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8159792 Motor control device  
In a motor control device that drives a plurality of motors with one DC power supply, detection of a short circuit fault occurring in the motors is realized with an inexpensive configuration. In...
8144442 Power protection in a multi-level power hierarchy  
Embodiments of a multi-level power hierarchy are described. This power hierarchy contains a higher level, which includes a first sub-circuit, and a lower level, which includes a second sub-circuit...
8120504 Circuit for indicating operating status of computer hardware devices  
A circuit for indicating operating status of a plurality of hardware devices of a computer includes a detecting module, a decoding module, and an indicating module. The indicating module includes a...
8054598 Negotiating capacity allocation among distributed current protection devices  
Exemplary systems, apparatus, and methods relate to a current limiting device on each of two or more load branches that limits the current drawn by each load branch to a branch current allocation...
8054593 Apparatus and method for measuring load current using a ground fault sensing transformer  
A circuit that includes a single grounded fault sensing transformer coupled to a resonant circuit that produces an output signal used by a microcontroller to determine a load current flowing...
8050878 Method and system for estimation of source impedence on electrical distribution lines  
A device and method for dynamically determining an impedance of a network is disclosed. The device includes at least a processing system for measuring a network voltage and network current when...
8045302 Compressor protection and grid fault detection device  
A compressor monitoring system includes current and voltage monitors, current and voltage averaging modules, a control module, and a switch. The current monitor measures a current drawn by a motor...
7990093 Electric motor control apparatus  
A control apparatus for a multiphase AC electric motor having an inverter includes a current control including an abnormal-state current controller; an abnormal-state detector that detects an...
7974058 Group protection module for a switchgear arrangement and switchgear arrangement having such a group protection module  
A group protection module for a switchgear arrangement is provided in order to protect a group of load feeders, each having a contactor for connecting or disconnecting a respective load. The group...
7936545 Power supply control system  
A power supply control system having a first switch circuit configured to set a power supply line which connects a power supply unit and a power supply circuit to one of a connected state and a...
7764478 Power supply control system  
The present invention provides a power supply control system comprising a first switch circuit configured to set a power supply line which connects a power supply unit and a power supply circuit to...
7751993 Technique for high-impedance ground fault detection at the common DC bus of multi-axis drives  
Systems and methods for detecting ground fault at the common DC bus in a high impedance ground system. A fault detection component can detect characteristics of an electrical signal including phase...
7747354 Circuit protection system  
A circuit protection system is provided that provides dynamic zones of protection for the circuit. The zones of protection can be based in part upon the topology of the circuit. The protection...
7732940 Apparatus and method for reducing neutral line current using load switching method  
An apparatus for reducing a neutral current using a load switching method in accordance with the present invention includes a phase current detection unit for detecting a phase current in each of a...
7660088 System, apparatus and method for compensating the sensitivity of a sequence element in a line current differential relay in a power system  
An apparatus and method compensate for the sensitivity of at least one line current differential element of a first current differential relay providing differential protection for a transmission...
7652862 Hardware based over-current protection circuitry for power distribution systems  
A power distribution unit that switches off power outlets in the event of an over-current condition by using circuitry that measures how long input current has exceeded a threshold and sending a...
7626791 Electrical fault detection  
A DC electrical current busbar associated with electrical load circuits and devices as well as sources requires protection. In order to provide such protection Kirchoff's laws are utilized such...
7612972 Electrical contractor current sensing system and method  
A current sensing module is provided for contactors and similar switch gear. The current sensing module is packaged so as to be capable of mounting on a line or a load side of a contactor. The...
7579963 Electronic protection devices for circuit-breakers and corresponding programming method  
A protection device for circuit-breakers that comprises a wireless communication system for transmitting locally, to a dedicated computerized device, information corresponding to measurements of...
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...
7344202 System and method for dealing with ground fault conditions that can arise in an electrical propulsion system  
A method and system is provided for detecting and performing diagnostics regarding an incipient ground fault that may occur in an electrical propulsion system of a traction vehicle, such as a...
7342759 Power supply unit having a mains suppression filter for an electrically operated domestic appliance  
A central power supply device for an electric supply of a domestic appliance and an electronic control unit of the appliance is connected to an output side of an interference suppression filter....
7324006 Remote display ammeter for power plug or power strip  
A power strip is providing including a housing coupled to a first end portion of a power supply cord, the housing having an electrical receptacle mounted thereto and connected to the power supply...
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,...
7253629 Circuit protection device with grounded neutral half cycle self test  
The present invention is directed to a circuit and method for self-testing a protection device for use in an AC power distribution system. The device is configured to be coupled between an AC power...
