China's first 10-kilovolt, 400-meter triple-phase co-axial high-temperature AC superconducting cable was laid in Shenzhen, southern China, on July 28, providing a new solution to the problem of power supply in high-load-density areas of mega-cities, SZnews.com reported on Wednesday.

This marks another important development in the world's first superconducting cable demonstration project for high-load density power supply areas, laying a solid foundation to achieve production within the year, the report said.

The 10-kilovolt superconducting cable, developed by the Shenzhen Power Supply Bureau, connects the 220-kilovolt Binhe Station and the 110-kilovolt Xinghe Station in central Futian, Shenzhen, and will supply power to important loads such as Shenzhen's landmark Ping An Building.

The transmission capacity of a superconducting cable is much larger than that of a conventional cable. The power transmission capacity of a 10 kV superconducting cable is larger than that of a conventional 110 kV cable, but the transmission loss is only 1/4 to 1/5 of that of conventional cable.

The superconducting cable is very suitable for power supply in high-load density areas, but the project is extremely difficult to implement. The superconducting cable was laid through roads, urban metro areas, and core business districts, and the laying environment was narrow, the report said.

To ensure the successful completion of the laying, the Shenzhen Power Supply Bureau superconducting cable project team has conducted dozens of field surveys and seminars over the past three months and developed a special attack plan.

Next, the project will enter the installation and test commissioning phase of superconducting cable accessories and supporting cryogenic refrigeration system, measurement, and control protection system.

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