We began to develop HTS cables in 2001, and successfully carried out the live-grid operation in a transmission network at Puji substation on April 19, 2004. That represented the first live-grid operation of HTS cables in China.
This outdoor ac HTS cable system consists of three 33.5m cables, six terminations, a closed-cycle cryogenic station, and a control/protection setup. The warm dielectric (XLPE) cable system is rated 35kV and 2kA.
Pros of HTS cables:
1. With the same cross sectional area, HTS cables can generally carry three to five times current compared to conventional cables.
2. HTS cables produce no joule heat, and the ac loss is only about one tenth of the conventional cables’. The total transmission loss is far lower using HTS cables than using conventional cables even the operation energy consumption is counted.
3. HTS cables are environment-friendly by occupying less land and reducing pollution.
In addition, HTS cables improve the quality of electricity and enhance the reliability of power grids.
HTS cable applications in the near future:
1. Urban centers where conventional and overhead lines are rejected for environmental, aesthetic or safety reasons;
2. Metallurgy refineries or other large factories where energy loss is too high in using conventional bus for electric distribution;
3. Power plants and substations where transmission bus carries high current;
4. Rapidly growing big cities where the old cables can be replaced with HTS cables in the existing conduits.
In a long run, HTS cables may play an increasingly important role in long distance and high capacity transmission.
Superconducting power cables and buses that we can design, manufacture, and deliver per customer specifications are rated voltage up to 220 kV.
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