Ferromagnetic element no-load characteristic low-frequency measuring method

A technology of no-load characteristics and ferromagnetic components, which is applied in the field of ferromagnetic components, can solve the problems of operators’ personal safety not being guaranteed, complex no-load test procedures, large capacity, volume and weight of test equipment, etc.

Active Publication Date: 2016-12-21
云南电力试验研究院(集团)有限公司 +2
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Problems solved by technology

However, with the increase of the voltage level of the power grid, the voltage level and capacity of ferromagnetic components such as transformers are also gradually increasing. The capacity, volume and weight of the test equipment required for the no-load test are often large, resulting in complex no-load test procedures. The personal safety of operators cannot be guaranteed

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Embodiment Construction

[0048] Embodiments of the present invention provide a low-frequency measurement method for the no-load characteristics of ferromagnetic elements. In order to enable those skilled in the art to better understand the technical solutions in the present invention, the following will describe the embodiments of the present invention in conjunction with the accompanying drawings and specific implementation methods. Clearly and completely describe the technical solutions, obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0049] The measurement process is as follows:

[0050] see Figure 4 , is a schematic diagram of the measurement method of the present invention.

[0051] Step 100: Ac...

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Abstract

A ferromagnetic element no-load characteristic low-frequency measuring method mainly comprises the following steps: 1) establishing a high-voltage side open-circuit equivalent circuit according to a T-type equivalent circuit, applying two low-frequency sine waves having different frequencies at the low-voltage side, and calculating iron-core loss under each frequency; 2) calculating unit hysteresis and eddy-current loss We and Wh produced in each period, and calculating iron core loss PCoren when converted to the power frequency; 3) calculating exciting current Iexn, harmonic content K(k) and exciting voltage Un when converted to the power frequency according to an eddy current compensation algorithm; 4) calculating no-load loss Pn; and 5) drawing PCoren-Un, Iexn-Un relation curves and a K(k)-Un harmonic content table. The test is carried out by adopting low-frequency power to replace power frequency power, so that test power source capacity can be reduced by times, the size and weight of the test device are reduced, and the test cost is allowed to be lower.

Description

technical field [0001] The invention belongs to the technical field of measurement of no-load characteristics of ferromagnetic components, mainly includes measurement of no-load loss, excitation characteristics, and harmonic content of no-load current, and specifically relates to ferromagnetic components such as transformers, transformers, and reactors. Background technique [0002] Ferromagnetic components such as transformers, transformers, and reactors are the most important power transmission and transformation equipment in the power system, and their performance directly affects the safe and economical operation of the power system. The no-load loss, excitation characteristics and no-load current harmonic content of ferromagnetic components are important indicators to reflect the core performance of ferromagnetic components. "GB1094.1-2013 Power Transformer Part I: General Rules" requires no-load loss and no-load current measurement as a routine test, which can be used ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00G01R33/12
CPCG01R31/00G01R33/12G01R33/123
Inventor 刘鑫梁仕斌姚陈果刘涛王磊田庆生
Owner 云南电力试验研究院(集团)有限公司
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