Midel 7131 - 195kg Drum

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MIDEL® 7131

Dielectric Insulating Fluid Overview

MIDEL 7131 Product Overview

MIDEL 7131 is a synthetic ester-based dielectric fluid that has been serving the global transformer market for over 30 years. MIDEL 7131 has been specifically formulated to provide a safe, superior alternative to traditional fluid and dry-type transformers and can be used in indoor or outdoor locations.

MIDEL 7131 is a high performance fluid that offers increased fire safety, greater environmental protection and superior moisture tolerance. Testing has also proven that MIDEL 7131 has excellent dielectric properties.

IEC 61099 Conformity

MIDEL 7131 conforms to IEC 61099 “Specifications for Unused Synthetic Organic Esters for Electrical Purposes”. It is classified as type T1, a halogen-free pentaerythritol ester.

Areas of Application

MIDEL 7131 filled transformers are available from all major transformer manufacturers. MIDEL 7131 is suitable for a wide range of transformer applications, including sealed and breathing.

Distribution transformers
Power transformers
Traction transformers
Rectifier transformers
Pole-type transformers
Tapchangers
Thyristor cooling

Retrofilling

MIDEL 7131 has been used to retrofill thousands of distribution transformers to improve service life, reduce environmental hazards or increase fire safety.

Corrosive Sulphur

MIDEL 7131 has been tested by independent laboratories to ASTM D1275 B and IEC 62535, it was found to be non-corrosive.

Increased Fire Safety

MIDEL 7131 has a high fire point and a low net calorific value (<32 MJ/kg) and is therefore classified as a K3 class liquid.

100% fire safety record
High fire point (>300°C)
K-class to IEC 61100 / 61039
FM Global® approved transformer fluid
Reduced fire safeguarding costs

Greater Environmental Protection

MIDEL 7131 is an environmentally friendly alternative to conventional transformer fluids because it is classified as readily biodegradable and non-water hazardous.

Readily biodegradable (OECD 301)
Fully biodegradable (IEC 61039)
Classified as non-water hazardous by (UBA)
Non-toxic
Will not evaporate into the environment
Not detrimental to activated sludge in biological treatment plants
RoHS compliant

High Performance

MIDEL 7131 is an extremely robust fluid that delivers long-term stability even when exposed to extreme temperature variations. MIDEL 7131 also has excellent oxygen stability allowing it to be used in breathing transformers.

Robust and stable at high temperatures over long periods
Suitable for compact transformer design
Superior oxygen stability
Excellent lubricant
No sludge formation

Moisture Tolerance

MIDEL 7131 is moisture tolerant and can absorb far more water than alternative fluids, without compromising the breakdown voltage.

No reduction of breakdown voltage (up to 600ppm / 20°C)
Allows moisture to migrate from cellulose into the fluid
Potentially keeps the cellulose drier and slows the rate of ageing
Very high saturation limit making condensation virtually impossible
Reduced risk of bubble formation

Delivery

MIDEL 7131 can be delivered in 24.5kg, 195kg or 1000kg sealed containers; bulk tanker deliveries available for >20 tonnes.

Disposal

For disposal, it is recommended that used MIDEL 7131 or remains of the insulating