Power System Analysis Lecture Notes Ppt -

[ L = 2\times 10^-7 \ln \left( \fracDr' \right) \ \textH/m ] where ( r' = r \cdot e^-1/4 ) (geometric mean radius, GMR).

Derived bases: [ I_base = \fracS_base\sqrt3 V_base, \quad Z_base = \frac(V_base)^2S_base ]

| Fault type | Connection at fault point | |------------|---------------------------| | Single line-to-ground (SLG) | Z1, Z2, Z0 in series | | Line-to-line (L-L) | Z1, Z2 in parallel | | Double line-to-ground (DLG) | Z1 in series with (Z2∥Z0) | power system analysis lecture notes ppt

[ Z_pu,new = Z_pu,old \times \left( \fracV_base,oldV_base,new \right)^2 \times \left( \fracS_base,newS_base,old \right) ]

Critical clearing angle ( \delta_c ) increases with higher inertia, faster fault clearing. 8. Conclusion & Summary Tables (PPT Final Module) Key formulas card: [ L = 2\times 10^-7 \ln \left( \fracDr'

Generator: 10 MVA, 11 kV, ( X_d'' = 0.12 ) pu. Transformer 10 MVA, 11/132 kV, ( X_t = 0.08 ) pu. Line impedance 20 Ω (on 132 kV). Fault at 132 kV bus. Find ( I_f ) in kA.

[ I_a1 = \fracV_fZ_1 + Z_2 + Z_0 + 3Z_f ] [ I_f = 3I_a1 ] Conclusion & Summary Tables (PPT Final Module) Key

Zero-sequence current cannot flow if transformer delta or ungrounded wye on source side. 7. Power System Stability (PPT Module 7) Definition: Ability to return to synchronous operation after a disturbance.

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