相线中性线短路故障及其保护的探讨

Discussion on the Phase-to-neutral Short-circuit Fault and its Protection Method

在市政等工程中,特别是景观、道路照明等长距离供电工程中,重点基本侧重于相间短路故障、接地故障保护及防电击防护措施,而忽略了对相线中性线短路故障灵敏度校验。本文通过分析相线中性线短路故障时故障电压、电流特性及其危害,提出了相应的保护措施。

In municipal engineering,especially in long-distance power supply projects such as landscape and road lighting,the focus is basically on phase-to-phase short-circuit faults,earth fault protection,and anti-shock protection measures,while the sensitivity check for phase-to-neutral short-circuit faults are ignored.This article analyzes the voltage and current characteristics of the phase-to-neutral short-circuit fault and their hazards.In addition,corresponding protection measures are proposed.