Abstract：The 500kV breaker body non-phase protection is an important grarantee for safe and stable operation of breaker. Combined with a 500kV breaker body non-phase defect founded in 500kV Wuzhou substation,This paper have a discussion with the non-phase protection secondary circuits of the FXT17 500kV breaker;And make a depth analysis on secondary circuits of breaker; Reform schemes are brought out according to the hidden danger caused by the intermediate relay damaged,solve the hidden danger of breaker action incorrectly caused by non-phase protection secondary circuits design of breaker body.
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2014, Vol. 15 
