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how to calculate the multiplication factor in HT incomer
trivector meters
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Answer Posted / er l r daroch
Line ctr*line ptr/meter ctr*meter ptr
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how u select control transformer for a mccb panels or any panels?for expample we hav 440 volts maim supply and control volts is 230v?
while starting a liquid starter ,is there any volage drop on water/soda on tank.can we touch the tank on starting?
What size cable (based on voltage drop) is required to supply a 40 A three phase boiler if the wiring system is 75V single insulated cables installed in non-metallic rigid conduit 56m from the main switchboard? Voltage drop in the consumer's mains is 8V.
Which of the following alternatives will be cheaper (1) A 100 h.p AC, 3-phase motor (2) Four motors of 25 h.p each (3) Five motors of 20 h.p each (4) 10 motors of 10 h.p each explain
IF alternator SCR value will be high means what happen in alternator efficency at operating power factor of 0.8
what is the difference between switch yard to residential area.and how much required it.
Can any body tell me the different types of LT cables & their application.
Pls tell me whether we can use EN3A material for shafts of Permanent magnet alternator.What will be the effect of magnetic and nonmagnetic material for shafts on magnetic properties of PM rotor .
Rules and standards of electrical control wiring ?
From reading, Under voltage relay used also as phase sequence relay now, Why I use under voltage and phase sequence relay in the same circuit (ATS)?
why all the feeders are designed in a particular manner ... is there any reason for that???
What are the commonly used schemes for the bus zone protection?
why dc is used in control circuits for MV & LV switchgeras instead of ac
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?
Why the unit sizes of hydro generating machines are not standardized as in case of thermal powerplants?
