Cross-linked polyethylene insulated DC submarine cables are mainly used in DC transmission systems with VCS commutation technology. As system line power transmission carriers, they are mainly used in industrial power generation demonstration projects, offshore wind power generation, grid interconnection of different AC systems, and islands. And undersea power transmission between continents, capacity expansion of coastal cities, large offshore oil and gas platforms, etc.
CIGRE TB 496 《Recommended Test Methods for DC Extruded Cable Systems with Rated Voltage 500kV and Below》
IEC 62895 《Test methods and requirements for DC transmission extruded insulated power cables and accessories with rated voltage 320kV and below》
TICW7 《Technical Specifications for DC Transmission Extruded Insulated Power Cable Systems with Rated Voltage 500kV and Below》
GB/T 31489 《Direct current transmission extruded insulated power cable system with rated voltage 500kV and below》
The structural design of submarine cables does not completely refer to international standards. The design of submarine cable products is based on the first premise of meeting engineering needs, and is designed according to its routing environmental parameters and work requirements, taking into account the electrical, thermal, optical, mechanical, and Water-blocking performance requirements, special engineering through full performance evaluation verification of type testing to ensure long-term reliable operation of the product.
1、The system does not require polarity reversal to change the direction of current transmission;
2、Submarine cables operate in a bipolar mode, with one pole being the positive pole and the other the negative pole;
3、Cross-linked polyethylene insulated submarine cables operate at high temperatures and have superior electrical and mechanical properties;
4、Can carry out large-capacity power transmission of thousands of kilometers and gigawatts;
5、It is environmentally friendly and does not have the oil leakage and aging defects of traditional oil-paper insulated DC submarine cables.
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