Research on non-communication protection of distribution lines based on fault components

摘要

When distribution power lines run normally, there is asymmetrical current and voltage component including negative sequence and zero sequence components. So non-communication protection based on sequence components might mal-operate or mis-operate in the cases. The paper proposed a new noncommunication protection scheme based on fault component for distribution line. The protection can be applied to different neutral grounding mode including direct and indirect grounding neutral system and isn't affected by normal running asymmetrical component. According to the fault component (or the incremental quantities of three sequence component), it can assure that one end breaker of fault line trips as quickly as possible and other end breaker is accelerated to trip. Simulation shows that the protection scheme is both correct and effective.