The Changes in Electrical Properties of XL4421 Insulation under Repetitive Lightning Impulse Voltages

被引：0

作者：

Dao, N. L. ^{[1
]}

Lewin, P. L. ^{[1
]}

Hosier, I. L. ^{[1
]}

Swingler, S. G. ^{[1
]}

机构：

[1] Univ Southampton, Southampton SO17 1BJ, Hants, England

来源：

CONFERENCE RECORD OF THE 2010 IEEE INTERNATIONAL SYMPOSIUM ON ELECTRICAL INSULATION (ISEI) | 2010年

关键词：

Lightning impulse; ageing; breakdown; dielectric relaxation; space charge;

D O I：

暂无

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

XLPE is commonly used as the bulk dielectric for HV power cables. During a long service life, the insulation material will age and may ultimately degrade and fail. The service life of the cable will be affected by multifactor ageing processes. If the cable suffers a lot of lightning or switching impulse over-voltages during its working period, the ageing process may be accelerated. By analyzing the changes in electrical property of a material before and after experiencing impulse over-voltages, mechanisms for repetitive lightning and switching impulse ageing of XLPE can be distinguished. This research project involves sample preparation, impulse ageing of samples using laboratory equipment controlled by real time monitoring software, breakdown strength measurements and analysis using Weibull statistics, dielectric relaxation measurements in the frequency domain and space charge measurements using the pulsed-electroacoustic method. Obtained results are presented and their analysis highlights the mechanisms behind lightning impulse ageing.

引用

页数：4