A Method and System for Determining Electric Field Distribution in Transient Process of Multilayer Composite Medium

Abstract

The invention discloses a method and system for determining electric field distribution in the transient process of a multilayer composite medium. The method specifically includes: separately measuring the dielectric spectrum and polarization current of each layer of the multilayer composite medium; Fitting the dielectric spectrum of the j-layer medium to obtain n first equivalent branches of the j-th layer medium; fitting the polarization current of the j-th layer medium to obtain m second equivalent branches of the j-th layer medium According to the first equivalent branch and the second equivalent branch of the jth layer medium, the single medium equivalent model of the jth layer medium is established; the single medium equivalent model of each layer of medium is connected in series , to obtain the equivalent model of the composite medium; based on the equivalent model of the composite medium, the electric field distribution of the multilayer composite medium is obtained. The invention can quickly calculate the electric field distribution in the transient process of the multi-layer medium by establishing the equivalent model of the medium and combining the circuit analysis method, avoiding complicated numerical methods, and greatly reducing the calculation amount and calculation time.

Description

technical field [0001] The invention relates to the technical field of electrical equipment insulation testing, in particular to a method and system for determining electric field distribution in the transient process of a multilayer composite medium. Background technique [0002] For reasons such as insulation coordination, taking advantage of the characteristics of different media, and equipment requirements, multi-layer insulation media are often used in practice, such as oil-paper insulation of transformers, cable joints, and wall bushings. For insulation safety, the electric field in each layer of medium needs to be reasonable, otherwise it may cause equipment discharge and cause safety accidents. [0003] With the large-scale access of new energy and the large-scale application of power electronic equipment, there are many transient voltages on the equipment. The current calculation method for the electric field of multi-layer dielectrics is usually calculated accordin...

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Problems solved by technology

There is no general calculation method for other transient voltages. Generally, it is calculated through finite element simulation and microscopic equations of charge motion. The process is complex and tedious, takes a long time, and cannot calculate complex structures. It is not suitable for the calculation of electric field distribution of electrical equipment insulation structures.

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