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Unformatted text preview: 554 IEEE TRANSACTIONS ON POWER DELIVERY, VOL. 20, NO. 2, APRIL 2005 Research on Insulation Design of 22.9-kV High- Superconducting Cable in Korea Young-Seok Kim, Dong-Soon Kwag, Hae-Jong Kim, Jeon-Wook Cho, Ki-Chul Seong, and Sang-Hyun Kim , Member, IEEE Abstract— The electrical insulation design is important for high-Tc superconducting (HTS) cable because the cable is op- erated in a medium voltage environment. For the insulation design of HTS cable, it is necessary to investigate the ac, impulse breakdown, and partial discharge inception stress of a liquid nitrogen/polypropylene laminated paper composite insulation system. These results were used to design the electrical insulation of 22.9-kV-class HTS cable in Korea and cable was manufactured. A manufactured mini-model HTS cable was evaluated for ac withstand voltage, impulse withstand voltage, breakdown and dielectric tangent loss (tan ) . From these tests, the cable has satisfied the standard technical specification of KEPCO in Korea. The breakdown voltage was 110 kV. Index Terms— AC withstand voltage, dielectric tangent loss, high-Tc superconducting (HTS) cable, partial discharge inception stress. I. INTRODUCTION T HE application of high-Tc superconductor (HTS) to power cable has been studied because HTS cable has a large cur- rent capacity, compact size and low ac losses. Some HTS cable systems have already been developed and evaluated –. KERI-LG is developing a 22.9-class HTS cable which is one of the 21st Century frontier projects in Korea , . The HTS cable system is composed of conductor, cooling system and electrical insulation. A study of electrical insulation is important to develop a HTS cable because the cable is oper- ated in a high voltage environment. The insulation of the HTS cable described in this paper used dielectric paper/liquid com- posite insulation, which is similar to the dielectric structure of oil filled (OF) cables , . In particular, the electrical break- down characteristics of dielectric paper, such as ac withstand voltage, impulse withstand voltage and partial discharge incep- tion stress, are necessary for the design of 22.9-kV-class HTS cable. Manuscript received June 5, 2003; revised May 3, 2004. This work was sup- ported in part by the Korea Ministry of Science and Technology. This work was supported by a grant from the Center for Applied Superconductivity Technology of the 21st Century Frontier R&D Program funded by the Ministry of Science and Technology, Republic of Korea. Paper no. TPWRD-00282-2003. Y.-S. Kim is with the Electrical Safety Research Institute, Korea Electrical Safety Corp. (KESCO), Gapyeong-gun 477-814, Korea (e-mail: athens9@han- mail.net)....
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