Shor Circuit Calculations

Solution: Equivalent 69kV system@ 100MVA :

T1 :

 800  I F (3 φ ) =  = 8 pu  100  1000  I F ( SLG ) =  = 10 pu   100  1 x1 = = 0.125 pu 8 3 x0 = − 2 × 0.125 = 0.05 pu 10

100  x = 0 .08 = 0.2667 pu   30  G1 : 100  x" = 0.10  = 0.40 pu   25  100  x0 = 0.06  = 0.24 pu   25  T2, T3, T3 : 100  x = 0 .06  = 0.80 pu   75  M1, M2 : kVAB = 0.9 × 5000 = 4500 or MVAB = 4.5

Short Circuit Calculations IIEE Presentation

100  x = 0 .15 = 3 .3333 pu   4.5 