Transformer remanence detection and demagnetization method and device

Abstract

The invention discloses a transformer remanence detection and demagnetization method which comprises the following steps: collecting residual flux content of a test transformer, and inputting the residual flux content into an intelligent analysis system; reading the residual flux content of the test transformer through a human-computer interaction interface, and inputting corresponding control instructions; controlling the output of a frequency conversion voltage-regulating unit through the control instructions; and outputting by the frequency conversion voltage-regulating unit a low-frequency AC voltage required for demagnetization, and carrying out demagnetization on the test transformer. The invention also discloses a transformer remanence detection and demagnetization device which comprises an AC power supply module, a power supply conversion module, a DC power supply module, a control acquisition module, the frequency conversion voltage-regulating unit, a man-machine interaction unit, a data acquisition module, the intelligent analysis system and the test transformer. The low-frequency AC voltage is utilized for demagnetization, thereby reducing power capacity and size of the demagnetization device; and through the man-machine interaction unit, operation personnel can obtain the demagnetization processing progress accurately and visually, and input the corresponding control instructions, thereby realizing thorough demagnetization of the test transformer.

Description

technical field [0001] The invention relates to the technical field of power equipment, in particular to a method and device for detecting and degaussing residual magnetism of a transformer. Background technique [0002] With the rapid development of the national economy, the scale of the power system continues to expand, which puts forward higher requirements for the safety and reliability of power equipment. As the "heart" of the entire power grid, the power transformer is the key equipment for the safe and stable operation of the power system. [0003] The DC resistance will be measured after on-site transformer handover, overhaul and failure. When testing the DC resistance of a large-capacity transformer winding, the time constant becomes larger due to the large capacity and inductance of the transformer and the small equivalent resistance. Therefore, the DC resistance test process requires a long time. The magnetic induction intensity B of the silicon steel sheet used...

AI Technical Summary

Problems solved by technology

At present, the methods used at home and abroad mainly include AC degaussing method and DC degaussing method. In the field test, the AC degaussing method uses AC power supply equipment, which is heavy and inconvenient to transport, and the AC degaussing method cannot accurately judge the final result of degaussing.

However, the DC degaussing method is difficult to optimally control the time of forward and reverse DC attenuation gears and the degaussing procedure, resulting in incomplete degaussing.

These two methods roughly judge the final result of degaussing, but do not consider the size of residual magnetism from the perspective of residual magnetism detection, so it is impossible to accurately determine the final result of transformer degaussing. Therefore, it is necessary to design a final solution that can accurately detect residual magnetism The degaussing device is small and easy to transport on site, that is, the integrated device of residual magnetism detection and low frequency degaussing

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