Electricity: electrical systems and devices – Safety and protection of systems and devices – Motor protective condition responsive circuits
Patent
1977-10-03
1979-07-03
Salce, Patrick R.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Motor protective condition responsive circuits
361 79, 361 93, 361 87, 324158T, H02H 7085
Patent
active
041602820
ABSTRACT:
A trolley wire for conveying direct current power to an electrically powered vehicle in an underground mine is connected in series with a shunt to a power source. The current drawn by the trolley wire passes through a circuit breaker and the shunt. The shunt generates a voltage input signal proportional to the current drawn by the trolley wire. A solid state comparator device receives the input signal and compares it to a reference signal having a magnitude representing the maximum level of current permitted to flow through the conductor. If the reference signal exceeds the input signal, the comparator device supplies an output signal that oscillates between a positive and a negative voltage to a trip circuit. The output signal actuates the operating coil of the circuit breaker so that the circuit breaker contacts remain closed to permit current to flow through the shunt to the trolley wire. Upon occurrence of an overcurrent, the input signal exceeds the reference signal and the comparator device responds by terminating the oscillating output signal to the trip circuit. Termination of the output signal deenergizes the circuit breaker operating coil. The circuit breaker contacts are then opened and current flow through the circuit breaker is terminated.
REFERENCES:
patent: 3332015 (1967-07-01), Barber
patent: 3492589 (1970-01-01), Rotier
patent: 3720131 (1973-03-01), Frohock, Jr. et al.
patent: 3733538 (1973-05-01), Kernick et al.
patent: 3742303 (1973-06-01), Dageford
patent: 3872354 (1975-03-01), Nestor et al.
patent: 3953767 (1976-04-01), Ahmed
Burr John F.
Dolinar Kevin D.
Adams John M.
Consolidation Coal Company
Mikesell, Jr. William A.
Price, Jr,. Stanley J.
Salce Patrick R.
LandOfFree
Overcurrent protection apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Overcurrent protection apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Overcurrent protection apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2277501