Voltamperes (real Or Reactive) Patents (Class 324/141)
  • Patent number: 10209283
    Abstract: An electrical phase (e.g., a phase from among three-phase power) connected to an electrical meter may be determined. In one example of the techniques, changes in energy or power (e.g., a derivative or differences) may be determined based at least in part on measurements from each of a plurality of meters. Changes in energy or power may be determined based at least in part on electrical transmissions measured at each of the phases of a feeder. A meter may be selected from among the plurality of meters. For each of the plurality of electrical phases, the changes in energy or power measured by the meter may be compared or correlated to the changes in energy or power measured at the feeder. A phase that is connected to the meter may be determined, from among the plurality of electrical phases, based at least in part on the comparisons or correlations.
    Type: Grant
    Filed: February 13, 2017
    Date of Patent: February 19, 2019
    Assignee: Itron, Inc.
    Inventors: Roberto Aiello, Patrick Amihood
  • Patent number: 10031166
    Abstract: An apparatus for electrical current measurement. The apparatus may include a power input such as a current transformer that can be magnetically coupled to a line being measured. The apparatus may also include an energy harvesting circuit to parasitically harvest energy from the current transformer and an energy metering circuit to measure the current on the line. A controller can control the switching of a dynamic switch between an energy harvesting mode and an energy metering mode. The apparatus may also include a wireless transceiver. A plurality of these apparatuses may be combined into a network of devices to relay information from multiple current meters to a data concentrator and ultimately the Internet.
    Type: Grant
    Filed: September 30, 2014
    Date of Patent: July 24, 2018
    Assignee: Lynary Enterprises Inc.
    Inventor: Michael Jordan Kadonoff
  • Patent number: 10002860
    Abstract: An integrated circuit includes at least one cell. The at least one cell includes a cell region defined by a cell boundary; a power line structure extending in a first direction parallel to and along the cell boundary and including a first power line extending in the first direction along the cell boundary, a plurality of metal islands spaced apart from one another over the first power line in the first direction, and a second power line extending in the first direction over the plurality of metal islands; and a signal line structure disposed in the cell region at the same level as the first power line and the plurality of metal islands. Separation distances between each of the plurality of metal islands and a part of the signal line structure at the same level as the plurality of metal islands are equal to or greater than a critical separation distance.
    Type: Grant
    Filed: December 15, 2016
    Date of Patent: June 19, 2018
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Raheel Azmat
  • Patent number: 9712418
    Abstract: Embodiments are directed to automatically controlling network and service quality across datacenters. In one scenario, a computer system identifies portions of work that are to be performed within the datacenter. The computer system creates a request for change (request) in a change management system, where the change management system is configured to store and manage the implementation of requests within the datacenter. Then, upon implementation of the created request, the computer system polls the status of the request to determine whether the portions of work identified in the request can now be performed and, upon determining that the portions of work identified in the request can be performed, the computer system performs the portions of work according to the request. Performance of the specified work according to a request allows for workflows to be controlled based on the request.
    Type: Grant
    Filed: May 26, 2015
    Date of Patent: July 18, 2017
    Assignee: Microsoft Technology Licensing, LLC
    Inventors: Daniel R. Cornell, William T. Boyd, Raymond Keith Linz, Karin Meier-Magruder, Bennett L. Warriner, David S. Riley, Charles McDaniels, III, George K. Ringer
  • Patent number: 9639327
    Abstract: A circuit for multiplying a digital signal by a variable gain, controlled in dependence on a digital gain control value. The circuit comprises: a multiplier input for receiving the digital signal; a multiplier output for outputting the digital signal multiplied by the gain; a plurality of multiplier stages each arranged to multiply by a respective predetermined multiplication factor; and switching circuitry arranged so as to apply selected ones of the multiplier stages in a multiplication path between the input and output, in dependence on the digital gain control value. The multiplication factors are arranged such that binary steps in the digital gain control value result in logarithmic steps in said gain.
    Type: Grant
    Filed: April 7, 2011
    Date of Patent: May 2, 2017
    Assignee: Nvidia Corporation
    Inventor: Stephen Felix
  • Patent number: 9564914
    Abstract: The present disclosure provides systems and methods for identifying changes in and failures of a reference voltage of an analog to digital (A/D) converter. A non-scalar function of the reference voltage of the A/D converter can be determined and output to the A/D converter. The A/D converter is configured to output a digital value to the A/D conversion system, wherein the digital value corresponds to the non-scalar function of the reference voltage. The A/D conversion system decodes the non-scalar function of the reference voltage with a corresponding inverse function, and may determine the drift factor associated with the reference voltage. The A/D conversion system can report a change in, or a failure of, the A/D converter or its reference voltage, and can operate or prevent operation of protection elements.
    Type: Grant
    Filed: March 24, 2016
    Date of Patent: February 7, 2017
    Assignee: Schweitzer Engineering Laboratories, Inc.
    Inventors: Travis C. Mallett, Ben M. Armstrong
  • Patent number: 9559714
    Abstract: In one respect, there is provided a method for analog-to-digital conversion. The method may include: receiving, at an analog-to-digital converter, an analog signal; determining, based on a total distortion caused by at least a sampler and an encoder, a sampling rate below the Nyquist rate and/or a quantization rate; and converting, by the analog-to-digital converter, the received analog signal to a digital signal by at least sampling at the determined sampling rate, when operation at the determined sampling rate does not worsen the total distortion. Related systems and articles of manufacture are also disclosed.
