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Products » Insulation materials for transformers winding »

Insulation materials for transformers winding

лентыTo ensure reliable and continuous exploitation of electrotechnical, radio engineering and electronic devices many developers pay special attention to the choice of insulation materials. At present time in the market there is a wide range of insulating tapes and glass fabrics which differ from each other by electrical, mechanical and chemical properties. Among important characteristics of such materials one can noted:

  • high dielectric strength
  • electrical resistivity
  • permittivity
  • dielectric loss
Furthermore, when designing winding components for various purposes especially important properties of the insulating materials are the mechanical strength, flexibility, elasticity, heat and frost resistance in a wide temperature range, hygroscopicity, chemical resistance to solvents and other. For example, when choosing a tape it is recommended to take into a consideration the operating temperatures specified in the table. The using of the corresponding tape's class will provide a work of a whole device for 20,000 hours.

Insulation class Rated temperature
Y 90°C
A 105°C
B 130°C
F 155°C
H 180°C
C 200°C

Insulating self adhesive tapes are widely used in a winding production for the following operations:
  • interwinding insulation performance
  • interlayer insulation materials fixing
  • turns mounting
  • external insulation of winding
  • cores fixing during assembling
  • electrical safety increasing
  • design of marketable style for transformers
As adhesives electric tapes can be used:
  • A - acrylic adhesive. It has chemical resistance to solvents and resistance to aging up to 155°C.
  • AT - acrylic-thermosetting adhesive
  • AS - acrylic adhesive with silver particles
  • R - rubber (natural). In conditions of constant temperature maintenance its value must not exceed 130°C
  • RT -natural rubber thermosetting
  • RTF - rubber fire-resistant thermosetting adhesive
  • Si - silicone adhesive
  • SiT - silicone thermosetting adhesive
As a insulating tapes base may be used: polyester; fiberglass; polyester reinforced with glass filaments; laminates based on polyester and others.
According to consumers request an electrical tape can be cut to any desired width.

Polyester tape

Polyester is characterized by improved insulating properties and a defined permeability at film thickness 25 microns. The using of an acrylic adhesive provides resistance to solvents and chemical environments.

Polyester tape
Insulation class B 130°C
Series Backing Adhesive Backing thickness, mm Total thickness, mm Color Adhesion to steel, N/25mm Tensile strength, N/25mm Elongation,
%
Dielectric strength (VDE 0303) Read more
R31 polyester film RT 0.025 0.051 Yellow 12.30 110.0 100 5000 Далее
54113 polyester film AT 0.025 0.060 Clear 12.30 110.0 100 5000 Далее
54143 polyester film AT 0.035 0.076 Clear 13.70 166.0 100 7500 Далее

Polyester tapes reinforced with glass filaments

Polyester reinforced with glass filaments is mainly used as a protective supporting material in oil transformers. Polyester film provides resistance to breakdown, and the introduction of glass filament increases the breaking load. Such tapes are suitable for cable winding, insulation basic, external protection and insulation leaded wires.

Polyester tapes reinforced with glass filaments
Insulation class F 155°C
Series Backing Adhesive Backing thickness, mm Total thickness, mm Color Adhesion to steel, N/25mm Tensile strength, N/25mm Elongation,
%
Dielectric strength (VDE 0303) Read more
4238 polyester film/
glass filaments
AT 0.165 0.190 Clear 12.00 1642.00 5 6000 Далее
51597 polyester film/
glass filaments
AT 0.138 0.165 Clear 11.00 1095.00 5 5000 Далее

Tapes on the base of glass cloth

The advantages of such a basis are plasticity and flexibility, heat resistance, tensile strength and chemical resistance. Tapes on the base of glass cloth are suitable for all types of insulation.

Tapes on the base of glass cloth
Insulation class F 155°C
Series Backing Adhesive Backing thickness, mm Total thickness, mm Color Adhesion to steel, N/25mm Tensile strength, N/25mm Elongation, % Dielectric strength (VDE 0303) Read more
4616 glass cloth RT 0.127 0.178 White/Black 13.70 767.00 3 3000 Далее
4617 glass cloth AT 0.127 0.178 White 11.00 875.00 3 3000 Далее
Insulation class C 200°C
4618 glass cloth SiT 0.127 0.178 White 12.30 810.00 3 3000 Далее

Additional information

Materials in stock

Stock

To find out presence and price of the interested tape and to place your order, you can in our online-stock.

 
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