On-load tap-changer mechanical state monitoring method based on energy contribution degree

Abstract

The invention discloses an on-load tap-changer mechanical state monitoring method based on the energy contribution degree, and relates to the technical field of transformer on-load tap-changers. Vibration signals in the switching process of an on-load tap-changer are collected; fourier transform is carried out on the vibration signals to obtain vibration signal frequency spectrum distribution; constructing a vibration narrow-band signal sequence represented by a frequency domain according to the vibration signal spectrum distribution; designing a multi-layer filter bank according to the vibration narrow-band signal sequence, and calculating a sub-band energy sequence group of signals output by the vibration narrow-band signal sequence through the multi-layer filter bank; calculating a contribution degree sequence of the sub-band energy sequence group; calculating a similarity coefficient between the historical vibration signal contribution degree sequence and the current vibration signal contribution degree sequence when the same gear of the on-load tap-changer is switched; and the mechanical state of the on-load tap-changer is judged through the similarity coefficient, so that accurate monitoring of the mechanical state of the on-load tap-changer is realized through the vibration signal in the gear switching process of the on-load tap-changer.

Description

technical field [0001] The invention belongs to the technical field of transformer on-load tap changers, in particular to a method for monitoring the mechanical state of an on-load tap changer based on energy contribution. Background technique [0002] The on-load tap-changer is the only movable key component of the on-load tap changer. It can change the voltage transformation ratio under load conditions, realize the adjustment of the system voltage under the condition of uninterrupted power supply, and realize compensation for voltage fluctuations, power regulation, and improvement of power. important functions such as system performance and improving power quality. However, with the increase in the service life of the on-load tap-changer and the increase in the number of voltage adjustments, the failure rate also increases. According to statistics, the fault types of the on-load tap-changer mainly include electrical faults and mechanical faults, and mechanical faults are ...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for monitoring the mechanical state of on-load tap-changers based on energy contribution, thereby overcoming the existing shortcomings of difficulty in monitoring the mechanical state of on-load tap-changers

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