Transformer and watt or VA relation?

AI Thread Summary
A 15 kVA transformer can theoretically support 10 split air conditioners, each rated at 1500 watts, but the actual load must consider the power factor (PF). Since the apparent power (kVA) must exceed the real power (kW) divided by the power factor, the total load could exceed the transformer's capacity if all units operate simultaneously. The discussion highlights that the likelihood of all units running at full capacity at once is low, a concept known as "diversity." However, it's emphasized that the difference between kVA and kW is crucial due to the power factor, which affects how much real power can be drawn. Understanding these relationships is essential for proper transformer load calculations.
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Hi friends
it is not ( problem or numerical) just i want know


friends if i have 15kva transformer .
then can i say it can carry 1500 watt 10 (split AIR conditioners) as a load.
and what happened if i add 5 more (split AIR conditioners) in same case. just give me idea please.theoreticallyAdditional Details
15kva transformer is step-down give 220 volt r.m.s output and
AIR conditioners (a.c)(with common power factor) also can operate on 220 volt or 1500 watt each.
 
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No! Because:

Str should be greater than Pl/PF

However:
Str = 15 KVA
Pl = 10 X 1.5 = 15 KW
PF <1

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Creative thinking is enjoyable, Then think about your surrounding things and other thought products. http://electrical-riddles.com
 
m.s.j said:
No! Because:

Str should be greater than Pl/PF

However:
Str = 15 KVA
Pl = 10 X 1.5 = 15 KW
PF <1






-----------------------------------------------------------------
Creative thinking is enjoyable, Then think about your surrounding things and other thought products. http://electrical-riddles.com


Sir please explain more for me. if you can...
i can't understand this.

thanks a lot
 
sorry! I can not.
 
I would say you can because the odds of all 10 being on at the same time are low. That's called "diversity".

M.S.J.'s point, though, was that the difference between kva and kw is power factor. Because of power factor, a reactive load draws a higher kva than kw.
 
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