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  Insulating Varnishes

Introduction to Insulating Varnishes:

Varnish coating, also termed as Secondary Insulation, is a significant component of the insulation system of an electrical machine. Varnishes, of dissimilar types are employed in the insulation system of electrical machines for the reason of impregnation and finishing applications.

Benefits of these coatings are as follow:

1. Greater mechanical bonding to the winding wires

2. Enhanced dielectric properties

3. Enhanced thermal conductivity

4. Protection to the winding in opposition to moisture and chemically corrosive environment.

Varnishes are categorized based on:

A. Applications of varnish.

B. Type of (varnish) curing method.

C. Based on main raw material used in varnish.

Insulating varnish derived from applications:

I. Impregnating varnish

II. Finishing varnishes     

III. Core plate varnishes

IV. Bonding varnishes      

V. Special purpose varnishes

Insulating varnish derived from Curing method:

I. Air drying type

II. Oven baking type

Major raw material that are employed: Epoxy ester Melamine, Polyester mide, Alkyd Phenolic, Alkyd, Modified polyester, Epoxy, Polyurethane, Isophthalic Alkyd, Phenolic, Phenolic Melamine - based. The above described varnishes arrives Solvent based and Solvent-less based.

Method of applying varnish:

1. Applying a coating with a paint brush           

2. Dipping the specimen into varnish

3. Vacuum pressure method     

Conveyorised dip method.

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