Question

1. What is the value of zero sequence impedance in line to line faults?
a. Zo = 1
b. Zo = 0
c. Zo = 3 Zn
d. Zo = 0

Answer 1

Answer:

option b and d

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Answer 2

The value of zero sequence impedance in line to line faults = Z0 = 0

• The zero-sequence impedance is usually measured for all star-connected windings of the transformer.
• The measurement is carried out by supplying a current of rated frequency between the parallel-connected phase terminals and the neutral terminal.
• The zero-sequence impedance per phase is three times the impedance measured in this way.
• The zero-sequence is needed for earth-fault protection and earth-fault current calculations.