ALLInterview.com :: Home Page            
 Advertise your Business Here     
Browse  |   Placement Papers  |   Company  |   Code Snippets  |   Certifications  |   Visa Questions
Post Question  |   Post Answer  |   My Panel  |   Search  |   Articles  |   Topics  |   ERRORS new
   Refer this Site  Refer This Site to Your Friends  Site Map  Bookmark this Site  Set it as your HomePage  Contact Us     Login  |  Sign Up                      
Google
   
 
Categories >> Engineering >> Electrical Engineering
 
 


 

 
 Civil Engineering interview questions  Civil Engineering Interview Questions (3011)
 Mechanical Engineering interview questions  Mechanical Engineering Interview Questions (3270)
 Electrical Engineering interview questions  Electrical Engineering Interview Questions (13223)
 Electronics Communications interview questions  Electronics Communications Interview Questions (2348)
 Chemical Engineering interview questions  Chemical Engineering Interview Questions (407)
 Aeronautical Engineering interview questions  Aeronautical Engineering Interview Questions (76)
 Bio Engineering interview questions  Bio Engineering Interview Questions (16)
 Metallurgy interview questions  Metallurgy Interview Questions (79)
 Industrial Engineering interview questions  Industrial Engineering Interview Questions (162)
 Instrumentation interview questions  Instrumentation Interview Questions (2317)
 Automobile Engineering interview questions  Automobile Engineering Interview Questions (104)
 Mechatronics Engineering interview questions  Mechatronics Engineering Interview Questions (38)
 Marine Engineering interview questions  Marine Engineering Interview Questions (43)
 Power Plant Engineering interview questions  Power Plant Engineering Interview Questions (73)
 Engineering AllOther interview questions  Engineering AllOther Interview Questions (1189)
Question
WHAT HAPPEN WHEN CT SECONDARY OPEN DURING LOAD
 Question Submitted By :: Vthevar
I also faced this Question!!     Rank Answer Posted By  
 
  Re: WHAT HAPPEN WHEN CT SECONDARY OPEN DURING LOAD
Answer
# 1
its blast 
Is This Answer Correct ?    16 Yes 10 No
Venkat
 
  Re: WHAT HAPPEN WHEN CT SECONDARY OPEN DURING LOAD
Answer
# 2
If the CT secondary open during load than the voltage across
the secondary reaches to a high value i.e some kilowatts and
the secondary current becomes zero hence reduced back emf.
The working flux increases and core gets saturated. The
secondary e.m.f increases due to increased flux

Due to the above reason the primary gets overheated and core
also gets heated and its dangerous for person working on
secondary
 
Is This Answer Correct ?    48 Yes 10 No
Ashish S. Hans
 
 
 
  Re: WHAT HAPPEN WHEN CT SECONDARY OPEN DURING LOAD
Answer
# 3
There are two types of Cts
1.ACCT
2.DCCT
In ACCT if secondary is open during load it will damage the
CT due to high current ratio.
2,In DCCT the secondary is Equipmentload,ie,Bus bar
 
Is This Answer Correct ?    1 Yes 10 No
Dinesh Kumar
 
  Re: WHAT HAPPEN WHEN CT SECONDARY OPEN DURING LOAD
Answer
# 4
ct almost act like a step up transformer in which avery
high voltage is induce in the secondary open ckt
1.which is dangerious to the person working over there
2.ct goes to saturation at this stage.
 
Is This Answer Correct ?    12 Yes 10 No
Ravi_myla
[Seimens]
 
  Re: WHAT HAPPEN WHEN CT SECONDARY OPEN DURING LOAD
Answer
# 5
ct is a controling device for both the primary and
secondary,if secondary opened means the current ratio will
be losed and also equipment connected in the secondary side
will be sever damaged.
 
