With More Than Two Wires Patents (Class 361/46)
  • Patent number: 10096988
    Abstract: An apparatus (100) protects a device (80) which has a ferrous electromechanical component which saturates in a high magnetic field (40) and draws a dangerously high electric current. A current sensor (110) senses current in excess of safe operating conditions of the protected device (80) in or near the magnetic field (40). A current switch (120) is controlled by the current sensor (110) and interposed between a power supply (90) and the device (80) to interrupt the current flow to the protected device (80) when the current sensor (110) senses current flow above a threshold due to the saturation.
    Type: Grant
    Filed: October 12, 2012
    Date of Patent: October 9, 2018
    Assignee: KONINKLIJKE PHILIPS N.V.
    Inventor: Paul Wayne Bailey
  • Patent number: 10058707
    Abstract: The present invention relates to an electronic system for a system for neural applications, comprising at least one first connector element and at least one second connector element, the first connector element being configured such that the electronic system is directly and/or indirectly connectable or connected to a controller which is at least configured to supply and/or provide and/or measure at least one voltage and/or at least one current and/or at least one voltage waveform and/or at least one current waveform especially via one or more stimulation outputs and/or recording inputs, the second connector element being configured such that the electronic system is directly and/or indirectly connectable or connected to a lead for neural stimulation and/or recording, wherein the electronic system comprises at least one leakage current detection means configured such that a leakage current, especially a leakage current within and/or around the system for neural applications is detectable.
    Type: Grant
    Filed: December 18, 2013
    Date of Patent: August 28, 2018
    Assignee: Medtronic Bakken Research Center B.V.
    Inventors: Jeroen Jacob Arnold Tol, Egbertus Johannes Maria Bakker
  • Patent number: 9948087
    Abstract: The present invention is directed to a protective device configured to be coupled between an AC power source and an electrical load. A ground continuity monitor is coupled to the ground conductor, the ground continuity monitor being configured to detect a ground discontinuity condition in the ground conductor. A circuit interrupter mechanism is configured to interrupt electrical continuity in a tripped state and establish electrical continuity in a reset state. A self-test circuit is coupled to the ground continuity monitor and configured to perform a simulated ground continuity test that simulates the ground discontinuity condition. The self-test circuit provides a test failure signal when the ground continuity monitor fails to provide an output signal in response to the simulated ground continuity test. The test failure signal is configured to trip the circuit interrupter mechanism.
    Type: Grant
    Filed: March 11, 2013
    Date of Patent: April 17, 2018
    Assignee: Pass & Seymour, Inc.
    Inventors: Joshua Paul Haines, Kent R. Morgan, Brian Mueller
  • Patent number: 9853440
    Abstract: A ground detecting apparatus at least includes a metal oxide semiconductor field effect transistor and a high voltage resistor. The metal oxide semiconductor field effect transistor is used to replace a photo-coupler for switching. The high voltage resistor is used for safety isolation. A relay action detecting apparatus at least includes a metal oxide semiconductor field effect transistor and a high voltage resistor. The metal oxide semiconductor field effect transistor is used to replace a photo-coupler for switching. The high voltage resistor is used for safety isolation.
    Type: Grant
    Filed: August 6, 2015
    Date of Patent: December 26, 2017
    Assignee: DELTA ELECTRONICS, INC.
    Inventor: Ming-Whang Wang
  • Patent number: 9581648
    Abstract: A relay welding detector is adapted for detecting welding fault of a relay. The relay has a first electrical contact coupled to a neutral terminal of an alternating current (AC) power source through a first power line, and a second electrical contact coupled to a load through a second power line. The relay welding detector includes a signal generator generating a test signal, a current transformer wound with a portion of one of the power lines and generating an induced signal based on the test signal, and a determining unit determining, based on the induced signal, whether the electrical contacts of the relay are welded to each other.
    Type: Grant
    Filed: December 27, 2013
    Date of Patent: February 28, 2017
    Assignees: Lite-On Electronics (Guangzhou) Limited, Lite-On Technology Corp.
    Inventor: Zhi-Feng Wu
  • Patent number: 9312678
    Abstract: A surge protection device has a pulse controlled switch, a pulse generation circuit and an abnormal voltage detection circuit. The surge control switch is connected in series to a power line loop and has at least one control terminal respectively connected to output terminals of the pulse generation circuit and the abnormal voltage detection circuit. An output terminal of the abnormal voltage detection circuit is connected to the power line loop and is located in the back end of the pulse controlled switch. The pulse generation circuit serves to send a pulse to the pulse controlled switch to close the pulse controlled switch and connect to the power line loop. When continuously detecting abnormal voltage in the power line loop, the abnormal voltage detection circuit opens the pulse controlled switch and disconnects from the power line loop so as to protect back-end equipment or circuit.
