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Transformer Insulation Paper – Aramid

Transformer Insulation Paper Manufacturer in India

Reliable Electrical Insulation for Transformer Winding & Coil Construction

The transformers are subject to continuous heat and electric stress. In case of one weak point in the insulation of windings, there will be chances of break down or loss of energy or even breakdown of equipment. Hence, the selection of proper transformer insulation paper becomes one of the most important choices in the designing and manufacturing of transformers.

In Harnawa Insulations, we are a prominent transformer insulation paper manufacturer in India and manufacture our own range of insulation papers that are used for the specific purpose of manufacturing of transformers. These transformers’ insulation papers have high dielectric strength and are made up of heat insulation paper.

What is Transformer Insulation Paper?

Transformer Insulation Paper is a specific type of electrical grade paper that acts as an insulator for the windings, lamination and conductors within a transformer. It helps prevent electrical breakdown between the layers of windings, can withstand high temperatures and retain dielectric strength under thermal and mechanical stresses.

Insulation paper in transformers should have a number of qualities such as:

High dielectric breakdown voltage
High thermal resistance under operating temperatures ranging from class B to class H
High mechanical strength to bear winding tension
Moisture resistance and chemical resistance
Conformity to international standards of electrical insulation

Since transformers are designed to work for a long time (20–30 years and more), the quality of insulation paper affects their lifespan greatly.

Dry Type Transformer Insulation Paper

Dry type transformer insulation paper is used to ensure reliable electrical and thermal insulation in transformers that operate without insulating oil. This helps in separating the windings, conductors, and other electrical elements in the transformer and provides insulation capabilities at operating temperatures.

In dry type transformers, the insulating material should provide excellent dielectric strength, thermal resistance, mechanical strength, and dimensional stability. At Harnawa Insulations, we have transformer insulation papers that suit different winding and coil insulation needs of transformers including those that work under high temperature levels.

Among our insulation papers are aramid insulation papers and nomex insulation papers that are used where there is a need for increased thermal endurance and reliable electrical insulation. Such materials may be used for winding insulation, inter-layer insulation, conductor insulation, slot and coil insulation depending on the design of the transformer and required insulation class.

Applications in Dry Type Transformers

The uses of dry type transformer insulation paper include:

Transformer winding insulation
Inter-layer insulation between winding segments
Conductor and coil insulation
Electrical isolation between winding components
High temperature transformer applications
Transformer manufacturing, maintenance, and rewinding

Selection of the right insulation paper is based on thermal class, dielectric strength, thickness, mechanical strength and transformer design among others. Harnawa Insulations supplies different types of insulation papers that suit transformer and electrical equipment manufacturers.

Why Choose Harnawa as Your Transformer Insulation Paper Manufacturer in India

Being an ardent manufacturer in India, Harnawa Insulations integrates world-class materials technology with domestic manufacturing and supply reliability to enable Indian transformer manufacturers get quick deliveries and technical assistance with no delays associated with importation.

Key reasons engineers and procurement teams choose us:

Dielectric Strength – Our papers are made with the capacity of handling high dielectric strengths, thus being safe for use even during voltage spikes.
Thermal Class Availability – Starting from Class B (130°C) to Class H (180°C+), depending upon your transformer’s thermal class needs.
DuPont Nomex & Metastar Aramid Papers – Besides supplying our made papers, we also offer internationally reputed aramid papers from various brand manufacturers.
Strict Quality Check Process – Every lot is analyzed for its dielectric strength, tensile strength, and thickness.
Nationwide Distribution in India – Being an Indian manufacturer of these papers, we provide our products to transformer OEMs and repair companies all over India.
Certified Manufacturing Process – In accordance with ISO 9001:2015, UL, CE, RoHS, and REACH certifications.

Applications of Transformer Insulation Paper

Our transformer insulation paper is widely used across:

Power and Distribution Transformers – Winding conductor insulation by layers and turns
Dry-Type Transformers – High temperature insulation not requiring oil immersion
Oil-Filled Transformers – Insulation paper that works well for oil immersion in transformers
Insulation Paper for Transformer Coils and Former – Structural and electrical insulation when coiling the transformer
Transformer Repair and Rewinding Equipment – Insulation paper to be used for repairs

Apart from transformers, this paper is useful for motors, generators, and capacitors.

Industries We Serve

Harnawa Insulations supplies transformer insulation paper to a wide range of industries, including:

Frequently Asked Questions

1.Which insulation paper is best for transformer winding insulation?

Transformer winding insulation made of Nomex and Aramid papers (for example, DuPont Nomex 410/411 or Metastar YT 510/511) is considered to be an industrial norm because of their excellent thermal endurance (Class H, up to 220°С) and dielectric qualities.

2.Why to opt for Indian transformer insulation paper manufacturer rather than ordering it abroad?

Buying insulation paper of transformer from India ensures shorter delivery times, absence of import customs fees, quicker technical assistance and ability to place smaller orders than with foreign suppliers.

3.Are transformer insulation paper and motor winding insulation paper the same?

They are similar regarding composition (Nomex/Aramid-based), however thickness and other qualities (calendering, thermal class etc.) can vary due to different requirements for transformers and motors.