FDS-based oilpaper capacitive bushing series polarization model building method

Abstract

The invention discloses an FDS-based oilpaper capacitive bushing series polarization model building method. The method comprises the following steps of: 1, enabling each layer of capacitive medium ofan oilpaper capacitive bushing to be equivalent through connecting a capacitor and a resistor in parallel; 2, simulating a relaxation polarization phenomenon of each layer of capacitive medium througha branch circuit connected with the capacitor and the resistor in series, and enabling a relaxation polarization project of each layer of capacitive medium to be equivalent through connecting an RC series branch circuit on the basis of the step 1, so as to obtain a polarization circuit mode of each layer of the oilpaper capacitive bushing; and 3, connecting the n polarization circuit models, obtained in the step 2, of the layers of the oilpaper capacitive bushing to obtain an oilpaper capacitive bushing series polarization model. According to the method, the problem that the model parameter estimation is not correct enough as oilpaper capacitive bushing modeling time domain dielectric spectrum maps are easy to be interfered by environmental noise is solved.

Description

Technical field: [0001] The invention belongs to the modeling technology of an oil-paper capacitor bushing of a power transformer, in particular to an FDS-based modeling method for a serial polarization model of an oil-paper capacitor bushing. Background technique: [0002] The oil-paper capacitive bushing is an important current-carrying component of a power transformer. As the hub of the transformer's internal insulation and connection to the external power grid, due to the combined effects of long-term overvoltage, mechanical pressure, thermal stress, and moisture, the electrical and mechanical properties It will gradually deteriorate and further cause insulation failure, directly endangering the safe operation of the transformer and the reliability of power supply. Therefore, it is of great significance to accurately evaluate the insulation state of the oil-paper capacitor bushing to ensure the safe and stable operation of the power grid. [0003] Establishing the equiva...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a FDS-based modeling method for series polarization model of oil-paper capacitive casing to solve the problem that most of the oil modeling for oil-paper capacitive casing in the prior art is based on time-domain dielectric response—RVM The equivalent model parameters were identified with the PDC curve, and the time-domain dielectric spectrum is susceptible to environmental noise interference, which leads to inaccurate model parameter estimation. It is proposed to establish an oil-paper capacitive bushing insulation equivalent model through the frequency-domain dielectric spectrum FDS curve. , which can effectively solve the problem of insufficient anti-interference ability of time-domain spectrogram

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