    Type: Grant
    Filed: September 13, 2012
    Date of Patent: April 12, 2016
    Assignee: Cyber Power Systems Inc.
    Inventors: Yu-Jei Lin, Chia-Ming Chang, Ming-Tsai Kao
  • Patent number: 8810250
    Abstract: Various systems, methods and apparatus are described for detecting an excessive or faulty ground current in a conductive wire or electronic device. A ground current detector is coupled to a known earth ground to determine whether other ground lines are carrying excessive, faulty and/or leaking currents. If these types of unsafe conditions are detected, then a user can take appropriate action to locate and correct these problems.
    Type: Grant
    Filed: May 17, 2011
    Date of Patent: August 19, 2014
    Assignee: Echostar Technologies L.L.C.
    Inventors: Kirk Lenzie, Casey Gold, Vincent Nguyen, Sam Chaisitti
  • Patent number: 8749929
    Abstract: A circuit interrupter includes a trip actuator configured to cooperate with an operating mechanism to trip open separable contacts. The circuit interrupter also includes a ground fault sensor configured to sense a difference between a current through a first electrical conductor and a current through a second electrical conductor and to output an output current based on the sensed difference and a ground fault amplifier circuit configured to convert the output current to an output voltage. The circuit interrupter also includes first and second switches configured to electrically connect the output of the ground fault sensor to the ground fault amplifier circuit and the trip actuator, respectively. The circuit interrupter also includes a processor configured to control operation of the first and second switches and, when the first switch is closed, to control operation of the trip actuator based on the output voltage.
    Type: Grant
    Filed: December 17, 2012
    Date of Patent: June 10, 2014
    Assignee: Eaton Corporation
    Inventor: Theodore Miller
  • Patent number: 8717718
    Abstract: Electrical load controls are provided which include an electrical switch assembly and a fault protection device within a common housing. The switch assembly includes an actuator, and is responsive to actuation of the actuator to switch ON or OFF electricity to the load. The protection device automatically responds to a fault condition by overriding the switch assembly by automatically blocking electrical connection between phase input and output terminals and neutral input and output terminals of the load control. The actuator includes a single external interface element. In one embodiment, actuation of the actuator switches ON or OFF electricity via control of the fault protection device, and in another embodiment, movement of the interface away from the housing exposes within the housing an internal user interface for the fault protection device.
    Type: Grant
    Filed: April 11, 2011
    Date of Patent: May 6, 2014
    Assignee: Leviton Manufacturing Company, Inc.
    Inventors: Michael Kamor, Adam Kevelos
  • Patent number: 8537509
    Abstract: The present invention relates to a ground fault detecting and controlling method for a parallel-structured high voltage system, and more particularly, such a ground fault detecting and controlling method for a parallel-structured high voltage system, in which it can be more precisely determined whether or not the system operation is emergently stopped based on individual insulation resistance values for respective items of the system, and it can be determined whether there is the possibility of temporary operation of the system in the emergency stop situation of the system operation. According to the present invention, a combined insulation resistance ground fault reference value is calculated based on individual insulation resistance values for respective items of the system, and the entire system is controlled by using the calculated combined insulation resistance ground fault reference value such that a high-accuracy ground fault detecting and controlling method can be provided.
    Type: Grant
    Filed: March 29, 2011
    Date of Patent: September 17, 2013
    Assignee: Hyundai Motor Company
    Inventor: Sang Yon Yoon
  • Patent number: 8537510
    Abstract: For monitoring the isolation of an IT-grid with respect to ground, an inverter connecting a direct current side with an alternating current side of the IT-grid and a photovoltaic device on the direct current side of the IT-grid, at least one isolation resistance of the direct current side with respect to ground is monitored for falling below a resistance threshold value while the inverter is running, and additionally a leakage current via the inverter towards ground is monitored for exceeding a current threshold value.
    Type: Grant
    Filed: September 16, 2011
    Date of Patent: September 17, 2013
    Assignee: SMA Solar Technology AG
    Inventor: Reinhard Lehmann
  • Patent number: 8482887
    Abstract: A GFCI device with circuit condition detection function includes a leakage current detection circuit, a disconnect mechanism, a reset mechanism, a circuit condition detection and control circuit, and a selection switch. The disconnect mechanism includes a first SCR controlled by the leakage current detection circuit. The circuit condition detection and control circuit includes a first control circuit and a second control circuit. When the first control circuit is connected to an anode of the first SCR by the selection switch, it provides an intermittent simulated leakage current to the leakage current detection circuit, and the leakage current detection circuit provides a trigger signal for a control gate of the first SCR, so that the first control circuit generates an intermittent simulated leakage current. When the leakage current detection circuit is not operational to generate the trigger signal, the first control circuit generates a control signal to disable the GFCI device.
