电缆中间接头局部放电电磁波传播特性分析及传感器优化设计

Electromagnetic Wave Propagation Characteristics Analysis in Partial Discharge of Cable Joint and Sensor Optimation Design of Sensor

高频电流法检测电缆中间接头局部放电故障,检测灵敏度较低,往往不能有效监测局部放电信号。电容耦合法灵敏度较高,具有监测中间接头局部放电的潜在应用可能性。采用有限元方法对电缆中间接头局部放电电磁波传播特性进行了仿真,得到不同监测点三个方向电场强度变化规律,分析局部放电电磁波衰减特性和频谱特性,并对电容传感器进行优化设计,为电容传感器在电缆中间接头局部放电监测应用提供理论参考。

In response to the low detection sensitivity of high-frequency current method for detecting partial discharge faults in cable intermediate joints,based on the high sensitivity of capacitive coupling method,finite element method is used to simulate the electromagnetic wave propagation characteristics of partial discharge in cable intermediate joints.The variation law of electric field intensity in three directions at different monitoring points is obtained.At the same time,the attenuation characteristics and spectral characteristics of partial discharge electromagnetic waves are analyzed,and the capacitance sensor is optimized for design,providing reference for the application of capacitance sensors in monitoring partial discharge in cable intermediate joints.