Electrical transmission or interconnection systems – Plural supply circuits or sources – Connecting or disconnecting
Patent
1976-10-18
1978-10-17
Schaefer, Robert K.
Electrical transmission or interconnection systems
Plural supply circuits or sources
Connecting or disconnecting
361 89, H02J 300
Patent
active
041211111
ABSTRACT:
Solid stage apparatus for the detection of synchronism between line and bus voltages in order to permit safer interconnection therebetween is disclosed. A first comparator circuit constantly monitors the magnitude of the vector difference between the line voltage and the bus voltage and generates a first enabling signal whenever the magnitude of the vector difference voltage is below a predetermined value. The first enabling signal will continue to be generated until the magnitude of the vector difference voltage rises above the predetermined value. A second comparator circuit monitors the relative magnitudes of the line and bus voltages and generates a second enabling signal whenever a high bus-dead line or a dead bus-high line circuit occurs. The second enabling signal will continue to be generated as long as one of these conditions exist. The enabling signals are applied to a time delay circuit. If either enabling signal is applied to the time delay circuit for a predetermined time period, the time delay circuit will generate an output signal which enables a connection between the bus and line.
REFERENCES:
patent: 3069556 (1962-12-01), Apfelbeck et al.
Ginsburg Morris
Gould Inc.
Schaefer Robert K.
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