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Question
3. What is Impedance Voltage in Transformer?
 Question Submitted By :: Electrical-Engineering
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
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.
 
Is This Answer Correct ?    167 Yes 11 No
Ravi
 
Answer
# 2
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
 
Is This Answer Correct ?    72 Yes 8 No
Md.abul Basher
 
 
 
Answer
# 3
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.
 
Is This Answer Correct ?    51 Yes 7 No
Shantanau Mishra
 
Answer
# 4
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
 
Is This Answer Correct ?    15 Yes 1 No
Madhu
 
Answer
# 5
can you say the formula for fine out short ckt current with
using impedance voltage
 
Is This Answer Correct ?    18 Yes 8 No
Murali
 
Answer
# 6
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..
 
Is This Answer Correct ?    5 Yes 3 No
Naufal
 
Answer
# 7
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.
 
Is This Answer Correct ?    2 Yes 0 No
Manoj Kumar Tiwari
 
Answer
# 8
Simply,if 10% means voltage drop is 10% of open cct voltage
at full load.
 
Is This Answer Correct ?    1 Yes 0 No
Hh
 
Answer
# 9
it is % of rated primary voltage which require to establish
sufficient flux to produce full load current in short
circuited secondary, it is used while load loss test on
transformer.
 
Is This Answer Correct ?    1 Yes 0 No
Sanjay Sharma
 
Answer
# 10
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.
 
Is This Answer Correct ?    0 Yes 0 No
Aravind Kumar
 

 
 
 
Other Electrical Engineering Interview Questions
 
  Question Asked @ Answers
 
what happens in a genarator when rotor supplied with ac instead of dc   3
why do we require two lines one phase and a neutral for an ac transmission..is neutral potential zero..?if yes y carry a neutral line from generating station itself...why dont we take it from ground   1
What are series and parallel isolators?   3
we hav seen in electric engine of trains only 1 wired slidng conecctn is there frm ovrhead line,howevr to complete a ckt in dc postv n negtv two conection has to b there...so where is tht negative is been connectd or where it is grounded...? ABB 5
What happen while we measure the Current in Rotor?   1
What are the Application of CT & PT ?   2
can we apply kirchhoff's laws to circuits containing non linear elements? Metro 2
what are the different functions of mccb, rccb / elccb ?   2
what is the problem in manufacturing transformer with 0 degree phase displacement.???why alwasys go for DYn11 or DY5?Whys not DY0 i.e zero degree displacement between primary and secondary side vectors? Bhel 3
how to converate kva to kw ?   4
what will hapen if secodery circuit is open of current transformer WHy neutral to ground trips when neutral touches the ground   1
WHAT IS A LINE CURRENT AND PHASE CURRENT   3
 
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