    Type: Grant
    Filed: November 7, 2011
    Date of Patent: July 9, 2013
    Assignee: Bingham McCutchen LLP
    Inventors: Cheng Li Li, Guolan Yue
  • Patent number: 8462471
    Abstract: The present invention provides a circuit interrupting device which comprises a leakage current detection and protection circuit containing a simulated leakage current generation circuit which is capable of automatically generating a simulated leakage current when the circuit interrupting device is properly wired and in a tripped state to automatically test the functions of the key components of the circuit interrupting device. The simulated leakage current generation circuit comprises a normally closed switch and a normally open switch. The leakage current detection and protection circuit further comprises a normal status indicator light and a power output indicator light to indicate whether the circuit interrupting device is working properly and/or reverse wired. The circuit interrupting device further comprises a reset switch, a pair of discharged metal pieces, and four pairs of circuit interrupting contacts.
    Type: Grant
    Filed: November 19, 2009
    Date of Patent: June 11, 2013
    Inventors: Huadao Huang, Huayang Lu
  • Publication number: 20130119933
    Abstract: In one implementation, a ground fault interrupt circuit is provided for a utility power connection to an electric vehicle charging unit. The ground fault interrupt circuit may include a gain amplifier having an input connected to be capable of receiving a differential current from a current sensing transformer and a comparator having an input connect to a reference voltage. It includes a rectifier circuit connected between the gain amplifier and the comparator with a charge accumulator circuit coupled between the rectifier and the comparator.
    Type: Application
    Filed: October 14, 2012
    Publication date: May 16, 2013
    Inventors: Albert FLACK, Scott BERMAN
  • Patent number: 8363364
    Abstract: A branch wire L5 from the voltage detection circuit 14 is inserted in the zero-phase-sequence current transformer ZCT in the direction from the load side to the external power supply side. For this configuration, the zero-phase-sequence current transformer ZCT is to detect unbalance of the sum of current flowing in the first and second conductive wires L1, L2 and the current flowing in the branch wire L5. Therefore, the present invention can accurately detect occurrence of electrical leakage.
    Type: Grant
    Filed: November 18, 2010
    Date of Patent: January 29, 2013
    Assignee: Panasonic Corporation
    Inventors: Hirotoshi Watanabe, Tatsuya Mukai, Shiro Mori, Naoki Fukuo, Kiyosi Gotou, Kouji Kakiuchi, Shinichi Nakamura
  • Patent number: 8331067
    Abstract: An apparatus and method for providing ground fault protection to a lifting device utilizing an electromagnet and powered by a generator. The apparatus and method rectifies an AC voltage emanating from the generator source and monitors unsafe operating conditions of the generator's circuit wherein operation of the lifting device is ceased when predetermined electrical operating parameters are exceeded.
    Type: Grant
    Filed: December 29, 2009
    Date of Patent: December 11, 2012
    Assignee: Ephaugh, Inc.
    Inventor: John Samila
  • Patent number: 8259423
    Abstract: An automotive vehicle includes a charge port integrated with the vehicle. The charge port includes electrical contacts configured to receive electrical power from an electric grid, and a fault interrupt circuit electrically connected with the electrical contacts.
    Type: Grant
    Filed: July 14, 2009
    Date of Patent: September 4, 2012
    Assignee: Ford Global Technologies, LLC
    Inventors: Allan Roy Gale, Michael W. Degner, Steven F. Chorian, Venkateswa Anand Sankaran
  • Patent number: 8174805
    Abstract: A residual current device for an AC electricity supply comprises a housing (10) and a first load conductor (L) inside the housing connected in series between the supply and a load and including a set of contacts (18) by which an electrical connection between the supply and the load may be made or broken. A current transformer is disposed inside the housing and has a toroidal core (TI) the first load conductor passing through the core and forming one primary winding of the current transformer. At least one further load conductor (N) outside the housing passes through the core (T) via an opening (32) in the housing and forms a further primary winding of the current transformer. A secondary winding (W) on the core produces an output in response to a residual current, and a circuit (RCC) inside the housing is responsive to the output on the secondary winding to open the contacts if the residual current is above a predetermined level.
