Zone 1 Zone 2 T1 T2 Line 1 100MVA Yz Y+ Yz Yz ww Vrated 20kV G Z+=30+j95 ohms X"X" 20.0% X"0 = 6.0% ZO 80+j225 ohms 125MVA 75 MVA 20kV/230kV %IX = 7.0 230kV/44kV %IX = 6.0 Zone 3 Line 2 ww Z+22+ j57 ohms ZO 66+j205 ohms

Assume that for Line 1 and Line 2, Z- = Z+.

Assume that for T1 & T2, Z+ = Z- = Z0 = specified value.

Use an Sbase value of 100MVA. Use the transformer rated nameplate voltages as the base voltage in each zone.

Assume that the generator is operating at 19.0kV∠0.

Answer using digits only, e.g. 20,000, not 20kV. Do not include units. Do not include "j" for imaginary values.

1. What is the adjusted per unit negative sequence impedance of T1 ?

    

   Integer, decimal, or E notation allowed

   Question 2

   What is the magnitude of the zero sequence per unit impedance of Line 1 ?

    

    

   Integer, decimal, or E notation allowed

   Question 3

   What is the adjusted positive sequence per unit impedance of T2 ?

    

   Integer, decimal, or E notation allowed

   Question 4

   What is the magnitude of the negative sequence per unit impedance of Line 2 ?

   Integer, decimal, or E notation allowed

   Question 5

   What is the magnitude of the power system fault current at the generator for a three phase fault at the end of Line 2 ?
    

   Integer, decimal, or E notation allowed

   Question 6

   What is the magnitude of the power system fault current at the point of the fault for a three phase fault at the end of Line 2 ?

   Integer, decimal, or E notation allowed

   Question 7

   What is the magnitude of the power system current at the point of the fault for a line to ground fault at the high voltage terminal of T2 ?
    

   Integer, decimal, or E notation allowed

   Question 8

   What is the magnitude of the power system B phase current at the point of the fault for a B phase to C phase fault at the HV terminal of T