Page: 1 Electrical Transient Analyzer Program Short Circuit Analysis ANSI Standard 3-Phase Fault Currents Number of Buses: Swing Generator Load Total 1 0 4 5 Number of Branches: XFMR2 XFMR3 Reactor Line/Cable Impedance Tie PD 2 0 0 2 0 0 Total 4 Number of Machines: Synchronous Power Synchronous Induction Generator Grid Motor Machines Lumped Load 2 0 0 0 0 Total 2 System Frequency: Unit System: Project Output 60 Hz English C:\ETAP 400\PowerStation\\Untitled.SA1
Page: 2 BUS Input Data Bus Initial Voltage Generation Motor Load Type Nom. kv Base kv %Mag. Ang. MW Mvar MW Mvar Bus1 SWNG 11.000 11.000 100.0 0.0 Bus2 Load 33.000 33.000 100.0 0.0 Bus3 Load 33.000 33.000 100.0 0.0 Bus4 Load 6.600 6.600 100.0 0.0 Bus5 Load 6.600 6.600 100.0 0.0 5 Buses Total 0.000 All voltages reported by PowerStation are in % of bus Nominal kv. Base kv values of buses are calculated and used internally by PowerStation.
Page: 3 LINE/CABLE Input Data Line/Cable Ohms / 1000 ft per Conductor (Cable) or per Phase (Line) Library Size Length(ft) #/Phase T ( C) R X Y Cable1 98400.0 1 75 0.08232 0.10976 0.0000000 Cable2 9840.0 1 75 0.04116 0.02439 0.0000000 Line / Cable resistances are listed at the specified temperatures.
Page: 4 2-WINDING TRANSFORMER Input Data Transformer Rating Z Variation % Tap Setting MVA Prim. kv Sec. kv % Z X/R + 5% - 5% % Tol. Prim. Sec. Adjusted Phase Shift T1 10.000 11.000 33.000 10.000 15.5 0 0 0 0 0 10.0000 Std Pos. Seq. 0.0 T2 5.000 33.000 6.600 8.000 12.1 0 0 0 0 0 8.0000 Std Pos. Seq. 0.0 % Z Type Angle
Page: 5 BRANCH CONNECTIONS CKT/Branch Connected Bus % Impedance, Pos. Seq., 100 MVAb Type From Bus To Bus R X Z T1 2W XFMR Bus1 Bus2 6.44 99.79 100.00 T2 2W XFMR Bus3 Bus4 13.14 159.46 160.00 Cable1 Cable Bus2 Bus3 74.38 99.17 123.97 Cable2 Cable Bus4 Bus5 92.98 55.10 108.07 Y
Page: 6 SYNCHRONOUS GENERATOR Input Data % Impedance Generator Connected Bus Rating X/R Ratio Machine Base Type MVA kv RPM X"/R X'/R R X" X' Gen1 Turbo Bus1 10.000 11.000 1800 48.00 48.00 0.250 12.00 23.00 Gen2 Turbo Bus1 10.000 11.000 1800 48.00 48.00 0.250 12.00 23.00 Total Connected Synchronous Generators ( = 2 ): 20.000 MVA
Page: 7 SHORT - CIRCUIT REPORT 3-phase fault at bus: Bus5 Nominal kv = 6.600 Prefault Voltage = 100.00 % of nominal bus kv Base kv = 6.600 = 100.00 % of base kv Contribution 1/2 Cycle 1.5 to 4 cycle From Bus To Bus % V ka ka Imag. ka Symm. % V ka ka Imag. ka Symm. From Bus Real Imaginary /Real Magnitude From Bus Real Imaginary /Real Magnitude Bus5 Total 0.00 0.634-1.595 2.5 1.717 0.00 0.634-1.595 2.5 1.717 Bus4 Bus5 21.21 0.634-1.595 2.5 1.717 21.21 0.634-1.595 2.5 1.717 NACD Ratio = 1.00 # Indicates a fault current contribution from a three-winding transformer * Indicates a fault current through a tie circuit breaker
Page: 8 MOMENTARY DUTY Summary Report 3-Phase Fault Currents: (Prefault Voltage = 100 % of the Bus Nominal Voltage) Bus Device Momentary Duty Device Capability kv Type Symm. X/R Asymm. Asymm. Symm. Asymm. Asymm. ka rms Ratio M.F. ka rms ka Crest ka rms ka rms ka Crest Bus5 6.600 Bus5 Bus 1.717 2.5 1.079 1.853 3.125 Method: IEEE - X/R is calculated from separate R & X networks. HV CB interrupting capability is adjusted based on Bus nominal voltage Protective device duty is calculated based on total fault current * Indicates a device with interrupting duty exceeding the device capability
Page: 9 INTERRUPTING DUTY Summary Report 3-Phase Fault Currents: (Prefault Voltage = 100 % of the Bus Nominal Voltage) Bus Device Interrupting Duty Device Capability Symm. X/R Adj. Sym. Test Rated kv Type ka rms Ratio M.F. ka rms kv PF Int. Bus5 6.600 1.717 2.5 Adjusted Int. Method: IEEE - X/R is calculated from separate R & X networks. HV CB interrupting capability is adjusted based on bus nominal voltage Protective device duty is calculated based on total fault current * Indicates a device with interrupting duty exceeding the device capability