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Question
how to improve IR value in HT motors?
 Question Submitted By :: Electrical-Engineering
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
It is not possible to improve IR value as insulation can not
be injected.You can remove the water contents by heating the
coils by making full load current pass through ,using 3
phase dimmer-stat with rotor locked.
 
Is This Answer Correct ?    9 Yes 0 No
K.prakashchandra
 
Answer
# 2
insulation resistance is measured using megger.if megger shows
meaurable value in tens or hundereds then just change the insulatin of lt motor to improve it.
 
Is This Answer Correct ?    6 Yes 3 No
Prem
 
 
 
Answer
# 3
With dimmer-stat (auto-transformer),it may not be possible
to get full load current in large motors .Then you have to
use strip heaters for heating the coils or DC supply (no
back emf)
 
Is This Answer Correct ?    1 Yes 1 No
K.prakashchandra
 

 
 
 
Other Electrical Engineering Interview Questions
 
  Question Asked @ Answers
 
what is the load amp of a 2 hp single phase motor?   6
are induction motor have poles? yes / no , why?   3
WHY HOLDING CONTACTOR OF MOTOR STARTER IS CALLED NO VOLT COIL.   3
Why P.F(power factor)relay should not be connected to the D.G(diesel generator) incomer side ABB 1
Why the Transformer connection is changing in different transformer?(Like Star & Delta,Delta & Delta,Star & Star,Delta Star) From that connection where it is used?   2
what are the effects on an power plant and consumers if the power factor is increased or decreased?   2
What is the different type of class in CTS and why it is required   2
What is the actual meaning between the energy conservation and energy saving ?   3
If we feed 230V ac supply to a full wave rectifare, what & how much will be the out put voltage?   3
What are the usege & different between UPS & batteries with charging system in in Substation?( UPS 120V AC & battery charger is 120v DC)   1
How much area is covered by a single lightning arrestor to protect object from lightning strokes ?   1
my field of interest is T&D. plz tell something about that. TCS 15
 
For more Electrical Engineering Interview Questions Click Here 
 
 
 
 
 


   
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