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Prevention of reignition overvoltages by phase-angle-controlled switching of a gas circuit breaker at shunt reactor current interruption |
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| Authors: | Yoshifumi Yamagata Tsutomu Kumagai Susumu Nishiwaki Hiroaki Toda Masayuki Ishikawa Takeshi Yokota |
| Affiliation: | 1. Tokyo Electric Power Company Yoshifumi Yamagata obtained a Master's degree in 1978 in Electrical Engineering from Yokohama National University, and joined Tokyo Electric Power Co. in April of the same year. Since then he has been engaged in construction of substations as well as development and maintenance of substation apparatus.;2. Tokyo Electric Power Company Tsutomu Kumagai completed the first half of the doctoral program in Electrical Engineering at Waseda University in March 1985, and joined Tokyo Electric Power Co. in April of the same year. He has been engaged mainly in the development of switching apparatus since then.;3. Toshiba Corporation Susumu Nishiwaki graduated in March 1969 from the School of Engineering, Yokohama National University, and joined Toshiba Corporation in April of the same year. He also has a Dr. of Eng. degree. He is engaged in research and development on lightning arrester, switching and protective equipment, and surge phenomena. He received a Paper Award of the I.E.E., Japan, in 1985. He is a member of IEEE.;4. Toshiba Corporation Hiroaki Toda obtained a Master's degree in 1973 from Doshisha University and joined Toshiba Corporation in April of the same year. He is engaged mainly in development and design of gas circuit breakers.;5. Toshiba Corporation Masayuki Ishikawa obtained a Dr. of Eng. degree in March 1981 from Keio University, and joined Toshiba Corporation in April of the same year. Since then he has been engaged in development of interruption phenomena and apparatus of SF, gas circuit breakers. He is a member of IEEE.;6. Toshiba Corporation Takeshi Yokota obtained a Master's degree in 1982 in Electrical Engineering from Yokohama National University, and joined Toshiba Corporation in April of the same year. Since then he has been engaged in system engineering and development work of transmission and substation apparatus. |
| Abstract: | Shunt reactors installed at gas-insulated switchgear substations (GIS-substations) are switched relatively frequently by large-capacity gas circuit breakers (GCBs). Surge voltages appear at such switching operations through various mechanisms. Among them, high-frequency current interruption and subsequent multiple reignition might cause the highest overvoltage and may be harmful to the insulation of the components of the substation. In this paper, shunt reactor current-interrupting tests are conducted in high-power laboratory. The existence of critical arcing time above which reignitions never occur is shown through these tests. From this fact, a phase-angle-controlled-interruption system is proposed. With this system, arcing time is set artificially so that reignitions should be prevented. The reliability of this system is confirmed through the reactor current-interrupting test in the laboratory as well. Afterward the phase-angle-controlled-interruption system is applied to the shunt reactor switching at an actual 275-kV substation. The switching performance of this system is measured over three months. Reignition-free interruption is shown to be attained with this system. |
| Keywords: | Small lagging current interruption gas circuit breaker shunt reactor reignition of arc high-frequency extinction of arc contact-opening phase control |