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T-1500U Oil (Tu 38.401-58-107-97) Is Produced From Sulfur Paraffinic Oils Using Selective Purification And Hydrogenation Processes. Contains The Additive Ionol. It Has Improved Stability Against Oxidation, Has A Low Content Of Sulfur Compounds, And A Low Dielectric Loss Tangent. Recommended For Use In Electrical Equipment With Voltages Up To 500 Kv And Higher. Transformer Oils Are Used For Filling Power And Instrument Transformers, Reactor Equipment, As Well As Oil Switches; In The Latter Devices The Oils Perform The Functions Of An Arc-Extinguishing Medium Ii-Standard. The Electrical Insulating Properties Of Oil Are Determined Mainly By The Dielectric Loss Tangent. The Dielectric Strength Of Transformer Oils Is Mainly Determined By The Presence Of Fibers And Water, So Mechanical Impurities And Water In The Oils Must Be Completely Absent. A Low Pour Point Of Oils (-45 °C And Below) Is Necessary To Maintain Their Mobility At Low Temperatures. To Ensure Effective Heat Removal, Transformer Oils Must Have The Lowest Viscosity At A Flash Point Of At Least 95, 125, 135 And 150 °C For Different Brands. Indicators T-1500U Kinematic Viscosity, Mm2/S, At A Temperature Of 40 °C: - 11, Kinematic Viscosity, Mm2/S, At A Temperature - 30 °C: - 1300, Acid Number, Mg Koh/G, No More Than: 0.01, Flash Temperature, °C In A Closed Crucible, Not Lower: - 135, Temperature, °C Solidification, Not Higher Than: -45, Sulfur, % (Wt. Fraction): 0.3, Stability, Indicators After Oxidation, Not More Than: - Volatile Low Molecular Weight Acids Mg Koh/G) – 0.05; -Acid Number, Mg Koh/G – 0.2; Transparency At 20 °C: Dielectric Loss Tangent At 90 °C, %, No More Than 0.5 Color, Units. Cnt, No More Than -1.5, Corrosion On A Copper Plate – Withstands, Density At 20 °C, Kg/M3, No More Than – 885, Oxidation Conditions When Determining Stability According To The Gost 981-75 Method: Temperature, °C – 135, Duration, H – 30 Oxygen Consumption, Ml/Min – 50
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