【摘要】 为实现电力电缆故障的自动定位和故障性质的自动判断,介绍了一种基于低压脉冲反射法的电力电缆故障自动定位方法,该方法将故障反射波整形为矩形脉冲,通过设置门槛电压来克服电缆中间接头的反射影响,利用相关函数,对信号进行相关处理,消除其他各种干扰的影响。能自动计算电缆故障距离,自动判断电缆的低阻短路故障和开路故障。此方法在基于虚拟仪器的电缆故障测距仪上进行了软件实现,针对电力电缆进行了实测试验,实测结果验证了该方法的有效性和正确性。更多还原

【Abstract】 In order to realize automatic location of power cable fault and judgment of fault characteristics,a method of power cable fault automatic location based on the principle of low voltage pulse reflection is introduced in the paper.It shapes the fault reflecting wave into rectangle pulse,through setting threshold voltage to overcome the effect of the reflection of cable joint,also it eliminates some other noise interferences by correlative processing in the signal utilizing correlation function.The method can calculate the distance of fault and judge the low resistant short-circuit and open-circuit fault automatically.The software is realized on the instrument of cable fault location based on the virtual instrument and a practice test is made on a section of cable.The experimental results demonstrate that the method is valid and correct.更多还原