Test method and compensation calculation method for measuring voltage-current characteristic of ferromagnetic element by low-frequency variable-frequency power source
A technology of ferromagnetic components and variable frequency power supply, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., it can solve the problems of non-linear relationship, the influence of winding direct resistance on the measurement results of volt-ampere characteristics, etc., to eliminate the influence. Effect
Active Publication Date: 2011-06-15
云南电力试验研究院(集团)有限公司
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[0013] Purely inductive main reactance value X Lm =ωL m It has a linear relationship with the frequency, but the equivalent resistance of the iron loss (including eddy current loss and hysteresis loss) of the ferromagnetic element is not linear with the frequency. The equivalent resistive current of the iron loss and the inductive current I passing through the main reactance m The phase difference is 90 degrees; in addition, the excitation impedance drops significantly at low frequencies, and the direct resistance of the winding has a greater influence on the measurement results of the volt-ampere characteristics
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[0068] The invention is a test method and a compensation calculation method for measuring the volt-ampere characteristics of ferromagnetic components by using a low-frequency variable-frequency power supply.
[0069] The characteristics of this method are:
[0070] (1) A mathematical model for measuring the volt-ampere characteristics of ferromagnetic components with a low-frequency power supply is established. This model expresses the electromagnetic relationship of ferromagnetic components with a circuit, which is composed of the main inductive reactance jωL of the iron core m , Iron core eddy current loss equivalent resistance R E , Iron core hysteresis loss equivalent resistance R H The parallel impedance and winding DC resistance R ct Composition in series; I E is the equivalent current of the core eddy current loss, I H is the equivalent current of the core hysteresis loss, I m is the inductive current through the main inductive reactance, U is the terminal voltage ...
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The invention relates to a test method and a compensation calculation method for measuring voltage-current characteristics of a ferromagnetic element by a low-frequency variable-frequency power source. In the methods, deep analysis is carried out on an equivalent model of a ferromagnetic element, a variable-frequency power source is adopted to carry out a test, loss power P, voltage U, exciting current Iex and winding direct-current resistance Rct under low frequency are measured, and a set of compensation calculation formulas are deduced in order to compensate the influences on iron loss anddirect-current resistance, thereby enabling low-frequency test data after compensation calculation to have good consistency with a power-frequency actual measurement result. The invention can greatlylower the test voltage and the capability of a required test facility, makes up the insufficiencies of the power-frequency test and can effectively eliminate the influences on factors, such as the iron core loss, the winding direct-current resistance and the like.
Description
Technical field: [0001] The invention belongs to the technical field of electrical testing of power equipment, and is suitable for performing volt-ampere characteristics (or excitation characteristics) tests on ferromagnetic elements with iron core and coil structures such as power transformers, reactors and transformers. technical background: [0002] Transformers, reactors, transformers and other ferromagnetic components with core and coil structures need to be tested for parameters such as core performance, no-load voltage, excitation current, and excitation curve linearity during design, delivery, and use to ensure The actual performance of ferromagnetic components meets the requirements. As an effective method for measuring the above parameters, the volt-ampere characteristic test is widely adopted by manufacturers and component users. In the prior art, a power frequency power supply is usually used for the volt-ampere characteristic test. With the needs of practical a...
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IPC IPC(8): G01R31/00
Inventor 梁仕斌
Owner 云南电力试验研究院(集团)有限公司