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하체웅(Che-Wung Ha),이도환(Do-Hwan Lee) 대한전기학회 2015 전기학회논문지 Vol.64 No.2
On January 30, 2012 an auxiliary component of Byron Unit 2 was tripped on bus under voltage. The cause of the event was the failure of the C-phase insulator track for the Unit 2 station auxiliary transformer(SAT) revenue metering transformer. In addition to this event, other events have occurred at other plants resulting in an open-phase condition.[1] Therefore, Nuclear Regulatory Commission(NRC) has requested that not only nuclear power plant(NPP) operating company but also its Design Certification(DC) applicant have to prepare open-phase detecting system in their operating plants and design document. In this paper, various open-phase conditions are simulated in NPP using Electromagnetic Transient Program(EMTP) and Atpdraw, and open-phase condition detecting system is proposed for Main Transformer(MT), Unit Auxiliary Transformer(UAT) and SAT connected power line in NPP.
하체웅(Che-Wung Ha),주광호(Kwang-Ho Ju),임우상(Woo-Sang Lim) 대한전기학회 2011 전기학회논문지 Vol.60 No.8
Electric cables are one of the most important components in a nuclear power plant since they provide the power needed to operate electrical equipment. Despite their importance, cables typically receive little attention since they are considered passive, long-lived components that have been very reliable over the years when subjected to the environmental conditions for which they were designed. The operating experience reveals that a defect of the insulator or poor construction causes the initial failure of cable. However, the number of cable failures increase with plant aging, and these cable failures are occurring within the plants’ 40-year licensed period. These cable failures have resulted in plant transients, shutdown, loss of safety functions or redundancy, entries into limiting conditions for operation, and challenges for plant operators. Therefore, diagnosis of MV cable installed in NPPs has become one of the most urgent issues in recent years. In accordance with PSR, condition maintenance for cables is also continuously required. Recently, HFPD tests have been widely performed to diagnose cable in the transmission and distribution cable system. However, on-line HFPD wasn’t used in the NPPs because of the danger of plant shutdown, measurement sensitivity and application problems, etc. In this paper, HFPD measurement with portable device was performed to evaluate the integrity of the 4.16㎸ & 13.8㎸ cable lines. The test results show that HFPD is highly attractive to the diagnosis of MV cables in NPP by high detection sensitivity on-site.
하체웅(Che-wung Ha),주광호(Kwang-ho Joo),한성흠(Sung-heum Han) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
국내 원자력발전소에 설치되어 있는 고압케이블은 장기운전에 따라 열화진단 및 유지보수의 필요성이 증대되고 있다. 주기적 안전성 평가(Periodic Safety Review) 및 계속운전과 관련하여서도 고압케이블의 관리방안이 지속적으로 요구되고 있다. 본 논문에서는 원자력발전소에 설치되어 있는 13.8㎸ 및 4.16㎸급 고압케이블의 건전성을 확인하기 위하여 국내 최초 원자력발전소 운전 중 부분방전 진단을 수행하였고 추가로 열화상 측정을 통한 케이블 열화진단을 수행 하였다. 원자력발전소를 정지하지 않고 진단하는 운전 중 경년열화 진단 기술은 발전소 내 고압케이블 뿐만 아니라 향후 초고압케이블의 진단에도 적용하여 케이블 경년열화 진단을 주기적으로 수행할 경우 원자력발전소의 안정적 운영에 기여할 것으로 사료된다.