In reactive power compensation, choosing high-quality metallized film capacitors is essential for long-term operational stability. While capacitor quality is influenced by multiple factors—including personnel, machinery, raw materials, manufacturing processes, and testing environments—our experience at Taizhou Flyda Electronic confirms that raw materials, particularly the metallized film, are the most decisive factor in a capacitor’s performance.
1. Primary Dielectrics for Power Capacitors
As a core medium in power capacitors, the metallized film directly dictates the service life and reliability of the final product. Currently, the industry primarily utilizes two types of metallized films:
- Pure Aluminum (Al) Metallized Film: Known for its stability and excellent oxidation resistance.
- Zinc-Aluminum (Zn-Al) Metallized Film: Widely used for its superior self-healing properties and cost-effectiveness in specific voltage ranges.
2. The Critical Balance of Surface Resistance (Square Resistance)
The surface resistance (often referred to as square resistance) is a key technical parameter that affects both the safety and efficiency of the capacitor. At Taizhou Flyda Electronic, we emphasize the following technical trade-offs:
- Higher Surface Resistance: A thinner metallized layer increases resistance, which enhances the self-healing capability of the film (especially in metallized polyester or polypropylene). However, this comes at the cost of reduced current-carrying capacity and increased dielectric loss.
- Lower Surface Resistance: A thicker metallized layer reduces resistance and improves current handling, but may compromise the film’s ability to self-heal during a dielectric breakdown.
3. Our Solution: Gradient (Heavy-Edge) Metallized Film
To overcome the limitations of traditional uniform coating, Taizhou Flyda Electronic focuses on advanced gradient square resistance (or heavy-edge) technology.
By precisely controlling the deposition process, the thickness of the metallized layer gradually decreases from the edge to the center. This design:
- Uniformly distributes current density across the plate.
- Optimizes the balance between high current-carrying capacity at the contact area and superior self-healing performance in the active dielectric area.
- Significantly improves the withstand voltage compared to ordinary metallized films.
Conclusion
At Taizhou Flyda Electronic, we don’t just manufacture film; we engineer the heart of the capacitor. By mastering the nuances of metallized layers and material science, we ensure that our partners produce capacitors that are safer, more durable, and more efficient.