Duality-principle-equivalent-model-based residual flux measuring method for iron cores and yokes of three-phase three-core-limb transformer

A transformer core and dual principle technology, applied in the field of transformer residual magnetic flux measurement, can solve problems such as insufficient attention, and achieve the effect of portable test equipment, safe test process and high efficiency

Active Publication Date: 2016-03-30
云南电力试验研究院(集团)有限公司 +3
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  • Application Information

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Problems solved by technology

At present, the research on the residual magnetism of the transformer core and iron yoke is not paid enough attention. Some related regulations and standards often ignore the influence of residual magnetic flux on the performance of ferromagnetic components. Therefore, the mechanism of residual magnetic flux and its existence law are studied, and then It is very important to take corresponding measures to eliminate

Method used

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  • Duality-principle-equivalent-model-based residual flux measuring method for iron cores and yokes of three-phase three-core-limb transformer
  • Duality-principle-equivalent-model-based residual flux measuring method for iron cores and yokes of three-phase three-core-limb transformer

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Embodiment Construction

[0017] How to implement the present invention is further set forth below in conjunction with accompanying drawing: see figure 1 , figure 2 ,

[0018] 1) The transformer in this case is a △-Y connection, and the winding on the high voltage side of the transformer is open circuited, and the square wave power supply with an output amplitude of ±5V with adjustable pulse width is output to the low voltage winding of the three-phase three-iron core column under test for phase a and b For excitation, connect the r=1Ω resistor in series between the a-phase low-voltage winding of the transformer and the pulse width adjustable square wave power supply, connect U r Connect to CH6 channel of multi-channel digital oscilloscope, low-voltage side winding U ac , U ba , U bc Connect to multi-channel digital oscilloscope CH1, CH2 and CH3 channels, set U AC , U BC Access to multi-channel digital oscilloscope CH4, CH5 channel;

[0019] 2) During the test, the pulse width adjustable square...

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Abstract

The invention provides a duality-principle-equivalent-model-based residual flux measuring method for iron cores and yokes of a three-phase three-core-limb transformer. The measuring method comprises the steps: considering eddy-current loss resistance and inductance and zero sequence magnetic flux eddy current equivalent resistance and inductance for iron cores and yokes of a three-phase three-core-limb transformer; establishing a transient analysis model based on a duality principle for the three-phase three-core-limb transformer; applying width-controllable pulse voltage to any two phases at a winding of the low voltage side of the transformer; utilizing a multichannel oscilloscope to acquire voltage signals at different positions of the transformer; and performing integration operation processing to obtain residual flux values of the three core limbs and the upper and lower yokes. The duality-principle-equivalent-model-based residual flux measuring method for iron cores and yokes of a three-phase three-core-limb transformer can accurately measure the most original residual flux in the iron cores and yokes of the three-phase three-core-limb transformer, and has the advantages of being light in test equipment, being safe in the test process and being high in efficiency. After the residual flux test for the first time, the residual flux changes so that measurement through the measuring method again has no reproducibility.

Description

technical field [0001] The invention relates to the measurement of the residual magnetic flux of the ferromagnetic element of the three-phase three-iron core column in the power system, and is especially suitable for the measurement of the residual magnetic flux of the transformer. technical background [0002] Ferromagnetic components like transformers, transformers, and reactors are important equipment in power systems and play an important role in fault diagnosis and protection of power systems. When the transformer is subjected to faults such as short-circuit impact, or after performing voltage ratio, DC resistance measurement and no-load experiments on the transformer, residual magnetism will remain in the iron core. Due to the existence of residual magnetism, when the transformer is put into operation, the residual magnetism of the iron core will saturate the transformer iron core for half a cycle, resulting in an excitation inrush current several times or even ten tim...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/12
CPCG01R33/12
Inventor 刘涛梁仕斌刘鑫彭庆军王磊田庆生杨殿成
Owner 云南电力试验研究院(集团)有限公司
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