LI M UTrm bin p trung gian ng vai tr rt quan trng trong h thng nnglng. Do s pht trin mnh m ca h thng nng lng in quc gia, dn n ngy cng xut hin nhiu nh my in v trm bin p c cng sut ln.Vic gii quyt ng n cc vn kinh t - k thut trong thit k, xy dng v vn hnh chng s mang li li ch khng nh i vi nn kinh t quc dn ni chung v i vi ngnh in cng nghip ni ring. m bo cho vic cung cp in c tt i hi phi xy dng c mt h thng in gm cc khu sn xut, truyn ti v phn phi in nng hot ng mt cch thng nht vi nhau. Trong trm bin p tiu th (phn phi) ng vai tr rt quan trng v muntruyn ti in nng i xa hoc gim in p xung thp cho ph hp ni tiu th ta dng trm bin p l kinh t v thun tin nht .C rt nhiu trm bin p c xy dng rt nhiu ni trn mi min t nc Vit Nam, trong c rt nhiu trm bin p tiu th (phn phi). Vi n Nghin cu trm bin p tiu th 560kVA-35/0,4kV ca cng ty LM-VINA em mong mun s tm hiu, nghin cu su hn v trm bin p tiu th, cch vn hnh, qun l trm, nm r cc trang thit b trong trm.Trong qu trnh lm n em nhn c rt nhiu s gip tn tnh ca thy gio hng dn Th.S Nguyn Xun Hiu v cc thy c trong b mn cng cc bn b gip em hon thnh bn n. Em xin chn thnh cm n cc thy c v cc bn nhit tnh gip em!

NI DUNG BN N GM 4 CHNGChng I: Tng quan v trm bin p tiu thChng II: Cc thit b trong trm bin p tiu thChng III: Trm bin p 560kVA-35/0,4kV ca cng tyLM- VINAChng IV: Ti liu tham kho (ti liu tham kho ch l ph lc ch ko phi chng nh)

Chng I: Tng quan trm bin p tiu th1.1 Khi qut v trm bin p tiu th1.1.1. Tng quan v trm bin pNi dung trnh by trong phn ny cha thc s ph hp vi tiu ca mc 1.1.1Trm bin p dng bin i in p t cp in p ny sang cp in p khc. Cng sut ca my bin p , v tr, s lng v phng thc vn hnh ca trm bin p c nh hng rt ln n cc ch tiu kinh t - k thut ca h thng cung cp in. V vy vic chn cc trm bin p bao gi cng phi gn lin vi vic la chn phng n cung cp in. Dung lng v cc tham s khc ca my bin p ph thuc vo ph ti ca n, vo cp in p ca mng, vo phng thc vn hnh ca trm bin p vv V th la chn c trm bin p tt nht, chng ta phi xt n nhiu mt v phi tin hnh tnh ton so snh kinh t k thut cc phng n ra .Hin nay nc ta ang s dng cc cp in p sau y: Cp cao p: 500 kV dng cho h thng in quc gia ni lin ba min Bc , Trung , Nam . 220 kV dng cho mng in khu vc. 110 kV dng cho mng phn phi, cung cp cho cc ph ti ln . Cp trung p: 35kV, 22 kV, 10kV, 6kV dng cho mng in a phng , cung cp cho cc nh my va v nh, cung cp cho cc khu dn c. Cp h p: 380/220V dng trong mng h p . Trung tnh trc tip ni tDo lch s li hin nay nc ta cp trung p vn cn dng 66kV, 35kV, 15kV, 10kV v 6kV . Nhng trong tng lai cc cp in p nu trn s c ci to dng thng nht cp 22kV.1.1.2. Chc nng ca trm bin p tiu thTrm bin p tiu th c s dng nhiu trong cc khu dn c, chung c v ti nh c, cc trm cp ngun cho cc doanh nghip v xng sn xut nh v cn l cc trm cp ngun thi cng lu ng rt hiu qu v thun li .m bo vn hnh lin tc v an ton cung cp in. Mun tha mn c yu cu ny, trong trng hp x nghip c hai trm bin p tr ln ta c th s dng cu dao lin lc gia hai thanh ci th cp ca cc trm vi nhau.Trng hp ch c mt trm th ngi ta thng b tr thm mt my bin p d tr thay th my bin p chnh khi cn thit.Qua cc trm trung gian in nng c truyn n cc h tiu th in. tin cy cung cp in ca h tiu th c m bo bng li in thch hp, c ng dy d tr. Ngun cung cp ni t cc phn on khc nhau ca trm bin p hoc t hai ngun in c lp nh trm bin p hoc nh my in.Trm bin p tiu th l trm h p.V phng din cng sut, trm bin p cung cp in cho ph ti loi 1 nn dng hai my bin p.V d khi trm bin p cung cp in cho mt phn xng th khi ph ti loi 1 b hn 50% tng cng sut ca phn xng th t nht mt my phi c dung lng bng 50% cng sut ca phn xng . Khi ph ti loi 1ln hn 50% tng cng sut ca phn xng th t nht mt my phi c dung lng bng 100% cng sut ca phn xng . ch bnh thng c 2 my bin p lm vic, cn trong trng hp s c mt my th ta s chuyn ton b ph ti v my khng s c; khi ta phi s dng kh nng qu ti ca my bin p hoc ta s phi ngt cc h tiu th khng quan trng. Nu ch c h tiu th loi 3 hoc loi 2 th ta c th trang b ch mt my bin p cho trm v s dng ng dy ph ni h p ly t mt trm in khc ca x nghip nu thy cn thit.1.1.3. Nhim v ca trm bin p tiu th- Trm bin p tiu th lm nhim v bin i cc cp in p cao hn thnh cp in p ph hp vi nhu cu s dng, sn xut.- Trm bin p tiu th thng l trm h p, h cp in p cao xung cp in p thp.- cc pha cao v h p ca trm bin p thng c cc thit b phn phi tng ng thit b phn phi cao p v h p. Thit b phn phi c nhim v nhn in nng t mt s ngun cung cp v phn phi i cc ph ti qua cc ng dy ti in. Trong thit b phn phi c cc kh c in ng ct, iu khin bo v v o lng.Phn chc nng v phn nhim v ca trm bin p tiu th nn nhp vo 1 mc duy nht thi, ch : chc nng ca trm bin p gm 2 chc nng chnh: Cp in Bin i in pT 2 trn, em thu thp ti liu, vit thm pht trin .II. Phn loi trm bin pPhn loi trm bin p ph thuc vo mc ch c th phn loi theo cccch sau :1. Theo nhim v ca trm bin p ta c th chia thnh trm bin p tng p v trm bin p gim p : Trm bin p tng p l trm bin p c in p th cp ln hn in p s cp. y thng l trm bin p ca cc nh my in, cc trm bin p ny tp trung in nng ca cc my pht in cung cp nng lng cho h thng in v ph ti xa . Trm bin p h p l trm bin p c in p th cp thp hn in p s cp. y thng l trm bin p c nhim v nhn in nng t h thng in phn phi cho ph ti.2. Theo chc nng c th chia thnh trm bin p trung gian v trm bin p phn phi :Trm bin p c cng sut ln lm nhim v bin i cho mt hoc nhiu trm bin p cp in hoc phn phi ln li quc gia hoc ngc li t li quc gia xung.Trm bin p trung gian lm g???Trm bin p phn phi hay cn gi l trm bin p a phng c nhim v phn phi trc tip cho cc h s dng in ca x nghip, khu dn c, trng hc thng c cp in p nh ( 10, 6, 0,4 kV ).3. Theo hnh thc v cu trc ca trm ngi ta chia thnh trm ngoi tri v trm trong nh :a. Trm bin p ngoi tri: y cc thit b nh dao cch ly, my ct, my bin p, thanh gp u t ngoi tri. Ring phn phn phi in p thp th t trong nh, hoc t trong cc t st ch to sn chuyn dng phn phi phn h th. Loi ny thch hp cho cc trm trung gian cng sut ln, c t ai cn thit t cc thit b ngoi tri. S dng loi trm t ngoi tri s tit kim c kh ln v kinh ph xy dng hn trm t trong nh. Vi loi trm ny c cc kiu trm thng c dng l: Trm treo (mi loi trm nn c nh s mc cho d theo di)L trm m ton b cc thit b h p, my bin p c treo trn ct. My bin p thng l my bin p 1 pha hoc l t my 3 my bin p 1 pha, tut h p c t trn ct.Trm ny rt tit kim t nn thng c dng lm trm cung cp in cho mt vng dn c, my bin p ca trm c cng sut nh, cp in p 15kV, 22kV,35kV, phn o m c trang b pha h p.V tr lp t: L trm m ton b cc thit b cao h p v my bin p u c treo trn ct.Dung lng cng sut khong t 25 n 630kVA, c trng lng t 300 n 1800kg.Cp in p 15,22,35kV/0,4kVPhn o m c trang b pha h p, l loi trm h nn c h s an ton thp.T h p c lp t ngay trn ct.y l loi trm b gii hn v cng sut nn cng sut cho php ch t 630kVA tr xung.Trn thc t c rt nhiu trm bin p kiu treo c hnh dng v kch thc khc nhau: kiu trm treo c 1,2 hoc 3 my bin p 1 pha hoc 1 my bin p 3 pha, cc my bin p u c lp t ngay trn ct. (Kim tra li s lng MBA trn ct ca trm treo!!!)+Trm bin p c 1 my bin p 1 pha

