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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
 
Differenc between the resistance and resisters?   5
can any one tell me the formula to select the thickness of wire selection according to ampere rating   2
what is the speed of current   4
A 400KVA ,50HZ TRANSFORMER IS TO BE OPERATED AT 50HZ.THEN KVA RATING OF THE TRANSFORMER?. GATE 4
can we say current flows inside an atom as electron moves inside an atom? Vedanta 7
why always electric field is linked with magnetic field??? NTPC 2
What are the types of circuit breakers ? Genco 5
why neutral busbar size is half of the phase busbar size in control panels IBS 1
how motor should be connected i.e star-delta or star-star or delta-delta ?   3
what is meant by armature reaction?   13
what is the main differnce b/w simplex RTD and Duplex RTD?   3
Why Human body feel Electric shock ?? n in an Electric train during running , We didnt feel any Shock ? why NTPC 13
 
For more Electrical Engineering Interview Questions Click Here 
 
 
 
 
 


   
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