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배전 변압기의 통계적 기대 수명 평가 및 초기 고장제거 적정성 검토
조종은,김상봉,이온유,김강식,Chong-Eun, Cho,Sang-Bong, Kim,On-You, Lee,Kang-Sik, Kim 한국전력공사 2022 KEPCO Journal on electric power and energy Vol.8 No.2
Recently, the amount of maintenance is increasing due to the aging of power facilities, but the budget is constrained. Therefore, the importance of asset management that selects replacement priorities based on the failure probability and enhances investment effects is increasing. Because the number of distribution transformers is very large, the proportion of investment cost is very high. Therefore, it is important to select the investment priority by evaluating the reliable remaining life based on the failure probability. This paper evaluates the statistical expected life using the failure data of distribution transformers for the last 11 years and the current operation data. The hazard rate of distribution transformer and MV cable was compared with each other and the adequacy of early failure removal was reviewed and the statistical expected life corresponding to the cumulative failure probability B3% was calculated.
지중 배전용케이블 고장통계 분석 및 고장률 활용 진단대상 우선순위 선정방법
조종은,이온유,김상봉,김강식,Cho, Chong-Eun,Lee, On-You,Kim, Sang-Bong,Kim, Kang-Sik 한국전력공사 2021 KEPCO Journal on electric power and energy Vol.7 No.2
This paper statistically analyzes the time required for each failure cause and describes a diagnostic method for 159 reports of failure analysis of MV cables that occurred in the distribution system of KEPCO over the past 18 years. In addition, the manufacturer's failure rate compared to 100C-km was calculated using 381 cases of MV cable deterioration failure between 2008 and 2020. It is hoped that this paper will help those in charge of maintaining underground facilities at the business office to use the failure rate to prioritize facility diagnosis.
조종은,이온유,김상봉,김강식,Chong-Eun, Cho,On-You, Lee,Sang-Bong, Kim,Kang-Sik, Kim 한국전력공사 2022 KEPCO Journal on electric power and energy Vol.8 No.2
In this paper, the change history of various types of MV (Medium Voltage) cables was investigated. In addition, the statistical life expectancy of each type was calculated by using the operation data and the failure data. For cut-off year, 10 years was applied, and realistically applicable statistical life expectancy was calculated by correcting the cause of failure entered by mistake. The life expectancy of FR-CNCO-W was calculated as 51.2 years, CNCV-W 38.1 years, and CNCV 31.4 years and the overall average is 33.8 years. Currently, the life expectancy of TR CNCV-W is 29.4 years, but it is estimated that the lifespan will be extended if failure data is accumulated. As a result, it is expected that life expectancy results can be applied to Asset Management System (AMS) in the future.