Summary: The analysis that passes breakdown of ground connection of typical to dc, search, put forward to search the main train of thought of breakdown of complex dc ground connection, remove trouble of dc ground connection in order to help as soon as possible, ensure the system is safe.
　 Keyword: Shed ground connection continuously; Air switch; Short circuit; At 2 o'clock ground connection
　　Plan law classifies date in: TM63Document label is piled up: BArticle number: 1003 - 6954(2002)04 - 0012 - 02

Origin: HTtp://tede.cn

１Of the problem put forward

　　From 220 KV of bureau of tribute cable industry easy makes the same score transformer substation one day to issue signal of dc ground connection often, ground connection detects for dc anode because not complete ground connection is broken when the hair when this signal, staff member Ⅰ microscope fails to find ground connection to nod, after signal of this ground connection disappears, undertake 220 KV generatrix pours brake operation, adding up to 1 advocate change brake of mother side knife 2011 when, Ⅰ of 220 KV paragraph photograph of A of bus voltage transformer is automatic air switch tripping operation, issue the premonitory signal of dc ground connection at the same time, ground connection detects for dc anode complete ground connection, signal of this ground connection operates end hind in knife brake, signal of dc ground connection did not disappear, but test of ground connection voltage is dc anode again not complete ground connection.

　 2 breakdown are judged

　　From close 2011 knives gate, phenomenon of tripping operation of automatic air switch comes to photograph of PT A of mother of Ⅰ of 220 KV look, OK and affirmatory, Ⅰ of 220 KV paragraph loop of bus A phase voltage has short circuit phenomenon to happen. Accompany the generation that has signal of dc anode complete ground connection at the same time, and one but secure after brake of 2011 generatrix knife, signal of this ground connection develops positive electrode again not complete ground connection, according to above phenomenon preliminary judgement is:
Ⅰ of ① 220 KV paragraph loop of bus voltage switch or relevant voltage loop have short circuit trouble;
② is put in a fixedder dc anode in dc system breakdown of not complete ground connection;
③ has the trouble of a dynamic dc ground connection in the unit process of cargo bandling of 2011.

　　 3 breakdown are searched

　　Check the operation return of 2011 above all, discover a problem. Origin: WWw.tede.cn

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