Basic physical and technical properties sovtol-10: Dissipation factor at 90 C (no higher). . 0.08 Breakdown voltage at 65 C (minimum )……… 40 kV , mg Koya 1 g of oil (not more )….. 0.02 Viscosity at 65 C (not more )…… 14 Water contamination …………. The disadvantages are absent sovtol include toxicity (it pairs with prolonged exposure to the human respiratory system can lead to poisoning), and the high hygroscopicity of Compared with the transformer oil, a sharp increase in viscosity at low temperatures. For impregnation of windings of magnetic isolation plates, paint details and assembly units used varnishes and enamels.
Insulating varnish insulating GF-95 is a solution glyptal resins, oils and resins used for impregnation, followed by zapechkoy windings. Time to dry (zapechki) – 15 hours at 105-110 C. Insulating Varnish ML-92, obtained by adding to lacquer GF-95 15% melamine formaldehyde resin, used for the same purpose as the GF-95. Time to dry 10-12 hours at 9-100 C. Bakelite lacquer, which is a resin solution resin in ethyl alcohol, has a color from reddish to reddish-brown, baked at 120-130 C, produced brands LBS-1 and LBS-2 and used in transformers for the bonding of insulation strips, rings and other parts. Glued these parts are painted a high mechanical and electrical strength. For the bonding of insulation is used as adhesive stamps MC made on the basis of methylcellulose.
Insulating Varnish number 302, made from the resin, tung oil, kerosene and other components used to isolate the plates of the magnetic system. As the solvent, varnish is a pure filtered paraffin. A number 202 and to use for the same purpose as the lacquer number 302, but in Unlike the latter, it is prepared to linseed oil. Instead of expensive scarce varnishes 302 and 202 of insulating varnish is used more often CF-965. Oil-bituminous varnish 458 black, baked used to impregnate the windings dry Low-voltage transformers. Lacquer solvent is benzene, toluene, benzene. The time it zapechki no more than 4 hours at 105 C. Glyptal-oil enamel GF-92-GS Gray, baking, oil resistant, baked for 3 hours at 105-110 C and used to coat varnish impregnated GF-95 and ML-92 windings and painting of steel parts dry-type transformers. For these purposes use enamel gray XB-124. Oil resistant enamel GF-92-XC gray, cold, drying, dries in for 24 hours at 18-22 C and used as a casing for dry-type transformers. Oil resistant enamel GF-92-HC in red, does not require zapechki used to paint bare branches and steel construction parts and components. Nitroenamels 624S gray, air-drying, dries in 10-12 minutes at 20 C and used for coating the inner surface of the tanks of transformers. Nitroemali 1201 and 1202 air-drying, dry for 10-15 minutes at 20 C used to cover bare busbar and steel structural parts. Enamel PF-133 black and gray colors used for painting the exterior surfaces of tanks, radiators, filters and other thermosyphon the transformer, not in contact with oil.