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8174804 Circuit breakers with ground fault and overcurrent trip  
A circuit breaker apparatus may be used to interrupt overcurrent and ground fault in a circuit. The circuit breaker apparatus may include an overcurrent coil for tripping the circuit breaker...
8064174 Leakage current detection and interruption circuit with improved shield  
A circuit is disclosed for disconnecting a power source upon the detection of a leakage current comprising a power cable having an insulated first and a second wire. The power cable has a...
8045303 Building service ground fault interrupter  
A ground fault interrupter to be used by utility company while effecting repairs to the electrical service for a building is positioned to interrupt the power supply to the building in case of a...
8022709 Method and apparatus for determining circular characteristic  
A method and a system for determining a circular characteristic for distance protection of a three-phase electric line, the system comprising means for detecting a fault on the electric line, means...
8018697 Ground fault protection circuit  
A switching circuit, e.g. an RCD, comprises a pair of mechanical contacts (M) in an alternating current electricity supply (N, L) and circuit means (SCR) for opening the contacts to cut off the...
7948722 Differential protection device  
A differential protection device comprising: differential current measuring means,processing means connected to the measuring means and comprising operating rating selection means and time delay...
7835120 Circuit breakers with ground fault and overcurrent trip  
A circuit breaker apparatus may be used to interrupt overcurrent and ground fault in a circuit. The circuit breaker apparatus may include an overcurrent coil for tripping the circuit breaker...
7764473 Method of detecting a ground fault and electrical switching apparatus employing the same  
A circuit breaker includes for each neutral and phase power conductor, a current sensor sensing an alternating current flowing in a corresponding power conductor, a comparator determining whether...
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...
7719285 Ground fault detection  
The present invention relates to a ground fault detection arrangement for a synchronous three-phase electrical machine, and an electrical system comprising a ground fault detection arrangement and...
7636224 Method and safety device for ground fault circuit  
The invention refers to a method and an apparatus (1) for protecting people against leakage currents while using appliances such as home appliances or the like. The apparatus (1) is provided with a...
7633728 Arc fault circuit interrupter and method of parallel arc fault detection  
An arc fault circuit interrupter includes separable contacts, an operating mechanism, a current sensor sensing current flowing through the contacts and outputting a sensed current, and a processor...
7633727 Arc fault circuit interrupter and series arc fault detection method using plural high frequency bands  
A circuit interrupter includes band pass filters cooperating with a current sensor to output bands having different, non-overlapping ranges of frequencies, peak detectors cooperating with the...
7558033 Arc fault circuit interrupter and method of parallel and series arc fault detection  
An arc fault circuit interrupter includes separable contacts, a neutral conductor, an operating mechanism structured to open and close the separable contacts, at least one current sensor structured...
7538647 Ground fault circuit interrupter device  
A ground fault circuit interrupter device is described.
7440246 Circuit interrupting apparatus with remote test and reset activation  
The present disclosure relates to resettable circuit interrupting devices and apparatus capable of being tested and reset from remote locations, and in particular to portable circuit interrupting...
7205668 Multi-layer printed circuit board wiring layout  
A multi-layer printed circuit board (PCB) includes a first wire layer, a middle layer above the first wire layer, a second wire layer above the middle layer, and a slanting via formed in the middle...
7184251 Power supply with internally limited outputs for use in lighting systems for direct mounting onto a junction box  
A power supply assembly for a lighting system is directly mountable onto a standard electrical junction box. The power supply circuit provides an electronically power limited output through...
6625001 Directional tap  
In a directional tap, a splitting circuit receives a video signal from an input port and outputs a distributed video signal corresponding to the video signal from the input port at each of multiple...
6567256 Dual protective relay for power systems  
The relay obtains three-phase current signals from two power line sources thereof, typically two independent feeder lines. The two sets of signals are processed by a single processing means, which...
6465979 Series compensation of electric alternating current machines  
A method and device for providing series compensation for rotating electric alternating current machines connected either directly, or via a static current converter, to a three-phase distribution...
6437700 Ground fault circuit interrupter  
A signaling system employing indicator lamp means and an audible alarm is employed to remind a user to periodically test his GFCIs and to provide information regarding the status of the GFCI. The...
6188552 High resistance grounding systems for oil well electrical systems  
A normally ungrounded power system for a oil well is provided which includes a power transformer above ground and a pump motor below ground. There is provided a signal system which includes a below...
5947768 Power distribution system isolator  
A power distribution system isolator is provided including a trailer having a hitch and a pair of wheels for transportation purposes. Also included is an electrical assembly with a fuse and a pair...
5894393 Aircraft ground power loss of neutral and over-voltage detector  
A ground fault and over-voltage detector and method is disclosed for sensing a loss of neutral continuity between the respective neutral conductors of a ground power unit and an aircraft power...
