The Reaserch Of Power Cable Fault Location System

With a steady development of China's science and technology, especially power technology is advancing by leaps, In order to adapt the needs of high power electrical energy transmission and distribution, power cable line came into being. Power cable line, with its high reliability, security, small transmission channel, strong anti-jamming and other advantages gradually replacing overhead lines. However, as with overhead lines, faults will be also occur in the cable running due to various external and internal causes. So, how to accurately and quickly determine the location of power cable fault, fault types, accident causes is an important aspect in power cable running.This paper details the basic principle and application of power cable fault detecting technology. Starting from the cause and classification of power cable fault, describe the cable line voltage, current traveling wave theory and a technique of fault location based on the basis of this theory, In order to optimize the design of fault detection system, I will introduce a wavelet analysis theory, which plays a role in the signal denoising and singularity detection in fault detection,In addition, this paper also analysis the "Sound magnetic joint fixed-point technology". And on this basis, a set of hardware modules of cable fault pointing instrument has been designed, which provides a fast, accurate and intuitive way to find the point of fault to the technicians. At last, by fault actual case studies, I introduces the applications of "Low-voltage pulse reflection" method,"Pulse current method" as well as "Secondary pulse method " in actual fault detection, which provide a practical reference for reasonable selecting detection methods and instruments.