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Anyone knowing of a module that can monitor three incoming electrical phases to a home. If the load goes over a certain maximum, the device changes to one of the other phases for supply to e.g electrical motor?

Kind regards

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  • \$\begingroup\$ Wouldn't it be easier to pre-allocate loads to phases so you always have enough capacity on each? \$\endgroup\$ – pjc50 Dec 6 '12 at 9:56
  • \$\begingroup\$ What's the fun in that? \$\endgroup\$ – Christian Dec 6 '12 at 10:19
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Industrial crossovers are expensive. YOu want to choose ZCS SSR's and use 3 with Exclusive OR Logic to prevent catastrophic enabling of more than one. Current monitoring of each phase is needed which might require a custom setup with suitable time delay to prevent hunting for the next available phase in case the motor creates an overload on all phases. In a power outage situation there must be a default phase chosen followed by the "low man wins" in current sensing in case of time averaged current overload. You don't want transients to trip it. What's your budget. $200 or $2K 1st needs design and time. 2nd needs capital Both need installation and testing and calibration of trip points. It may be practical to decide when to to switch in 1 second and actual transfer phases in 1 cycle. Are these line to line or single phase? Assuming latter.

Where do you live that has 3 phase going to a home?

Here is one Industrial example (not cheap ) http://www.indiamart.com/srielectronics/power-transformers.html#automatic-phase-selector

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  • \$\begingroup\$ Thanx for an excellent post! I live in Sweden, where it's most common to have three phases in each home :) \$\endgroup\$ – Christian Dec 6 '12 at 10:18

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