Hnh v hay nh minh ha cn c ghi tn, v nh s theo quy nh!!!Hnh v nn c t gia trang.y l kiu trm bin p 1 pha, my bin p c dng hnh tr, trn my c mt u vo cao p v 4 u ra h p

+ Trm bin p c 3 my bin p 1 pha:

Trm gm c 3 my bin p 1 pha, c ni vi nhau to thnh 1 trm bin p 3 pha vi 3 u vo cao p v 4 u ra ha p. Pha u h p ca cc my bin p c mc sao tam gic, dy dn ni t pha h p c i lun trong ng, i dc theo thn ct xung t in. S trm treo 3 my bin p 1 pha:

Pha cao p ca trm gm c cc thit b: dao ph ti, chng st van, cu ch t ri.Pha h p gm c t tng v t t b cng sut.+ Trm bin p c 1 my bin p 3 pha:Trm gm 1 my bin p 3 pha, c treo gia hai ct, my bin p c 3 ty s cao p v 4 u ra h p. Day dn pha h p dng bng dy cp, i trong ng nha do.

T h p c thit k ngya bn di my bin p, c treo gia 2 ct song song vi my bin p, t t b cng sut treo pha bn ctCu trc ca trm bin p treo:+ ng dy trn khng 35kV+ Cu dao lin ng 35kV/630A+ Chng st van 35kV+ Cu ch t ri+ Thanh ci+ My bin p+ Chp cc my bin p+ T in+ H thng ni t trm Trm gin (trm ny c g khc trm trn)Trm gin l loi trm m ton b cc trang thit b v my bin p u c t trn cc gi bt gia hai ct. Trm c trang b ba my bin p mt pha ( 3 x 75 kVA) hay mt my bin p ba pha( 400 kVA), cp in p 15 22 kV /0,4 kV.

Phn o m c th thc hin pha trung p hay pha h p. T phn phi h p t trn gin gia hai ct ng dy n c th l ng dy trn khng hay ng cp ngm.My bin p ca trm c 3 u vo cp cao p v 4 u ra cp h p. Phn h p ca my bin p c dng bng dy cp ni vi t h thTrm gin thng cung cp in cho khu dn c hay cc phn xng.

Trm nn Trm nn thng c dng nhng ni c iu kin t ai nh vng nng thn, c quan, x nghip nh v va.Tt c cc thit b cao p c lp trn ct, t in, my bin p u c xy dng, lp t trn nn b tng xi mng.

Xung quanh trm c xy tng ro bo v. ng dy n c th l cp ngm hay ng dy trn khng, phn o m c th thc hin pha trung p hay pha h p.V tr lp t (cch thc lp t?): thit b cao p c t trn ct, my bin p c t trn b xi mng di t v t phn phi h p c t trong nh. Pha cao p c ni vo 3 u s cao p ca my bin p, pha h p c dng dy cp i ngm di t

Cc thit b ca trm gm c: dao cch ly, cu ch t ri, chng st van, thanh ci, cu dao lin ng. T in ca trm c chia lm 2 ngn. Ngn bn tri gm c ptomat tng v cc ptomat l ra, thanh ci tng chung. Ngn bn phi c lp t cc thit b o lng, vnmet, ampemet, ng h o cos phi, ng h o nhit .Cp in p: 35kV, 22kV, 15kV, 19kV,6kVDung lng cng sut: 560kvA, 630kVA Trm hp bV tr lp t: trm c lp t, xy dng ngoi tri, nhng ni khng gian cht hp, hn ch v din tch. Tt c cc thit b cao p, h p, my bin p c t trong t kn, lm mt bng qut cng bc hoc lm mt bng gi t nhin.Trm c thit k chia lm 3 khoang: khoang cao th, khoang my bin p v khoang h th

