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Target values of insulating oils from transformers agreed with manufacturers. (Škoda, ČKD)


Measured
value
[units]
At delivery
from
supplier
Before
filling the
machine
Before
putting in
operation
In
guarantee
period
operation
In
operation
Breakdown voltage
[kV/2.5mm]
not measured
>75
>75
>70
>65
Neutralization value
[mgKOH/g]
<0.03
<0.03
<0.04
<0.04
<0.08
Water content
[g/t]
<50
<10
<12
<15
<25
Inerfacial
tension [mN/m]
>50
>50
>50
>45
>38
Dissipation factor
at 90oC [%]
<0.3
<0.3
<0.5
<1
<7
Inhibitor content
[%]
0.3 to 0.5
>0.15
Rezistivity
[
Wcm.1012]
not measured
>200
>100
>100
>5
Gas
volume
[%]
Sealed
not measured
<0.5
<0.5
<2
<3
Non-sealed
not measured
<0.5
<1
<8
<9
Gases
[ppm]
Hydrogen
not measured
0
<1
<40
<150
C1 to C3
not measured
<10
<10
<100
<600
Acetylene
not measured
0
<1
<3
<20
CO
not measured
<2
<2
<200
<500






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