Significant progress in HV cable testing tech

China recently made a significant breakthrough in high-voltage cable testing technology with the successful application of its first domestically developed special test bushing for connecting both inside and outside high-voltage switchgear rooms.

The technology, developed by State Grid Zhoushan Power Supply Co, was applied during the cable tolerance voltage test at the 110-kilovolt Daixi substation in Zhoushan, Zhejiang province.

It effectively addressed a longstanding challenge in the gas insulated switchgear environment — a critical component of power systems — where limited internal space and structural constraints have long complicated testing procedures.