With Differential Sensing In A Polyphase System Patents (Class 361/44)
  • Patent number: 10910812
    Abstract: A high accuracy open phase detection system for power transformers that uses a combination of logic controllers and current transformers to recognize an open phase condition experienced by the power transformers under no load, light load, and full load conditions. A current to voltage and current to current transformer on each phase are employed to detect the excitation current and load current conditions. During an open phase condition, a microprocessor detecting device, connected to the current to voltage and current to current transformers, monitors the appropriate power system quantities to determine the existence of one or more open phase(s) with or without a ground or an open phase with line charging capacitance. Through the microprocessor monitor, the microprocessor detecting device can alert operators to the loss of phase or abnormal conditions in the power source.
    Type: Grant
    Filed: October 23, 2018
    Date of Patent: February 2, 2021
    Assignee: Power Control Systems, Inc.
    Inventors: Michael L. McAnelly, Jeremy S. Davey, Donald J. Norris, Robert P. Bayly
  • Patent number: 10756531
    Abstract: Embodiments of the invention include systems and techniques for implementing voltage differential transducer (VDT) fault detection. Embodiments include a computing resource electrically coupled to an AC power supply, a VDT including a primary winding and a set of secondary windings, wherein the VDT is electrically coupled to the AC power supply. Embodiments also include a current sensing circuit electrically coupled to the AC power supply and the VDT, and a signal processor electrically coupled to an output of the VDT and the computing resource, the signal processor providing a signal indicative of a voltage differential of the set of secondary windings of the VDT, that is used by the computing resource to make an error determination.
    Type: Grant
    Filed: March 29, 2018
    Date of Patent: August 25, 2020
    Assignee: HAMILTON SUNSTRAND CORPORATION
    Inventor: Gary M. McBrien
  • Patent number: 10132875
    Abstract: A high accuracy open phase detection system for power transformers that uses a combination of logic controllers and current transformers to recognize an open phase condition experienced by the power transformers under no load, light load, and full load conditions. A current to voltage and current to current transformer on each phase are employed to detect the excitation current and load current conditions. During an open phase condition, a microprocessor detecting device, connected to the current to voltage and current to current transformers, monitors the appropriate power system quantities to determine the existence of one or more open phase(s) with or without a ground or an open phase with line charging capacitance. Through the microprocessor monitor, the microprocessor detecting device can alert operators to the loss of phase or abnormal conditions in the power source.
    Type: Grant
    Filed: April 25, 2014
    Date of Patent: November 20, 2018
    Assignee: Power Control Systems, Inc.
    Inventors: Michael L. McAnelly, Jeremy S. Davey, Randall P. Robert, Donald J. Norris, Robert P. Bayly
  • Patent number: 9983249
    Abstract: A method for detecting a ground fault in an inverter using leg-shunt resistors is provided. The method includes detecting output currents of three phases of the inverter, determining whether or not a voltage utilization of the inverter is not less than a preset allowable voltage level, and determining an occurrence or non-occurrence of the ground fault in the inverter.
    Type: Grant
    Filed: March 7, 2016
    Date of Patent: May 29, 2018
    Assignee: LSIS CO., LTD.
    Inventors: Jaemoon Lee, Chunsuk Yang
  • Patent number: 9983250
    Abstract: A line break detection system for detecting a break in a conductor (1.004), the system including a first return signal generator (1.020) proximate a first end of a segment of the conductor, the first return signal generator being adapted to apply a first return signal to the conductor, the system including a first return signal detector (1.016) proximate a second end of the segment of the line, the second end being upstream of the first end, the first detector being adapted to receive the first return signal from the line, wherein the first return signal generator ceases to generate the first return signal if the line is broken.
    Type: Grant
    Filed: April 1, 2014
    Date of Patent: May 29, 2018
    Assignee: NEXANS
    Inventors: Kenneth Willis Barber, Michael Lee, Gilles Fouche
  • Patent number: 9979341
    Abstract: Methods and systems for programming an electric motor are provided. An electric motor controller configured to be coupled to an electric motor is configured to control the electric motor to produce torque when direct current (DC) link voltage has up to 100% voltage ripple. The controller includes a first power input, a second power input, and a third power input, an energized line detection device, and a microprocessor. Each power input is configured to receive power from an alternating current (AC) power source. The energized line detection device is configured to sense which power input has received power from the AC power source and output an isolated signal. The microprocessor is coupled downstream from the energized line detection device and is configured to determine an operating profile for the electric motor based on the isolated signal.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: May 22, 2018
    Assignee: Regal Beloit America, Inc.
