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| Regulation of DC Electric Field Distribution within Insulation Via Positive Temperature Coefficient Material |
| Zhou Wenjun1, Teng Chenyuan1,2, Zhou Yuanxiang1,2,3, Zhang Ling2, Zhang Yunxiao2 |
1. School of Electrical Engineering and Automation Wuhan University Wuhan 430072 China;
2. State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment Department of Electrical Engineering Tsinghua University Beijing 100084 China;
3. The Wind Solar Storage Division of State Key Laboratory of Power System and Generation Equipment School of Electrical Engineering Xinjiang University Urumqi 830047 China |
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Abstract Negative temperature coefficient (NTC) electrical resistivity of insulating materials causes the distortion of DC electric field, increasing the design difficulty of HVDC equipment. The ceramic (0~35%) with positive temperature coefficient (PTC) electrical resistivity was doped into epoxy resin to weaken its temperature dependence of electrical resistivity (0~35%). Thermal conductivity, electrical resistivity-temperature characteristics and DC breakdown strength were tested. The electric field and temperature distribution under temperature gradient were simulated. The higher doping of PTC filler has a better electric field distribution. As for epoxy composite with 20% filler, the thermal conductivity increases by 66% and the radial temperature gradient decreases by 55%; the NTC effect weakens and the activation energy decreases by 35%; the maximum distortion of electric field decreases by 58%, while the DC breakdown strength only decreases by 16%. The PTC effect of fillers mitigating the decline of electrical resistivity with temperature coupled with decreased hot-spot temperature suppresses the distortion of electric field. The optimization of electric field distribution within insulation via PTC materials/epoxy composites has potential to be used in HVDC electrical equipment.
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Received: 17 April 2020
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2021, Vol. 36 
