Author(s)

Jianli Zhao, Yujia Hou, Taowei Liu, Bo Liu

Corresponding Author

Jianli Zhao

Abstract

Through the live detection of partial discharge, it is found that there is an insulation discharge phenomenon at the end of the B phase cable of a 35kV Switchgear. After power failure inspection, it was found that there was obvious discharge traces in the contact position between B phase cable and ground whip. After the disintegration of the cable head, it is found that the production process of the cable head is bad and the shielding layer is missing, which leads to the uneven local electric field. Meantime, it is also found that there is an aging phenomenon in the main insulation of B phase cable, and its colour has been changed from white to dark yellow. The insulation defect is effectively discovered by the live inspection work, which makes the occurrence of power accidents be avoided with the equipment long-term operation.

Keywords

Switchgear, Partial discharge, Electrification detection, Power cable