Method, device and equipment for identifying partial discharge mode of high-voltage cable terminal

A partial discharge and pattern recognition technology, which is applied in the direction of measuring devices, measuring electricity, and measuring electrical variables, can solve the problems of affecting recognition accuracy, high dimensionality of feature quantities, and redundant information, so as to facilitate installation, reduce dimensions, and reduce The effect of information redundancy

Pending Publication Date: 2021-06-01
DAQING POWER SUPPLY COMPANY OF STATE GRID HEILONGJIANG ELECTRIC POWER COMPANY +2
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Problems solved by technology

At present, the method of feature extraction generally adopts the feature extraction method based on the phase-resolved partial discharge (PhaseResolved Partial Discharge, PRPD) statistical spectrum, such as the statistical feature analysis method based on the two-dimensional Fractal features, etc. The feature quantities obtained by this type of method have a high dimensionality, and there will be information redundancy, and problems such as overfitting are prone to occur, which will affect the recognition accuracy.

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  • Method, device and equipment for identifying partial discharge mode of high-voltage cable terminal
  • Method, device and equipment for identifying partial discharge mode of high-voltage cable terminal
  • Method, device and equipment for identifying partial discharge mode of high-voltage cable terminal

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[0049] In order to make the object, technical solution and advantages of the present invention clearer, the present invention is described below through specific embodiments shown in the accompanying drawings. It should be understood, however, that these descriptions are exemplary only and are not intended to limit the scope of the present invention. Also, in the following description, descriptions of well-known structures and techniques are omitted to avoid unnecessarily obscuring the concept of the present invention.

[0050] Such as figure 1 As shown, a specific embodiment of the present invention provides a method for recognizing a partial discharge pattern at a high-voltage cable terminal, comprising the following steps:

[0051] S1. Obtain the partial discharge signal of the cable terminal by using the high-frequency measurement method;

[0052] Typically, there are three types of discharge modes for cable terminations:

[0053] Needle plate discharge mode, defects su...

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Abstract

The invention discloses a method, a device and equipment for identifying a partial discharge mode of a high-voltage cable terminal, and belongs to the technical field of insulation monitoring of high-voltage power equipment. The method comprises the steps: obtaining partial discharge signals of the cable terminal by using a high-frequency measurement method; performing modal decomposition on the discharge signals to obtain an effective modal of the partial discharge signals; obtaining a feature matrix according to the effective mode; and inputting the feature matrix into a mode recognition model, and outputting the type of the partial discharge mode. The method is low in cost, convenient to install, accurate in partial discharge signal acquisition and high in pattern recognition accuracy.

Description

Technical field: [0001] The invention belongs to the technical field of insulation monitoring of high-voltage power equipment, and in particular relates to a method, device and equipment for recognizing partial discharge patterns of high-voltage cable terminals. Background technique: [0002] With the increase of the scale of the distribution network power supply system, the ring main unit gradually occupies an important position in the power system, and its safe and stable operation is of great significance to the safety of the power grid. Problems such as insulation defects or deterioration of the core cable terminals inside the ring network cabinet will directly endanger the normal operation of the equipment in the ring network cabinet and directly affect the power safety of the power grid. Partial discharge is an important sign and manifestation of insulation degradation at high-voltage cable terminals. Timely and accurate monitoring of partial discharge in ring main uni...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/12
CPCG01R31/1272
Inventor 马兴明刘骥郎宇宁毛新宇赵立胜孙国强张宁陈立明于梦李书田
Owner DAQING POWER SUPPLY COMPANY OF STATE GRID HEILONGJIANG ELECTRIC POWER COMPANY
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