Oil paper insulation performance analysis method and device considering non-uniform medium

Abstract

The invention discloses an oil paper insulation performance analysis method and device considering a non-uniform medium. An existing oiled paper insulation equivalent model cannot accurately reflect the polarization condition of a non-uniform medium interlayer. The invention discloses an oil paper polarization equivalent model considering interlayer polarization. The polarization response processof actual oil-paper insulation can be better reflected, a parameter identification method of an equivalent model is provided based on frequency domain dielectric response actual measurement data of the oil-paper insulation, numerical approximation of an original spectrogram is achieved, and goodness of fit is introduced to serve as an index for evaluating the accuracy of the parameter identification method.

Description

technical field [0001] The invention relates to a polarization analysis method for oil-paper insulation, in particular to a method and device for analyzing the performance of oil-paper insulation considering non-uniform media. Background technique [0002] The dielectric will produce the microscopic dielectric behavior of conductance and polarization under the applied electric field, and at the same time, it will be reflected in the corresponding voltage or current response on the macroscopic level, which is the dielectric response. At this time, the dielectric properties of the dielectric can be obtained by measuring the dielectric response current or voltage, and the dielectric properties can be used as a medium to analyze the insulation state factors that affect the properties (such as the moisture content of the insulation after being damp, aging degree, etc.), this method is called the dielectric response method. According to the type of dielectric response, it can be ...

AI Technical Summary

Problems solved by technology

Existing studies have found that the extended Debye model identified by the time-domain dielectric spectrum has a poor reconstruction effect on the high-frequency range of the FDS spectrum, and there is a large deviation between the model calculation curve and the measured curve. This high-frequency deviation indicates that Parameter identification of extended Debye model using time-domain dielectric spectrum cannot meet the requirements of broadband modeling

In contrast, FDS has a wide frequency range and strong anti-interference ability. Therefore, in theory, the model obtained directly by FDS curve identification will have good broadband accuracy, which is an effective way to extract feature quantities by using FDS broadband dielectric information. However, there is little research on oil-paper insulation modeling combined with FDS and an equivalent model considering interlayer polarization.

The research status shows that although there is no technical difficulty in using time-domain dielectric spectrum for modeling, its high-frequency error problem makes it very necessary to find a method that can directly use frequency-domain dielectric response data for oil-paper insulation polarization equivalent Efficient approach to model parameter identification for broadband matching to dielectric information

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