Follow Our FB Page << CircleMedia.in >> for Daily Laughter. We Post Funny, Viral, Comedy Videos, Memes, Vines...


For Synchronisation of DG Sets Sometimes we people use NIC
(Neutral Isolation Contactor) Instead of 4-pole ACB or any
switchgerar..Please guide me why is it so????

Answers were Sorted based on User's Feedback



For Synchronisation of DG Sets Sometimes we people use NIC (Neutral Isolation Contactor) Instead of..

Answer / srikanth shreenidhi

Whenever DGs are paralled & synchronised one should have a
common neutral.If neutral of one generator fails
automatically the neutral of other dg sets which is on a
common bus takes over.Whereas if the DG has a 4 pole
breaker and neutral fails it will be impossible for the
system to continue as all the dg sets will have a switched
neutral.
Secondly in case of neutral/contactor failure the user will
have to change only the contactor instead of the whole
breaker

However when only one DG set is used we always go with 4
pole breaker.

Is This Answer Correct ?    16 Yes 8 No

For Synchronisation of DG Sets Sometimes we people use NIC (Neutral Isolation Contactor) Instead of..

Answer / vinod

when a DG set is started and as dg voltage is building up it is necessary to connect the lowest potential point of generator first with the system which it is to be feed, that is the neutral as first. then the breaker can be closed if the set is required to be parallel first. the reason is the system which the DG is intended to supply may have a neutral potential which can be at a different potential other than the DG. so in order to establish a common neutral NIC is used. if NIC is not there and DG neutral is always solidly connected to the BUS then grounding impedance of the whole system is reduced and in turn fault in system can lead to a higher fault current.

Is This Answer Correct ?    9 Yes 1 No

For Synchronisation of DG Sets Sometimes we people use NIC (Neutral Isolation Contactor) Instead of..

Answer / muniraja1283@rediffmail.com

above said subject full very satisfactury

Is This Answer Correct ?    3 Yes 4 No

For Synchronisation of DG Sets Sometimes we people use NIC (Neutral Isolation Contactor) Instead of..

Answer / zuber ahamed

Whenever DGs are paralled & synchronised one should have a
common neutral.If neutral of one generator fails
automatically the neutral of other dg sets which is on a
common bus takes over.Whereas if the DG has a 4 pole
breaker and neutral fails it will be impossible for the
system to continue as all the dg sets will have a switched
neutral.
Secondly in case of neutral/contactor failure the user will
have to change only the contactor instead of the whole
breaker

However when only one DG set is used we always go with 4
pole breaker.

Is This Answer Correct ?    1 Yes 5 No

Post New Answer



More Electrical Engineering Interview Questions

Do I need a special Transformer to put 240 VAC 3 phase into it and and get 480 VAC 3 phase out of it to run a machine? Or, do I just use an ordinary step down transformer and step up the voltage? Thanks

2 Answers  


How can we deside Short Ckt level of electrical System,Breakers etc.please provide formula to find SC of HV side & LV side

0 Answers  


why DG neutral is earth?

4 Answers   HP,


Explain working of servo controlled voltage stabilizer.

3 Answers  


What happened If 3phase supply connected to slip ring side of slipring induction motor ?

2 Answers  






ow can i get certificate of competency as electrical supervisor and my diploma in electrical engineering from jalgaon.

0 Answers   ONGC,


what is the working difference b/w softstarter and Variable frequency drive ?

6 Answers   Parle,


How REF protects transformer alone? explain with diagram.

0 Answers  


What is the angle of inclination for the oil connection from transformer conservator to Bucholz relay and why?

0 Answers   Alam Group of Companies,


Whats the diference between Induction motor and servo motor

3 Answers   Essar, PMT Machines,


how we can calcultae the short circuit level for bus bar

0 Answers   Jaiprakash, Panorama Apparels,


why two fuses are used in battery charging room?one in positive line and the other in negative line?do any DC system require two fuses?

1 Answers   HPCL,






Categories
  • Civil Engineering Interview Questions Civil Engineering (5075)
  • Mechanical Engineering Interview Questions Mechanical Engineering (4444)
  • Electrical Engineering Interview Questions Electrical Engineering (16597)
  • Electronics Communications Interview Questions Electronics Communications (3915)
  • Chemical Engineering Interview Questions Chemical Engineering (1092)
  • Aeronautical Engineering Interview Questions Aeronautical Engineering (214)
  • Bio Engineering Interview Questions Bio Engineering (96)
  • Metallurgy Interview Questions Metallurgy (361)
  • Industrial Engineering Interview Questions Industrial Engineering (258)
  • Instrumentation Interview Questions Instrumentation (2987)
  • Automobile Engineering Interview Questions Automobile Engineering (332)
  • Mechatronics Engineering Interview Questions Mechatronics Engineering (97)
  • Marine Engineering Interview Questions Marine Engineering (123)
  • Power Plant Engineering Interview Questions Power Plant Engineering (170)
  • Textile Engineering Interview Questions Textile Engineering (575)
  • Production Engineering Interview Questions Production Engineering (0)
  • Satellite Systems Engineering Interview Questions Satellite Systems Engineering (106)
  • Engineering AllOther Interview Questions Engineering AllOther (1377)