Method for obtaining potential distribution of 1,000kV metal oxide arrester

Abstract

The invention discloses a method for obtaining potential distribution of a 1,000kV metal oxide arrester. The method comprises the steps of (1) simulating potential distribution of the metal oxide arrester in normal running: (1-1) building a three-dimensional mathematic model of the potential distribution of the metal oxide arrester; (1-2) assigning a relative dielectric constant epsilon according to material attributes of components of the metal oxide arrester; (1-3) applying a forced potential boundary condition; and (2) solving the three-dimensional mathematic model according to the assigned relative dielectric constant epsilon and the forced potential boundary condition so as to obtain potential distribution when resistors in different positions cause a short circuit or are damped. According to the method, the complete three-dimensional model of the 1,000kV zinc oxide arrester is built; the peripheral space of the arrester is simulated by using a finite large air domain; and the potential of a suspended conductor is processed by utilizing a freedom coupling function in ANSYS, so that the potential distribution of the arrester is accurately calculated while the calculation scale is reduced.

Description

technical field [0001] The invention belongs to the technical field of state monitoring and fault criterion of UHV metal oxide arresters, and more specifically relates to a method for obtaining potential distribution of 1000kV metal oxide arresters. Background technique [0002] With the rapid development of my country's electric power industry and economy, as well as the growth of power transmission corridors, transmission lines and substation technologies are developing in the direction of high voltage and large capacity. Surge arresters are the main equipment for limiting overvoltage in the operation of the power grid. They are the basis for the insulation coordination of the power grid and the guarantee for reliable operation. The quality of its insulation performance is directly related to the stability of the power grid operation. Since the gapless metal oxide arrester has no series gap, it will gradually age or deteriorate under the influence of normal working voltage...

AI Technical Summary

Problems solved by technology

[0004] In view of the above defects or improvement needs of the prior art, the present invention provides a method for obtaining the potential distribution of a 1000kV metal oxide arrester. Provide reasonable and reliable fault criteria, thereby solving the technical problem of online identification of internal faults in arresters

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