti v thay i s vng dy cun 22 kV nh b iu p khng in. Ti liu Bi hun Vn hnhTrm 220KV Sc Sn ---------------------------------------------------------------------------------------------------------------------------------------- ------------------------------------------------------------------------------------------------------mr.nam e1.19ss ---- 15Cu 7: Thit b ph MBA. 1- Thng MBA:Thng my cha phn ng (Cc cun dy v li thp). Thng hnh hp ch nht, c ch to bng thp c gn chu lc xung quanh v di y. Mt my c c nh vi thng nh cc bu lng mt my. Trn mt my c cc mt bch lp cc TI, s u vo, ng du ln BDP, mt bch lp van t x p lc, v tr lp cc b cm bin nhit, mt bch ca thm ... Bn thnh c cc mt bch lp cc cnh du ca b lm mt, van np du, cc vu mc cu ... pha di thng c van x du y, van ly mu du, v tr lp tip a ... 2- H thng lm mt: Lm mt theo 2 phng php- Du tun hon t nhin qua cnh lm mt ONAN. - Du tun hon qua cch lm mt c qut gi cng bc khng kh:ONAF 1 2 346 51. Cnh tn nhit 2. Vt x kh ca cnh tn nhit 3. ng gp ca cnh 4. Van cnh bm 5. Qut lm mt1. S u vo 2. Thng my3. Thng du ph 4. T iu khin ti ch 5. Cnh tn nhit 6. tr 7. Qut lm mt 1 32456 7 Ti liu Bi hun Vn hnhTrm 220KV Sc Sn ---------------------------------------------------------------------------------------------------------------------------------------- ------------------------------------------------------------------------------------------------------mr.nam e1.19ss ---- 16H thng gm hai gin cnh v 6 qut hai bn thnh my, mi dn gm bn b cnh lm mt v 3 qut gi, cng sut mi qut l 0,43 KW. Hai u pha trn v pha di cc cnh lm mt c cc van cnh bm (van ny c kho khi tho cnh tn nhit sa cha hoc lp rp, khi VH bnh thng chng m ra).Khiqutchytothnhlungkhthiquacnhgipchoqutrnhtnnhit nhanh.Hthngqutgicthngnghocchybngtayhoctngnh kho ch t u dy v iu khin bn thnh my. Ch t ng: Nhm qut mt (1,3,5) khi ng khi nhit cun dy t ti 800C. Nhm qut hai (2,4,6) khi ng khi nhit cun dy t ti 950C. Khi ph ti t 60%Sm th phi cho nhm qut mt chy cng bc bng tay. 3 - T u dy v t iu khin lm mt MBA: T ny c lp bn thnh my, gm cc cp dn n cc b phn nh rle ga, rle p lc, ng h ch mc du, ng h nhit , qut, van x p lc v cp dn vo cc t iu khin, bo v MBA trong nh iu khin. Bn trong t gm mt ng h ch mc du, ba ng h ch nhit cun dy, mt ng h ch mc du ca thng MBA, cc hng kp u dy, kho chuyn mch, cng tc t, khi ng t, b sy, n ...Tdngthpccmchiukhin,bovchoMBA,iukhinlmmt MBA. B sy trong t c tc dng chng ngng ng nc m trong t nn phi thng xuyn duy tr trnh h hng cc b phn. 4 - B iu chnh iu p di ti: My c ba b iu chnh in p di ti loi UCGRT 650/400C t ring cho baphavmtbtruynngchungchocbab.Ccbiupcbtr u thng MBA. B iu chnh in p di ti gm b tip im chn nc, b tip im o trong thng my, b tip im dp h trong khoang ring.BT loi BUE1 nm ngoi MBA v c cc trc ni truyn ng ni ti cc b chn, cc b o v cc b tip im dp h ca ba pha. T cc tip im ca b dp h, b o v b chn c cc u dy ni ti cc nc vng dy qun ca cc cun dy MBA. 5 - B iu chnh in p khng in: B iu chnh in p khng in phaTTcccundy22kV.Ngmcc tip im chuyn nc t trong thng my, b thao tc chuyn nc ti ch bng tay t trn mt my (Mt BT chung c ba pha). C 5 nc iu chnh in p, b thao tc chuyn nc c tay vn xoay chuyn nc. Khi b iu p khng in ang ng v tr vn hnh, trc cht ca tay xoay v l hp cht ca mt ch th nc khp nhau. Khi mun thao tc chuyn nc phi ct in MBA, rt chc cht ra khi l hp cht, xoay tay vn n v t nc cn thit. Sau khi chuyn nc phi kim tra in tr mt chiu cc pha tt mi c php a my vo vn hnh. Ti liu Bi hun Vn hnhTrm 220KV Sc Sn ---------------------------------------------------------------------------------------------------------------------------------------- ------------------------------------------------------------------------------------------------------mr.nam