Detection and compensation of power phase loss
AssigneePhasor Ltd
InventorOren Tamir
Life of this patent
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Abstract
Systems and methods are provided for detecting and compensating for loss of a phase of a three-phase power source, elements of the system including: a sensing unit, which measures current and voltage levels of each phase of the three-phase power source; a switching unit having three primary relays and three backup relays; and a microcontroller, configured to receive measurements from the sensing unit, to determine from the measurements a lost phase and a less-loaded phase of the two remaining phases, and responsively to activate the switching unit to disconnect the lost phase and to connect the less loaded phase to provide backup power in place of the lost phase.
Claims11
A phase compensation circuit, for detecting and compensating for loss of a phase of a three-phase power source, comprising:
- a sensing unit, comprising sensors configured to measure current and voltage levels of each phase of the three-phase power source;
- a switching unit comprising three primary relays, each primary relay normally closed to connect a respective phase of the three-phase power source to a respective phase output load line, and three backup relays, each backup relay normally open and when closed forming a connection between two output load lines;
- and
- a microcontroller, configured to receive measurements from the sensing unit, to determine from the measurements a lost phase and a backup phase, and responsively to activate the switching unit to disconnect the lost phase from its respective output load line and to connect the backup phase to the lost phase output load line to provide backup power in place of the lost phase.
A method for detecting and compensating for loss of a phase of a three-phase power source, comprising:
- providing a sensing unit configured to measure current and voltage levels of each phase of the three-phase power source;
- providing a switching unit (32) having three primary relays, each primary relay normally closed to connect a respective phase of the three-phase power source to an output load line, and three backup relays, each backup relay normally open and when closed forming a connection between two output load lines;
- and
- providing a microcontroller (34), configured to receive measurements from the sensing unit, to determine from the measurements a lost phase and a remaining phase, and responsively to activate the switching unit to disconnect the lost phase and to connect the remaining phase to provide backup power in place of the lost phase.
Dependencies are inferred from the claim text.