Method and device for diagnosing on-load tap switch

A technology of on-load tap-changing and switching, which is applied in the direction of measuring devices, instruments, character and pattern recognition, etc., and can solve the problems of long diagnosis time and poor reliability

Inactive Publication Date: 2017-11-07
STATE GRID SHANDONG ELECTRIC POWER +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Therefore, the technical problem to be solved by the embodiment of the present invention is that the diagnosis method of the on-load tap changer in the prior art has a long diagnosis time and poor reliability.

Method used

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  • Method and device for diagnosing on-load tap switch
  • Method and device for diagnosing on-load tap switch
  • Method and device for diagnosing on-load tap switch

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Embodiment 1

[0032] This embodiment provides a method for constructing an on-load tap-changer diagnostic model, such as figure 1 As shown, the construction method includes the following steps:

[0033] S1. Obtain a first vibration signal when the switch is in a preset fault state and a second vibration signal when the switch is in a normal working state. The preset fault status here includes the electrical fault and mechanical fault of the on-load tap-changer. Bit switch failure, switch refusal to cut, suspension or action lag, internal fastener loosening and falling off, and internal leakage, etc., the embodiment of the present invention can choose one or more faults in the preset fault state to correspond to the above-mentioned first vibration signal. The vibration signals of normal working state and fault state collected by the sensor of the on-load tap-changer (OLTC) are used for Independent Component Correlation Algorithm (ICA).

[0034] S2. Extract independent component vectors fr...

Embodiment 2

[0046] This embodiment provides a diagnostic method for on-load tap-changers, such as Image 6 shown, including:

[0047] S61. Obtain a vibration signal of the switch. During the working process of the on-load tap-changer, it is a vibration signal formed by mixing and superimposing a variety of independent signal sources, process noise and interference. The mixed vibration signal is collected by the OLTC sensor, and the Independent Component Correlation Algorithm (ICA) is performed.

[0048] S62. Extract independent component vectors from the vibration signal. Because the basic idea of ​​independent component analysis (ICA) is to assume that the process measurement signal is composed of some mutually independent signal sources, process noise and interference, and to separate the process measurement information from the process measurement information as much as possible according to the principle of information theory. Independent characteristic signal process. Such as f...

Embodiment 3

[0072] This embodiment provides a device for constructing a diagnosis model of an on-load tap changer. The device for constructing such as Figure 7 shown, including:

[0073] An acquisition module 71, configured to acquire a first vibration signal when the switch is in a preset fault state and a second vibration signal when the switch is in a normal working state;

[0074] An extraction module 72, configured to extract independent component vectors from the first vibration signal and the second vibration signal respectively;

[0075] The calculation module 73 is used to calculate the independent component vectors extracted from the first vibration signal and the second vibration signal respectively, to obtain the statistics and square prediction error of the independent component vectors;

[0076] Judgment module 74, for judging whether the statistic and the square prediction error are greater than the preset trust limit corresponding to it;

[0077] The projection module 7...

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Abstract

The invention discloses a method and device for diagnosing an on-load tap switch. The method for diagnosing an on-load tap switch comprises the steps of acquiring a vibration signal of the switch; extracting an independent component vector from the vibration signal; calculating the statistic and a squared prediction error of the independent component vector; judging whether the statistic and the squared prediction error are greater than corresponding preset confidence limits or not; when the statistic and the squared prediction error are greater than the corresponding preset confidence limits, projecting the independent component vector on multiple sections of a high-dimensional space, and obtaining independent component vector parameters of the vibration signal are acquired on the projection plane; and determining whether the switch has a fault or not according to the independent component vector parameters. According to the invention, the independent component vector is extracted from the vibration signal, and comparison with data parameters of a normal operating state is performed by combining an independent component analysis algorithm and a support vector machine classification algorithm, so that the fault is recognized quickly, the time for diagnosing the fault online is shortened, and the efficiency of fault diagnosis is improved.

Description

technical field [0001] The invention relates to the field of fault diagnosis of electrical equipment, in particular to a method and device for diagnosing an on-load tap changer. Background technique [0002] As power transformers are widely used in power grids or power transmission substations, the faults of on-load tap changers in power transformers increase accordingly. Because the on-load tap changer is a switching device that provides a constant voltage for the power transformer when the load changes, with the increase in the number of voltage adjustments, mechanical or electrical failures of the on-load tap changer (OLTC) increase accordingly. According to relevant statistics, mechanical failures of on-load tap-changers account for more than 70% of the total failures. [0003] At present, mechanical faults are the main fault types of power transformer on-load tap-changers, mainly including: drive shaft fracture, main spring fatigue, refusal to move and slipping phenom...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M13/00G06K9/62
CPCG01M13/00G06F18/21342G06F18/2411
Inventor 刘永亮胡东贾亚军黄锐郑强王林峰阎振坤吕俊涛史蕾玚吴博崔建张鹏刘芮辰
Owner STATE GRID SHANDONG ELECTRIC POWER
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