Application of Extended Derivative Method in Analyzing Dielectric Responses of Dielectrics

WU Kangning; HUANG Yuwei; WANG Ziyue; ZHU Yuanwei; LI Jianying

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Application of Extended Derivative Method in Analyzing Dielectric Responses of Dielectrics

更新时间：2025-12-08

- Application of Extended Derivative Method in Analyzing Dielectric Responses of Dielectrics
- Vol. 46, Issue 2, Pages: 640-647(2020)
- 作者机构：
  
  1. 西安交通大学电力设备电气绝缘国家重点实验室
  2. 中国电力工程顾问集团西北电力设计院有限公司
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published Online：29 February 2020，
  
  Published：2020
- 稿件说明：
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WU Kangning, HUANG Yuwei, WANG Ziyue, et al. Application of Extended Derivative Method in Analyzing Dielectric Responses of Dielectrics[J]. 2020, 46(2): 640-647.
DOI：

WU Kangning, HUANG Yuwei, WANG Ziyue, et al. Application of Extended Derivative Method in Analyzing Dielectric Responses of Dielectrics[J]. 2020, 46(2): 640-647. DOI：

摘要

电介质的性能劣化往往率先体现为其高温低频介电特性的变化

因此完善对电介质高温低频介电响应特性的认识

对进一步理解其劣化机制、优化状态评估技术具有重要意义。然而具有长松弛时间的介电松弛过程往往和直流电导耦合在一起

高温低频段的介电松弛过程被直流电导分量掩盖

无法对其进一步研究。甚至在一些介电谱图中

直流电导过程由于能够表现出与松弛过程相似的频率和温度依赖特性而被误作介电松弛处理

更加增加了认识电介质中低频松弛响应的难度。因此提出一种衍生对导数法

仅将松弛过程以松弛峰的形式呈现出来而不包含直流电导分量。选取电力设备中常见的3种典型工程电介质:环氧树脂、油纸绝缘和氧化锌压敏陶瓷为例

应用衍生对导数法

分别从直流电导掩盖中有效地分离出新的低频介电松弛过程;基于其响应特性讨论了在不同电介质中高温低频介电松弛可能的物理机制;为进一步理解工程电介质劣化微观机制及完善其状态评估技术提供基础。

Abstract

Varied high-temperature and low-frequency dielectric characteristics are commonly detected in deteriorated engineering dielectrics

including increased dielectric permittivity

loss factor

etc. Consequently

a clear insight into those dielectric responses is of great significance to further degradation investigation and condition assessment. However

the relaxations are usually coupled with DC conductance so that they are easily covered by conductance component in low-frequency range

thus further studies on them are hardly to be carried out. What is worse

DC conductance is sometimes mistaken for a relaxation process in some dielectric spectra due to similar temperature and frequency dependence. Therefore

we proposed an extended derivative spectroscopy which only remains relaxations but excludes DC conductance. Taking three typical engineering dielectrics

such as poxy

oil-impregnated paper

and ZnO ceramics

as examples

we successfully characterized new low-frequency relaxations from the covered DC conductance via the improved spectra. Moreover

we discussed the physical mechanism of the relaxations in the three different dielectrics respectively. The results provide a potential approach for further manipulating and assessing properties of engineering dielectrics.

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