Transformer Operation (B) Flashcards
The main component that restricts exciting current flow of a transformer operating under no-load condition is ?
Primary induced voltage
As the secondary current increases the Resultant Magnetic Flux will?
Decrease
What can you determine from a short circuit test ?
Copper losses and percent IZ
(Impedance voltage)
It is possible to calculate the percentage IZ of a transformer with a short circuit test ?
T or F
True
The core losses of a transformer are due to
The hysteresis losses and the eddy current losses
From No load to Full load conditions, the net magnetic flux in the core of the transformer will?
Stay almost the same
Voltages are induced into the windings of a transformer by the ?
Exciting flux
The Max secondary short-circuit current of a transformer is determined by the true power rating of the transformer, the voltage and the percent impedance voltage
T or F
False
The %IZ value can be used to determine the fault currents over current devices must be able to interrupt
T or F
True
As load is added to a transformer, the copper loss will:
Increase
Power lost in heat in the windings of a transformer due to the flow of current through the copper is known as:
Copper losses
With a lagging power factor type load added, a transformers secondary voltage will:
Decrease
As the load decreases on a transformer, the copper losses will:
Decrease
What is the impedance voltage of a transformer
The primary voltage required to circulate rated secondary current
Is it safe to remove paralleled transformers if only one is disconnected:
No!!!!
Could short circuit the transformer
