Power Systems
The equation of area control error(ACE) is

 ACE = ΔPtie +1/ b.Δf
 ACE = ΔPtie - 1/b.Δf
 ACE = ΔPtie - b.Δf
 ACE = ΔPtie + b.Δf

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Power Systems
Which of the following statement is/are true?Zn

 both 1 and 2
 The neutral grounding impedance Zn appears as Zn in zero sequence equivalent circuit
 nether 1 nor 2
 The neutral grounding impedance Zn appears as 3Zn in zero sequence equivalent circuit

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