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single phase 50 hz, generator supplies an inductive load of 5 MW at a power factor of 0.8 lagging using OHTL over 20 km. The resistance and reactance are 0.39Ω and 3.96 Ω. The voltage at receiving station is maintained at 10 KV. The sending end voltage is ______
a Explanation: Current, I = 5000/(10*0.8) =625 A Vs = |Vr|+|I|*(RcosФr + XsinФr) = 10000+625(0.39*0.8+3.96*0.6) = 11.68kV.
a
See lessExplanation: Current, I = 5000/(10*0.8)
=625 A
Vs = |Vr|+|I|*(RcosФr + XsinФr)
= 10000+625(0.39*0.8+3.96*0.6)
= 11.68kV.
The charging current of a 400 kV is _____ that of 220 kV line of the same length
a Explanation: Line charging current is proportional to voltage.
a
See lessExplanation: Line charging current is proportional to voltage.
Xa is the armature reactance of a synchronous machine and Xl is the leakage reactance of the same machine, then the synchronous reactance is ____________
a Explanation: Xs = Xa+Xl
a
See lessExplanation: Xs = Xa+Xl
The per unit value of any quantity is usually given by _____________
a Explanation: The per unit value is given as (The actual value in any units)/(The base base value in same in same units).
a
See lessExplanation: The per unit value is given as (The actual value in any units)/(The base
base value in same in same units).
If the diameter of the conductor is increased then _____________
a Explanation: Inductance will increase.
a
See lessExplanation: Inductance will increase.
The per unit value of any quantity is usually given by ___________
a Explanation: The per unit value is given as (The actual value in any units)/(The base base value in same in same units).
a
See lessExplanation: The per unit value is given as (The actual value in any units)/(The base
base value in same in same units).
f the diameter of the conductor is increased then _____________
a Explanation: Inductance will increase
a
See lessExplanation: Inductance will increase
Apart from the skin effect the phenomena which cause/s the non uniform distribution of the current is ___________
a Explanation: Only the proximity effect and skin effect cause the non uniform distribution of the current.
a
See lessExplanation: Only the proximity effect and skin effect cause the non uniform distribution
of the current.
The fictitious resistance, “ r’ ” implemented in the conductors for the calculation of the inductance is _____________
a Explanation: It is 0.7788r in the equivalent network configuration.
a
See lessExplanation: It is 0.7788r in the equivalent network configuration.
Over the length of one transposition cycle of a power line, the total flux linkages of a nearby telephone line are zero for the balanced three phase currents
a Explanation: Its valid only with balanced systems.
a
See lessExplanation: Its valid only with balanced systems.