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| Number | Title | Issue Date |
| 4853820 | Electronic circuit breaker systems Electronic circuit breakers safeguard a load connected to a power supply against damage from overload conditions. These circuit breakers interrupt flow of overload currents to the load by instantaneously reducing flow of such current from the power supply... | 08/01/1989 |
| 4845594 | Reclosing relay with nonvolatile memory of operations A reclosing relay for use in an electrical power system with a circuit breaker for clearing line faults by tripping and reclosing. The breaker has auxiliary contacts defining the state of the circuit breaker as open or closed. The reclosing relay includes... | 07/04/1989 |
| 4798969 | Power feed system in transmission line between terminals of three-terminal station A transmission line between terminals of a three-terminal station is branched by a branching unit and power is transmitted between the terminals of the three-terminal station and a power feed system in the transmission line including: a switch for switchi... | 01/17/1989 |
| 4739226 | Dimming circuit having switching transistor protection means A dimming circuit adjusts the light output of a lamp by controlling the current flow in the lamp that is connected to a transistor, through turning on and off the transistor with a predetermined timing which is changed by the control signal from a control... | 04/19/1988 |
| 4724391 | Method for determining the time of reclosing a circuit breaker and device for carrying out this method A method for reclosing a temporarily opened circuit breaker in a manner which assures that generation of unwanted overvoltage stresses is avoided during the reclosure process. An oscillating line voltage typically develops in a shunt-compensated line afte... | 02/09/1988 |
| 4605981 | Industrial or domestic overvoltage protective device The device includes two detectors of overvoltage (8, 9) each connected between a respective one of a pair of power line conductors (1, 2) and a respective input of an arrester (7). The outputs of the detectors are connected to an OR-gate (10) the output s... | 08/12/1986 |
| 4597025 | Minimum size, integral, A.C. overload current sensing, remote power controller An A.C. overload current sensing, remote power controller of minimum size and weight and integral construction. Current rate sensing wound toroids are used that are small enough to fit around the line terminal studs without having to enlarge the prior ins... | 06/24/1986 |
| 4562506 | Distribution line powered switchgear control A distribution line powered switchgear control is provided which reliably initiates switchgear operations with stored energy. Stored energy is preferably maintained in a plurality of devices including a power capacitor. The power capacitor is preferably c... | 12/31/1985 |
| 4553188 | Sectionalizer A method of isolating a spur line of an electrical power system protected by a multi-shot resetting circuit breaker wherein at least two successive current surges in the spur line which activate the circuit breakers are detected. In response to the detect... | 11/12/1985 |
| 4538197 | Synchronism check relay A synchronism check relay includes both a high set and a low set slip cut-off circuit. The low slip cut-off setting is based upon the maximum slip frequency that can be tolerated and still allow reclosing. The high slip cut-off setting is a function of th... | 08/27/1985 |
| 4535409 | Microprocessor based recloser control A microprocessor based recloser control has a microcomputer for causing trip and close operations of a recloser in response to the conditions of the power distribution lines being protected and operator commands. The microcomputer may be overridden by a m... | 08/13/1985 |
| 4516183 | Overcurrent relay An overcurrent relay comprises an input transformer (7), a rectifying circuit (8), a level detecting circuit (9) for providing an operation signal (S1) when a direct current signal voltage (E) exceeds a predetermined value, a determining means ... | 05/07/1985 |
| 4484246 | Reclosing device for transmission line When the positive-phase voltage of one terminal of a transmission line involved in a fault detected by a positive-phase relay exceeds a predetermined value, an output is supplied to the reclosing instructing device from an AND circuit to first reclose thi... | 11/20/1984 |
| 4454556 | Timing controller for a recloser relay A timing controller which supervises the reclosure of a fault responsive circuit breaker which includes a plurality of selectable switches for developing signals representing the reset and reclose delay times for the recloser relay operatively associated ... | 06/12/1984 |
