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자료유형
학술저널
저자정보
Jian Li (Chongqing University) Yan Wang (Chongqing University) Lianwei Bao (Chongqing University)
저널정보
대한전기학회 Journal of Electrical Engineering & Technology Journal of Electrical Engineering & Technology Vol.9 No.3
발행연도
2014.5
수록면
957 - 963 (7page)

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Converter transformers play important roles in high-voltage direct current transmission systems. This paper presents experimental and analysis results of the combined electrical and thermal aging of oil-impregnated paper at pulsating DC voltages. Breakdown voltages and time-tobreakdown of oil-paper specimens were measured by using short-time and constant-stress tests. The breakdown characteristics of combined electrical and thermal aging on insulation system were discussed. According to the relationship between failure time and aging temperature, the twoparameter Weibull model was improved. On the basis of the competing risk algorithm and the improved Weibull model, the two factors failure model was calculated. And the influence of temperature in the insulation system has been analyzed. This model performs better than the twoparameter Weibull model when both time and temperature are considered as variables in estimating the lifetime of oil-paper insulation.

목차

Abstract
1. Introduction
2. Experiments
3. Breakdown Voltage of Oil-paper Insulation
4. Weibull Distribution of Constant-stress Test Data
5. Two Factors Failure Models Based on Competing Risks
6. Conclusion

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UCI(KEPA) : I410-ECN-0101-2015-500-001462699