    Inventors: Roger Carlos Becerra, Ludovic Andre Chretien, Glen Chester Young
  • Patent number: 9954352
    Abstract: A power system includes main circuit interrupters each having a load output, feeder circuit interrupters, a number of tie circuit interrupters, and a circuit. The circuit is structured to block communication, at least when at least one of the tie circuit interrupters has an open state between a first and a second of the main circuit interrupters, of a zone selective interlocking output of one of the feeder circuit interrupters having a line input electrically connected to the load output of the first main circuit interrupter to a zone selective interlocking input of the second main circuit interrupter, and of a zone selective interlocking output of a different one of the feeder circuit interrupters having a line input electrically connected to the load output of the second main circuit interrupter to a zone selective interlocking input of the first main circuit interrupter.
    Type: Grant
    Filed: June 27, 2016
    Date of Patent: April 24, 2018
    Assignee: EATON INTELLIGENT POWER LIMITED
    Inventor: Robert Eugene Hulse
  • Patent number: 9952271
    Abstract: The detection of an insulation fault on a network furnished with tappings by a first monitor can be followed by the location and identification of the fault by way of a locator to be placed on the tappings. To satisfy the level-two security, or SIL-2, in which the risk of occurrence of a hazard is decreased by a factor of greater than 100, second means for detecting the insulation fault are installed, to obtain a redundant item of information as regards the insulation resistance of the network, independently of the monitor but associated with a locator.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: April 24, 2018
    Assignee: SCHNEIDER ELECTRIC INDUSTRIES SAS
    Inventors: Bernard Dalban Pilon, Franck Gruffaz
  • Patent number: 9928955
    Abstract: An abnormality occurring in a ZCT is detected simply and reliably. A zero-phase-sequence current transformer (ZCT) (11) detects zero-phase-sequence current in power wires inserted therethrough, and in addition to the power wires, has inserted therethrough a wire through which a constant DC offset current flows.
    Type: Grant
    Filed: August 29, 2013
    Date of Patent: March 27, 2018
    Assignee: KYOCERA CORPORATION
    Inventor: Tetsuya Takenaka
  • Patent number: 9897636
    Abstract: A single wound single current transformer impedance measurement circuit for determining a circuit element parameter in a ground fault circuit interrupter circuit. The circuit includes a transconductance amplifier having first and second input terminals and first and second output terminals. In an embodiment, a first detector has input terminal coupled to the first output terminal of the transconductance amplifier and another input terminal coupled for receiving a first electrical signal. A second detector has a terminal coupled to the second output terminal of the transconductance amplifier and an input terminal coupled for receiving the first electrical signal. Alternatively, the second detector has an input terminal coupled to the first output terminal of the transconductance amplifier and another input terminal coupled for receiving the first electrical signal.
    Type: Grant
    Filed: April 26, 2016
    Date of Patent: February 20, 2018
    Assignee: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC
    Inventors: Riley D. Beck, Kent D. Layton, Matthew A. Tyler, Scott R. Grange
  • Patent number: 9577422
    Abstract: A grounding wire fault circuit interrupter for an electrical machine includes a chassis ground wire, a sensor, and a logic circuit. The chassis ground wire is configured to be electronically connected to a structure of the electrical machine such that the structure of the electrical machine is further electrically connected to one or more power lines that provide electrical power to the electrical machine. The sensor is electronically connected to the chassis ground wire. The logic circuit is electronically connected to the sensor. The sensor is configured to detect current leaks within the electrical machine by sensing electrical power on the chassis ground wire, and the logic circuit is configured to interrupt the flow of electrical power to the electrical machine when the sensor detects a current leak.
    Type: Grant
    Filed: December 11, 2015
    Date of Patent: February 21, 2017
    Inventor: Dennis E. Lewis
  • Patent number: 9519016
    Abstract: A ground fault detection apparatus is an apparatus detecting a ground fault in an ungrounded AC circuit in which a single-phase three-wire AC power source is connected to a load via a U phase wire, a neutral wire, and a V phase wire, including two resistive elements having an identical resistance value, one terminals of the two resistive elements being connected to the U phase wire and the neutral wire, respectively, the other terminals thereof being connected to each other. The ground fault detection apparatus further includes a current detector detecting a value of a current flowing between the other terminals of the two resistive elements (i.e., a node N1) and a ground point. In a case where the absolute value of the current exceeds a threshold value, the ground fault detection apparatus determines that a ground fault occurs.
