Method and system for monitoring mechanical state of on-load tap-changer based on multi-layer filter

A technology of on-load tap changer and mechanical state, which is applied in the testing of mechanical parts, the testing of machine/structural parts, circuit breaker testing, etc.

Active Publication Date: 2020-05-12
ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, considering the complexity of the mechanical structure of the transformer tap changer and the existence of unavoidable interference signals in the field operation environment, how to extract reasonable and effective characteristic indicators from the vibration signal during the tap changer switching process, and then realize the tap changer Accurate monitoring of switch mechanical status has always been a research difficulty

Method used

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  • Method and system for monitoring mechanical state of on-load tap-changer based on multi-layer filter
  • Method and system for monitoring mechanical state of on-load tap-changer based on multi-layer filter
  • Method and system for monitoring mechanical state of on-load tap-changer based on multi-layer filter

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Embodiment 1

[0084] This embodiment provides a method for monitoring the mechanical state of an on-load tap-changer based on a multilayer filter. The on-load tap-changer of a certain 35kV transformer is divided into test objects, and the vibration signal during the switching process is tested. Mechanical condition monitoring method for tap changers. figure 1 It is a schematic flow chart of the method of the present invention.

[0085] Method of the present invention comprises the steps:

[0086] (1) At the substation site, a vibration sensor is placed on the top of the transformer on-load tap-changer, connected to the vibration signal acquisition system, and the vibration signal x(k) is collected when the on-load switch is switched, and its length is N. Such as figure 2 shown.

[0087] (2) carry out normalization process to vibration signal x (k), obtain the vibration signal y (k) after normalization, described vibration signal normalization computing formula is:

[0088]

[0089] ...

Embodiment 2

[0136] This embodiment provides a multi-layer filter-based on-load tap-changer mechanical condition monitoring system, which includes:

[0137] Acquisition unit: collect the vibration signal during the switching process of the transformer on-load tap changer;

[0138] Normalization processing unit: normalize the vibration signal during the switching process of the on-load tap changer;

[0139] Fourier transform unit: perform discrete Fourier transform on the normalized vibration signal to obtain the frequency spectrum distribution of the vibration signal;

[0140] Multi-layer filter design unit: determine the quality factor according to the spectrum distribution, and design a multi-layer filter;

[0141] Sub-band signal matrix forming unit: input the spectrum distribution to the multi-layer filter to obtain multiple sub-band signals to form a sub-band signal matrix;

[0142] Modulus maximum vector calculation unit: calculate the covariance matrix of the subband signal matrix...

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Abstract

The invention provides an on-load tap-changer mechanical state monitoring method and system based on a multi-layer filter. The method comprises the steps of: acquiring vibration signals in a switchingprocess of an on-load tap-changer; performing normalization processing on the vibration signals; performing discrete Fourier transform on the vibration signals subjected to normalization to obtain frequency spectrum distribution of the vibration signals; determining a quality factor according to the frequency spectrum distribution and designing a multi-layer filter; inputting the frequency spectrum distribution to the multi-layer filter to obtain a plurality of sub-band signals to form a sub-band signal matrix; calculating a covariance matrix of the sub-band signal matrix according to columnsand the modulus maximum of the covariance matrix; calculating the statistical magnitude of the modulus maximum and the control limit of the statistical magnitude; judging the mechanical state of theon-load tap-changer according to the statistical magnitude. The method and the system can diagnose the mechanical work state of a tap-changer of a transformer and can detect whether the mechanical state of a tap-changer of a transformer changes effectively and accurately, so that effective measures can be adopted for a tap-changer timely.

Description

technical field [0001] The invention relates to the field of monitoring the mechanical state of a tap changer, in particular to a method and system for monitoring the mechanical state of a transformer on-load tap changer based on a multilayer filter. Background technique [0002] The transformer is one of the most important equipment in the power system, and its operation stability has a great influence on the safety of the power system. The on-load tap-changer is the only movable part of the transformer, which can change the voltage transformation ratio under the load condition, realize the adjustment of the system voltage under the condition of uninterrupted power supply, realize the compensation of voltage fluctuation, adjust the power, improve the system performance and improve the electric energy Important features such as quality. However, with the increase of tap changer voltage adjustment times, its failure rate also increases. The faults of on-load tap-changers ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/327G01M13/00
CPCG01M13/00G01R31/327
Inventor 郑一鸣何文林刘浩军汪卫国孙翔詹江杨王绍安杨智陈珉陈孝信邵先军王文浩吴胥阳王丰华谢方鑫张君
Owner ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY
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