Extra-High Voltage Power Cables
Extra-high voltage (EHV) XLPE cables are designed for high-load, high-voltage transmission networks requiring robust insulation, efficient heat dissipation, and long-term operational stability. The cross-linked polyethylene (XLPE) insulation system provides excellent dielectric properties, thermal stability, and strong mechanical performance in both dry and humid environments.
Key Features
Performance Requirements
Highly Uniform Insulation
XLPE insulation is produced from ultra-clean polyethylene combined with crosslinking compounds and stabilizers. The material must be precisely mixed and fully dispersed to achieve consistent dielectric strength, aging resistance, and minimal moisture absorption.
Smooth, Bonded Interfaces
The interfaces between the conductor shield, insulation, and insulation shield must be smooth and void-free. Any irregularity or poor adhesion can cause local field intensification and partial discharge, significantly reducing cable lifespan.
Zero Defects in the Insulation Layer
Voids, moisture, contaminants, and protrusions must be eliminated. Under high voltage, these defects accelerate discharge, water-treeing, and insulation degradation.
Operating Temperature
These cables are engineered to operate with conductor temperatures of up to 90°C under normal loading, 130°C under short-duration emergency loading, and up to 250°C for short-circuit conditions lasting up to 5 seconds.
Customized Design
Cables can be custom-designed and manufactured to customer requirements, including 66 kV and 230 kV ratings, to meet various voltage levels and system needs.
Voltages
66kV-345kV
Applications
Industries
Voltages
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