recloser nulec
DESCRIPTION
Ưu khuyết điềm giữa LBS và RecloserTRANSCRIPT
Recloser Nulec - u khuyt im gia LBS v Recloser
LBS v Recloser u l cc thit b ng ct. n c im chung l u ng ct c khi c ti (LBS ch ct c vi dng ti nht nh nh hn nhiu ln so vi Recloser).v trong vn hnh th LBS bo dng, sa cha em i lp t th thun li hn. Vi quy m nh (nh 1 cp in cho 1 khu vc khng quan trng, t ph ti) th nn lp LBS hn v hiu qu kinh t n mang li l u t t. Cn ngc li Recloser lp t phc tp hn, yu cu k thut cao hn, ngi vn hnh cng phi c trnh chuyn mn nht nh, khi lp Recloser v nguyn tc th vn cn phi kt hp cu dao thng . Tuy nhin LBS khng th so snh c vi Recloser v bn cht Recloser l mt my ct c chc nng t ng li nn ngoi kh nng loi tr on ng dy pha sau n khi s c, vi s c thong qua n s t ng li cp in tr li gim thi gian gin on cp in.Recloser thng lp trn (cho) ng dy, cn LBS c th lp trn ng dy c th lp trm bin p, phn phi
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Recloser l mt thit b ng ct t ng hot ng tin cy v kinh t dng cho li phn phi n cp in p 38KV. Kt cu gn nh, d lp t, vn hnh.i vi li phn phi Recloser l thit b hp b gm cc b phn sau:+ Bo v qu dng + T ng li (TL)+ Thit b ng ct+ iu khin bng tay
V tr t:Recloser c th t bt k ni no trn h thng m thng s nh mc ca n tha mn cc i hi ca h thng. Nhng v tr hp l c th l:- t ti trm nh thit b bo v chnh ca h thng - t trn ng dy trc chnh nhng cch xa trm phn on cc ng dy di, nh vy ngn chn s nh hng n ton b h thng khi c s c cch xa ngun. - t trn cc nhnh r ca ng dy trc chnh nhm bo v ng dy trc chnh khi b nh hng do cc s c trn nhnh r.
C 5 yu t chnh phi c xt n p dng chnh xc cc loi recloser mch iu khin t ng:- in p nh mc ca Recloser phi ln hn hoc bng in p ca h thng. - Dng in s c ln nht c th xy ra ti v tr t Recloser: dng in ny c th tnh c. nh mc ct ca Recloser phi bng hoc ln hn dng s c ln nht c th c ca h thng.- Dng in ph ti cc i: l dng nh mc cc i ca Recloser phi ln hn hoc bng dng ti cc i c lng trc ca h thng. i vi Recloser iu khin bng in t, dng ct cc tiu c chn c lp vi dng nh mc lu di cc i ca Recloser, mc d n thng khng qu 2 ln ga tr (gi tr dng ct t nht l gp 2 ln dng ph ti nh).- Dng s c nh nht trong vng c bo v bi Recloser: c th xy ra cui on ng dy c bo v phi c kim tra xem Recloser c th cm nhn c ct dng hay khng.- Phi hp cc thit b bo v khc trn c pha ngun v pha ti ca Recloser: Vic phi hp trn cc thit b lp t pha trc v sau recloser rt quan trng khi 4 thng s u tin c tho mn. Vic la chn thi gian tr thch hp v th t hot ng chnh xc rt quan trng vi bt k vic ct tc thi v mt in do s c s c hn ch n phn nh nht c th ca ng dy. - Thng thng Bo v qu dng (BVQD) s lm vic ct My ct (MC) vi c tnh thi gian cp I. - Sau khi TL tc ng ng li MC, BVQD s c chuyn sang ch sn sng hot ng vi c tnh thi gian cp II chm hn.- S ln TL c th lp trnh t ( 0-3 ) ln, iu ny tng ng vi s ln ca bo v qu dng lm vic ct MC t ( 1-4 ) ln.- T iu khin cho php lp trnh thay i s ln tc ng BVQD sau khi TL cng nh s ln TL trc khi kha v ct hn MC l ty .
