电声脉冲法研究热老化对160kV直流电缆绝缘材料陷阱特性的影响

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Abstract The ageing of XLPE insulation can cause the change of trap energy properties, and further affect the distribution of space charge in the bulk of insulation. It would threaten the security of HVDC. In this paper, the slices from a 160kV DC cable were stressed at 90℃ and 135℃, respectively. The space charge distributions of the samples were measured by the pulsed electro-acoustic (PEA) method. And then the space charge decay model was established. Combined with the isothermal relaxation theory, a method to analyze the trap energy properties of the insulation materials based on the PEA method was proposed. The results showed that due to the post-crosslinking in the 90℃ thermal process, parts of the deep electron traps were converted to shallow traps, which would benefit the dissipation of the space charge. However, as the aging time further increased, the density and level of the electron traps both had a certain degree of growth, resulting in the increase of the amount of space charge. Under the 135℃ thermal stress, not only the crystalline morphology of the XLPE is greatly destroyed, but also the density and depth of the electron traps increased greatly because of the intense thermal oxidative degradation in the XLPE insulation.

Key words： HVDC cable, space charge, thermal stress, isothermal relaxation theory, electron traps

Received: 18 April 2016 Published: 03 January 2017

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TM215

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	Liu Yunpeng
	Liu Hechen
	Gao Lijuan
	Li Yanda

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Liu Yunpeng,Liu Hechen,Gao Lijuan等. Influence of Thermal Stress on the Traps Energy Properties of 160kV HVDC Cable Insulation Material Based on Pulsed Electro-Acoustic Method[J]. Transactions of China Electrotechnical Society, 2016, 31(24): 105-112.

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https://dgjsxb.ces-transaction.com/EN/ OR https://dgjsxb.ces-transaction.com/EN/Y2016/V31/I24/105

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