Specifications of Transformer Oil (IEC 296)
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|
Uninhibited Oil |
Inhibited Oil |
Test Method |
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|
I |
II |
III |
IA |
IIA |
III A |
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|
appearance |
Clear, no suspended matter and precipitation |
Clear, no suspended matter and precipitation |
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Density (30°C) Max. |
895 |
895 |
ISO 3675 |
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|
40°C Max. |
16.5 |
11.0 |
3.5 |
16.5 |
11.0 |
3.5 |
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|
-15°C Max. |
800 |
- |
- |
800 |
- |
- |
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|
-30°C Max. |
- |
1800 |
- |
- |
1800 |
- |
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|
-40°C Max. |
- |
- |
150 |
- |
- |
110 |
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|
Flashing point (close cup) Min. |
140 |
130 |
95 |
140 |
130 |
95 |
ISO 2719 |
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|
Pour point Max. |
-30 |
-45 |
-60 |
-30 |
-45 |
-60 |
ISO 3016 |
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The neutralization value after oxidation Max. |
0.40 |
- |
|
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Under slung fat lute after oxidation Max. |
0.10 |
- |
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|
Volatility acid no. 0.28 Min. |
|
|
120 |
|
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Water content Delivery in bulk Max. |
|
IEC 733 |
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|
30 |
30 |
|
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Delivery in drum Max. |
40 |
40 |
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Breakdown voltage Untreated oil Min |
|
ICE 156 |
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|
30 |
30 |
|
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|
Treated oil Min. |
50 |
10 |
|
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|
dielectric loss factor (90°C) Min. |
0.005 |
0.005 |
IEC 247 |
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