For a certain load i need 100kw load ,In that case what
rating mccb should i use?
- 5 Answers
- 10893 Views
- I also Faced
- E-Mail Answers
Answer Posted / chintan patel
It can be different for DC , 1phase AC , 3 phase AC , systems,
Lets calculate for all ,
1 ) For DC ( you have not mentioned Voltage but considering 230 V )
100 kw means 100000 watt
formula for DC power p= vi
100000= 230xi
i=100000/230= 434 amp
we always use current rating of the mccb is 1.5 times of full load current so we can use 434x1.5= 652 amp.
( if system is not running on full load select 630 Amp MCCB, if its on full load select 800A )
2 ) For 1phase AC,
Power: P = V I cos phi ( cos phi is power factor is not known assume 0.8 )
100000 W = 230 x I x 0.8
I = 543 Amp
we always use current rating of the mccb is 1.5 times of
full load current.
mccb required 543 Amp X 1.5 = 815 Amp
select 800 Amp MCCB
3)
If load is 3 phase AC ,
Power P = sqrt(3) x V x I x cos phi
100000 w = 1.73 x 415 x I x 0.8
I = 174
we always use current rating of the mccb is 1.5 times of
full load current.
mccb required 174 Amp X 1.5 = 261 Amp
( if system is not running on full load select 250 Amp MCCB,
if its on full load select 315 A )
| Is This Answer Correct ? | 3 Yes | 0 No |
Post New Answer View All Answers
BSNL TTA EXAM QUESTION
What are n circles?
what is per unit calculation?looking for simple and strong explanation thk u
In ht capacitor ckt we are using LBS Panel it having isolator with fuse, one of HT fuse flash over, so what is reason behind this event.
What happens if we connect a single phase energy meter in reverse polarity.
Please explain me about Relay curves and their sources to read ?
What is Delta Connection? What is meant by Forward Delta & Reverse Delta & How Will be the Connection in Power Transformers?
static chagre
What is industrial plc
Define sensitivity?
what is errection pcbs?
what is the transiant condition in alternator? and how it can be prevanted?
how we calculate the withstansing current capacity of wires&cables?
what is the size of ht cable of 33kv ht line and transformers ratings are 1 Mva and 5mva.please send formula also.
What is Servo Ventilated Motor?