e1.19ss ---- 176 - BDP:Dng gin n du cho thng du chnh, khi nhit my thay i lm choth tch du trong my thay i theo. Bnhgmhaingn:Ngnlnchothngduchnh,ngnnhchokhoang ADT. Bntrongngnlncchaticaosukn,mtngoicatitipxcvidu my, mt trong ca ti thng vi bnh th ngn ln t bn thnh my. 1. Thng du ph MBA 9. ng dn ti khoang AT 2. Ti cao su 10. ng dn ti thng my chnh 3. Thng du ph b ADT11. Rle gas 4. ng h ch mc du b ADT12. ng h ch mc du thng my chnh 5. Tay n 13. ng cha cht mao dn 6. Phao14. B phn c cu cha cht lng 7. Bnh th khoang ADT15. Cn phao 8. Bnh th thng du ph MBA

Ticaosuctcdngngnstipxctrctipgiaduvikhngkhca bnhth,nhhnchsxmnhpmtbnngoivodu.Victhca du ngn ln BDP gin tip thng qua mt trong ca ti cao su. Mt thong ca du ngn nh (Khoang ADT) thng vi bnh th th hai t thnh my. Nh vy nh hai bnh th nn p sut trong v ngoi my lun cn bng nhau. kim sot mc du bn trong BDP ngi ta s dng cc ng h ch th mc du ca BDP. Khi nhit trong thng my tng hoc gim th phao trong BDP s ln cao hoc xung thp khi s tc ng vo b phn truyn cha cht lng ni st vi pha di BDP v ni ti ng h ch th mc du, s lm cho ch th ca ng h mc du trong t trung gian tng hoc gim. 23 18 7 9 10 11 4 56 1213 1415 Ti liu Bi hun Vn hnhTrm 220KV Sc Sn ---------------------------------------------------------------------------------------------------------------------------------------- ------------------------------------------------------------------------------------------------------mr.nam e1.19ss ---- 187 - Bnh th: MBA gm hai bnh th :- Mt cho BDP MBA, qu trnh th gin tip thng qua ti cao su .-Mt cho cho BDP b iu chnh in p, th trc tip . Bnh th c tc dng lm cho khng kh c lc sch bi v m trc khi i vo cc ngn ca BDP do khng lm gim cht lng du. 8 - S u vo: S t du pha 220, 110 kV v s gm c pha 22 kV. Cu to s 220kV v 110kV: U chu ng vi TSCN : 1050 kV in p nh mc :245kV Dng nh mc 1600 A Nhit t -400 n + 800C hp gin nknh kim tra l so gin nsdu nt kim tra tg van bithn tng gin nS cch inTi liu Bi hun Vn hnhTrm 220KV Sc Sn ---------------------------------------------------------------------------------------------------------------------------------------- ------------------------------------------------------------------------------------------------------mr.nam e1.19ss ---- 19- Trn cng c hp gin n (Cha l so). Khong gia t v sc y du MBA.Gialnglundy.Trnhpginnc2mtknhkimtramc du. Pha di c mt bch bt vo my, trn mt bch c van bi v nt kim tra tg. 9 - Rle ga v rle dng du: - Rle ga: +LoiOYOS80B2clptrnngngdndutBDPxung thng du chnh MBA, dng bo v MBA khi c cc h hng bn trong thng my, lm xut hin kh. C hai mc: Mc bo tn hiu v mc ct 3 pha MBA.+Rlegmchaiphaognvihaicptipimthungnct trongrle ga. Bnh thng c hai phao ni, hai cp tip im h mch. Khi c hhng(Phngin,chy,chpvngdy...)phtsinhhi,hitheongdn du ln phn trnrle ga y phao ca rle ga chm xung.Khi s c nh lng kh thot ra chm v t y phao 1 pha trn chm, cp tip im th nht khp mch a i bo tn hiu. Khi s c nng lng kh thot ra nhanh, nhiu y phao 1 v 2 ca RL ga chm, c hai cp tip im u khp li, bo tn hiu v tc ng ct MBA. +Khimcdutrongrlegathphockhngcthrlegacngkhp mch tc ng ct 3 pha MBA. + Trong rle ga cn c rle dng du. Khi s c bn trong MBA vi nhit lng ln lm du gin n mnh, du t thng chnh MBA chy nguc ln thng du ph vi tc 2m/s, cnh chn du cng khp tip im ct 3 pha MBA. +Trnnprlegacntthtcngcarlega(Ctmy).Ntny dngthccmchbovMBAkhihiuchnh.CvanxEdngx khng kh d khi mi lp my hay qu trnh vn hnh lu ngy kh tch t trong rle ga. Ngoi ra cn c van ly mu kh, van ny c ni vi thit b ly mu t thnh my thng qua ng ng. 10 - Rle p lc t bin (): - Gm hai loi:+ Mt rle p lc bo v cho thng my loi C1P404M - 87B - SZG1. + Ba rle p lc bo v cho 3 khoang iu p di ti loi