ngt calculation

CALCULATION FOR NEUTRAL GROUNDING TRANSFORMER PROJECT : 11KV, 40MW CONDENSING TYPE TURBO GENERATOR Generator MW Rating 57 ** Generator KV Rating 11 ** Generator Capacitance/Ph (U(Micro Farad) 0.286 ** Connected Capacitance(assumed)/Ph (Micro Farad) 0.0572 ** Connected Capacitance(assumed)/Ph (Micro Farad) 0.006 ** Net Capacitance/Ph 0.3492 LAPT Capacitance/Ph (Micro Farad) 0.3 ** Total Capacitance (Micro Farad) 0.6492 3 X Capacitance 1.9476 Xc 1634.37 Capacitor Current/Amps 3.885811 Field Forcing Allowance 5.828717 NGT Vk (KV) 11 ** Insulation (KV) 11 ** NGT KVA 64.11588 Rounded off KVA 65 Equ. Primary Resistance 1634.37 Secondary Voltage Selected 240 ** Secondary Resistance 0.778014 Trafo. Resistance (assumed)/Ohms 0.05708 0.720934 Current Rating/Amps 90160.81 I 300.2679 Rounded Off Current Rating 301 NGA Rating : 65 KVA For 30sec NGR Rating (LR): 0.720934 +/_ 10% Ohms ** values to be entered External Resistance/Ohms(Total Res. - Tr. Resistance

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Sheet1CALCULATION FOR NEUTRAL GROUNDING TRANSFORMERPROJECT : 11KV, 40MW CONDENSING TYPE TURBO GENERATOR Generator MW Rating57**Generator KV Rating11**Generator Capacitance/Ph (U(Micro Farad)0.286**Connected Capacitance(assumed)/Ph (Micro Farad)0.0572**Connected Capacitance(assumed)/Ph (Micro Farad)0.006**Net Capacitance/Ph 0.3492LAPT Capacitance/Ph (Micro Farad)0.3**Total Capacitance (Micro Farad)0.64923 X Capacitance1.9476Xc1634.3699228989Capacitor Current/Amps3.885811206Field Forcing Allowance (a)5.8287168089NGT Vk (KV) (b)11**Insulation (KV) (Vp)11**NGT KVA (a x b)64.1158848984Rounded off KVA65Equ. Primary Resistance ( c )1634.3699228989Secondary Voltage Selected (Vs)240**Secondary Resistance c x ( Vs/Vp) Sq.0.7780141121Trafo. Resistance (assumed)/Ohms0.05708External Resistance/Ohms(Total Res. - Tr.Resistance) Rs0.7209341121Current Rating/Amps KVA/Rs = Isq =90160.805145535I =300.2678889684Rounded Off Current Rating301NGA Rating :65KVAFor 30secNGR Rating (LR):0.7209341121 +/_ 10%Ohms** values to be entered

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Ngt Advt En090812

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