A Characterization Method of the Effective Field Feature Set of a Typical Symmetrical Electrode Gap Structure

Abstract

The invention discloses a method for characterizing the effective field feature set of a typical symmetrical electrode gap structure. The method includes: constructing a simulation model of the symmetrical electrode gap, dividing the finite element grid and calculating the electrostatic field distribution, and extracting the connection between the ends of the two electrodes. The value of the electric field intensity on the line path, with the minimum value of the electric field intensity on the path as the boundary value E cr , the area formed by the grid cells whose electric field strength between the two electrodes is greater than the boundary value is defined as the effective field area that has a strong correlation with the gap breakdown, and it is divided into the high-voltage electrode sub-field and the ground electrode sub-field, The electric field strength and cell volume of all grid cells were extracted in the two sub-fields, and 45 characteristic quantities related to the electric field distribution were calculated accordingly to form an effective field feature set to characterize the gap structure. The effective field feature set provided by the present invention can provide a reference for studying the characteristic area triggering gap breakdown, and is suitable as an input parameter of a gap breakdown voltage prediction model.

Description

technical field [0001] The invention belongs to the technical field of high voltage and insulation, and in particular relates to a characterization method of an effective field feature set of a typical symmetrical electrode gap structure. Background technique [0002] The discharge characteristics of the air gap is one of the basic issues of long-term concern in the field of high-voltage power transmission and transformation. Due to the lack of a perfect discharge theory, the insulation design can only rely on the discharge characteristic test, and the relationship between the discharge voltage and the gap distance and other simple geometric parameters can be obtained through the test. However, the cost of the test research is high and the cycle is long. It is necessary to carry out the air gap discharge voltage prediction. Research. Typical symmetric electrode gaps such as ball gap and rod-rod gap have simple geometric structures and can be used as an entry point to study ...

AI Technical Summary

Problems solved by technology

However, for typical symmetrical electrode gaps such as ball gaps and rod-rod gaps, using the characteristic quantities of "the entire area, discharge channel, electrode surface, discharge path" and other areas to characterize may cause redundant features, and only the "shortest The relevant characteristic quantities defined by the "path" are often difficult to fully reflect the spatial structure of the air gap.

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