Patent ID: 8446701

Claim:
An apparatus for use with a power distribution system having at least a first power line and a second power line, the apparatus comprising: a) an interface having an input side and an output side, said input side capable of being coupled to at least said first power line, said second power line and ground node, and said output side of said interface having at least a first and second output nodes; b) a single-phase transformer having a primary side and a secondary side, said primary side having two primary coils, each primary coil having a first terminal and a second terminal, said first terminal of the first primary coil coupled to said first output node of said interface, said second terminal of the first primary coil coupled to said first terminal of the second primary coil and to said ground line, said second terminal of the second primary coil coupled to said second output node of said interface, and said secondary side of said transformer having two secondary coils, each secondary coil having a first terminal and a second terminal, the terminals on the secondary side arranged in an order of the first terminal of the second secondary coil, the second terminal of the second secondary coil, the first terminal of the first secondary coil, and the second terminal of the first secondary coil, and wherein said second terminal of the first secondary coil is coupled to said second terminal of the second secondary coil; and c) a power resistor, coupled between said first terminal of the first secondary coil and said first terminal of the second secondary coil.