A High-Precision Cable Fault Location Method Based on Characteristic Parameter Adjustment of Wave Velocity

A technology of characteristic parameters and positioning method, which is applied in the direction of fault location, fault detection according to conductor type, measurement of electricity, etc., can solve problems such as wave velocity fixed error, achieve high-precision positioning, reliable signal strength, and meet the calculation requirements.

Active Publication Date: 2022-04-05
WUHAN SUNSHINE POWER SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] Aiming at the problems existing in the prior art, the present invention discloses a high-precision positioning method for cable faults based on characteristic parameters to adjust wave speeds, which can solve errors caused by fixed wave speeds in cable fault current traveling wave positioning, and avoid frequency division processing and other complex operations

Method used

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  • A High-Precision Cable Fault Location Method Based on Characteristic Parameter Adjustment of Wave Velocity
  • A High-Precision Cable Fault Location Method Based on Characteristic Parameter Adjustment of Wave Velocity
  • A High-Precision Cable Fault Location Method Based on Characteristic Parameter Adjustment of Wave Velocity

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Embodiment 1

[0057] Such as figure 1 As shown, a cable fault high-precision positioning method based on characteristic parameters to adjust the wave velocity, the cable to be tested is provided with a monitoring interval that meets the preset transmission distance; the cable fault high-precision positioning method includes:

[0058] Step S1, generating test pulses multiple times and inputting them into the monitoring interval of the cable to be tested, and collecting test waveform data of all test traveling waves passing through the monitoring interval.

[0059] Specifically, the methods of generating traveling wave signals outside the cable monitoring section include faults outside the section, line closing action, external injection, etc. Sensor monitoring records. For example, use a Rogowski coil traveling wave current sensor installed at both ends of the cable monitoring section, and record faults outside the section, line closing action traveling waves through actual measurement, or ...

Embodiment 2

[0085] The cable fault high-precision positioning method based on the first embodiment above is a specific embodiment of the method.

[0086] When a traveling wave propagates in a cable, traveling wave dispersion and attenuation naturally occur, resulting in a decrease in intensity and a slowing of the rising edge. As the propagation distance increases, the traveling wave continues to attenuate and widen, and the wave speed becomes lower. Lost to undetectable after a kilometer. The waveform changes in the process of traveling wave transmission are as follows: Figure 5 shown.

[0087] In the wave speed preparation stage, pulses are artificially injected into the cable from outside the detection interval through the discharge equipment, or the fluctuations or faults outside the interval after initial installation are collected in series into the traveling wave, and the formed traveling wave is transmitted in the cable and detected by the detection sensors at both ends. Pulse ...

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Abstract

A high-precision positioning method for cable faults based on characteristic parameters to adjust the wave velocity, involving the field of power equipment status monitoring and fault protection, including: obtaining wave velocity-characteristic parameter list, characteristic parameter-transmission distance list through preprocessing; collecting fault current traveling wave actual measurement Waveform data, processed to obtain the measured time difference data of the measured wave heads at both ends, and obtained the measured characteristic parameters according to the measured waveform data processing, query the wave velocity-characteristic parameter list to obtain the zero-order wave velocity, and process the zero-order wave velocity according to the double-ended traveling wave positioning formula to obtain Zero-level positioning distance; and according to the zero-level positioning distance data processing, the fault characteristic parameters are obtained, and the representative value of the parameter and the representative wave velocity are comprehensively formed, and then the precise positioning distance is calculated. The invention can realize high-precision and fast positioning of cable fault points.

Description

technical field [0001] The invention relates to the technical field of state monitoring and fault protection of electric equipment, in particular to a high-precision positioning method for cable faults based on characteristic parameter adjustment of wave velocity. Background technique [0002] The accuracy of wave velocity in cable fault location is an important factor affecting the positioning accuracy. There are two basic ways to obtain wave velocity: theoretical calculation and test measurement. The existing wave velocity acquisition schemes are as follows: [0003] (1) Directly calculate and determine the wave velocity of the line according to the line parameters, and then locate the mixed line after determining the traveling wave transmission time in each section of the line. The calculation parameters are affected by the complex conditions on the site, which may lead to large deviations. [0004] (2) The wave velocity is calculated by using the time difference of mult...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08
CPCG01R31/083G01R31/088
Inventor 陈继东余刚华覃晓陈沛琳马波
Owner WUHAN SUNSHINE POWER SCI & TECH
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