基于微波反射法的配电网电缆线路绝缘在线检测

On-line detection for cable line insulation of distribution network based on microwave reflection method

利用目前方法对配电网电缆线路绝缘在线检测时,没有对信号进行去噪处理,存在信号强度低、缺陷读数偏移量高、无缺陷读数偏移量超出设定范围的问题。为此,提出了基于微波反射法的配电网电缆线路绝缘在线检测方法,对信号进行滤波和去噪,使滤波后的信号序列与原始序列距离相近,完成去噪后基于微波反射法对配电网电缆线路绝缘进行在线检测,将微波射入电缆线路绝缘子中,依据它的传播过程,检测出电缆线路绝缘缺陷,实现微波反射法的配电网电缆线路绝缘在线检测。实验结果表明,通过对该方法进行去噪前后信号强度测试、缺陷读数偏移量测试及无缺陷读数偏移量测试,验证了该方法的有效性强、精准度高。

When the current method is used to detect the insulation of cable lines in distribution network,the signal is not denoised,which has the problems of low signal strength,high deviation of defect reading and deviation of defect free reading beyond the set range.In the process of detecting and de-noising the cable insulation line based on the microwave transmission sequence,the method of detecting and de-noising the cable insulation line is proposed based on the reflection distance of the cable insulation line,to realize the on-line detection of cable insulation in distribution network by microwave reflection method.The experimental results show that the method is effective and accurate by testing the signal strength,defect reading offset and defect free reading offset before and after denoising.