what is percentage impedance of transformer? explain its
significance
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
What types domain of laplace transforms? What behavior can laplace transform predict how the system work?
What are the functions of temperature scanner in power transformer?
Draw the vector diagramme for Asynchronous Induction Generator at noload,half load and fullload.
Determine a suitable number of slors and conductors per slot for the starter 1 winding of a 3 phase, 3300 V. SO Hz 300 rpm alternator. The diameter is 2.3 m
How many size of cable required for a 300m long and 30kw inductive lode
Is it possible to measure the voltage of a battery from a single terminal?
What is EMC filter in VVVF Drive ?
how desiel generate sart fail of eb?
What are the main advantages of generalized error co-efficients?
What are stable systems?
Why have to use copper cable for local isolator to motor ?
how to calculate cable size in diffrent loads?
What are the types of power in electrical power?
PAC and simple Ac different
how can i determine the KVA/MVA rating of transformer precisely?? is there any standard test?????