Journal of the Earthquake Engineering Society of Korea (한국지진공학회논문집)

Earthquake Engineering Society of Korea (한국지진공학회)
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The Experimental Study on Seismic Capacity of 154 kV & 345 kV Main Transformer Bushings

154 kV 및 345 kV 주변압기 부싱의 내진성능 시험 연구

  • Hwang, Kyeong Min (Korea Electric Power Corporation, Research Institute) ;
  • Ham, Kyung Won (Korea Electric Power Corporation, Research Institute) ;
  • Kim, Gyeong Hwan (Korea Electric Power Corporation, Transmission Operation Department)
  • 황경민 (한국전력공사 전력연구원) ;
  • 함경원 (한국전력공사 전력연구원) ;
  • 김경환 (한국전력공사 송변전운영처)
  • Received : 2018.01.15
  • Accepted : 2018.02.14
  • Published : 2018.03.01
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Abstract

In this study, seismic performance of bushings and their connection parts was analyzed by performing shaking table tests for various types of bushings widely used as auxiliary equipment of main transformers in domestic substations. As a result of the seismic tests of five types of 154 kV bushings according to the manufacturers, all the bushings secured the structural integrity even at the acceleration of 1.4 g and it was found that leakage of insulating oil didn't occur. Also, the average acceleration amplification rate at the upper part of the bushings was about 2.5 to 3.0 times higher than the lower one. On the other hand, when a representative 345 kV bushing was subjected to the seismic test, the structural integrity was secured even at 1.0 g acceleration similar to the design earthquake load level, but in this test, leakage of insulating oil occurred. However, when a stiffener restricting the connection of the bushing is installed in the same 345 kV bushing, the displacement of the bushing connection is controlled and the stiffener prevent the oil from leaking even at the acceleration of the designed seismic level.

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References

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