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Consider the following statements regarding the fault analysis
The neutral grounding impedance Zn appears as 3Zn in zero sequence equivalent circuit
For faults on transmission lines, 3-phase fault is the least severe among other faults
The positive and negative sequence networks are not affected by method of neutral grounding
Which of the statements given above are correct ?
2 and 3
1 and 2
1 and 3
1, 2 and 3