+ Khoang cao th c t bn tri, Tiu chun p dng: IEC 60 265, IEC 60 298, IEC 60 694. in p nh mc: n 35kV.Trong khoang gm c: T hp b mch vng RMU 24kV, 630A, 20kA/s, cch in kh SF6, 2 l vo, mt l sang my bin p. Bo v my bin p bng cu ch.+ Khoang my bin p: Tiu chun p dng: IEC 60 076in p nh mc pha cao th: n 35kVin p nh mc pha h th: 400VTn s nh mc: 50HzCng sut my bin p: n 1250kVA+ Khoang h p:Tiu chun p dng: IEC 60 439in p nh mc: 400VDng in nh mc: n 2000ATrong khoang gm 2 ngn nh: ngn chng tn tht (ng h, bin dng, n bo), ngn thit b ng ct (ACB hoc MCCB tng, MCCB nhnh, chng st van).Cp in p :+ in p pha s cp 35kV,22kV,15kV+ in p pha th cp: 0,4kVDung lng cng sut: 250kVA - 2000kVATiu chun ch to : IEEE C 57.12.26Tn s: 50HzS ni in ca trm hp b.

Cc b phn chnh ca trm gm c:+ u ni cp ngm loi ct ti hay khng ct ti: u cp dc c, c th chu nc, thch hp cho vic lp trong nh hoc ngoi tri. Dng lin tc 1250A i vi cp 22kV v 630A i vi cp 35kV. Chu c dng ngn mch n 75kA trong 1 giy. Chu ng p xung n 170kV+ S xuyn my bin loi ct ti hoc khng ct ti: Thit k i vi loi khng cho php ct ti c s dng vi thit b ngm trong du. Bao gm lp mn bc kim sot ng sut intrng vi bn tip a. c ch to cho cc ng dng ngoi tri v trong nh.+ Dao ct c ti v mch vng: S dng 3 v tr khc nhau nh ngun, m v ng tip a. Cc tip im lm bng ng, m bc.+ Dao ct c ti my bin p: C cu c kh vn hnh theo nguyn tc l xo m bo thi gian thao tc ng/ct khng qu 1 chu k. Yu cu lc tc ng momen l t nht+ Cu ch hn dng bo v my bin p: L cu ch dng cao, kt hp vi Magnes Interrupter bo v cho my bin p. Bo v v cch ly thit b b s c, c kh nng hn ch hiu qu nng lng sinh ra do ngn mch.+ Thit b bo v mng qu ti: l thit b bo v qu dng, tc ng ct 3 pha cng 1 lc. Bo v khi h hng do qu ti, s c pha th cp v do nhit du bin th cao.C th reset bn ngoi, c th c s dng ng ct my bin p.+ Chng st van loi ngm trong du: C th c s dng ng ct my bin p. Kh nng bo v u vit vi in tr phi tuyn bng vt liu oxit kim loi. Loi b kh nng rt ngn tui th vn hnh ca chng st do cc tc nhn bn ngoi, ng vt, hnh ng ph hoi hay m thp xm nhp.+ Dao cch ly chng st: Thit b bn ngoi cho php cch ly v ti lp chng st phc vcho vic th nghim my bin p+ B ch th ng dy ti in: Cho bit tnh trng mang in ca ng dy, hin th qua n LED, c lp v bc chu c thi tit. c s dng vi u ni cp ngm c v tr kimtra in p.+ B ch th s c: Xc nh khu vc cp b s c, p dng cng ngh c th thay i gi tr ct. Cu trc chc chn v bn - chu c ph hoi v chng n mn.b. Trm bin p trong nh: y cc thit b c t trong nh. Loi trm ny hay thng gp cc trm phn xng hoc cc trm bin p ca cc khu vc trong thnh ph. Loi trm trong nh thng c s dng theo cc kiu trm sau:

Trm kn(V tr lp t?) Trm kn l loi trm m cc thit b in v my bin p c t trong nh.Trm kn thng c phn lm trm cng cng v trm khch hng.Trm cng cng thng c t khu th ha,khu dn c mi m bo m quan v an ton cho ngi s dng.Trm khch hng thng c t trong khun vin ca khch hng khuynh hng hin nay l s dng b mch vng chnh (Ring Main Unit) thay cho kt cu thanh ci, cu dao, c b ch v cu ch ng bo v my bin p c cng sut nh hn 1000 kVA.

My bin p c t trong nh, my thng c lm mt bng du ONAN phn s cao p ca my bin p c ni bng cp, cp c i ngm di nn t

i vi loi trm kiu ny cp vo v ra thng l cp ngm .Cc ca thng gi u phi c li phng chim ,rn ,chut v c h du s c.Cc thit b trong t gm c: cu dao lin ng, cu ch t ri, dao cch ly, thanh ci.Phn bo v trm gm c my ct, cu dao, cu ch, ptomastPhn h thng o lng gm ng h o in, ampemet, ng h o cos phi, nhit k.V tr lp t (Cch thc lp t?): tt c cc thit b in v my bin p u c t trong nh.Dung lng cng sut: cc my bin p c cng sut nh hn 1000kVACp in p nh mc l 35kV (cao p?, h p?) Trm trn b (loi ny c phi l loi trm hp b trnh by trn khng?)yang l loi trmang rtc s dng rt nhiu trong cc ta nh trong th nh thit k nh gn, khng qu cng knh nh loi trm ngoi trii vi nhiu trm phc tp i hi s dng cu trc ni mng ngun kiu vng hoc t ng ct cha nhiu my ct,gn, khng chu nh hng ca thi tit v chu c va p, trong nhng trng hp ny cc trm trn b kiu kn c s dng .Cc khi c ch to sn s c lp t trn nn nh b tng v c s dng i vi trm th cng nh trm nng thnMy bin p, t ng ct trung p v t ng ct h p c t trong trm, v ca trm thng c lm bng st, sn chng r, c h thng tn nhit bng qut gi, hoc thong.T ng ct trung p c lm bng tn dy khong 2mm

gm c cu dao, cu ch cao p, my ct, cc ptomat, t in, thanh ci, ng h ch th dng in.T ng ct h p c lm bng tn dy khong 2mm.

cc thit b trong t gm c ptomat, thanh dn.+ Cc u im ca trm kiu ny l: Ti u ha v vt liu v s an ton do c s chn la thch hp t cc kiu lp t c th.+ Tun theo ton b cc tiu chun quc t hin hnh v cc tiu chun d nh trong tng lai+ n gin ha trong thi cng, ch cn cung cp mt mng bng b tng chu lc+ V cng n gin trong lp t thit b v kt ni.+ Cc trm kiu ny chc chn, gn p thng c dng cc ni quan trng nh c quan ngoi giao,vn phng, khch sn.V tr lp t ca trm: trm c xy dng thit k t trn nn b tng, my bin p v cc thit b in c lt t trong t kn.Cng sut ca trm c dung lng t 25-10000kVA vi cc cp in p l 35kV,22kV,15kV,10kV.Ngoi ra v iu kin chin tranh, ngi ta cn xy dng nhng trm bin p ngm, loi ny kinh ph xy dng kh tn km .Cc s u dy ca trm bin p (phn ny thiu nhiu)Phn trnh by phn loi trm bin p thiu phn loi trm bin p theo v tr t so vi phn xng: 3 v tr-Ngoi phn xng-K phn xng-Trong phn xngEm da vo gi ny trnh by thm!!!

