Method for quantitatively evaluating oil-paper insulation ageing by time domain sub-spectrum line response factor characteristic value
A technology of oil-paper insulation and response factor, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problems of staying at the qualitative evaluation level and lack of quantitative evaluation methods, and achieve the effect of reliable and powerful evaluation means
Inactive Publication Date: 2019-01-18
FUZHOU UNIVERSITY
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[0002] At present, the extended Debye equivalent circuit analysis is usually used to evaluate the oil-paper insulation state of transformers. Some research results have been achieved, but there are still some problems: 1) Although some evaluation methods have been proposed in the aspect of oil-paper insulation aging judgment, most methods only 2) Most researchers have also proposed the method of evaluating the aging status of oil-paper insulated transformers by using relaxation response characteristic quantities, but it can only diagnose the overall insulation status of oil-paper insulated transformers, and cannot It is specifically diagnosed whether the aging of the insulating oil or the insulating paper
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Embodiment 1
[0069] There are 3 oil-paper insulated transformers (D1, D2, D3), and the basic conditions of known transformer oil-paper insulation are shown in Table 1. Use the RVM5461 recovery voltage tester to perform the recovery voltage test respectively, and obtain the recovery voltage polarization spectrum curves of D1, D2, and D3 transformers as follows: Figure 1-3 shown. Based on the recovery voltage polarization spectrum curve, the method of the present invention is applied to evaluate the oil-paper insulation state of three transformers. With implementation steps as follows:
[0070] Table 1 Basic Information of Transformer
[0071]
[0072] According to step S1 to step S3. Differential decomposition spectrum is carried out to the recovery voltage polarization spectrum curve of 3 transformer tests, its result is as follows Figure 4-Figure 6 shown.
[0073] Calculate the average relaxation factor β of the insulating oil of the three transformers according to step S4. 油 an...
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The invention relates to a method for quantitatively evaluating oil-paper insulation ageing by a time domain sub-spectrum line response factor characteristic value. The method comprises the steps of applying a medium response function with a relaxation factor into analysis of a return voltage time domain dielectric spectrum; performing differential spectrum unfolding on a return voltage time domain response spectrum line to obtain sub-spectrum lines including different relaxation information, and respectively extracting new characteristic quantities such as average relaxation factors of insulation oil and insulation paper and then exploring a mutual relation between the insulation oil performance deterioration and insulation paper ageing of the relaxation factor and the oil-paper insulation transformer. The invention further provides a new method for quantitatively evaluating the performance of insulating oil of the oil-paper insulating transformer and an insulating state of the insulating paper. With the method for quantitatively evaluating the oil-paper insulation ageing by the time domain sub-spectrum line response factor characteristic value, the diagnosis for the state of an oil-paper insulation system of a single transformer can be effectively implemented and a reliable and powerful evaluation means is provided for engineering application.
Description
technical field [0001] The invention relates to a method for quantitatively evaluating aging of oil-paper insulation by eigenvalues of sub-spectral line response factors in time domain. Background technique [0002] At present, the extended Debye equivalent circuit analysis is usually used to evaluate the oil-paper insulation state of transformers. Some research results have been achieved, but there are still some problems: 1) Although some evaluation methods have been proposed in the aspect of oil-paper insulation aging judgment, most methods only 2) Most researchers have also proposed the method of evaluating the aging status of oil-paper insulated transformers by using relaxation response characteristic quantities, but it can only diagnose the overall insulation status of oil-paper insulated transformers, and cannot Specifically, it is diagnosed which one of the insulating oil or the insulating paper is aging. Accordingly, the present invention proposes a new method fo...
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CPCG01R31/1263
Inventor 蔡金锭林晓宁叶荣
Owner FUZHOU UNIVERSITY