用于电缆接头局放检测的插入式传感器频响特性研究

Study on Frequency Response Characteristics of Plug-in Sensor for Cable Joint Partial Discharge Detection

电缆接头是电力输电线路的薄弱环节,检测接头局部放电利于电缆的绝缘状态安全评估。但是,为保证抗干扰能力,现有的局放检测传感器多数会对电缆原有屏蔽结构造成破坏,从而影响电缆的绝缘性能。文中针对中压电缆接头,使用了一种不破坏电缆屏蔽结构的插入式传感器检测局部放电,并以仿真和试验证明该传感器的检测原理正确,再通过计算和试验得到了传感器的频率响应特性曲线,结果表明,该传感器的检测频带利于检测局放信号,能有效抑制低频干扰,响应高频信号,值得进一步研究和推广。

Cable joint is the weakness of transmission line,its partial discharge(PD)detection is beneficial to the analysis for insulation condition of cables.In order to anting the interference,the existing PD sensor will damage the shielding layer and affect insulating property.This paper presents a plug-in sensor to PD detection for the medium voltage XLPE cable joint in the case of not damaging the shielding layer.The principle of the sensor has been proved by simulations and experiments.And the frequency response characteristic has been solved by analytic method and the test.The result indicates that the PD detecting frequency band is effective to minimize the low frequency disturbance and respond the high frequency signal.The Plug-in sensor is worthy of research and extension.