Dielectric constant distribution optimization method of functional gradient insulator for GIS

Abstract

The invention discloses a dielectric constant distribution optimization method of a functional gradient insulator for a GIS (Geographic Information System), which takes a supporting insulator for theGIS as an optimization model and takes a direction (z axis) from a high-voltage electrode of the insulator to a ground electrode as a direction (z axis) to carry out gradient distribution optimizationcalculation on a dielectric constant. For the purpose of surface electric field distribution homogenization of the insulator, the optimal gradient distribution of the dielectric constant of the insulator is obtained by adopting an iterative calculation method. Wherein the iteration variable of the iteration calculation is an adjustment coefficient k (z) and a dielectric constant r (z) of the insulator; wherein the iteration ending criterion is that the non-uniformity coefficient f of the surface electric field distribution of the insulator is smaller than a preset electric field non-uniformity coefficient f0. The method has important theoretical value and engineering significance for improving the operation stability of the GIS and the safety of the power system.

Description

technical field [0001] The invention belongs to the field of modified polymeric materials and its preparation in the manufacture of high-voltage equipment, and relates to a dielectric constant distribution optimization method for functional gradient insulators used in GIS. Background technique [0002] In recent years, the gas insulated metal closed system (Gas Insulated System, GIS) has become an important direction of power development due to its advantages of high reliability, small footprint, and small maintenance workload. Among them, the performance of solid insulators that provide insulation support for GIS plays a decisive key role in the safe and stable operation of the entire power grid. However, even in the demanding 1000kV AC UHV project, cast epoxy insulators still have frequent failures, among which surface flashover failure is the core problem. [0003] It is generally believed that excessive local electric field is an important cause of flashover faults. Ap...

AI Technical Summary

Problems solved by technology

However, the dielectric constant distribution of the prepared functionally graded insulators has not been designed and optimized, and some existing design algorithms have certain problems in their effectiveness and universality.

Images