摘要
对某I10 kV内桥接线变电站进线开关距离I段保护在空投变压器时误动的原因进行了具体分析,表明电压互感器二次回路切换延时的存在是造成此次误动的主要原因。建议距离保护直接接入未经开关及刀闸辅助接点切换的电压互感器二次电压,,新建的110 kV内桥接线变电站高压侧母线安装三相电压互感器,110 kV线路侧不装设电压互感器或只装设一相电压互感器。
The paper analyzes the causes of distance zone I protection maloperation of the incoming line switch in transformer no-load operation in a l lO kV substation with inner bridge connection, points out that the voltage transformer secondary circuit switching delay time is the main cause of this maloperation. Based on which, the paper suggests that directly connecting distance protection device with voltage transformer secondary voltage without switching may help solve the problem, installing three-phase voltage transformers on the 110 kV busbar instead of nlounting voltage transformers on the 110 kV line, or installing only single-phase voltage transformer on the 110 kV line in the new 110 kV substation with inner bridge connection.
出处
《陕西电力》
2013年第8期60-63,共4页
Shanxi Electric Power
关键词
距离保护
误动
励磁涌流
电压切换
内桥接线
distance protection
maloperation
magnetizing inrush current
voltage switching
inner bridge connection
