Method for testing influence of temperatures on frequency-domain dielectric spectra
A technology of frequency-domain dielectric spectrum and test method, which is applied in the test field of influence to achieve the effect of improving accuracy and accurate data test
Inactive Publication Date: 2019-03-22
GUANGXI POWER GRID ELECTRIC POWER RES INST
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[0004] The object of the present invention is to provide a kind of test method of the influence of temperature on the frequency domain dielectric spectrum, thereby overcome the shortcoming of the existing test method that does not have the influence of temperature on the frequency domain dielectric spectrum
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Embodiment 1
[0026] A test method for the influence of temperature on the frequency domain dielectric spectrum comprises the following steps:
[0027] S1. Select 5 oil-paper insulation samples with different aging times and the same moisture content and 5 oil-paper insulation samples with the same aging time and different moisture contents; use the oil-paper insulation samples for the test instead of directly using the oil-paper insulation of the transformer. It is convenient for experimenters to study the temperature on the frequency domain dielectric spectrum of oil-paper insulation;
[0028] S2. Seal 10 oil-paper insulation samples respectively, and place them in the incubator for 24 hours after sealing, until the moisture in the insulating oil and the insulating cardboard reaches equilibrium;
[0029] S3. Determine that the maximum temperature to be tested is 90°C, and set the maximum temperature to 90°C;
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The invention discloses a method for testing influence of temperatures on frequency-domain dielectric spectra, and relates to the field of detection of insulation states of oil paper for transformers.The method includes steps of S1, selecting a plurality of oil paper insulation samples; S2, sealing the multiple oil paper insulation samples and then placing the oil paper insulation samples in constant-temperature tanks to carry out still standing; S3, determining the maximum to-be-tested temperatures and setting the maximum to-be-tested temperatures as initial temperatures; S4, setting the temperatures of the multiple constant-temperature tanks as the initial temperatures, carry outing out sealing and still standing, and then testing the frequency-domain dielectric spectra of the multipleoil paper insulation samples; S5, lowering the temperatures of the multiple constant-temperature tanks by set temperature difference after measurement is accomplished at the step S4, then carrying outsealing and still standing, and then testing the frequency-domain dielectric spectra of the oil paper insulation samples in the multiple constant-temperature tanks at the lowered temperatures; S6, repeatedly carrying out the step S4, and stopping tests when the lowered temperatures are lower than the room temperature. The method has the advantages that temperature lowering procedures can be regularly simulated and tested by the aid of the method, and data of the frequency-domain dielectric spectra of the oil paper insulation samples are favorable for follow-up research.
Description
technical field [0001] The invention relates to the field of transformer oil paper insulation state detection, in particular to a method for testing the influence of temperature on frequency-domain dielectric spectrum. Background technique [0002] "Impact of temperature on the frequency domain dielectric spectroscopy for the diagnosis of power transformer insulation" and "Effects of moisture and temperature on the frequency domain spectroscopy analysis of power transformer insulation" show that by testing the frequency domain dielectric spectrum of oil-paper insulation samples at different temperatures , it is found that with the increase of temperature, both the real part and the imaginary part of the complex capacitance in the low frequency range of the tested sample increase significantly; Moving, there is an exponential relationship between crossover frequency and temperature. The study "Frequency response of oil impregnated pressboard and paper samples forestimating m...
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Login to view more IPC IPC(8): G01R31/12G01R31/16
CPCG01R31/1263G01R31/16
Inventor 邬蓉蓉张炜余长厅颜海俊张玉波
Owner GUANGXI POWER GRID ELECTRIC POWER RES INST
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