基于串联谐振的电缆局部放电双传感器检测技术

Cable Partial Discharge Double Sensor Detection Technology Based on Series Resonance

常规的电缆局部放电检测技术大多采用非本征光纤法进行检测,该方法具有较强的局限性,检测周期较长,而且检测结果的准确度较低,无法获取精度较高的电缆局部放电信息数据,阻碍了电力行业的高速发展。针对这一问题,引入串联谐振与双传感器原理,提出了一种全新的检测技术。通过提取与预处理电缆局部放电信号脉冲,获取脉冲信号的动态变化。基于串联谐振设计变频式双传感器,提高电缆局部放电检测的效率。在此基础上,计算电缆局部放电源点,利用变频式双传感器快速检测并定位电缆局部放电信号缺陷。由实验结果可知,新检测技术的检测准确度均在96%以上,放电信号的检测效果更好。

Conventional cable partial discharge detection technology mostly uses extrinsic optical fiber method,which has strong limitations,long detection period and low accuracy of detection results,and can not obtain highprecision cable partial discharge information data,which hinders the rapid development of power industry.Aiming at this problem,a new detection technology is proposed by introducing the principle of series resonance and double sensors.By extracting and preprocessing the pulse of cable partial discharge signal,the dynamic change of pulse signal is obtained.Based on series resonance,frequency conversion dual sensors are designed to improve the efficiency of cable partial discharge detection.On this basis,the partial discharge point of the cable is calculated,and the partial discharge signal defect of the cable is quickly detected and located by using frequency conversion double sensors.The experimental results show that the detection accuracy of the new detection technology is above 96%,and the detection effect of discharge signal is better.