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Automatic positioning method and system for cable local discharge single end of OWTS (Oscillating Wave Test System) detection device

A cable partial discharge and automatic positioning technology, which is applied in the direction of testing dielectric strength and fault location, can solve the problems of inaccurate positioning analysis results, false feature points, and affecting the accuracy of time delay measurement, so as to facilitate the judgment of fault location and location The analysis results are accurate and the effect of reducing the existence of scattered points

Active Publication Date: 2012-05-02
GUANGZHOU POWER SUPPLY BUREAU GUANGDONG POWER GRID CO LTD +1
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Problems solved by technology

In the prior art, using the above method of obtaining the time difference, the traveling wave method applied to power cable fault location mainly includes the single-ended traveling wave method and the double-ended traveling wave method. For the single-ended traveling wave method, the above method is difficult to achieve Synchronization between the acquired original signal and the reflected signal; and when using the double-ended traveling wave method, it leads to prohibitive cost
[0006] Comprehensive analysis, although the above method is relatively simple, false feature points often appear due to the influence of interference, which affects the measurement accuracy of time delay, easily leads to errors in positioning, and makes the positioning analysis results inaccurate

Method used

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  • Automatic positioning method and system for cable local discharge single end of OWTS (Oscillating Wave Test System) detection device
  • Automatic positioning method and system for cable local discharge single end of OWTS (Oscillating Wave Test System) detection device
  • Automatic positioning method and system for cable local discharge single end of OWTS (Oscillating Wave Test System) detection device

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Embodiment Construction

[0029] See figure 1 As shown, figure 1 It is a schematic diagram of the structure of the signal transmission model of the cable. The transmission path of the original pulse is from D to A, and the transmission path of the reflected pulse is from D to B (reflected at B) and then to A. The signal collection devices are all at the A end. Cable length L=r 1 +r 2 , The transmission distance of the original pulse is r 1 , The transmission distance of the reflected pulse is (r 1 +2r 2 ).

[0030] See figure 2 As shown, when the OWTS detection device performs partial discharge detection on the cable, it needs to enter the basic information of the cable. Before applying the voltage, the cable needs to be calibrated and tested. After applying different voltage levels, a series of continuous waveforms will be generated. The data acquisition card Save data in memory. Because the parameters used in traveling wave positioning are the cable length L, the transmission wave speed V of the wavefo...

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Abstract

The invention discloses an automatic positioning method for a cable local discharge single end of an OWTS (Oscillating Wave Test System) detection device. The automatic positioning method comprises the following steps of: extracting a positioning parameter containing positioning information from test data saved in an OWTS local discharge detection device; enabling the positioning parameter to generate a graph of sampling points; respectively setting waveform sections corresponding to wave crests in the graph as original pulses; then searching the waveforms matched with the original pulses from the graph; calculating the time difference between the wave crests matched with the waveforms and the wave crests of the original pulse; and calculating the position of a fault according to the time difference. The invention also provides an automatic positioning system for the cable local discharge single end of the OWTS detection device. By using the technology disclosed by the invention, the fault pointing result of the cable is more intensive and scatter points are reduced, so that more accurate positioning analysis result is obtained, automatic analyzing and positioning can be carried out and costs of labor consumption and positioning are reduced.

Description

Technical field [0001] The invention relates to power cable partial discharge detection technology, in particular to a cable partial discharge single-ended automatic positioning method and system of an OWTS detection device. Background technique [0002] Power cable failure is a common fault in the power system, and the power cable failure will show different degrees of partial discharge. The purpose of the partial discharge measurement of the cable is to understand the discharge of the cable and estimate its insulation performance during operation; the second is to find the location of the discharge point if an impermissible discharge is found. For the running cable, the severely discharged part can be replaced to ensure the safe operation of the line; for the cable being manufactured, if a certain section of the cable is found to have serious defects, on the one hand, the problem in the process can be found, on the other hand, the unqualified requirements can be removed The le...

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Application Information

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IPC IPC(8): G01R31/12G01R31/08
Inventor 熊俊陆国俊宁宇田立斌叶加骅
Owner GUANGZHOU POWER SUPPLY BUREAU GUANGDONG POWER GRID CO LTD
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