QUESTION ONE (a) A 3-phase line having an impedance of (5 + j20) ohm per phase delivers a load of 30 MW at a p.f., of 0.8 lag and voltage 33 kV. Determine the capacity of the phase modifier required to be installed at the receiving end if the voltage at the sending end is to be maintained at 33 kV. (b) Determine the tap ratio in problem (a) if the receiving end voltage is to be maintained at 0.92 p.u. of the sending end voltage. The line is fed through a 33/220 kV transformer. Assume tstr = 1.

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QUESTION ONE

(a) A 3-phase line having an impedance of (5 + j20) ohm per phase delivers a load of 30 MW

at a p.f., of 0.8 lag and voltage 33 kV. Determine the capacity of the phase modifier

required to be installed at the receiving end if the voltage at the sending end is to be

maintained at 33 kV.

(b) Determine the tap ratio in problem (a) if the receiving end voltage is to be maintained at

0.92 p.u. of the sending end voltage. The line is fed through a 33/220 kV transformer.

Assume ???? = 1.

QUESTION ONE
(a) A 3-phase line having an impedance of (5 + j20) ohm per phase delivers a load of 30 MW
at a p.f., of 0.8 lag and voltage 33 kV. Determine the capacity of the phase modifier
required to be installed at the receiving end if the voltage at the sending end is to be
maintained at 33 kV.
(b) Determine the tap ratio in problem (a) if the receiving end voltage is to be maintained at
0.92 p.u. of the sending end voltage. The line is fed through a 33/220 kV transformer.
Assume tęt₁ = 1.
Transcribed Image Text:QUESTION ONE (a) A 3-phase line having an impedance of (5 + j20) ohm per phase delivers a load of 30 MW at a p.f., of 0.8 lag and voltage 33 kV. Determine the capacity of the phase modifier required to be installed at the receiving end if the voltage at the sending end is to be maintained at 33 kV. (b) Determine the tap ratio in problem (a) if the receiving end voltage is to be maintained at 0.92 p.u. of the sending end voltage. The line is fed through a 33/220 kV transformer. Assume tęt₁ = 1.
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