Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1984-04-30
1986-06-10
Heyman, John S.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307200A, 307354, 361 92, H03K 1722
Patent
active
045945179
ABSTRACT:
The loss of an AC supply voltage is detected by sensing the amplitude of the AC voltage relative to the reference potential about which it periodically goes positive and negative. Whenever the amplitude of the signal is below a given threshold, a sub-threshold signal is produced and its duration is sensed. If its duration is shorter than a predetermined sampling period, the sub-threshold signal is treated as a normally occurring signal and is filtered out of the system. If its duration exceeds the predetermined sampling period, it indicates that the AC voltage has remained "low" for too long a period of time, and an error signal is generated.
REFERENCES:
patent: 4165491 (1979-08-01), Geffon
patent: 4394702 (1983-07-01), Boothe
patent: 4420789 (1983-12-01), Breen
patent: 4490632 (1984-12-01), Everett et al.
Cohen William R.
Gillberg James E.
Haas George E.
Heyman John S.
RCA Corporation
Schanzer Henry I.
Tripoli Joseph S.
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