World's First 35kV Superconducting Cable Passes Heavy Load Test

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The 29 of July, Shanghai Electric Power Company organized a large load test on 35kV superconducting cable. Via 9 continuous hours of operation with a high load current of more than 1000A and a maximum of 1289A, it was initially verified that this cable has the ability to work with large loads.

in december 2021, The commissioning ceremony of the world's first 35kV superconducting cable project was held, independently developed by the Shanghai Cable Research Institute in its core technology.

The demo project, with a total line length of 1,2 km, It is the first project of power transmission superconducting conductor built by State Grid in China. This power cable is currently the highest transmission capacity 35kV superconducting cable, largest length and fully commercialized in the world.

in august this year, this 35kV superconducting cable has been in continuous and stable operation for more than seven months. Its daily operating load is stable in the range of 700 a 800 A. This is a large margin on the design capacity of up to 2200A with load.

To unleash the ability of the superconducting cable system, test the working status of the superconducting cable during heavy loads and evaluate the power consumption level of the system, State Grid Shanghai Power Supply Company conducts this test during the peak load period of summer.

During the 9 test hours, superconducting cable performance data was normal and stable. in daily operation, The carrying capacity of superconducting cables is equivalent to that of 4 ó 5 ordinary cables of the same voltage class. Under heavy load conditions, equals between 7 Y 10 ordinary wires. Through the superconducting cable, the power transmission needs of small size and large capacity of the network of the big city can be solved..

To ensure the smooth running of this test, Shanghai Power Supply Company prepared a detailed plan and risk response measures, refining the content of the control parameters and the personnel program.

During the test day, site staff systematically recorded stress data, current and power of the power supply refrigeration system superconducting wire.

Through data comparison, the data of losses of the refrigeration system under a great load were obtained, providing a baseline of parameters to further improve your operating economy.

At the same time, the company's wiring professionals made dynamic temperature measurements at the terminals on both sides of the superconducting cable. By collecting data on equipment heat generation under different loads and at different ambient temperatures, plotted trends of temperature change. This provides a reference for point adjustment of the power of the cooling system..