HOW TO IDENTIFY THE RELAYS WHICH APPLICATION IN WHICH RELAY
USING
Answer Posted / r
for transmission lines - impedance , reactance and
diffrential,over current relays are used
transformer- buchoz relay,diffrential relay,over current
etc are used
for finding internal faults - diffrential relays are used
| Is This Answer Correct ? | 16 Yes | 1 No |
Post New Answer View All Answers
Does the direction of rotation of d.c. Shunt motor would get reversed if the armature current and field current both are reversed?
Explain the experiment on ward leonard method of a speed control on a dc shunt motor with an suitable circuit diagram.
I have done my m.tech in electrical engg discipline. Can any one please suggest me how should I prepare for getting into phd in iit or nit.How should I prepare for getting into lecturership
According to conduit size which size wiring & how many wires can we provide wires in conduit & how can we select conduit size accordingly?
Why derating factor os applied on Cables?
We have drive feeding an output contactor for a 5000 hp motor @ 5kV application. The motor FLA is 629amps x 1.25% service factor = 786.25 amps The cable that we current have in place between the drive and the output contactor is 350kcmil- MV-105 (parallel cables). Per the NEC table 310.60 (C) (69). This show the cable ampacity is at 615 amps per cable for a rating of 1230 amps. We have derated the cable for the cable tray and the multiple cables application and our calculations show that after the correction factor factor we are at 922amps. 1230 amps x .75% correction factor factor = 922.5 amps. The customer is driving us to then use another safety factor of .25% off of the already derated cable. Can you please provide a longhand calculation for your solution on this application?
i have a 4 Mva transformer 34.5 kv / 480-277 v and i used 2 parallel 3200 amp bus duct for the secondary feeder using 3 ply of bus bar ( 3/8" x 5" ) as a common where the flexible link terminated and 6300 amps breaker for the main, the lower bus duct reaches 70 degrees and the upper bus duct reaches 55 degrees when i used thermal scanner. why the temperature is not balance when the load reaches 3600 amps.
Can RCD's used to protect the VVVF drive if not why.
i have applied for the post of RRB section engineering chennai board please send me previou papers and solved answer. my mail id jagarapusrinivas@gmail.com
What is the basic rule for block diagram reduction technique?
Explain (in simple ) - root mean square. whats its role in electrical fundamandal.where its used
If we need 4c× 50mm sq cable but it's not available so we can pull 4c×25mm sq two cables?
what is the breaking capacity and making capacity of circuit breaker and how
What is routh hurwitz stability criterion?
in ring main system we use the isolater b/w transfer bus and main bus if we r not use isolatar than wat will be the effect in our sys.