摘要
电缆系统运行温度对新型超高压预制式电缆附件主绝缘材料高温硫化(HTV)硅橡胶的性能具有重要的影响。为此,针对温度对HTV硅橡胶材料电树枝老化特性的影响展开了试验研究,测定了温度对HTV硅橡胶材料电树枝老化特性的影响规律,并对试验结果进行了理论分析。研究结果表明,在试验温度范围内,温升导致HTV硅橡胶击穿场强呈现略微下降的趋势,而起树电压则随温度的升高明显下降。试验中还发现HTV硅橡胶电树枝形态与温度密切相关,室温条件下以树枝状和松枝状电树枝为主,而高温下则以丛状电树枝为主。对上述试验结果的分析讨论后认为,温升引起HTV硅橡胶起树电压的大幅降低是导致新型预制式硅橡胶超高压电缆附件绝缘故障频繁的重要原因,因此,在电缆附件的绝缘结构设计时,对于温度变化而引起材料电气性能参数变化的相关问题应给予更多的关注。
The operating temperature of power cable system has an important influence on the electrical performance of high temperature vulcanized（HTV） silicon rubber in the new types of extra high voltage（EHV） prefabricated cable accessories.In this paper,tests were conducted to reveal the relationship between the temperature and the electrical tree aging characteristics.The results show that,at the temperature of test range,the increasing temperature results in a slight decrease in the breakdown field strength,as well as an obvious reduction in the electrical tree initiation voltage.It is also found that the electrical tree patterns in HTV silicone rubber are closely related to the temperature.At room temperature,the electrical trees are mainly composed of branch-like trees and a few pine-like trees,while only bush-like trees are observed at high temperatures.Based on the above analysis and discussion,it is believed that the significant reduction in electrical tree initiation voltage caused by the rise of temperature is an important reason that leads to frequent insulation failures in new type EHV prefabricated cable accessories.It is suggested that,the temperature influence on the variations of material electrical performance parameters should be given sufficient attention in insulation designing.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2012年第10期2640-2646,共7页
High Voltage Engineering
基金
国家自然科学基金(50877040)
电力设备电气绝缘国家重点实验室开放课题
国家电网公司科技项目~~
关键词
硅橡胶
温度
电树枝老化
起树电压
电树枝形态
绝缘破坏
silicone rubber
temperature
electrical tree aging
initiation voltage
electrical tree shape
insulation failure
