Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1978-05-01
1979-07-31
Stewart, David L.
Communications: electrical
Condition responsive indicating system
Specific condition
322 58, 322 99, 328165, 361 2, 361 20, H02K 1100
Patent
active
041632273
ABSTRACT:
Apparatus is described for monitoring arcing of brushes used in the transfer of current signals to and from the field of a generator. Electrical signals from the brushes, which are applied to the disclosed monitor for analysis, may include brush arcing signals to be monitored and in addition high-amplitude noise spikes in the same frequency band as the brush arcing signals, the noise spikes thus masking accurate detection of low level brush arcing by conventional devices. A two-stage clipping network is provided in the monitor to raise the brush arcing
oise ratio and thus mitigate the masking effect of the noise spikes without loss of a portion of sampling interval during which arcing may occur. Other features described as part of the brush monitor are discriminator diodes biased for constant threshold sensitivity to maintain arc detection accuracy over a wide range of ambient temperatures; an alarm system which functions to indicate and record the occurrence of brush arcing so that corrective action may be initiated to prevent serious damage to rotor slip rings and brush components; and a reference signal generator which automatically adjusts the level of reference signal used in the alarm system for changes in generator noise level.
REFERENCES:
patent: 3371266 (1968-02-01), Davidson
patent: 3381210 (1968-04-01), Shand
patent: 3653019 (1972-03-01), Barton
patent: 4058804 (1977-11-01), Sawada
Bishop James S.
Klementowski Frank M.
Sawada Fred H.
Ahern John F.
Austin Ormand R.
General Electric Company
Mitchell James W.
Stewart David L.
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