On-line monitoring and diagnosis method and device for tap switch and storage medium

Abstract

The invention discloses an on-line monitoring and diagnosing method and device for a tap switch and a storage medium. The method comprises the steps of: respectively obtaining monitoring waveforms ofthe odd number side and the even number side of a selector switch in an on-load tap switch; building an electromagnetic transient simulation model of the tapping switch, and carrying out the simulation of the normal switching of the on-load tapping switch, and obtaining the simulation waveforms of the odd and even sides of the switching switch of the on-load tapping switch; judging whether the internal electrical state and the mechanical state of the on-load tap-changer are normal or not according to the monitoring waveform and the simulation waveform; if the working state of the on-load tap-changer is judged to be normal, ending; otherwise, comparing with the fault simulation waveform in the fault simulation waveform library, or setting new fault re-simulation calculation until the simulation waveform consistent with the monitoring waveform characteristics is obtained, and determining the fault reason. According to the invention, on the premise of not changing the original wiring andstructure of the tapping switch, the internal electrical quantity of the switch is monitored in real time, and the working state of the on-load tapping switch is diagnosed through simulation comparison.

Description

technical field [0001] The invention relates to the technical field of electric equipment monitoring, in particular to an on-line monitoring and diagnosis method, device and storage medium of a tap changer. Background technique [0002] The on-load tap changer is the core component of the transformer. It has the function of stabilizing the center voltage of the load and regulating the reactive power flow in the AC system. ratio and increase the flexibility of grid control. As the only movable part of the transformer, the on-load tap-changer has high requirements on insulation and mechanical reliability. According to statistics, on-load tap changer faults caused by tap changer faults account for more than 30% of the total faults, and once a fault occurs, there is a lack of necessary fault recording data to support fault analysis. [0003] In order to grasp the working state of the on-load tap-changer, the existing on-line monitoring of the tap-changer mainly uses methods su...

AI Technical Summary

Problems solved by technology

However, these measurement methods are based on the monitoring of indirect quantities, which cannot reflect the electrical faults and initial defects inside the on-load tap-changer, so that the operation and maintenance personnel cannot grasp the working status of the on-load tap-changer accurately and in real time, increasing grid operation risk

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