一起发电机定子接地事故的分析处理

Analysis of Processing and Thinking with the Generator Stator Ground Fault

文中介绍了华能铜川电厂发电机100%定子接地保护的原理及构成,一起发电机定子接地事故分析及处理过程,并对机端零序电压和中性点零序电压差异较大问题进行分析,发现原因是发电机中性点接地变压器二次抽头接线错误,并通过试验对此进行了验证。指出了出现这种问题的原因,是启动试验过程中没有采用实际发电机零序电压来检查零序电压回路的正确性,建议在启动过程中增加发电机定子接地试验项目来彻底杜绝此类问题发生。

This paper describes the Huaneng principle and composition of the Tongchuan power plant generator 100% stator ground fault protection, and with the generator stator ground fault analysis and processing, and machine-side zero sequence voltage and neutral point of zero sequence voltage difference larger analyze the problem, found that because the generator neutral grounding transformer secondary tap wiring errors, and verified by experiment. Pointed out the reasons for this problem is to start the testing process does not use actual generator zero-sequence voltage to check the correctness of the zero-sequence voltage circuit, the proposed increase in the boot process, the generator stator ground pilot projects to eradicate such problems occur.