5587864 Short circuit and ground fault protection for an electrical system  
A three-phase electrical system includes an interrupt controller. The interrupt controller protects against inadvertent current flow between a phase conductor and ground and between phase...
5548465 Leakage voltage inductor  
A leakage voltage inductor serves as an electrical safety protection device used to send an instant alarm or to cut off the power when a leakage is detected in an electric appliance, the device...
5548466 Hazardous ameprage recognition and relaying techniques  
The present invention is directed to a system for sensing fault current flowing through a person who touches an exposed conductor in a cable connecting a machine to a power distribution center...
5400204 System for detecting a breakage of a power cable for an elevator system  
System For Detecting A Breakage Of A Power Cable For An Elevator System Which can accurately detect the breakage of at least one copper wire in the respective power cables present between the...
5309311 Electrical apparatus for differential current protection  
An electrical apparatus for magnetothermal and differential protection, of the type comprising a device for sensing differential currents associated with a magnetothermal protection switch,...
4949362 System for detecting and limiting electrical ground faults within electrical devices  
An electrical ground fault detection and limitation system for employment with a nuclear reactor utilizing a liquid metal coolant. Elongate electromagnetic pumps submerged within the liquid metal...
4933802 Gas insulated switchgear system having single phase reserve bus  
A gas insulated switchgear system having two gas insulated switchgear equipments, each of which consists of first disconnecting switches, circuit breakers, and second disconnecting switches, three...
4882646 Protective grounding and referencing arrangement for high voltage bulk supply  
A protective grounding and referencing arrangement for a high-voltage, high-energy bulk supply is provided in the present invention. Isolation from ground is provided through the use of an...
4783713 Full automatic electric shock protector apparatus  
An electric shock protector apparatus includes a circuit for detecting an electric shock current signal which has a frequency substantially higher than the line frequency of a power distribution...
4707759 Universal fault circuit interrupter  
Improved shock and electrical-fire protection circuits provide line-to-ground plus "line-to-line" fault protection in a power system, and monitor conditions after protective interruption to safely...
4703195 Parallel grounding scheme  
Electronic system grounding includes two system grounding paths for card cage electronic modules, with a first grounding path through the card cage and a second grounding path through the system...
4649454 Apparatus and method for detecting an open ground connection  
An apparatus and method for continuously monitoring and detecting an open ground connection which may occur anywhere between the chassis of an electrical appliance and the grounding terminal of a...
4525764 System for disconnecting an electrical power source from a load  
In accordance with the present invention, an electrical system is provided for disconnecting a power source from a load when a voltage potential in excess of a predetermined threshold is detected...
4417114 Connector for attaching an electrical component to a flat sheet  
This invention relates to an arrangement for attaching discrete electrical components to a generally flat layer of sheet material. Both mechanical and electrical connections are provided by the...
4389694 Cable continuity monitoring system  
There is disclosed a monitoring system for insuring the continuity and integrity of a power distribution system comprising a plurality of trailing cables, each trailing cable connected at a central...
4368498 Ground conductor monitoring system  
Disclosed is a ground conductor monitoring system which makes efficient use of an audio signal to continuously check the continuity of at least the ground conductor of a cable system.
4363063 Load break switch with built-in ground fault sensing  
A plural phase high current low voltage load break switch with built-in ground fault sensing comprises an insulator base and a plurality of individual phase circuits mounted on and extending across...
4321643 Ground monitoring system  
An improved ground monitoring circuit for detecting the integrity and proper connection of the ground conductors in an electrical cable of an electrical power distribution system of a type that is...
4271444 Ground fault trip mode network for static trip circuit breakers  
The secondary currents of plural current transformers are applied to a full-wave rectifying network for developing an overcurrent signal and a ground fault current signal; the latter flowing in a...
4208689 Circuit breaker having an electronic fault sensing and trip initiating unit  
A circuit breaker having an electronic fault sensing and trip initiating unit which provides increased versatility and ability to coordinate the circuit breaker with other interrupting and...
RE30304 Ground fault protection system  
A conventional residential ground fault circuit interrupting (GFCI) device is utilized to control a traditional circuit interrupter in protecting a large power distribution circuit against ground...
4153923 Ground monitoring system and method  
A system for monitoring the continuity of at least the ground wire of a cable connected between a mining machine and a power center. At the power center, a monitor signal is coupled to multi-phase...
4110807 Continuity monitoring system  
Disclosed is a system for monitoring the resistance in the pilot and ground conductors of a power cable and for interrupting power if the resistance exceeds a predetermined limit established for...
4110808 Ground fault protection system for multiple source distribution networks  
Various embodiments of a ground fault protection system are disclosed for protecting a multiple source distribution network consisting of at least two sources having their neutral points...
4075675 Ground conductor monitoring system and method  
A system and method for monitoring the continuity of a ground conductor in a power transmission system. A plurality of power transmission cables extend between a power source and a load and include...
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