电缆故障测距系统的设计

The Design of Cable Fault Location System Based on LPC2142 Processor

分析了电缆故障测距中普遍存在的反射波波头难以准确识别的问题,引入了数学形态学和小波分析理论,对行波测距方法进行了改进,将数学形态学和小波分析结合起来滤除行波信号中的噪声,从而找出行波到达的准确时刻。在此基础上设计出电力电缆故障测距系统,并对1条300 m长的交联聚乙烯电缆进行了故障测距实验,实验结果表明该系统可以有效地测出故障距离,测量误差小,具有一定的实用性。

This paper analyzed the prevailing problem in cable fault location,which is the head wave of the reflection is hard to identify accurately.By using the mathematical morphology and wavelet analysis theory,the traveling wave method is improved.After filtering the noise signal in wave by combining the mathematical morphology and wavelet analysis,the exact arrival time of wave can be found.A power cable fault location system on this basis is designed and a fault location test is taken on 300 meter long cross-linked polyethylene cable.The result shows that the system can effectively measure the fault distance,the measurement error is small and have a certain practicality.