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Match Document Document Title
8180481 Autoloop system and method of operation  
A system and method for operating an autoloop system on an electrical distribution system is provided. The system includes a first branch circuit having a first recloser and a midpoint recloser and...
8107205 Current differential relay  
An output unit outputs a trip current based on current amount data obtained by sampling a current amount at a first end of a power line at a predetermined timing and current amount data received...
7885043 Remote-operable micro-electromechanical system based over-current protection apparatus  
The present invention provides a remote operable over-current protection apparatus. The apparatus includes control circuitry integrally arranged on a current path and a micro electromechanical...
7872447 Electrical storage apparatus for use in auxiliary power supply supplying electric power from electric storage device upon voltage drop of main power supply  
In an electrical storage apparatus including an electric storage device connected between a main power supply and a load, a first bypass FET and a bypass diode which are connected in series between...
7860615 Method and apparatus for control of an electric power distribution system in response to circuit abnormalities  
A methodology and related system apparatus is provided to most efficiently and flexibly respond to abnormalities to reconfigure and restore service to end customers in commodity distribution...
7725295 Cable fault detection  
A cable fault detection component (168) receives input data indicative of a fault in an electrical power system. The component (168) analyzes the input data to determine if the fault is indicative...
7696647 Coupling node  
A coupling node for regulating the current flow between two or more drives is described. The coupling node may include an interconnect circuit in communication with the drives for selectively...
7542256 Relay device and corresponding method  
A method of operating a relay device, the method comprising the steps of: providing main circuit-breakers and a bus-tie-breaker connecting the main-circuit-breakers; defining a...
7154722 Loop control for distribution systems  
The invention contemplates a technique for providing loop control on a faulted overhead or underground loop system, while preventing restored current from being fed or back fed into the fault. In...
7126800 Method and system for communications channel delay asymmetry compensation using global positioning systems  
A method for compensating for communications channel delay asymmetry in a current differential protection system includes determining an apparent sampling clock offset for a communications channel,...
7119459 Intelligent switch for connecting power to a load  
A switching circuit includes a microchip which, in response to a signal from a signal switch, controls the operation of a power switch which, when closed, connects a load to a battery. The...
6937134 Reception of protection commands in a remote tripping device  
In order to receive protection commands in a remote tripping device, one or more signals is or are received, protection commands and combinations of protection commands are coded by means of an...
6701221 Method and apparatus for preventing excessive heat generation in a alternator of a generator set  
A method and apparatus are disclosed for preventing damage to an alternator of a genset resulting from high currents within the alternator. The method includes calculating, at a processor, a first...
6678134 Digital protective relay system  
A digital protective relay system is capable of making sampling timing the same among plural protective relay device which operate independent from each other by using a signal from a GPS...
6650031 Protective system for a solar module  
The invention relates to a system for protecting a solar module against theft or unauthorized use by an authorized consumer. Said system comprises an interruption device on the solar module side...
6628496 Protection system for an electricity network having a data transmission radio link  
The digital protection system for a high voltage electricity network to instruct circuit breakers to open in the event of faults being detected by current and/or voltage sensors on the network...
6469629 Distributed logic in multiple protective relays  
A protective relay, system, and relay operation method which allows logic functions to be distributed amongst multiple protective relays associated with a power distribution system. The protective...
6459998 Sensing downed power lines  
In systems embodying the invention, a “downed” power line is detected by sensing whether there is an open circuit along the power line and producing an indication that an open circuit condition exi...
6356422 Circuit breaker communication and control system  
A circuit breaker system 10 (FIG. 1) using electronic trip units 35 is disclosed. The electronic trip units 35 are coupled to a communications bus 30 whereby the electronic trip units 35 can be...
6297939 Zone selective interlock for a circuit breaker system  
A circuit breaker system 10 using electronic trip units 35. The electronic trip units 35 are coupled to a communications bus 30 whereby the electronic trip units 35 can be reconfigured, controlled,...
6243244 Method for automated reconfiguration of a distribution system using distributed control logic and communications  
A system and method which detects and responds to abnormalities in a distribution system by reconfiguring nodes of the system to minimize the effects of the abnormality without the requirement of...
6212049 Load center monitor for electrical power lines  
A load center monitor (10) is disclosed for monitoring and analyzing data gathered by electronic circuit breakers (40) in a power distribution system and communicated to the load center monitor...
6195243 Method and apparatus for adaptive configuration and control in a network of electronic circuit breakers  
A system including a load center monitor (10) connected to a plurality of digitally enhanced circuit breakers (40) by a communication bus (26) forms a network of reconfigurable circuit breakers...
6160690 Distribution control system and distribution control method capable of isolating fault section without fail  
A distribution control system that can isolate a fault section without fail, even if control of load break switches becomes impossible because of a communication error between a control center and...
6157527 Load center monitor and digitally enhanced circuit breakers system for electrical power lines  
A method of communicating data with a plurality of electronic circuit breakers operatively connected in a power distribution system is disclosed and claimed herein. Each circuit breaker includes a...
