基于负载电压偏移的自适应零线断线保护原理与实现

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 be-fore 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.