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Restrain device and control method for excitation inrush current of transformer

一种突入电流、抑制装置的技术，应用在电路装置、高压/大电流开关、紧急保护电路装置等方向，能够解决无法正确地计算残留磁通等问题，达到抑制励磁突入电流的效果

Active Publication Date: 2009-12-23
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is, when calculating the magnetic flux by integrating the terminal voltage 4 to 6 of the transformer, the residual magnetic flux cannot be calculated correctly

Method used

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  • Restrain device and control method for excitation inrush current of transformer
  • Restrain device and control method for excitation inrush current of transformer
  • Restrain device and control method for excitation inrush current of transformer

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Experimental program
Comparison scheme
Effect test

no. 1 approach

[0098] Next, the following reference Figure 1 to Figure 5 , the configuration and operational effects of the excitation inrush current suppressing device for a transformer according to the first embodiment will be described. in addition, figure 1 It is a block diagram showing the connection relationship between a three-phase transformer, a three-phase circuit breaker, and a connection control device that issues a connection command to the main contacts of each circuit breaker, figure 2 It is a waveform diagram showing the relationship between the pole-to-pole voltage, the power supply phase voltage, the line-to-line voltage, the stable magnetic flux between the lines, and the residual magnetic flux of the circuit breaker used to turn on the transformer.

[0099] in addition, image 3 It is a diagram showing the phenomenon that DC voltage is generated in the primary terminal voltage when the non-effectively grounded system transformer is cut off. Figure 4 It is to connect...

no. 2 approach

[0136] Next, the following reference Figure 6 The excitation inrush current suppression device for a transformer according to the second embodiment will be described. in addition, Figure 6 is in figure 2 In the waveform diagram of , the timing at which the circuit breaker 200 is turned on has been changed.

[0137] (2.1. Structure)

[0138] In the second embodiment, since the connection relationship of the three-phase transformer 300, the three-phase circuit breaker 200, and the connection control device 600 is the same as that of the first embodiment described above, it is similar to the first embodiment described above except for the following points. structure is common.

[0139] In the second embodiment, the connection control device 600 is set so that the line with the largest residual magnetic flux among the lines of the three-phase transformer 300 is used as the line where the stable magnetic flux and the residual magnetic flux have the same polarity and magnitud...

no. 3 approach

[0160] Next, the following reference Figure 8 A field inrush current suppression device for a transformer according to a third embodiment will be described. in addition, Figure 8 Shows the phase relationship between the primary Y-side phase voltage and the line-to-line voltage, and the secondary or tertiary Δ-side voltage to ground and the line-to-line voltage.

[0161] (3.1. Structure)

[0162] In the third embodiment, since the connection relationship of the three-phase transformer 300, the three-phase circuit breaker 200, and the connection control device 600 is the same as that of the above-mentioned first embodiment, it is similar to the above-mentioned first embodiment except for the following points. The structure is common.

[0163] In the third embodiment, even if the voltage dividing device is not provided on the primary Y side of the transformer, and the transformer terminal voltage measurement unit 603 cannot measure the transformer terminal voltage on the pri...

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Abstract

The present invention provides a restrain device and a control method for an excitation inrush current of a transformer, capable of calculating a residual magnetic flux of the transformer when cutting off by a circuit breaker in a non-effective ground system correctly, and restraining the excitation inrush current generated when switching on a three-phase transformer by using three monophasictype circuit breakers, thus the circuit breaker with additional electric resistance bodies will not be large. The device is provided with a stable magnetic flux calculation unit for calculating the stable magnetic flux between lines of a three-phase power supply; a residual magnetic flux calculation unit for calculating the residual magnetic flux between primary lateral lines of the transformer when cutting off the transformer by the circuit breaker; and a phase detection unit for detecting the polarity of the calculated stable magnetic flux and the calculated residual magnetic flux between identical lines, as well as phase with consistent size, a switching-on control unit switches on the two-phase circuit breaker connecting the lines according to the phase detected by the phase detection unit, then switching on the residual one-phase circuit breaker.

Description

technical field [0001] The present invention relates to a technique for suppressing the excitation inrush current generated when the transformer is turned on, and particularly relates to the excitation inrush of a transformer that can accurately calculate the residual magnetic flux and suppress the excitation inrush current without adding devices such as circuit breakers with resistors. Current suppression device and control method thereof. Background technique [0002] In the state where residual magnetic flux exists in the iron core of the transformer, when the transformer is powered on to perform no-load excitation, an excessive excitation inrush current may flow, and the magnitude of the excitation inrush current generally reaches the rated load of the transformer. several times the current. Therefore, the system voltage fluctuates due to the flow of the field inrush current, and when the voltage fluctuation is large, there is a possibility of affecting consumers. [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/02H01H33/70
CPCH02H9/002
Inventor 腰冢正斋藤实二神浩一楠山宏佐藤纯正
Owner KK TOSHIBA
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