CHNG II: Cc thit b trong trm bin p tiu th

I. S ni in1. S trm bin p trung tmCh nhng x nghip c quy m ln mi cn xy dng trm bin p trung tm. Nhng x nghip ny c ngha rt quan trng v kinh t, khng th mt in. Trng hp ny c cng sut rt ln, nu d phng bng my pht s khng c li bng cch cp in bng hai ng dy trung p. V th trm phn phi trung tm nn dng s mt h thng thanh gp c phn on ( hnh 2.6)

Hnh 2.6a 2.6bHnh 2.6a l s nguyn l trm bin p phn phi (tiu th) s dng cc t my ct cn gi l t hp b, trn tt c cc u vo u ra v lin lc gia 2 phn on thanh gp. T trm bin p trung gian ti x nghip c th dng dy trn khng hoc cp. Nu dng ng dy trn khng th tren mi phn on thanh gp ca trm cn t thm mt chng st van. Vi in p trung p l 22kV (h thng c trung tnh ni t trc tip) t bin p o lng 2 cun dy trn mi phn on thanh gp vi in p trung p l 35kV, 10kV,6kV phi t trn mi phn on thanh gp mt my bin p o lng c 3 cun dy, trong cun tam gic h dng pht hin dng chm t mt pha.Hnh 2.6b l s nguyn l trm phn phi, trn mch vo v phn on dng my ct hp b, cc mch ra dng dao ct ph ti phi hp vi cu ch ( cn gi l my ct ph ti). My ct hp b th lm vic an ton v tin cy hn my ct ph ti nhng cn vn u t ln hn.S trm bin p c 1 v 2 my bin p:Hnh 2.7: S trm bin p 1 v 2 mya,c: pha cao p t dao cch ly; b,d: pha cao p t dao cch ly-cu ch ; e,f: pha cao p t my ct Ty theo mc quan trng ca c quan, x nghip m t 1 hay 2 my bin p trong mt trm. Ty theo iu kin, pha cao p trm c th t dao cch ly, cu ch-dao cch ly. Hnh 2.7 gii thiu mt s s in hnh cc trm bin p phn xng hoc trm bin p x nghip nh. Nu pha cao p trm c cp in bng ng dy trn khng th phi t chng st van. Pha h p nu i n ph ti bng ng dy trn khng th cng phi t chng st van h p. Trong x nghip, cc trm bin p phn xng thng l trm xy kn, thch hp vi cc loi s trn, nhng nu l trm treo hoc trm ct th cng c th dng cu ch t ri thay cho b cu dao cch ly cu ch. Vic t my ct pha cao p ch dng cho trm bin p cng sut ln xa ngun.Mc 2 u? Cc phn t chnh trong trm bin p tiu th+ My ct+ My ct ph ti+ Cu dao cch ly+ Cu ch+ My bin dng+ My bin p o lng+ R le My ct (kim tra xem trm bin p c dng my ct hay khng, nu dng th dng loi no?)- My ct in, k hiu MC, l thit b ng ct mch in p cao (trn 1000V). Ngoi nhim v ng, ct in ph ti phc v cho cng tc vn hnh, my ct cn c chc nng ct dng in ngn mch bo v cc phn t ca h thng cung cp in.- My ct cng c ch to nhiu chng loi, nhiu kiu cch, mu m. C my ct t du, my ct nhiu du, my ct khng kh, my ct chn khng, my ct kh SF6.+ My ct in du:

y l my ct in CBM c in p nh mc l 66kV, dng ng ct mch in cao p, trn my ct c cc ty s cao p c ni vi ng dy cao p.+ My ct khng kh: mi my ct khng kh u c bnh khng kh d tr c cung cp t thit b nn kh chung, khi ng my ct in th van ng c m ra, khng kh nn c tc ng ln mt di ca pt tng, y pt tng i ln, hai u tip xc ng li. Khi ct mch th van ct c m ra, khng kh nn tc ng ln mt trn ca pt tng, y pt tng i xung v ct mch, h quang pht sinh c dp tt bng kh nn.

y l my ct khng kh ACB c xut x t trung quc. My ct ny c kh nng ct dng ngn mch xoay chiu t 80kA n 120kA+ My ct chn khngch to vi in p t 7,2 n36KV, dng in n mc l 5000A, dng ct l t 60 n 80kA. Cc tip im t trong chn khng c p sut t 10-7 n 10-11 bar. m 2 u tip xc 5 n 25mm. Thi gian phc hi bn nhanh t 4 n 6s

y l my ct chn khng cao th ZN-28 series. My ct ZN-28 series l thit b phn phi in cao th trong nh 3 pha AC 50Hz vi in p danh nh 12kV hoc nh hn. My ct ny ph hp trong iu khin v bo v h thng phn phi v truyn ti in, nh trm in c bit c s dng ti nhng khu vc hot ng lin tc.Cc thng s ca my ct ZN 28 series:in p danh nh: 12kVDng in danh nh: 1250, 1600, 2000, 2500 v 3150ADng ct ngn mch danh nh: 20, 25, 31.5 v 40kADng to ngn mch danh nh: 50, 63, 80 v 100kAThi gian ngn mch danh nh: 4 giyChu k hot ng ti dng ct ngn mch danh nh: 30 ln bn c hc: 10.000 lnThi gian ng: U2) gi l my bin p gim p.My bin p c k < 1 (U1 < U2) gi l my bin p tng p.Nu b qua tn hao cng sut trong my bin p th S1 = S2, v ta c:U1.I1 = U2.I2 v U1/U2 = I2/I1 = kCch la chn v kim tra my bin p:+ Khi la chn my bin p bao gm la chn s lng, cng sut, chng loi, kiu cch v cc tnh nng khc ca my bin p.+ S lng bin p t trong mt trm ph thuc vo tin cy cung cp in cho ph ti trm .+ Vi ph ti quan trng khng c php mt in, phi t hai bin p.+ Vi cc x nghip hng tiu dng, khch sn, siu th (h loi 2) thng t mt my bin p cng vi my pht d phng .+ Vi cc h nh sng sinh hat thng ch t mt trm my.+ Cng sut my bin p c la chn theo cc cng thc sau :vi trm mt my SmB Sttvi trm hai my SmB

