摘要
包头供电局鹿钢变电站2台主变压器采用1台主变压器220 kV侧及110 kV侧中性点直接接地运行、另1台中性点经间隙接地运行的方式,系统故障、接地变压器跳闸后系统失去接地,产生了高零序过电压。提出了将2台主变压器220 kV侧及110 kV侧中性点直接接地运行的解决办法。实施后,解决了系统发生故障、接地主变压器跳闸后,110 kV系统无接地点及系统过电压问题,降低了变压器承受的故障电流。
Baotou Power Supply Bureau Lugang Substation has two main transformers, in operation with one transformer＇s neutral point grounding directly both in 220 kV side and 110 kV side, the other one＇s type is gap grounding. When system is fault, grounding transformer tripping and system losing ground, high zero-sequence over-voltage appeared. Put forward the method for both transformer＇s 220 kV and 110 kV neutral points grounding directly. After implementation, when the earthed transformer tripped while system is fault, the phenomenon that 110 kV system have grounding and system＇s over-voltage never occured and the fault current in transformer was reduced.
出处
《内蒙古电力技术》
2012年第4期54-57,共4页
Inner Mongolia Electric Power
