Characterization of type T1 transformer ester according to IEC 61099 and DIN VDE 0375
Physical properties according to IEC 61099

Chemical properties according to IEC 61099

Dielectrical properties according to IEC 61099

Data quoted above are typical values. It is the policy of M&I Materials LTD to continually improve product quality. The published values above may be altered without notice and do not constitute a specification.

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Dielectric Insulating Fluid

MIDEL^® 7131 is a dielectric insulating fluid for transformers, tapchangers and electrical control equipment. MIDEL^® 7131 conforms to IEC 61099:1992  "Specifications for Unused Synthetic Organic Esters for Electrical Purposes"    It is classified as type T1, a halogen-free pentaerythritol ester.

 

Product Summary

MIDEL^® is an environmentally friendly alternative to conventional transformer fluids, being both readily biodegradable and classified as “non-hazardous to water” according to Umwelt Bundes Amt (UBA) in Germany.

MIDEL^® 7131 transformer fluid has a high Fire Point of 317+5°C and a low net calorific value (<32 MJ/kg) and is therefore classified as a K3 class liquid according to IEC 61100. This, coupled with a slow heat rate due to its high specific hest and thermal conductivity, gives the product its noted resistance to ignition.

MIDEL^® is supplied with a low dissolved gas content and moisture level.

Areas of application:
- power transformers up to 238kV/ 135 MVA
- pole-type transformers
- distribution transformers in urban areas and buildings
- tapchangers
- thyristor cooling in power electronics

Properties
In addition to the properties set out in IEC 61099:1992, MIDEL^® 7131 is characterized by:

Ecological compatibility
- readily biodegradable
- classified as "non- hazardous to water" according to Umwelt Bundes Amt (UBA) in Germany
- low vapor pressure under operating conditions

Low acute and chronic toxicity
- non-toxic to aquatic life
- will not effect the degradation activity of activated sludge in biological sewage treatment plants
- not classified as hazardous.

Good thermal properties
- low thermal coefficient of expansion
- heat transfer properties comparable with mineral oil.

Excellent dielectric properties
- high breakdown strength
- low dependence of dielectric properties on the effects of moisture.

Excellent fire resistance
- high fire point (317+5°C)
- will not ignite in the event of a major electrical fault and transformer rupture.

MIDEL^® 7131 was found to be non-corrosive in independent laboratory tests to ASTM D1275 B, the Standard Test Method for Corrosive Sulphur in Electrical Insulating Oils.

MIDEL^® 7131 is further noted for its very good lubricating properties. MIDEL^® 7131 is compatible with all insulating materials used in conventional transformer construction.

Retrofilling
MIDEL^® 7131 is used to retrofill PCB and mineral oil filled distribution transformers. MIDEL^® 7131's thermal characteristics, cooling performance and electrical properties are equivalent to those of mineral oil. This ensures that there is no need to make any alterations to the design of the transformer or to downrate it when retrofilling with MIDEL^® 7131.
During retrofill, contamination with other insulating fluids has to be minimized to avoid lowering the fire point or endangering the “non-water hazardous“ classification.

Disposal
For disposal, it is recommended that used MIDEL^® 7131or remains of the insulating fluid be burnt in a suitable installation. Waste disposal code 130309 applies (readily biodegradable insulating and heat transmission oils).

Regulations
MIDEL^® is not subject to the regulations for land, sea and air transport. It does not require labeling in accordance with the Dangerous Substances Regulations.

To contact us:

Phone: 585-293-3330

Fax: 585-293-3093

E-mail: info@InlandVacuum.com

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