LL114. - Rle tc ng khi c s c chy n trong thng MBA v khoang AT lm p lc tng t ngt. Lc tip im ca rle khp gi tn hiu i ct 3 pha MBA. - Tr s tc ng l 700 Bar. - Rle gm: thn rle, hp tip im, mt bch lp rp, van tay dng ng li khi rle v tr lm vic v m ra khi cn th rle. 11- Van phng n: -Lmnhimvbovthngmykhibnkhiplclndoscxyra trong thng MBA. -Khiplctrongthngmylnhnp lccavanthvantngmvx du ra ti khi p lc ca l xo thng p lc du trong my th van ng li. ng thi gi tn hiu i ct MBA. - Tr s tc ng: 10 Psi 0,07 Mpa. - Van c 2 ly: 1 ly th tc ng v 1 ly gii tr. Khi van tc ng cn phi gt ly gii tr a vo lm vic.Ti liu Bi hun Vn hnhTrm 220KV Sc Sn ---------------------------------------------------------------------------------------------------------------------------------------- ------------------------------------------------------------------------------------------------------mr.nam e1.19ss ---- 2012- H thng gim st nhit my: - Gm: mt b o nhit lp du trn, ba b o nhit cun dy cc pha. ng h o nhit du: B cm bin nhit t trong hc cha du trn mt my qua ng mao dn ni t b cm bin n ng h ch th nhit t trong t u dy MBA. S thay i nhit lp du trn qua cm bin nhit c ng mao dn a ti c cu ch th nhit gip ta quan st c nhit . ng h nhit du : 900C bo tn hiu. 1050C i ct MBA . + Cu to ng h o nhit du1-Nhit k3-ng mao dn4-Hng kp tip im5-Chit p cho hin th t xa hinthnhitvomytnhtrongnghcbPT100chuynitn hiu. Cp ngun cho PT100 ng h o nhit cun dy : loi UCWMC and Pt 100 -Gm c : 3 ng h o nhit cun dy ba pha cao, trung v h p.Nguyn l lm vic : C 3 b cm bin nhit cun dy cao , trung, h qua ng mao dn n ng h nhit ca cun dy, kt hp dng t bin dng cc s pha A 3 pha tng ng. -ng h nhit cun dy: 1050C bo tn hiu. 1200C i ct MBA. + Cu to 6162 11 12 14 21 2224 31 32 34 4142 13 4PT100 4 - 20 mA + 4 - 20 mA -L 1 N B chuyn i 24V Ti liu Bi hun Vn hnhTrm 220KV Sc Sn ---------------------------------------------------------------------------------------------------------------------------------------- ------------------------------------------------------------------------------------------------------mr.nam e1.19ss ---- 21

1- Nhit k 11 - 12 - 14 : Bo tn hiu 1050C 3- ng mao dn21 - 22 - 23 : Tip im ct MBA 1350C 11- in tr 31- 32 - 34 : Tip im chy qut mt 12- Hng kp tip im 41- 42 - 44: D phng13- Bin dng chn s pha A61 - 62 : B chuyn i ch th t xa15- in tr tng hp 13- Cc bin dng: MBA c 10 bin dng t cc chn s u ra 3 pha 3 pha v TT Cun th 3 ca cc bin dng t pha A cc pha cung cp tn hiu cho b o nhit cun dy. Cc bin dng cn li cung cp tn hiu cho cc mch bo v. P1 P2 6162 11 12 14 21 22245 51 31213 11 15 Ti liu Bi hun Vn hnhTrm 220KV Sc Sn ---------------------------------------------------------------------------------------------------------------------------------------- ------------------------------------------------------------------------------------------------------mr.nam e1.19ss ---- 22Cu 8: Nguyn nhn pht nhit v phng thc lm mt MBA Nguyn nhn pht nhit*Cc nguyn nhn MBA b qu nhit: 1. Qu nhit do qu ti. 2. Qu nhit do qu p. 3. Qu nhit do nhit mi trng qu cao. 4. Qu nhit do mc du gim thp. 5. Qa nhit do s i lu ca du km. 6. Trong MBA c mt s vng dy b ngn mch. 7. Hng cch in gia cc l thp mch t, ngn mch cc b cc l tn, chy trong mch t, tn hao trong li thp tng lm MBA b nng. *Phn tch: Khi lm vic, tn tht trong MBA s bin thnh nhit nng lm tng nhit canvtoradu,ccbphncaMBAvmitrngxungquanh. Ngun nhit ch yu to ra t cc cun dy, do tn hao trong cun dy (chim khong80%tnhaotng).HiusutcaMBAccngsutlntn 99,499,5%. tn hao trong chng khong vi trm kW. Thc nghim cho thy, khinhitimnngnhtcacundyMBAlunlunbng980Cththi gian phc v cch in bng khong (20-25) nm. Ch to MBA vi tui th ln hn c coi l khng hp l, bi v vi s pht trin nhanh chng ca k thut cng ngh ch to nn cu to MBA cn phi thay i theo kp tin k thut. Nhit im ln nht ca cun dy cho php cao hn nhit trung bnh ca n l 130C, nh vy nhit trung bnh ca cun dy trong iu kin vn hnh nhmcl850C.StruynnhittrongMBActhchinbngdnnhit, bc x v i lu. Trn hnh biu din s phn b tng nhit t cun dy n mi trng khng kh xung quanh ca MBA du. * 1-2: Biu th s gim nhit trong cun dy, n khng vt qu vi .