Electrical oil composition

Abstract

An electrical oil composition comprising: A) dc-asphalted cylinder oil (DACO) having a benzo [a] pyrene content of not more than 1 mg/kg and a total content of benz [a] anthracene, chrysene, benzo [b] fluoranthene, benzo [j] fluoranthene, benzo [k] fluoranthene, benzo [c] pyrene, benzo [a] pyrene and dibenz [a, h] anthracene of not more than 10 mg/kg; and B) one or more base oils each having a viscosity of not more than 4.0 mm 2 /s at 100° C.

1 . An electrical oil composition comprising (A) de-asphalted cylinder oil (DACO) having a benzo[a]pyrene content of not more than 1 mg/kg and a total content of benz[a]anthracene, chrysene, benzo[b]fluoranthene, benzo[j]fluoranthene, benzo[k]fluoranthene, benzo[e]pyrene, benzo[a]pyrene and dibenz[a,h]anthracene of not more than 10 mg/kg; and (B) one or more base oils each having a viscosity of not more than 4.0 mm2/s at 100° C. 
   
   
       2 . Electrical oil composition according to  claim 1 , wherein the one or more base oils (B) are selected from one or more mineral-derived paraffinic oils, one or more mineral-derived naphthenic oils, one or more Fischer-Tropsch derived base oils and mixtures thereof. 
   
   
       3 . Electrical oil composition according to  claim 1 , wherein said composition has been subjected to a clay treatment. 
   
   
       4 . Electrical oil composition according to  claim 1 , wherein said composition comprises one or more pour point depressant additives. 
   
   
       5 . Electrical oil composition according to  claim 1 , wherein said composition comprises one or more metal passivator additives. 
   
   
       6 . Electrical oil composition according to  claim 5 , wherein said one or more metal passivator additives are benzotriazole derivatives. 
   
   
       7 . Electrical oil composition according to  claim 1 , wherein said composition comprises one or more anti-oxidants. 
   
   
       8 . Electrical oil composition according to  claim 7 , wherein said composition comprises di tert-butylated hydroxytoluene (BHT) as an anti-oxidant. 
   
   
       9 . Electrical oil composition according to  claim 1 , wherein said composition passes the CIGRE A2.32.01 Covered Conduct Deposition test for corrosive sulphur and/or the ASTM D 1275 B test for corrosive sulphur. 
   
   
       10 . Use of the composition according to  claim 1  as an electrical oil for application in one or more of transformers, regulators, circuit breakers, power plant reactors, shunt reactors, switch gears, cables and electrical equipment.