3 phase 240VAC balance

[BSEET1986]

I have a transformer fed 100A 3 phase 240VAC system (no neutral). The system uses 240VAC phase to phase connected heaters and 3 phase motors. I have balanced the phase currents on paper assuming all loads on and running.
However, the system doesn't need all loads all the time.
How do I address voltage and current imbalance? I'm not too concerned with voltage since I think the delivered voltage will be very close to 240VAC (75kva transformer on 15kva system and no long wire runs). Further, 10-12% voltage differences between phases are typical. Any feedback or suggestions are appreciated.

 

[petersonra]

I have a transformer fed 100A 3 phase 240VAC system (no neutral). The system uses 240VAC phase to phase connected heaters and 3 phase motors. I have balanced the phase currents on paper assuming all loads on and running.
However, the system doesn't need all loads all the time.
How do I address voltage and current imbalance? I'm not too concerned with voltage since I think the delivered voltage will be very close to 240VAC (75kva transformer on 15kva system and no long wire runs). Further, 10-12% voltage differences between phases are typical. Any feedback or suggestions are appreciated.

10% voltage differences between phases at the transformer secondary are not typical at all, regardless of load.

There is no need to worry about current imbalance. it's just not that much of an issue.

 

[LarryFine]

As long as your loading is balanced when at full load, you're okay when less than fully loaded.