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Single Phase to Three Phase Converter

Neil Williams

Hi All

Asking if anyone knows of any suitable equipment to convert a 230VAC (One Phase Three Wire) domestic supply ( via standard socket outlet) to 400VAC (Three phase Four Wire) supply for use with resistive only equipment. I am planning on building a small demonstration switchboard and want to construct and wire as a typical 400V TP&N assembly, to demonstrate energy monitoring hardware via  a few TP&N supplies.

So far I can find similar converters bit most advise these are for use with 3 phase asynchronous motors only

Thanks in anticipation

Neil W

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    Most such converters rely on the inductance of the motor windings for proper operation

    Undoubtely true for motor drives. In theory that that need not be the case though - there are plenty of general purpose inverters out there - e.g. for PV or battery sources (both grid-tried and off-grid) or UPSs - that are perfectly capable to driving arbitrary loads. I can't think of a single unit unit I've come across that includes a rectifier first stage in the same unit though (i.e. single phase mains -> d.c. -> 3-phase a.c.) (at least without a batter, making it a UPS), even though it seems to be entirely feasible technically.  Maybe it's just economics - it's probably cheaper to "right size" inverter drives on a few machines that really need 3-phase than to make a large unit that would have to cope with possibly large demands of a workshop and be underutilized 99% of the time. Even less so for a demo project.

       - Andy.

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  • 0

    Most such converters rely on the inductance of the motor windings for proper operation

    Undoubtely true for motor drives. In theory that that need not be the case though - there are plenty of general purpose inverters out there - e.g. for PV or battery sources (both grid-tried and off-grid) or UPSs - that are perfectly capable to driving arbitrary loads. I can't think of a single unit unit I've come across that includes a rectifier first stage in the same unit though (i.e. single phase mains -> d.c. -> 3-phase a.c.) (at least without a batter, making it a UPS), even though it seems to be entirely feasible technically.  Maybe it's just economics - it's probably cheaper to "right size" inverter drives on a few machines that really need 3-phase than to make a large unit that would have to cope with possibly large demands of a workshop and be underutilized 99% of the time. Even less so for a demo project.

       - Andy.

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