what is percentage impedance of transformer? explain its
significance
- 2 Answers
- 16369 Views
- ABC, Bosch, I also Faced
- E-Mail Answers
Answer Posted / raul
percentage or per unit impedance = (Acutal impedance of the
transformer) divided by Base impedance .
1) The percentage impedance basically defines the short
circuit capability of the transformer bcoz short circuit
current is inversely proportional to the p.u impedance of
the system.
2) Secondly, it defines the voltage regulation of the
transformer bcoz max. voltage regulation is directly
proportional to the p.u impedance of the transformer.
So a high p.u impedance will reduce the short circuit level
and on the other it will result in poor voltage regualtion.
And a low p.u impedance will result in higher short circuit
level and good voltage regulation.
So the transformer are usually designed with a moderate p.u
impedance of say 5.75% to 8.75% to achieve both the low
short circuit level and good voltage regulation.
| Is This Answer Correct ? | 13 Yes | 2 No |
Post New Answer View All Answers
electromechanical relay type identification example : type=tjmh t-stants for j- m- h-
What are the reasons for the parallel operation of transformers?
How earthing/grounding done in aeroplanes and ships.
one electromagnet is called
What is an order of a system.
Why negative feedback is preferred in the control system?
How many energy meters can be connected on a 15VA Voltage transformer. please send a calculation sheet.
What is kvar?
advantages and disadvantages of inverse definite minimum time RELAY
how to calculate sizing of NGTR (Transformer rating,Loading resistor value and Current rating of resistor) and what is the X/R ratio. Details : 11kV,Capacitance 1.73532 micro farads,40kA for 1sec.
Why 11kv to be generated in generation station
What is the best thing to protect the motor from running over full current. CT or O/L or pressure transducer at the given pressure rating
I have a relay contact rated at 220v dc which is supplied with a 24vdc from the panel,for it to trip the dampers(24vdc).What if the application of the relay changes so that it should work at its rated 220vdc then will it work at 24vdc supply given or any other consideration needs to be taken .....
what is the difference b/w pvc cu conductor and cu breaded wire..?
how to produsing geretor power
