Magnetizing inrush current suppression device and method for transformer

A technology of excitation inrush current and suppression device, applied in the field of transformers, can solve problems such as difficulty and complex excitation inrush current suppression, and achieve the effect of suppressing excitation inrush current, avoiding the influence of power quality, and having a small degree of dispersion.

Inactive Publication Date: 2020-04-10
ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID NINGXIA ELECTRIC POWER COMPANY +3
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Problems solved by technology

[0003] Embodiments of the present invention provide an excitation inrush current suppression device and method for transformers, so as to solve the complicated and difficult problems in the prior art for excitation inrush current suppression of transformers

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  • Magnetizing inrush current suppression device and method for transformer
  • Magnetizing inrush current suppression device and method for transformer
  • Magnetizing inrush current suppression device and method for transformer

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Embodiment Construction

[0020] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0021] The embodiment of the invention discloses an excitation inrush current suppressing device for a transformer. like figure 1 As shown, the excitation inrush suppression device includes: a controller ZK and three suppression units. Each suppression unit includes: a vacuum circuit breaker K1, a first voltage transformer T1, a second voltage transformer T2 and a spark gap K2.

[0022] For illustrative purposes, figure 1 Only the electrical ...

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Abstract

The embodiment of the invention discloses a magnetizing inrush current suppression device and method for a transformer. The magnetizing inrush current suppression device comprises a controller and three suppression units, and each suppression unit comprises a vacuum circuit breaker, a first voltage transformer, a second voltage transformer and a spark gap. The magnetizing inrush current suppression method comprises the steps of if the controller receives a closing instruction, enabling a second voltage transformer to collect the three-phase voltage of the transformer at the last power-off moment; calculating to obtain the three-phase residual magnetic flux of the transformer according to the three-phase voltage; calculating to obtain the three-phase closing time of the transformer according to the residual magnetic flux; enabling the controller to send a closing instruction to the spark gap and the vacuum circuit breaker of each suppression unit connected with the three phases of the transformer in sequence according to the closing time of the three phases of the transformer; and closing the spark gap and the vacuum circuit breaker of each suppression unit after the closing instruction is received. By controlling the vacuum circuit breakers to be closed in a time-sharing and phase-sharing manner and adopting a gap closing manner, the magnetizing inrush current can be suppressed.

Description

technical field [0001] The invention relates to the technical field of transformers, in particular to an excitation inrush current suppression device and method for transformers. Background technique [0002] When the transformer is closed with no load or light load, it will generate a large closing excitation inrush current, which can reach 6 to 8 times of the rated current, and can reach more than ten times in severe cases. The inrush current has the following hazards to the power grid: ①The transformer coil generates a large electromotive force, which may damage the connection between the coils and the connection between the coil and the terminal; ②Cause the relay protection to malfunction; negative effect. At present, there are mainly two methods for suppressing inrush current in transformers: ① Suppress the occurrence of inrush current through large-impedance switching; ② By identifying the inrush current of transformer no-load closing and the waveform characteristics ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/04H02H9/02
CPCH02H7/04H02H9/02
Inventor 艾绍贵李秀广王川刘锦辉樊益平吴旭涛刘志远马云龙丁培周秀马波鄢阳杜玮何宁辉刘世涛郝金鹏马飞越高博郝嘉银张庆平
Owner ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID NINGXIA ELECTRIC POWER COMPANY
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