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논문 기본 정보

자료유형
학술저널
저자정보
Thomas Tsuma Kalenga (KEPCO International Nuclear Grduate School (KINGS)) Choong-koo Chang (KEPCO International Nuclear Grduate School (KINGS))
저널정보
대한전기학회 전기학회논문지 전기학회논문지 제70권 제2호
발행연도
2021.2
수록면
297 - 304 (8page)
DOI
10.5370/KIEE.2021.70.2.297

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초록· 키워드

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Several failures of the surge arresters in nuclear plants during normal power operation caused ground fault relay (GFR) to trip and shut down the reactor coolant pump (RCP). Furthermore, several false trips of the GFR were reported between 2004 and 2018. This was assumed to have been caused by vacuum circuit breaker (VCB) switching surges. This paper sought to establish the expected switching surges in this network, how safe it is to operate the reactor coolant pump motor (RCPM) without a surge arrester (SA), establish the cause of the false operation of the ground fault relay, and ways to mitigate against it. It turns out that the VCB switching surges are within the RCPM insulation rating. The GFR activation was not caused by the residual current I<SUB>0</SUB> created by the VCB switching surges. The SA should be removed from the circuit until a SA monitoring scheme is put in place.

목차

Abstract
1. Introduction
2. Trip of RCP Motors by Ground Fault Relay
3. Characteristic of Ground Fault Relay and Surge Arrester
4. Coping RCP Trip by Ground Fault Relay
5. VCB Switching Surge Simulation and Basic Insulation Impulse Level of RCP Motor Analysis
6. Simulation and Analysis Results and Discussion
7. Conclusion
References

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