* 2-3: Biu th s thay i nhit t b mt cun dy n lp du tip gip. * 4-5: l s gim nhit t du n thnh thng. * 5-6: c trng cho s gim nhit trong thnh thng MBA. * 6-7: Biu ths gim nhit t thnh thng n mi trng xung quanh. % 12345670 20 40 60 80 x Ti liu Bi hun Vn hnhTrm 220KV Sc Sn ---------------------------------------------------------------------------------------------------------------------------------------- ------------------------------------------------------------------------------------------------------mr.nam e1.19ss ---- 23* Cc phng php lm mt MBA AT2: - ONAN: Du tun hon t nhin. - ONAF: Du tun hon c qut gi cng bc. - OFAF: Du tun hon c qut gi v bm du cng bc. MBA lm mt theo phng php du tun hon t nhin qua cnh lm mt c qut gi cng bc khng kh v bm du tng lu tc ca du. H thng lm mt ca MBA AT2 do NM ch to TB A sn xut, c b tr 2 dn cnh tn nhit 2 bn MBA. Gm 20 cnh lm mt, 8 qut v 2 bm lp hai bn thnh my. Mi qut ccng sut :400W, Tc : 640 v/p. Mi bm c cng sut : 0,55 kW. Tc : 960 v/p.Lu lng: 100m3/h.in p :380V HaiuphatrnvphadicccnhlmmtMBAcccvancnh bm dng lp rp vi thn MBA, van kho khi tho lp cnh hoc m ra khi vnhnh.Cutocnhlmmtgm2nggp,2umtbch,2vancnh bm, cnh tn nhit bn trong c du, vt x kh, vt x du cn, tai mc cu... KhiMBAvnhnh,dunngschylnphatrn,quacnhlmmt c h bt nhit v quay li MBA. Qutcbtrbndicadncnhlmmt,khiqutchyto lung kh thi qua cnh gip qu trnh tn nhit nhanh. Bm du c lp nh hnh v nhm lm tng thm tc vn chuyn ca du v do lm tng tc lm mt. H thng lm mt c th iu khin bng tay hoc t ng nh kho ch tiukhin.Trongchtng,qutvbmlmvictheonhit du bng sau: Nhit lp du trnNhit cun dy Qut chy 650 C700 C Qut dng 550 C600 C Bm chy 700 C750 C Bo tn hiu 900 C1000 C Ct my 950 C1050 C QutTi liu Bi hun Vn hnhTrm 220KV Sc Sn ---------------------------------------------------------------------------------------------------------------------------------------- ------------------------------------------------------------------------------------------------------mr.nam e1.19ss ---- 24Cu 9: iu p khng in v di ti. Ph ti ca cc h tiu th in u c s bin i lin tc lm cho in p ngun cung cp bin i theo. in p li bin i dn n in p TC ca cc trm phn phi bin i. Mun gi cho thit b lm vic bnh thng cn gi in p n nh hoc so vi in p nh mc khng chnh lch qu phm vi cho php. Do ta cn c b iu chnh in p. C nhiu phng phpiu chnh in p. Ph bin l phng php bin itsbincaMBAlmthayiinpuracaMBAbngcchthay i nc phn p. 1-iupditi:ThayitsbincaMBAbngcchthayisvng dy u ra m khng cn ct in. MBA vn lm vic bnh thng. 2- iu p khng ti: Thay i t s bin sau khi MBA c tch khili. Thng cc u phn p c t cun dy cao p v dng nh v d tho lp v thng cun cao p c qun pha ngoi. 3 - Phm v ng dng : *iu p khng ti : Thng dng cho MBA cm ng 2 cun dy v thng c 2 nc iu chnh so vi mc chnh lch (+/- 5%) t cun cao p. i vi MBA cng sut ln thng c 4 hay 5 nc iu chnh in p v t pha h p (Thng t thay i do yu cu ca ph ti). *iu p di ti : p dng cho cc MBA cng sut trung bnh v ln vi in p t 110 kV trln.CcDZ>110kVtruynticngsutln,phtitrongmtngythay i lin tc nht l vo cc gi cao im cho nn dng iu p di ti rt thun tin cho vic iu chnh in p, trnh c mt in v n nh in p nhanh chng. N c t cun cao p v c bung DHQ ring, du b iu p di tipctringvkhngthngvithngduchnhcaMBA.Bitrong qutrnhlmvicthngxuyniuchnhncdutrongbiupditi