Is This Answer Correct ?    1 Yes 13 No
Vinothbhabu.k
 
  Re: WHAT HAPPEN WHEN CT SECONDARY OPEN DURING LOAD
Answer
# 6
CT means current transformer which help us to measure the
large amount of current by step down the value of current
to low value. CT primary wdg handle the large amount of
current due to which large amount of heat is produce at
primary winding so we use insulating oil which help to
provide insulation as well as provide cooling. If we open
its secondary winding, the secondary current will reduce to
zero, which cause increase in voltage across its secondary
open terminal and that leads to increase in primary
current, with increase in primary current temperature of
oil in CT also increase and oil start burn which leads to
blast in CT
 
Is This Answer Correct ?    28 Yes 4 No
Javed
 
  Re: WHAT HAPPEN WHEN CT SECONDARY OPEN DURING LOAD
Answer
# 7
if ct opens during heavy load , heavy voltage will appear
across ct secondary ,because of no oppossing emf present
primary.result ct will blast
 
Is This Answer Correct ?    3 Yes 8 No
V.selvakumar
 
  Re: WHAT HAPPEN WHEN CT SECONDARY OPEN DURING LOAD
Answer
# 8
the secondary of CT open means, as the transformer
secondary will atempt to continue driving current across
the effectively infinite impedence.
this will produce a high voltage across open secondary
(range of several KV in some cases)which may cause arcing.
 
Is This Answer Correct ?    5 Yes 3 No
Ravi Kimar.a
 
  Re: WHAT HAPPEN WHEN CT SECONDARY OPEN DURING LOAD
Answer
# 9
In normal power transformers primary current depnds upon
the secondary current ( load on secondary side, as load
increases its secondary current increases and also primary
current increases )
While in CT primary current is independent, if CT secondary
opens secondary current becomes zero while primary current
remains as it is. Both currents counter each other during
normal operation, and if secondary opens so secondary
current becomes zero and due to the primary current ( now
no counter effect present ) its core becomes saturated and
CT may blast.
 
Is This Answer Correct ?    5 Yes 2 No
Imran
 
  Re: WHAT HAPPEN WHEN CT SECONDARY OPEN DURING LOAD
Answer
# 10
Mr ravi siemens ..........CT doesnt step up ....it steps
down and its for metering ......u r lucky to b there in
siemens .....
 
Is This Answer Correct ?    6 Yes 9 No
Amir Sharif
 

 
 
 
Other Electrical Engineering Interview Questions
 
  Question Asked @ Answers
 
primary of transformer connected to Dc supply in series with switch, and secondary connected on ammeter, what happens when swith On and OFF. (or) if continuously On and OFF   9
Why substation battery room is coulered black?   1
Why transformer neutral earthing? What is advantages?   4
HOW TO CALCULATE UPS BATTERY BACKUP TIME HSBC 3
Im designing APFCR Panel for 600 KVAR.I need to calculate the full current so that i can choose the capacity of isolator/Breaker.Kindly suggest with formula.   1
what is the difference SCR & TRIAC? Tcs 9
i asked a funny question in Electrical ohms law V=IR in const temp voltage is directly proportional to current Power p=VI cos@ in that formula Voltage is indirectly proportional to current Try to give me the fact what is happening in Electrical.. contact Thanigai_1984@yahoo.co.in   3
What is RTCC panel and why it is required   21
What is the allowalable frequency variation in India and in US? Why there is the difference?   1
length of 4 core cable 95mm from substation LV VFD panel to Motor at field approximately 150 meter. Motor stop and power has been isolated from LV MCC ( Substation )to disconnect Motor for services. After Motor completed service propose to reinstall and reconnect Motor Cable, found earth cable sparkling during touching at metal / motor body. Inspect by clamp meter found earth cable have current flow AC 1-2amps and all earth cable at MCC LV also have current flow as same value. why it is happen?   2
What is Vk and Imag i.e Knee point voltage & Magnetising Current? How to calculate above values? How to define accuracy class 5P10? Deccan-Cements 5
How we calculate the size of H.T cable for any transformer & rating of busbar for any L.T. panel?   3
 
For more Electrical Engineering Interview Questions Click Here 
 
 
 
 
 


   
Copyright Policy  |  Terms of Service  |  Articles  |  Site Map  |  RSS Site Map  |  Contact Us
   
Copyright 2013  ALLInterview.com.  All Rights Reserved.

ALLInterview.com   ::  KalAajKal.com