40．5kV附带TA式断路器问题分析

Problems of 40.5 kV circuit breakers with TA

内附TA断路器是一种将TA与断路器结合于一体的断路器,可以是SF6断路器,也可以是SF6气体绝缘真空断路器,TA布置在断路器上下瓷套之间。内附TA断路器由于无须外设TA,节省了成本,减少了占地面积。针对近年来河北南部电网多次发生内附TA断路器故障,对内附TA式断路器TA的绝缘方式、SF6气体湿度的影响、TA二次线引线管放电原因及引线管材质等问题进行分析,并提出建议。

A circuit breaker （CB） with an inner-TA is a kind of circuit breakers combined with a TA. It can be a SF6 CB or a vacuum CB with SF6 insulation. The position of the TA is between the upper porcelain bushing and the down porcelain bushing. The CB with an inner TA doesn＇t need any outer TA, the cost is less and the occupied area is small. But there were several accidents recently occurred due to the circuit breakers with TA in Hebei southern grid. This paper analyzed the TA insulation method, the influence of SF6 moisture, the discharge reason of secondary, wire＇ s lead bushing of the TA and its material of the CB with an inner TA, and presented some suggestions for references.