조명전기설비학회논문지 (Journal of the Korean Institute of Illuminating and Electrical Installation Engineers)

  • 제24권9호
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  • Pages.150-158
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  • 2010
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  • 1229-4691(pISSN)
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  • 2287-5034(eISSN)
한국조명전기설비학회 (The Korean Institute of IIIuminating and Electrical Installation Engineers)
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345[kV] 주변압기 3차측 영상전압 발생원인 분석 및 대책에 관한 연구

A Study on the Occurrence Cause of the Zero Sequence Voltage at Tertiary Side of 345[kV] Main Transformer

  • 투고 : 2010.07.22
  • 심사 : 2010.08.05
  • 발행 : 2010.09.30
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초록

We had experienced the several system failures which were concerned about zero sequence voltages at the tertiary side of 345[kV] transformers. In this paper, we had considered the zero sequence voltage and its reduction methods at the 345[kV] auto-transformer tertiary. For analysis, we used EMTP(Electro-Magnetic Transients Program). The calculation results by EMTP were compared with the measured data of the field tests. From the calculation and the field tests, we had verified that it is due to pre-saturation characteristics of the potential transformer. So, we had improved its saturation characteristics and applied it at real site. After improvements, we could reduce the zero sequence voltage below the setting level of the relay.

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참고문헌

  1. 오세일 외, "345[kV] Auto Tr 3차측 설비고장에 대한 대책 수립 T/F 활동 최종보고서", 한전전력연구원, 2009.12.
  2. 우정욱 외, "EMTP를 이용한 345[kV] 단권변압기 및 계기용 변압기의 상세 모델링 방법", 대한전기학회 하계학술대회, 2010.07.
  3. Afshin Rezaei-Zare, Reza Iravani, Majid Sanaye-Pasand, "An Accurate Hysteresis Model for Ferroresonance Analysis of a Transformer", IEEE Transactions on Power Delivery, Vol.23, No.3. pp.1448-1456, July 2008. https://doi.org/10.1109/TPWRD.2007.916225
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  6. R.F.Karlicek, E.R.Taylor, "Ferroresonance of Grounded Potential Transformers on Ungrounded Power Systems", AIEE, pp.607-614, August 1959. https://doi.org/10.1109/AIEEPAS.1959.4500391
  7. Lyle.L.Gleason, "Neutral Inversion of a Single Potential Transformer Connected Line-to-Ground on an Isolated Delta System", Transactions A.I.E.E., Volume 70, pp.103-111, 1951. https://doi.org/10.1109/T-AIEE.1951.5060375