Transformer Oil IS:335

Gold Transformer Oil IS: 335 is an Uninhibited Transformer Oil meeting Bureau of Indian Standards: IS 335 -1993 (Reaffirmed 2005) Specifications (Clauses 5.1 and 9.1):-

Sr.No. Test Properties Test Method Specification
1 Appearance A representative sample of the oil shall be examined in a 100 mm thik layer @ 27°C The oil shall be Clear & Transparent & free from suspended matter or sediments
2 Density @ 29.5, °C, Max IS : 1448 (P16) 1977  0.89 g/cm ³
3 Viscosity, Kinematic IS : 1448 (P25) 1976  
a) at 27°C, cSt   27.00
b) at 40°C, cSt   Under Considration
4 Interfacial Tension, 27° C, Min IS 6104:1971 0.04 N/m
5 Flash Point (PMCC), Min. IS : 1448 (P21) 1992 140° C
6 Pour Point, °C, Max IS : 1448 (P10) 1970 -6
7 Neutrilization Value IS :1448 (P2)1967  
a) Total Acidity, Max.   0.03 mg KOH/gm
b) Inorganic Acidity/ Alkalanity   Nil.
8 Corrosive Sulfur Annex B Non Corrosive
9 Electric Strenth (BDV)    
a) New unfiltered oil, Min.   30 kv (rms)
b) After filtration, Min   if the above value is not attained the oil shall be filtered 60 kv (rms)
10 Di-electric discipation factor (Tan Delta) @ 90° C, Max. IS : 6262 :1971 0.002
11 Specific Resistance (Resistivity) IS : 6103 :1971  
a) at 90°C, Min.   35 x 10¹² ohm-cm
b) at 27°C, Min.   1500 x 10¹² ohm-cm
12 Oxidation Stability Annex C  
a) Neturalization Value after oxidation, Max   0.4 mg KOH/g
b) Total Sludge, after oxidation, Max   0.1% by weight
13 Ageing Cheracterstic after asselerated ageing (Open Beaker method with copper catalyst) IS : 12177:1987 Method A  
a) Specific resistance, (Resistivity) IS : 6103:1971  
i) At 90° C, Min.   0.2x10¹² ohm-cm
ii) At 27° C, Min.   2.5x10¹² ohm-cm
b) Di-electric discipation factor (Tan Delta) @ 90° C, Max. IS : 6262:1971 0.20
c) Total Acidity, Max IS : 1448 (P-2) 1967 0.05mgKOH/g.
d) Total Sludge value, Max. Annex, A of is 12177 0.05% by weight
14 Presence of oxidation inhibitor, % by weight IS :13631:1992 The oil shall not contain antioxidant additives.
15 Water Content, Max. IS :13567:1992 50 ppm
16 SK Value Annex D Under Consideration
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