热老化交联聚乙烯绝缘状态评估和介电参数计算的新型电荷表征和分析方法*

doi:10.11985/2021.02.004

电气工程学报 ›› 2021, Vol. 16 ›› Issue (2): 25-32.doi: 10.11985/2021.02.004

• 特邀专栏：高压电工装备绝缘 • 上一篇下一篇

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热老化交联聚乙烯绝缘状态评估和介电参数计算的新型电荷表征和分析方法^*

黄炳融¹(), 王威望¹(), 李盛涛¹(), 李欣原¹, 蒋起航¹, 聂永杰², 邓云坤²

1.西安交通大学电力设备电气绝缘国家重点实验室西安 710049
2.云南电网有限责任公司电力科学研究院昆明 650217

收稿日期:2021-02-22 修回日期:2021-04-24 出版日期:2021-06-25 发布日期:2021-08-05
作者简介:黄炳融,男,1999年生,硕士研究生。主要研究方向为XLPE电缆空间电荷。E-mail： beyondh@stu.xjtu.edu.cn
王威望,男,1987年生,博士,副教授。主要研究方向为电力设备绝缘、电工材料特性及机理、功能化纳米复合电介质。E-mail： weiwwang@xjtu.edu.cn
李盛涛,男,1963年生,博士,教授。主要研究方向为电介质理论与应用,特殊环境下电介质材料及器件,功能电介质。E-mail： sli@mail.xjtu.edu.cn
基金资助:
* 国家自然科学基金(51707143);云南电科院一般(YNKJXM20190701)

Study on Dynamic Charge Characteristics of Thermal Aging XLPE Based on Direct Current Integral Charge Technique

HUANG Bingrong¹(), WANG Weiwang¹(), LI Shengtao¹(), LI Xinyuan¹, JIANG Qihang¹, NIE Yongjie², DENG Yunkun²

1. State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, Xi’an 710049
2. Electric Power Research Institute of Yunnan Power Grid Co., Ltd., Kunming 650217

Received:2021-02-22 Revised:2021-04-24 Online:2021-06-25 Published:2021-08-05

摘要/Abstract

摘要：

基于电流积分电荷量(DCIC-Q(t))技术研究了不同热老化时间下交联聚乙烯(XLPE)的动态电荷特性。对XLPE薄片试样施加电场,观察其电荷量随电场强度的变化规律,提出电荷量之比k作为判定空间电荷积累的依据;通过瞬时充电电荷Q₀与电压的线性关系拟合得到XLPE电容,进一步计算获得介电常数;提出松弛时间τ与介电常数、电导率之间的关系,获得不同电场下电导率变化曲线。随着热老化时间的增加,XLPE绝缘动态电荷比值、介电常数以及电导率先略有增加,然后迅速上升。这说明短时间的热老化对XLPE的电性能影响不明显,但热老化时间的增加会导致电缆绝缘电气性能发生明显劣化。XLPE片状试样的研究为整体电缆老化评估提供试验依据。

关键词: DCIC-Q(t), XLPE, 热老化, 动态电荷

Abstract:

The dynamic charge characteristics of XLPE under different thermal aging times are studied using DCIC-Q(t) technique. The curves of dynamic charge under different applied voltage is obtained, and the concept of charge ratiok is put forward to judge the injection and accumulation of space charge. XLPE capacitance is obtained by fitting the linear relation between instantaneous chargeQ₀ and voltage, and the variation rule between dielectric constant and thermal aging is further calculated and analyzed. The relationship between relaxation time and dielectric constant and conductivity is determined, and the variation curve of the conductance under different electric fields is obtained. The change of dynamic charge ratio, dielectric constant and conductivity of XLPE samples are analyzed, and it is found that with the thermal aging process, the three unchange at first and then increase quickly, indicating that the thermal aging of a short time has a little effect on the electrical performance of XLPE insulation, but the increase of aging time would degrade it. The XLPE lamellar experiment provides a theoretical basis for the whole cable aging evaluation model.

Key words: DCIC-Q(t), XLPE, thermal aging, dynamic charge

中图分类号:

TM215

黄炳融, 王威望, 李盛涛, 李欣原, 蒋起航, 聂永杰, 邓云坤. 热老化交联聚乙烯绝缘状态评估和介电参数计算的新型电荷表征和分析方法^*[J]. 电气工程学报, 2021, 16(2): 25-32.

HUANG Bingrong, WANG Weiwang, LI Shengtao, LI Xinyuan, JIANG Qihang, NIE Yongjie, DENG Yunkun. Study on Dynamic Charge Characteristics of Thermal Aging XLPE Based on Direct Current Integral Charge Technique[J]. Journal of Electrical Engineering, 2021, 16(2): 25-32.

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参考文献 18

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试样名称	老化温度/℃	热老化时间/h
F	—	0
L1	100	240
L2	100	840
L3	100	1 440
L4	100	2 160

热老化交联聚乙烯绝缘状态评估和介电参数计算的新型电荷表征和分析方法^*

Study on Dynamic Charge Characteristics of Thermal Aging XLPE Based on Direct Current Integral Charge Technique

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