Electrical treeing behaviors in silicone rubber under an impulse voltage considering high temperature

Yunxiao ZHANG (张云霄); Yuanxiang ZHOU (周远翔); Ling ZHANG (张灵); Zhen LIN (林臻); Jie LIU (刘杰); Zhongliu ZHOU (周仲柳)

doi:10.1088/2058-6272/aaa88a

Plasma Science and Technology > 2018 > 20(5): 54012-054012. > DOI: 10.1088/2058-6272/aaa88a

Yunxiao ZHANG (张云霄), Yuanxiang ZHOU (周远翔), Ling ZHANG (张灵), Zhen LIN (林臻), Jie LIU (刘杰), Zhongliu ZHOU (周仲柳). Electrical treeing behaviors in silicone rubber under an impulse voltage considering high temperature[J]. Plasma Science and Technology, 2018, 20(5): 54012-054012. DOI: 10.1088/2058-6272/aaa88a

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Electrical treeing behaviors in silicone rubber under an impulse voltage considering high temperature

1 The State Key Laboratory of Power System, Department of Electrical Engineering, Tsinghua University, Beijing 100084, People’s Republic of China 2 State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, Xi’an 710049, People’s Republic of China 3 School of Electrical Engineering, Zhengzhou University, Zhengzhou 450001, People’s Republic of China

Funds: This work was supported in part by National Basic Research Program of China (973 Project)(No. 2014CB239501), National Natural Science Foundation of China (Nos. 51707100, 51377089), State Key Laboratory of Electrical Insulation and Power Equipment (No. EIPE16208), and China Postdoctoral Science Foundation (No. 2016M591176).

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Received Date: October 28, 2017

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Abstract

In this paper, work was conducted to reveal electrical tree behaviors (initiation and propagation) of silicone rubber (SIR) under an impulse voltage with high temperature. Impulse frequencies ranging from 10 Hz to 1 kHz were applied and the temperature was controlled between 30 °C and 90 °C. Experimental results show that tree initiation voltage decreases with increasing pulse frequency, and the descending amplitude is different in different frequency bands. As the pulse frequency increases, more frequent partial discharges occur in the channel, increasing the tree growth rate and the final shape intensity. As for temperature, the initiation voltage decreases and the tree shape becomes denser as the temperature gets higher. Based on differential scanning calorimetry results, we believe that partial segment relaxation of SIR at high temperature leads to a decrease in the initiation voltage. However, the tree growth rate decreases with increasing temperature. Carbonization deposition in the channel under high temperature was observed under microscope and proven by Raman analysis. Different tree growth models considering tree channel characteristics are proposed. It is believed that increasing the conductivity in the tree channel restrains the partial discharge, holding back the tree growth at high temperature.
- silicone rubber,
- electrical tree,
- impulse voltage,
- temperature,
- frequency,
- growth rate

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References

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Electrical treeing behaviors in silicone rubber under an impulse voltage considering high temperature