what is restircted earth fault relay,how it works? what is
diffrance btwn normal earth falut relay & restricted earth
fault relay?
- 1 Answers
- 4766 Views
- I also Faced
- E-Mail Answers
Answer Posted / javad ahamad
both e/f relays are different. consider an alternator, its
neutral is earthed through a
resistance inorder to limit earth fault current .then we
cant protect the 100% winding from
differential e/f relay only.because if an e/f occurs at
very near to neutral point the driving
current to operate relay will be very small. there for it
cant be sensed by this method,
we can protect up to 80%(approximate value.depent upon
resistance)only.at this situation
we r providing a restrcted e/f relay to protect the
remaining winding ie 20%.this relay
have very low current setting.by the combination of these
two we can protect 100% winding.
| Is This Answer Correct ? | 6 Yes | 0 No |
Post New Answer View All Answers
if any house we instaled a 1.5 ton ac and its phase cable of wiring is installed but netrual cable of wiring not instaed. my question is that is neutual of house(for other wiring is capable for ac load or a sepeart neutrual wiring required
Advantage of LT panel vs HT panel
What is the relationship between voltage,current & frequency?
how we control automatic generator i'e with to supply (main supply and local generator) when the main supply was break to supply the local supply automatically to begin supplying power.I now this control circuit is the combination of contactor time delay contactor switch and overload relay .but my question is how we combine those component thank you
can I improve the furnace power factor (10 mva transformer) by adding a capacitor bank before the transformer.Does system power factor vary a lot with the furnace PF?
Why field rheostat is kept in minimum position while armature rheostat at maximum position?
I AM GOING TO ATTEND APTRANSCO ON 26TH OCT 08.PLEASE SEND ME ANY MATERIAL OR TYPE OF QUESTIONS OR EXP QUESTIONS.
hi frnds can any one help me ? plz send me placement paper of IOCL of Electrical streem .... plz send ....its urgent....
what is settable hystersis protection? If any body knows plz kindly post the answer..
There are Two questions about Steam Turbine Generator... What is HRSG bypass of LP, HP used for in power generation? In particualar, in the event that fault of HP bypass, there would be STG TRIP in operation but none on the LP bypass fault...what's the reason ?
ow can i get certificate of competency as electrical supervisor and my diploma in electrical engineering from jalgaon.
how can we phase identification in a distribution line,how we recognise that which phase is coming for a house hold connection.help me............
what is formula to cal cute earth pit numbers and size of earth strip used in earthing?
what is the principle of operation of CFL ??
Whata are the types of Cables?
