REDRAWABLE SWITCHGEAR BUSHING ELECTRIC FIELD CALCULATION

Za 24 kV skoznjik zračno izolirane izvlečljive celice so bile, izkustveno in na osnovi standardov, določene dimenzije. Treba je bilo preveriti vrednosti električne poljske jakosti in jih primerjati z dopustnimi za izolacijski material araldit in za zrak. Načrtovanje 24 kV skoznjika je bilo izvedeno s pomočjo programskega paketa MF2. Za preskusne napetosti 24 kV električne opreme in ustrezne obratovalne pogoje skoznjika so bile preverjene vrednosti električne poljske jakosti, dodatno pa se spreminjale lastnosti skoznjika za dosego ugodnejše električne poljske jakosti. Na osnovi izračunanih vrednosti je bil izdelan prototip skoznjika in v laboratoriju preskušen po ustreznem standardu. Skoznjik je preskuse uspešno prestal.For 24 kV bushing of air insulated redrawable switchgear were set dimensions, experiential and based on standards. Values of electric field strength had to be checked and compared with permissible values for insulation material Araldite and air. Software package MF2 was used for designing of 24 kV bushing. According to test voltages for 24 kV switchgear and operation conditions allowable values of electric field strength has been verified and additionally parameters of bushing has been altered in order to improve values of electric field strength. Prototype of bushing was manufactured based on the calculated values and successfully tested in laboratory according to appropriate standards