摘要
为研究高频谐波电压下电缆头的失效原因,本文对电缆头(非线性应力控制型)在高频谐波电压下的热点温度升高现象及原因进行了研究。搭建了高频、高压和大电流发生装置以模拟电缆头的实际工况,研究了有、无负荷电流下的红外图像特征和电压对热点温度的影响。建立了电缆头的有限元模型,通过电热耦合分析软件对电缆头进行电场和温度场耦合仿真分析,结合电缆头红外热图像分析了谐波电压对电缆头温升的影响。分析结果表明,随着电压值的增加,非线性应力管的局部位置电场增强,并存在一个电场阈值,当大于该阈值时,阻性发热迅速增加,导致表面形成温度升高。
In order to understand the effect of high frequency harmonic voltage on premature failure of a terminal（a nonlinear stress control type）,this paper investigates the temperature rise of hot spot and causess at high frequency harmonic voltage.With high frequency,high voltage and large current generating equipments being set up to simulate actual operating conditions,the characteristics of infrared thermal images and effects of voltage amplitude on hot spot temperature rise are also studied with and without current.Moreover,by using the electric-heat coupling analysis method,the electric field and temperature distribution are obtained.With using the infrared images of the cable terminal,effects of increasing voltage on hot spot temperature rise are analyzed.The research result shows that with the increasing of voltage amplitude the temperature rise of the nonlinear stress control cable terminal boosts up,and a threshold of electric field occures.Once the electric field of the stress control tube is larger than the threshold,the resistive heating greatly rises,which leads the surface temperature to rise.
出处
《电测与仪表》
北大核心
2013年第7期29-34,共6页
Electrical Measurement & Instrumentation
基金
重庆电力公司科技基金资助项目(12H0932)
关键词
电缆头
红外成像
电热耦合
非线性电场
阻性发热
cable terminal
infrared imaging
electric-heat coupling
nonlinear electric field
resistive heating
