基于高频局放检测的电缆绝缘诊断系统设计研究

Design and Research of Cable Insulation Diagnostic System Based on High Frequency Partial Discharge Detection

针对目前高压电缆现场常用的高频局部放电检测,设计开发了一种高频电流局放检测诊断系统。介绍了仪器的软硬件设计、信号分离及故障定位技术,提出采用脉冲阈值滤波与脉冲聚类相结合的方式对噪声进行滤除和分离。所开发的设备在实验室进行了传输阻抗、检测频率、灵敏度、线性度、抗干扰性等性能验证,并进行了现场带电检测。结果证明所开发的设备满足相关规程检测精度要求,可以用于高压电缆的带电检测及故障诊断测试。

Aiming at the high-frequency partial discharge detection commonly used in the field of high-voltage cables,a high-frequency current partial discharge detection and diagnosis system is designed and developed.The software and hardware design,signal separation and fault location technology of the instrument are introduced,and the combination of pulse threshold filtering and pulse clustering is proposed to filter and separate noise.The developed equipment was tested in the laboratory for transmission impedance,detection frequency,sensitivity,linearity,anti-interference and other performance verification,and conducted live live detection.The results prove that the developed equipment meets the requirements of the relevant regulations for detection accuracy and can be used for live detection and fault diagnosis tests of high-voltage cables.