Power transformer capable of eliminating excitation surge and application method thereof

A power transformer and magnetizing inrush current technology, applied in the field of power transformers, can solve the problems that the differential protection of the transformer cannot be guaranteed 100% without malfunction, the magnetizing inrush current of the transformer cannot be completely suppressed or eliminated, and the transformer cannot work normally, etc., so as to weaken the switching transient. The effect of stable electromagnetic effect, smooth elimination of excitation inrush current, and high reliability

Inactive Publication Date: 2019-07-26
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 cou

Method used

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  • Power transformer capable of eliminating excitation surge and application method thereof
  • Power transformer capable of eliminating excitation surge and application method thereof
  • Power transformer capable of eliminating excitation surge and application method thereof

Examples

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Embodiment 1

[0039] see Figure 1~2 , in an embodiment of the present invention, a power transformer capable of eliminating inrush current includes a transformer body 1; the transformer body 1 is integrated with a high-voltage winding 9 and a low-voltage winding 10, and the high-voltage winding 9 and the low-voltage winding 10 are respectively equipped with high-voltage terminals 7 and the low-voltage terminal 6, wherein the high-voltage terminal 7 is electrically connected to a high-voltage switch 11, and the low-voltage terminal 6 is electrically connected to a low-voltage switch 12 for controlling the input of high and low voltage currents;

[0040] The transformer main body 1 is also integrated with an electronic converter 2 and an auxiliary winding 3, and the electronic converter 2 includes a converter A4 for realizing AC / DC conversion and a converter B5 for realizing DC / AC conversion; The converter A4 is electrically connected to the auxiliary winding 3, and the converter B5 is elect...

Embodiment 2

[0044] see Figure 3-5 , in an embodiment of the present invention, a method for using the above-mentioned transformer includes a no-load closing stage and a fault removal stage,

[0045] The no-load closing stage includes:

[0046] 1-1) Close the low-voltage switch 12 and connect to the low-voltage winding 10;

[0047] 1-2) The AC current is injected into the low-voltage winding 10 by the converter A4 and an increasing AC magnetizing and modulating magnetic flux 13 is established (corresponding to Figure 4 time t0 in);

[0048] 1-3) When the core flux increases to the rated value of the synchronous flux (corresponding to Figure 4 At time t1 in ), the high voltage switch 11 is closed, and the high voltage winding 9 is connected.

[0049] After the high-voltage winding 9 is connected (corresponding Figure 4 Time t2 in), since there is already a steady-state magnetic flux in the iron core, the iron core of the transformer main body 1 will not generate excitation inrush cur...

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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...

Claims

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Application Information

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IPC IPC(8): H01F27/38H01F27/40H02H9/00H02H7/04
CPCH01F27/38H01F27/40H02H7/04H02H9/002
Inventor 陈志伟李红梅张莹莹刘立文王乾尉恬
Owner HEFEI UNIV OF TECH
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