Golgappa.net | Golgappa.org | BagIndia.net | BodyIndia.Com | CabIndia.net | CarsBikes.net | CarsBikes.org | CashIndia.net | ConsumerIndia.net | CookingIndia.net | DataIndia.net | DealIndia.net | EmailIndia.net | FirstTablet.com | FirstTourist.com | ForsaleIndia.net | IndiaBody.Com | IndiaCab.net | IndiaCash.net | IndiaModel.net | KidForum.net | OfficeIndia.net | PaysIndia.com | RestaurantIndia.net | RestaurantsIndia.net | SaleForum.net | SellForum.net | SoldIndia.com | StarIndia.net | TomatoCab.com | TomatoCabs.com | TownIndia.com
Interested to Buy Any Domain ? << Click Here >> for more details...


What is the minimum setting in REF relay because i am
facing some problem whenever power resumes after power
failure my transformer is tripping because of REF trip. I
am using CSPC make numerical relay(DIP switches). Now
setting is 15 percentage. What is the reason for this
triping. I sm waiting for answer

Answers were Sorted based on User's Feedback



What is the minimum setting in REF relay because i am facing some problem whenever power resumes a..

Answer / k.prakashchandra

Increase the time delay

Is This Answer Correct ?    0 Yes 0 No

What is the minimum setting in REF relay because i am facing some problem whenever power resumes a..

Answer / k.prakashchandra

Your setting is 15% of In.While charging ,Tr draws initial
magnetizing current 6 to 15 times the In. Any difference in
measurements by CT s at this current ,may exceed the set
current.Even 1% error in measurement at normal current
becomes 15% of In at initial charging current at 15 times
the In

Is This Answer Correct ?    0 Yes 1 No

Post New Answer

More Electrical Engineering Interview Questions

How to calculate the slip ring induction motor rotor current and voltage.

1 Answers   Bhel,


I AM A ELECTRICAL PANEL BOARD DESIGN ENGINEER.IF I GO ANY INTERVIEW ,TECHNICALLY WHAT ARE QUESTIONS I WILL FACE FROM INTERVIEWER?

0 Answers   Bell,


Is there any difference of regulation of transformer, alternator , transmission line, if yes, what is it?

1 Answers  


what is meant by transformer oil temparature

3 Answers   Vijaya Bank,


Can someone help me in the Below Quest on Earthing 1.Types of Earthing and Recommended for what use 2.What is the Pit value /Panel N -E value should be or within limit for RP and UPS .

1 Answers  


why we avoid parallel operation of diesl generator?

4 Answers  


critically criticize the application of ring main unit in power system

0 Answers  


what does work of electrical technician in industrial

1 Answers  


Whether 3 phase induction motorwith 100 hp capacity , Amp 160 for which sensitive earth fault relay , type CTUM 15 can be used?

0 Answers   ONGC,


A 3-phase IM is supplied from 50 Hz system. It runs at speed of 1440 rpm and slip equal to 4 %. Calculate number of pole pairs. A 1 B 6 C 2 D 3

0 Answers  


hi Is there any possibilities to find out the rotation of a shaft or something else by using electromagnectic waves or by IR rays.If s then can v change the dir., of rotation of the same by remotely?& how? plz dn't any1 say "NO r CAN'T"

0 Answers  


How to calculate 5hp 415v 3phase 2800rpm Ac motor full load current with out tourgh

1 Answers   Siemens, Spatel,


Categories
  • Civil Engineering Interview Questions Civil Engineering (5086)
  • Mechanical Engineering Interview Questions Mechanical Engineering (4456)
  • Electrical Engineering Interview Questions Electrical Engineering (16639)
  • Electronics Communications Interview Questions Electronics Communications (3918)
  • Chemical Engineering Interview Questions Chemical Engineering (1095)
  • Aeronautical Engineering Interview Questions Aeronautical Engineering (239)
  • Bio Engineering Interview Questions Bio Engineering (96)
  • Metallurgy Interview Questions Metallurgy (361)
  • Industrial Engineering Interview Questions Industrial Engineering (259)
  • Instrumentation Interview Questions Instrumentation (3014)
  • Automobile Engineering Interview Questions Automobile Engineering (332)
  • Mechatronics Engineering Interview Questions Mechatronics Engineering (97)
  • Marine Engineering Interview Questions Marine Engineering (124)
  • Power Plant Engineering Interview Questions Power Plant Engineering (172)
  • Textile Engineering Interview Questions Textile Engineering (575)
  • Production Engineering Interview Questions Production Engineering (25)
  • Satellite Systems Engineering Interview Questions Satellite Systems Engineering (106)
  • Engineering AllOther Interview Questions Engineering AllOther (1379)