STUPIDSID
Answer the following questions:
1(a)
Discuss the role of ground wire in protection.
5 M
1(b)
Discuss the phenomenon of attenuation due to corona.
5 M
1(c)
Discuss the various factors to be considered while selecting a rating of a lightning arrestor.
5 M
1(d)
Discuss the power invariance in symmetrical components.
5 M
2(a)
Discuss the P-V and Q-V Nose Curves.
10 M
2(b)
An alternator and a synchronous motor each rated for 50 MVA, 13.2 KV having subtansient reactance of 20%, are connected through a transmission link of reactance 10%, on the base of machine ratings. The motor acts as a load of 30 MW, 0.8 PF lead and terminal voltage 12.5 KV, when a three phase fault takes place at the motor terminals. Determine the sub transient current in alternator, motor and fault.
10 M
3(a)
Discuss the maximum charge condition.
10 M
3(b)
A wave of 110 KV is travelling on a line of impedance 600ohms arrives at a junction with rwo lines of impedance of 800 and 200 ohms respectively. Find surge voltages and current transmitted into each branch of line.
10 M
4(a)
Determine the corona critical disruptive voltage, visual critical voltage, power loss in fair weather and bad weather condition for a 3 phase line 160 km long, with conductor diameter 1.036cm, 2.44m delta spacing, air temperature 26.67 centigrade, attitude 2440 m, corresponding to an approximate barometric pressure of 73.15 cm operating voltage II 0 KV at 50 HZ. Assume m=0.85, m, =0.72.
10 M
4(b)
Discuss the phase shift of symmetrical components in star delta transformer.
10 M
5(a)
Discuss Volt Time characteristics curve for insulation coordination.
10 M
5(b)
Write an algorithm for short circuit study of a system.
10 M
6(a)
Discuss the role of surge capacitor, surge reactor and surge absorber.
10 M
6(b)
Discuss the various causes of over voltages in power system.
10 M
7(a)
Draw a sequence network for double line to ground fault and line to line fault and write the fault current equation.
10 M
7(b)
The line to ground voltages on the high voltage side of a step up transformer are 100 KV, 33 KV, and 38 KV on phases a, band c respectively. The voltage of phase a leads that of phase b by 100 and legs that of phase c by 176.5. Determine analytically the symmetrical components of voltage.
10 M
More question papers from Power System Analysis