for 644KW load which MCCB should i use
Answers were Sorted based on User's Feedback
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 |
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 |
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 |
what is transformer?
in HVDC transmission system ,monopolar link has one conductor usually a negative polarity and use ground or sea return ?through negative polarity we could pass electricity or not yes means how it is possible
What is the difference between bushing and insulators.? what is the creepage distance?
Whether amorphous core transformer is available in India?.If available then up to what rating of voltage and KVA?.
0 Answers DAE, Tata Chemicals,
what is the question paper model for section engineer in RRB
what is the difference between the following 2 situations ? 1)Line & Neutral=240V Line & Earth=230V Neutral & Earth=10V 2)Line & Neutral=230V Line & Earth=240V Neutral & Earth=10V
Why we specify TNC switch with 1NO 1NC ,2NO 2NC ? how we get connection.?
If a ACB breaker is tripping and closing problem, then what will we check internal..?
How many distance in distribution pole OR 33Kv line pole
Comparing to AC transmission, corona & R in DC transmission is……. a) lower b) higher c) same
If i want to build 230kv substation what are the equipments to be installed?
In which of the following case, the rotating magnetic field is reversed? A regenerative breaking B plugging C dynamic breaking D forward motoring