﻿ 配电系统零线断线保护原理及现场应用

# 配电系统零线断线保护原理及现场应用Distribution System Zero Line Break Protection Principle and Application

Abstract: When zero line disconnection occurs in three-phase distribution system, a displacement voltage will appear at the neutral point of client, which may cause the equipment and personal safety ac-cident. The relation between neutral point voltage and load unbalance is studied when zero line disconnection occurs in three-phase distribution system. The theoretical analysis shows that: zero sequence voltage appears at the neutral point and there is no zero sequence current when the zero line disconnection occurs. Based on this characteristic, a new method to detect zero line disconnection is proposed based on zero sequence voltage with zero line current blocking, and the layout scheme is studied.

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