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Method and apparatus for suppressing an inrush current of a transformer

A technology of transformers and three-phase transformers, which is applied in the direction of emergency protection circuit devices, electrical components, circuit devices, etc. for limiting overcurrent/overvoltage, and can solve problems such as misoperation, increased motor vibration, and aging

Inactive Publication Date: 2012-12-19
SIEMENS AG
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Inrush current can also have a very large impact on the power system and peripheral equipment, such as harmonics that cause electrical resonance to the power system, voltage drops in the power supply that cause misoperation of sensitive electronic equipment, and DC components that increase motor vibration and aging

Method used

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  • Method and apparatus for suppressing an inrush current of a transformer
  • Method and apparatus for suppressing an inrush current of a transformer
  • Method and apparatus for suppressing an inrush current of a transformer

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Embodiment Construction

[0021] Various embodiments are described with reference to the drawings, wherein like reference numerals are used to refer to like parts throughout the specification. In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of one or more embodiments. It is evident that the embodiments may be practiced without these specific details.

[0022] figure 1 is an exemplary apparatus 10 according to an embodiment herein for suppressing an energizing inrush current in a transformer 15 in a three-phase power system. The device 10 includes a circuit breaker 20 , one or more monitoring units 22 and a controller 35 . Typically, circuit breaker 20 is a three-pole circuit breaker. The three-pole circuit breaker may be a dependent pole circuit breaker or an independent pole circuit breaker. Typically, dependent pole circuit breakers are used for low and medium voltage power systems, and independent pol...

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PUM

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Abstract

The invention relates to a method and an apparatus for suppressing an inrush current of a three-phase transformer (15) connected to a three-phase power supply via a triple- pole circuit breaker (20), the transformer (15) being connected and disconnected from the power supply by closing and opening the circuit breaker (20), wherein the method comprises monitoring a property of at least two phases of the transformer (15), determining a residual flux pattern after the circuit breaker (20) is opened, computing an equivalent opening moment (60) of the circuit breaker (20) using the property monitored, wherein at the equivalent opening moment (60) of the circuit breaker (20), the phases of the transformer (15) are de-energized simultaneously, deriving a closing time window (64) for closing the circuit breaker (20) on the basis of the equivalent opening moment (60), and closing the poles of the circuit breaker (20) simultaneously within the closing time window (64).

Description

technical field [0001] The present invention relates to a method and device for suppressing inrush current of a three-phase transformer connected to a three-phase power supply through a three-phase circuit breaker. Background technique [0002] Circuit breakers are commonly used to separate transformers and power sources within the grid. By opening its poles, the circuit breaker separates the transformer from the power supply. Cut off power to the transformer, which is isolated from the power supply. On a de-energized transformer, the current becomes zero and the phase flux or phase flux follows the hysteresis loop of the transformer core, leaving only some residual flux at the core at zero current. In general, remanent flux is the magnetic flux density in a material when the magnetizing force is zero. Residual flux may typically be approximately 20% to 70% of rated flux. In some aspects, the residual flux can be as high as 80% to 90% of the rated flux. Connecting a tra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/02
CPCH02H9/002H02H7/04
Inventor 李明施俊于尔恩里克·加克西奥拉格尔德·格里彭特罗格
Owner SIEMENS AG
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