短线路的自适应阻抗继电器方案的研究

A daptive Impedance Relay for Short Line

本文在分析了圆特性方向阻抗继电器、电抗继电器和四边形阻抗继电器的基础上，从短线路本身特点及其故障特点出发，根据小定值的特点，提出了一种适用于短线路的阻抗继电器，该方案充分利用微机的计算能力和判别能力，采用电抗继电器和圆特性阻抗继电器的组合，即电抗继电器测量短路阻抗，圆特性方向阻抗继电器作为方向元件及负荷限制元件。该继电器整定方便、选相能力强、方向明确、容易实现阻抗继电器的自适应，具有较强的躲负荷能力和较强的抗过渡电阻能力。

According to the small setting value and the characteristics of the short line and its fault,an adaptive impedance relay for short line has been put forward in this paper on the basis of the detailed analysis of circular directional impedance relay,reactance relay and quadrilateral impedance relay.The relay posed takes full advantages of the calculating and judging capability,with the reactance relay measuring short circuit impedance,the directional impedance relay directing correctly.This relay is able to protect big transition resistance and avoid the load impedance.When used as single phase ground relay,it is easy to be made to protect transition resistance adaptively.