The construction of the 500-kilovolt (kv) ultra-high voltage submarine cables laid beneath the Zhoushan Strait in eastern China's Zhejiang province was completed on June 2, which is expected to further promote the development of the local economy, sources said recently.
Linking the power grids between Zhoushan and Ningbo cities in the province, the 17-kilometer cable is the first domestically-made 500kv submarine cable, and also the world's first 500kv cross-linked polyethylene insulated submarine cable, which is more safe and eco-friendly.
To lay the submarine cables, the State Grid Corporation specially built China's first workboat which is able to load cables weighing 5,000 tonnes. With completely independent intellectual property rights, the boat can lay and maintain cables and operate as normal in a violent storm, sources said.
In addition to the submarine cables, the 500kv power transmission project also includes building two 380-meter-high power transmission towers in Zhoushan, the highest of their kind in the world.
Zhoushan is the last city in Zhejiang province that doesn't have the 500kv power transmission lines. When this project is put into operation, the days when Zhoushan only has the 220kv grid frame will be history and it will greatly boost the development of the local economy, sources noted.
Source:sxcoal
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