thngnhanhgimchtlnghntrongthngduchnh.Nuhintng xy ra ch cn x l s du trong b iu p di ti. Ti liu Bi hun Vn hnhTrm 220KV Sc Sn ---------------------------------------------------------------------------------------------------------------------------------------- ------------------------------------------------------------------------------------------------------mr.nam e1.19ss ---- 25Cu 10:nh ngha v ngha cc thng s MBA, gin nng lng. 1 - nh ngha : MBA l mt thit b in t tnh, lm vic trn nguyn l cm ng in t. Bin i h thng dng in XC in p ny thnh h thng dng in XC cp in p khc, vi tn s khng i. - Dy ni ngun gi l SC, dy ra gi l dy TC. 2 - Cc i lng nh mc : - Dung lng nh mc Sm hay cng sut nh mc - L cng sut ton phn (Hay biu kin) a ra y qun TC ca MBA. Tnh bng kVA hay VA. - in p SC nh mc U1m: L in p ca dy qun SC, kV hoc V. Nu c cc u phn nhnh ngi ta ghi c in p ca tng u phn nhnh. - in p TC nh mc U2m: L in p dy qun TC khi MBA khng ti v in p dy SC l nh mc. Tnh bng kV hay V. -DnginnhmcI1m,I2m:LdngincadyqunSCvTCvi cng sut nh mc v in p nh mc. Tnh bng A hay kA. - i vi MBA 1pha:I1m = Sm/U1m;I2m = Sm/U2m - i vi MBA 3 pha: I1m = Sm/ 3 U1m; I2m = Sm/ 3 U2m - Tn s fm tnh bng Hz (Thng c tn s 50 Hz ) - Ngoi ra trn my cn ghi : S pha, s v t ni dy, U ngn mch Un%. Un%:Lilngctrngchointrvinkhngtncadyqun MBA Thng biu din bng t l % so vi Um (c ghi trn nhn hiu my) Un% = (Un/Um).100 = (ImZn/Um).100 Un% = 5,5 15S u i vi MBA Um 35 KV. S sau i vi MBA Um = 500KV. in p t vo rt nh cho In = Im gi l in p ngn mch th nghim. Io% = (I0/Im).100 Io% : Dng phn khng t ho li thpio = ioxHay ni cch khc n c trng cho mc t ho li thp. Po:ilng c trngchotnhaosttkhikhngtiPo=PFe (tnhaot ho li thp) Tn hao khng ti khng thay i.Qo :L CSPK dng t ho li thp. Qo = mU1 Iox Pn : Cng sut ngn mch l i lng c trng cho tn hao ng trong myIn : Dng in ngn mch:In = Um / Zn = (Im / Un%).100 Dng ln s gy ra h hng MBA v cc thit b lin quan : Hiu sut MBA( 0 th Q2 > 0 v Q1 > 0 CSPK truyn t s sang th* Khi ti c tnh cm 2 < 0 th Q2 < 0 Th theo chiu ngc li . Ti liu Bi hun Vn hnhTrm 220KV Sc Sn ---------------------------------------------------------------------------------------------------------------------------------------- ------------------------------------------------------------------------------------------------------mr.nam e1.19ss ---- 27Cu 11: Th nghim MBA sau lp t. 1- Th nghim in p xoay chiu cao p: NhmnhgitnhtrngdyqunMBA.ThnghimbodngMBA vi60%inpthnghimxutxng.Tuynhinthnghimnycth khngthchincvcthlmhhicchindyqunMBA.Khith nghimbodngbnginpxoaychiucthsdnginpnhmc trong 3 pht thay cho th nghim vi 65 % in p th nghim xut xng. 2- Th nghim t s bin i: L t s in p pha s cp v th cp khi MBA ch khng ti. Ta c th xc nh t s bin i bng cc cch sau: a. Phng php o trc tip: Phng php trc tip o U1 v U2 bng vn k c cp chnh xc cao. t in p 220V-380V vo dy qun cao p o in p 2 dy qun. b. Phng php b ( phng php ch khng):t in p xoay chiu 8v ca my pht quay tay vo dy qun h p. Dy qun cao p c ni vi MBA chun v c cu ch khng , c gi tr t s bin ca MBA chun. Th nghim ny cho ta bit nh sau: -Xc nh t i v cc tnh ca MBA mt pha v 3 pha. -Khngtrsbinitrnbinmy,cctnhvvctin p. Th nghim ny c tin hnh vi mi v tr ca b CA khi khng ti. Xc nh dy qun b h hng nh h mch hoc ngn mch mt s vng dy. 3- Th nghim cc tnh ca dy qun: Dng ngun mt chiu ni vo dy qun dy qun kia c ni vi ng h vn nng ( vn k mt chiu). Khi ng ngun mt chiu vo von k ch thun th a v b cng cc tnh, nu vonk ch ngc th a v b khc cc tnh. S nh sau: 4- Kim tra t ni dy: T ni dy ca MBA 3 pha c trng gc lch pha gia in p dy SC v TC th nghim dng vn k o in p gia cc u tng ng v so snh gi tr thu c bng tnh ton. Ni A vi a a in p khng qu 380V vo mt trongdy qun v o in p Bb, bC v cB.

