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Q:2) a) If this uunit in question 1 is initially operating at

Pmp.u=Pep.u=0.7 per unit w = wsyn

and d=12 degree when fault reduces the generator electrical power output by

70%.Determine the angle d five cycles after the fault commences. Assume that

the accelerating power remains constant during fault. Also assume that Wp.u(t)=

1.0 in the swing equation. B)Repeat part A)for a bolted three- phase fault at

the generator terminals that reduces the electrical power output to zero. Compare

the angle with that determined in part A.

Q:3

A 60Hz synchronous generator has a transient reactance of

0.2 per unit and an inertia of 5.66MJ/MVA. The generator is connected to an

infinite bus through a transformer and a double circuit transmission line. Resistances

are neglected and reactances are expressed on a common MVA base and are marked

on a diagram. The generator is delivering a real power of0.77 per unit to bus 1.Voltage magnitude at

bus 1 is 1.1. The infinite bus voltage is V=1.0 p.u. Determine the generator

excitation voltage and obtain the swing equation in the form of ;Hd2f0dt2=

Pm-PmaxsinThe machine of question 2 is

delivering a real power input of 0.77 per unit to the infinite bus at a voltage

of 1.0 p.u. The generator excitation voltage is E=1.25 p.u.A)A

temporary three phase fault occurs at the sending end of one of the

transmission lines. When the fault is cleared both lines are intact. Using

qual area criterion determine the critical clearing angle and the critical

fault clearing time.B)A

three phase fault occurs at the middle of one of the lines the fault is

cleared and the fault is isolated. Determine the critical clearing angle.

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