embedded pole for 24kV circuit breaker

ELECTRICAL RATINGS(3PHASE) SYMMETRICAL BASIS 1.Rated Frequency50/60Hz2.Rated Maximum Line to Line Voltage24kV,r.m.s3.Rated Power Frequency Withstand Voltage:Air 65/79kV,r.m.s4.Rated Impulse Withstand Voltage:Air125/145kV,Peak5.Rated Normal Current3150A6.Rated Short-Circuit Current(3Phase Symmetrical Basis)31.5kA,r.m.s7.Percentage D.C. Component of Rated S.C. Breaking Current50%8.Rated Short-Circuit Making Current80kA,Peak9.Rated Duration of Short Time Current3s10.Rated Short Time Withstand Current31.5kA,r.m.s11.Rated Peak Withstand Current80kA,r.m.s12.Maximum Contact Resistance at Minimum Closing Force20Micro ohms13.Capacitor Switching Capacity(Single Bank)400A,r.m.sMECHANICAL DATA1.Contact Force from Atmospheric Pressure19.8kgFMECHANICAL REQUIREMENTS(REF. VCB)1.Contact Stroke13±1 mm2.Opening Speed(average of 75 contact gap) 1.0-1.6m/Sec3.Maximum Overtravel During Opening2mm4.Maximun Rebound During Opening2mm5.Closing Speed(average of last 30% contact gap)0.7-1.1m/Sec6.Maximum Contact Bounse Duration(with maximum 2 bounces)0.002Sec7.Rated Contact Compressive Force320-370kgFLIFE (ESTIMATED)1.Electrical Life at Rated Normal Current30,000Operations2.Electrical Life at Rated Short Circuit Current50Operations3.Mechanical Life30,000Operations4.Contact Erosion Limit3mm5.Shelf Life30Years