a b xy VVC BA cb a V Ti liu Bi hun Vn hnhTrm 220KV Sc Sn ---------------------------------------------------------------------------------------------------------------------------------------- ------------------------------------------------------------------------------------------------------mr.nam e1.19ss ---- 28Kt qu th nghim MBA T220 KV Sc Sn Kt qu tnh ton cho MBA c t ni dy 11. UbB= Ud1-1- Th nghim khng ti: 2- o in tr cch in: Dng Mgm ISOL 5003 nhit 20oC. TTCun dyTest volR15R60R60/R15 1Cao-H+t2500V220034001,54 2H-Cao+t2500V170024001,41 3- o in tr mt chiu: Cuo TO-USA nhit 200C - Cun dy 23KV:ab: 45,9m; bc: 45,7m; ca: 46,0m. - Cun dy 115KV (): PhaAnBnCn 0,210,210,211 - Cun dy 225KV (): Gi tr o t nc 1 cho n nc 19 in trcc pha An, Bn, Cn trong khong t 0,49 n 0,561. 4- o tg cun dy: Cun dy Tg C(nF)Loi s Cun 220+110KV0,2415,08GSTA+B Cun 23KV0,2616,62GSTA+B 5- o tg s u vo: S 220KV Tg(%) C(PF)Loi s A0,26375 B0,26371,6 C0,25373,8 USTA S 110KV Tg(%) C(PF)Loi s A0,24301,0 B0,23304,4 C0,22301,1 N0,24311,5 USTA 6- o t s bin: - Cun 225KV v cun 23KV ( c o t nc 1 cho n nc 19). - Cun 225KV v cun 115KV ( c o t nc 1 cho n nc 19). - Cun 115KV v cun 23KV ( c o t nc 1 cho n nc 19). 7- Kim ra th vng:- T nc 10 v nc 9 b chuyn nc lm vic 24 vng 3/4. Ht c/trnh 33 v. - T nc 9 ln nc 10: B chuyn nc lm vic 24vng 3/4. Ht chu trnh 33 v. 8- Kim tra t u udy: Y0/Yo/ -11 ( ng nh nh ch to) 9- Th nghim du cch in: TT Mu xc Cc bon t do H20 t do Tp cht c hc Uxt (KV) Axitho tan TrsAxit mgKOH/gdu Chp chy kn Tg% 900C m ppm 1Trng trong sut 00073 Trung tnh 0,0171420,38,1 9- Thit b th nghim: - Cuo t s bin: TTR, Cu o tang TETTEX - Mgm ISOL 5003, Cu o in tr mt chiu: TO USA Ti liu Bi hun Vn hnhTrm 220KV Sc Sn ---------------------------------------------------------------------------------------------------------------------------------------- ------------------------------------------------------------------------------------------------------mr.nam e1.19ss ---- 29Cu 12: Kh nng qu ti ca MBA.

