Question { 2813 }

How we can design a cable for a 3phase load.

Answer

this is depend on load data,distance from source,laying method

Question { 3259 }

Whot is the braking capacity for MCCB. How we select
different braking capacity.

Answer

50 KA is the standard breaking capacity to all.other is avail
with 65 KA and so on.this is depend upon the connected load
fault characteristic

Question { Kirloskar, 6136 }

sir,
why alternator output is connected to delta side in to
generating transformer? any reasion?

Answer

COZ ALTERNATOR ARE GENERALLY STAR CONNECTED WHEREAS THREE LEADS ARE SHORTED AND OTHER THREE LEADS ARE OUT,THEN CONNECTED TO DELTA/DELTA OR DELTA/STAR CONNECTED TRANSFORMER'S DELTA END.DELTA CONNECTION WINDING IS MANDATORY AT ALTERNATOR OUTPUT SIDE.BECOZ IN SAME VOLTAGE LEVEL TWO STAR POINT IS NOT ALLOWED.IT WILL CAUSE OF HUGE AMOUNT CIRCULATING CURRENT FLOWING IN UNINTENDED PATH AT THE TIME OF FAULT/UNBALANCE AND MALFUNCTIONING OF PROTECTION RELAYS

Question { 6810 }

IF we have 500kva transformer & know the current on HT & LT side, how can we consider for its breaker?

Answer

breaker rating is selected near to the calculated current of equipment and standard rating of breakers. but it is very important to know the fault current of that
system/ckt where it to be attached.

Question { Videocon, 5735 }

in transformer the unit of power is in kva why?

Answer

bcoz it's unit is not depend on the power factor of the system.

Question { 3008 }

Why usually in all electrical equipment taking more current
in Y pahse like pumps,compressor,or any other applications

Answer

logically this is not possible unless check voltage across all phase at that time.because generally we mostly use Y phase current/voltage feed backs for accurate/fine measurement or protection system

Question { 3648 }

advantages of vvvf drives over non vvvf drives for EOT cranes

Answer

low energy consumption,faster and smooth operation,high grade safety,reduced maintenance cost are only the reasonS