    Type: Grant
    Filed: June 9, 2014
    Date of Patent: December 13, 2016
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Katsuhiko Satoh, Ryohji Matsui, Hiroshi Kawamura
  • Patent number: 9497850
    Abstract: In at least one embodiment, a lighting system includes one, some, or all of a switch path, link path, and flyback path power dissipation circuits to actively and selectively control power dissipation of excess energy in a switching power converter of the lighting system. The flyback path power dissipation circuit dissipates power through a flyback path of the switching power converter. In at least one embodiment, the lighting system controls power dissipation through the flyback path by controlling a transformer primary current in the flyback path and, for example, limiting the primary current with a current source and dissipating power in the flyback switch and the current source.
    Type: Grant
    Filed: November 4, 2011
    Date of Patent: November 15, 2016
    Assignee: KONINKLIJKE PHILIPS N.V.
    Inventors: John L. Melanson, Eric J. King
  • Patent number: 9362736
    Abstract: A solid state switch module is provided for use in a power distribution network including an input differential protection connection for receiving a measured current value from an upstream module. The solid state switch module also includes an output differential protection connection for sending a measured current value. The solid state switch module includes a trip outlet for sending a trip signal to an upstream solid state switch, and a trip inlet for receiving a trip signal from a downstream solid state switch. The trip inlet is operably coupled to the switch. A current sensor measures the current value of a connected power transmission line across the solid state switch module. A summer adds a current input from a parallel module with the current measures by the current sensor. A comparator determines whether an amount of current lost between the solid state switch module and an upstream module is acceptable.
    Type: Grant
    Filed: April 26, 2012
    Date of Patent: June 7, 2016
    Assignee: HAMILTON SUNDSTRAND CORPORATION
    Inventors: Michael Krenz, Carl A. Wagner, Jeffrey T. Wavering, Norbert J. Simper, Josef Maier, Rainer J. Seidel, Michael William Foster
  • Patent number: 9330875
    Abstract: A method for determining a circuit element parameter in a ground fault circuit interrupter circuit. An electrical signal provided to a first node is used to generate another electrical signal at a second node. The electrical signal at the second node is multiplexed with a modulation signal to generate a modulated signal that is then filtered and converted into a digital representation of a portion of the circuit element parameter. The electrical signal at the second node is multiplexed with the modulation signal after it has been phase shifted to produce a modulated signal that is filter and converted into a digital representation of another portion of the circuit element parameter. In another aspect, a slope based solenoid self-test method is used for self-testing in a GFCI circuit. Alternatively, a method for determining a wiring fault is provided using a digital filter.
    Type: Grant
    Filed: January 29, 2013
    Date of Patent: May 3, 2016
    Assignee: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC
    Inventors: Riley D. Beck, Kent D. Layton, Matthew A. Tyler, Scott R. Grange
  • Patent number: 9305731
    Abstract: A supply system for supplying energy in an aircraft includes at least one electrical line including at least one core connectable to a pole of a current source, an electrically conductive shield, and a detection unit having at least two electrical inputs. The shield surrounds the at least one core under a distance and creates an intermediate space between the at least one core and the shield. At least one port of the detection unit is connected to the at least one core. At least another port of the detection unit is connected to at least one of the shield and the at least one core. The detection unit is adapted for detecting a differential current over the at least one core or an absolute current between the shield and a ground potential for generating a warning signal if a predetermined threshold value for the detected current value is exceeded.
    Type: Grant
    Filed: October 11, 2013
    Date of Patent: April 5, 2016
    Assignee: Airbus Operations GmbH
    Inventors: Jens Schult, Torsten Stengel, Nicolas Fouquet
  • Patent number: 9297862
    Abstract: A fault in a DC power source, such as a battery string or a string of photovoltaic cells, is identified by detecting a change in an AC component of a residual current of the DC power source. In some embodiments, the DC power source is coupled to at least one DC bus and the methods further include generating an AC voltage on the at least one DC bus. For example, the DC power source may be coupled to a modulated DC bus of an uninterruptible power supply (UPS) system comprising an inverter having an input coupled to the DC bus. The inverter may be configured to generate an AC output voltage and the AC component has a frequency that is a harmonic of a fundamental frequency of the AC output voltage, such as a third harmonic of the fundamental frequency of the AC output voltage.
