Fault Analysis on Arresters for 500 kV Zengheng Line A of Zengcheng Substation
Lin Qi-xiong · Guangdong Electric Power · 2008
On August 21,2007,the 500 kV Zengheng Line A of Zengcheng Substation under Guangzhou Power Supply Bureau tripped due to lightning strokes,and the arresters on Phase L2 were damaged.This paper describes the process of the fault.Through analysis upon electrical test and strip inspection,internal insulation breakdown is deemed to be the reason for the arrester damage.By analyzing the historical test data of the arresters on three phases,it is found that the resistive current of Phase L1 arrester tends to increase.So analysis upon test and strip inspection of arresters on Phases L1 and L3 is also made,coming to the conclusion that there exists common insulation defect in the arrester of XAP 550B1/444 type.Finally,solution to the common defect in this batch of XAP 550B1-type arresters is put forward.