SC Calculation (MVA Method) ETAP
- 2. PARAMETER Power Grid kV = 11 System Fault Level = 10 kA X/R = 15 Transformator 11/0,42 kV 2 MVA %Z = 8 Generator kV = 0,42 2 MVA Xd” = 16 % Motor kV = 0,42 1 MVA Xd” = 15 % Impedance R + jX = 0,4 + j0,5 ohm
- 3. PARAMETER
- 4. PARAMETER
- 5. PARAMETER
- 6. PARAMETER
- 7. PARAMETER
- 8. PARAMETER
- 9. PARAMETER
- 10. PARAMETER
- 11. PARAMETER
- 12. CALCULATION *MVAsc Power Grid MVAsc = 3 x kV x Fault Level = 3 x 11 x 10 = 190,52 MVA *MVAsc Impedance MVAsc = 𝑘𝑉² 𝑍 z = 𝑅² + 𝑋² = 11² 0,6403 = 0,4² + 0,5² = 188,97 MVA = 0,6403 *MVAsc Transformer MVAsc = 𝑀𝑉𝐴 𝑧 = 2 0,08 = 25 MVA
- 13. CALCULATION *MVAsc Generator MVAsc = 𝑀𝑉𝐴 𝑋𝑑" = 2 0,16 = 12,5 MVA *MVAsc Motor MVAsc = 𝑀𝑉𝐴 𝑋𝑑" = 1 0,15 = 6,66 MVA
- 14. CALCULATION *MVAsc Z1-T1 dan Z2-T2 MVAsc = 1 1 𝑀𝑉𝐴 𝑍1 + 1 𝑀𝑉𝐴 𝑇1 = 1 1 188,97 + 1 25 = 22,079 MVA MVAsc Z2-T2 = MVAsc Z1-T1 = 22,079 MVA Equivalent Z2-T2 dan Z1-T1 = 22,079 + 22,079 = 44,159 MVA
- 15. CALCULATION *MVAsc Generator dan Motor MVAsc = MVAsc Generator + MVAsc Motor = 12,5 + 6,66 = 19,16 MVA *MVAsc on Bus 4 MVAsc = 1 1 190,52 + 1 44,159 + 19,16 = 55,02 MVA *Fault kA on Bus 4 Fault kA = 𝑀𝑉𝐴𝑠𝑐 𝐵𝑢𝑠 4 3 𝑥 𝑘𝑉 = 55,02 3 𝑥 0,42 = 75,63 kA
- 17. SIMULATION 6
- 18. SIMULATION
- 19. ETAP RESULT HAND CALCULATION (USING MVA METHOD) 76 kA @Bus 4 75,63 kA @Bus 4 RESULT