    Type: Grant
    Filed: July 28, 2011
    Date of Patent: March 29, 2016
    Assignee: Eaton Corporation
    Inventors: George W. Oughton, Jr., Yu Liu, Debrup Das, Pasi S. Taimela, Bobby L. Compton
  • Patent number: 9184580
    Abstract: An arrester includes a switch and a lightning detection breaker connected to the switch. The lightning detection breaker includes a metal conducting terminal electrically connected to an earth return, a DC power supply terminal, a ground terminal and an output terminal. When the power supply is under a lightning strike, a potential difference of both the DC power supply terminal and the ground terminal of the lightning detection breaker will go up to several thousands of volts. However, a voltage of the metal conducting terminal will not go up because the metal conducting terminal is electrically connected to the earth return. The switch will automatically become open circuit by the lightning detection breaker, and therefore an electronic device connected to the arrester is protected from damage done by the lightning.
    Type: Grant
    Filed: January 24, 2013
    Date of Patent: November 10, 2015
    Assignee: Luxul Technology Incorporation
    Inventors: Cheng-Hung Pan, Perng-Fei Yuh
  • Patent number: 9178350
    Abstract: A system for distributing electrical current to a plurality of loads includes a first sensor coupled to an input of a protection zone for measuring a first current entering the protection zone, wherein the protection zone includes at least a portion of an electrical distribution feeder. The system also includes a second sensor coupled to an output of the protection zone for measuring a second current exiting the protection zone, and a processor coupled to the first sensor and to the second sensor. The processor is programmed to receive measurements representative of the first current and the second current, and calculate a reactive current differential of the protection zone based on the first current and the second current. The processor is also programmed to compare the reactive current differential with a fault threshold, and generate an error notification if the reactive current differential is greater than the fault threshold.
    Type: Grant
    Filed: November 30, 2011
    Date of Patent: November 3, 2015
    Assignee: General Electric Company
    Inventors: Pan Yan, Reigh Allen Walling, Amol Rajaram Kolwalkar, Michael Lewis Reichard, Wei Ren, Swakshar Ray
  • Patent number: 9056551
    Abstract: A braking system can include a monitor circuit and/or a contactor control circuit. The braking system utilizes a number of contactors coupled between a power bus. The contactors selectively provide power to resistive elements. The monitor circuit is configured to determine the number of closed contactors of the contactors using current transformers. The contactor control circuit is configured to open and close the contactors. The control circuit includes a solid state timer circuit for each coil associated with the contactors. The solid state timer circuit bypasses a resistive element in series with the coil for a period of time.
    Type: Grant
    Filed: September 10, 2012
    Date of Patent: June 16, 2015
    Assignee: Caterpillar Global Mining LLC
    Inventor: Saeid Mirzaei
  • Patent number: 9013841
    Abstract: An earth leakage circuit breaker includes an earth leakage detector, a rectifier, a switching part, and a controller. The switching part is installed on an electric circuit between an alternating current (AC) power supply and the rectifier, and switches between supply and interruption of the power from the AC power supply. The earth leakage detector is installed between the AC power supply and a load. The rectifier rectifies the AC power into direct current (DC) power. The controller causes the rectifier to perform half-wave rectification until earth leakage is detected by the earth leakage detector, and causes the rectifier to perform full-wave rectification when the earth leakage is detected by the earth leakage detector.
    Type: Grant
    Filed: November 25, 2013
    Date of Patent: April 21, 2015
    Assignee: KYOCERA Document Solutions Inc.
    Inventor: Naoki Sueishi
  • Patent number: 8963558
    Abstract: A current differential protection system for a multi-terminal power line includes a current sensor for sensing a current at a local terminal, a controller for time synchronizing the local terminal and remote terminals, and a fault detection module to detect a fault in the multi-terminal power line if a differential current exceeds a threshold value. The controller includes a time measurement exchange module for exchanging time stamp data with remote terminals, an upper range clock for exchanging time stamp data with remote terminals and a lower range clock for indexing the current at the local terminal. A first time period of the upper range clock is N times a second time period of the lower range clock where N is a number of multi-terminals. The controller includes a clock offset calculation module for determining an average time offset based on time stamp data from remote terminals and the local terminal.
    Type: Grant
    Filed: October 31, 2012
    Date of Patent: February 24, 2015
    Assignee: General Electric Company
    Inventors: Yan Pan, William James Premerlani
  • Patent number: 8902552
    Abstract: The present invention is directed to a circuit interrupting device including an actuator that provides an actuator stimulus upon the occurrence of the fault actuation signal. A circuit interrupter is positioned to electrically disconnect the first, second and third electrical conductors from each other upon the occurrence of the actuator stimulus. An automated test circuit is coupled to the circuit interrupting assembly. The automated test circuit is configured to automatically produce the simulated fault condition during a predetermined portion of an AC line cycle to determine whether the fault detection assembly is operational such that the fault detection assembly provides a fault detection signal without the circuit interrupter electrically disconnecting the first, second and third electrical conductors from each other.
