8/2/2019 Cau Truc Hai Tang Cua TBA

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8/2/2019 Cau Truc Hai Tang Cua TBA

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LA (Lightning Arrester): Chng st van

PI (Post Insulator): cch in

DS (Disconnect Switch): Dao cch ly

CB (Circuit Breaker): My ct in

CT (Current Transformer): My bin dng inCVT: My bin in p

Cc nhn xt:

1. Cu trc hai tng ca trm th hin hai tng dy ca Thanh gp v x n dy. sn 220kV v sn 110kV

u c cu trc hai tng nh vy, chng ch khc nhau khong cch pha- pha v khong cch phat.

+ Sn 220kV c hai cao hxtng ng l:

Thanh gp: hx = 11m X n dy: hx = 17m

+ Sn 110kV c hai cao hx tng ng l :

Thanh gp : hx = 8m X n dy: hx = 11m

2.Ty vo ngn l c th m ta thy c trng hp ngn l F01 x n dy bao trm pha trn x thanh gp

(do phm vi bo v ca ct thu li khu vc ny ch cn xc nh cho cao ca x n dy). Tuy nhin

khng phi lc no x n dycng bao pha trn che chn (t nhin) cho x thanh gp. Nh c th

thy mt ct ngn lF02, x thanh gp 1 v 2 khng c che chn bi x n dy. Do phm vi bo v

ca ct thu li khu vc ny phi xc nh cho cao ca x thanh gp(i vi khu vc x thanh gp) v

cao x n dy (khu vc x n dy).

3. Chnh v l do trn m phi tnh ton phm vi bo v2 cao hxtng ng cho tng phn sn ca trm

bin p. C th tng ngn l, cao c th l bao nhiu th cn cn c mt ct suy ra. Mt ct trong

nhiu trng hp khng c v chi tit cho tt ccc ngn l. Do cu trc vc bn l nh nhau nn c

th suy trc tip hoc cn cthm vo s nguyn l mt si ca trm v ti liu Phn in NM v

TBA suy lun ra.

4. Hiu bit cu trc ca trm nh vy cng cn thit tnh ton kinh tcho tng phng n (1 v 2) so

snh la chn phng n ti u, do ct thu li trm bin p 220/110kV thng c t trn x tn dng

cao. cao c th ca x s lin quan trc tip ti phn vt liu cn thit s dng xy ct thu li ti

cao cn thit tnh ton (h=hx + hamax)