Interested to Buy Any Domain ? << Click Here >> for more details...
WHY IS RESTRICTED EARTH FUALT PROTECTION NEEDED?? WHY CANT
DEIFFERENTIAL PROTECTION SUFFICE???
- 14 Answers
- 29168 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
can we use engine degreaser for electrical motors?
What are your personal skills and abilities for such a Master Course and your possible preparation to undertake this course?
how we can calculate power factor in single phase & three phase ?thank u
what is meant by 3rd hormonics ?
what is a pulse transformer? how rise time of pulse changes when ever the voltage changes?
is the value of inductance depends upon the value of thitha in doubly excited machine??
is all the servo motors having brake?please specify which servo motors having brake for stop on position and which are not.
what is the difference between electrical choke and electronic choke?
need to make a report. Need to choose a 3phase induction motor. Load conditions motor will operate in : Maximum Load: 30 Kw Speed: 2950 rpm Ambient temp: 20 cent Supply voltage: 440V Frequency: 50Hz need to look for the safety factor when choosing the motor, went through catalouge found a few, but dont know how to choose the safety factor allowing an extra load something above 30 KW to avoid any harm.
draw the block diagram of fire alarm?
In case of generator when we consume more power produces by it why load on generator increase and starts sound more. and how it is adjusted..
why incomer bay is required before transformer bay if there are more than 1 nos. of transformer bay.
Best way to measure the Soil resistance of rocky soil, three probe method and four probe method
what is the use of expulsition protective gap in 11Kv line.
Help need in transformer !? Hello Friends The parameters of 2300/230 v 50hz t/f is R1=0.286 ohm R`2=0.319 ohm Rc=240 ohm X1=0.73 ohm X`2=0.73 ohm Xm=49.2 ohm Secondary Load impedance ZL=0.387+J0.29 solve the exact equivalent circuit with normal voltage across primery.. I know every thing but i cant find CURRENT I1=? and I`2=? Please help me give solution or only Formula please please...
