Answer / rasel-amie

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.

Answer / er.rupam dwivedi

A=kva x 1000/1.732x ht voltage=ht cable selection

Answer / uday

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

Answer / govind bisht

Assume PF of transformer is .8.
rating of transformer=1500kVA=1500X.8=1200kW
V=433(3phase)
So that maximum current-
I= P/V*PF
=1200*1000/1.732*433*.=1600A
So cable size required if copper cable
1mm=4amp= 400sqmm(by consedering all factors)
For aluminium cable
1mm=2.5A=640sqmm

Answer / m.jagadeeshwar

for 11kv side current = kva*1000/1.732*11000

= 78.73 amps
for 78.73 amps 3 core 25 sqmm cable is sufficient

Explain and give examples about VCB?

0 Answers   AZ Engineering, Vodafone,

Where can I get Iidian straderd specifications for electrical items or works in web? please help me.

0 Answers  

How to convert 110 volt alternating current to 12 volt direct current

2 Answers  

show the single line diagram of star delta starter with single phase preventer

0 Answers  

can we install HT panel & LT panel side by side or how much clearance is required ?

0 Answers  

what is difference between c-power & u-power air circuit breaker?

2 Answers   Areva, IIT, Marine Electricals,

What kind of preventive maintenance are there for AC induction motor?

1 Answers   Gulf,

Hi Recently I got one formula that is Impedence of Xformer = Rated KVA/Root 3 * secondry voltage OF Xformer. Is it Right??????

2 Answers  

Just a silly question but just to make my curious mind bac to normal - Why was not 67 and 67N relays built into a single relay as i have noticed that the R,Y,B CT wiring end up into the 67 relay while the common of the R,Y,B CT wiring end up into the 67N relay. Then it was better if a single relay was manufactured just like the distance relay (21). Another question i would like to ask is - how do we know where the 67 and 67 N relay has to be placed.why is it not placed at the transformer bay? In the substaion that i am working -i have noticed that it is placed between a breaker and a common double bus bar and this line bay is connected to another substation at a remote place which is furthur connected to a load. B U S______CT for 67 & 67N ______Breaker _____ remot s/s. B A R

1 Answers  

What is voltage ratio of a transformer?

0 Answers  

How to calculate the Airconditioner capacity for a standard telecom BTS shelter?

3 Answers  

What is the current carrying capacity of 1.5 rm and 2.5 rm cable

1 Answers   RFL,