| | · | 550SR is a single breaker construction having an excellent breaking capability by the puffer arc extinction with dual motion system | · | Adoption of high capable and reliable hydraulic mechanism for circuit breaker | · | Certificated by the newly revised IEC standards | | Circuit breaker : Certificated in International Authorization Laboratory-KEMA in accordance with IEC62271-100 | · | One phase in one enclosure type | | | | | Item | 550kV GIS | Model | 550SR | Rated Voltage (kV rms) | 550 | Rated Short-circuit Breaking Current (kA rms) | 50 | Rated Current (A rms) | 4000 | Rated Frequency (Hz) | 50 / 60 | Rated Power Frequency Withstand Voltage (kV rms) | 710 | Rated Lightning Impulse Withstand Voltage (kV peak) | 1550 | Rated Switching Impulse Withstand Voltage (kV peak) | 1175 | Rated Gas Pressure (Mpa) | 0.7 / 0.45 | | | | | 550SR | · | Circuit Breaker | | - Puffer method for arc extinction operated by hydraulic operation | · | Make-proof Earthing Switch | | - Motor spring operation | · | Disconnector Switch | | - Motor operation | · | Earthing Switch for Maintenance | | - Motor operation | | |