Power Systems
The positive (Z1), negative (Z2) and zero sequence (Z0) impedances of a transmission line follows the relation

 Z1 = Z2 = Z0
 any of the above
 (Z1 = Z2) < Z0
 (Z1 = Z2) > Z0

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Power Systems
Which of the following statements is/are true? The elements of each row of a Y bus matrix for load flow studies in power system add up to zero

 if both 2 and 3 are satisfied
 always
 if the shunt admittances at the buses are ignored
 if the mutual couplings between transmission lines are absent

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