System and method for detecting arcing in dynamoelectric machine

Details System and method for detecting arcing in dynamoelectric machine System and method for detecting arcing in dynamoelectric machine

1988-06-23

1989-08-01

Jennings, Derek S.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

361 6, 361 23, 324546, 340658, 340660, H02H 700

Patent

active

048538183

ABSTRACT:
System and method for detecting arcing faults in a dynamoelectric machine by monitoring the neutral lead of the machine for a radio frequency voltage produced by arcing, providing a warning signal in response to a change in the radio frequency voltage, and providing a shutdown signal in response to a radio frequency voltage greater than a predetermined level. An RF voltage coupler is capacitively coupled ot the neutrla lead, and a radio frequency monitor connected to the voltage coupler detects peaks in the RF voltage.

REFERENCES:
patent: 3710242 (1973-01-01), Povey
patent: 3801899 (1974-04-01), Liao
patent: 3882379 (1975-05-01), Kang
patent: 4156846 (1979-05-01), Harrold et al.
patent: 4237415 (1980-12-01), Easley
patent: 4356443 (1982-10-01), Emery
patent: 4446426 (1984-05-01), Emery et al.
patent: 4771355 (1988-09-01), Emery et al.

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