| 4454555 | Voltage sensing and load measuring automatic reclosing system for d-c circuit breakers A reclosing system for d-c feeder circuit breakers used on transit systems is disclosed. Circuit breaker closure is prevented when the feeder circuit voltage is in a predetermined voltage range and when the feeder circuit impedance is less than a given va... | 06/12/1984 |
| 4394702 | Power failure detection and control circuit A circuit is provided for detecting a low power condition which is undesirable and effectively turns off a computer system to prevent incorrect operation thereof. The circuit does not turn on the computer system until the correct power condition is achiev... | 07/19/1983 |
| 4356526 | Control circuit for resetting drawout circuit breaker UVR solenoid A control circuit utilizes a system voltage monitoring control relay for applying a DC control voltage across a UVR solenoid and a voltage dropping resistor to maintain the UVR in its reset condition in the absence of an undervoltage condition. An RC netw... | 10/26/1982 |
| 4344101 | Testers A circuit tester is disclosed which automatically open-circuits a main lead to an input circuit in response to an excessive overcurrent. The circuit tester of the present invention will automatically sense the existence of an excessive current which, in t... | 08/10/1982 |
| 4293886 | Network protector relay A network protector relay produces a close signal entirely from sequence components based on the magnitude and phase relationships between the positive sequence component of the phase-to-ground voltages on the network side of the protector and the positiv... | 10/06/1981 |
| 4266258 | Current limiting device for high voltage switching mechanisms A device for quickly reconnecting two portions of a current carrying line after separation of the line portions through actuation of a circuit breaker includes a second circuit breaker and a serially connected switch connected in parallel with a primary c... | 05/05/1981 |
| 4263635 | Method and apparatus for sensing the clearance of fault current on an ac transmission line A method and apparatus for sensing the clearance of a fault current on an ac transmission line and providing a fault cleared signal for closing a current limiter bypass switch includes the technique of successively sensing half cycles of current magnitude... | 04/21/1981 |
| 4223365 | Auto resetting switchgear trip indicator circuits A trip indicator circuit for a circuit interrupter of an electric power system, which includes an electromagnetic status indicator, having an indicator which is movable between an indicating position and a non-indicating position, a pulse-actuated set coi... | 09/16/1980 |
| 4202023 | Overload protector A rapid-response overload protector interposed between a voltage source and a load powered thereby, the protector effectively decoupling the load from the source when the current drawn thereby exceeds a predetermined limit indicative of an overload condit... | 05/06/1980 |
| 4183071 | Control circuit for resetting circuit breaker UVR solenoid DC control voltage derived from the system voltage activates a first relay to apply the control voltage across a dropping resistor and an undervoltage release (UVR) solenoid, thereby holding the UVR solenoid in while the system voltage remains above a min... | 01/08/1980 |
| 4146829 | Battery dissipation limiter circuit A circuit which protects a battery powered, pulse controlled, constant current power supply from excessive power dissipation. Voltage controllers disconnect the power supply from an associated battery, a predetermined time after current flows in the power... | 03/27/1979 |
| 4041540 | Solid state overload relay circuit A self-powered solid state overload relay circuit having current transformers energized by conductors supplying current to a multiphase alternating current motor. The transformers have secondary windings connected to charge a capacitor with a voltage indi... | 08/09/1977 |
| 3991366 | Means for indicating abnormal high current flow in a high voltage electric power distribution conductor and for resetting and testing same An indicator for flow of fault current in a conductor is enclosed in a housing carrying a metallic clamp for detachable mounting on the conductor. The indicator is operated by closure of a switch in response to flow of fault current in the conductor and i... | 11/09/1976 |
| 3968410 | Static overcurrent relays A solid state protective device is disclosed which monitors an electric quantity such as current or its negative phase sequence component in a protected circuit and which responds to abnormal increases in the value of that quantity by activating a circuit... | 07/06/1976 |