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My ct t ng li ba pha treo tr loi R27LL c r-le lp t bo v bn trong my (ACR) thch hp s dng ngoi tri. My ct ny c thit k, th nghim v ch to theo tiu chun ANSI C37.60.1981.ACR c th c dng nh my ct t ti trm hoc my ct ng dy vi mc ch bo v chn lc bo v tng on v t ng ti lp in sau khi xy ra cc s c thong qua.Phn c cu ng ct bn trong my gm ngun bung ngt tip im chn khng truyn ng ng thi bng mt cun dy solenoid duy nht. Sau khi ng c cu c ny c gi bng cht chn v khi ct bng solenoid, c cu ny c m ra nh nng lng tch tr bn trong l xo.ng hoc ct my ct bng cun dy solenoid c gi l kiu iu khin bng in v c th dng bng tay nh t iu khin hoc dng my vi tnh c nhn, do tc ng ca r le bo v hoc bng cch iu khin t xa.Ngoi cch iu khin bng in, bn hng thn my ct c b tr mt cn thao tc sn mu vng dng ct bng so.Vic ct ny ch tc ng trn c cu c kh m khng dng ngun nn c th s dng khi vic iu khin bng in khng thc hin c.R le bo v c t trn mt ngn thit b lp di y my ct. Thng thng, ngi s dng khng sa cha g c i vi ngn thit b v r le bo v. Nu cn sa cha r le bo v, ta s thay th c ngn thit b. Ta c th thc hin c vic ny ngay c khi my ct cn trn tr ngoi hin trng. Ngn thit b thay th lun c km theo cc hng dn lp rp chi tit.Rle bo v c cp ngun t li trung th thng qua bin dng lp bn trong my trn pha V. Khi khng c dng chy qua pha V, r le c cp in bi cc acquy t di y my ct. cc v tr lp t c dng ph ti trung bnh khng np acquy, NULEC c th cung cp thm mt bin p ly in t li trung th hoc h th dng lm ngun ph np cho acquy .Cc gi tr t bo v chn cho r le bo v c lu gi trong b nh in t EEPROM. thay i cc gi tr bo v chn, cn s dng t iu khin hoc my vi tnh ni vi my ct thng qua cp quang cch in. V tr u ni cp quang vo my ct c b tr di y my ct .Nu lec c th cung cp nhiu loi t iu khin xch tay hoc lp c nh.Recloser Nu.Lec - Australia
I. Tiu chun p dng: Thit b c thit k, ch to, kim nghim theo tiu chun ANSI C37-60.
II. iu kin mi trng lm vic: Thit b s dng lp t ngoi tri, trn ct, kh hu nhit i- Nhit mi trng lm vic: - 30 n + 500C- m ln nht: 100% - cao trn mc nc bin: 3000m- Tc gi ln nht: 35m/s
III. Thng s chi tit:Hp b thit b bao gm: Recloser, t iu khin, bin in p dng cho o lng, bo v; bin in p cp ngun. Tt c cc thit b c lp t trn cng mt v tr ct. Bin in p lp trc Recloser (v pha ngun).
1. Cc c tnh nh mc ca Recloser:- Recloser loi 3 pha, dng lp t trn ct, dp h quang trong bung chn khng, cch in bng SF6 hoc cht in mi rn. Trn v ngoi Recloser c sn v tr lp chng st.
1. Kiu N38 N27 U27 U152. in p nh mc 38kV 27kV 27kV 15,5kV3. Dng in lm vic lin tc nh mc 630A 630A 630A 630A4. nh mc ct dng ngn mch 12,5kA/3s 12,5kA/3s 12,5kA/3s 12,5kA/3s5. nh mc ct dng ngn mch nh 31,5kAp 31,5kAp 32,5kAp 32,5kAp6. bn c kh (ln) 10.000 10.000 10.000 10.000 7. Cch in SF6 SF6 Epoxy Epoxy- Recloser c kh nng ng lp li t nht l 3 ln, kh nng ct 4 ln trc khi kho.- Thi gian ngng (thi gian ch ng li) c kh nng iu chnh c.
2. Thit b iu khin: - Thit b iu khin c lp t trong t treo trn ct ngoi tri trong iu kin nhit i.- Thit b iu khin s dng vi mch in t, bao gm cc chc nng o lng, bo v v lu cc s kin.- C kh nng cho php gim st, iu khin ti ch v t xa, kt ni vi h thng SCADA/EMS.- Cc chc nng bo v:Thch ng vi c li trung tnh cch in v li trung tnh ni t trc tip hoc ni qua cun khng, qua in tr ni t. Cc c tnh bo v (50/51, 50/51N, 79, 67/67N, 46, 81, 67Ns, FR):+ Bo v qu dng nhiu cp c tnh thi gian c lp v ph thuc.+ Bo v chm t c hng nhy cao, nhiu cp c tnh thi gian c lp v ph thuc- Cc chc nng o lng:o dng in, in p, cng sut tc dng, cng sut phn khng, h s cng sut (Cos)- Cc chc nng lu gi s kin:Lu gi y cc s liu o lng, gim st v cc thng s khi thit b lm vic, s ln ng ct.Lu gi c 5.000 s kin khi thao tc ng ct.
