Answer / ravi

Impedance voltage of a transformer is the voltage required
to

short circuit the secondary winding terminals of the
transformer and apply voltage gradually from zero at
primary winding.increase the voltage gradullay till the
full load current flows in the secondary.The voltage at
which full load current flows that voltage is the impedance
voltage of the transformer.This is required for short
circuit calculations.You can find on the transformer name
plate as Impedance voltage or percentage impedance.

Answer / shantanau mishra

This is the voltage required to drive full load current in a
winding of a transformer when the other winding is short
circuited.
for example if percentage impedance of a 33/11kv transformer
is 6%. it means that 33x6/100=1.98KV would be required to
drive full load current in 33kv winding when 11kv winding is
short circuited.

Answer / md.abul basher

impedence voltage is that voltage which is applied through
primary side and full load current is flowing in secondary
side whwnever short Ckt. of secondary side

Answer / manoj kumar tiwari

The percentage impedance of a transformer is the volt drop
on full load due to the winding resistance and leakage
reactance expressed as a percentage of the rated voltage."

"It is also the percentage of the normal terminal voltage at
on side required to circulate full-load current under short
circuit conditions on other side."

The impedance of a transformer has a major effect on system
fault levels. It determines the maximum value of current
that will flow under fault conditions.

It is easy to calculate the maximum current that a
transformer can deliver under symmetrical fault conditions.
By way of example, consider a 2 MVA transformer with an
impedance of 5%. The maximum fault level available on the
secondary side is:

2 MVA x 100/5 = 40 MVA

and from this figure the equivalent primary and secondary
fault currents can be calculated.

A transformer with a lower impedance will lead to a higher
fault level (and vice versa).

The figure calculated above is a maximum. In practice, the
actual fault level will be reduced by the source impedance,
the impedance of cables and overhead lines between the
transformer and the fault, and the fault impedance itself.

Answer / madhu

Impedance voltage of a transformer is the voltage required

to

short circuit the secondary winding terminals of the
transformer and apply voltage gradually from zero at
primary winding.increase the voltage gradullay till the

full load current flows in the secondary.The voltage at

which full load current flows that voltage is the impedance

voltage of the transformer.This is required for short
circuit calculations.You can find on the transformer name

plate as Impedance voltage or percentage impedance

Answer / murali

can you say the formula for fine out short ckt current with
using impedance voltage

Answer / naufal

Simply it is the percentage of the normal terminal voltage
required to circulate full-load current under short circuit
conditions, or can also be consider as the voltage drop of
the trafo..

Answer / aravind kumar

Impedance voltage is calculated with short-circuit
test.which is very low compared to rated voltage. Impedance
voltage is the voltage which circulates the rated currents
when one of the two windings is shorted.

Answer / gopal birla

Imedance voltage is the amount of voltage required on
primary side to produce rated current on secondry side of
transformer when secondry is short circuited.

Or
amount of voltage drop accros primary side when rated
current flows through it

Answer / hh

Simply,if 10% means voltage drop is 10% of open cct voltage
at full load.

I have lowered a submersible pump having 100 LPM discharge & 130 Mts. Head, 15 HP rating on borewell. After lowering 108 Meters, It is taking 39 amps & blowing the fuse. Can someone put light what is the cause behind it ?

1 Answers  

I have experienced electrical maintenance HT ,but I completed be ECE ....can I apply c license or not ???? Pls help me friend s...

0 Answers   Crew pvt ltd,

What are the functions of different Parts of Alternator?

2 Answers  

How to design power source say 5KW i/p :415v 3 ph, o/p 5KW constant, variable currnt and variable volatge 10-230v,

2 Answers  

calotropis is an example of the following phyllotaxy

1 Answers   APGenco,

Can Superposition theorem be applied to AC Circuits?Can Thevenin's Theorem be applied to AC Circuit too?

6 Answers   HCL, NPCIL, Shivam, Vast,

My meter CT is 200/5amps Then my electrical meter MF=???please suggest

2 Answers   KFC,

how i calculate the syncrones generator NGR resistance .if we have a 6mw generator line voltage of generator 11kv also line current 393.3 ampere.

0 Answers  

what happens when dc supply is given to the transformer?

3 Answers  

i am swathi, b.tech 4th year. In smps(switched mode power supply)we are using diodes,mosfets,igbts for controling of current. And my question is why we did not use thyristors(scr)? it is also act as a switch,then what is the drawback of scr as compared to above transisters> if we use the scr,then what is happening ? plz give reply as soon as possible bcoz i am doing project on smps. plz frnds i want ans for that. if anybody know the ans plz send to my e-mail id /swathi.tadakapally@gmail.com/

5 Answers   EEE, TCS,

what is inrush current in transformer?

17 Answers   Bhel, Essar, GMR,

sir,i am swati. i am goin to gv jspl exam on 21st nov'10. iwant previous year question paper. plz help me out. my emailid is swatisinha.dav@gmail.com

1 Answers