Midel 7131 Synthetic Ester Transformer Fluid

Midel 7131 Synthetic Ester Transformer Fluid

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MIDEL 7131 is a synthetic ester dielectric fluid designed to provide an alternative to mineral oil, silicone fluid and dry-type transformers.

Developed in the 1970s, MIDEL 7131 is today a highly trusted fluid used in thousands of new transformers to increase safety. Also during this time, MIDEL 7131 has gained an excellent reputation as a cost effective transformer retrofill fluid for the replacement of flammable mineral oil.

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Synthetic Ester Transformer Fluid Advantages

MIDEL 7131 offers more than just the benefits of greater fire safety in a transformer fluid. There are several advantages to be gained in cost and risk reductions, deployment innovations, corporate social responsibility, and asset performance.

MIDEL 7131 is also the only synthetic ester approved by both FM Global (Factory Mutual) and UL (Underwriters Laboratories).

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Superior oxygen stability

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For non free-breathing and breathing systems

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Proven up to 433 kV

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High performance in cold

 
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MIDEL 7131 Product Brochure

Synthetic Ester Transformer Fluid

 

Why use MIDEL 7131 Synthetic Ester Fluid?

 

INCREASED FIRE SAFETY

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.

  • 100% fire safety record

  • High fire point (>300°C) – K class classification

  • K3 classification (IEC 61039)

  • Suitable for indoor, outdoor and underground installations

GREATER ENVIRONMENTAL PROTECTION

MIDEL 7131 is readily biodegradable, avoiding environmental damage should leakage occur and enabling reductions in containment measures.

  • Readily biodegradable

  • Not detrimental to activated sludge in biological treatment plants

IDEAL SOLUTION FOR COLD CLIMATE

MIDEL 7131 has an extremely low pour point of -56˚C, making it a highly effective solution in colder climates.

  • Very low pour point: -56˚C

EXTENDS TRANSFORMER LIFE

MIDEL 7131 has exceptionally high moisture tolerance. This characteristic enables the extension of cellulose insulation life.

  • Absorbs large amounts of moisture with no reduction of breakdown voltage (up to 600ppm)

  • Allows moisture to migrate from cellulose into the fluid, thus extending cellulose life

  • Very high saturation limit (2,700 ppm @ 20˚C) making precipitation of free water virtually impossible

ENABLES INNOVATION

MIDEL 7131 offers the ability to safely increase transformer loading or reduce transformer size.

It is currently used in a wide range of transformer applications up to 433kV. Perfectly suited for non free-breathing and free-breathing transformers (due to its excellent oxidation stability) located indoors or outside.

  • Allows for compact transformer design

  • Option to run at a higher temperature, for a standard lifetime

  • Provides a higher power output, without the need for high temperature insulation

 
 
 

MIDEL 7131 Case Studies

 
 

MIDEL 7131 Applications

 
 
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