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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
 
Does voltage and current can be seperated?   2
why generator is star connected ? Voltech 3
hi.. i am krishna. i've complide my diploma engg.in electrical.i applied many places for jobs.but i am always fear from written test.ican't get success in it. i think my basic engg. is weak..show me some idea please..!   5
what is ring system ? Sabic 3
What are RMU yard Safety Operating Procedures   2
What is the concept of voltage & current its relation?   5
what are the protection for DG set and why?   1
Why Alternator has 0.8 power factor? Bhel 2
what is the working difference b/w softstarter and Variable frequency drive ? Parle 6
What is delta stare switch? Samsung 1
what is kVA TATA 6
In 3phase supply Voltage will come around 370v then what will happen?(mean what will effect on electrical equipment like AC,UPS,Motors.)   1
 
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