Ans- The volume of copper required in case of three wire two phase ac systems
is 1.457 cos2φ times to that of two wired dc system
2. How
are the voltage and frequency controlled in automatic generation control system?
Ans – By controlling Turbine speed for voltage and by controlling excitation
for frequency, voltage and frequency are controlled in automatic generation
control system
3. What
will be the penalty factor for a unit, if the generating station is located
very close to load center?
Ans – The penalty factor will be almost equal to unity, if the
generating station is located very close to load center
incremental
fuel rate curve
5. With
high speed circuit breakers, which stability is increased?
Ans – With the use of high speed circuit breakers “transient stability” increases.
6. What
is thing, which is related to the critical clearing time of a fault in a power
system?
Ans - Transient stability limit is related to the critical clearing time
of a fault.
7. Which
parameter cannot be determined from equal area criterion?
Ans - Critical clearing time cannot be determined from equal area
criterion.
8. Name
the common assumptions made for the equal area criterion?
Ans – following are the common
assumptions made for the equal area criterion
i.
The transmission line and machine resistances
are neglected
ii.
Rotor speed of the machine is constant
iii.
Mechanical input remains constant
9. For
which parameter in power system the equal area criterion of stability is used?
Ans – Equal area criterion of stability
is used for one machine and infinite bus
bar
10. What
information do we get from the equal area criterion?
Ans – The information that we get
from equal area criterion is “Absolute
stability”
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