电压稳定剂及其含量对高压直流用500kVXLPE电缆材料绝缘性能的影响

doi:10.19595/j.cnki.1000-6753.tces.220845

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Abstract This paper studies the effects of voltage stabilizer and its content of 4-n-propylbenzoic acid on the insulation properties of the cross-linked polyethylene (XLPE) material used for 500kV HVDC cable. The XLPE specimens with voltage stabilizer content of 0%, 1%, 3% and 5% were prepared by solution blending and hot pressing methods. Then the space charge, DC conductivity, DC breakdown, dielectric properties, mechanical properties, and differential scanning calorimetry were tested on the specimens. The results show that the addition of the voltage stabilizer can inhibit the accumulation of space charge, reduce the DC conductivity and improve the lifetime index of insulation. In contrast, the DC breakdown strength and lifetime index of the XLPE specimen with 1% voltage stabilizer content are the highest. With the increase of voltage stabilizer content, the DC breakdown strength of the specimen first increases and then decreases, while the relative permittivity and the dielectric loss gradually increase, and the effect of frequency on the relative dielectric constant of the material is noticeable. Moreover, the mechanical properties and crystallinity of the specimens show the opposite trend. Quantum chemical calculations show that compared with XLPE, the voltage stabilizer has positive electron affinity energy and a narrower molecular band gap. At the same time, the polarity of voltage stabilizer molecules is large, which is conducive to introducingtraps inside the specimen after addition, thus effectively improving the electrical properties of the cable insulation material.

Key words： Voltage stabilizer HVDC XLPE insulation properties quantum chemical calculation

Received: 18 May 2022

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TM211

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	Shi Yiwen
	Chen Xiangrong
	Meng Fanbo
	Hong Zelin
	Zhu Hanshan

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Shi Yiwen,Chen Xiangrong,Meng Fanbo等. The Effect of Voltage Stabilizer and Its Content on the Insulation Properties of 500kV HVDC Cable Insulation Materials[J]. Transactions of China Electrotechnical Society, 2022, 37(22): 5851-5861.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.220845 OR https://dgjsxb.ces-transaction.com/EN/Y2022/V37/I22/5851

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