13-06-2018, 06:18 AM
Just had a full harmonic analysis done on some of our UPS boxes - the thing is, at relatively low currents (10 - 20A / phase), the harmonic content is rich (to say the least) but completely irrelevant as all modern kit largely ignores it.
These are 3-phase 150KVA boxes, so they're just idling at these load levels which is when the inverters make most noise. At 80% load they are as clean as a whistle.
These are 3-phase 150KVA boxes, so they're just idling at these load levels which is when the inverters make most noise. At 80% load they are as clean as a whistle.
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