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.

A B S T R A C T
 1. 서 론
 2. 시험목적 및 방법
  2.1 시험대상 및 목적
  2.2 시험방법
  2.3 시험설비
  2.4 입력운동
 3. 154 kV 부싱의 내진시험 결과
  3.1 가진 가속도 계측결과
  3.2 내진시험 결과
  3.3 부싱 연결부 변위계측 결과
  3.4 공진탐색 시험 결과
 4. 345 kV 부싱의 내진시험 결과
  4.1 가진 가속도 계측결과
  4.2 내진시험 결과
  4.3 공진탐색 시험 결과
 5 결 론
 REFERENCES

• 황경민(한국전력공사 전력연구원) | Hwang, Kyeong Min Corresponding author
• 함경원(한국전력공사 전력연구원) | Ham, Kyung Won
• 김경환(한국전력공사 송변전운영처) | Kim, Gyeong Hwan