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A Partial Discharge Locating Method Based on Frequency Variation of Phase Velocity

A technology of partial discharge and positioning method, which is applied in the direction of measuring electricity, fault location, measuring electrical variables, etc., can solve the problem of low precision, and achieve the effect of improving positioning accuracy, small average positioning error, and reducing influence

Active Publication Date: 2020-12-22
SICHUAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the above-mentioned deficiencies in the prior art, the present invention provides a partial discharge location method based on the phase velocity frequency variation characteristic, which solves the problem of low accuracy of the existing partial discharge location method

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  • A Partial Discharge Locating Method Based on Frequency Variation of Phase Velocity
  • A Partial Discharge Locating Method Based on Frequency Variation of Phase Velocity
  • A Partial Discharge Locating Method Based on Frequency Variation of Phase Velocity

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Embodiment Construction

[0059] The specific embodiments of the present invention are described below so that those skilled in the art can understand the present invention, but it should be clear that the present invention is not limited to the scope of the specific embodiments. For those of ordinary skill in the art, as long as various changes Within the spirit and scope of the present invention defined and determined by the appended claims, these changes are obvious, and all inventions and creations using the concept of the present invention are included in the protection list.

[0060] Such as figure 1 As shown, the partial discharge localization method based on the phase velocity frequency variation characteristics includes the following steps:

[0061] S1. Perform a partial discharge test on the target cable to obtain the corresponding direct wave and reflected wave;

[0062] S2. Separating the direct wave and the reflected wave in the time domain, respectively obtaining a waveform corresponding...

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Abstract

The invention discloses a method for locating partial discharge based on the frequency-varying characteristics of phase velocity, which first determines the dominant frequency band of the PD waveform signal, and then combines the phase of the PD waveform in the set frequency band with the phase velocity of the cable to propose a new positioning curve , and finally use the slope of the location curve to determine the location of the PD source. This method improves the traditional phase difference PD positioning method by using the frequency-varying characteristics of the phase velocity, and can effectively improve the positioning accuracy of the partial discharge source. This method takes into account the characteristics of the distribution of noise-polluted PD frequency bands, and only analyzes the dominant frequency band of PD signals, so it can effectively reduce the impact of noise on positioning accuracy. This method does not need to determine the time of arrival, so the positioning accuracy is less affected by the sampling rate of the equipment. Compared with the traditional PD localization method, this method has stronger robustness. The method has high positioning accuracy and can be used for on-site PD positioning.

Description

technical field [0001] The invention relates to the field of cable defect detection, in particular to a partial discharge location method based on the phase velocity frequency variation characteristics. Background technique [0002] In recent years, with the rapid development of my country's urban power grid, the transmission system of the urban power grid has begun to use a large number of cross-linked polyethylene (XLPE) power cables. However, the harsh and complex laying environment and irregular construction operations may lead to local defects in the power cables, which will cause power outages and affect the normal operation of the urban power grid. The existing precise positioning technology of partial discharge (Partial Discharge, PD) source can obtain the position of local defect in the power cable, so as to guide the operation and maintenance personnel to focus on monitoring or replacing the position to ensure the normal operation of the power transmission system. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/12G01R31/08G01R31/11G01R23/16
CPCG01R23/16G01R31/083G01R31/088G01R31/11G01R31/1272
Inventor 朱光亚周凯饶显杰
Owner SICHUAN UNIV