thai dweller Posted April 6, 2021 Share Posted April 6, 2021 Hello! I have 3 phases coming into my business. However, some of the phases sometimes suffer from undervoltage which causes problems for my equipment. Does anyone know of a device/transformer which converts 3 phases of different voltage into one reliable phase? Thank you. Link to comment Share on other sites More sharing options...
metisdead Posted April 6, 2021 Share Posted April 6, 2021 Moving to the Electrical forum. Link to comment Share on other sites More sharing options...
Crossy Posted April 6, 2021 Share Posted April 6, 2021 It's called a phase-selector relay https://www.novatek-electro.org/automatic-phase-selector-pef-320/ It picks the "best" phase and switches to feed the load from that one. Use small ones like the one I linked to for individual loads or a bigger "whole installation" unit (with associated contactors) to feed everything. They were pretty common when we lived in Delhi (along with small voltage regulators for each A/C unit). Our place had the poor-mans version, 3 outlets (one on each phase) next to the TV, plug the telly into the "best" phase. 1 1 Link to comment Share on other sites More sharing options...
tjo o tjim Posted April 9, 2021 Share Posted April 9, 2021 Some UPSs are capable of doing this as well; the rectifiers are controlled a little differently than a normal UPS though— most will just switch to battery if one phase is out. 1 Link to comment Share on other sites More sharing options...
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