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| Number | Title | Issue Date |
| 8134371 | Signal generating circuit for detecting ground status A signal generating circuit for detecting ground status includes a power supply input unit (A), a step down rectified power supply or DC power supply unit (C) in series. The DC power supply required by a signal detection and process unit (D) is obtained by the power... | 03/13/2012 |
| 8081001 | Device, system and method for automatic self-test for a ground fault interrupter A self-test circuit is provided that includes a signal circuit adapted to periodically output a circuit inhibitor signal to inhibit a breaking signal from a ground fault detector. The signal circuit is also adapted to periodically output a test signal simulating a g... | 12/20/2011 |
| 8067942 | Method for locating phase to ground faults in DC distribution systems A method for locating phase to ground faults in DC distribution systems. The method includes utilizing wavelet analysis using Multi-Resolution Analysis (MRA) as a signal processing tool for recognition of characteristic features in the voltage signal. The voltage si... | 11/29/2011 |
| 8040139 | Fault detection method for detecting leakage paths between power sources and chassis A method of detecting a ground fault condition between a direct current power system and the chassis ground of an electric or hybrid-electric vehicle is provided. The method includes sequentially opening and closing a first switch connected between a positive node o... | 10/18/2011 |
| 8018235 | Methods and apparatus to facilitate ground fault detection with a single coil and an oscillator Methods and apparatus to facilitate ground fault detection with a single coil and an oscillator are disclosed. An example ground fault detection device includes a sense coil including a secondary winding surrounding a line conductor and a neutral conductor, the line... | 09/13/2011 |
| 8013612 | Ground fault detection circuit for use in high voltage motor drive applications An integrated ground fault detection circuit in accordance with an embodiment of the present application includes a shunt resistor provided on a positive rail of a DC bus, a high voltage pocket including a sensory circuit connected to the shunt resistor and operable... | 09/06/2011 |
| 8004284 | Leak detecting circuit A leak detecting circuit includes: a current path having one end connected to a conductor housing a device supplied with a direct-current voltage from a direct-current power source, and having another end connected to a negative electrode of the direct-current power... | 08/23/2011 |
| 7973535 | Methods and apparatus to manage ground fault conditions with a single coil A ground fault detection device includes a sense coil including a primary winding and a secondary winding to detect current in a line conductor and a neutral conductor. It also includes a capacitor in parallel with the secondary winding and a virtual inductor to for... | 07/05/2011 |
| 7965085 | Differential-mode current sensor Systems, methods, and devices are disclosed, including a ground-fault sensor that has a plurality of conductors each disposed one inside of another except for an outer conductor and a field sensor configured to sense an electric field, a magnetic field, or both. In ... | 06/21/2011 |
| 7965086 | Differential-mode current sensor method Systems, methods, and devices are disclosed, including a ground-fault sensor that has a plurality of conductors each disposed one inside of another except for an outer conductor and a field sensor configured to sense an electric field, a magnetic field, or both. In ... | 06/21/2011 |
| 7944213 | Ground fault detection device A device and method to determine the presence of a ground fault that distinguishes between the capacitive portion of the currents to ground, and the resistive portion of the currents to ground by ascertaining aspects of the voltage and residual current waveforms. | 05/17/2011 |
| 7940055 | Power line diagnostic system An apparatus including a monitoring unit, a number of sensor units, a number of cables, and a number of thermoelectric generators. The number of sensor units is capable of making measurements at a number of locations on a number of power lines for a number of loads.... | 05/10/2011 |
| 7940054 | System and method to zero-sequence verify ground return path integrity by comparing measured zero-sequence current in an autotransformer with a second zero-sequence current source A ground return path is determined to be impaired when no zero-sequence current is measured in the neutral return path, but zero-sequence current is detected in other suitable measuring points that include the windings of an autotransformer, or in a magnetically cou... | 05/10/2011 |
