Transformer and watt or VA relation?

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Discussion Overview

The discussion revolves around the relationship between kilovolt-amperes (kVA) and watts (W) in the context of a 15 kVA transformer and its capacity to support multiple air conditioning units. Participants explore theoretical implications of load capacity, power factor, and the concept of diversity in electrical loads.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant questions whether a 15 kVA transformer can support 10 air conditioners rated at 1500 watts each, suggesting that the apparent power (kVA) must exceed the real power (W) adjusted for power factor.
  • Another participant reiterates the need for the apparent power to be greater than the real power divided by the power factor, emphasizing that the power factor is less than one.
  • A different viewpoint suggests that the transformer could handle the load due to the low probability of all 10 air conditioners operating simultaneously, introducing the concept of "diversity" in load management.
  • Participants discuss the distinction between kVA and kW, noting that reactive loads require higher kVA than kW due to power factor considerations.

Areas of Agreement / Disagreement

Participants express differing views on whether the transformer can support the load of 10 air conditioners, with some emphasizing the importance of power factor and others suggesting that operational diversity may allow for the load to be manageable. The discussion remains unresolved regarding the practical implications of these factors.

Contextual Notes

There is an implicit assumption regarding the power factor of the air conditioners, which is not explicitly defined. The discussion does not clarify the specific conditions under which the load calculations are made.

Who May Find This Useful

Individuals interested in electrical engineering, particularly those studying transformer capacity, load calculations, and power factor implications in practical applications.

neduet
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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

-----------------------------------------------------------------
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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