Trong : SmB cng sut nh mc ca my bin p, nh ch to cho.Stt: cng sut tnh ton, ngha l cng sut ln nht ca ph ti1,4: h s qu ti Kqt Cch la chn bin in p:S u dy v kiu bin in phi ph hp vi nhim v ca n. cung cp cho cng t ch cn 2 my bin in p 1 pha. Nu ng thi dng bin in p kim tra cch in ca mng 3 pha trung tnh cch in 3-20kV dng bin in p 3 pha 5 tr ni theo kiu sao-sao-tam gicMng 35kV tr ln ngi ta dng 3 my bin in 1 pha ni theo kiu sao sao tam gicin p ca my bin in p nh mc phi ph hp vi in p ca mng.Cp chnh xc phi la chn ph hp vi in p la chn.Cng sut nh mc: Tng ph ti ni vo bin in p phi nh hn hoc bng cng sut nh mc ca bin in p vi cp chnh xc chn.Chn dy dn gia bin in p v dng c o lng, tit din dy c chn sao cho trnh tn tht in p khng vt qu 0,5% in p nh mc th cp.R Le1. Khi nim v bo v r le i vi cc trm bin in p cao th cng nh trong qu trnh vn hnh h thng in ni chung, c th xut hin tnh trng s c thit b ng dy hoc do ch lm vic bt thng ca cc phn t trong h thng. Cc s c ny km theo hin tng dng in tng ln qu cao v in p gim thp gy h hng thit b v c th lm mt n nh h thng. Cc ch lm cic khng bnh thng lm cho in p, dng in v tn s lch khi gii hn cho php. Nu tnh trng ko di s xut hin s c lan rng. Mun duy tr hot ng bnh thng ca h thng v cc h tiu th khi pht hin s c cn phi x l cng nhanh cng tt ch s c v cch ly n ra khi phn t b hng. Nh vy cc phn t cn li s hot ng bnh thng, ng thi cng lm gim c mc h hi ca phn t b s c. Lm c iu ny ch c cc thit b t ng mi lm c, cc thit b c gi l r le.Trong h thng bo v r le theo di mt cch lin tc tnh trng v ch lm vic ca tt c cc phn t trong h thng in. Khi pht hin s c, r le bo v s c lp phn t b s c nh my ct thng qua mch in kim sot. Khi xut hin ch lm vic khng bnh thng, r le bo v s pht tn hiu, ty theo yu cu ci t, c th tc ng khi phc bnh thng hoc bo ng cho nhn vin vn hnh.Ty theo ch vn hnh m phn ra thnh r le chnh v r le d phng.+ R le bo v chnh l r le thc hin tc ng nhanh khi c s c xy ra trong phm vi gii hn i vi trang thit b c bo v.+ R le bo v d phng l bo v thay th cho r le bo v chnh tong tng hp bo v chnh khng tc ng trong tnh trng sa cha nh. Bo v d phng cn tc ng vi thi gian ln hn thi gian tc ng ca bo v chnh, nhm bo v cho phn t b s c ra khi h thng trc tin.2. Cc yu cu i vi r le bo va. Tnh chn lcL kh nng phn bit cc phn t h hng v bo v bng cch c lp phn t .Tnh chn lc l yu cu c bnr nht ca bo v r le m bo an ton cung cp in lin tc. Nu b v khng c tnh chn lc, s c c th b lan rng.Cn phn bit khi nim ct chn lc:+ Chn lc tng i: theo nguyn tc tc ng ca mnh, bo v c th l vic nh l bo v d tr khi ngn mch phn t ln cn.+ Chn lc tuyt i: bo v ch lm vic trong trng hp ngn mch chnh phn t c bo v.

b. Tc ng nhanhYu cu ny ch p dng i vi s c ngn mch.Bo v phi tc ng nhanh kp thi c lp cc phn t b h hng trong phm vi thuc quyn bo v nhm:+ Bo v tnh n nh ca h thng+ Gim tc hi ca dng ngn mch i vi thit b+ Gim nh hng ca in p thp ln cc ph tiBo v tc ng nhanh phi c thi gian tc ng nh hn 0.1s

c. nhyBo v khng ch cn tc ng vi trng hp ngn mch trc tip m c khi ngn mch vi in tr c h quang. Ngoi ra bo v phi tc ng khi ngn mch xy ra trong h thng ch lm cc tiu, tc l mt s ngun c ct ra nn dng ngn mch cc nh. nhy c nh gi bng h s nhy:KN = Trong : In min l dng in ngn mch nh nhtIkdbv l gi tr dng nh nht m bo v c th tc ngi vi bo v tc ng theo gi tr cc tiu, h s nhy c xc nh ngc li: tr s in p khi ng chia cho tr s in p ln nht khi h hng.

d. Cc loi r le bo v thng dng cho trm bin p Bo v qu ti my bin p

Qu ti l ch lm vic khng bnh thng ca my bin p v ng c. Qu ti my bin p v tng th thng khng nh hng ng k n s lm vic ca h thng, bi v n khng lm gim p. Dng qu ti thng tng khng nhiu so vi nh mc nn c th cho php tn ti trong thi gian ngn. Qu ti my bin p thng l i xng. Do bo v qu ti thng ch cn s dng mt rle dng cc i u vo dng mt pha l . Bo v bng r le kh

Trong thc t mi s c trong my bin p du l do ngn mch bn trong thng du lm nhit trong thng du tng cao v lm du bc hi.Cu to ca rle kh: rle kh dng bo v cho cc my bin p c cng sut trung bnh v ln vi kiu my c thng gin n du. Rle kh c lp t trn on ng lin thng du t thng chnh my bin p n thng gin n du ca my theo mt chiu nht nh.Nguyn l lm vic ca rle kh: khi xy ra s c ngn mch gia cc pha hoc gia cc vng dy trong my bin p, dng in trong cc bi dy ca my bin p tng, p lc ca hi du lm cho rle nghing i so vi v tr ban u. Tu theo mc s c m rle bo tn hiu bo ng hay tn hiu ct nhanh my bin p loi tr s c.u im : C cu to n gin, nhy cao i vi hu ht cc s c xy ra bn trong my bin p. Thi gian tc ng nhanh khi tc ca dng du ln.Nhc im: Tc ng km nhy i vi cc s c nh ca my bin p. do vy, nn bn cnh bo v rle kh bao gi cng t thm bo v dng in cc i, bo v so lchC th tc ng nhm ln do nh hng ca chn ng c hc.Cn phi tm thi loi bo v khi tc ng ct khi mi rt du vo my, khi ng my bin p sau lc sa cha xong.

