摘要
电力电缆接头在电网中数量众多并且是电缆故障主要发生点，文中建立了电力电缆接头的暂态热路模型，并推算出电缆接头内部高压导体的绝缘外侧的一点温升非线性表达式，通过对该点的温度监测并对其暂态温升表达式进行最小二乘拟合，便可得到表征电缆接头绝缘等工况的特征参数，用以电缆接头工况判别和故障判断。进一步又提出一种根据监测点反演高压导体温度的方法。
Power cable connector in the power grid is the point where a large number of major cable fault occurred . This paper established a power cable connector road transient thermal model and deduced the nonlinear expression of the temperature rise between the external and the insulating layer, then calculated characteristic parameters of cable connector by monitoring the temperature of the monitoring point and Least-squares fit of the expression , so we could judge the physical condition of cable connector. At the same time, the paper presents a inversion method to calculate the temperature of the high voltage conductor.
出处
《电源技术应用》
2015年第9期29-34,共6页
Power Supply Technologles and Applications
关键词
电缆接头
暂态热路模型
最小二乘拟合
温度反演
power cable connector
transient thermal circuit model
least squares temperature inversion
