Mechanical fault diagnosis method for transformer on-load tap-changer

A technology for on-load tapping and mechanical faults, which is applied in the testing of mechanical components, instruments, computer components, etc., can solve the problems of reducing the effect of EMD algorithm feature extraction, achieve suppression of modal aliasing, and improve self-adaptability , Solve the effect of modal aliasing

Inactive Publication Date: 2019-09-27
STATE GRID HEBEI ELECTRIC POWER RES INST +1
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Problems solved by technology

This phenomenon will reduce the feature extraction effect of the EMD algorithm.

Method used

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  • Mechanical fault diagnosis method for transformer on-load tap-changer
  • Mechanical fault diagnosis method for transformer on-load tap-changer
  • Mechanical fault diagnosis method for transformer on-load tap-changer

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Embodiment Construction

[0031] The present invention will be further described in detail below with reference to the accompanying drawings, so that those skilled in the art can implement it with reference to the description.

[0032] The invention provides a method for diagnosing mechanical faults of a transformer on-load tap-changer, comprising the following steps:

[0033] Step S110: measuring the multi-channel vibration signal in the OTLC switching process;

[0034] In this embodiment, three piezoelectric acceleration sensors with a sensitivity of 500mV / g are selected to measure the vibration signals in three mutually perpendicular directions; such as figure 2 As shown, three piezoelectric acceleration sensors are respectively arranged on the top surface and two side surfaces of the transformer tank wall, so as to reduce the interference of the transformer vibration signal and reduce the installation difficulty.

[0035] The vibration signals during the OLTC switching process collected by the th...

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Abstract

The invention discloses a mechanical fault diagnosis method for a transformer on-load tap-changer. The method comprises the following steps of measuring multi-channel vibration signals in an OTLC switching process and carrying out EEMD decomposition and Hilbert transform to obtain a Hilbert marginal spectrum; constructing a Volterra model to obtain a coefficient vector; computing a singular value of a coefficient vector matrix; and identifying a mechanical state of the OTLC through a DAG-SVM. According to the method, improved Hilbert-Huang transform and the Volterra model of a chaotic time series are introduced, the phenomenon of modal aliasing in a signal decomposition process is inhibited, high-resolution characteristic parameters of non-stationary vibration signals can be quickly obtained, and the adaptability, the characteristic resolution and the identification efficiency of the mechanical fault diagnosis of the OTLC are improved.

Description

technical field [0001] The invention relates to a fault diagnosis method for an on-load tap-changer of a transformer, in particular to a method for diagnosing a mechanical fault of a transformer on-load tap-changer, and belongs to the technical field of fault diagnosis of power equipment. Background technique [0002] The transformer on-load tap-changer (OTLC) is an important component to ensure that the on-load tap changer can realize the voltage regulation function. Its reliability is directly related to the operation quality of the on-load tap changer and even the power transmission and distribution grid. OTLC is the only active part in the on-load voltage regulating transformer. In the process of increasing the number of voltage regulating times, the possibility of its failure shows an increasing trend. Statistics show that most of the on-load tap-changer faults are mechanical faults, such as poor contact of the contacts, jamming of the rotating shaft, etc., and the prop...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M13/00G06K9/00G06K9/62
CPCG01M13/00G06F2218/08G06F2218/12G06F18/2411
Inventor 高树国耿江海何瑞东王平邢超刘宏亮岳国良赵军
Owner STATE GRID HEBEI ELECTRIC POWER RES INST
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