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):-
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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. | 0.2×10¹² ohm-cm | |
ii) | At 27° C, Min. | 2.5×10¹² 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 |