热老化对电压稳定剂改善交联聚乙烯绝缘性能的影响

doi:10.19595/j.cnki.1000-6753.tces.L90528

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摘要为了进一步提高交联聚乙烯（XLPE）的电气性能,该文选用间氨基苯甲酸作为电压稳定剂,用溶液法制备了质量分数为1%的XLPE共混物试样,并对试样进行加速热老化实验。利用空间电荷、电导率和表面电位衰减测量,研究了添加电压稳定剂和热老化前后材料的电气性能。通过试样在添加电压稳定剂与老化前后的电场和陷阱能级分布,分析了电压稳定剂以及热老化对试样内部陷阱的影响。结果表明,间氨基苯甲酸能够有效抑制XLPE中的空间电荷积聚,改善试样内部电场分布,同时降低试样的直流电导率。热老化后,试样内部出现了明显的空间电荷积聚,电场畸变明显,表面电位衰减速率下降,直流电导率有明显上升。由此可知,电压稳定剂的添加导致试样内部深陷阱和浅陷阱密度的增加,提高了电荷注入的势垒。热老化使陷阱密度下降,深陷阱加深,导致材料中空间电荷积聚,电场畸变明显,从而降低了材料的电气性能。

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关键词 ：交联聚乙烯, 电压稳定剂, 空间电荷, 直流电导率, 陷阱能级

Abstract：In order to further improve the electrical performance of cross-linked polyethylene (XLPE), 1% m-aminobenzoic acid, selected as voltage stabilizer, was added into XLPE blend by a solution method, and accelerated thermal aging experiment was carried out on the sample. The electrical properties of the materials before and after adding voltage stabilizer and thermal aging were analyzed by space charge, conductivity and surface potential decay measurements. The influence of the voltage stabilizer and thermal aging on the trap was analyzed by the distribution of the electric field and trap energy levels. The results show that m-aminobenzoic acid can effectively inhibit the space charge accumulation in XLPE, improve the distribution of electric field inside the sample, and reduce the DC conductivity of the sample. After thermal aging, the space charge accumulation and electric field distortion were obvious, the rate of the potential decay decrease, and DC conductivity increase. It can be seen that the addition of voltage stabilizer led to the increase of the density of deep and shallow traps inside the sample, and improved the charge injection barrier. Thermal aging reduces the density of traps and deepens the depth of traps, resulting in the accumulation of space charge and obvious electric field distortion, thus reducing the electrical properties of materials.

Key words： Cross-linked polyethylene (XLPE) voltage stabilizer space charge DC conductivity trap level

收稿日期: 2020-07-15

PACS:

TM85

基金资助:国家自然科学基金（51977187）、浙江省自然科学基金（LY18E070003）和浙江大学“百人计划”（自然科学A类）资助项目

通讯作者: 陈向荣男,1982年生,研究员,博士生导师,研究方向为先进电气材料+新一代测量传感技术、先进电力装备+新一代电网、高电压新技术等先进高压输电新技术。E-mail: chenxiangrongxh@zju.edu.cn

作者简介: 洪泽林男,1998年生,博士研究生,研究方向为高压电缆绝缘材料开发及电气测试技术。E-mail: hongzl@zju.edu.cn

引用本文:

洪泽林, 戴超, 张梦甜, 李秀娟, 陈向荣. 热老化对电压稳定剂改善交联聚乙烯绝缘性能的影响[J]. 电工技术学报, 2021, 36(zk1): 8-13. Hong Zelin, Dai Chao, Zhang Mengtian, Li Xiujuan, Chen Xiangrong. Effect of Thermal Aging on Voltage Stabilizer to Enhance Insulation Properties of Cross-Linked Polyethylene. Transactions of China Electrotechnical Society, 2021, 36(zk1): 8-13.

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