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An adaptive excitation inrush current suppression device and method

A technology of excitation inrush current and suppression device, which is applied in the output power conversion device, emergency protection circuit device, and the conversion of AC power input to AC power output, etc., can solve problems such as excitation inrush current

Active Publication Date: 2017-10-20
YANGZHOU POWER SUPPLY CO OF STATE GRID JIANGSU ELECTRIC POWER CO +3
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Problems solved by technology

This method can solve the excitation inrush current problem when the power transformer is switched on without load in various states

Method used

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  • An adaptive excitation inrush current suppression device and method
  • An adaptive excitation inrush current suppression device and method
  • An adaptive excitation inrush current suppression device and method

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Embodiment Construction

[0080] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0081] Such as figure 1 with figure 2 As shown, an adaptive excitation inrush suppression device includes an analog acquisition module (AC module), a main control module (main control module), a communication module (communication module), and an input module ( Input module), output module (output module) and human-computer interaction module (HMI module), the main control module is connected with analog acquisition module, input module, output module, communication The modules are connected, the communication module is connected with the human-computer interaction module; there are several analog quantity acquisition modules (AC modules).

[0082] The analog acquisition module is used to collect secondary signals of AC voltage and current, and transmit the collected data to the main control module;

[0083] The input module is us...

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Abstract

A magnetizing inrush current restraining method and device. According to the method, the state of a transformer before no-load closing is considered comprehensively, and different control strategies are adopted according to different states; during local manual opening or distant remote-control opening, an angle identical to an opening phase angle is selected for closing; during tripping caused by short-circuit faults, magnetizing inrush currents at the moments of different closing phase angles in the range of 0-360 degrees are estimated according to three-phase voltage information at the moment of opening to obtain a closing phase angle corresponding to the minimum magnetizing inrush current; and during man-made demagnetization after opening, the angle of any of three phases is selected as 90 degrees for closing. The method and the device have the capability of automatically recognizing the state of the transformer before no-load closing and executing the corresponding control strategy and the capability of automatically learning the time needed by switch closing and automatically adjusting closing exit triggering moments; the device also has a complete set of functions for protecting electric quantity of the transformer.

Description

technical field [0001] The invention relates to the technical field of power system automation, in particular to an adaptive excitation inrush suppression device and method. Background technique [0002] The power transformer is an extremely important electrical equipment in the power system, and its safe operation is directly related to whether the power system can work continuously and stably. When the transformer is in steady state operation, the excitation current of the transformer is only 1% to 10% of the rated current. However, when the transformer is switched on without load, due to the saturation of the transformer iron core flux, the existence of residual magnetic flux and the non-linear characteristics of the iron core material, an exciting inrush current with a relatively large amplitude will be generated, and it will stabilize after several cycles of transient process. State, the impact of closing current can often reach 6 to 8 times the rated current. In addi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P13/00H02H7/04
CPCH02H7/04H02P13/00
Inventor 王树刚陆钟华李培培胡兵陈福锋王琦陆圣芝滕俊
Owner YANGZHOU POWER SUPPLY CO OF STATE GRID JIANGSU ELECTRIC POWER CO
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