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normalized energy or normalized power.
(i) sin 2t + 3 cos 4t
Find the charge q(t) flowing through an element if the current is
i(t) = 3e
−t + 20 cos(15t − π
6
⁄ )uA
q(0) = 1uC
Show that, "Three unbalanced phasors of a 3- system can be resolved into three balanced system of phasors."
Show that the per unit impedance referred to the circuits connected by a transformer is same, if same base MVA is taken for both circuits and base KVs have ratio equal to the transformation ratio.
What is the significance of sub-transient reactance and transient reactance in short circuit studies?
A 25 MVA, 11 kV generators with is connected through a transmission line and a transformer to a bus that supplies three identical motors as shown in Figure. Each motor has on a base of 5 MVA, 6.6 kV. The three-phase rating of the step up transformer is 25 MVA, 11/66 kV with a leakage reactance of 10% and that of the step-down transformer is 25 MVA, 66/6.6 kV with a leakage reactance of 10 %. The bus voltage at the motor is 6.6 kV when a three-phase fault occurs at the point 'P'.
For the specified fault, calculate- (i) The sub-transient current in the fault, (ii) The sub-transient current in the breaker-B
For the 2nd order system given Ts =7 sec and Tp= 3 sec find the value of % OS and location of poles.
