Journal of the Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회논문지)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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Design and Fabrication of an Electronic Voltage Transformer (EVT) Embedded in a Spacer of Gas Insulated Switchgears

가스절연개폐장치의 스페이서 내장형 전자식 변압기의 설계 및 제작

  • Lim, Seung-Hyun (Department of Electrical and Electronics Engineering, Korea Maritime and Ocean University) ;
  • Kim, Nam-Hoon (Department of Electrical and Electronics Engineering, Korea Maritime and Ocean University) ;
  • Kim, Dong-Eon (Department of Electrical and Electronics Engineering, Korea Maritime and Ocean University) ;
  • Kim, Seon-Gyu (Department of Electrical and Electronics Engineering, Korea Maritime and Ocean University) ;
  • Kil, Gyung-Suk (Department of Electrical and Electronics Engineering, Korea Maritime and Ocean University)
  • 임승현 (한국해양대학교 전기전자공학과) ;
  • 김남훈 (한국해양대학교 전기전자공학과) ;
  • 김동언 (한국해양대학교 전기전자공학과) ;
  • 김선규 (한국해양대학교 전기전자공학과) ;
  • 길경석 (한국해양대학교 전기전자공학과)
  • Received : 2022.02.21
  • Accepted : 2022.03.16
  • Published : 2022.07.01
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Abstract

Bulky iron-core potential transformers (PT) are installed in a tank of gas insulated switchgears (GIS) for a system voltage measurement in power substations. In this paper, we studied an electronic voltage transformer (EVT) embedded in a spacer for miniaturization, eco-friendliness, and performance improvement of GIS. The prototype EVT consists of a capacitive probe (CP) that can be embedded in a spacer and a voltage Follower with a high input and a low output impedance. The CP was fabricated in the form of a Flexible-PCB to acquire the insulation performance and to withstand vibration and shock during operation. Voltage ratio of the prototype EVT is about 42,270, and the frequency bandwidth of -3 dB ranges from 0.33 Hz to 3.9 MHz. The voltage ratio error evaluated at about 6%, 12% and 18% of the rated voltage of 170 kV was 0.32%, and the phase error was 12.9 minutes. These results were within the accuracy for the class 0.5 specified in IEC 60044-7 and satisfy even in ranges from 80% to 120% of the rated voltage. If the prototype EVT replaces the conventional iron-core potential transformer, it is expected that the height of the GIS could be reduced by 11% and the amount of SF6 will be reduced by at least 10%.

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Acknowledgement

본 연구는 2022년도 산업통상자원부(MOTIE) 및 한국산업기술평가관리원(KEIT)의 지원을 받아 수행한 연구입니다 (No.20010965).

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