SF 6 gas insulated switchgear plays an important role in electric power networks all over the world due to its merits as compared to traditional air insulated switchgear. According to a numerous studies, it appears very difficult that any pure gas can bring a solution to the issue of desirable insulation ability and low environmental impact, so the mixtures composed of a strongly electronegative gases with high dielectric strength such as SF 6 and ordinary gases (N 2 , CO 2 , or Air) are used to reduce the gas price and liquefaction temperature. From this point of view, various types of gas mixtures such as(5%SF 6 +5%CO 2 +90%Air), (5%SF 6 +40%CO 2 +55%Air),(5%SF 6 +80%CO 2 +15%Air),(5%SF 6 +5%N 2 +90%Air),(5%SF 6 +40%N 2 +55%Air) and (5%SF 6 +80% N 2 +15%Air) are used inside compressed gas devices to give a higher dielectric strength with lower cost and lower environmental impact. In this paper, the Finite Elements Method (FEM) is used to evaluate the electric field distribution on and around multi-contaminating filamentary wire particles. The effect of two contaminating particles which one of them is rested at ground plate and other is hovering inside the gap on the electric field values are studied. The effect of three contaminating particles which are rested at ground plate on the electric field values are also studied. The effect of gas pressure, SF 6 gas concentration in mixture, gap spacing and height between particles on the breakdown voltage calculations are also studied.
SF 6 gas insulated switchgear plays an important role in electric power networks all over the world due to its merits as compared to traditional air insulated switchgear.The mixtures composed of a strongly electronegative gases with high dielectric strength such as SF 6 and two ordinary gases such as N 2 and Air or CO 2 and Air with a various fractional concentrations are used in this paper to reduce the gas price and liquefaction temperature. From this point of view, various types of gas mixtures are used inside gas insulated switchgear (GIS) to give a higher dielectric strength. In this paper, the Finite Elements Method (FEM) is used to evaluate the potential and electric field distributions on and around contaminating filamentary wire particle at two positions, first is resting on the earthed plate and second is hovering inside the gap. The effects of particle dimensions such as (length, radius) and gap spacing on the electric field values are also studied. The breakdown voltage calculations under uniform field in case of clean gap and non-uniform field in case of gap with particle contamination are studied. The effects of gas pressure, SF 6 gas concentration in mixture, gap spacing and particle dimensions on the breakdown voltage calculations are also studied.
The presence of metallic contaminating particles lowered the dielectric strength of the gas sharply. The determination of the insulation breakdown inside gas insulated bus duct requires the knowledge of the field distribution inside it. Finite Element Method (FEM) has been used throughout this work, for its favorable accuracy, to calculate the electric field distribution inside the bus duct. In this paper, the electrostatic modeling of gas insulated bus duct (GIBD) with particle contamination is studied. The effect of particle length, hemi-spherical radius and ratio (L/r) on the electric field values is presented. The effect of the dielectric coating of the inner surface of enclosure, is presented and discussed. Multi-contaminating fixed particles are considered in this work and the electric field distribution in this case is presented. The effect of particle length and radius of middle fixed particle of multi contaminating particles on the electric field values are also studied. Electric field distribution around disc-spacer with and without an earthed particle contamination is presented and discussed. Finally, the effect of distance between particle and spacer on the electric field values is also studied.
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