YMCMCTn hiuTn hiuRKRthRG(+)(-)(-)

Hnh d.1 : Nguyn l lm vic ca rle kh. Bo v so lch dc

+ Bo v so lch khng c cun hmH thng lm vic theo nguyn tc so snh trc tip v pha v gi tr dng in u vo v u ra (khi c cung cp t mt pha) hoc hai u (khi cung cp t hai pha).

YMC1MC2RLIS1IS2Ir1Ir26kV35kVIRYMC1MC2RLIS1IS2Ir1Ir26kV35kVIR

Cc my bin dng c t hai u phn t c bo v v c t s nh nhau. Cc cun th cp ca my bin dng pha cng tn c ni vi nhau bng dy dn ph v ni vi rle. Khi xy ra ngn mch trong vng bo v th dng trong rle c xc nh nh sau:Quy c chiu ca dng in nh hnh trn ta c:

Nu dng IR vo rle ln hn dng khi ng Ik ca rle th rle tc ng ct phn t b h hng. Trong trng hp lm vic bnh thng hoc khi xy ra ngn ngoi. Nu my bin p v my bin dng l l tng th dng qua rle trong trng hp ny l:

- bo v khng tc ng+ Bo v so lch dc c hm: tng nhy ca bo v so lch thng s dng nguyn l hm dng thng qua. T s nguyn l ca bo v c hm khi c ngn mch ngoi (thng qua) dng ny s chy qua cun hm (WH) ca bo v so lch. Trong lc qua cc cun so snh (cun lm vic) ca rle Wlv chy dng khng cn bng. Sc t ng ca cun lm vic c hng lm rle tc ng, cn cun hm ngn cn s tc ng ca rle khi c ngn mch ngoi vng bo v. Cun hm ca rle c s vng dy WH c xc nh theo cng thc:

Trong : I N.max Thnh phn chu k ca dng ngn mch ngoi 3 pha quy v pha u cun hm.I kcb - dng khng cn bng tnh pha s cp ca bin dng.W lv - s vng tnh ton ca cun lm vic ca rle pha c u cun hm.K at = 1,5 h s an ton k n sai s ca rle;

tg: H s gc nghing ca ng tip tuyn vi ng c tnh tc ng ca rle.

I2n.maxIKCBWL.V WH~

c tnh hm ca rle c xy dng vi quan h gia dng lm vic (I lv ) v dng hm (I h ) qua rle m bo tnh hm l ln nht v b nht. Bo v chm t 1 pha:Chm t mt pha nu khng pht hin kp thi s gy ra chm t kp qua t dng chm t s rt ln gy nguy him cho ngi v thit b, gy qu p ni b v ph hu cch in nhng ch xung yu, in p qu tng 3- 4 ln.V vy bo v khi chm t mt pha c trang b cho mi khi hnh. Bo v tc ng ct theo 2 cp:+Cp 1: Bo v ct ng dy cung cp cho khu vc c chm t.+Cp 2: Bo v ct d phng ct pha 6 kV khu vc c khng ch thi gian

T phn phi, t ng lcT phn phi nhn in t trm bin p v cp in cho cc t ng lc.

Hnh 2.4a: s t phn phi c v khng c ngun d phngT phn phiT phn phi c th c cp in t 1ngun, 2 ngun hoc 1 ngun c d phng, trong t phn phi thng t ptomat tng v cc pto mt nhnh.Ngoi thit b in lc, trong t phn phi cn t cc thit b phc v cho o m: cc ng h ampemet, vn mt, congtomet hu cng v v cng, bin dng. Nu t phn phi cp in cho ng dy trn khng hoc t ng dy trn khng ti th phi t thm chng st van h p.Khi lp t, chn t cn chn loi t, s t, chn cc ptomat, chn thanh ci, chn cc thit b o m, bo v an ton v bo v chng st+ ptomat 3pha c in p nh mc l 380V+ ptomat 1 pha c in p nh mc l 220VT ng lcCc t ng lc c cp in t t phn phi theo hnh tia hoc lin thng, v th c 2 dng s tng ng

Hnh 2.4b: s t ng lc cp in hnh tia v lin thngTrong cc t ng lc t cu ch bo v, cng c th dng t t ptomat bo v ton b hoc dng s hn hp nhnh bo v cu ch nhnh bo v ptomatVi s t lin thng Icd ca cu ch tng CCT1 phi c chn theo dng tinha ton tng ca hai nhm ng c v phi c tr s ln hn t nht l 2 cp so vi cu ch tng CCT2 cha nhm2H thng ni t L h thng ni dn dng d t my bin p, cc thit b in xung t.

+ Ni t chng st H thng ni tl b phn khng th tch ri i vi bt k h thng chng st no. N m bo cho vic dn cc dng xung st t cc thit b chng st xung t v tiu tn nng lng ca cc xung ny. Tip a ng vai tr quan trng trong vic chng st, nu thit b chng st khng c tip a tt (in tr t qu cao), vic st nh gy hu qu ln hon ton c th xy ra. Tu thuc vo yu cu tip a v in tr t ca cng trnh, chng ta c th xy dng h thng tip t chng st an ton.

- Tip t chng st l thao tc ni thit b chng st (kim thu li, dy thu st, li thu st, thit b chng st...) vi h thng ni t nhm tn dng in st vo t, gi cho in p ti mi im (trong khu vc c bo v) khng qu ln, m bo an ton cho cng trnh, thit b v con ngi khi c st nh.

- Cch thc hin h thng trang b ni t: Trang b ni t bao gm cc in cc ni t v dy ni t.

+ Cc in cc ni t bao gm cc in cc thng ng c ng su vo trong t v cc in cc nm ngang c chn trong t mt su nht nh.

+ Dy ni t dng ni lin cc b phn vi cc in cc ni t.

- Khi thc hin ni t, trc ht li dng cc vt ni t t nhin sn c nh cc ng ng dn nc hay cc ng bng kim loi khc t trong t (tr cc ng dn nhin liu lng, kh d chy), cc kt cu kim loi ca cng trnh nh ca c ni t, cc v bc kim loi ca cp t trong t (tr v cp ch, v cp thp t dng). in tr ca cc ni t t nhin c xc nh bng cch o thc t hay tnh gn ng theo cc cng thc kinh nghim.

