Positive and Zero Sequence impedance for Line

       132kV Substation-B is being feed by 132kV single circuit radial line A-B having line length  ?? km. Line +Ve sequence impedance is 0.16+J0.40 ohms/km. Source Substation-A has 132kV Bus 3-Ph fault level as ???? MVA. Its 1-Ph fault level is ???? MVA. Find out the Substation-B 132kV Bus fault current for 1-Ph to ground fault (SLG).

(Note: Consider line zero sequence impedance as 3 times +Ve sequence impedance; and Base MVA as 100).

1) 3-Ph Fault MVA = BaseMVAx100/X1S; Thus: X1S=    %

2) As 1-Ph Fault MVA = 3xBaseMVAx100/(X1S+X2S+X0S);

Source Substation-A X1S+X2S+X0S =   %

3) As X1S = X2S and from 1 and 2 we can have X0S =   %

4a) For ?? km line ohmic reactance =   Ohms

4b) and its +Ve Seq. % reactance =   %

5) For Line X0L =  %

6a) Equivalent sequence impedance will be X1 = X1S + X1L =  %

6b) X2 = X2S + X2L =  %

6c) X0 = X0S + X0L =  %

7) X1 + X2 + X0 =    %.

8) Thus for Substation-B SLG Fault MVA =   MVA.

9) Substation-B SLG Fault Current =   AMP.

Topic FLTCALC Ex-4 Your score is:

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