期刊
POLYMERS
卷 13, 期 16, 页码 -出版社
MDPI
DOI: 10.3390/polym13162746
关键词
bipolar charge transport; breakdown; molecular chain displacement; space charge; threshold energy
资金
- National Research Foundation of Korea (NRF) - Korea government (MSIT) [2020R1A2C2013311]
- National Research Foundation of Korea [2020R1A2C2013311] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
The study analyzed the impact of accumulated space charge on electric field distortion and breakdown strength in polymeric insulators in an HVDC environment using a bipolar charge transport model. It was found that temperature gradient accelerates the reduction of breakdown strength, and internal energy imbalance caused by polarity-reversal voltage significantly decreases breakdown strength.
In an HVDC environment, space charge accumulated in polymeric insulators causes severe electric field distortion and degradation of breakdown strength. To analyze the breakdown characteristics, here, the space charge distribution was numerically evaluated using the bipolar charge transport (BCT) model, considering the temperature gradient inside the polymeric insulator. In particular, we proposed an electro-mechanical threshold energy condition, resulting in the modified molecular chain displacement model. The temperature gradient accelerates to reduce the breakdown strength with the polarity-reversal voltage, except during the harshest condition, when the temperature of the entire polymeric insulator was 70 degrees C. The energy imbalance inside the insulator caused by polarity-reversal voltage reduced the breakdown strength by 82%. Finally, this numerical analysis model can be used universally to predict the breakdown strength of polymeric insulators in various environments, and help in evaluating the electrical performance of polymeric insulators.
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