Cable fault detection testing system and working method thereof

Abstract

The present invention discloses a cable fault detection testing system and a working method thereof. The system comprises a microprocessor, DDS signal generators 1 and 2 which generate two paths of rectangular wave signals with consistent frequency and amplitude, adjustable inductors 1 and 2 which are connected between the DDS 1 and 2 and a detected cable in series, adjustable standard capacitors which are connected between current transformers 1 and 2 and a same ground end in series, a peak detectors 1 and 2 which are respectively connected to the current transformers 1 and 2 in series, a multiplier which calculates the correlation of the output signals of the detectors 1 and 2, and an analog to digital converter which carries out analog to digital conversion on a multiplier output voltage signal and then sends the signal into the microprocessor. Compared with the prior art, based on the two paths of symmetrical rectangular wave signals, the effective detection of a cable fault can be realized, a test signal waveform quality requirement is low, the signal sampling rate is low, the system structure is simple, the realization is easy, and the cost is low.

Description

technical field [0001] The invention relates to a cable fault detection test system, in particular to a cable fault detection test system based on two-way symmetrical rectangular wave test signals and a working method thereof. Background technique [0002] The traditional cable fault detection method is based on the analysis of the frequency or intensity of the reflected signal, and the fault location is identified by analyzing the time difference between the reflected signal and the reflected signal. However, because the reflected signal is easily distorted by the environment, it is difficult to obtain an accurate fault location, especially in the case of heavy interference and many defect points on site. At present, the analysis technology using frequency domain oscillatory wave has high frequency, difficult calibration and high acquisition rate, which makes the overall cost high. Contents of the invention [0003] The purpose of the present invention is to address the ...

AI Technical Summary

Problems solved by technology

However, because the reflected signal is easily distorted by the environment, it is difficult to obtain an accurate fault location, especially in the case of heavy interference and many defect points on site

At present, the analysis technology using frequency domain oscillatory wave is high in frequency, difficult to calibrate, and high in acquisition rate, which makes the overall cost high.

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