Interested to Buy Any Domain ? << Click Here >> for more details...
WHY IS RESTRICTED EARTH FUALT PROTECTION NEEDED?? WHY CANT
DEIFFERENTIAL PROTECTION SUFFICE???
- 14 Answers
- 29285 Views
- I also Faced
- E-Mail Answers
Answer Posted / jwalant yogi
First of all, REF protection is used for the case of
internal faults of the transfomer.Secondly, in REF, usually
when the current flows back form the neutral to the source,
there is much larger current change in the neutral current
as compared to the phase currents.And Differential
protection usually works senses the changes in the phase
currents which is not much larger, that's why differential
protection and REF protection are totally different from
each other.each of them is having different significance
and used for a particular application.
| Is This Answer Correct ? | 1 Yes | 0 No |
Post New Answer View All Answers
If a transformer primary winding operates at 240v, the secondary at 120v and the load is 1500w & the transformer is rated at 92% efficient, what's the current flowing through the primary winding of the transformer? What is the formula for finding this?
what is Different between Bilinear and Unilenier?
State magnitude criterion.
In ups static switch if i gives the supply at output end it will open the circuit in stactic switch or not if it will open then how it operates.
What is load boxes ?
Can double compression glands be used with regular cables?
how we explain parallel paths armature winding?
What is the difference between Droop vs Isoch Control?
what is there inside an inverter and how it works?
what is the difference between switchgear and circuit breakers and is there any difference between outdoor and indoor switchgear and circuit breakers , and how would you differentiate between switch yard and substation and grid station . thanks
what is a reactive power? what is the relation with power factor?
What is the difference between DOL starter and star delta starter
how a.c. genarator control power factor when its conected to grid supply by incrising or decresing excitation voltage.
Define conversion efficiency of a power amplifier. What is its value for class c power amplifier?
What is lc oscillator?
