变压器铁芯多点接地故障的检测及处理方法

The Checking and Handling Way of Multipoint Contractive Earth's Fault in Transformer's Iron-core

电力变压器正常运行时其铁芯只允许有一点接地 ,因为铁芯多点接地可能使不同接地点在磁场中感应出不同电位 ,形成环流 ,该电流会引起局部过热 ,导致绝缘油分解 ,还可能烧损铁芯 ,使变压器不能正常运行。因此准确、及时诊断变压器铁芯接地故障 ,对于系统的安全、稳定运行意义重大。

Usually,there have only one contractive earth's point when the transformer is in normal operation, if iron-core contracts to earth with multipoint,it will produce circulation,this current will cause to overheat in some part of the transformer and lead to decompose of the insulation oil,even damage the iron-core and the transformer will unnormal operate.So it is important to check contractive earth's fault in transformer iron-core.