Test Name
Method
Unit
New Oil
Sample
Desired
Value
New Oil Fiiling
Transformer
Oil Sample
Desired Value
Oil Sample From Operating
Transformer
Proper
Separation
Changing
Breakdown
Voltage
VDE 370
kV
Min. 50
Min. 50
≥
40
< 40
Colour Number
ASTM D1500
Numerical
Max. 0.5
Max. 1
< 5
≥
5
Water Content
ASTM D 1533
Ppm
Max. 30
Max. 20
< 20
≥
20 - < 50
≥
50
Acidity
ASTM D
664-974
mgKOH/g
Max. 0.025
Max. 0.025
< 0.4
>0.4 - < 0.5
≥
0.5
Interior Surface
Tension
ASTM D 971
dyne/cm
Min. 40
Min. 40
≥
21
≥
17 - < 21
< 17
Loosing Factor
(25⁰C)
ASTM D 924
%
Max. 0.05
Max. 0.1
Loosing Factor
(100⁰C)
ASTM D 924
%
Max. 0.30
Max. 1
≤
1.5
> 1.5 -
≤
3
> 3
Test Name
Method
Unit
New Oil
Sample
Desired Value
New Oil Filling
Transformer Oil
Sample Desired
Value
Oil Sample From Operating
Transformer
Proper
Must Be
Removed
Pcb Analysis
ASTM D 4059
ppm
NA
NA
< 50
> 50
Test Name
Method
Unit
New Oil
Sample
Desired
Value
New Oil Filling
Transformer Oil
Sample Desired
Value
Oil Sample From Operating
Transformer
Proper
Must Be
Removed
Anti Oxidation
Additive (Dbpc)
ASTM D 4768
%
0.2 – 0.3
0.2 – 0.3
0.2 – 0.3
< 0.2
Test Name
Method
Unit
New Oil Sample Desired Value
Density
ASTM D 1298
gr/cm
3
0.865 – 0.910
Table 4:
Transformer Oil Test Results Assessment -1
Table 5:
Transformer Oil Test Results Assessment -2
Table 6:
Transformer Oil Test Results Assessment -3
Table 7:
Transformer Oil Test Results Assessment -4
Ulusoy Distribution Transformers Maintenance, Operation, Installation and Instruction Manual
