How would you supply a single house hold load from a 3-phase supply coming out of a sub-station?
4 7233How would you supply power to a village which is very far from a sub-station and has only a 11k?
4 6974At site, we have 30Kw motor (3 phase, 400V,50Hz) and FLC 54A as per the nameplate. At the time of starting it draws 840A instead of 390A (7.2%). As per the data sheet also its 390A starting current. it thru a dol starter from the MCC. can anyone tell what is the problem in the motor
ME,
5 9673What is the Derating factor of power cables when exposed to direct sunlight in (both PVC & XLPE).
1 4621why it is not advisable to run low rating (19KVA) DG sets in parallel for long durations even though they are provided with droop ckts (QDC)
1464hai iam arunkumar. i have applied for an section enginner in rrb. i want lat 5 years solved question papers. if u have please sedn it to arun30682@gmail.com
RRB,
1302Post New Electrical Engineering Questions
How CFL &T5 tube light glows?
1.what is meaning of curve into a mcb. 2.what is basic reason changing of curve
if field breaker of generator is closed prior to its rated speed on a power generating unit. what will be the effect on generator, unit transformer and starting transformer.
what is the vvvf in the dumbwaiter?? or lift. what is the actual process?/
i have been tasked with a design of protection, metering and control(PMC) relay panel extension to accommodate all PMC relays.There is an already existing panel where this one will be built.What are the design aspects for this kind of project? thank you.
What is a compensator?
what is high - pot test. what's its use?????
is the value of inductance depends upon the value of thitha in doubly excited machine??
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?
What are the main parts of central chiller plant? Explain the function of each stage.
I have been using an 600VA with 0.6 p.f UPS with my desktop which has 450W power supply unit. Can anyone explain how can this happen . Because the output of the UPS is 360W (600*0.6) (<450W)
What are m circles?
What is the function of the circuit breaker failure relay?
what is ic 01,ic 06 ?is it types of cooling?
what is size of 3phase 4wire cable to be used for 11 ton ductable A.C and how to calculate cable size for different load
