直流电压下交联聚乙烯电缆绝缘中电树枝的生长特性研究

刘英; 曹晓珑

doi:10.7652/xjtuxb201404008

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直流电压下交联聚乙烯电缆绝缘中电树枝的生长特性研究

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- 直流电压下交联聚乙烯电缆绝缘中电树枝的生长特性研究
- Growth Characteristics of Electrical Trees in XLPE Cable Insulation under DC Voltage
- 西安交通大学学报 2014年48卷第4期页码：41-46+126
- 作者机构：
  
  西安交通大学电力设备电气绝缘国家重点实验室,西安,710049
- 作者简介：
- 基金信息：
  
  : 2013-08-13。作者简介: 刘英(1976—),女,博士,讲师;曹晓珑(通信作者),男,教授,博士生导师。基金项目: 国家自然科学基金资助项目(51307131)
- DOI：10.7652/xjtuxb201404008
  中图分类号： TM247;TM215.1
- 网络首发：2014-04-10，
  
  纸质出版：2014
- 稿件说明：
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刘英, 曹晓珑. 直流电压下交联聚乙烯电缆绝缘中电树枝的生长特性研究[J]. 西安交通大学学报, 2014,48(4):41-46+126.

Growth Characteristics of Electrical Trees in XLPE Cable Insulation under DC Voltage[J]. 2014, 48(4): 41-46+126.
刘英, 曹晓珑. 直流电压下交联聚乙烯电缆绝缘中电树枝的生长特性研究[J]. 西安交通大学学报, 2014,48(4):41-46+126. DOI： 10.7652/xjtuxb201404008.

Growth Characteristics of Electrical Trees in XLPE Cable Insulation under DC Voltage[J]. 2014, 48(4): 41-46+126. DOI： 10.7652/xjtuxb201404008.

摘要

为了研究交联聚乙烯电缆绝缘材料中直流电树枝的生长速率、形态特征及通道特性

利用树枝化试验及显微观察系统

在针尖半径为5 μm、针-板电极间距为2 mm、周期性施加的间断直流电压下

对试样进行了分组试验。试验结果显示:电树枝由细单枝逐渐发展为稀疏丛状结构

树枝通道为非导电型; 电树枝生长缓慢

生长速率不超过1.0 μm/min; 树枝长度主要取决于加压周期数及直流电压幅值

电压持续时间在高压下影响增大; 针极意外接地情况下

电树枝将瞬间引发或快速生长。理论分析表明

电树枝生长规律可以由文中所建立的非导电树枝模型及等效电路进行合理解释

而空间电荷效应是产生直流接地树现象的根本原因。

Abstract

The growth

shape and channel characteristics of electrical trees in XLPE cable insulation under DC voltages are investigated by combination of treeing test with microscopic observation system. In the experiment

the tip radius of the needle electrode is taken as 5 μm

the pin-plane distance as 2 mm

and the intermittent DC voltages are applied on grouped samples periodically. The experiments show that the electrical trees develop gradually from a single slender branch to a sparse bush-like structure

and the tree channels are non-conductive. The trees grow very slowly

with a growth rate no more than 1.0 μm/min. The tree length increases with the increasing number of cycles and amplitude of DC voltage

and it is also proportional to the voltage duration in each cycle at 60 kV. Under the condition of an unexpected grounding of the needle electrode

a new tree initiates instantly from the needle tip

while an existing tree grow very rapidly. The tree growth pattern can be theoretically explained by the equivalent circuit according to a non-conductive tree model

and the space charge effect is the essential reason for grounded DC tree.

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references

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