Transformer Oils

HP TRANSFORMER OIL I

HP TRANSFORMER OIL I

Detail Description

HP TRANSFORMER OIL I is inhibited type transformer oil meeting IS:12463. Inhibited transformer oils can extend the service life of transformer oil.

It also meets IS:335-2018 TYPE II INHIBITED.

Physico-chemical properties

  Test Method Typical
Appearance A representative sample of the oil shall be examined in a 100 mm thick layer at 27ºC Clear and transparent  and free from suspended matter or sediments
Density at 29.5ºC, g/cc IS 1448 [P : 16] : 1990 0.8279

Kinematic viscosity, 

at 27ºC

at 40ºC

IS 1448 [P : 25] : 1976

 

 

 

16.46

11.76

 

Interfacial tension at 27ºC, IS 6104 : 1971 0.044
Flash point Pensky-Marten (closed), ºC IS 1448 [P : 21] : 1992 148
Pour point, ºC IS 1448 [P : 10] : 1970 -18

Neutralization value

a) Total acidity,

b) Inorganic acidity/alkalinity

 

IS 1448 [P : 2] : 1967

 

 

Nil

Nil

Corrosive sulphur Annex B of IS 335 - 1993 Non Corrosive

Electric strength 

(breakdown voltage)

a) New unfiltered oil,

b) After filtration, min

 

IS 6792 : 1992

 

Note 2

72

Dielectric dissipation factor (tan δ)

at 90ºC,

IS 6262 : 1971 0.00025/2.05 DC

Specific resistance (resistivity)

a) At 90ºC,

b) At 27ºC,

 

IS 6103 : 1971

 

 

 

750 × 1012 ohm-cm

7650 × 1012 ohm-cm

Oxidation stability

a) Neutralization value
after oxidation,

b) Total sludge, after oxidation,

IS 12422 - 1988

 

Nil

Nil

Oxidation stability (Rotating

Bomb test), minutes

IS 12958 - 1990 210
Oxidation inhibitor, percent by, wt IS 13631 - 1993 0.26
Water content, ppm IS 13567 - 1992 9
 
 

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