    Type: Grant
    Filed: March 3, 2008
    Date of Patent: May 8, 2012
    Assignee: Tripco Limited
    Inventor: Patrick Ward
  • Patent number: 8174804
    Abstract: 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 apparatus, a voltage coil also for tripping the circuit breaker apparatus located proximate to the overcurrent coil, ground fault electronics connected to the voltage coil and structured to detect a ground fault in the circuit when the ground fault exceeds a threshold level, and a solid state switch. The ground fault electronics can be structured to send a trip signal to close the solid state switch when a ground fault is detected, the solid state switch is configured to force a current through the voltage coil when the solid state switch is closed, the current being of sufficient magnitude to trip the circuit breaker apparatus.
    Type: Grant
    Filed: November 12, 2010
    Date of Patent: May 8, 2012
    Assignee: Carling Technologies, Inc.
    Inventor: Michael Fasano
  • Patent number: 8139328
    Abstract: There is disclosed a circuit interrupting device with symmetrical inputs comprising a first input configured for connection to a power source or a load circuit and a second input configured for connection to a power source. There are a plurality of electrical conductors extending from the first and second inputs and a third input configured for connection to a load provided by a user. There is also a first set of transformers comprising at least one differential transformer and at least one neutral transformer connected to detect leakage current in a load circuit coupled to the first set of terminals. There is also a second set of transformers comprising at least one additional differential transformer and at least one additional neutral transformer connected to detect leakage current in a load circuit coupled to the second set of terminals.
    Type: Grant
    Filed: November 21, 2008
    Date of Patent: March 20, 2012
    Assignee: Levitron Manufacturing Company, Inc.
    Inventors: Nicholas L. DiSalvo, James A. Porter
  • Patent number: 8068318
    Abstract: An apparatus for ground fault current interrupter with overall end-of-life indication and shutdown protection function includes a first silicon-controlled rectifier, a reverse unit, a test switch unit and a ground fault current interrupter. The ground fault current interrupter includes a second silicon-controlled rectifier, a switch unit, a switch control unit and a rectifier filter unit. When a test current leakage signal is generated, a drive power is provided to the reverse unit, and the input power supply generates a current leakage phenomenon. If the ground fault current interrupter fails, then the second silicon-controlled rectifier will not be triggered, which makes the reverse unit trigger the first silicon-controlled rectifier, such that the rectifier filter unit outputs a DC power flowing through the first silicon-controlled rectifier to interrupt a power supply of the switch control unit.
    Type: Grant
    Filed: March 10, 2010
    Date of Patent: November 29, 2011
    Assignee: YFC-Boneagle Electric Co., Ltd.
    Inventors: Ying-Ming Ku, Yi-Huang Lee, Chih-Huan Wang
  • Patent number: 8064174
    Abstract: 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 conductive shield surrounding the first and second wires with a drain wire electrically contacting the conductive shield. A disconnect switch is interposed between the power source and the power cable. A primary circuit controls the disconnect switch. A secondary circuit is connected to the drain wire for sensing a leakage current between the conductive shield and one of the first and second wires. An optical switch interconnects the primary circuit and the secondary circuit for opening the disconnect switch upon the secondary circuit sensing a leakage current.
    Type: Grant
    Filed: August 11, 2009
    Date of Patent: November 22, 2011
    Assignee: Technology Research Corporation
    Inventors: Thomas S. Williams, Frank S. Brugner, Jr., Paul R. Gandolfi
  • Patent number: 8045303
    Abstract: 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 detected ground fault and utilizes a sensor for detecting the fault current at the service entrance to a building; a contact switch, selectively movable between open and closed positions, mounted for temporary use in series with said power supply to the building; and a microprocessor based circuit for measuring and evaluating fault current detected by the sensor and controlling the selective movement of the contact switch between its open and closed positions.
    Type: Grant
    Filed: May 6, 2009
    Date of Patent: October 25, 2011
    Assignee: The Von Corporation
    Inventors: Ricky Curl, Fred von Herrmann
  • Patent number: 8018697
    Abstract: 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 supply in response to a switching signal (S). The switching circuit includes further circuit means (Rs, Cs, D2, D3, Q1, Q2) for defining successive periods of time (“activation windows”) during which the magnitude of the supply voltage is not at a maximum and allowing the contacts to open in response to a switching signal only during such windows.
