Sumitomo Electric has contracted with the Korean Electric Power Company (KEPCO) to construct a complete 100 meter HTS cable system in Korea. The system delivers 22.9kV and 1250A capacity, which is 5 times as conventional Korean distribution line, through 100 meters of cable. Featuring 3-in-One HTS cable. Stirling (papa werk) supplied the LN2 cooling system.
The 100 meter underground cable is scheduled for installation at the Gochang KEPRI test site, as shown below.
LS Cable (Chairman & CEO Christopher Koo) announced on the 13th that the company has succeeded in developing a superconducting cable terminal for 154kV transmission, the world’s highest level. The cable takes advantage of the fact that electrical resistance approaches ‘0’ (zero) at temperatures of -196°C or lower. The terminal is designed specifically for connecting superconducting cable, which is capable of effective large-capacity transmission to the existing power grid. Therefore, superconducting cable terminals are one of the core devices necessary for implementing a superconducting transmission network.
Superconducting cables and terminals use liquid nitrogen as a refrigerant to achieve superconductivity. The terminal recently developed by LS Cable consists of three elements; an extreme low-temperature component, a temperature distribution component and an ambient temperature component. Therefore, the unit is characterized as having maximized thermal efficiency and minimized power. Furthermore, this product was specifically designed to effectively link with the existing electric power grid providing for convenient installation.
It is crucial that the quality of the superconducting cable terminal be ensured to maintain stable performance even at high voltage. In addition, as liquid nitrogen is used as the main insulating material, a superconducting cable terminal requires composite technology to establish a structure which is strongly resistant to thermal shock and is mechanically stable. LS Cable’s transmission cable has proven that it can withstand a voltage surge (ref: Terminologies) of ±900kV or higher at a product performance test, an achievement that demonstrates once again the technological superiority of LS Cable in terms of withstanding voltage shocks.
LS Cable’s Managing Director Wan-ki Park of Technological Development said, “With this development, LS Cable has secured the foundation to implement the world’s highest level superconducting system.” He added, “We are planning to continuously promote technological development in order to maintain our leading position in the global superconducting cable market with high growth potential in the future.”
Superconducting cable is forecast to be widely deployed to continental backbone line implementation centering on the U.S. which constitutes a market worth several trillion KRW annually. France, China, Russia and Japan, etc. are also accelerating R&D for transmission level development. In particular, a test bed project initiated in Korea by KEPCO (as part of a government-sponsored research project) applying superconducting cables to the power system at the Icheon substation is in progress. LS Cable is supplying the superconducting cables.
Since commencement of superconducting cable development in 2000, LS Cable has embarked upon superconducting cable system development in full scale through the DAPAS (Dream of Advanced Power Systems by Applied Superconductivity Technologies) project initiated in 2001. In 2006, LS Cable succeeded in developing a superconducting cable system for 22.9kV 50MVA power distribution. Stability of the product has been validated through type tests and a long-term reliability assessment conducted for over two years by the KEPCO Gochang Power Testing Center.
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