The electrical insulation Margin Tape is a key specialty material specifically designed for the insulation of power transformer windings, especially oil-immersed transformers. Its primary function is to precisely build and maintain the required insulation distance (margin) within the winding during coil winding, ensuring a durable and reliable insulation barrier between turns, layers, and ground. It is a core component ensuring the safe operation and long-term stability of the transformer.

Materials of Insulation Margin Tape:

This product employs a carefully designed composite structure:

Base Layer: High-performance electrical insulating polyester film

Absorbing Layer: A specialized non-woven fabric laminated onto the film

Adhesive Layer: A high-performance acrylic pressure-sensitive adhesive coated onto the substrate, with strong initial tack, ensuring firm positioning during winding and compatibility with insulating oil.

We offer a variety of structural options, including single-layer, double-layer, and triple-layer options, allowing customers to flexibly choose according to specific insulation designs, voltage levels, and process requirements to achieve the optimal balance between insulation performance and cost-effectiveness.

Features and Advantages of Electrical Margin Tapes:

• Superior Electrical Insulation Performance: Exhibits extremely high breakdown voltage withstand capability, effectively resisting operating voltage and various overvoltage surges, ensuring absolute reliability of the insulation system.

• Excellent Impregnation and Penetration: The unique non-woven fabric structure quickly and fully absorbs and accommodates transformer insulating oil or impregnating varnish. After vacuum impregnation, it integrates seamlessly with the insulating medium, completely eliminating air gaps and forming a robust oil-paper composite insulation system with higher dielectric strength.

• Excellent Temperature Resistance and Thermal Stability: The product has a good temperature tolerance range, can withstand the heat generated by transformer operation for extended periods, and can withstand the high temperatures during drying, impregnation, and other processes without performance degradation.

• Strong Mechanical Adaptability: Combining flexibility and tear resistance, it is easy to handle during automatic or manual winding, tightly conforming to conductors and complex contours to form a uniform, gapless insulation layer.

Application of Insulation Margin Tapes:

1. Constructing radial and axial insulation margins for oil-immersed power transformer windings (high-voltage/low-voltage coils).

2. Used to isolate segments of different voltage levels and fix insulation positions.

3. As interlayer insulation or filler insulation, supplementing the main insulation system.