    Type: Grant
    Filed: February 7, 2007
    Date of Patent: September 13, 2011
    Assignee: Shakira, Limited
    Inventor: Patrick Ward
  • Patent number: 8018235
    Abstract: 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 conductor and the neutral conductor forming a primary winding. The example ground fault detection device also includes a voltage oscillator connected in series with the secondary winding to drive an oscillation component, and at least one of a detector or an amplifier connected in series with the secondary winding to detect at least one of a neutral-to-ground fault or a line-to-ground fault.
    Type: Grant
    Filed: October 24, 2007
    Date of Patent: September 13, 2011
    Assignee: Texas Instruments Incorporated
    Inventors: Artur J. Lewinski, Ross Teggatz, Thomas Edward Cosby
  • Patent number: 7969154
    Abstract: Various systems, methods and apparatus are described for detecting an excessive or faulty ground current in a conductive wire or electronic device. A ground current detector is coupled to a known earth ground to determine whether other ground lines are carrying excessive, faulty and/or leaking currents. If these types of unsafe conditions are detected, then a user can take appropriate action to locate and correct these problems.
    Type: Grant
    Filed: November 29, 2010
    Date of Patent: June 28, 2011
    Assignee: Echostar Technologies L.L.C.
    Inventors: Kirk Lenzie, Casey Gold, Vincent Nguyen, Sam Chaisitti
  • Publication number: 20110122536
    Abstract: A branch wire L5 from the voltage detection circuit 14 is inserted in the zero-phase-sequence current transformer ZCT in the direction from the load side to the external power supply side. For this configuration, the zero-phase-sequence current transformer ZCT is to detect unbalance of the sum of current flowing in the first and second conductive wires L1, L2 and the current flowing in the branch wire L5. Therefore, the present invention can accurately detect occurrence of electrical leakage.
    Type: Application
    Filed: November 18, 2010
    Publication date: May 26, 2011
    Inventors: Hirotoshi Watanabe, Tatsuya Mukai, Shiro Mori, Naoki Fukuo, Kiyosi Gotou, Kouji Kakiuchi, Shinichi Nakamura
  • Patent number: 7948722
    Abstract: 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 selection means to select tripping curves, actuating means, and test means connected to the measuring means. In the protection device the test means are associated with the operating rating selection means and with the time delay selection means to select a minimum or reduced operating rating and to select a minimum or reduced time delay when said test means are actuated.
    Type: Grant
    Filed: November 27, 2007
    Date of Patent: May 24, 2011
    Assignee: Schneider Electric Industries SAS
    Inventor: Mustapha Chelloug
  • Patent number: 7852090
    Abstract: Various systems, methods and apparatus are described for detecting an excessive or faulty ground current in a conductive wire or electronic device. A ground current detector is coupled to a known earth ground to determine whether other ground lines are carrying excessive, faulty and/or leaking currents. If these types of unsafe conditions are detected, then a user can take appropriate action to locate and correct these problems.
    Type: Grant
    Filed: February 18, 2008
    Date of Patent: December 14, 2010
    Assignee: EchoStar Technologies L.L.C.
    Inventors: Kirk Lenzie, Casey Gold, Vincent Nguyen, Sam Chaisitti
  • Patent number: 7835120
    Abstract: 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 apparatus, a voltage coil also for tripping the circuit breaker apparatus located proximate to the overcurrent coil, and ground fault electronics connected to the voltage coil and structured to detect a ground fault in the circuit when the ground fault exceeds a threshold level. The ground fault electronics can be structured to send a trip signal to the voltage coil when a ground fault is detected, and the voltage coil can be structured to trip the circuit breaker apparatus when it receives the trip signal from the ground fault electronics.
    Type: Grant
    Filed: March 13, 2008
    Date of Patent: November 16, 2010
    Assignee: Carling Technologies, Inc.
    Inventor: Michael A. Fasano
  • Publication number: 20100195255
    Abstract: An electrical circuit comprising a power supply, a load, a pair of parallel positive cables between the power supply and the load, a pair of parallel negative cables between the load and the power supply, and incendive arc prevention means, comprising: monitoring means adapted to detect if the current and/or voltage in one of the pair of cables deviates from the other, and a control means adapted to fully or partially isolate the power supply from the pair of cables if the monitoring means detects that their current and/or voltage has deviated from the other, characterised in which: the electrical circuit comprises a common positive section between the power supply and the pair of positive cables, and a common negative section between the pair of negative cables and the power supply, in which a first modulation means is adapted to generate a modulated communications signal.