3. iu khin thao tc Recloser:Recloser c kh nng thao tc ct bng tay (khng in) v thao tc ng/ct c bng in ti ch v t xa. Recloser c ch th trng thi ng ct kiu c kh. C c qui cp ngun iu khin trong trng hp mt ngun xoay chiu.
4. c qui cp ngun iu khin:S dng c qui c thit b np km theo cung cp ngun iu khin cho Recloser. Khi mt ngun xoay chiu, c qui duy tr dung lng thao tc, iu khin trong thi gian hn 120 gi.Tui th c qui: 5 nm.c qui c s dng l loi c qui kh (sealed lead acid) thng dng (24VDC 7.2Ah) c sn trn th trng vi gi r thun tin cho vic thay th.
5. Bin in p: 5.1 S dng bin in p t in 3 pha hp b (c sn bn trong) vi Recloser ly tn hiu in p cho o lng, bo v. H thng o lng c th o lng mi gi tr in p mt cch t ng. 5.2 S dng 01 MBA cp ngun:- in p th cp 110VAC hoc 220VAC, dung lng 100VA dng cho khi iu khin, in p np c qui v thao tc ng ct Recloser.- Bin in p c in p s cp 38,5kV.
6. Bin dng in:Bin dng in lp trn c 3 pha bn trong Recloser, s dng ly tn hiu o lng v bo v. H thng o lng c th o lng mi gi tr dng in trong phm vi 2,5A n 800A (cho o lng) v n 12.500A (cho bo v) mt cch t ng. Cp chnh xc cho o lng: 0,5Cp chnh xc cho bo v: 2,5
7. S dng ti Vit Nam:Recloser NULEC c lp t v vn hnh n nh trn li in Vit Nam t nm 2004. c cc in lc trc thuc PC1, PC2, PC3, in lc Hi Phng,cc nh my cng nghip a vo s dng v khai thc mang li hiu qu cao.Recloser c th lp t mt cch linh hot ty theo mc ch s dng, m bo cc yu cu v an ton in trong qua trnh vn hnh.
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PHNG N KT NI T XA RECLOSER NULEC
Thc hin vic iu khin 02 b Recloser lp 2 v tr khc nhau t phng iu khin. Cc chc nng c th thc hin c t xa:+ iu khin ng/ct Recloser. + Ci t chnh nh cc thng s.+ Thu thp cc thng s vn hnh: dng, p, cng sut, v cc s kin trong eventlog, ...Khi ngi iu khin mun thao tc hoc ly d liu t recloser no th ch cn kt ni ti recloser , ti mt thi im ch kt ni c ti 01 recloser.Phng n kt ni ti recloser:+ S dng modem dial up + line in thoi c nh ko ti tng recloser, phng n ny t c s kt ni n nh hn tuy nhin li c nhc im l kh nng b st nh vo ng dy in thoi v dn ti ph hy cc thit b bn trong t iu khin.+ Dng modem GSM c gn sim i dng. Phng n ny s khc phc c nhc im v chng st, tuy nhin hn ch ca phng n ny li l tc v n nh khng bng so vi khi s dng line in thoi c nh
Thit b t ng ng lp U series
Recloser U series
U series: c tch hp sn bin dng mt pha v bin in p hai pha kt hp vi t iu khin bo v chuyn dng c kh nng loi b cc s c thong qua m bo cht lng vn hnh li in (90% cc s c trn li l s c thong qua), c bit ph hp vi li in c ng dy di, a hnh phc tp.
Thit b c thit k vn hnh trong iu kin mi trng lm vic khc nghit ti nhiu vng kh hu vi nhit mi trng lm vic t -30 n +500C, m ln nht 100%, c bit thit b c kh nng hot ng ti cao ln n 3000m trn mc nc bin.
V my bng thp khng r tch hp ch th v tr vn hnh my ct.
My ct dp h quang trong chn khng, cch in bng cht rn: Um - 27kV, Im - 630/800A, dng ngn mch 12.5kA.
Kh nng ng ct ti dng ngn mch 50 ln, s ln ng ct c kh 10.000 ln (tng ng vi tui th thit b 20-30 nm).
T iu khin bo v c thit k chuyn dng vi cc chc nng bo v phong ph 50/51, 50/51N, 79, 67, 46, 81, 67Ns, FR.
Thit b c kh nng k ni SCADA theo tiu chun IEC 103 hoc kt ni iu khin t xa qua mng in thoi c dy, khng dy...