Matches 1 - 50 out of 162 1 2 3 4 >
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7368832 Circuit and fault tolerant assembly including such circuit  
A circuit is provided that provides for the same power characteristics to an assembly of electrical resistive elements wired in parallel as to the assembly as wired in series. An input power source...
7365951 Discharge lamp lighting device, lighting system and method  
A method and apparatus for protecting a discharge lamp lighting device from damage due to mis-wiring of a source of electrical power to the discharge lamp lighting device. The protection apparatus...
7365450 Current cutoff circuit and electric steering wheel lock  
An electric cutoff circuit for preventing overheating of a load. The current shutoff circuit includes an FET connected to a motor circuit. A relay fault detection circuit is connected to the motor...
7310049 Status indicator  
A status indicator indicates an operating state, including an electrical malfunction, of an electrical load that is located and controlled from locations remote from a monitoring location.
7304826 Fault management of high temperture superconductor cable  
A method and system for providing protection for a superconducting electrical cable located in a utility power network includes detecting a fault current on the superconducting electric cable,...
7245469 DC backup power supply device and method for diagnosing the same  
A reliable uninterruptible DC power supply device. The DC backup power supply device includes an AC/DC converter, a DC/DC converter, voltage step-up/down choppers and a battery connected to a DC...
7218493 Circuit breakers with integrated current and/or voltage sensors  
A circuit breaker ( 100 ), in particular a medium voltage circuit breaker, having a current ( 20 ) and/or a voltage measuring device ( 30 ) integrated thereon. The integration can be functional...
7191074 Electric power monitoring and response system  
An electric power monitoring and response system using electromagnetic field sensors located remotely beside the phase conductors. The system determines unknown system variables for one or more...
7090501 Connector apparatus  
A connector system includes a circuit board having a plurality of holes extending therethrough. First and second connector bodies, each having a front wall, are positioned on first and second sides...
7042690 Power-line, differential, isolation loss detector  
In one embodiment, an integrated differential isolation loss detector is disclosed that generates a first temperature that is a function of a high side current and a second temperature that is a...
6985800 Protection of an electric power transmission network  
For the control of an electric power transmission network, where local protection functions are implemented by a plurality of local protection devices ( 3,3 a, 3 b, 3 b′ ,3 c ) located at a...
6900971 Power supply device  
A power supply device for an electronic protection unit for AC/DC low- and/or medium-voltage power networks, comprising: first electronic means, which are suitable to transduce electric...
6684134 Electrical fault protection system  
A fault protection system whose trip logic considers power magnitude and direction at first and second points on a conductor is provided. Under normal operating conditions, power flows in the same...
6671151 Network protector relay and method of controlling a circuit breaker employing two trip characteristics  
A network protector relay controls a circuit breaker connected between polyphase feeder and network busses. A circuit samples polyphase circuit breaker current and network voltage to generate...
6654216 Distributed monitoring and protection system for a distributed power network  
A distributed monitoring and protection system for a distributed power network. The system includes a plurality of high-speed measuring units (MUs), wherein each MU is coupled to a power line to...
6646843 Short circuited semiconductor switch detection  
A method and apparatus are provided for detecting a short circuited semiconductor switch. The apparatus comprises a semiconductor switching device and a short circuited switch detection device. The...
6496342 Distributed monitoring and protection system for a distributed power network  
A distributed monitoring and protection system for a distributed power network. The system includes a plurality of high-speed measuring units (MUs), wherein each MU is coupled to a power line to...
6426856 Method for monitoring a protective gear  
A method of operating a protective gear is described, in particular a remote protective gear for an electric power grid. In this method, a voltage signal is derived from the line voltage, and a...
6201675 Monitoring system for a power distribution system and a method of operation thereof  
For use in a power distribution system having first and second output power feeds having corresponding first and second circuit protection devices associated therewith, a monitoring system and a...
6038117 Power switching apparatus  
A power switching apparatus is disclosed which has an electrical conductor to which high voltage can be applied. A series of circuits formed by a switching point and a current-limiting element...
6028754 System for preventing undesired protective relay tripping actions due to coupling capacitor voltage transformer transients  
The system impedance ratio (SIR) is determined for the original zone 1 distance element reach of a protective relay. The reduction in the original zone 1 reach is then determined, using the SIR...
6002260 Fault sensor suitable for use in heterogenous power distribution systems  
A fault sensor suitable for use in a heterogenous power distribution system executes a stored program and causes sufficient information to be collected to distinguish a source of fault current as...
5982598 Protective circuit for a grounded power plant  
For use with a grounded power plant, capable of powering a load, having a power supply and a power distribution system, a protective circuit, including a voltage clamping device, coupled between a...
5973899 Automated power feeder restoration system and method  
A feeder restoration method starts in response to an overcurrent fault on a feeder (22) that causes a circuit breaker (42) to trip open, reclose once, trip again, and attempt to reclose again....