    Type: Application
    Filed: May 23, 2008
    Publication date: August 5, 2010
    Applicant: PEPPERL & FUCHS (DE)
    Inventors: Renato Kitchener, Gunther Rogoll, Michael Kessler
  • Patent number: 7764473
    Abstract: 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 the sensed alternating current is positive or negative, a rectifier rectifying the sensed alternating current to provide a rectified current value, and an analog-to-digital converter converting the rectified current value to a signed digital value having a positive sign. A processor cooperates with the comparators and the analog-to-digital converters and includes a routine that changes the positive sign of the signed digital value to a negative sign if the sensed alternating current is negative, adds the signed digital value for each power conductor to provide a sum, and employs the sum to determine whether to output a ground fault signal. The processor further cooperates with an operating mechanism to trip open separable contacts responsive to the ground fault signal.
    Type: Grant
    Filed: May 9, 2007
    Date of Patent: July 27, 2010
    Assignee: Eaton Corporation
    Inventors: Todd M. Shaak, Harry J. Carlino
  • Patent number: 7684162
    Abstract: A leakage current protection device with a single laminated magnetic core transformer that is formed by punch pressing an amorphous metal material, or a nanocrystalline soft metal material, in a high punch velocity press to form the ring laminations for the magnetic core. In a ground fault circuit interrupter, the single laminated magnetic core transformer serves as the input sensor for both the current imbalance detection circuitry and the low impedance ground fault protection circuitry.
    Type: Grant
    Filed: March 20, 2008
    Date of Patent: March 23, 2010
    Assignee: Magnetic Metals Corporation
    Inventors: Rodica Musat, Frank A. Raneiro, Thomas H. Rooney, Jr.
  • Patent number: 7636224
    Abstract: 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 differential switch (20) normally open and a differential current transformer (39) which generates a signal proportional to the leakage current, an elaboration unit (50) interfaced with the latter acquires said signal and keeps the switch (20) closed until a dangerous condition is met, corresponding to an acquired signal having a magnitude greater than a limit value.
    Type: Grant
    Filed: April 19, 2004
    Date of Patent: December 22, 2009
    Assignee: Trinity S.A.
    Inventor: Sandro Zandonella Balco
  • Patent number: 7633728
    Abstract: 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 determining and storing peak values of the sensed current for plural half-cycles. The processor provides arc fault detection, determines whether a first predetermined plurality of half-cycles occur in succession and correspond to non-unity power factor, and responsively inhibits the detection for a first predetermined time, and whether a second predetermined plurality of half-cycles occur in succession, each with smaller peak amplitude than that of an immediately preceding half-cycle of like or differing polarity, and responsively inhibits the detection for a second predetermined time.
    Type: Grant
    Filed: February 27, 2007
    Date of Patent: December 15, 2009
    Assignee: Eaton Corporation
    Inventors: Kevin L. Parker, Robert T. Elms
  • Patent number: 7633727
    Abstract: 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 filters to detect corresponding peak current values, envelope detectors cooperating with the filters to detect corresponding occurrences from the bands being within corresponding predetermined magnitude ranges, a counter counting the occurrences, and a processor providing and disabling series arc detection when sensed current is greater than a first predetermined value. The processor determines tallies responsive to peak current values exceeding corresponding thresholds, determines series arcing from sensed current being less than the first predetermined value for a predetermined time, the tally for a current half-cycle being nonzero, and a count for the current half-cycle being different than the count for an immediately previous half-cycle of like polarity by at least a second predetermined value.
    Type: Grant
    Filed: February 27, 2007
    Date of Patent: December 15, 2009
    Assignee: Eaton Corporation
    Inventors: Xin Zhou, John J. Shea, Kevin L. Parker, Theodore J. Miller
  • Patent number: 7619860
    Abstract: The present invention is directed to a protective device that includes a hot line terminal, a neutral line terminal, a hot load terminal, and a neutral load terminal. A low pass filter circuit has a capacitor coupled in series with a solenoid coil of the protective device. The low pass filter is coupled across the hot line terminal and the neutral line terminal. A miswire detection circuit is configured to detect a miswire fault condition when AC power is coupled to the hot load terminal and the neutral load terminal. An interrupting contact assembly includes interrupting contacts that provide electrical continuity between the hot line terminal and the hot load terminal and the neutral line terminal and the neutral load terminal in a reset state. The interrupting contacts are open in a tripped state. An indicator circuit is coupled to the interrupting contact assembly and being configured to indicate the tripped state and/or the reset state.
    Type: Grant
    Filed: September 1, 2006
    Date of Patent: November 17, 2009
    Assignee: Pass & Seymour, Inc.
