ETAP PowerStation. Electrical Transient Analyzer Program. ETAP PowerStation. Short Circuit Analysis. ANSI Standard 3-Phase Fault Currents

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1 Page: 1 Electrical Transient Analyzer Program Short Circuit Analysis ANSI Standard 3-Phase Fault Currents Number of Buses: Swing Generator Load Total Number of Branches: XFMR2 XFMR3 Reactor Line/Cable Impedance Tie PD Total 4 Number of Machines: Synchronous Power Synchronous Induction Generator Grid Motor Machines Lumped Load Total 2 System Frequency: Unit System: Project Output 60 Hz English C:\ETAP 400\PowerStation\\Untitled.SA1

2 Page: 2 BUS Input Data Bus Initial Voltage Generation Motor Load Type Nom. kv Base kv %Mag. Ang. MW Mvar MW Mvar Bus1 SWNG Bus2 Load Bus3 Load Bus4 Load Bus5 Load Buses Total All voltages reported by PowerStation are in % of bus Nominal kv. Base kv values of buses are calculated and used internally by PowerStation.

3 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 Cable Cable Line / Cable resistances are listed at the specified temperatures.

4 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 T Std Pos. Seq. 0.0 T Std Pos. Seq. 0.0 % Z Type Angle

5 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 Bus T2 2W XFMR Bus3 Bus Cable1 Cable Bus2 Bus Cable2 Cable Bus4 Bus Y

6 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 Bus Gen2 Turbo Bus Total Connected Synchronous Generators ( = 2 ): MVA

7 Page: 7 SHORT - CIRCUIT REPORT 3-phase fault at bus: Bus5 Nominal kv = Prefault Voltage = % of nominal bus kv Base kv = = % 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 Bus4 Bus NACD Ratio = 1.00 # Indicates a fault current contribution from a three-winding transformer * Indicates a fault current through a tie circuit breaker

8 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 Bus Bus5 Bus 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

9 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. Bus 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

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