    Type: Grant
    Filed: July 1, 2013
    Date of Patent: December 2, 2014
    Assignee: Pass & Seymour, Inc.
    Inventors: Dejan Radosavljevic, Jeffrey C. Richards, Kent R. Morgan, David A. Finlay, Sr.
  • Patent number: 8861146
    Abstract: The present invention is directed to an electrical wiring device for use in an electrical distribution system. The device includes a plurality of line terminals configured to terminate the plurality of line conductors and a plurality of load terminals configured to terminate the plurality of load conductors. The protective circuit assembly includes at least one fault detector configured to generate a fault detection signal based on electrical perturbations propagating on at least one of the plurality of line terminals or at least one of the plurality of load terminals. A device integrity evaluation circuit includes a timing circuit coupled to the source of AC power by way of the plurality of load terminals and configured to generate a time measurement. The device integrity evaluation circuit is configured to reset the time measurement if the protective circuit assembly generates the fault detection signal during a predetermined test interval in the properly wired condition.
    Type: Grant
    Filed: December 17, 2010
    Date of Patent: October 14, 2014
    Assignee: Pass & Seymour, Inc.
    Inventors: Michael McMahon, Kent R. Morgan
  • Patent number: 8797696
    Abstract: A current leakage protection circuit includes a first input terminal, a second input terminal for receiving a power voltage and a current leakage detection terminal configured for detecting a current leakage from an electronic device. A control circuit of the current leakage protection circuit is configured for providing a control signal to control a first switch circuit to switch off a first connection between the first input terminal and a first output terminal and to control a second switch circuit to switch off a second connection between the second input terminal and a second output terminal when the current leakage detection terminal detects current leakage of the electronic device.
    Type: Grant
    Filed: July 5, 2012
    Date of Patent: August 5, 2014
    Assignees: Fu Tai Hua Industry (Shenzhen) Co., Ltd., Hon Hai Precision Industry Co., Ltd.
    Inventors: Ren-Wen Huang, Yin-Zhan Wang, Jun-Wei Zhang, Chia-Hung Chien, Tsung-Jen Chuang, Shih-Fang Wong
  • Patent number: 8760849
    Abstract: An electrical protection circuit comprises a circuit board, an induction coil, a self-exciting coil, a control chip, a silicon controlled rectifier, a rectifier diode, a resistor, a filtration capacitor, a trip coil with iron core, a group of main circuit switches, and a reset button. An analog electric single-pole double-throw switch linked with the reset button comprises a traveling contact lever, a first static contact jaw, and a second static contact jaw. When the reset button is in a tripped or reset state, the traveling contact lever is connected with the second static contact jaw and the switch is in a closed state. When the reset button is pressed down, the traveling contact lever disconnects from the second static contact jaw, contacts the first static contact jaw, then disconnects from the first static contact jaw and returns to the closed state with the second static contact jaw.
    Type: Grant
    Filed: June 14, 2012
    Date of Patent: June 24, 2014
    Inventor: Huadao Huang
  • 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: 8717721
    Abstract: A high impedance fault isolation system for a radially connected three phase electric power line that utilizes three phase current measurements to determine the presence of a fault without the need for any voltage measurements or a battery powered controller. This eliminates the need for costly phase voltage measuring devices conventionally required to detect high impedance faults, which makes it economical to install fault isolation system at a greater number of locations throughout the power system. The system detects faults using current measurements by computing the negative and zero sequence current components and comparing the amplitudes of the negative and zero sequence components. A fault is detected when the ratio of the amplitudes of the negative and zero sequence components falls within a predefined fault detection range, such as the range from 0.5 to 1.5.
    Type: Grant
    Filed: August 25, 2011
    Date of Patent: May 6, 2014
    Assignee: Southern States, LLC
    Inventor: Joseph R. Rostron
  • 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: 8710850
    Abstract: A system and method is provided for determining the existence of a ground fault connection within a vehicle. An electrical connector may be provided for electrically connecting the vehicle to an external Alternating Current (AC) power source. The electrical connector includes a three phase electrical connector configured to receive a corresponding input voltage signal on a phase, neutral, and earth connection. A controller being configured to determine whether a faulty earth connection exists between the vehicle and the AC power source the phase connection does not exceed the predetermined phase threshold when referenced to the earth connection and the neutral connection does not exceed the predetermined neutral threshold when referenced to the earth connection or the phase connection exceeds the predetermined phase threshold when referenced to the earth connection and the neutral connection exceeds the predetermined neutral threshold when referenced to the earth connection.
