International Business Machines Corporation

Kirk J Treubert

Forrest K Smith

Dianne E Gaddis

Stephen J Malloy

A method for the transferring of 3 phase, asynchronous AC power between a present source supplying power to a load and an alternative source to supply power to the load. The maximum phase displacement is 60 electrical degrees at the load. The transfer can occur between sources which are rotating 'forward' or 'backward' with respect to each other or jointly with respect to the load. Either present source, alternate source or the load may be used as the timing reference for determining best phase connection of the alternate source to the load.

Universal phase match path generator for three-phase power

The resolution of two asynchronous three-phase power sources such that an optimal phase to phase matchup may be made between them. This is achieved with a logic system that receives a data point at the zero-voltage crossings of the three waveforms from each source. The data points create distinct 'states' of the three-phase waveform for each power source. There are six data points for each power source per cycle. The states of the load and source, along with information pertaining to the connection configuration of the present source of power to the load, are used to determine the optimum configuration for connecting an alternate or new source to the load based on information obtained from a lookup table.

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Fairfax Station, VA, United States of America

Kirk J Treubert