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I’m running a film project that involves a huge LED wall.
I have 1000 screens that can pull .6 A each. They are balanced for load on a 400 A 3 phase supply but I’m measuring the same current in the neural as the phases.

Is this due to the harmonics it’s causing?
If so should I worry about what it’s doing to the generator powering it?

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  • \$\begingroup\$ Please clarify your specific problem or provide additional details to highlight exactly what you need. As it's currently written, it's hard to tell exactly what you're asking. \$\endgroup\$
    – Community Bot
    Commented Sep 12, 2021 at 4:44
  • \$\begingroup\$ Imagine a "current angle" of only one third of each halfwave: the currents don't overlap at all; the neutral woud be seeing about 600 A: power/crest factor doesn't have to be real bad for neutral current in the ballpark of line current. \$\endgroup\$
    – greybeard
    Commented yesterday

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Yes it's probably harmonic current, to be sure measure the frequency.

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  • \$\begingroup\$ Are the power supplies PFC (power factor corrected)? \$\endgroup\$
    – Kartman
    Commented Sep 12, 2021 at 3:29
  • \$\begingroup\$ Thanks for getting back to me. I don’t believe they are PFC as they are a totally new product from China. When we have them all running I can it’s making the voltage on the generator a little unstable and I’m concerned that It will effect the windings on the generator. \$\endgroup\$
    – James S
    Commented Sep 12, 2021 at 7:07

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