| 7834636 | Methods and apparatus to facilitate ground fault detection with a single coil A ground fault detection device includes a sense coil including a primary winding and a secondary winding to detect current in a line conductor and a neutral conductor. It also includes a capacitor in parallel with the secondary winding and a virtual inductor to for... | 11/16/2010 |
| 7804303 | Apparatus and method for detecting a brush liftoff in a synchronous generator rotor circuit An apparatus and method detects an open condition of a grounding path provided by a rotor grounding brush electrically connecting a rotor body of a rotor to electrical ground. The rotor includes an insulated field winding wrapped around the rotor body and is configu... | 09/28/2010 |
| 7791351 | Method for detecting electrical ground faults A method of testing live AC circuits for neutral-ground, neutral-isolated ground, and isolated ground-ground faults, involves measuring impedances of circuit portions, including hot-neutral, neutral-ground, neutral-ground and isolated ground loops. In general either... | 09/07/2010 |
| 7768268 | Verification of a ground connection fabrication process for ESD resistors in magnetic heads Test methods and components are disclosed for testing the quality of the ground connection fabrication process for ESD shunt resistors in magnetic heads. A wafer is populated with one or more test components along with magnetic heads. The test components are fabrica... | 08/03/2010 |
| 7741853 | Differential-mode-current-sensing method and apparatus Systems, methods, and devices are disclosed, including a ground-fault sensor that has a plurality of conductors each disposed one inside of another except for an outer conductor and a field sensor configured to sense an electric field, a magnetic field, or both. In ... | 06/22/2010 |
| 7728600 | System and method for determining location of phase-to-earth fault A method, system and apparatus for determining a distance of a phase-to-earth fault on a three-phase electric line (30), the apparatus (40) being configured to determine a first estimate value for a distance between the measuring point (40) and ... | 06/01/2010 |
| 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 a synchronous three-phase electrical machine. The ground fault detect... | 05/18/2010 |
| 7714587 | Systems and methods for detecting a faulty ground strap connection Systems and methods are disclosed for detecting a faulty ground strap connection for a machine hosting a high voltage system. In one embodiment, a fault detection and compensation system includes a ground strap, a DC power supply electrically referenced to a machine... | 05/11/2010 |
| 7710122 | Ground resistance test apparatus The “Ground Resistance Test” provides a circuit and test setup for measuring the resistance of earth grounds. The ground resistance test uses the central office battery from a working telephone pair to source current into the “Tested Ground”. First the quies... | 05/04/2010 |
| 7679370 | Controller having discrete driver circuitry connected to a single processor port A controller having discrete driver circuitry for driving an electrical load and a method are provided. The controller includes a microprocessor having ports configurable to operate as inputs or outputs. The controller also includes discrete driver circuitry connect... | 03/16/2010 |
| 7629794 | Leakage detection circuit and battery electronic control unit A leakage detection circuit includes a branch having a body ground, a protective resistance, a switch element, a detection resistance, and a variable power supply that are coupled in series. A low voltage side of the variable power supply is connected to a negative ... | 12/08/2009 |
| 7626396 | Systems and methods for electrical leakage detection and compensation Systems and methods are disclosed for compensating electrical leakage and detecting balanced electrical leakage for a machine hosting an HV system. In one embodiment, a fault detection and compensation system includes a DC power supply electrically referenced to a m... | 12/01/2009 |
| 7626397 | High current capable circuit testing closer apparatus and method A circuit testing closer may include a fault isolating switching device coupled between a supply side and a load side of a power distribution system and a current pulse generator coupled in parallel to the switch to generate a current pulse within the power distribu... | 12/01/2009 |
| 7595644 | Power-over-ethernet isolation loss detector An AC generator has a first terminal coupled through an Isolation Loss Detect (ILD) capacitor to the positive bus of a Power-Over-Ethernet (POE) system, and has a second terminal coupled through the primary of a transformer to earth ground. AC current flowing betwee... | 09/29/2009 |
