Journal of the Computational Structural Engineering Institute of Korea (한국전산구조공학회논문집)

Computational Structural Engineering Institute of Korea (한국전산구조공학회)
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Seismic and Stress Analysis of 72.5kV GIS for Technical Specification of KEPCO

72.5kV GIS 전력 장비의 KEPCO 기준 내진 및 응력 해석

  • Received : 2017.01.31
  • Accepted : 2017.04.24
  • Published : 2017.06.30
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Abstract

High voltage electric power transmitter GIS(Gas Insulated Switchgear) above 72.5kV needs to satisfy domestic Korean peninsular standard(ES-6110-0002) in KEPCO with respect to normal and special operation conditions which include internal gas pressure, dead weight, wind and seismic load. Some other requirements not described in Korean standard can be applied from other international standards such as IEC(International Electronical Committee) 62271-203 and 62271-207. The GIS is a kind of pressure vessel structure made of aluminum and filled with SF6 gas of internal pressure 0.4~0.5MPa. Finite element analysis of GIS is performed with such operational loads including seismic loading and the stability and reliability is determined according to ASME BPVC(Boiler and Pressure Vessel Code) SEC. VIII standard where the allowable stress level of the pressure vessel is suggested. The result shows that the stress of GIS is satisfied the allowable stress level and the safety factor is about 2.3 for Korean peninsular standard.

국내의 72.5kV 이상, 주파수 60Hz의 송배전설비인 옥내 및 옥외용 가스절연개폐장치(GIS)는 내진 안전성에 대해 국가에서 정한 한전표준규격(ES-6110-0002)을 만족해야 한다. 이 규격에서 명시되지 않은 사항은 IEC 62271-203, 62271-207 등의 관련 기기 규격에 준한다. 한전표준규격에서 기기는 정상사용상태와 특수사용상태에서 건전성이 유지되어야 한다. 안전성 판단을 위해 ASME BPVC SEC.VIII 내압용기 설계 기준에 의해 A6061-T6 재질의 GIS에 대한 정상사용상태 기준과 국내 한전표준규격과 국외 IEC 62271-207에 의한 특수사용상태 기준(지진)에 대한 총체적 응력상태를 판단하였다. 한전표준규격 기준(0.22g) 적용시, 최종응력이 알루미늄인 Part A는 78.2MPa, Part D2의 경우 102.3MPa로, ASME 허용응력 값 181.5MPa를 만족하고 있다. IEC 62271-207 High 0.5g의 경우에도 최종응력은 Part A는 90.5MPa, Part D2는 103.8MPa이다. 본 연구 결과, 72.5kV GIS는 한전표준규격의 구조안전성과 내진성능을 충분히 만족함을 보이고 있다. 내진해석으로 내진시험을 수행할 수 없는 대형 전력기기의 내진성능 실증에 활용될 수 있을 것으로 기대된다.

Keywords

References

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