Network | Three phases - Three wires |
Rated Voltage | 12 - 17,5 - 24 kV |
Service Voltage | .. kV |
System Frequency | 50/60 Hz |
Lightning Impulse withstand Voltage Phase to phase, phase to earth Across the isolating distance | 95 - 125 kV 110 - 145 kV |
Power Frequency withstand voltage | 28 - 38 - 50 kV rms - 1 mn |
Rated Normal Current Line switch Transformer feeder Branch circuit breaker feeder | 400/630 A 200 A 630 A |
Rated Short time current withstand ( 1 sec ) | 12,5 - 16 - 20 - 25 kA |
Rated Short circuit making capacity of line switches and earthing switches | 31,5 - 40 - 50 - 62,5 kA peak at Rated Voltage |
Number of operations at rated short circuit current on line switches, earthing switches and CB | 5 closing operations |
Rated load interrupting current Line switch | 400 - 630 A rms |
Rated cable charging interrupting current Line switch | 30 A |
Rated magnetizing interrupting current Line switch | 16 A |
Number of mechanical operations Line switches and earthing switches Switch-fuse combination Circuit breaker | 1000 O/C 1000 O/C 2000 O/C |
Number of electrical operations at full loop current | 100 O/C |
Number of operations at rated short circuit current on circuit breaker | 3 breaking operations |