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1928 — ELEKTROTEKNISK TIDSSKRIFT — No. 20
6
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A/s National Industri
Hovedkontor: Bygdø Allé 1, Oslo.
Telegr,: »Kobber« — Telefon: 41940.
FABRIK: DRAMMEN
Repræsentert i Bergen, Trondhjem, Kristiansand, Hamar og Drammen.
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Høiskapacitetsoljebrytere
forarbeidet ved vore fabriker i Drammen efler Wéstinghouse konstruktion. Brytningskapacitet
10600 anip. ved 12 000 volt, basert paa de amerikanske prøveserier 2 O. C. 0. (0. C. O. angir
bryternes stillinger: aapen, hikket paa kortslutning, aapner momentant; efter 2 min. interval
gjentas samme operation). Max. strømkapacitet i 5 sek. 50000 amp. Bryterne er eksplosionssikre
med den runde beholder oljetæt bollet til del hvælvete støpestaalslaak. Paa laaket er anbragt et
dæmpningskammer hvorigjennem luften i bryteren kan undvike. Man undgaar derved en blanding
av de eksplosive lysbuegaser med luftens surstof inde i selve bryteren. Oljeskvæt forekommer
ikke. Alle isolationsdele er vertikale saa avleiring av slam og aske med derav følgende overslag
undgaaes. Den indvendige mekanisme bestaar av bearbeidede sløpestaalsarme med solide lagringer.
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