Description
Technical Comparison Matrix
| Performance Characteristic / Parameter | Medium-Voltage Air-Insulated Switchgear Technical Specifications |
| System Operating Voltage Rating | 7.2 kV – 12 kV – 17.5 kV – 24 kV (up to 27.6 kV) |
| AC Power-Frequency Withstand Voltage (1 min) |
• 7.2 kV Class: 20 kV • 12 kV Class: 28 kV • 17.5 kV Class: 38 kV (42 kV for high-dielectric variants) • 24 kV Class: 50 kV |
| Impulse Withstand Voltage (BIL Peak) |
• 7.2 kV Class: 60 kVp • 12 kV Class: 75 kVp • 17.5 kV Class: 95 kVp • 24 kV Class: 125 kVp |
| Operating Frequency | 50 Hz / 60 Hz |
| Short-Time Withstand Current Capacity |
• 3-Second Rating: Up to 50 kA (7.2–17.5 kV) | Up to 31.5 kA (24 kV) (25 kA in double-busbar arrangement) • 1-Second Rating: Up to 63 kA (7.2–17.5 kV) (4-second withstand options available) |
| Dynamic Peak Making Current | Up to 164 kA (7.2–17.5 kV) | Up to 80 kA (24 kV) |
| Internal Arc Classification (IAC AFLR) |
• 1-Second Arc Withstand: Up to 50 kA (7.2–17.5 kV) | Up to 31.5 kA (24 kV) (25 kA for double busbar) • 0.5-Second Arc Withstand: Up to 63 kA (7.2–17.5 kV) • Extended Capacity: Back-to-back duplex arrangements support up to 40/50 kA |
| Main Busbar Continuous Current Rating (40°C Ambient) | Up to 4000 A (7.2–17.5 kV) | Up to 2500 A / 3150 A (24 kV) (4000 A option available) |
| Feeder and Breaker Current Ratings (Natural Cooling) |
• 7.2–17.5 kV Feeder Ratings: 630 A, 1250 A, 1600 A, 2000 A, 2500 A, 3150 A, 4000 A • 24 kV Feeder Ratings: 630 A, 1250 A, 1600 A, 2000 A, 2300 A, 2500 A • Vacuum Contactor Bay Rating: 400 A |
| Breaker Current Ratings (Forced Ventilation) |
• 7.2–17.5 kV Class: 3600 A / 4000 A • 24 kV Class: 2500 A / 3150 A |
| Enclosure Footprint and Structural Dimensions |
• 12 kV / 17.5 kV Class: Depth: 2021 mm | Height: 2200–2595 mm (depending on low-voltage compartment) | Widths: 650 mm, 800 mm, 1000 mm • 24 kV Class: Depth: 2570 mm | Height: 2400–2720 mm | Widths: 800 mm, 1000 mm |