6144305 Electronic apparatus  
An electronic apparatus is provided that can eliminate unlawful cartridges while preventing a malfunction by checking whether there is a short-circuit of pin terminals at the time of turning on the...
6008971 Fault protection arrangement for electric power distribution systems  
A fault protection arrangement for electric power distribution systems includes a plurality of power sources connected to a distribution bus through circuit breakers and a plurality of loads...
6005758 Communication terminal for electrical power line distribution system  
A communication terminal (10) is coupled to and operable in a power line network with at least one of plurality of intelligent circuit breakers (40) wherein each such circuit breaker (40) has a...
6005757 Electrical switching device or trip unit acquiring predetermined settings from another electrical switching device or trip unit  
A first trip unit for interconnection with a second trip unit includes current transformers and potential transformers for sensing current, voltage and frequency conditions of a circuit breaker's...
5999389 Repeater for bus with bus fault isolation  
A repeater for a communication network having an isolation circuit for disabling the transmission of a fault-indicative signal through the repeater onto the network. A retriggerable one-shot starts...
5940263 Power capacitor bank switching devices  
A device is disclosed for connecting a plurality of capacitors between a first and a second terminal. The device includes a plurality of bus bars located in a parallel spaced apart relationship. A...
5905616 Load selectivity system for use with electronic trip circuit breakers  
A circuit breaker interconnect arrangement and a method for selective interruption of electrical circuits includes at least one upstream circuit breaker having an upstream electronic trip unit and...
5786699 Test method and apparatus for testing a protective relay system  
A relay test apparatus for testing a protective relay operation of a protective relay system comprises GPS receivers, respectively connected to the protective relays, each GPS receiver analyzing...
5631795 Line fault monitoring apparatus  
The present invention relates to a line fault monitor for detecting a short circuit in a terminal-side loop line and disconnecting the short-circuit portion from a power supply, so that the...
5608327 Methods and apparatus for identifying faulted phases on an electric power transmission line  
The invention provides method and apparatus for identifying the faulted phases on the occurrence of a single phase fault simultaneously on both circuits of a double circuit electric power...
5574611 Service interruption minimizing system for power distribution line  
Upon the occurrence of a fault on the first distribution line, a faulty section on the distribution line is pinpointed, then a tie point switchgear at the tie point between the first distribution...
5514894 Protection circuit device for a semiconductor integrated circuit device  
A protection circuit structure for an internal semiconductor integrated circuit. The protection circuit structure includes a first protection circuit having at least a first input pin and a first...
5399803 Valve stack for high voltages having fire screen means located between valve modules  
A valve stack for high voltages includes a number of electrically interconnected valve modules, some of which are disposed one above the other. To prevent a large fire in a valve module from...
5341268 Method of and system for disconnecting faulty distribution line section from power distribution line  
A main controller installed in a distribution substation of an electric power system sends a request signal to each of section controllers installed in individual section switches upon detecting a...
5329414 Protective relay interface  
A protective relay communication interface includes a transformer having primary windings arranged as, at least two, sets of opposed windings. The interface is connected to a local relay sensing a...
5309312 Overcurrent protection relay with communications  
An apparatus for protecting an electrical power system supplying electrical power to an electrical load comprises a transformer for sensing an operating condition of the electrical power system and...
5303112 Fault detection method and apparatus  
Method and apparatus are provided responsive to the circuit parameters at one or more locations of an electrical power transmission and/or distribution network for detecting protective device...
5267231 Digital communication channel interface  
A differential protective relay system includes protective relays 19A and 19B at the terminals of a protected transmission line segment 21. Analog signals QL1 and QL2 are sampled at the respective...
4972290 Electric power system with remote monitoring and control of protective relays  
Monitoring and control of analog electromechanical protective relays and digital mcroprocessor based relays is integrated through a system including slave stations which record and time tag contact...
4939617 Method and apparatus for monitoring an AC transmission line  
The invention is directed to an improved method and apparatus for monitoring the status of an AC electrical transmission line connected between first and second locations. In a disclosed embodiment...
4922368 Method and apparatus for detecting and discriminating faults in transmission circuits  
Discriminating circuits are coupled to receive signals from a protected transmission circuit. Each discriminating circuit also receives from a direction detector signals indicating whether any...
4835651 Loss-of-potential supervision for a distance relay  
Loss-of-potential supervision for a distance relay controlling a circuit breaker in a poly-phase electric power transmission system is provided by blocking circuit breaker trip signals in the...
4782421 Electrical supply line protection apparatus  
Teed circuit protection is provided by a master unit at one terminal and slave units at the other terminals with broad band communication links between the master unit and the slave units. All...
4760488 Transmission control apparatus for duplex loop type transmission system  
This invention relates to a duplex loop type transmission system which is so constructed that a plurality of transmission stations are loop-connected with two transmission lines, and the control...
4751604 Comparison signal error detector for protective relay system  
A protective relay, for use in protecting a predetermined protected zone of a three phase alternating current electrical power transmission line, the relay being of the type which receives a...
Matches 1 - 50 out of 115 1 2 3 >