| 7592815 | Leakage detection circuit for electric vehicle A leakage detection circuit for an electric vehicle includes a battery pack, first and second leakage detection switches, a controller, a leakage detection resistor, a voltage detector, and a calculator. The first and second leakage detection switches are connected ... | 09/22/2009 |
| 7554333 | Grounding detector A grounding detector includes a coupling capacitor connected at one end to an output terminal of a power supply and at another end to a measuring point, a voltage detector to detect a voltage amplitude generated at the measuring point, a pulse generator to generate ... | 06/30/2009 |
| 7538557 | Arc fault and ground fault circuit interrupter tester apparatus and method Circuit tester apparatuses for identifying arc fault and/or ground fault current leakage on an electrical circuit. The circuit tester apparatuses may have two or three pairs of tester lead wires for connection to the electrical circuit. The tester lead wires are mou... | 05/26/2009 |
| 7528610 | Load break detection circuit A load break detection circuit for detecting a break in a load connected to an output terminal of an output circuit includes a target voltage generator, a reference voltage generator, and a comparator. The reference voltage generator generates a reference voltage an... | 05/05/2009 |
| 7525317 | Real-time multi-point ground resistance monitoring device A real-time multi-point ground resistance monitoring device is provided herein to simultaneously monitor ground resistances of different work stations. The present invention mainly contains a number of monitoring ports connected to multiple test ground points in par... | 04/28/2009 |
| 7501830 | Method, apparatus and computer-readable code for detecting an incipient ground fault in an electrical propulsion system Method, apparatus and computer-readable code are provided for detecting a location of an incipient ground fault in an electrical propulsion system. The apparatus may include a sensor configured to sense a respective ground leakage signal associated with a ground of ... | 03/10/2009 |
| 7498820 | Method, apparatus and computer-readable code for detecting an incipient ground fault in an electrical propulsion system Method, apparatus and computer-readable code for detecting an incipient ground fault. The apparatus includes a sensor for sensing a ground leakage signal. The apparatus further includes a correlator that receives the ground leakage signal, and at least one signal in... | 03/03/2009 |
| 7498818 | Apparatus and method for detecting a brush liftoff in a synchronous generator rotor circuit An apparatus and method detects an open condition of a grounding path provided by a rotor grounding brush electrically connecting a rotor body of a rotor to electrical ground. The rotor includes an insulated field winding wrapped around the rotor body and is configu... | 03/03/2009 |
| 7498819 | Method, apparatus and computer-readable code for detecting an incipient ground fault in an electrical propulsion system Method, apparatus and computer-readable code are provided for detecting a location of an incipient ground fault in an electrical propulsion system. The apparatus may include a sensor configured to sense a respective ground leakage signal associated with a ground of ... | 03/03/2009 |
| 7456635 | Circuit arrangement comprising a multi-wire line for supplying current and emitting signals A circuit arrangement with a multi-wire line for supplying current to a sensor and for emitting a signal that corresponds to a measured value to an evaluation module via a signal line. To eliminate measuring errors caused by short circuits, first and second resistor... | 11/25/2008 |
| 7443643 | Inverter device for automobile An object is to provide an inverter device for an automobile capable of detecting a ground fault with simple circuitry, and in summary, the inverter device has an inverter (inverter module) which generates an AC output from a battery loaded on a vehicle body to driv... | 10/28/2008 |
| 7428132 | Protection device with lockout test The present invention is directed to a protective device including a plurality of line terminals and a plurality of load terminals configured to be connected to at least one load. A test circuit is coupled to the plurality of line terminals and the plurality of load... | 09/23/2008 |
| 7368830 | Polyphase power distribution and monitoring apparatus A polyphase power distribution and monitoring apparatus having sets of outputs for each phase of power and monitors for each phase of power disposed in the housing. Each monitor provides a visible display of current for an associated phase of power and an audible al... | 05/06/2008 |
