for 644KW load which MCCB should i use

Categories >> Engineering >> Electrical Engineering
Suggest New Category

Question Posted / umesh

6 Answers
9318 Views
I also Faced
E-Mail Answers

Answers were Sorted based on User's Feedback

for 644KW load which MCCB should i use..

Answer / wareagle

You have not given the required information to answer your
question. Voltage? power Factor? Type Load? Fault current?

Is This Answer Correct ?

6 Yes

2 No

for 644KW load which MCCB should i use..

Answer / karthik ccel

If i consider your 644kW load as a motor then,

I Assumed some parameters are:
644kW Motor, Power Factor - 0.9, Efficiency - 0.9, Load
Connected Voltage - 415V Then,

I = (644*1000) / (1.732*415*0.9*0.9) = 1106Amps
Considering 20% Margin = 1106 * 1.20 = 1327Amps

Conclusion:
So, We can choose Breaker rating is higher than that
1327Amps. Generally no one use the MCCB breaker above
800Amps. So, we can prefer the 1600Amps VCB Breaker for that
644kW Load.

Is This Answer Correct ?

6 Yes

3 No

for 644KW load which MCCB should i use..

Answer / antaratara ghosh

assuming the load as motor,operating voltage as 415 V,pf
as .85, efficiency as .95,

rated current, Ir= (644)/(1.732*0.415*0.85*0.95)
= 1110 A (approx)
now considering VFD starting for the motor,
starting current, Ist= 2*Ir
= 2220 A
considering margin of 20%, maximum current flowing =
2220*1.2 = 2664 A

Since MCCB are not used above 630 A in India, you have to
go for 3150 A (which is just greater than 2664 A and
available in market) ACB...

Is This Answer Correct ?

2 Yes

2 No

for 644KW load which MCCB should i use..

Answer / lokeshraj

Use 1600 Amp ACB.

Is This Answer Correct ?

0 Yes

1 No

for 644KW load which MCCB should i use..

Answer / ahmed raza

Formulla for calculation of breaker is...
Total load in Watts/380(voltage)*0.8(pf)*1.732(delta to Y
conversion)
So
= 644/380*0.8*1.732
= 1223.10
we can say
= 1250AMPs breaker should be use....

Is This Answer Correct ?

0 Yes

3 No

for 644KW load which MCCB should i use..

Answer / sami

Calculate 644kw load Amp
Breaker Selection Formula ( Amp*125% )
for Example : 1000A*125%=1250
Instal 1250Amp Breaker

Is This Answer Correct ?

1 Yes

5 No

Post New Answer

More Electrical Engineering Interview Questions

how to calculate neutrel current

2 Answers

1. Can a 12v DC choke operate a 60v/12w PL lamp ? 2. Can a 230v ballast fire / operate a 60v/12w PL lamps.

0 Answers ICS Integrated Computer Solutions,

why high current produce in case of transformer when turns are internally gets shorted.

3 Answers TCS,

Why electricity is generated and transmitted at the values of multiples of 11?

3 Answers

Generally In transformer Tap Changer on HT side, but I have seen in 66KV side in 220/66 KV, 100 MVA, Areva make transformer. Why ?

7 Answers

what is residuel magnetism. and how order lead acid batteries for 24 volt. emergency lighting system.

0 Answers

WHAT IS THE WINDING PROCEDURE OF ELECTRICAL MOTOR

0 Answers GE,

What is double throw isolator and single throw Isolator.

1 Answers KSEB, L&T, Siemens,

The temperature rise in the sys, which leads to ….. a) Increases stress& length b) increases stress but decreases length c) Decreases stress & increase length d) decrease stress & length

1 Answers Engineers India Limited,

what formula can be apply to calculate the No of rtrand of a cable. ?

1 Answers

What is meant by soft starter used in motors?

4 Answers

what is the use of piston rings in the engine used for a generator...........

0 Answers

For more Electrical Engineering Interview Questions Click Here