微机距离保护中几种接地距离继电器方案的分析比较

接地距离继电器最关键的问题之一是继电器耐受过渡电阻能力的强弱。接地故障时，由 于过渡电阻的存在可能导致继电器稳态超越或拒动，从而严重地影响了接地距离保护的性能 。文章对几种用于微机距离保护中的接地距离继电器的运行特性进行分析和比较，以期获得 性能最优的接地距离保护方案。

ANALYSIS AND COMPARISON OF SEVERAL SCHEMESOR DIGITAL GROUND DISTANCE RELAYS

One of the most important problems of the ground distance protection is the capability of the fault resistance endurance. The fault resistance may cause the steady state overreach or underreach of the ground distance relay at the ground fault conditions. Thus ,the performance of the ground distance protec-tion may be affected seriously by the fault resistance,In this paper,the authors analysis and compare theoperation characteristic of several schemes for the digital ground distance relays in order to find out the opti-mal scheme for the protecting device.