7208883 Current detection circuit, and power supply apparatus, power supply system and electronic apparatus using the current detection circuit  
In the current detection circuit that detects the output currents of a switching power supply circuit, an improved current detection circuit makes it possible to detect the output current...
7196884 Apparatus and method for detecting the loss of a current transformer connection coupling a current differential relay to an element of a power system  
Disclosed is an apparatus and method for detecting a loss of a current transformer connection coupling a protective relay to a power system element of a three-phase power system and providing a...
7183735 Drive unit for controlling drives in machine tools or production machines  
A drive unit for controlling drives of machine tools or production machines includes a signal electronics unit, a startup/diagnostic unit, and an interface between the signal electronics unit and...
7180717 Electrical network protection system  
Protection systems for electrical systems are described, where the electrical systems may include spot networks and/or grid networks. The various protection systems may be designed and used to...
7132951 Apparatus and method for protecting an uninterruptible power supply and critical loads connected thereto  
An apparatus and method for monitoring and controlling a backup power source and one or more critical loads powered thereby is disclosed. The apparatus is constructed in the form of an electrical...
7116239 Current sense components failure detection in a multi-phase power system  
An evaluator (210) having an input (207) for receiving a signal indicative of a channel current sensed via a sensor in a mutlichannel current sharing system, and circuitry (313, 319) coupled to the...
7079365 Electrical fault detection system  
A microcontroller-based system to detect ground-fault and grounded-neutral conditions in a monitored circuit of an electrical distribution system having line and neutral conductors. The system...
7075764 Method and arrangement for reducing stress in electrical network  
A method and arrangement for reducing stress in an electrical network. In the method and arrangement, an inrush current caused by a network component or part connected to the live electrical...
7067940 Submarine branching unit having asymmetrical architecture  
A branching unit for use in submarine systems that includes a ground termination; first, second, and third cable terminations each coupled to a power feed line of a respective submarine cable; a...
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...
7026728 System for supplying electrical power to a load by a transmission path which has been split into two parts  
The system is intended to provide an isolated power supply for an electrical load. It contains a generator for producing a supply signal, and a transmission path having two separate branch...
6940702 Electrical protection system  
Protection systems for electrical systems such as substation power dividers are described. The protection systems may be designed and used to detect and clear faults that may occur within the...
6778368 Electrical service distribution board  
An electrical service distribution board is accommodated in a housing, has a feed conductor that is inserted into the housing and has outgoer conductors that lead to individual loads. Electrical...
6772077 Electric arc monitoring systems  
Electric arc monitoring is effected by exploiting the discovery that electric arcs are fractal phenomena in that all essential information that signifies “arc” is contained in each fractal sub...
6725130 Method, apparatus and control logic for damage reconfiguration of an electro-mechanical system  
In an electro-mechanical distribution system having plural units each comprising a valve/switch and dual sensors, a computer is associated with each unit so as to process sensor information and...
6710989 Method apparatus, and system for sensing a power change during operation of a microelectronic device  
A sense circuit and a system including a sense circuit are disclosed. The sense circuit is configured to measure and change in current with respect to time and/or a change in voltage across a...
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...
6635974 Self-learning power management system and method  
A method and system for controlling power to a cranking subsystem in a device having a power source is disclosed. The method and system include providing at least one switch and providing at least...
6625550 Arc fault detection for aircraft  
An arc fault detector system detects arcing faults in an electrical distribution system by monitoring one or more conductors and producing an input signal representing one or more electrical signal...
6614635 Circuit provided with a protective function  
A protective circuit arrangement includes at least two power contactors that have main make contact elements arranged in enable circuits. Each main make contact element of a power contactor is...
6539287 Distribution control system capable of isolating fault section without using time limited sequential shift function  
A distribution control system includes in each of feeder terminal units a controller that updates a value in a latest current value storage area of a memory, every time a current value is detected...
6525917 Power transforming system and method  
This invention is to provide a transforming system capable of satisfactorily protecting the equipment of a substation even if a aerial electric power lines is struck directly by an intense electric...
6501631 Method and device for power system protection  
A method for protecting a zone in a power system, which has a number of transmission lines connected to power sources and a number of transmission lines connected to a number of loads, where the...
6490141 Power distribution system  
A power distribution system includes circuits each having an electronic circuit breaker as a protection for short-circuits and/or overloads, and a clocked power supply unit. The clocked power...
Matches 1 - 50 out of 195 1 2 3 4 >