Other

Central Moloney, Inc.

Lloyd D Miller

Robert E Jordan

The internal fault indicator includes an open ended housing mounted in an opening in the wall of a transformer casing. An indicator lens is attached over a first open end of the housing and a diaphragm is attached over a second open end of the housing with the second end of the housing being positioned so that the diaphragm is subjected to internal pressure surges within the transformer. The diaphragm carries a trigger retainer which engages a trigger on an indicator shaft mounted for rotation within the housing. An indicator is mounted on the indicator shaft beneath the lens, and a bias spring is connected to the indicator shaft to bias the shaft toward rotation relative to the housing when the trigger is engaged with the trigger retainer. When the diaphragm moves in response to a pressure surge in the transformer, the trigger retainer moves away to release the trigger, and the bias spring rotates the indicator shaft and indicator so that a warning section on the indicator is positioned for viewing through the lens.

Internal fault indicator for a transformer

A system for monitoring the operation of a plurality of rotating-shaft machines, including a switchable meter to indicate the shaft speed of any one of these machines. Each machine has a monitoring circuit including respective visual warning branch circuits to indicate if the machine shaft falls below a first preset speed and then to indicate if the machine shaft falls below a second preset speed, with provision for sounding an audible alarm. The system has a single power supply, switchable meter, audible alarm control circuit and warning reset circuit, and identical monitor modules for the respective machines to be monitored. Each module has an external sensor, consisting of a pickup coil and a magnet assembly attached to the rotating shaft of the monitored machine; a high-gain integrated circuit amplifier to amplify the pulses from the sensor; circuitry to convert the pulses to a D.C. voltage proportional to shaft speed; visual warning and alarm lamps; a switch to connect the audible alarm to the module or optionally to disconnect it; separate high-gain integrated circuit amplifiers to control the indicating meter, visual warning, and visual/audible alarm; and multi-turn potentiometers, accessible from a common front panel to control sensitivity, speed range, meter circuit gain, and set points in percent of normal speed for the warning and alarm circuits.

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Pine Bluff, AR, United States of America

Lloyd D Miller