发电机注入式定子接地保护方案改造及现场应用  

Modification Scheme and Application of the Generator Stator Earth Fault Protection with Voltage Injection

作　　者：梁少华[1] 申建彬[1] 张杰[1] 李华忠[1] 陈佳胜[1] 张琦雪[1] 

机构地区：[1]南京南瑞继保电气有限公司,江苏南京211102

出　　处：《江苏电机工程》2013年第1期34-36,共3页Jiangsu Electrical Engineering

摘　　要：四川YL水电站2台120 MW发电机,中性点直接经过电阻接地。国产常规的注入式定子接地保护方案中,注入电源输出端不允许承受很高的电压,因而无法直接将电源输出端加在高压电阻两端。阐述了该情况下注入式定子接地保护方案,保留了中性点接地的高压电阻,节省了改造费用。现场模拟定子接地故障实验结果表明,保护装置能准确测量一定阻值范围内的接地过渡电阻,相对误差可控制在±5%内。There are two 120MW generators, which with resistor connected directly between generator neutral and ground, in YL hydropower station in Sichuan province, China, The voltage injecting stator earth fault （SEF） protection is in common use. However, it can＇t be directly used in the generators in YL hydropower station, because the terminators oftbe injection voltage source can＇t be connected directly to the grounding resistor, which probably with high voltage when SEF occurs. A new scheme of SEF is presented, and it is verified by the experimental results. The relative errors of measuring results of earth fault resistors are not greater than ＋ 5%. Moreover, the high voltage grounding resistor is reserved and the engineering cost is reduced.

关 键 词：发电机 注入式 定子接地保护 

分 类 号：TM31[电气工程—电机]