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| Number | Title | Issue Date |
| 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 devices and apparatus capable of being tested and reset from remote lo... | 10/21/2008 |
| 7323880 | Ground circuit impedance measurement Novel apparatus and method accurately measure ground circuit impedance. A ground circuit and electrical current source adjusted to 25 amperes or less simulate a ground fault. Ground impedance is determined by dividing voltage drop by amperage to determine impedance ... | 01/29/2008 |
| 7312965 | Aircraft applicable current imbalance detection and circuit interrupter and packaging thereof The aircraft applicable current imbalance detection and circuit interrupter interrupts an electrical circuit when a current imbalance is sensed. The current imbalance detection and circuit interrupter includes a housing, power supplies, a sensor for sensing a curren... | 12/25/2007 |
| 7268670 | Power line communications system A power line communications technique (PLC) is disclosed which allows communications across any three phase electric system by modulating the impedance through earth between any two points of differing voltage on the electrical system in order to use the power suppl... | 09/11/2007 |
| 7268989 | Arc fault circuit interrupter for a compressor load An arc fault circuit interrupter includes separable contacts electrically connected between line and load terminals, and a current sensor adapted to sense current flowing between the terminals and through the contacts. An arc fault detection circuit is adapted to co... | 09/11/2007 |
| 7212391 | Grounded isolation system An system and method are disclosed for isolating and grounding a load device, where grounding only occurs after the voltage(s) on the load device have been reduced to acceptable levels. The system includes power and grounding contacts, a sensing device, and a contro... | 05/01/2007 |
| 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 layer and the second wire layer. The manufacturing method includes t... | 04/17/2007 |
| 7173395 | Inverter unit grounding method and inverter unit A circuit system that includes a sensor circuit for a sensor that detects the state of a motor is provided in an inverter unit for driving the motor. A 0V of the circuit system is connected with a shield braid of a shielded cable that connects the sensor circuit and... | 02/06/2007 |
| 7167348 | Miniaturized motor overload protector A Digital Programmable Motor Overload Protector includes a base module and a detachable, removable user interface module interfaced through a serial communications link. The base module provides motor overload analysis through a programmable Digital Signal Processor... | 01/23/2007 |
| 7068040 | Ground circuit impedance measurement apparatus and method Novel ground circuit impedance measurement apparatus and method accurately measure ground circuit impedance. A ground circuit and electrical current source of 25 amperes or less simulate a ground fault. Ground impedance is determined by dividing voltage drop by ampe... | 06/27/2006 |
| 7057868 | Reverse current protection device A reverse current protection device includes one or more contactors in a power circuit that open to prevent current flow and close to allow current flow; an impedance buffer to invert voltage across the diode; a threshold detector to compare inverted voltage to a re... | 06/06/2006 |
| 7016171 | Current fault detector and circuit interrupter and packaging thereof A power controller is positioned within a current path between the line side and the load side of an electrical circuit. The power controller closes the current path in the presence of a control supply and opens the current path in the absence of the control supply.... | 03/21/2006 |
| 6975210 | Arrangement of an inductive coupler for power line communications There is provided an arrangement of components for use in a power line communication system. The arrangement includes (a) an inductive coupler having a core with an aperture through which a coaxial power cable is routed, where the coaxial power cable has a center co... | 12/13/2005 |
| 6975491 | Electrical ground protection device and method An apparatus and method for protecting against electrocution hazards that arise when an appliance is electrically connected to a miswired single-phase AC electrical source are described. Protection is provided against miswiring conditions that cause the putative gro... | 12/13/2005 |
| 6937450 | Grounded isolation system A system for electrically isolating and indicating electrical isolation of a machine including a plurality of relays which cooperate to, when electrical isolation is selected, ground voltage input lines to the machine thereby ensuring that no power is provided to th... | 08/30/2005 |
| 6933714 | Method and apparatus for measuring the impedance of an electrical energy supply system The invention relates to a method and an apparatus for measuring the impedance of an energy supply system at a rated frequency by impressing a testing current (3) into the system and measuring (4) the resulting changes in a system current and a system ... | 08/23/2005 |
| 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 directional output ends. Each of multiple directional out... | 09/23/2003 |
| 6618229 | Aircraft applicable current imbalance detection and circuit interrupter and packaging thereof The aircraft applicable current imbalance detection and circuit interrupter interrupts an electrical circuit when a current imbalance is sensed. The current imbalance detection and circuit interrupter includes a housing, power supplies, a sensor for sensi... | 09/09/2003 |
| 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 independently controls the circuit breakers associated wit... | 05/20/2003 |
| 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 or transmission network. The stator of the electric machin... | 10/15/2002 |
| 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 power lines that supply the GFCI with power are also couple... | 08/20/2002 |
| 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 ground sensor system and an above ground signal condition... | 02/13/2001 |
| 6043664 | Method and apparatus for turn fault detection in multi-phase AC motors A method for turn fault detection in a multi-phase alternating current machine includes obtaining instantaneous line-to-neutral voltages from each phase of the machine, calculating the sum of the line-to-neutral voltages, and using the sum to determine wh... | 03/28/2000 |
| 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 of cables each connected to the fuse for connecting to a p... | 09/07/1999 |
| 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 system coupled to the unit. The detector includes a feedback p... | 04/13/1999 |
| 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 conductors. The interrupt controller measures the voltage across a ... | 12/24/1996 |
| 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 wherein the power distribution center has a number of power ca... | 08/20/1996 |
| 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 being used to send the alarm and to cut off the power automat... | 08/20/1996 |
| 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 inverter of the elevator system and a linear motor moving eleme... | 03/21/1995 |
| 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, comprises a differential current sensor connected to an input of ... | 05/03/1994 |
| 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 coolant and electrical support equipment experiencing an in... | 08/14/1990 |
| 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 phase gas insulated buses which are respectively connected... | 06/12/1990 |
| 4899246 | Solid-state trip device comprising a zero sequence current detection circuit A signal representative of the zero sequence current is obtained from current transformers associated with each phase and with the neutral if applicable by separate summing, in two distinct conductors, of the positive half-wave currents and of the absolut... | 02/06/1990 |
| 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 isolation transformer connected between the a-c utility supply and... | 11/21/1989 |
| 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 system. The current of the power system is passed through a ... | 11/08/1988 |
| 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 provide automatic restoration of current when the fault is... | 11/17/1987 |
| 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 power supply. The two system grounding paths are used to min... | 10/27/1987 |
| 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 receptacle. The apparatus includes a plug having a groundin... | 03/10/1987 |
| 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 between a test point and a selected voltage reference point... | 06/25/1985 |
| 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 attachment elements of the present invention. One form of the... | 11/22/1983 |
