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Transformation ratio quick calculation method for special transformer in unbalanced state

A special transformer and balanced state technology, applied in the field of power transmission and transformation, can solve the problems of high cost, inability to guarantee the accuracy of approximate values, and slow testing process

Active Publication Date: 2017-10-20
保定丰源电子科技有限公司
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  • Application Information

AI Technical Summary

Problems solved by technology

The instrument is characterized by high cost and can automatically determine the transformer group, but the test process is slow, and the test results are approximate and the accuracy cannot be guaranteed
[0006] At present, there is still a lot of room for improvement in domestic transformer ratio testers

Method used

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  • Transformation ratio quick calculation method for special transformer in unbalanced state
  • Transformation ratio quick calculation method for special transformer in unbalanced state
  • Transformation ratio quick calculation method for special transformer in unbalanced state

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Embodiment Construction

[0030] A method for quickly calculating the transformation ratio of a special transformer in an unbalanced state, comprising the following steps:

[0031] A. Use the built-in three-phase power supply to output the three-phase voltage signal and apply it to the primary side of the transformer;

[0032] B. Obtain the transfer function between any two-phase voltage signals on the primary side;

[0033] C. Decompose all three transfer functions in the frequency domain;

[0034] D. Select the transfer function components located in the same eigenfrequency segment to extract the eigenvectors, and merge the eigenvectors belonging to different transfer functions;

[0035] E. Use the eigenvectors to form the eigenmatrix, and obtain the eigenvalues ​​of the eigenmatrix;

[0036] F, collect the voltage signal on the secondary side of the transformer, and obtain the eigenvalue of the characteristic matrix characteristic of the voltage signal on the secondary side of the transformer acco...

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Abstract

The invention discloses a transformation ratio quick calculation method for a special transformer in unbalanced state. The method comprises the following steps of A, outputting a three-phase voltage signal by means of a built-in three-phase power supply and applying the voltage signal to the primary side of the transformer; B, calculating a transmission function between two random phase voltage signals at the primary side; C, performing frequency domain decomposition on total three transmission functions; D, selecting transmission function components at the same characteristic frequency segment for performing characteristic vector extraction, and combining the characteristic vectors which belong to different transmission functions; E, forming a characteristic matrix by means of the characteristic vectors, and calculating a characteristic value of the characteristic matrix; F, acquiring a voltage signal at the secondary side of the transformer, and calculating the characteristic value of a voltage signal characteristic matrix at the secondary side of the transformer according to the steps B-E; and G, correcting the voltage signals at the secondary side, and performing calculation for obtaining the transformation ratio of the transformer. The transformation ratio quick calculation method can settle defects in prior art and overcomes a detection error caused by unbalance of a three-phase power supply.

Description

technical field [0001] The invention relates to the technical field of power transmission and transformation, in particular to a method for quickly calculating the transformation ratio of a special transformer in an unbalanced state. Background technique [0002] The transformer is an important equipment in the power transmission and transformation system, and the reliability of its operation is very important. The transformation ratio of the transformer is an important indicator to reflect whether the transformer is operating normally. When the transformers are running in parallel, the difference in the transformation ratio will cause the transformer itself to generate a circulating current, which will cause the transformer to overheat or even burn out. Therefore, the transformation ratio test of the transformer is an important content. However, with the development of technology and the increase of transformer types, the detection speed of the traditional transformer ratio...

Claims

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Application Information

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IPC IPC(8): G01R31/02G01R19/00
CPCG01R19/0084G01R31/62
Inventor 王旭光朱秉权王世民
Owner 保定丰源电子科技有限公司
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