10kV真空开关柜装设过电压保护装置必要性分析

Necessity Analysis for Deployment of Overvoltage Protection Devices in 10 kV Vacuum Switch Cabinets

针对10 kV真空开关柜中大量装设MOA的现况,通过对真空断路器操作过电压和雷电过电压产生机理的分析,指出配电网中大量装设MOA的弊端,提出在可靠保护内外过电压的前提下,合理、必要装设MOA的意见,为修订长期惯用的典型设计方案提供参考。

In view of the current situation of widely installing the metal oxide arrester(MOA) in 10 kV vacuum switch cabinets,the mechanism of overvoltage generated by vacuum circuit breaker operation and lightning stroke are analyzed in this paper and the drawbacks of massive application of MOA in distribution networks are pointed out.The advice of reasonable and necessary installation of MOA on the premise of reliable protection of internal and external overvoltage is put forward,which provides a reference for revising the typical design scheme used for a long time.