Description
Transposed Technical Comparison Matrix
| Performance Characteristic / Parameter | Medium-Voltage Dry Air RMU Technical Specifications |
| System Rated Voltage (Ur) | 24 kV |
| Rated Operational Frequency | 50 Hz |
| Continuous Load Current Capacity (Ir) | 630 A |
| Short-Time & Peak Withstand Capability | 20 kA (3 s duration) | Peak Current: 50 kA |
| Phase-to-Earth Short-Circuit Withstand | 20 kA (1 s duration) | Peak Current: 50 kA |
| Insulating Gas Pressure Thresholds |
• Nominal Fill Pressure (abs.): 250 kPa • Minimum Functional Level (abs.): 230 kPa |
| Dielectric Withstand Voltage Ratings |
• Power-Frequency (1-min dry): 50 kV • Lightning Impulse (BIL Peak): 125 kV |
| High-Voltage DC Cable Diagnostics | 60 kV DC applied for 60 minutes |
| Load Break Switch Functionality |
• Charging Breaking Capacity: Cable: 60 A | Line: 1.5 A • Earth-Fault Breaking Capacity: 180 A (Cable/Line under earth-fault: 104 A) • Peak Short-Circuit Making Current: 50 kA • Endurance Classification: Switch: E3, C2, M1 | Earth Switch: E2, M0 |
| Fused Combination Switch |
• Main Breaking Capacities: Active Load: 200 A | Closed-Loop Line: 200 A • Line & Cable Breaking: Cable: 16 A | Line: 1.5 A • Earth-Fault Interrupting Capacity: 48 A (Under fault conditions: 28 A) • Short-Circuit Interrupting Rating: 20 kA • Downstream Earthing Capacity: 2.5 kA (1 s) | Peak: 6.3 kA • Endurance Classification: Switch: M1 | Earthing Switch: E2, M0 |
| Vacuum Circuit Breaker |
• Short-Circuit Breaking Capacity: 20 kA (3 s duration) • Standard Operating Duty Sequence: O – 0.3s – CO – 15s – CO • Line & Cable Charging Interruption: Line: 10 A | Cable: 31.5 A • First Pole-to-Clear Factor ($$K_{pp$): 1.3 and 1.5 • Circuit Breaker Endurance Class: E2, C2, S1, M2 • Earthing Switch Capacity: 20 kA (3 s 3-phase / 1 s single-phase) | Class: E2, M1 |