    Type: Grant
    Filed: November 22, 2011
    Date of Patent: April 29, 2014
    Assignee: Renault S.A.S.
    Inventors: Jose Gabriel Fernandez Banares, Albert Trenchs Magana
  • Patent number: 8614867
    Abstract: A power supply is disclosed for an electronic tripping unit and, in particular a circuit breaker for low voltages, which is connected on the outgoer side to a load via whose load resistance a direct current or alternating current flows. An electronic tripping unit initiates the disconnection of the associated contact elements in the event of an overcurrent and/or short-circuit current, and a voltage tap taps off a voltage on the conductor in order to supply power to the tripping unit. In order to ensure that power is always supplied to the tripping unit, the power supply includes, in at least one embodiment, an inductance between the load and the voltage tap, which inductance is connected in the conductor and is of such a magnitude that, when the current changes over time during the course of a short circuit, the voltage which is tapped off as the voltage drop across the inductance ensures the supply of electrical power to the tripping unit at least for a minimum time.
    Type: Grant
    Filed: August 25, 2011
    Date of Patent: December 24, 2013
    Assignee: Siemens Aktiengesellschaft
    Inventors: Josef Götz, Thomas Kiendl
  • Patent number: 8614869
    Abstract: An apparatus, method, and system for providing ground fault circuit interrupter (GFCI)-type functionality for electrical systems that may experience leakage current, such as those used in outdoor sports lighting applications, and may benefit from mitigation of electrical shock hazards. The resulting system is such that an equipment-grounded electrical system, where the grounding system is actively monitored, in conjunction with the envisioned GFCI functionality, may comprise an electrical protection system whereby personal injury is minimized.
    Type: Grant
    Filed: October 9, 2012
    Date of Patent: December 24, 2013
    Assignee: Musco Corporation
    Inventors: Darrell N. Chelcun, John P. Pischl
  • Patent number: 8605395
    Abstract: The adapter is a circuit that allows the combination of two plugs on a standard duplex receptacle to be connected to a single electrical load. Each plug's hot and neutral outputs are controlled by a single throw electrical switch that is actuated by it's control input being transversely wired in parallel to the other plug. This arrangement doubles the connection's surface contact area since four prongs are used instead of two, thereby lowering the electrical resistance and increasing the current capacity. It has circuit protective devices wired in series between the hot output of each plug and the input of it's corresponding electrical switch. The circuit will not power up if a short, open or miss wired condition is encountered.
    Type: Grant
    Filed: January 26, 2011
    Date of Patent: December 10, 2013
    Inventor: Charles James Hoyenski, III
  • 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: 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: 8537021
    Abstract: Apparatus, methods, and systems for providing comprehensive control and monitoring of an electrical system are presented. The envisioned invention according to at least one aspect provides for control and monitoring functions that include main circuit level functions and sub-circuit level functions. The control and monitoring function further provides for communication with a remote central control center to send commands to and receive data from the main circuit control and/or sub-circuit(s). Information from the monitoring function may be used to alter the operation of the system, aid in diagnostic response, and ultimately, improve the safety and reliability of the electrical system.
    Type: Grant
    Filed: September 10, 2010
    Date of Patent: September 17, 2013
    Assignee: Musco Corporation
    Inventors: Myron Gordin, Jeffrey A. Jacobson, Darrell N. Chelcun, Timothy D. McGill, Alan W. Sheldon
  • Patent number: 8531803
    Abstract: An inverter includes two input lines for connecting the inverter to an AC power source, a buffer capacitance effective between the input lines, a grounded potential equalization busbar, an isolation monitoring device monitoring the electrical isolation of one of the two input lines with regard to the potential equalization busbar, and an overvoltage eliminating device having at least one overvoltage eliminator for draining overvoltages from the input lines to the potential equalization busbar. The at least one overvoltage eliminator is connected between that input line, whose electric isolation with regard to the potential equalization busbar is monitored, and the potential equalization busbar, without any fuse being connected in series with the at least one overvoltage eliminator. Any overvoltage eliminator of the overvoltage eliminating device, which is connected between the other of the two input lines and the potential equalization busbar, if present, is connected in series with a fuse.
