H - Electricity – 02 – J
Patent
H - Electricity
02
J
H02J 3/14 (2006.01) H02J 3/26 (2006.01)
Patent
CA 2086650
MULTI-BUSHING SINGLE-PHASE ELECTRIC DISTRIBUTION TRANSFORMER FOR FEEDER PHASE CURRENT BALANCING Abstract In three-phase electric power distribution systems, kilowatt-hour conductor losses can be reduced by keeping the current flows in all three-phases as equal to each other as possible. A secondary benefit of phase balancing is an improved voltage regulation. At present, phase balancing can be achieved by taking the phase- current measurements, detecting a feeder with a significant current unbalance,identifying a single-phase transformer connected to the highest loaded phase, and then manually reconnecting it to the lowest loaded phase. The operation involves time consuming activities in engineering, and the deployment of personnel, equipment and resources for its execution, plus loss of revenue and/or inconveniences caused by an outage of several minutes duration. In this invention, a single-phase transformer is provided with: three high-voltage bushings, and an internal high voltage side three-position load-break switch. All the necessary connections are already in place, and through the operation of the switch the transformer load is transferred from the highest loaded phase to the lowest loaded phase; thereby tending to an equilibrium of circuit phase currents and therefore reducing the system losses. The invention makes the phase-balancing process fast, easy, convenient, safe, and economical.
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