baroi izolyatsiya va qattiq tutish simlar dar havodagi elektr uzatish liniyalari va taqsimlash qurilmalarida elektr stansiyalari va podstantsiyalari o'zgaruvchan tokda 10-20 kV kuchlanish bilan 100 Gts gacha chastotada atrof-muhit harorati +50 S dan -60 S gacha.
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