A vegetable oil paper insulation state evaluation method based on a fractional Zener model

A state evaluation and vegetable oil technology, applied in the direction of complex mathematical operations, etc., can solve the problem that the low frequency band of the fractional Maxwell is not fitted, and achieve the effects of reliable aging state, reduced error of reconstructed frequency curve, and accurate evaluation

Active Publication Date: 2019-04-23
CHINA THREE GORGES UNIV
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Problems solved by technology

However, when describing the dielectric storage and dielectric loss at the same time, it was found that the fractional Maxwell low-frequency band did not get a corresponding fit

Method used

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  • A vegetable oil paper insulation state evaluation method based on a fractional Zener model
  • A vegetable oil paper insulation state evaluation method based on a fractional Zener model
  • A vegetable oil paper insulation state evaluation method based on a fractional Zener model

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Embodiment

[0087]In the laboratory, the dried insulating paper is fully soaked in the dried vegetable insulating oil, and then the accelerated aging experiment is carried out to obtain aging samples of different days; in order to reduce the experimental error, the weight of each insulating paper should be controlled to be the same. Using the insulation diagnostic instrument IDAX-300 to measure the frequency-domain dielectric spectrum of the prepared oil-paper insulation aging test samples at 0, 7, 14, 21, 28, and 35 days, the obtained frequency-domain dielectric spectrum images of the vegetable oil-paper insulation aging test samples Such as image 3 , 4 As shown, the applied voltage source is AC low-voltage power supply 140V, and the frequency measurement range is 0.1mHz-1KHz; finally, the average value of the three test results is taken as the final measurement data. In order to avoid being affected by factors such as residual charge, the three-electrode experimental device equipped w...

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Abstract

A vegetable oil paper insulation state evaluation method based on a fractional Zener model comprises the following steps of firstly, deriving the fractional Zener model by utilizing a fractional calculus theory, and establishing a relational expression suitable for vegetable oil paper insulation system fractional Zener model parameters and frequency domain dielectric spectrum characteristic quantity complex dielectric constants; identifying parameter values of the score Zener model respectively; calculating a complex dielectric constant real part theta 'and a complex dielectric constant imaginary part theta ', introducing a concept of coincidence degree, comparing a complex dielectric constant calculated value with a measured value to find that the coincidence degree of the complex dielectric constant calculated value and the measured value is high, and enabling a low frequency band to have higher accuracy, which indicates that the fractional Zener model is suitable for describing therelaxation process of vegetable oil paper; selecting appropriate model parameters a, shape parameters and relaxation time as characteristic quantities for evaluating the aging of the vegetable oil paper insulation system, and establishing a functional relation between the model parameters and the acid value in the oil. According to the method, the fractional order theory is applied to the relaxation process of the dielectric medium, it is found that the fractional Zener model carries more effective information in the test sample, and therefore the aging state of the vegetable oil paper insulation system is evaluated more accurately.

Description

technical field [0001] The invention relates to the field of evaluating the oil-paper insulation state of vegetable oil transformers, in particular to a method for evaluating the insulation state of vegetable oil-paper based on a fractional Zener model. Background technique [0002] As an important structure inside the transformer, the oil-impregnated cardboard insulation system plays the role of insulation and support, and its electrical performance directly affects the reliability of the safe operation of the transformer. At present, the mineral insulating oil used in the power system is difficult to biodegrade. Once leaked, it will pollute the water source and living environment, which prompts people to look for a new type of liquid insulating material that can replace mineral insulating oil. Vegetable insulating oil has the advantages of high flash point and degradability, and can be used as a substitute for mineral insulating oil. Vegetable oils are mixtures of esters ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/10
CPCG06F17/10Y02P90/30
Inventor 张涛张陈王铄杨文雁
Owner CHINA THREE GORGES UNIV
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