摘要
在实际工作中,工频变化量距离保护继电器的动作特性会受到保护线路的影响。从工频变化量保护的基本特性出发,具体分析了以下两种情况:当保护背后线路含等效容性阻抗元件时,影响系统的测量阻抗,使得保护距离缩短,导致工频变化量继电器的误动作;当线路发生短路故障时,因限流器投入系统而增加的额外阻抗值不仅会影响到工频变化量继电器的测量阻抗值,也会影响到继电器的固有特性,从而导致继电器的误动作。并提出了通过改变整定值的方法来解决误动的方案。
In practical work, the frequency variation distance protection relay operating characteristics will be impacted by the protection circuit. On the base of the characteristics of the frequency variation protection, this paper analyses the two situations： when there is an equivalent capacitive impedance which is put into the protection＇s opposite direction, the system measured impedance will be affected, so that the protection distance is shortened, which will cause the malfunction of the distance protection using power frequency variable components; when there is a short-circuit in the line, the fault current limiter can limit the current lever, but the additional impedance values which brought in by the fault current limiter will not only affects the measurement of the impedance of the relay, but also affects the characteristics of the relay, which will also cause the malfunction of the relay. And a solution of malfunction by resetting the value of setting imoedance is offered.
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2015年第20期51-57,共7页
Power System Protection and Control
关键词
工频变化量
距离保护
容性阻抗
故障限流器
动作特性
power frequency variable components
distance protection
capacitive impedance
fault current limiter
operating characteristics
作者简介
徐妍（1987-），女，博士研究生，研究方向为电力系统继电保护；E-mail：njupt—xuyan@163．com。
陆广香（1956-），男，教授，博士生导师，主要从事电力系统继电保护方面的研究；
徐晓敏（1984-），男，主要从事电网的运营与监测工作
