关于工频变化量距离保护可靠性的研究  

Research on the reliability of the distance protection using power frequency variable components

作　　者：徐妍[1] 陆广香[1] 徐晓敏 陈中[1] 

机构地区：[1]东南大学电气工程学院,江苏南京210096 [2]淮安市电力公司,江苏淮安223002

出　　处：《电力系统保护与控制》2015年第20期51-57,共7页Power System Protection and Control

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.

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 

分 类 号：TM773[电气工程—电力系统及自动化] TM761