【摘要】 介绍了一起热电厂因线路割接后频繁出现三相电流不平衡现象,并根据电能质量在线监测系统历史数据,确认异常原因为上级电网电气化铁道负荷产生的负序电流引起,显示出电铁负荷造成的负序电流污染影响范围十分深远,发电机对系统负序电压十分敏感。更多还原

【Abstract】 A three phase current unbalance phenomenon after replacement of power line in a thermal power plant is introduced.Based on the historical data of on-line power quality monitoring system,it is confirmed that the abnormal phenomenon is caused by the negative sequence current produced by electric railway load from upper power grid;it is shown that the pollution influence of negative sequence current produced by electric railway load is very wide,and the generator is very sensitive to negative sequence voltage.更多还原