Self-adaptive magnetizing inrush current restraining device and method thereof

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: 2015-02-18
YANGZHOU POWER SUPPLY CO OF STATE GRID JIANGSU ELECTRIC POWER CO +3
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Self-adaptive magnetizing inrush current restraining device and method thereof
  • Self-adaptive magnetizing inrush current restraining device and method thereof
  • Self-adaptive magnetizing inrush current restraining device and method thereof

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Embodiment Construction

[0078] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0079] Such as figure 1 and figure 2 As shown, an adaptive excitation inrush suppression device includes an analog quantity acquisition module (AC module), a main control module (main control module), a communication module (communication module), and an input module (opening module ), output module (output module) and human-computer interaction module (HMI module). The modules are connected; there are several analog quantity acquisition modules (AC modules).

[0080] The analog quantity acquisition module is used to acquire secondary signals of AC voltage and current, and transmit the acquired data to the main control module;

[0081] The input module is used to collect the switch position and the switch input signal of the function pressure plate, and perform internal data interaction with the main control module through the SPI...

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Abstract

The invention discloses a self-adaptive magnetizing inrush current restraining device and a method thereof. 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 acquire a closing phase angle corresponding to the minimum magnetizing inrush current; during man-made demagnetization after opening, the angle of any one of three phases is selected as 90 degrees. The magnetizing inrush current restraining device produced according to the method has the advantages of capability of automatically recognizing the state of the transformer before no-load closing and executing the corresponding control strategy, capability of automatically learning time needed by switch closing and automatically adjusting closing exit triggering moments and function of protecting the whole 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 Applications(China)
IPC IPC(8): H02P13/00H02H7/04
CPCH02H7/04H02P13/00
Inventor 王树刚陆钟华王琦陆圣芝胡兵陈福锋
Owner YANGZHOU POWER SUPPLY CO OF STATE GRID JIANGSU ELECTRIC POWER CO
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