Method for recognizing power cable fault based on fractal and wavelet transform

Abstract

The invention discloses a system and method for recognizing a power cable fault based on fractal and wavelet transform. The system comprises a current detection circuit module, a signal modulation circuit module, a data collecting card and a master control computer which are connected in sequence, wherein the current detection circuit module comprises an A-phase hall current sensor, a B-phase hall current sensor and a C-phase hall current sensor, and the signal modulation circuit module comprises an A-phase I / V switching circuit module, a B-phase I / V switching circuit module, a C-phase I / V switching circuit module, an A-phase signal amplifying circuit module, a B-phase signal amplifying circuit module, a C-phase signal amplifying circuit module, an A-phase filter circuit module, a B-phase filter circuit module and a C-phase filter circuit module. The method comprises the following steps that signals are detected in real time and uploaded synchronously; the signals are collected and saved; the cable fault is recognized. The system and method for recognizing the power cable fault based on the fractal and the wavelet transform has the advantages of being novel and reasonable in design, high in detection precision, stability and reliability due to the fact that the hall current sensors are adopted to detect the cable current, capable of easily, rapidly, accurately and effectively recognizing the type of cable short fault by means of the combination of the fractal method and the wavelet transform method, strong in practicability, good in using effect and convenient to popularize and use.

Description

technical field [0001] The invention relates to the technical field of cable fault identification, in particular to a power cable fault identification method based on fractal and wavelet transform. Background technique [0002] The power cable transmission line is an important link in the power system and the central link between the power plant and the user. Since the power cables are buried deep underground for a long time and are susceptible to changes in the soil environment, they are prone to operational failures. In actual operation of the cables, various failures and abnormal operating conditions may occur. The most common and most dangerous failure is the occurrence of Various types of short-circuit, short-circuit faults include single-phase to ground short-circuit faults, two-phase short-circuits, two-phase-to-ground short-circuit faults, and three-phase short-circuit faults. At present, in the field of power cable fault detection and identification, relay protecti...

AI Technical Summary

Problems solved by technology

At present, there are many methods of fault detection using multi-wavelet decomposition. Although these methods have made some improvements to the wavelet analysis algorithm in noise, it is still difficult to distinguish disturbances that mainly change in time-domain characteristics, and they cannot be quickly and efficiently. Accurately classify and identify 10 common short-circuit faults

Images