Abstract: In an electrical power supply system provided with a step-down distribution transformer connected to a power source to supply current to at least one neutral grounded load center, said power source having a conductor connected to a first primary grounding connection, said distribution transformer having a magnetic core, and a primary and a secondary winding independently mounted on said magnetic core, said secondary winding being electrically connected to a pair of output terminals and to a center-tapped neutral terminal, said terminals being connected to said load center, said primary winding being electrically connected to a pair of input terminals arranged for connection to said primary power source, one of said input terminals being further connected to a second primary grounding connection, said center-tapped neutral terminal being connected to said second primary grounding connection via a shunting conductor, an improvement comprising a current balancing transformer (CBT) having a magnetic core and a fi

Abstract: A power supply board for connecting dry communication lines from a remote station to the electronic equipment at a power station and includes a brushless PM motor mounted in a motor section of the board. The motor is powered by a station-derived low voltage direct current source provided at the power station. A brushless PM generator is mounted in a spaced alternator section on the board. The motor and generator shafts are connected by a flexible tube for generating a voltage suitable for operating of the electronic equipment at the power station. An integrated motor drive circuit is mounted on the motor section and connected to the D.C. source via a protective circuit. The motor has a bank of Hall cell sensors for generating position control signals to the circuit for sequential energization of the three phase motor winding. The output of the alternator is rectified to establish an output voltage for operating the communication equipment.