南瑞继保定子接地保护在锦屏二级水电站的应用

摘要

锦屏二级水电站采用了南瑞继保注入式和“零序＋3次谐波”电压定子接地保护原理，实现了不同原理的双重化配置。阐述了定子接地保护的原理，介绍两套定子接地保护的试验步骤，给出了试验结果，对定子接地保护试验过程中出现的几个问题进行了分析，验证保护的合理性。%The stator earth-fault protections with voltage injection and "zero-sequence voltage plus 3rd harmonic"are adopt-ed in Jipin-2 Hydroelectric Power Station , so the duplicate configuration of protections with different principles is realized . Firstly, the principle of stator earth -fault protection is described , and then the test procedures for two stator earth -fault pro-tections are introduced with the test results .At last, some questions during the test of stator earth -fault protection are ana-lyzed, and the reasonableness of the proposed protection is verified .