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Test of adopting random waveform power supply to measure voltage current characteristics of mutual inductor and calculation method

A technology of arbitrary waveform and volt-ampere characteristics, which is applied in the field of volt-ampere characteristics test of transformers, which can solve the problems of difficult research and development of sine wave power supply, large frequency variation range, and difference in test results.

Active Publication Date: 2012-08-01
云南电力试验研究院(集团)有限公司
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Problems solved by technology

However, there are two problems with this method: ① It is difficult to develop a sine wave power supply with a large frequency range and large output capacity, and the cost is high. ② The model of the transformer has been simplified, and the inherent nonlinearity of the iron core Characteristics are not fully considered, leading to discrepancies in test results

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  • Test of adopting random waveform power supply to measure voltage current characteristics of mutual inductor and calculation method
  • Test of adopting random waveform power supply to measure voltage current characteristics of mutual inductor and calculation method
  • Test of adopting random waveform power supply to measure voltage current characteristics of mutual inductor and calculation method

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Embodiment Construction

[0046] Below with the accompanying drawings figure 1 , figure 2 , image 3 The present invention is further described.

[0047] (1) if figure 1 ,according to figure 1 Establish the equivalent circuit of transformer volt-ampere characteristic test. The circuit consists of the main inductor L m , Eddy current loss resistance R e , the hysteresis loss resistor R h The parallel impedance of the secondary winding DC resistance R ct connected in series, u(t) is the terminal voltage applied to the secondary winding during the test, e(t) is the induced potential of the secondary winding, P is the active power, P T is the core loss; i e (t) is the equivalent current of eddy current loss, i h (t) is the equivalent current of hysteresis loss, i m (t) is the flow through R h and L m The current of the parallel branch consisting of, i ex (t) is the excitation current;

[0048] (2) Measure the DC resistance R of the secondary winding ct ;

[0049] (3) Using an arbitrary wa...

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Abstract

Provided are a test of adopting a random waveform power supply to measure voltage current characteristics of a mutual inductor and a calculation method. An accurate equivalent circuit of the mutual inductor is established, the method of adopting the random waveform power supply for testing the mutual inductor is put forward, and a group of calculation formula is deduced. The calculation method is suitable for tests of voltage current characteristic for electrical equipment with iron cores and coil structures such as a transformer, an electric reactor, a mutual inductor and the like, especially suitable for tests for a mutual inductor. By adopting the equivalent circuit, the test method and the calculation formula, various parameters of the mutual inductor such as hysteresis loss resistance, fundamental magnetization curve and core magnetization loop cluster can be measured with simple methods. By means of the parameters, test data of any frequency can be used for calculating test results of power frequency, calculation results and actual tested results of power frequency have good consistency, and the calculation method has the advantages of being simple, fast, convenient and safe in test.

Description

technical field [0001] The invention relates to the volt-ampere characteristic (or excitation characteristic) test of transformers, reactors and transformers for electric power, and is especially suitable for the volt-ampere characteristic test of transformers. technical background [0002] The performance of the transformer has an impact on the metering, monitoring, relay protection, wave recording, and distance measurement of the power system. The volt-ampere characteristic test is an important means to detect the transformer. Generally, the power frequency sine wave power supply is used in the secondary transformer. The method of applying voltage to the secondary winding is tested. With the development of ultra-high voltage and ultra-high voltage transmission technology and the wide application of large-capacity generator sets, the metering system, monitoring system, and relay protection system of power plants and substations have put forward higher requirements for the p...

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Application Information

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IPC IPC(8): G01R31/00
Inventor 梁仕斌刘涛王磊钟尧王任陈勇
Owner 云南电力试验研究院(集团)有限公司
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