    Type: Grant
    Filed: February 17, 2011
    Date of Patent: September 10, 2013
    Assignee: SMA Solar Technology AG
    Inventors: Andreas Falk, Gerold Schulze
  • Publication number: 20130229735
    Abstract: A high-impedance system that utilizes asynchronous, line-mounted single-phase current and voltage sensors with rolling data logs and a common clock or other event trigger to synchronize the signals to a common time scale whenever a fault event is detected. The use of asynchronous, single-phase current and voltage angle sensors with rolling data logs, along with a common clock to synchronize the signals to common time scale whenever a fault event is detected, avoids the need for simultaneous three-phase current measurement. Integration of information, triggered by the detection of a loss or sufficient change of current on three or four (with a neutral current) devices, is used to determine the presence and direction of high-impedance faults and then report it, typically to a central control center via SCADA or another communication system, which implements fault isolation.
    Type: Application
    Filed: April 17, 2013
    Publication date: September 5, 2013
    Applicant: SSI Power, LLC
    Inventor: Joseph R. Rostron
  • Patent number: 8493697
    Abstract: The invention relates to an arrangement (10) for ground fault monitoring of an AC circuit between, on one hand, a neutral conductor (N?) of the AC circuit and, on the other hand, a protective ground wire (PE) or a ground wire with a series connection of ohmic resistors (R1, R2, R3), which has a first terminal (101) for the neutral conductor (N?) and a second terminal (102) for the protective ground wire (PE) or ground wire, wherein the arrangement includes at least one means for detecting a break of one of the resistors (R1, R2, R3) of the series connection.
    Type: Grant
    Filed: November 17, 2011
    Date of Patent: July 23, 2013
    Assignee: AEG Power Solutions B.V.
    Inventor: Peter Wallmeier
  • Patent number: 8477466
    Abstract: The present invention is directed to a protective wiring device including a fault detection circuit configured to provide a fault detection signal in response to a fault condition or a simulated fault condition. A second circuit is coupled to at least one user-accessible button and is configured to conduct a second signal in response to a user actuation of the at least one user-accessible button if the plurality of line terminals are coupled to a source of AC power, the second signal not simulating the fault condition. An automatic test circuit is configured to periodically determine whether the fault detection circuit is operative and provide an electronics test failure signal if the fault detection circuit fails to provide the fault detection signal in response to the periodically effected simulated fault condition.
    Type: Grant
    Filed: December 21, 2011
    Date of Patent: July 2, 2013
    Assignee: Pass & Seymour, Inc.
    Inventors: Dejan Radosavljevic, Jeffrey C. Richards, Kent R. Morgan, David A. Finlay, Sr.
  • Patent number: 8472154
    Abstract: A leakage current masking device for use with a circuit includes at least one inductive load device coupled to the circuit and configured to supply an inductive load to the circuit, and a processor communicatively coupled to the inductive load device. The processor is configured to receive a signal representative of a current through the circuit, calculate a capacitive leakage current component of the current, and cause the inductive load device to adjust the inductive load supplied to the circuit to reduce the capacitive leakage current component.
    Type: Grant
    Filed: December 8, 2010
    Date of Patent: June 25, 2013
    Assignee: General Electric Company
    Inventors: Cecil Rivers, Jr., Thomas Frederick Papallo, Jr.
  • Patent number: 8451568
    Abstract: The invention relates to a remotely-controllable circuit breaker, including a first circuit breaking unit, remote control unit, and housing. The first circuit breaking unit and the remote control unit are disposed in the housing; the first circuit breaking unit operates to switch on or off loads and electric lines; the remote control unit operates to control the interruption of the remotely-controllable circuit breaker via a remote control signal; and the housing is made of insulating and flame-retardant materials.
    Type: Grant
    Filed: May 6, 2010
    Date of Patent: May 28, 2013
    Assignee: Hubei Shengjia Electric Apparatus Co., Ltd.
    Inventors: Jiasheng Wan, Zhiqiang Wang
  • Patent number: 8446699
    Abstract: This invention relates to a residual current device which is able to safely and reliably operate when a line voltage is present (voltage dependent mode) and when the line voltage is not present or falls below a predetermined threshold level (voltage independent mode). The present invention is implemented as a residual current device having a trip mechanism for isolating an electric supply to an electrical installation upon detection of a predetermined current imbalance between the line and neutral conductors of said electric supply. The present invention comprises a current transformer having a secondary winding responsive to any current imbalance on said electrical installation, and a circuit protection winding being connectable to a processing means.
    Type: Grant
    Filed: April 11, 2007
    Date of Patent: May 21, 2013
    Assignee: Eaton Industries Manufacturing GmbH
    Inventor: Jonathan Keith Jackson
  • Patent number: 8437108
    Abstract: The present invention is directed to a protective wiring device for use in an electrical distribution system. The device includes a test facility includes a testing circuit configured to periodically generate at least one first test signal without execution of software instructions. A test monitoring circuit operates without execution of software instructions and is configured to effect an end-of-life detection state if the circuit interrupter fails to effect the tripped state in response to the electronics test failure state or in response to detecting a failure in the actuator assembly. An end-of-life circuit assembly is coupled to the test monitoring circuit, the end-of-life circuit assembly being configured to permanently decouple the plurality of line terminals from the plurality of load terminals in response to the end-of-life detection state.
