Hangzhou completed the laying of the longest single-section 220kV land cable in China
Time of issue:
2022-02-27
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It is understood that the project is an important energy artery of Zhejiang Chengxi Science and Technology Innovation Corridor. After completion, it will provide a stable energy supply for innovative technology industry demonstration blocks such as West Lake University, West Lake Science and Technology Economic Park, and Yungu Town.
Nowadays, in order to solve the contradiction between urban construction and electric power construction, transmission lines are gradually shifting from overhead laying to underground cable laying, and large-capacity, long-distance, large-section cable projects are increasing day by day. Mao Wei, general manager of the Zijingang Tunnel Project of the State Grid Hangzhou Power Supply Company, introduced that due to the short length of the traditional cable design segment, usually around 500 meters, the number of cable joints has increased sharply, and the project investment has also increased. At the same time, the increase in the number of connectors leads to a corresponding increase in the probability of cable failures.
The reporter learned that long-distance single-segment cables require relatively flat terrain and straight paths. The tunnel between wells G1-G6 in this project is the only long-distance horizontal section of the project. The distance between the firewalls on both sides of the two pipe jacking wells is 1760 meters, and a space of about 30 meters is reserved on both sides to make joints. Special cable with a length of 1715 meters.
In order to ensure that this special cable is transported into the tunnel, State Grid Hangzhou Power Supply Company customized a cable reel with a diameter of 7.8 meters, transported the cable reel with a total weight of more than 90 tons through a special flatbed truck, and formulated a special cable reel hoisting plan, using two cranes Synchronized work together.
technology,University,Economic
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