Answer / abdulsubur

Total load =187kw

p=root3*vicosphi
i=p/root3v*cosphi
we get aprorximately 400

Answer / abdulsubur

we get appoximately


cb= 400A

Answer / ramaraj.g

Selecting main CB rating first.
187KW / votages LL
187000/400
467.5 amps this type current rating is not in market
so we will go to next rating 600 Amps

Answer / abdulsubur

P= Root3*vicosphi

calculate i from this equation apploximately
we can use 400A ircuit Breaker

Answer / rajendran

Apart from the nominal operating current we have to
consider the following factors also

1) Capacity of the source
2) Fault lvel of the system
3) Breaaking capacity of the breakeer required based on the
fault level obtained..
4) Space avilable
5) cost requirements
6) Method of controls in the breaker
7) Protection facilties avilable....

Answer / bala

Selecting main cb rating depends on the type of load if it
is combination of small loads (upto 10kw) 400amps mccb is
enough.
1. if it is one motor load. first we have consider what
type of starter we are going to use. in case of star delta
starter select 600amps mccb. in case of VFD and softstarter
400amps mccb is enough.

how to find the Motor,s insulation Power?

0 Answers   Gourmet Group,

1.Why sinle phase motor is not self starting 2.working principle of alternator 4.list out electrical formula

2 Answers  

WHY IS THE SIZE OF HOLE OF THE EARTH POINT IN THE PLUG POINT BIGGER THAN PHASE AND NEUTRAL

7 Answers   Jindal,

what is the min and max dc voltage for a dc system (110vdc)

1 Answers   ASD Lab,

What are the various types of BUSBAR Schemes? explain each

2 Answers   Thermo,

why rating of transformer is in kva instead of kw?

3 Answers  

What is transposition in a transmision line?

2 Answers  

we all know that corona is nothing but ionization of air around the conductor and there by allowing current to pass through ionized air.but we are not getting any short circuit in between the respective phases though the air turned as a conductive media between them??

1 Answers   Siemens,

Air circuit breaker safety

0 Answers  

in our transmisison sub station why we step down firstly 132kv\33kv then 33kv to 11kv. can we direct step down 132kv to 11kv.

2 Answers  

how i calculate the size in mm of the LT 4 core cable for 100 HP inductive motor pump

1 Answers  

in case of three phase induction motor,when it is connected to three phase supply,why the magnetic field is rotets around the armeture?

5 Answers   Hindalco,