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China's first 500kv submarine cable ready for operation

Updated : 2019-01-04

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Workers test the 500-kilovolt submarine cable on Jan 3 in Zhoushan. [Photo/zj.zjol.com]

The 500-kilovolt submarine cable laid between Ningbo and Zhoushan one and a half months ago proved ready for operations as it passed a technical test on Jan 3.

The 17-kilometer cable, developed by the State Grid Zhejiang Electric Power Co and related national research institutes and cable manufacturers, is the first domestic-made 500kv submarine cable, and also the world's first 500kv cross-linked polyethylene insulated submarine cable. 

It is an important part of the 500kv power transmission project, which includes building two 380-meter-high power transmission towers in Zhoushan, the highest of their kind in the world, and stringing a 34km wire, apart from laying the cable. 

The project, worth 4.8 billion yuan ($700 million), is the largest and most difficult cross-sea power transmission project in the history of the State Grid Zhejiang, and will increase electricity supplies for the China (Zhejiang) Pilot Free Trade Zone in Zhoushan.

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One of the two 380-meter-high power transmission towers (red) under construction in Zhoushan [Photo/zj.zjol.com]