The Core Role of Insulation Materials in High-Voltage Cables
2025-09-24
The insulation layer of high-voltage cables (≥35 kV) is critical for ensuring safe power transmission. Commonly made from cross-linked polyethylene (XLPE), this material boasts excellent properties such as high-temperature resistance, superior electrical strength, and outstanding aging performance. Not only does the insulation prevent current leakage and short circuits, but it also protects against moisture, chemical corrosion, and mechanical damage. The manufacturing process involves advanced techniques like three-layer co-extrusion and dry-type cross-linking to eliminate defects such as air bubbles, which could otherwise lead to partial discharges—potentially compromising the cable's lifespan and reliability.
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