TutheocciukinvnhnhcaMBAnh mc d phng cng sut MBA, th ph ti v nhit mi trng. i vi tt c MBA c th cho php lm vic trong tnh trng qu ti, gi l qu ti s c. Ty thuc vo nhit mi trng, v tr t my mc qu ti s c, th gian lm vic cho php theo cc mc sau y: Qu ti v I so vi Im (%) 305075100200 Thi gian qu ti (pht) 1204520101,5 chqutisc,MBAcphpvtqutinhmcti40% trongthigiantiakhngqu6gitnhchungtrong1ngym,nhng khng c qu 6 ngy m. Trong mi trng hp khng c nhit du lp trn ca MBA vt qu mc quy nh. Qutibnhthng(gilqutichthngtytheobiuphti ngy m v mc non ti ca MBA cc ma trong nm, cho php cc MBA lm vic qu ti bnh thng. Do c thi gian MBA mang ph ti thp hn ph ti nh mc, nn c th cho php my lm vic qu ti c h thng tc thi. Mc qu ti c h thng tc thi c xc nh ty theo nhit nng ca cclpdubntrnngaytrckhichoMBAmangphnphtitngthm trong trng hp ny khi kt thc qu trnh qu ti, mc chnh lch nhit qu nng ca cc phn ca MBA khng oc qa gii hn tiu chun. Nu trong nmc nhng ma m MBA lm vic non ti th trong nhng ma khc, MBA cng c th c php lm vic qu ti C th cho MBA lm vic qu ti ng thi theo c hai iu kin ni trn, nhngmcqutikhngcvtqu30%.Trongmitrnghpkhng uc nhit du lp trn my vt qu qui nh. Ti liu Bi hun Vn hnhTrm 220KV Sc Sn ---------------------------------------------------------------------------------------------------------------------------------------- ------------------------------------------------------------------------------------------------------mr.nam e1.19ss ---- 30Cu13: iu kin vn hnh song song 2 MBA. Hai MBA lm vic song song tt nht l in p th cp ca chng bng nhau v tr s, trng v gc pha v ti c phn phi t l nh nhau. Mun vy phi c cc iu kin sau: - Cng t ni dy. - Cng h s bin i in p k. - Cng in p ngn mch Un. 1. iu kin cng t u dy: - C cng t u dy th in p th cp s trng pha nhau. -Khcnhautudythinpthcplchphanhau.Gclchpha ny do t ni dy quyt nh. V d:MBA I:Y/ - 11 v MBA II:Y/ - 12 in p th cp lch pha nhau 300 Trong mch ni trn dy qun th cpca 2 MBA s xut hin s.E= 2Esin15 = 0,518E2 Dng in khng cn bng chy trong hai my lc : Icb = nII nI Z ZE+

Gi s ZnI + ZnII = 0,05 th Icb = 05 , 0 05 , 0518 , 0+ = 5,18. Dngnygphn5lndngnhmccthgyrascinngln lm nngv hng MBA. Nh vy 2 MBA lm vic song song phi cng t ni dy. 2. iu kin cng t s bin i in p k bng nhau: Nutsbinbngnhaukhilmvicsongsong,inpthcplc khngtibngnhauE2I =E2II.TrongmchthcpcaMBAkhngcdng in. GiskkhcnhauthE2I E2IIngaykhikhngtitrongdyqunth cp ca cc MBA c dng in khng cn bng sinh ra bi E = E2I - E2II. Dng in chy trong dy qun ca cc MBA theo chiu ngc nhau. V d: E2I > E2II tc l K1 > K2 U1 ax i ii U2 xa icbiii cb i e 2II e2I300 e 0 e Ti liu Bi hun Vn hnhTrm 220KV Sc Sn ---------------------------------------------------------------------------------------------------------------------------------------- ------------------------------------------------------------------------------------------------------mr.nam e1.19ss ---- 31 a) th vc t khi khng ti b) S phn phi ti ca cc MBAkhi lm vic c k khc nhau MBA I t X - AMBA II t a - x Chm pha nhau 900, in p ri trn cc dy qun MBA do dng in cn bng sinh ra s b tr cc in p E2I ,E2II v kt qu mch th cp c in p U2. KhictidngincnbngIcbscngvoItlmchohstikhc nhau(bnhthngphibngnhau)nhhngxunviclidngcngsut ca my bin p.V vy, quy nh k ca cc MBa lm vic song song khng ln qu 0,5% tr s trung bnh ca chng. 3. iu kin tr s in p ngn mch Un bng nhau: TrsUnclinquantrctipnsphnphitigiaccMBAlm vic song song. Xt s lm vic song song ca 3 my bin p c UnI , UnII , UnIII b qua t ha. Z = ==+ +IIII ininIII nII nIZ1Z1Z1Z11 v Zn = UndmdmIU E2I I nI - IcbI InII-IcbII E2IIIcbIIcbII U2U2 IcbIIcbII I2II ItI - ItIII2IZnI-I'2I ZnIIZnIII-I'2III U2U1I1 I'2 UTi liu Bi hun Vn hnhTrm 220KV Sc Sn ---------------------------------------------------------------------------------------------------------------------------------------- ------------------------------------------------------------------------------------------------------mr.nam e1.19ss ---- 32h s qu ti I = =nidminIdmI1USUSSS; II = =nidminIIdmIIUSUSSS2 ; III = =nidminIIdmIII3USUSSS I : II : III= nI U1 = nII U1 = nIII U1 NuUnbngnhauthbngnhau,tisphnphiutheocngsut. NuUnkhcnhauthMBAnocUnnhthln(mangtiln).Cnmy bin p c Un ln th nh (mang ti nh). Khi my bin p c Un nh lm vic n nh mc th MBA c Un ln vn non ti. Nh vy khng tn dng ht cng sut MBA thit k. Thng thng MBA c cng sut ln th Un nh. MBA c cng sut ln thUnln.Vthcngsutqukhcnhauthlmvicsongsongcngkhng c li. Cho nn Un ca cc MBA lm vic song song khng khc nhau qu 10%. Ti liu Bi hun Vn hnhTrm 220KV Sc Sn ---------------------------------------------------------------------------------------------------------------------------------------- ------------------------------------------------------------------------------------------------------mr.nam e1.19ss ---- 33Cu 14: T u dy ca MBA. T u dy ca MBA c hnh thnh do s phi hp kiu ni dy s cp vikiunithcp.Nbiuthgclchphagiascinngcundys cp v th cp ca MBA. Gc lch ny ph thuc vo cc yu t sau y: - Chiu qun dy. - Cch k hiu cc u dy. - Kiu u dy qun s cp v th cp. Xt MBA 1 pha c 2 dy qun s cp v th cp AX, ax nh sau: Nu c 2 dy qun c qun cng chiu trn tr thp, k hiu cc u dy A, X phatrn.a,xphadi(ha)thscmngtrongchngkhictthng bin thin i qua s hon ton trng pha nhau t u cui n u u (h b). Khi i chiu qun dy ca 1 trong 2 dy qun, v d ca dy qun th cp ax (hnh c) th s trong chng s ngc pha nhau.Trng hp th nht, gc lch pha gia cc s k t vc t s s cp n vc t s th cp theo chiu kim ng h bng 3600, hai trng hp sau l 1800. MBA 3 pha cn do cch u dy qun hnh Y hay vi th t khc nhau m gc lch pha gia cc s dy s cp v th cp c th l 300, 600, 900..., 3600. Thc t, thun tin ngi ta khng dng "" ch gc lch pha m dng phng php kim ng h biu th v gi tn t ni dy ca MBA. Cc biu th nh sau: Kim di ca kim ng h ch s dy s cp t c nh con s 12, kim ngn ch s dy th cp t tng ng cc s 1, 2, ..., 12 tu theo gc lchphagiachngl300,600,...3600.Vicchbiuthny,iviMBA1 pha trong v d trn, trng hp th nht s thuc t ni dy I/I-12, v gc lch pha gia 2 s l 3600, hai trng hp sau thuc t ni dyI/I-6. V gc lch pha l 1800. (K hiu I dng cho MBA 1 pha). i vi MBA 3p, ta c 12 t ni dy. V d 1 MBA 3 pha c 2 dy qun ni hnh sao cng chiu qun dy v cng k hiu u dy (hnh g) th hnh sao s pha gia 2 dy qun hon ton trng pha aXaxaa1800xxhnh c hnh da aX a x x x a 3600 hnh ahnh baXaxa1800x x hnh ehnh fTi liu Bi hun Vn hnhTrm 220KV Sc Sn ---------------------------------------------------------------------------------------------------------------------------------------- ------------------------------------------------------------------------------------------------------mr.nam e1.19ss ---- 34nhau theo chiu kim ng h v gc lch pha gia hai in p dy s bng 3600. Ta ni MBA thuc t u dy 12 v k hiu Y/Y-12. Nu i chiu qun dy th cphayikhiuudycadyqun thcptaccctnidyY/Y-6. Hon v th t cc pha th cp, ta s c cc t ni dy chn 2, 4, 6, 8, 10. CngviMBAnhtrn,khidyqunutheosY/nhhnhi,thgc lch pha gia in p dy s cp v th cp l 3300. MBA thuc t ni dy Y/-11. Thay i chiu dy qun hay i k hiu u dy ca dy qun th cp, ta c t ni dy Y/-5. Hon v cc pha th cp ta sc c cc t ni dy l 1, 3, 5, 7, 9. Sn xut nhiu MBA c t ni dy khc nhau s bt tin cho vic ch to v s dng, v th ngi ta ch sn xut cc MBA in lc thuc cc t ni dy: Y/Y0-12, Y/-11, Y0/-11. EAB Eab3600 hnhh CABC XY Z abc xyz EAB B A Eab cb a hnh gY ZXyxzAB C XYZ abc xy z EAB CB A Eab cb a X Y Z xy z hnhi EAB Eab3600 EAB Eab3300 hnhk Ti liu Bi hun Vn hnhTrm 220KV Sc Sn ---------------------------------------------------------------------------------------------------------------------------------------- ------------------------------------------------------------------------------------------------------mr.nam e1.19ss ---- 35Cu 15: Du MBA. Cng dng: - Du MBA dng lp kn cc l xp ca vt liu cch in si, lp kn cc khong trng gia cc cun dy, gia cun dy vi v lm tng kh nng cch in ca cc vt liu. - Lm mt cc cun dy v li t. - trong cc MC in, du MBA c tc dng dp tt h quang. Tiu chun k thut: -nht:nhtcaduMBAquynhl1,8E(Engler),nu nht ln qu th tc dng lm lnh km. - im chp chy: Du MBA quy nh l +1350 C (im chy l +1650 C). - Tn hao mi cht: Vi tn s 50 Hz v nhit -200 C quy nhTg