Description
Technical Comparison Matrix
| Performance Characteristic / Parameter | Medium-Voltage SF6 Gas Ring Main Unit Technical Specifications |
| System Operating Voltage (Ur) | 36 kV / 38 kV |
| Operating Frequency Range | 50 Hz / 60 Hz |
| Switchgear Classification and Enclosure Integrity |
• Partitioning Class: PM (Metallic Partitioning) • Service Continuity: LSC2 |
| Dielectric Impulse Insulation Level (BIL Peak) |
• Phase-to-Earth / Phase-to-Phase: 170 kVp • Across Isolating Distance: 195 kVp / 220 kVp |
| Power-Frequency Withstand Voltage (1 min dry) |
• Phase-to-Earth / Phase-to-Phase: 70 kV • Across Isolating Distance: 80 kV |
| Ingress and Mechanical Impact Protection |
• Indoor Enclosure: IP41 | Outdoor Enclosure: IP54 • HV Component Hermetic Tank: IP67 • Mechanical Impact Class: IK10 |
| Internal Arc Withstand Capacity | AF / AFLR Class: 25 kA for 1 s |
| SF6 Gas Medium Parameters |
• Annual Leakage Rate: ≤ 0.1% per year • Rated Filling Pressure (20°C): 0.4 Bar (G) • Minimum Functional Pressure: 0.3 Bar (G) |
| Environmental and Site Service Conditions |
• Maximum Installation Altitude: ≤ 1000 m above sea level • Max. Relative Humidity (24 h average): 95% • Ambient Temperature Range: -25°C to +55°C |
| Main Busbar Performance Characteristics |
• Continuous Load Rating: 630 A • Short-Time Withstand: 21 kA (3 s) / 25 kA (1 s) • Peak Dynamic Current: 52.5 kA / 62.5 kA |
| Load-Break Switch Functionality (L-Function) |
• Continuous Current Rating: 630 A • Cable Charging / Line Charging Breaking: 35 A / 35 A (Combined: 60 A) • Earth Fault Breaking: 105 A • Short-Time Withstand and Peak Current: 21 kA (3 s) / 25 kA (1 s); Peak: 52.5 kA / 62.5 kA • Mechanical and Electrical Endurance: Mechanical Class M1, Electrical Class E3 (Switch) / Class E2 (Earthing) |
| Circuit Breaker Functionality (V-Function) |
• Continuous Rating: 200 A / 630 A • Short-Circuit Breaking Capacity: 25 kA • Short-Circuit Making Current: 50 kA / 62.5 kA • Cable and Line Charging Breaking: 100 A (Cable) / 10 A (Line) • Short-Time Withstand and Peak Current: 21 kA (3 s) / 25 kA (1 s); Peak: 52.5 kA / 62.5 kA • Mechanical and Electrical Endurance: Mechanical Class M1 (Breaker) / Class M0 (Earthing), Electrical Class E2 |
| Earthing Circuit Ratings |
• Short-Time Withstand: 21 kA (3 s) / 25 kA (1 s) • Peak Dynamic Current: 52.5 kA / 62.5 kA |
| Control and Drive Mechanisms |
• Manual Operation: Hand lever with push-button trip • Remote Control: Electric motor drive with shunt trip coil • Standard Operating Duty Cycle: O – 3min – CO – 3min – CO |
| Mounting Dimensions and Enclosure Size |
• Height: 1690 mm (Bushing Connection Height: 653 mm) • Depth: 870 mm • Width (3-Panel Assembly): 1210 mm • Width (4-Panel Assembly): 1610 mm |
