Three-phase linkage circuit breaker excitation surge current suppression method based on switching control

A technology of inrush current and circuit breaker, applied in the field of inrush current of transformers, can solve the problems of eliminating inrush current, increasing external equipment, increasing costs, etc., to achieve the effect of realizing inrush current, suppressing inrush current, and reducing cost

Active Publication Date: 2019-09-24
成都法瑞克电气科技有限公司
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Problems solved by technology

Practice has proved that these measures to suppress the inrush current have shortcomings: on the one hand, these solutions need to increase the external equipment and increase the cost; on the other hand, these methods only reduce the amplitude of the inrush current, and do not fundamentally eliminate the excitation surge

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  • Three-phase linkage circuit breaker excitation surge current suppression method based on switching control
  • Three-phase linkage circuit breaker excitation surge current suppression method based on switching control
  • Three-phase linkage circuit breaker excitation surge current suppression method based on switching control

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[0042] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0043] like figure 1 and 2 As shown, it is a schematic flow chart and a schematic diagram of the principle of the method for suppressing the excitation inrush current of the three-phase linkage circuit breaker based on the opening and closing control of the present invention; a method for suppressing the excitation inrush current of the three-phase linkage circuit breaker based on the opening and closing control includes the following steps :

[0044] S1. Select one phase of the three-phase transformer as the reference phase, and determine the zero-crossing point of the positive-phase voltage of ...

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Abstract

The invention discloses a three-phase linkage circuit breaker excitation surge current suppression method based on switching control. The method comprises the steps: selecting a reference phase in a three-phase transformer, determining an optimal switching-off phase according to a target residual magnetism mode, selecting the optimal switching-off phase for simultaneous switching-off, collecting a winding voltage signal when the optimal switching-off phase is used for switching-off, calculating iron core residual magnetism, and determining the optimal switching-on time of the three-phase linkage circuit breaker. According to the method, the set residual magnetism mode is obtained by controlling switching-off, then the three-phase voltage during switching-off is collected, the three-phase residual magnetism is obtained through integral calculation, and the optimal switching-on time is calculated according to the residual magnetism, so that on the one hand, the cost required for restraining the magnetizing inrush current can be reduced, and on the other hand, the effect of restraining the magnetizing inrush current can be effectively achieved.

Description

technical field [0001] The invention belongs to the technical field of transformer excitation inrush current, and in particular relates to a method for suppressing excitation inrush current of a three-phase linkage circuit breaker based on opening and closing control. Background technique [0002] The power transformer is a very important electrical equipment in the power system. When the no-load transformer is turned on, a large amount of excitation inrush current will be generated instantly. Exciting inrush current is an asymmetric inrush current generated by transformer iron core flux saturation, and the exciting inrush current can reach 6-8 times of the rated current of the transformer at most. The existence of excitation inrush current will have many adverse effects such as: cause differential protection malfunction; large current in the winding will reduce the life of the transformer; excitation inrush current will also generate a large number of harmonics, affecting p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/04H02H9/00
CPCH02H7/04H02H9/002
Inventor 方春恩唐小雨曾俊龙陈川江张彼德李伟
Owner 成都法瑞克电气科技有限公司
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