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Method and system for eliminating magnetizing inrush current of transformer

An excitation inrush current and transformer technology, which is applied to emergency protection circuit devices, electrical components, circuit devices, etc. for limiting overcurrent/overvoltage, can solve the problems of destroying the power supply end system, large differences, etc., to reduce the excitation inrush current. Effect

Inactive Publication Date: 2022-01-28
深圳法拉能源科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the transformer is re-closed and energized, the phase of the magnetic field generated by the current at the power supply terminal and the phase generated by the magnetic domain are very different or opposite, and an exciting inrush current will occur.
The strong current generated by the inrush current may be dozens of times the current of the power supply end, thus destroying the power supply end system, which needs to be further improved

Method used

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  • Method and system for eliminating magnetizing inrush current of transformer
  • Method and system for eliminating magnetizing inrush current of transformer
  • Method and system for eliminating magnetizing inrush current of transformer

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Embodiment Construction

[0051] The following is attached Figure 1-11 The application is described in further detail.

[0052] In order to make the purpose, technical solutions and advantages of this application clearer, the following in conjunction with the attached Figure 1-11 And embodiment, this application is described in further detail. It should be understood that the specific embodiments described here are only used to explain the present application, not to limit the present application.

[0053] refer to figure 1 , a transformer excitation inrush current elimination method disclosed in an embodiment of the present application, specifically includes:

[0054] S1. When it is detected that the transfer switch at one of the power supply terminals is opened, the current data of the power supply terminal is detected.

[0055] Specifically, in this embodiment, there are three types of power supply terminals, which are commercial power, UPS and diesel generators. When an abnormality or power ...

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Abstract

The invention relates to a method and a system for eliminating magnetizing inrush current of a transformer. The method comprises the following steps: detecting the current data of a power supply end when detecting that a change-over switch device at one power supply end is switched off; calculating an opening moment according to the power supply end current data, and obtaining transformer end voltage data through the opening moment, wherein the transformer end voltage data comprise the transformer end voltage size and the transformer end voltage phase; selecting the other type of power supply end according to a preset power supply end priority rule, and detecting power supply end voltage data of the other type of power supply end in real time, wherein the power supply end voltage data comprise the power supply end voltage size and the power supply end voltage phase; and judging whether the power supply end voltage data is equal to the transformer end voltage data, and when the power supply end voltage data is equal to the transformer end voltage data, sending a closing instruction to the change-over switch for closing. The method and the system have the effect of reducing the magnetizing inrush current generated after the transformer is reclosed and electrified.

Description

technical field [0001] The present application relates to the technical field of power transformer control and protection, in particular to a method and system for eliminating excitation inrush current of a transformer. Background technique [0002] The iron core of the transformer is generally made of silicon steel sheet. Silicon steel sheet is a soft magnetic material. The magnetic domains inside the soft magnetic material are disorderly and disorderly. Generally, it does not appear magnetic to the outside. However, after the transformer is energized to generate a magnetic field, the magnetic field begins to affect the magnetic domains in the iron core, and the magnetic domains deflect in the same direction, thereby generating an electric potential. When the transformer is turned off, the current disappears, but the magnetic domains still need a period of time before their magnetic will disappear. [0003] The transformer is generally installed between the load and the po...

Claims

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Application Information

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IPC IPC(8): H02H7/04H02H9/02
CPCH02H7/04H02H9/02
Inventor 冯海洋于硕峰张爱国
Owner 深圳法拉能源科技有限公司