Power transformer capable of eliminating excitation surge and application method thereof

Abstract

The invention discloses a power transformer capable of eliminating excitation surge, relates to the electrical field and is mainly used for eliminating an excitation surge phenomenon of a traditionaltransformer. The transformer comprises a transformer main body, wherein the transformer main body is integrated with a high-voltage winding and a low-voltage winding and is also integrated with an electronic converter and an auxiliary winding, the electronic converter comprises a converter A and a converter B, the converter A is used for achieving AC / DC conversion, the converter B is used for achieving DC / AC conversion, the converter A is electrically connected with the auxiliary winding, and the converter B is electrically connected with the low-voltage winding. According to a magnetism and demagnetism principle, the auxiliary winding is connected with the electronic converter to handle the excitation surge phenomenon of the transformer body; by magnetism and demagnetism operation on an iron core, the iron core stability of zero-distortion requirement of the transformer body is achieved, the links such as an external switch and residual magnetism measurement are omitted, and the magnetic field modulation is free from constraint of breaking and closing time.

Description

technical field [0001] The invention relates to the electrical field, in particular to a power transformer capable of eliminating excitation inrush current and a method for using the same. Background technique [0002] Transformer excitation inrush current means that when the transformer is charged at full voltage, when the residual magnetic flux in the iron core before input is in the same direction as the magnetic flux generated by the working voltage when the transformer is input, the total magnetic flux far exceeds the saturation magnetic flux of the iron core. transient currents generated in its windings. The characteristics of transformer excitation inrush current are: the size of the inrush current is related to factors such as the voltage phase angle of the grid when the transformer is put into operation, the residual magnetic flux of the transformer iron core, and the impedance of the power supply system. Peak value); and the inrush current contains DC components a...

AI Technical Summary

Problems solved by technology

A large number of studies have proved that any company and manufacturer, based on the characteristics of the excitation inrush current waveform, can not guarantee 100% non-maloperation of the transformer differential protection. The difference is only the number of times of misoperation.

[0006] To sum up, under the new situation, the stable operation of power transformers is also facing new challenges and threats. Due to the lack of effective countermeasures for the problem that the transformer cannot work normally caused by the inrush current, people have to take various "hidden" methods for a long time. , "Avoid" surge method

At the same time, due to the characteristics of the excitation inrush current, most people think that the excitation inrush current of the transformer cannot be completely suppressed or eliminated, and there are still some problems that need to be solved urgently.

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