BK-130
10-3
CHECKING OIL PURITY
Typical Test Data for Transformer Oil
TEST
METHOD
UNITS
SPECIFICATION
Moisture
ASTM D1533
Mg/kg
35 max
Color
ASTM D1500
ASTM
0.5 max
DDF (Power Factor) @100ºC
ASTM D924
0.3 max
0.3 max
Breakdown voltage (2mm gap)
ASTM D1816
kV
35 min
Inhibitor Content
ASTM D2668
%w/w
0.30 max
Interfacial tension
ASTM D971
dynes/cm
40 min
Density @15ºC
ASTM D1298
g/ml
0.91 max
Viscosity @ 100ºC
ASTM D445
cSt
3.0 max
Viscosity @ 40ºC
ASTM D445
cSt
12.0 max
Viscosity @ 0ºC
ASTM D445
cSt
76.0 max
Refractive Index
ASTM 1218
Units
Carbon N%
ASTM D2140
%
Carbon A%
ASTM D2140
%
Carbon P%
ASTM D2140
%
Corrosive Sulfur
ASTM D1275B
Noncorrosive
PCBs
– Detection Unit 1 mg/kg
ASTM D4059
mg/kg
Not Detected
Flash Point
ASTM D92
0ºC
145 min
