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Defect type identifying method for GIS oscillation impulse voltage withstanding test

A technology of vibration shock and withstand voltage test, applied in the direction of testing dielectric strength, etc., can solve the problems of partial discharge detection and insulation evaluation, and achieve high reliability and practicability

Active Publication Date: 2017-08-11
SHANGHAI MUNICIPAL ELECTRIC POWER CO +1
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AI Technical Summary

Problems solved by technology

At present, there are not many studies on partial discharge detection and insulation evaluation under oscillating impulse voltage, and there are few reports on the type of partial discharge under impulse voltage by spectrogram construction and identification methods

Method used

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  • Defect type identifying method for GIS oscillation impulse voltage withstanding test
  • Defect type identifying method for GIS oscillation impulse voltage withstanding test
  • Defect type identifying method for GIS oscillation impulse voltage withstanding test

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Embodiment Construction

[0048] based on the following Figure 1 to Figure 5 , specifically explain the preferred embodiment of the present invention.

[0049] Such as figure 1 As shown, the present invention provides a signal detection system for GIS oscillation shock withstand voltage test, comprising:

[0050] Electrically connected to the oscillating impact high-voltage power supply 3 of the GIS test object 7;

[0051] The impact high voltage control unit 2 electrically connected to the oscillating impact high voltage power supply 3;

[0052] Electrically connect the oscillating impact high-voltage power supply 3 and the capacitive voltage divider 4 of the GIS test product 7;

[0053] Electrically connected to the current detection module 6 of the GIS test product 7;

[0054] A UHF sensor 8 electrically connected to the GIS test object 7;

[0055] A collection and storage device 5 electrically connected to the capacitive voltage divider 4, the current detection module 6 and the UHF sensor 8; ...

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Abstract

A defect type identifying method for a GIS oscillation impulse voltage withstanding test forms a pulse waveform-time series by extracting a single pulse time-domain waveform and a corresponding discharge time by using a custom pulse extraction window; uses an equivalent periodic folding algorithm to form an equivalent phase-peak distribution chart according to the pulse waveform-time series; uses a statistical operator to extract feature parameters of the equivalent phase-peak distribution chart to form a discharge fingerprint, and processes the discharge fingerprints of different discharge defects to form a discharge fingerprint database; uses a BP neural network to train the discharge fingerprint database to form a discriminant function F; and uses the discriminant function F to calculate the discharge fingerprint of a defective GIS specimen to be discriminated, and identifies the type of a defect. The method can effectively identify the type of defects of partial discharge under an oscillation impulse voltage, and the reliability and practicability are high.

Description

technical field [0001] The invention relates to a defect type identification method for a GIS vibration shock withstand voltage test. Background technique [0002] Gas-insulated metal fully-enclosed switchgear (GIS) is more and more widely used in power grids. With the large-scale construction of power grids, more and more power outages are caused by GIS insulation failures. In order to improve the reliability of GIS operation Relevant standards recommend on-site impulse voltage withstand test for GIS equipment. IEC60060-3 recommends the use of high-efficiency oscillatory impulse voltage as the voltage waveform of the on-site withstand voltage test. Partial discharge measurement is carried out at the same time as the impulse withstand voltage test, and the overall insulation strength and local insulation state of the GIS equipment can be obtained, so as to conduct a comprehensive evaluation of the equipment insulation. At present, there are not many studies on partial disc...

Claims

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Application Information

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IPC IPC(8): G01R31/12
Inventor 张勇周彦刘斌肖广辉查坚卿张善福朱丹妮姚明强
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO
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