66,126,145kVGIS ,gas insulated switchgear

Main features: 1. Excellent interrupting capability Design interrupter units can withstand severe RRRV in case of any short-line fault. When switching induced current, overvoltage is lower than 2 times of service voltage. When switching capacitive current, no re-ignition and re-strike occur. 2. Dielectric reliability and current-carrying capability SF6 gas feature will not be attenuated with the time changing; hence the reliability can be assured. The gas can also prevent the contact from oxidization and other chemical reaction.3. Minimized maintenance work Spring mechanism requires minimized maintenance work; the SF6 gas will not attenuate and the contact wearing can be neglected. 4. Minimized operation noise Due to no released gas, the operation noise can be minimized. 5. Excellent anti-seismic capability Simple structure and small weight allow the product an excellent anti-seismic performance. 6. Air-free and oil-free Air-free and oil-free for all mechanism, which ensures reliable and safe service. 7. Minimized SF6 gas leakage rate SF6 gas system is placed more reasonably without gas valves and pipes, using new type self-sealing adaptor, which minimizes the gas leakage rate. 8. Main bus current 4000A, rated short-time current 40kA, rated short-circuit time 4s. 9. Intelligent and digital control, in stead of electromagnetic relay control method; more flexible and convenient. gas insulated switchgear Item Technical data Unit 72.5 kV GIS126 kV GIS145 kV GISInstallation Indoor or outdoor Ambient air temperature -30 40 °C Radiation of sunlight 0.1 W/cm2 Humidity (per month) ≤ 90 % Altitude 1000 2000 3000 m Wind ≤ 35 m/s Earthquake intensity Horizontal acceleration 0.4 g Vertical acceleration 0.2 g Creepage distance General pollution 1.7 cm/kV Light pollution 2.1 cm/kV Severe pollution 2.5, 3.1 cm/kV Nominal voltage 66 110 132 kV Rated voltage 72.5 126 145 kV Rated normal current 1250,1600,2000,3150 (main bus: 4000A) A Rated frequency 50 Hz Rated short-time withstand current 31.5, 40 kA Rated peak withstand current 80, 100 kA Rated lightning impulse withstand voltage (peak) 325 550 650 kV Rated power frequency withstand voltage (1min) 140 230 275 kV Visible corona No corona at 1.1 of rate phase-voltage Radio interference Less than 500 μV at 1.1 of rate phase-voltage SF6 gas pressure Rated: 0.5 CB; 0.4,0.5 others MPa Alarm: 0.45 CB; 0.3,0.35,0.4 others MPa Lockout 0.4 CB MPa Annual leakage rate of SF6 gas ≤ 0.5 % Moisture content of gas apartment CB ≤ 150 ppm Other unit ≤ 250 ppm Type of enclosure 3-phase in one enclosure Material Enclosure Steel/ Al Conductor Al/Cu Contact Silver-plated Cu