Abstract
Gas insulated transmission lines (GILs) are used in electrical systems mainly for power transmission and High Voltage substation interconnection. In this paper, we focus on the development of complex numerical tools for the optimization of gas insulated HVDC components by the estimation of realistic electric field distribution and the voltage holding of the designed geometry. In particular, the paper aims at describing the correct modelling approach suitable to study high voltage components in DC, considering the nonlinear behaviour characterizing the electrical conductivity of solid and gas insulators. The simulated field distribution is then adopted to estimate the voltage holding of the dielectric gas, with a convenient engineering technique, based on the streamer criterion. These two tools are integrated in an automatic optimization package developed in COMSOL® and MATLAB®, with the purpose of adjusting the critical geometry features, suffering from excessive electrical stress and possibly giving rise to electrical breakdown, in order to guide the designer towards a robust solution.
Highlights
Electric Field ModellingThe electric field distribution within insulating materials under DC voltage is different from that under AC excitation, depending both on the electrical permittivity and the conductivity of materials [10,11]
Consorzio RFX (CNR, ENEA, INFN, Università di Padova, Acciaierie Venete SpA), Corso Stati Uniti 4, Department of Industrial Engineering, University of Padova, 35131 Padua, Italy
The solid insulator separates a High Voltage (HV) electrode from a Low Voltage (LV) one at the bottom, all immersed in gas with a certain pressure in a cylindrical chamber with height H = 600 mm and radius W = 300 mm
Summary
The electric field distribution within insulating materials under DC voltage is different from that under AC excitation, depending both on the electrical permittivity and the conductivity of materials [10,11]. In order to correctly study the charge accumulation mechanism in HVDC-GIS, the non linear conductivity in the solid dielectrics, the physical processes affecting the motion of charge particles in the gas and the surface conductivity at the gas-solid interfaces must be considered at the same time [12]
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