Method for restraining no-load closing magnetizing inrush current of transformer

A technology of no-load closing and excitation inrush current, which is applied in the direction of converting AC power input to AC power output, conversion equipment that can be converted to DC without intermediate conversion, and output power conversion devices, etc., which can solve the problem that the suppression effect is not optimal And other issues

Active Publication Date: 2014-08-13
XI AN JIAOTONG UNIV +2
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  • Summary
  • Abstract
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Problems solved by technology

In practice, such methods often have suboptimal suppression effects.

Method used

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  • Method for restraining no-load closing magnetizing inrush current of transformer
  • Method for restraining no-load closing magnetizing inrush current of transformer
  • Method for restraining no-load closing magnetizing inrush current of transformer

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Embodiment Construction

[0056] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0057] Such as figure 1 As shown, the single-phase transformer is used as the object to carry out the simulation verification of the closing strategy, where U 1 ,U 2 are the transformer primary winding voltage and secondary winding voltage respectively, i 1 ,i 2 are the injection current of the primary winding of the transformer and the injection current of the secondary winding respectively, and ψ is the flux linkage of the transformer core. figure 2 It is the overall scheme diagram of the method of the present invention. The voltage and current information of the primary winding is collected through the TA current transformer and the TV voltage transformer. Through the phase selection closing technology described in the present invention, the best closing phase angle is selected, and then the QF is controlled. The circuit break...

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Abstract

The invention provides a method for restraining no-load closing magnetizing inrush current of a transformer. A power-factor angle of the transformer at the opening moment is measured and used as a basis for selecting the optimal closing phase angle, and mechanical properties of a disconnector are considered to determine the optimal target phase angle and to carry out no-load closing operation on the transformer. According to the method for restraining the no-load closing magnetizing inrush current of the transformer, an arc quenching property of the disconnector is considered, the voltage phase angle at the opening moment is determined according to the power-factor angle so that residual magnetism can be estimated, and key parameters are acquired in a simple, convenient and effective way; meanwhile, the method is combined with the controlled switching technology, the optimal target phase angle is selected to conduct switching on the transformer, supersaturation of an iron core of the transformer is prevented, and the magnetizing inrush current is restrained fundamentally.

Description

technical field [0001] The invention belongs to the technical field of suppressing excitation inrush current of transformers, and in particular relates to a method for suppressing excitation inrush current of transformer no-load closing. Background technique [0002] The power transformer is an extremely important electrical main equipment in the power system. Whether it can work normally is directly related to the continuous and stable operation of the power system. If the transformer is damaged due to a fault, it will be difficult to repair and the repair cycle will be long, which will not only affect the normal operation of the power system. , and even cause immeasurable economic losses and social impacts. When the transformer is turned on with no load or the voltage recovers after the external fault is removed, a large current will be generated on the side of the transformer voltage mutation, which is the excitation inrush current. Exciting inrush current may cause malf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P13/00
Inventor 郝治国张保会谭婷月刘志远韦鹏
Owner XI AN JIAOTONG UNIV
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