Electrical Aging Characteristic of Oil Immersed Pressboard Under Partial Discharge Activity

CUI Yanjie; CAO Pei; ZHU Lingyu; DENG Junbo; PENG Ping; JI Shengchang

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Electrical Aging Characteristic of Oil Immersed Pressboard Under Partial Discharge Activity

更新时间：2025-12-08

- Electrical Aging Characteristic of Oil Immersed Pressboard Under Partial Discharge Activity
- Vol. 45, Issue 9, Pages: 2945-2953(2019)
- 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. 国网湖南省电力公司电力科学研究院
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published Online：30 September 2019，
  
  Published：2019
- 稿件说明：
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CUI Yanjie, CAO Pei, ZHU Lingyu, et al. Electrical Aging Characteristic of Oil Immersed Pressboard Under Partial Discharge Activity[J]. 2019, 45(9): 2945-2953.
DOI：

CUI Yanjie, CAO Pei, ZHU Lingyu, et al. Electrical Aging Characteristic of Oil Immersed Pressboard Under Partial Discharge Activity[J]. 2019, 45(9): 2945-2953. DOI：

摘要

油纸绝缘材料被广泛地应用于电力设备中

而当电力设备存在缺陷引发局部放电时

其绝缘性能会不断劣化。本文研究了长期局部放电作用下绝缘纸板的电老化特性

建立了针板结构的油浸绝缘纸板局部放电模型。在长期恒定电压下

研究了纸板从开始局部放电到击穿的整个电老化过程中各项局部放电特征量的变化情况

并利用显微镜观察了电老化过程中针电极尖端附近区域的动态表现

得出了纸板产气的变化规律。在电老化完成后

采用扫描电镜观察了纸板的表面形态。结果表明:绝缘纸板的电老化过程可以分为3个阶段

即起始期、发展期与爆发期;其中发展期内部

局部放电会时有停滞;进入发展期后

平均放电量与脉冲重复率下降至极小值时

可以判定绝缘材料电老化将要进入末期

临近击穿。研究结果得到了局放特征量随着电老化发展的变化规律

提出了3个阶段划分的依据

为今后进一步研究油纸绝缘在局部放电作用下的电老化特性奠定了基础。

Abstract

Oil impregnated pressboard is widely used as an electrical insulation medium in electrical equipment. Partial discharge（PD） caused by defects in an insulation medium can deteriorate insulation condition. Therefore

to study the electrical aging characteristic of oil impregnated pressboard under long-term PD

we developed a partial discharge model using needle-to-plane gap with oil-paper insulation system. Moreover

we investigated the variations in features of PD under long-term constant voltage during the entire electrical aging process. The surface damaging conditions near the tip of needle electrode were observed by microscope

with which the gas generating situation was also studied. After the electrical life of the pressband finished

its surface morphology was observed by scanning electron microscopy. The results show that the electrical aging process can be divided into three stages: initial stage

developing stage

and erupting stage. During the developing stage

PD will occasionally stop developing for a while. After both average PD magnitudes and pulse repetition rate have dropped to a minimum value in developing stage

the electrical aging of insulation material is close to breakdown. The variation of features of PD with the development of electrical aging is obtained in the end. The division criterion of three stages can lay the foundation for further studies on electrical aging properties of oil impregnated pressboard.

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