Cable fault detection testing system and working method thereof

A test system, a technology for cable faults, applied in the fault location, detecting faults by conductor type, etc., can solve the problems of difficulty in obtaining the fault location, distortion of reflected signals, high acquisition rate, easy balance calibration, and small information value. , Improve the effect of collecting bits

Active Publication Date: 2016-03-23
JINCHENG POWER SUPPLY COMPANY OF STATE GRID SHANXI ELECTRIC POWER
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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.

Method used

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  • Cable fault detection testing system and working method thereof

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Embodiment 1

[0024] Such as figure 1 shown. Carry out fault detection for 10kV XLPE cables with a length of 600m, and build a cable fault detection test system, specifically including: a microprocessor using an ARM chip, responsible for the control of the entire monitoring test system, and controlling the sent control data and received The data is calculated and analyzed; the DDS signal generator 1 controlled by the microprocessor generates a rectangular wave signal 1 with adjustable frequency and amplitude; the DDS signal generator 2 controlled by the microprocessor generates adjustable frequency and amplitude The rectangular wave signal 2, the frequency and amplitude of the rectangular wave signal 2 are consistent with the rectangular wave signal 1; the adjustable inductor 1, whose inductance is controlled by the microprocessor, is connected in series between the DDS signal generator 1 and the cable under test, Send the received rectangular wave signal 1 into the cable under test, filte...

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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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
CPCG01R31/083
Inventor 高虎元靳晋王艳丰金治华牛玉琨焦广旭杨林李永强
Owner JINCHENG POWER SUPPLY COMPANY OF STATE GRID SHANXI ELECTRIC POWER
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