高压大电流下电缆附件电热老化实验装置的研制  

Development of Electrical-thermal Aging Experimental Setup for Cable Accessories Under High Voltage and Large Current

作　　者：游世宇 吴雨波 万利[2] 周凯[2] 李旭涛[2] 

机构地区：[1]四川省电力公司阿坝公司,阿坝623200 [2]四川大学电气信息学院,成都610065

出　　处：《高压电器》2013年第7期29-34,共6页High Voltage Apparatus

基　　金：国家电网公司科技项目(12H0596)~~

摘　　要：电缆附件在运行过程中承受电热的协同作用使其绝缘逐步老化失效,传统的电热老化实验平台无法完全等效电缆附件实际使用过程中的电热协同作用。笔者研制了一种模拟高压大电流条件的电缆附件电热老化装置,装置主体部分由电缆附件及电缆连接组成电流回路,CT(电流互感器)通过电磁感应在回路中耦合产生约250 A的大电流,利用负荷电流的热效应来模拟电缆附件绝缘所承受的热应力作用;同时通过试验变压器施加工频高压到金属回路中,进行电缆附件的电老化。装置搭建完成后,在额定通流条件下进行了工频耐压试验。此外,通过磁场有限元仿真分析了感应电流的产生原理,研究了CT各参数对感应电流大小的影响。该装置为高压大电流下电缆附件的电热老化研究提供了一种新的参考实验方法。Cable accessories are often subjected to the electrical and thermal stresses simultaneously in the operation of power system.Traditional electrical-thermal aging experimental devices cannot well simulate the electrical-thermal cooperative effects.An aging experimental setup under high voltage and high current was designed to simulate the electrical-thermal aging condition of the cable accessory in power system.The current loop of the experimental setup is composed of cable accessories and connection cables.Power frequency high voltage generated by a test transformer is applied to specimens and high current about 250 A generated by CT flows through the loop.Compared with other thermal aging systems,heat of the aging system is originated from heat effect of electric current.A power frequency voltage withstand test was successfully performed for the experimental setup under rated current.Moreover,the magnetic field around CT was analyzed by Finite Element Method（FEM）.Based on the results,theoretical values for the current generated in the loop can be calculated to investigate the relationships between induced current and parameters of CT.The experimental setup provides a new reference method for cable accessories electrical and thermal stress aging.

关 键 词：电缆附件 电热老化 电流回路 电流互感器 

分 类 号：TM832[电气工程—高电压与绝缘技术] TM855