A guy in the UK has a product, which is designed to feed power to a
50KW resistive load, from a three phase 415 50Hz power line, wired in a delta configuration. He wants to use the same 50KW heating element load, but he wants to use it in Canada, connected to a 600vac three phase 60Hz power line. I think a light dimmer type circuit could be installed in his circuit to compensate for the higher line voltage. I have used some big dual SCR power blocks with 95 amp ratings before but never in a 3-phase circuit. Does anyone have a design for a 3-phase light dimmer type circuit, which might solve this problem? Also, he is currently using a three phase 24vdc, 150 watt switching power supply, which has a maximum input voltage of 550 volts AC. He needs a power supply which will work in Canaday at 600vac. Does anyone know of a power supply manufacturer, which has a high input voltage rating?David A. Johnson, P.E. --- Consulting Engineer
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