800kV Dead-tank CB,800kV CB

1, superior interrupting performance The SF6 circuit breaker produced at our company can interrupt various normal load currents (including line charging current, small inductive current) and various fault currents. The interrupters with superior performance not only withstand critical rate of rise of recovery voltage in short line fault, but also withstand peak of higher recovery voltage in out of phase breaking. In switch exciting current the over voltage is less than 2 times that of service voltage. In switching charging current neither restrike nor reignition occurs. Its superior interrupting capability also reflects in asymmetrical interrupting capability (T100a) with DC component at 81% and higher electrical endurance. 2, Reliable dielectric and current carrying capability Since SF6 gas is used as insulation medium for the product and with even distribution of internal electrical field in the design, lighting impulse withstand voltage have reached the level of 1000kv switchgear. Therefore, such product has high and reliable dielectric capability. The product has two sets of independent contact systems: namely arc contact system for breaking and making operation and main contact system for normal current carrying, thus the product has high numbers of electrical endurance and reliable current carrying capability. 3, Superior stability and seismic resistance performance Dead tank SF6 circuit breaker with current transformer in it has perfect contamination resistance capability, compact structure, small land occupation are and stronger seismic resistance performance. Especially the dead tank circuit breaker with excellent stability is more preferable for the extra high voltage application. Item Technical data Unit 800kV CB (double breaks) Installation Indoor or outdoor Ambient air temperature -30 40 °C Altitude 1000; 2000; 3000 m Seismic intensity 9 Richter scale Degree of Contamination III Ice coating thinkness ≤10 mm Wind ≤ 35 m/s Rated voltage 800 kV Rated current 5000 A Rated frequency 50 Hz Rated lightning impulse withstand voltage (peak) kV To earth 2100 kV Across breaks 2100 + 460 kV Rated switching impulse withstand voltage (peak) kV To earth 1550 kV Across breaks 1300 +650 kV Rated short time power frequency withstand voltage (1 min) kV To earth 960 kV Across breaks 960 +320 kV Rated short circuit breaking current 50 kA Rated short circuit making current (peak) 135 kA Rated short-time withstand current 50 kA Rated peak withstand current 135 KA Rated short circuit duration 2 s Rated operating sequence O-0.3s-CO-180s-CO Open time 15-21 ms Breaking time ≤ 40 ms Closing time ≤ 100 ms Dead time for auto reclosing 300 ms Mechnical endurance ≥ 5000 Times Number of breaks per pole 2 Mechanism Pneumatic or hydraulic Applied standard GB 1984, IEC 62271-100