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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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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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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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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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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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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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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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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