配电变压器低压侧单相接地短路故障的过电流保护  

Protection of Over Electric Current of Single-phase Ground Connection in Low Pressure Side of Transformer in Power Distribution

作　　者：林双喜[1] 徐文兴 

机构地区：[1]武汉化工学院自动化系,湖北武汉430074 [2]武汉化工设计研究院,湖北武汉430074

出　　处：《江苏电器》2006年第4期19-22,共4页

摘　　要：针对常用10／0.4kV、联结组别分别为Y,yn0及D,yn11的配电变压器,利用装于变压器高压侧的过电流保护兼作低压侧单相接地保护的情况,就变压器高、低压侧短路电流的计算、电流互感器不同接线方式时流过电流继电器的电流、保护装置的动作整定电流的计算和灵敏系数的校验进行了论述,进而归纳出Y,yn0及D,yn11的配电变压器采用这种保护方式的适用范围。To the 10/0.4 kV transformer in power distribution with Y, yn0 and D, ynl 1 link group which using the protection of over electric current in high pressure side acted as the protection of single-phase ground connection in low pressure side concurrently, the current in short circuit in low pressure side and high pressure side of transformer, the current in electricity relay which is occurred in different connection of electricity mutual device, the setting current in relay device, and the verification of relay device＇s sensitivity is analyzed. Eventually, the application range of this method is presented.

关 键 词：配电变压器 单相接地短路 过电流保护 对称分量法 动作整定电流 灵敏系数 

分 类 号：TM421[电气工程—电器]