高电压技术2018，Vol.44Issue(2)：518-526,9.DOI:10.13336/j.1003-6520.hve.20180131023
机械应力对硅橡胶高压电缆附件运行可靠性的影响
Influence of Mechanical Stress on the Operation Reliability of Silicone Rubber High Voltage Cable Accessories
摘要
Abstract
In recent years,failures of several cable accessories have happened in China due to improper manufacturing and processing or installating.These failures have led to explosion,fire and resulted in great power loss and a big risk to the safe operation of power system.In order to analyze the reasons of the breakdown,we analyzed several failure cases of engineering hotspot high voltage cable accessories with common features.Numerous investigations were carried out by using the techniques of electrical trees observation,mechanical testing,and electrical and mechanical simulation.Finally we analyzed the causes of the failures and the important influence of the mechanical stress on the long-term operation reliability of the high voltage cable accessories.The study results show that the excessively high mechanical stress of cable accessories will greatly increase the cyclic tensile force,under the extreme case,will probably lead to some internal damage to the dielectric material of the stress cone and trigger electrical trees under a lower electrical field.However,the low mechanical stress will make the interface pressure between the cable and accessory also small.thus there will be some micro-cracks or other defects generated in the interface,which may lead to surface discharge.The results of the analysis can provide a reference for the technical research and project implementation of the follow-up selection and optimization of the structure,testing and installation quality control of silicon rubber high voltage cable accessories.关键词
高压电缆附件/附件故障/机械应力/硅橡胶/电树枝/沿面放电Key words
high voltage cable accessories/accessories failure/mechanical stress/silicone rubber/electrical trees/surface discharge引用本文复制引用
刘昌,惠宝军,傅明利,刘通,侯帅,王晓游..机械应力对硅橡胶高压电缆附件运行可靠性的影响[J].高电压技术,2018,44(2):518-526,9.基金项目
中国南方电网有限责任公司科技项目(ZBKJXM20170089).Project supported by Science and Technology Project of China South Power Gird Co.,Ltd.,(ZBKJXM20170089). （ZBKJXM20170089）
