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Question
What is Residual Voltage & Residual Current?
 Question Submitted By :: Electrical-Engineering
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
Meaning of Residue:

A small amount of something that remains after the main
part has gone or been taken or used.

Now coming to technical understanding:

Residual voltage is the voltage that is remaining in form
of induced emf i.e., magnetic field in the windings of
generator or motor which will help in producing voltage in
generators and back emf in motors.

Residual current is the current which the sum of currents
in all the phases flowing towards and away from the node
must be zero, if it is not so the value which remains is
called residue so residual current.
I1+I2+I3+IN=0

To detect the residual current in power system RCCB & ELCB
are used.

RCCB= RESIDUAL CURRENT CIRCUIT BREAKER
ELCB= EARTH LEAKAGE CIRCUIT BREAKER.

My friend I think this information may help you.
If any correction is to be made please send the corrections
to my mail id: knownfellow7@yahoo.co.in
 
Is This Answer Correct ?    49 Yes 4 No
Vijay
 
Answer
# 2
Dear Friends,
I think, Residual voltage means the voltage that lefts in
the source of supply after removing the main cause of
production.
 
Is This Answer Correct ?    7 Yes 2 No
Amarendra Barad
 
 
 
Answer
# 3
This case arises only in series dc generator
current should be sent around the poles to magnetize.
this current can the source(generator).
current is passed through poles if it is loaded.
but if it is not loaded current is zero through the field.
load voltage should be zero actually.but this dont
happen.we us egenerator frequently.due to this poles are
partially magnetized this causes some voltage appear called
residual voltage.



i haven't heard about residual current
 
Is This Answer Correct ?    7 Yes 23 No
Rajesh
 

 
 
 
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