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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...
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7538647 |
Ground fault circuit interrupter device
A ground fault circuit interrupter device is described.
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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,...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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.
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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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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...
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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...
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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...
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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...
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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...
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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,...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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