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.

What are the disadvantages of hydropower?

1 Answers  

How many types oil using in transformer ? How many letars using in transformer..?

1 Answers   TATA,

How to calculate the heat load for a electrical room

1 Answers  

Is Softbitonline HT Transformer Design Software is AutoCAD compatible?

1 Answers  

what is the senstivity and stablity? what is different?

1 Answers  

what is the diff b/w HP and KW

10 Answers  

Why restricted earth fault protection is needed? Why can’t differential Protection is sufficient?

0 Answers  

how load of a turbo generator can be increased

1 Answers  

How Arc Produced in Circuit Breaker When the contacts of the circuit breaker open.

1 Answers  

transmission line losses

1 Answers   SVS Constructions,

total numbers of earthing of a transformer

1 Answers  

what is different between earthing and grounding for a electrical eqipment ?

2 Answers   BARC, Omega Maritime,