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Tan Delta 측정을 이용한 유침 절연지의 열화특성 분석

Analysis of Degradation Characteristics for Oil-Paper Insulation using Tan Delta Measurement

  • Kim, Jeong-Tae (Dept. of Electrical Engineering, Daejin University) ;
  • Kim, Woo-Bin (Dept. of Electrical Engineering, Daejin University)
  • 투고 : 2016.07.03
  • 심사 : 2016.08.12
  • 발행 : 2016.09.01

초록

In this study, in order to understand the degradation characteristics of oil-paper insulation for power transformers and OF cables, tan delta was measured using cable model specimens with long-term accelerated thermal and electrical aging. In addition, to find out the degradation level due to the accelerated aging, tensile strengths of aged papers were measured. As a result, tan ${\delta}$ showed the characteristics of slight decrease at the first stage and then increase with the aging time, which could be analyzed due to the evaporation of remaining moisture and the change of aging rate with time. Also, the trend of tensile strengths with aging temperature and time was appeared to be exponentially decreased and by use of these data equivalent calculated lifetimes and accelerated aging factors were derived for each aging temperatures. After then, tan ${\delta}$ was analyzed with the equivalent operating years. For all different aging temperatures, the aged data were very well fit to the equivalent operating years and it is shown that tan ${\delta}$ was increased with the decrease of tensile strength.

키워드

참고문헌

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