110kV电缆复合终端局部发热缺陷分析与处理

为查找110kV沥海乙线电缆复合终端局部发热的原因,对发热的B相电缆终端进行了局部放电、超声波、紫外线等试验检测,并对该电缆终端进行解体检查.分析认为,B相电缆终端瓷套管绝缘油受潮劣化,导致介质损耗增大,是该电缆终端发热的主要原因.更换该套管绝缘油后电缆重新投运,运行情况正常.

Analysis and Treatment of Local Overheating Defect of 110 kV Cable Composite Terminal

In order to find the reason of local overheating of cable composite terminal of 1 lOkV Li-Hai-Yi Line,partial discharge, ultrasonic and ultraviolet tests are made to the overheating cable terminal of phase B,and the cable terminal has been detected in disassembled condition. Analysis results show that the moisture deterioration of porcelain bushing insulating oil of the cable terminal of phase B which leads to the increasing of dielectric loss is the main reason of the overheating of the cable terminal. The cable is put into work again after the replacement of bushing insulating oil, and the operation situation is normal.