UNE HD 620 S3

Standard Overview

UNE HD 620 S3 – Distribution Cables with Extruded Insulation (3.6/6 kV to 20.8/36 kV) ensures safety, reliability, and performance for medium-voltage power cables in Spanish and European markets. It aligns with CENELEC HD 620 S3 while incorporating national administrative requirements.

Key Technical Requirements

• Voltage Rating
  • U₀/U (Um): 3.6/6 (7.2) kV to 20.8/36 (42) kV
• Conductor
  • Copper or aluminum per IEC 60228
• Insulation
  • XLPE (Cross-linked polyethylene) or EPR (Ethylene Propylene Rubber)
• Shielding (for ≥ 6 kV)
  • Conductor screen (semi-conductive layer)
  • Insulation screen (semi-conductive layer)
• Testing Requirements
  • Partial discharge test (≤ 10 pC at 1.73U₀)
  • 4-hour voltage test (3.5U₀)
  • Tan delta measurement (for HV cables)

Applications

• Public power distribution networks
• Industrial power supply systems
• Renewable energy grid connections

Compliance &Related Standards

• IEC 60502-2 (International equivalent)
• CEI HD 620 S3 (Italian adoption)
• DS/HD 620 S1/A3