基于负载电压偏移的自适应零线断线保护原理与实现  

Protection Principle for Self-adaptive Zero Line Disconnection Based on Load Voltage Excursion and Its Implementation

作　　者：何智祥 曾永浩 梁唐杰 陈安明 

机构地区：[1]广东电网有限责任公司佛山禅城供电局,广东佛山528000 [2]佛山电力设计院有限公司,广东佛山528000

出　　处：《广东电力》2016年第10期116-120,共5页Guangdong Electric Power

基　　金：中国南方电网有限责任公司科技项目(K-GD2014-0844)

摘　　要：为解决传统零线断线保护灵敏度较低的问题,根据配电系统零线断线前后负载电压的偏移特征,提出一种基于负载电压偏移的自适应保护方案,利用零线电流的大小自适应调整定值,从而提高了零线断线故障时保护的灵敏度。给出了保护原理的硬件设计框图和软件流程,并通过实验验证了该保护方案可行、有效。In order to solve the problem of low protection sensitivity of traditional zero line disconnection, this paper presents a kind of self-adaptive protection scheme based on load voltage excursion according to excursion features of load voltage before and after zero line disconnection. By using self-adaptive adjusting setting value of zero line current, it is able to improve protection sensitivity at the time of disconnection fault. It also presents hardware design diagram and software flow and proves feasibility and validity of this protection scheme by experiments.

关 键 词：零线断线 自适应保护 负载电压 零线电流 

分 类 号：TM773[电气工程—电力系统及自动化]