    Inventors: David A. Finlay, Sr., Thomas N. Packard
  • Patent number: 7586395
    Abstract: A trip actuator assembly is provided for a circuit breaker including a housing having a mounting surface, separable contacts enclosed by the housing, and an operating mechanism structured to open and close the separable contacts. The trip actuator assembly includes a trip actuator cooperable with the operating mechanism, and a planar member having first and second ends, first and second edges, and an aperture. The trip actuator is at least partially disposed within the aperture and is further disposed between the planar member and the mounting surface of the housing. The first edge of the planar member is removably coupled to the mounting surface, thereby removably coupling the trip actuator to the housing. The circuit breaker may include an accessory tray which is insertable on and is removable from the mounting surface. When inserted, the accessory tray abuts the body of the trip actuator enclosure further securing the trip actuator.
    Type: Grant
    Filed: April 5, 2007
    Date of Patent: September 8, 2009
    Assignee: Eaton Corporation
    Inventors: Nathan J. Weister, Lance Gula
  • Patent number: 7586719
    Abstract: A GFCI having a fault indicator device or signaling device that provides a continuous audible/visual indication of a failure condition of the GFCI is disclosed herein. A failure condition may occur when continuous current flows through the terminals of a trip coil caused by a failed or damaged component such as a TRIAC or SCR of a GFCI. The failure indicator is coupled across the trip coil in the trip mechanism thereby allowing the indicator to detect the current flow. By placing such a visual and/or audible signaling device across the trip coil terminals, the shorted TRIAC or SCR provides continuous power to the coil terminals and the signaling device, even after the coil has burned out, thereby reminding a user to replace the GFCI receptacle. The signaling device can be implemented as an LED, neon lamp, buzzer or other device.
    Type: Grant
    Filed: January 30, 2006
    Date of Patent: September 8, 2009
    Assignee: Leviton Manufacturing Co., Inc.
    Inventor: Richard Bernstein
  • Patent number: 7558033
    Abstract: 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 to sense current flowing through the separable contacts and output a sensed current value; and a processor. The processor includes a first routine structured to provide parallel arc fault detection, a second routine structured to provide series arc fault detection, and a third routine structured to enable the first routine and disable the second routine for a predetermined time when the sensed current value is greater than a predetermined value and to enable the second routine and disable the first routine for the predetermined time when the sensed current value is less than the predetermined value.
    Type: Grant
    Filed: February 27, 2007
    Date of Patent: July 7, 2009
    Assignee: Eaton Corporation
    Inventors: Xin Zhou, John J. Shea, Joseph C. Engel, Kevin L. Parker, Theodore J. Miller
  • Patent number: 7538647
    Abstract: A ground fault circuit interrupter device is described.
    Type: Grant
    Filed: July 28, 2006
    Date of Patent: May 26, 2009
    Assignee: Cooper Technologies Company
    Inventor: Howard S. Leopold
  • Patent number: 7525777
    Abstract: A fireguard circuit for a power cable, which comprises a power line, a neutral line and a metal sheath surrounding the power line and the neutral line, includes a switch located in one of the lines. A solenoid sets the switch in either an open position or a closed position. A first silicon controlled rectifier (SCR) causes the solenoid to open the switch upon detecting the presence of an arcing condition between the power line and the metal sheath. A second silicon controlled rectifier (SCR) causes the solenoid to open the switch upon detecting the presence of an arcing condition between the neutral line and the metal sheath. The second SCR is connected in parallel with the first SCR, the anode of the first SCR being connected to the cathode of the second SCR and the cathode of the first SCR being connected to the anode of the second SCR.
    Type: Grant
    Filed: July 7, 2004
    Date of Patent: April 28, 2009
    Assignee: Tower Manufacturing Corporation
    Inventor: Victor V. Aromin
  • Patent number: 7440246
    Abstract: 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 locations.
    Type: Grant
    Filed: September 26, 2005
    Date of Patent: October 21, 2008
    Assignee: Leviton Manufacturing Co., Inc.
    Inventors: Gaetano Bonasia, James Richter, Steve Campolo
  • Patent number: 7403086
    Abstract: A new type of switching mechanism for a ground fault circuit interrupter (GFCI) with reverse wiring protection preferably includes two pairs of fixed contact holders, each member of each pair having at least one fixed contact at one end; a pair of movable contact holders, each having an end having one or more of movable contacts, each movable contact being arranged for contacting one of the fixed contacts; and a movable assembly that moves between first and second positions, wherein the first position is a position in which each of the contacts of the fixed contact holders makes contact with one of the contacts of the movable end of one of the movable contact holders, and wherein the second position is a position in which the contacts of the fixed contact holders are separated from the contacts of the movable contact holders.