    Type: Grant
    Filed: December 5, 2011
    Date of Patent: May 7, 2013
    Assignee: Pass & Seymour, Inc.
    Inventors: Dejan Radosavljevic, Jeffrey C. Richards, Kent R. Morgan, David A. Finlay, Sr.
  • Patent number: 8427794
    Abstract: A multi-pole circuit breaker having the same number of sensors and controllers as poles. One pole is monitored by a first sensor and a first controller, which are disposed on a first circuit board. Another pole is monitored by a second sensor and a second controller, which are disposed on a second circuit board that is cable-connected to the first circuit board. A ground-fault sensor monitors the sum of current flowing through the line conductors and a neutral conductor, and the output of the ground-fault sensor is provided to one or both of the controllers. Each controller is operable to detect arc faults on the respective line that it is monitoring, and at least one is operable to detect ground faults. A push-to-test algorithm is executed in relay fashion, with one controller executing the test before passing the result of the test onto the next controller, which in turns executes the test.
    Type: Grant
    Filed: June 19, 2009
    Date of Patent: April 23, 2013
    Assignee: Schneider Electric USA, Inc.
    Inventors: Robert F. Dvorak, Brett Larson
  • Patent number: 8412966
    Abstract: Solid state power controllers are described that include a switch controlled by a microcontroller and communication contacts. In one aspect of the invention, the microcontroller is galvanically isolated from the communication contacts using magnetoresistive isolation. In another aspect of the invention a number of solid state power controllers are connected to an external microcontroller to form a power distribution array. In addition, messages exchanged between the external microcontroller and the solid state power controllers can be used to configure the solid state power controllers and provide a user interface.
    Type: Grant
    Filed: April 25, 2012
    Date of Patent: April 2, 2013
    Assignee: Leach International Corporation
    Inventors: Farshid Tofigh, Otmar Kruppa, Imtiaz Khan, Iraj Ghahramani, David Lawton, Kent Policky
  • Publication number: 20130050882
    Abstract: A high impedance fault isolation system for a radially connected three phase electric power line that utilizes three phase current measurements to determine the presence of a fault without the need for any voltage measurements or a battery powered controller. This eliminates the need for costly phase voltage measuring devices conventionally required to detect high impedance faults, which makes it economical to install fault isolation system at a greater number of locations throughout the power system. The system detects faults using current measurements by computing the negative and zero sequence current components and comparing the amplitudes of the negative and zero sequence components. A fault is detected when the ratio of the amplitudes of the negative and zero sequence components falls within a predefined fault detection range, such as the range from 0.5 to 1.5.
    Type: Application
    Filed: August 25, 2011
    Publication date: February 28, 2013
    Inventor: Joseph R. Rostron
  • Patent number: 8335063
    Abstract: A hub for use with a circuit protection system includes a first input port configured to communicatively couple to at least one sensor device, wherein the at least one sensor device includes a light source and at least one light sensor. The hub also includes a first output port configured to communicatively couple to at least one controller, and a processor communicatively coupled to the first input port and to the first output port. The processor is configured to receive a sensor status signal from the at least one light sensor via the first input port in response to a test pulse emitted by the light source, and transmit a hub status signal to the at least one controller via the first output port based at least in part on the sensor status signal.
    Type: Grant
    Filed: August 31, 2010
    Date of Patent: December 18, 2012
    Assignee: General Electric Company
    Inventors: John Kenneth Hooker, Michael Paul Lafond, Henry Hall Mason, Jr., Megan Dalene Bardolph
  • 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: 8320089
    Abstract: An apparatus, method, and system for providing ground fault circuit interrupter (GFCI)-type functionality for electrical systems that may experience leakage current, such as those used in outdoor sports lighting applications, and may benefit from mitigation of electrical shock hazards. The resulting system is such that an equipment-grounded electrical system, where the grounding system is actively monitored, in conjunction with the envisioned GFCI functionality, may comprise an electrical protection system whereby personal injury is minimized.
    Type: Grant
    Filed: March 30, 2010
    Date of Patent: November 27, 2012
    Assignee: Musco Corporation
    Inventors: Darrell N. Chelcun, John P. Pischl