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Match Document Document Title
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...
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...
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...
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...
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...
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...
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...
3995200 Ground monitor and circuit breaker actuating device  
A ground monitor and circuit breaker actuating apparatus for monitoring the continuity of the ground and pilot conductors in a power distribution system and for deenergizing the power supply system...
3971007 Line isolation monitor  
A line isolation monitor for detecting faults of lines isolated from ground in which a constant current generator generates an electrical signal having one or more frequencies near the power line...
3956639 Ground monitor for electrical apparatus  
Apparatus to monitor the continuity of grounding circuits of an electrical machine. The apparatus measures the resistance in the grounding and pilot circuits and deenergizes the electrical machine...
3949272 Ground-fault protective scheme for multiple-source electric distribution system  
A ground-fault protective scheme for a three-phase electric distribution system that comprises two sources having neutral points that are interconnected by a neutral conductor and a separate ground...
3938006 Active negative sequence cable monitor  
A ground conductor break in a polyphase A.C. cable having a separate power conductor and an equal number of symmetrically spaced ground conductors for each phase is detected by sensing...
3934176 Safety apparatus for assuring proper grounding of mining machinery or the like  
Safety control apparatus of substantially improved reliability and sensitivity is provided for detecting faults and automatically deenergizing electrically powered mobile or portable equipment,...
3895264 Ground connection monitoring apparatus for mobile machines  
Apparatus protected against ground faults for monitoring the ground connection between a grounded power source and a mobile machine provided with multi-phase power through a multi-conductor...
3891894 Means for monitoring the safety of a remote electrical ground connection  
The invention contemplates safety monitoring of the condition of a remote electrical ground with reference to a given base end, as in application to elongate flexible trailing cable of the...
3806764 GROUND FAULT RESPONSIVE PROTECTION SYSTEM  
A multi-zone ground fault responsive protection system having three interlocked ground fault responsive subsystems each having a ground fault sensor, a circuit interrupter and an interrupter trip...
3771020 GROUND WIRE MONITORING CIRCUIT  
A ground wire monitoring circuit particularly adapted for use in connection with mining machinery that is supplied wither alternating current through a flexible cable from a power source remote...
3746929 GROUND CONTINUITY CHECKING SYSTEM  
A fail-safe ground conductor continuity monitoring circuit including means for inserting a low-level monitoring current into a ground conductor and receiver means for sensing if the level of...
3729653 GROUND CONDUCTOR CONTINUITY CHECKING CIRCUIT  
In a fail-safe ground conductor continuity monitoring circuit, including means for inserting a low-level monitoring current into a ground conductor and receiver means for sensing if the level of...
3728582 GROUND CONTINUITY MONITORING SYSTEM  
In a system which delivers electrical power to remotely located electrical equipment, such as mining equipment, through power conductors in a cable extending from a main source of power to the...
Matches 1 - 50 out of 75 1 2 >