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613.

A three-phase alternator generating unbalanced voltages is connected to an unbalanced load through a 3-phase transmission line as shown in Fig. the neutral of the alternator and the star point of the load are solidly grounded. The phase voltages of the alternator are E_a =10∠0°V E_b = 10∠− 90°V,E_c = 10∠120°V. The positive sequence component of the load current is

[2 marks]
(a) 1.310∠-107°A
(b) 0.332∠-120°A
(c) 0.996∠-120°A
(d) 3.510∠-81°A

asked in Electrical Engineering, 2003

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614.

A generator delivers power of 1.0 p.u. to an infinite bus through a purely reactive network. The maximum power that could be delivered by the generator is 2.0 p.u. A three phase fault occurs at the terminals of the generator which reduces the generator output to zero. The fault is cleared after t_c second. The original network is then restored. The maximum swing of the rotor angle is found to be δ_max = 110 electrical degree. Then the rotor angle in electrical degrees at t = t_c is [2 marks]
(a) 55
(b) 70
(c) 69.14
(d) 72.4

asked in Electrical Engineering, 2003

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615.

A list of relays and the power system components protected by the relays are given in Group I and Group II respectively. Choose the correct match from the four choices given below:

Group I Group II

P. Distance relay 1. Transformers

Q. Under frequency relay 2. Turbines

R. Differential relay 3. Busbars

S. Buchholz relay 4. Shunt capacitors

5. Alternators

6. Transmission lines

[2 marks]
(a) P – 6, Q – 5, R – 3, S - 1
(b) P – 4, Q – 3, R – 2, S - 1
(c) P – 5, Q – 2, R – 1, S - 6
(d) P – 6, Q – 4, R – 5, S - 3

asked in Electrical Engineering, 2003

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