Electricity: electrical systems and devices – Safety and protection of systems and devices – Series connected sections with faulty section disconnect
Patent
1978-03-03
1979-08-14
Salce, Patrick R.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Series connected sections with faulty section disconnect
361115, 361187, 361191, H02H 726
Patent
active
041647734
ABSTRACT:
A transfer trip circuit has a first station which contains a circuit breaker and a source of control current in which the control current is increased from a first value to a second value in response to the operation of the circuit breaker. A second station is connected to the first station by a pair of pilot wires which carry the control current. The second station contains a circuit breaker which is to be operated in response to the operation of the circuit breaker in the first station, and also contains two relay coils which carry the control current produced in the first station. The first relay coil operates an annunciator when the control current is below its first value to indicate a fault in the pilot wires. The second relay coil operates the trip circuit of the circuit breaker in the second station when the control current in said pilot wires is increased to said second value.
REFERENCES:
patent: 1698337 (1929-01-01), Leeson et al.
patent: 1953108 (1934-04-01), Harder
patent: 2882455 (1959-04-01), Ferguson, Jr.
patent: 3676739 (1972-07-01), Neuhouser
patent: 4023153 (1977-05-01), Adachi
Gould Inc.
Salce Patrick R.
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