1
  1. If I say that my 160KVA 3 phase UPS can take 222Amps load, does it mean per phase or total load?
  2. If it is per phase, can I load 222Amps single phase load on each phase i.e a total load of 666Amps?
Mat
  • 1,536
  • 1
  • 17
  • 21
Aswani Kumar
  • 21
  • 1
  • 2
    I'm voting to close this question as off-topic because it is about electrical engineering not system administration. – kasperd May 07 '15 at 11:53
  • 1
    I disagree with closing the question. As part of system administration roles which I have held in the past, I have been required to use an environmental monitoring system to monitor airflow, temperature, humidity, leak detection and UPS Systems. One of the things I would consider when adding new systems to server racks was how it would impact the phase loads - loading one phase heavily while not loading the other two can cause additional wear on a UPS system and increase electrical costs for an unbalanced 3 phase load. – Evolutionise May 07 '15 at 16:08
  • @Evolutionise I agree. See my [this](http://meta.serverfault.com/questions/8128/my-ideas-and-suggestions-to-the-well-going-massive-content-destruction) post. – peterh May 08 '15 at 04:07

2 Answers2

2

It means a total of 222 Amps (max load) over all 3 phases. So you should not use all of this on only one phase but share it over all 3 as even as possible.

Sebastian
  • 241
  • 3
  • 7
  • Thanks Sebastain... but when we calculate %age of load(in amps) we consider 222A on each phase. ex. L1 - 78A L2 - 80A L3 - 78A. Percentage of Amps loading is shown as R - 35% Y - 36% B - 35% but as per your statement it should be R - 105% Y - 108% & B - 105%. – Aswani Kumar May 07 '15 at 11:40
2

I will assume you are using 230V electricity and not 110V (US & some other countries) as the calculations do not add up if its 110V.

  • P (Power) = V (Voltage) x I (Current)
  • I = P/V
  • I = 160000/230
  • I = 695A
  • I per phase is 695/3 = 231
    Looking at Phase 2 which has an 80A load out of a max 231A, thats a 35% load (80/231 * 100)

These figures are not exact as there is likely to be some losses in the system which need to be incorporated into the calculations.

Evolutionise
  • 311
  • 1
  • 4