Crepe Paper: Reliable Electrical Insulation for Medium and High Voltage Transformers
Electrical insulation plays a crucial role in the design and operation of transformers: it ensures separation between active components, minimizes energy losses, and extends the lifespan of the equipment. In this technical context, crepe paper has become the optimal solution due to its high conformability, dielectric performance, and thermal resistance.
This technical material is derived from virgin fiber kraft paper, processed through a creping technique that modifies its structure, resulting in a flexible and stretchable surface. In medium and high voltage applications, crepe paper provides continuous and effective electrical insulation, adapting to components with irregular geometries and enhancing compatibility with dielectric oils.
Characteristics of Crepe Paper for Electrical Applications
Crepe paper used in transformers must meet demanding mechanical and electrical specifications. The most valued properties by manufacturers in the sector include:
High Conformability
Thanks to its creped structure, the paper easily conforms to complex contours such as connections, coil exits, or curved areas. This ensures a precise and uniform electrical insulation application in critical zones.
Excellent Impregnability
Its porous surface and embossed design promote complete impregnation with dielectric oils, improving the electrical performance of the system and preventing bubbles or voids.
Superior Dielectric Properties
Technical crepe paper offers high dielectric strength, essential for withstanding electrical stress in transformers. Its impurity-free structure and insulating capacity remain stable throughout the equipment´s service life.
Thermal and Mechanical Resistance
It is engineered to withstand thermal and mechanical stresses during operation and assembly, avoiding breaks or deformation. Thermoset crepe paper variants further enhance durability under extreme conditions.
Applications of Crepe Paper in Transformer Electrical Insulation
Technical crepe paper is used in various parts of a transformer, depending on its format and elongation grade. Common applications include:
- Conductor Insulation
Used to wrap copper or aluminum conductors before winding, acting as primary or secondary electrical insulation. - Coil Layer Separators
Separates different winding layers, improving thermal dissipation and preventing electrical arcs between turns. - Connection and Joint Protection
Its high flexibility allows coverage of sensitive points like terminals or soldered areas, ensuring full electrical insulation. - Taping of Cores and Structural Components
In some cases, it serves as an insulating and fixing layer around magnetic cores or internal anchors.
Types of Crepe Paper Available at Arrosi
At Arrosi, we supply technical crepe paper tailored to the specific needs of the electrical sector, offering both technical specifications and custom delivery formats:
Variable Elongation
Available in elongation grades ranging from 10% to over 60%, allowing selection of the most suitable option depending on the required conformability.
High-Purity Kraft Base
Produced from 100% virgin fiber kraft paper, without additives or fillers, ensuring excellent thermal stability and consistent electrical insulation properties.
Customized Formats
We deliver rolls, cut-to-size strips, washers, tubes, and other die-cut parts, optimizing material use in automated industrial environments.
Advantages of Crepe Paper Over Other Insulating Materials
Compared to synthetic materials or plastic films, technical crepe paper offers key benefits:
- High compatibility with dielectric oils, enabling uniform impregnation
- Superior adaptability, essential for components with complex shapes
- Recyclable and natural-origin material, aligned with sustainability goals
- Cost-effective compared to other technical solutions
- Flexible processing, with custom formats to streamline assembly
Arrosi’s Technical Commitment and Quality
At Arrosi, we manufacture and process technical paper solutions for highly demanding industrial sectors such as electrical. Our electrical insulation crepe paper undergoes strict quality controls in thickness, elongation, grammage, impregnability, and thermal resistance.
Thanks to our customization and tailored supply capabilities, we collaborate with transformer manufacturers and electrical sector suppliers who demand reliability, traceability, and technical support.
Crepe Paper as a Reference Technical Solution
Crepe paper is a proven, safe, and efficient solution for electrical insulation in power transformers. Its properties make it indispensable in medium and high voltage applications, where insulation quality defines the equipment’s performance and longevity.
