Transformer insulating crepe paper

I. Core Product Performance
1. Electrical Performance
High Breakdown Voltage: Power frequency breakdown strength ≥18 kV/mm (normal conditions). The breakdown strength is further improved after impregnation in transformer oil, effectively resisting electric field impacts during equipment operation and preventing insulation breakdown.
High Volume Resistivity: ≥10¹⁴ Ω·m (room temperature). Stable insulation resistance reduces the risk of leakage current and ensures the reliability of equipment insulation.

1. **Moderate Dielectric Constant:** Matches the dielectric constant of transformer oil (approximately 3.0~3.5), avoiding electric field distortion and reducing the probability of partial discharge.

2. **Physical and Mechanical Properties:**
**Excellent Flexibility:** The wrinkled structure provides good tensile strength (longitudinal elongation at break ≥8%) and tear resistance, allowing for tight wrapping of windings, conductors, and other irregular components, adapting to equipment assembly process requirements.
**Uniform Basis Weight:** The standard basis weight range is 20~80 g/m², with a thickness deviation ≤±5%, ensuring uniform insulation layer thickness and avoiding localized weak points.
**High Oil Absorption:** The well-developed pore structure results in an oil absorption rate ≥200% (for transformer oil), enabling rapid and thorough impregnation to form an oil-paper composite insulation system, improving overall insulation performance.

3. **Chemical Stability:**
**Good Oil Resistance:** Excellent compatibility with mineral transformer oil and synthetic ester insulating oil; no swelling or degradation occurs during long-term immersion, and no harmful substances are produced.
Strong anti-aging ability: Contains antioxidant components (or undergoes modification treatment), resulting in a slow aging rate under the combined effects of high temperature (≤105℃) and electric field, with a service life ≥20 years (meeting transformer design life requirements).
Low ash content: Ash content ≤0.1%, reducing conductive impurities and avoiding partial discharge or insulation degradation caused by impurities.

4. Environmental adaptability
Heat resistance rating: Standard is Class A (heat resistance temperature 105℃), modified products can reach Class B (130℃), meeting the heat resistance requirements of transformers of different capacities.
Moisture resistance: Moisture content ≤6% under normal conditions, and performance can be restored after moisture absorption through drying, adapting to environmental humidity changes during transformer production, storage, and transportation.