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A K-factor Transformer Equivalent Load Conversion Method

A technology of equivalent load and K factor, which is applied in the field of transformers, can solve the problems that the test method needs to be corrected, etc.

Active Publication Date: 2021-12-14
DONGGUAN DAZHONG ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0029] Therefore, existing test methods need to be revised

Method used

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  • A K-factor Transformer Equivalent Load Conversion Method
  • A K-factor Transformer Equivalent Load Conversion Method
  • A K-factor Transformer Equivalent Load Conversion Method

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Embodiment Construction

[0051] The present invention is further described in conjunction with the following examples.

[0052] Depend on figure 1 Know; A kind of K coefficient transformer equivalent load conversion method described in the present embodiment, comprises the following steps:

[0053] Step A: Measure the DC resistance R of the winding of the transformer product at room temperature DC , and then calculate the DC resistance loss P DC ;

[0054] Step B: Measured at frequency f 1 and the respective load losses P1 and Px of the products at frequency fx, and decompose the winding eddy current loss Pwe1 and the stray loss of structural parts Pse1;

[0055] Step C: Calculate the total eddy current loss Pwe of the winding under harmonics according to the K value and the eddy current loss Pwe1;

[0056] Step D: According to the DC resistance loss P DC , The total eddy current loss Pwe of the winding is calculated to obtain the overload current multiple I when the rated harmonic load is equiv...

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Abstract

The present invention relates to the technical field of transformers, in particular to a K-factor transformer equivalent load conversion method, comprising the following steps: Step A: Measure the DC resistance R of the winding of the transformer product at normal temperature DC , and then calculate the DC resistance loss P DC ;Step B: Measured at frequency f 1 The load loss P1 and Px of the products under the frequency fx, and the eddy current loss Pwe1 of the winding and the stray loss Pse1 of the structural parts are decomposed; Step C: Calculate the total eddy current loss Pwe of the winding according to the K value and the eddy current loss Pwe1; Step D: Calculate the overload Current multiple I N ; Step E: Simulate and measure the winding equivalent temperature rise of the measured product under the corresponding K-factor harmonic. Compared with the UL1561 standard, the present invention defines a K-factor transformer equivalent load test method more reasonably, and avoids mixing the stray loss Pse in the structural parts of the product into the winding, causing the equivalent loss of the product to be falsely high and being tested in transition The phenomenon.

Description

technical field [0001] The invention relates to the technical field of transformers, in particular to a K-factor transformer equivalent load conversion method. Background technique [0002] At present, with the rapid development of power electronics technology, more and more nonlinear loads are applied to various fields. Due to its nonlinear characteristics, the electromagnetic compatibility performance of the equipment is reduced, the grid-side input current is severely distorted, and a large number of harmonics are generated and released to the grid or front-end equipment, which brings harm to the grid and other electrical equipment. Various harmonic voltages or nonlinear loads existing in the power grid will generate additional harmonic losses in the transformer coils at the front end. When these harmonic losses are large enough, the temperature of the transformer will rise, and even exceed its allowable operation The temperature not only reduces the service life of the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/00
CPCG01R31/00
Inventor 冉瑞刚李正中李经伟
Owner DONGGUAN DAZHONG ELECTRONICS