BRUSHLESS GENERATOR FIELD GROUND DETECTION SYSTEM

摘要

A ground detection apparatus for detecting and warning of a ground condition in the rotating field windings of rotating electrical machinery. A plurality of light emitting diodes mounted for rotation with the rotating field of an electrical machine transmit light energy as they rotate. A control circuit also mounted for rotation with the rotating field and connected to the light emitting diodes causes the light emitting diodes to change their energy transmission state upon a ground in the rotating field windings. Light sensitive sensors are mounted in a fixed nonrotating position so as to receive the light energy transmitted by the light emitting diodes and produce an output signal upon such receipt. The light sensitive sensors are connected through signal conditioning circuits to an alarm. The alarm provides an indication of a grounded field winding condition after the grounded condition has been maintained for a predetermined time.