Patent ID: 9450410
Filing Date: 2016-09-20
CPC Classification: H02H,H02J

Claim Text:
1. A surge suppression system of a power distribution system of a power grid which provides power to low-voltage power consumers, comprising: at least one three phase system transformer of said power distribution system having a primary side which receives three phase power from a power source through first, second and third power distribution lines, which each transmit a respective phase of said three phase power, and a secondary side, which supplies three phase power downstream through fourth, fifth and sixth power distribution lines which each transmit a respective one of said phases of said three phase power, said primary and secondary sides including respective primary and secondary side coils to transform said three phase power from a first voltage on said primary side to a second voltage on said secondary side different from said first voltage, said system transformer stepping said first voltage up to or stepping said first voltage down from one of a medium voltage or a high voltage; and at least a first surge suppressor unit which is connected in parallel to said first, second and third power distribution lines on and in immediate physical proximity to said primary side of said system transformer, said surge suppressor unit comprising first, second and third transformer banks which correct voltage imbalances in respective phases carried by said first, second and third power distribution lines resulting from one or more surges due to an electro-magnetic pulse (“EMP”) or geomagnetic disturbance (“GMD”) whose voltage and/or current exceed normal operating levels by at least ten times, said first, second and third transformer banks including respective first, second and third primary coils which connect to and receive the respective phase of three phase power carried by said first, second and third power distribution lines at said first voltage, said first, second and third transformer banks also including respective first, second and third secondary coils which connect in series together and have a resistor connected in series therewith to harmlessly drain energy from a surge due to an EMP or GMD whose voltage and/or current exceed normal operating levels by at least ten times, wherein said transformer banks transform said three phase power at said first voltage to three phase power at a third voltage wherein a voltage imbalance in any one of said three phases on said secondary coils is counterbalanced by the remaining phases on said secondary coils which counterbalances voltage imbalances on said primary side of said system transformer of said power distribution system.