Crane Nuclear, Inc.

Liberty Technologies, Inc.

Louis Ricciuti, Jr

Martin Joseph Dowling

George Fox Lang

Binish Praful Desai

A method of detecting broken rotor bars including sensing currents applied to the motor, converting the senses signals to digital data signals, and storing the digital data signals. A processor evaluates the digital data to provide a current signal spectrum at various selected sidebands. Sideband peaks having an amplitude within a predetermined value are identified, indicating potential motor problems or developing problems, including winding faults and broken rotor bars. Advanced signal processing techniques are used to further evaluate stored data and to provide trending information.

Motor condition and performance analyzer

A motor performance analyzer senses currents and voltages applied to the motor, converts the sensed signals to digital data signals, and stores the digital data signals. The analyzer includes a processor for evaluating and comparing the digital data signals to predetermined values for voltage and current of the motor to determine and check for the correct placement of the current and voltage probes along corresponding phases of the motor. The analyzer also includes &lsqb;and&rsqb; a display for alerting a user or technician to potential motor problems, or to developing problems, including winding faults and broken rotor bars. &lsqb;Advanced signal processing techniques are used to further evaluate stored data and to provide trending information.&rsqb;

Method of monitoring placement of voltage/current probes on motors

A motor performance analyzer senses currents and voltages applied to the motor, converts the sensed signals to digital data signals, and stores the digital data signals. The analyzer includes a processor for evaluating the digital data and a display for alerting a user or technician to potential motor problems, or to developing problems, including winding faults and broken rotor bars. Advanced signal processing techniques are used to further evaluate stored data and to provide trending information.

A safe electrical interconnection box includes a rear wall, a front panel and a plurality of lateral walls extending between the rear wall and front panel so as to define an enclosed interior space. The front panel forms part of a cover which is movable sufficiently so as to provide an access opening into the enclosed interior space. At least one and typically three current probe attachment fixtures are located within the interior space, suggestedly mounted on a plate which itself is mounted within the box. Also provided are one or more socket-type electrical connectors with pin receiving holes mounted on the separate plate. Preferably, at least one connector is multi-holed and another is single-holed. In one example, the fixtures and multi-hole connector are coupled with a polyphase high voltage power supply connected through the cabinet with a polyphase high voltage electric motor. Individual leads are run in closed, current carrying loops through separate fixtures from the separate phases of the power supply either directly or typically through current transformers. Individual leads are extended from the separate phases of the power supply to the multi-hole connector in open circuit connections also either directly or through voltage transformers. The single-hole connector is coupled to ground.

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Darby, PA, United States of America

Louis Ricciuti, Jr