Discriminating and measuring method for partial discharge modes of transformer

A technology of partial discharge and pattern recognition, applied in character and pattern recognition, instruments, testing dielectric strength, etc., can solve the problems of being easily affected by on-site interference, low measurement frequency, difficult diagnosis, etc., and achieve the effect of good engineering practical value

Inactive Publication Date: 2012-10-03
ANHUI UNIV OF SCI & TECH +1
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AI Technical Summary

Problems solved by technology

So far, the digital measurement is basically carried out for the pulse current method, which is tested according to the IEC60270 standard, which has many obvious advantages, but there are still some shortcomings: the measurement frequency is low (usually below 1MHz), and a large number of partial discharge characte

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  • Discriminating and measuring method for partial discharge modes of transformer
  • Discriminating and measuring method for partial discharge modes of transformer
  • Discriminating and measuring method for partial discharge modes of transformer

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Embodiment Construction

[0049] Such as Figure 1 ~ Figure 4 As shown, the measurement method for transformer partial discharge pattern recognition specifically includes the following steps:

[0050] 1) Build a partial discharge model:

[0051] According to the test results in the laboratory, the discharge types in the transformer are classified into five categories: paper (cardboard) internal void discharge, paper (cardboard) surface discharge, floating potential body discharge, oil bubble discharge, oil-barrier type discharge;

[0052] ①Construct the internal void discharge model of paper (cardboard)

[0053]Use plate-plate electrode 102 and test sample 1. Test sample 1 is two layers of 1.0mm thick oil-impregnated insulating cardboard 101 with a layer of 0.5-1.5mm thick insulating cardboard sandwiched between them. Test sample 1 is placed on the plate-plate electrode 102. The two plate electrodes are immersed in transformer oil; due to several layers of medium, there are a large number of air gap...

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Abstract

The invention discloses a discriminating and measuring method for partial discharge modes of a transformer. The method includes: measuring discharge conditions of different discharge modes in a measuring device, acquiring and analyzing measuring results to make spectrums, and calculating fingerprints to form a fingerprint database. For an unknown discharge mode of the transformer, the measuring device is used to acquire and analyze the unknown discharge modes to make a spectrum, calculated fingerprint of the unknown discharge mode can be compared with fingerprint information in the fingerprint database, and accordingly, the partial discharge mode of the transformer can be discriminated. By building up the fingerprint database of the partial discharge of the transformer and using information provided by various discharge spectrums, different discharge modes can be discriminated, and valuable data is provided for fingerprint diagnosis and mode discrimination technology. The method has excellent practical value in engineering, and reliability of the method can reach 99.5%.

Description

technical field [0001] The invention relates to the field of power transformer fault diagnosis, in particular to a measurement method for transformer partial discharge pattern recognition. Background technique [0002] The insulation structure of power transformers in operation is complex, and there are many types of internal discharge points and discharge types that may occur, usually as follows: [0003] (1) Oil gap discharge in the middle of the winding oil-baffle insulation; [0004] (2) Oil gap discharge at the end of the winding; [0005] (3) Oil gap discharge in contact with insulated wires and insulating paper (lead insulation, lap insulation); [0006] (4) Partial discharge in oil-paper insulation such as lead wires and lap wires; [0007] (5) Oil gap discharge between coils (longitudinal insulation); [0008] (6) Partial breakdown of inter-turn insulation; [0009] (7) The insulating paper slides and flashes along the surface. [0010] Most of the discharge p...

Claims

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Application Information

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IPC IPC(8): G01R31/12G06K9/62
Inventor 李梅杨岸高峻岭胡霞
Owner ANHUI UNIV OF SCI & TECH
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