Method for judging the number of energy storage elements and the number of relaxation response branches in oil-paper insulation equivalent circuit

Abstract

The invention provides a method for judging the number of energy storage elements and the number of relaxation response branch circuits in an oiled paper insulation equivalent circuit. The method comprises the following steps: m spectral lines can be separated after successive differential spectral decomposition is carried out on the spectral lines of a return voltage differential time domain spectral function of oiled paper insulation equipment by a time domain dielectric spectral decomposition method, and the number of the energy storage elements (polarized capacitors) of the dielectric polarization equivalent circuit of the oiled paper insulation equipment can be judged as m; the number of the relaxation response branch circuits in the equivalent circuit in a black box is N, wherein N=m-1. A blank in the research field of studying oiled paper insulation aging through an extended Debye model is filled by the judging method provided by the invention, and a reliable and powerful analysis means is provided for construction of the oiled paper insulation relaxation response equivalent circuit, in-depth investigation of insulation aging and the like in future.

Description

technical field [0001] The invention relates to a method for judging the number of energy storage elements and the number of relaxation response branches of an oil-paper insulation equivalent circuit. Background technique [0002] At present, in the research field of oil-paper insulation aging diagnosis, the aging status of oil-paper insulation equipment is usually analyzed and indirectly diagnosed by means of the equivalent circuit of the dielectric relaxation response of the extended Debye model. Now it has got the attention of experts and has been widely used. Its equivalent circuit is as figure 1 shown. [0003] However, so far, most researchers have applied figure 1 The equivalent circuit of the relaxation response does not consider or rarely considers the differences in the service life of the oil-paper insulation equipment, the insulation aging status, or other influencing factors, and generally assumes the equivalent circuit of the oil-paper insulation relaxation ...

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Problems solved by technology

[0003] However, so far, most researchers have applied figure 1 The equivalent circuit of the relaxation response does not consider or rarely considers the differences in the service life of the oil-paper insulation equipment, the insulation aging status, or other influencing factors, and generally assumes the equivalent circuit of the oil-paper insulation relaxation response Dotted line box 2 (assumed to be a "black box"), the topology of the equivalent circuit, that is, the number of relaxation response branches is composed of a number of RC series branches connected in parallel. Although such an assumption can also be used to calculate the relaxation of oil-paper insulation equipment Respond to the parameter values ​​of the equivalent circuit, but this assumption lacks a theoretical basis, and it cannot truly reflect the polarization of each component in the oil-paper insulation system during the relaxation response process

The result of its assumption sometimes increases the difficulty of solving the equivalent circuit parameters, and the more serious consequence is that it will affect the accuracy of judging the aging status of oil-paper insulation equipment

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