Question { Sitara Energy, 124642 }

How to calculate HT XLPE CABLE for 11 kv / 433 v , 1500 kva
oil type transformer system?
plz provide step by step calculation

Answer

1500kVA X 0.8 PF = 1200Kw = 1200000W

P=RT3 V I COS fi

SO, P
I = -----------
RT3 x V x COSfi

1200000
I = -----------------
1.732x1100x0.8

= 79 A

Now take cable table and select the suitable xlpe cable.

Uday

Question { 16840 }

Pls say , how we calculate lux / sq.ft, which formula used
for calculation

Answer

Lux = Lumens/sq.ft.

for one are the formula will be -

Area in sq. mtrs X Required Lux
No. of fixtures = -------------------------------
Lumens O/p of fixture X U.F X D.F

Uday Kulkarni

Question { Voltas, 139151 }

how do you calculate IKW(consumption per TR) in HVAC?

Answer

1TR = 3.5kW is not possible.

generaly u can consider 1TR = 1.5kW

Question { Areva, 7374 }

we can stepdown the voltage from 230/12v ,and we use the
voltage for various electronics components why can't we
step up the voltage from 12/230v if we can shall we use the
voltage for domestic single phase supply

Answer

Yes, u r correct mr. Kawade, but transmission will too
complecated, coz as voltage is low then resistance will be
high.

Uday