    Type: Grant
    Filed: July 19, 2005
    Date of Patent: July 22, 2008
    Assignee: General Protecht Group U.S., Inc.
    Inventors: Zhixin Wu, Yinxian Wang, Kuidong Zhang
  • Publication number: 20080144239
    Abstract: 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 selection means to select tripping curves, actuating means, and test means connected to the measuring means. In the protection device the test means are associated with the operating rating selection means and with the time delay selection means to select a minimum or reduced operating rating and to select a minimum or reduced time delay when said test means are actuated.
    Type: Application
    Filed: November 27, 2007
    Publication date: June 19, 2008
    Applicant: Schneider Electric Industries SAS
    Inventor: Mustapha Chelloug
  • Patent number: 7375940
    Abstract: A transformer interface prevents a false ground fault interrupt in a power supply arrangement. The power supply arrangement has a line wire and a neutral wire connected by way of a ground fault interrupt circuit to an electrically powered device, to which a ground wire is also coupled. The interface has current imbalance sensor transformer windings coupled to the line and neutral wires. A ground wire current sensor transformer winding is coupled to the ground wire. A detector transformer winding produces a signal that triggers operation of the ground fault interrupt circuit, in response to the difference between currents produced by the current imbalance sensor transformer windings exceeding detected ground wire current by a prescribed value.
    Type: Grant
    Filed: March 28, 2005
    Date of Patent: May 20, 2008
    Assignee: Adtran, Inc.
    Inventor: Jeffrey John Bertrand
  • Publication number: 20080062593
    Abstract: A leakage current detection and protection circuit in a power plug includes an SCR (silicon-controller rectifier), diodes, capacitor, resistors, and a solenoid with a plunger. The control gate of the SCR is connected via a resistor to a metal sheath L of the cord. The solenoid SOL, the SCR and a diode are connected in series and connected across the hot and neutral lines of the power line (either line or load side), forming an SCR conducting path. When wire for the hot, neutral or ground lines in the cord is exposed due to damage or aging, the sheath around the wires becomes live, forming a conducting circuit from the sheath, resistors and diodes to the hot or neutral lines. The voltage on the resistor causes the SCR to conduct, which energizes the solenoid to open a switch between the line side and load sides of the plug.
    Type: Application
    Filed: June 5, 2007
    Publication date: March 13, 2008
    Applicant: SHANGHAI ELE MANUFACTURING CORP.
    Inventors: Cheng-Li Li, Guo-Lan Yue, Long Zhang
  • Patent number: 7336457
    Abstract: Disclosed is an end-of-life status alarm indication circuit and method for indicating the failure of the primary contacts of a ground fault circuit interruption (GFCI) device to open when a ground fault circuit is detected by the GFCI device. The GFCI device will protect against the situation where the primary contacts of a GFCI device become welded together and will not open when a ground fault circuit is detected by the device. The alarm indication may be either an audible or visual indication.
    Type: Grant
    Filed: August 8, 2005
    Date of Patent: February 26, 2008
    Assignee: Hubbell Incorporated
    Inventor: Stephen M. Liscinsky, III
  • Patent number: 7233464
    Abstract: A ground fault detection system is provided where one current sensor is used to calibrate a second sensor in order to provide automatic zeroing of the difference measurement. The calibration is done gradually in order to differentiate between sensor drift and a transition in current due to a differential fault.
    Type: Grant
    Filed: January 9, 2004
    Date of Patent: June 19, 2007
    Assignee: Goodrich Corporation
    Inventor: Kevin Edward Rice
  • Patent number: 7161780
    Abstract: A typical duplex GFCI receptacles has two buttons, a test button that, when pressed, shuts off power to the receptacle and down stream devices, and a reset button that, when pressed, restores power to the GFCI and down stream devices. Generally, the test button is pressed to verify that the GFCI will interrupt power to the conductive paths and the reset button is pressed to reset the GFCI. In operation, the test portion of the GFCI will automatically break electrical continuity in one or more conductive paths (i.e., open the conductive path) between line and load sides upon the detection of a fault such as a reverse wiring condition, a ground fault, an open neutral and/or a defective GFCI device. When this happens the reset button in the typical GFCI receptacle is then pressed in an to attempt to restore power. The GFCI here disclosed has only one button which is used for both the test and reset operation.
    Type: Grant
    Filed: January 20, 2004
    Date of Patent: January 9, 2007
    Assignee: Leviton Manufacturing Co., Inc.
    Inventors: Frantz Germain, Stephen Stewart