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MIDEL 7131 is a biodegradable synthetic ester dielectric liquid designed to provide an alternative to mineral oil, silicone liquid and dry-type transformers.
MIDEL 7131 has a high fire point (316˚C), significantly increasing the fire safety of your transformers and reducing the need for fire protection equipment.
MIDEL 7131 is readily biodegradable, avoiding environmental damage should leakage occur and enabling reductions in containment measures.
MIDEL 7131 has an extremely low pour point of -56˚C, making it a highly effective solution in colder climates.
MIDEL 7131 has exceptionally high moisture tolerance. This characteristic enables the extension of cellulose insulation life.
MIDEL 7131 is currently used in a wide range of transformer applications and is proven up to 433kV. Perfectly suited for non free-breathing and free-breathing transformers (due to its excellent oxidation stability) located indoors or outside.
MIDEL 7131 offers the ability to safely increase transformer loading or reduce transformer size.
|
Typical Values |
Un-used new fluid property requirements |
Test Method |
Property |
|
Physical |
|||
|
125 |
Max. 200 Hazen |
ISO 2211 |
Colour |
|
Clear, free from water and suspended matter and sediment |
Clear, free from water and suspended matter and sediment |
|
Appearance |
|
0.97 |
Max. 1 |
ISO 3675 or ISO 12185 |
Density at 20˚C (kg/dm3) |
|
|
|
ISO 3104 |
Kinematic Viscosity (mm2/sec) |
|
29 |
Max. 35 |
|
at 40°C |
|
1440 |
Max. 3000 |
|
at -20°C |
|
260 |
Min. 250 |
ISO 2719 |
Flash Point PMCC (°C) |
|
316 |
Min. 300 |
ISO 2592 |
Fire Point (°C) |
|
-56 |
Max. -45 |
ISO 3016 |
Pour Point (°C) |
|
No crystals |
No crystals |
IEC 61099 (2010 Annex A) |
Crystallization |
|
Readily Biodegradable |
|
Readily Biodegradable |
Biodegradation |
|
Electrical |
|||
|
>75 |
Min. 45 |
IEC 60156 |
Dielectric Breakdown (kV) |
|
<0.008 |
Max. 0.03 |
IEC 60247 |
Power Factor at 90°C |
|
>20 |
Min. 2 |
IEC 60247 |
DC Resistivity at 90°C (GΩ.m) |
|
Chemical |
|||
|
50 |
Max. 200 |
IEC 60814 |
Water Content (mg/kg) |
|
<0.03 |
Max. 0.03 |
IEC 62021-1 or IEC 62021-2 |
Acidity (mg KOH/g) |
|
|
|
IEC 61125C |
Oxidation Stability (164hr) |
|
0.02 |
Max. 0.3 |
|
Total Acidity (mg KOH/g) |
|
<0.01 |
Max. 0.01 |
|
Total Sludge (% mass) |
MIDEL_7131_Increased_Fire_Safety
MIDEL_7131_Fluid_Maintenance_Guide
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