5969925 Fire-initiation-protected power distribution system  
An arrangement for transmitting electric power from a source point to a load point comprises (i) a first sensor to monitor the amount of power being supplied from the source point, (ii) a second...
5962934 Arrangement for electrical power supply  
An arrangement for supplying electrical power to at least one load arranged along a power supply line, preferably in motor vehicles, is characterized by having a power supply facility that has at...
5956220 Adaptive distance protection system  
An adaptive distance relaying system provides improved performance for parallel circuit distance protection. The system utilizes the parallel circuit's current, when available, in conjunction with...
5940260 Apparatus and method for distributing electrical power  
The present invention relates to an apparatus and method for distributing electrical power from power substation circuits. The apparatus of the present invention is responsive to overcurrent...
5920129 Uninterruptible power supply having solid state transfer switch and method of operation thereof  
An uninterruptible power supply (UPS) for supplying DC power to a load and a method of providing uninterruptible DC power to a load. In one embodiment, the UPS includes: (1) a first stage rectifier...
5839093 System for locating faults and estimating fault resistance in distribution networks with tapped loads  
Both fault location and fault resistance of a fault are calculated by the present method and system. The method and system takes into account the effects of fault resistance and load flow, thereby...
5831805 Local power failure detection and clock disabling circuit  
A local power failure detection and clock disabling circuit operates within a node coupled to a bus structure. The node includes multiple ports and physical connections for supporting multiple...
5790418 Adaptive polarizing memory voltage time constant  
At least two different time constants are used to produce the polarizing memory reference voltage which in turn is used in a protective relay for power transmission lines. For most conditions, a...
5784238 Coordinated cluster tool energy delivery system  
A coordinated cluster-tool energy distribution system provides a systems level approach to supplying all process energy needs for such industrial applications as those found in the semiconductor...
5701226 Apparatus and method for distributing electrical power  
The present invention relates to an apparatus and method for distributing electrical power from power substation circuits. The apparatus of the present invention is responsive to overcurrent...
5619392 Method and device for protecting busbars  
In a busbar protection method and a corresponding device, the maximum values of the currents in the outgoers are determined. The maximum values Ikmax of the current characteristics are extended by...
5602709 High impedance fault detector  
A method and apparatus for detecting high impedance faults and other arcing phenomena in an electrical distribution system. Electrical signals on the distribution system are monitored and a number...
5600526 Load analysis system for fault detection  
To prevent unnecessary power outages, and to remove feeder lines from service only when certain hazardous fault conditions occur, a load analysis system including an apparatus and method, monitors...
5565783 Fault sensor device with radio transceiver  
A method and a fault sensor device (1) which can detect and distinguish abnormal current and voltage events on an alternating current overhead and underground transmission line or distribution line...
5543995 Method and apparatus for protecting a power transmission line  
Method and apparatus for preventing reclosing of circuit breakers to reconnect a transmission line when a break fault occurs in the transmission line. A voltage at a fault point is estimated from...
5513061 Apparatus and method for distributing electrical power  
The present invention relates to an apparatus and method for distributing electrical power from power substation circuits. The apparatus of the present invention is responsive to overcurrent...
5479315 Protective relay for power systems capable of being tested with low-level voltage and current signals  
The relay includes an input module capable of receiving 70 volt and 5 amp signals, respectively, from conventional instrument transformers, which are responsive to power line signals at their...
5400205 Breaker fail-safe system for a multi-channel electric power generating system  
A nonvolatile fail-safe system providing protection from bus fault propagation for a multi-channel electric power generating system includes a controller which provides excitation control and...
5400203 Short circuit detector and isolator  
An isolation circuit, which draws essentially zero current in a normal or stand-by state, uses a normally closed relay in combination with a storage element. A capacitor can be used as the storage...
5390067 Phase selection for ground fault  
A method and a device for phase selection for single-pole tripping of high-impedance ground faults in direct grounded power networks. Starting from the ratio of the negative-sequence voltage to the...
5375026 Method and device for preventing overstabilization of longitudinal differential protection in case of internal fault  
A method and a device for preventing overstabilization of longitudinal differential protections in case of internal faults on power lines, which may take place when a fault situation, which is...
5367425 Method and device for preventing understabilization of longitudinal differential protection in case of external fault and current transformer saturation  
A method and a device for preventing understabilization of longitudinal differential protections in case of external faults and current transformer saturation. The invention comprises an extension...
5349490 Negative sequence directional element for a relay useful in protecting power transmission lines  
A directional element measures the negative sequence voltage and the negative sequence current and from those quantities produces a scalar quantity related to the negative sequence impedance of a...
5343155 Fault detection and location system for power transmission and distribution lines  
A system for detecting and locating faults on a power system includes the e of fault detection and transmitting devices on each pole of the system. The fault detection apparatus includes detecting...
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...
5335135 Fault recording system for an electric power trip unit  
A low voltage electric power monitoring and circuit breaker system includes two processors. The first processor activates the circuit breaker when an overcurrent condition is detected and the...
Matches 1 - 50 out of 162 1 2 3 4 >