Assume PF of transformer is .8.
rating of transformer=1500kVA=1500X.8=1200kW
So that maximum current-
So cable size required if copper cable
1mm=4amp= 400sqmm(by consedering all factors)
For aluminium cable
First calculate the current of primary side(HT) and derate the cable by atleast 0.7.
Current I after Derating =78.73/.7 =112A (0.7 if laid on the trays or value will vary if buried in the ground).
Cable equivalent to rating has to be selected.
Now Short circuit withstand capacity (sq. of I X t in sec) has to be checked from the cable catalogue.This value of cable should be higher then SC withstand capacity of the ground usually it is 50KA.it less go for next size and finalise.
HT Cable select, its depend of incoming capacity of feeder
line. say feeder capacity 100 MVA SO Calculate current I=
100*100/11*1.73=5.25kA. So we can select of HT Cable for
minimum short ckt current carrying capacity of minimum 5.2kA.
what is the Mechanism of energy saver FAN how average
power,reactive power, power factor e.t.c realated to it and
how it apply to this FAN .and how this fan save energy
w.r.t circuit analysis,plz repaly to this question this is
the assignment to given to me.thanks
What are the difference between these terms ? e.m.f,
voltage, potential, potential difference, current etc?
what are the difference between these terms ?
(electromotive force) e.m.f, voltage, potential, potential
difference, reference potential, reference potential
How can i explain and describe these all terms in single
line each and little more explaination too