- Nu ni t t nhin khng m bo c tr s in tr R theo yu cu th phi dng ni t nhn to.Ni t nhn to c thc hin bng cc cc thp trn, thp ng, thanh thp dt hay thp gc di 2 3m, ng su xung t, u trn ca chng cch mt t 0,5 0,7 m trnh thay i ca R theo thi tit. Cc cc thp c hn ni vi nhau bng cc thanh thp t nm ngang v cng c chn su cch mt t 0,5 0,7m.

- Mt h thng ni tthng thng bao gm cc cc tip t chng st c lm bng kim loi (st, thp, thp m km, thp m ng, ng nguyn cht) chn su trong lng t. Cc cc c lin kt vi nhau to thnh mt h thng li tip a c in tr ph hp vi yu cu chng st ca tng cng trnh, nh . c th t in tr t nh mong mun, nn s dng cc loi ho cht lm gim tr khng t (GEM). Ngoi ra, gim in tr choh thng tip av m bo h thng lm vic n nh, cn c s lin kt chc chn gia dy dn st vi cc tip a bng cc mi hn, c sit cp.+ Ni t lm vic Dng cho h thng truyn ti in+ Ni t an ton L h thng ni dn dng d t my bin p, cc thit b in xung t

Chng III. Trm bin p tiu th 560kVA-35/0,4kV cng ty LM-VINAI. Gii thiu trm Trm bin p 560kVA- 35/0,4kV cng ty LM-VINA nm trong khun vin ca cng ty LM-VINA thuc x Thi Sn- Kim Bng-H Nam l mt trm bin p gim p, c nhim v gim p, nhu cu sn xut ca cng ty. (li din t ) Trm c thit k xy dng theo kiu trm treo vi cng sut 560kVA-35/0,4kV. Trm c thit k ng dy trn khng 35kV u t ct 41 l 371 E24.11 n trm bin p 560kVA-35/0,4 kV xy dng mi. Tng chiu di ng dy trn khng l 267m. Vi mc ch, nhu cu s dng ca cng ty, n xy dng lp t trm c ph duyt, thng qua. Trm c cng ty in lc huyn Kim Bng H Nam xy dng, lp t v i vo hot ng nm 2007. Nhim v ca trm:+ Bin i in cp in p phc v nhu cu vn hnh sn xut ca cng ty.+ m bo cht lng in, duy tr s n nh cho h thng in trong qu trnh vn hnh hot ng Hin nay, vi vai tr l trm bin p tiu th, trm ang cung cp in cho cng ty LM VINA, m bo duy tr hot ng, sn xut ca cng ty, em li nhiu li nhun kinh t cho cng ty. Vi s qun l ca cng ty in lc huyn Kim Bng, trm c vn hnh v bo dng theo nh k nn cha xy ra chp chy v hng hc g ln.II. Hin trng ngun v ph ti1. Ngun Trm c cung cp ngun in 35kV t ct 41 l 371 E24.11. c dng dy cp truyn ti t ct vo trm. Trm bin i ngun in 35kV thnh dng in 0,4kV cung cp ngun s dng cho cc ph ti trong nh my hot ng sn xut. Khong cch t ct s 41 thuc l 371 E24.11 l 267m, khong cch c chia ra 4 ct ng dy truyn ti vo trm, ng dy s dng truyn in t ct 41 vo ti trm l dy 3AC50 (ti sao pha trn li ni l dy cp)2. Ph ti Trm cung co in cho cng ty gm 3 phn xng vi cng sut l 395kW. Thiu thng tin v loi ph ti (v d ph ti l cc ng c, hay chiu sng , hot ng my ca sn xut, lin tc hay ngt qung)III. Cu trc ca trm1. S truyn ti in Trm c tht k xy dng theo kiu trm gin, my bin p c treo trn gi ni gia hai ct. Cch b tr gin trm:+ My bin p: 560kVA 35/0,4kV+ ng ct pha cao th my bin p bng cu dao cao th 35kV-630A+ Bo v qu ti v ngn mch my bin p dng cu ch SI 35kV-100A c dng dy chy IDC = 15A+ Bo v qu p kh quyn lan truyn t dy vo tram bin p bng 1 b chng st van 35kV+ Ni gia cc thit b cao th xung my bin p dng thanh ci ng trn 10+ Dy ni t s h th ti t in 0,4kV la chn theo iu kin dng in ph ti cho php v kim tra cc iu kin pht nng cho php vi iu kin n nh nhit khi ngn mch 3pha ti thanh ci 0,4kV. Ta dng cp Cu/ PVC/ XLPE 185mm2 chp i cho dy pha v cp cp Cu/ PVC/ XLPE 185mm2 cho dy trung tnh.

1) X n dy u trm2) Cu dao 35kV3) X cu dao4) Chng st van 35kV5) Cu ch t ri 35kV6) X cu ch v chng st van7) My bin p8) T in 0,4kV9) Gin gh thao tc10) Dm my11) Cng son my12) Gi tay dao13) S VHD 35kV14) Ct LT12B15) Thang stNn s dng hnh v thc t thay v chp hnh trong sch mt cch cu th nh hnh trn!!! Cc thit b chnh trong trm

- My bin p:My bin p c s dng trong trm l loi my bin p ba pha do cng ty thit b in ng anh sn xut. C chiu di l 1580mm, chiu rng 982mm, cao 1437mm, tng khi lng l 1045kg, trong khi lng du trong my l 410kg. Thng s k thut:+ Kiu my: t ngoi tri, lm vic lin tc+ Cng sut nh mc: 560kVA+ Loi: 3 pha ngm trong du+ Cng sut nh mc: 560kVA+ Yu cu v kt cu: theo IEC 76 v TCVN 1984 : 1994+ Kiu lm mt: Du tun hon t nhin+ Tn s: 50Hz+ in p nh mc pha cao p: 35kV+ in p nh mc pha h p: 0,4kV+ Kiu iu chnh in : khng ti+ Phm vi iu chnh: 2 2,5%+ in p chu ng tn s cng nghip, 1 pht: 70kV+ Tn hao khng ti: 62015% W+ Tn hao ngn mch: 235015% W+ Dng in khng ti: 230% W+ in p ngn mch: 5 10%+ Kh ng chu ng dng ngn mch trong 4s: 25 ln theo dng nh mc.+ My bin p c lm mt bng du tun hon t nhin, du my bin p i lu nhit vi v my v cc cnh tn nhit lp 2 bn thnh my+ T u dy: Y/Y/12 Dao cch ly:+ Kiu DCL NT (?)+ Chiu di dng d: 680mm+ Dng nh mc: 630A+in p: 35kV+ Tn s danh nh: 50Hz+ in tr cch in:Pha 1- pha2,3 vi t: 50000MPha 2- pha 1,3 vi t: 50000MPha 3- pha 1,2 vi t: 50000M+ tng nhit 650C

+ Cu dao cch ly dng ng ct dng in xung my bin p.+ Qu trnh vn hnh dao cch ly ch c cho php ng ct dao cch ky khi my bin p khng c ti. Cu ch t ri:+ Kiu: CTR+ Dng nh mc: 200A+ in p nh mc: 35kV+ in p lm vic ln nht: 40,5kV+ Dng in nh mc dy chy: 15A+ S pha: 1 pha+ Chiu di dng d: 710mm+ Tn s danh nh: 50Hz+Mc cch in nh mc: in p chu ng tn s cng nghip, trng thi kh 1 pht; 95kV in p chu ng tn s cng nghip trng thi t, 1 pht: 85kV+ in tr cch in:Pha 1- pha2,3 vi t: 50000MPha 2- pha 1,3 vi t: 50000MPha 3- pha 1,2 vi t: 50000M+ in p th trng thi kh(kV/ pht): 95+ in p th trng thi t(kV/ pht): 85+ tng nhit 650C

Cu ch t ri bo v ngn mch v qu dng trong my bin p. Khi dng s c trong my bin p lm cho dy chy trong cu ch nng ln th dy ch s nng chy v ngt my bin p ra khi ng dy. Chng st van+Kiu: 1 pha ngoi tri+ Tn s: 50hZ+ in p danh nh: 33,6kV+ in p lm vic ln nht: 42kV+ Thi gian chu ng ca chng st mc in p tm thi ca h thng xy ra trong ch s c ngn mch 1 pha: 7200s+ Dng in phng nh mc: 110kV+ in p d ln nht tng ng bc sng: 104kV+ Kh nng chu xung st ln: 100kV+ Dng in chu ng lu di: 300A+ Kh nng chu dng ngn mch: 20kA/0,2s 600A/1s+ Chng st van ca trm c ni trc tip vi cc dy pha trn ct nhm ct bt bin nh v thot hon ton nng lng st xung t mt cch an ton. Nh vy s gim nh cho cc cch in ca ng dy v m bo tnh lin tc cung cp in cao hn. Thanh ciDng thanh ci ng trn 10, chiu di thanh ci l 15m S chui Polime+ V tr lp t: ngoi tri+ in p nh mc: 38,5kV+ Chiu di dng d t day dn n chn kim loi khng nh hn: 638 mm+ in p th li tn s 50hZ, trng thi kh: 130kV+ in p th li tn s 50hZ, trng thi t: 110kV+ in p th xung:Xung dng: 190kVXung m: 230Kv

T h th 500V-800A trn b gm 2 ngn:

Ngn m in nng v chng tn tht pha trn gm:+ Bin dng TI-800/5 A, 600/5A+ Cng t hu cng 220/380V-3x5A (KWh)+ Cng t v cng 3x5A (KVAh)Ngn t vn hnh v phn phi gm: Phn o dng in v in p+ Bin dng TI-800/5 c 3 ci+ Ampe k 800/5A c 3 ci+ Vol k 0 450V c 1 ci Phn vn hnh:+ Aptomat tng 3x800A c 1 ci+ Aptomat l 1: 3x400A c 1 ci+ Aptomat l 2: 3x400A c 1 ci+ Aptomat l 3: 3x300A c 1 ci+ Chng st van h th GZ500V c 3 qu+ Thanh ci ng dt 50x5Dy ni mch o lng: dng dy ng 1 si Cu/PVC 2,5mm2 S o lng+ o dng in pha h th dng b bin dng 800/5A v 3 ampe k 0-800A ( loi o gin tip)+ o in p pha h th dng 1 vol k 0-450V. Chuyn mch o in p dy v in p pha dng chuyn mch vol 450V

o in nng s dng b bin dng 600/5A v 1 cng t hu cng v v cng .

2. Cc phn t o lng:+ Cng t hu cng 220/380V-3x5A+ Bin dng TI-800/5 c 3 ci+ Ampe k 800/5A c 3 ci+ Vol k 0 450V c 1 ci+ Aptomat tng 3x800A c 1 ci+ Aptomat l 1: 3x400A c 1 ci+ Aptomat l 2: 3x400A c 1 ci+ Aptomat l 3: 3x300A c 1 ci3. H thng ni t H thng tip a trm s dng cc tia hn hp c tnh ton tr s tip a c in tr 4 R. Cc tip a lm bng thp hnh L63x 63x 6 di 2,5m lin kt vi nhau bng thanh. Cc chi tit st khng in ca tn b trm c m km nhng nng v ni t vi h thng tip a bng st 10 Ru tip a ni gia cc phn t thit k trm xung h thng cc hn hp c lun xung ng nha 21 t mt t ln = 2,5m. S tip a+ s tip a ct

+ s tip a cho trm

S cc tip a s dng trong trm: 6 cc, khong cch mi ct l 2,5m. 2 cc ni C1-C3, C2-C4+ C3 ni trung tnh my bin p ( ni t lm vic)+ C4 ni chng st van h th: ch ni ring vi chng st van ( ni t an ton) 1 cc ni vi h thng tip a ct 3 cc cn li ni C7,C8,C9,C10,C11,C12 vi cng son + dm my bin p, x SI, x chng st van, x cu dao, x s trung gian, x n dy u trm. (Ni t an ton).

Chng IV. Kt qu tho lun ti v ti liu tham kho

I. KT QU THO LUN ti nghin cu c cc thng s ca trm, cc thit b trong trm. Nm c cch thc s u, b tr dy, t u dy. Nghin cu v cu to, nguyn l hot ng ca my bin p, cc thit b trong trm: cu dao, chng st van, ptomat, cc thit b ni t, bo v. Cha thy tho lun g y!!!II. TI LIU THAM KHO Trnh Hng Thm- Nguyn Hu Khi- o Quang Khi. Gio trnh nh my in v trm bin p, phn in. NXB Khoa hc v k thut. Phan T Th. Gio trnh thit k my bin p in lc. Nh xut bn khoa hc k thut. L Cng Thanh. Gio trnh an ton in TRnh Hng ThmNguynHu Khi o QuangThch LVnt,(1996)Nh my in v trm bin p , Nh xut bn Khoa hc v KThut (FONT ch y khng ging cc phn khc) Bi NgcTh,(2002)Mng cung cpvphnphi in HNi,Nh xut bn khoa hc v K Thut L Vn t, (2000)Ngn mch trong h thng inH Ni,Nhxut bnKhoa hc v K Thut