    Type: Grant
    Filed: April 22, 2016
    Date of Patent: January 31, 2017
    Assignee: The Board of Trustees of the Leland Stanford Junior University
    Inventors: Alon Kipnis, Andrea Goldsmith, Yonina C. Eldar
  • Patent number: 8612792
    Abstract: A device to measure power consumption includes a processor connected to a central processing unit (CPU) and a memory module, a switch for setting the power measurement device to measure either the power supplied to the CPU or the power supplied to the memory, and a display to show the results of such measurements.
    Type: Grant
    Filed: October 20, 2011
    Date of Patent: December 17, 2013
    Assignees: Hong Fu Jin Precision Industry (ShenZhen) Co., Ltd., Hon Hai Precision Industry Co., Ltd.
    Inventors: Ying-Bin Fu, Ting Ge, Ya-Jun Pan
  • Patent number: 8558534
    Abstract: An ECU detects a steering angle that is an absolute angle based on a sine signal and a cosine signal that are output from a steering sensor. The ECU includes a three-phase pulse generator that generates, based on the sine signal and the cosine signal, three-phase pulse signals that have edges corresponding to predetermined rotational angles and that are set in such a manner that the predetermined rotational angles corresponding to the respective edges do not overlap each other and are at regular intervals. A microcomputer has a function as a second rotational angle detector that calculates a steering angle based on the pulse signals.
    Type: Grant
    Filed: September 29, 2010
    Date of Patent: October 15, 2013
    Assignee: JTEKT Corporation
    Inventor: Akihiro Tomita
  • Patent number: 8456153
    Abstract: A digital multimeter automatically records measurements of electrical or physical parameters. The multimeter may record the measurements based on events such as the passage of time, fluctuations or deviations in the measurements, or user inputs. In some examples, the digital multimeter operates at a reduced power setting during automatic recording operations.
    Type: Grant
    Filed: August 14, 2008
    Date of Patent: June 4, 2013
    Assignee: Fluke Corporation
    Inventors: Anthony Garland, John Gilbert
  • Patent number: 8456152
    Abstract: A digital multimeter provides information regarding measurements shown on a display of the multimeter, and available functions of the multimeter. The information typically relates to a current context of the multimeter. The context may include a current mode or other setting of the multimeter.
    Type: Grant
    Filed: August 14, 2008
    Date of Patent: June 4, 2013
    Assignee: Fluke Corporation
    Inventors: Anthony Garland, Joseph Ferrante, Christopher Gloger
  • Patent number: 8350558
    Abstract: A system and method for measuring reactive power which uses a pair of quadrate carriers to add a 90 degree phase shift to a voltage path or a current path in a power meter. The quadrate carriers have the same frequency but are offset in phase from each other by 90 degrees.
    Type: Grant
    Filed: May 27, 2009
    Date of Patent: January 8, 2013
    Assignee: Analog Devices, Inc.
    Inventors: Yun [Yale] Ning, Xiuhong [George] Lu
  • Patent number: 8269481
    Abstract: A digital multimeter includes an auto-save component configured to automatically capture and save a sequence of measurements. The auto-save component detects when a measurement becomes stable and upon determining that the measurement has become stable, captures and saves the measurement in a memory of the digital multimeter. The multimeter may additionally include an auto-naming component for automatically assigning a name to each measurement in the sequence, and an auto-hold component for temporarily freezing the display of the stable measurements in the multimeter.
    Type: Grant
    Filed: August 14, 2008
    Date of Patent: September 18, 2012
    Assignee: Fluke Corporation
    Inventors: Anthony Garland, Bradey Honsinger, Joseph Ferrante, Christopher Gloger
  • Patent number: 8212549
    Abstract: An ammeter is provided with a plurality of individual wound coils interconnected in a generally U-shaped array to measure the magnitude of current in a conductor extending through a sensing region inside the U-shape. Additional pairs of position-sensing coils determine the position of the conductor relative to the sensing region and provide outputs to circuitry which permits the magnitude measurement to be displayed only if the conductor extends through the sensing region.
    Type: Grant
    Filed: February 18, 2009
    Date of Patent: July 3, 2012
    Assignee: HD Electric Company
    Inventors: William J. McNulty, James S. Buchanan, Connor M. McNulty
  • Patent number: 8198884
    Abstract: A digital multimeter displays a miniature version of a live actual reading of the multimeter. The miniature version typically appears after a larger version of the live actual reading is displaced by other display elements. The miniature version of the live actual reading may be accompanied by a warning icon or other graphical symbol to alert a user of a potentially hazardous electrical condition.
    Type: Grant
    Filed: August 14, 2008
    Date of Patent: June 12, 2012
    Assignee: Fluke Corporation
    Inventors: Anthony Garland, Joseph Ferrante, Brian Capoccia, Lindsey Berdan
  • Patent number: 8165835
    Abstract: A power measurement and calibration system provides power and line frequency measurements by using a bandpass filter having complex voltage and current outputs from which real and imaginary power components can be determined. Calibration of the filter may be omitted if a complex wavelet filter is used to implement the bandpass filter and a determination of line frequency can also be provided for downstream use. A processor receiving data from the output of the filter can compute real and imaginary power, power factor and the line frequency. The filter may be implemented by a processor executing program instructions, or a digital circuit implementing the filter and optionally a CORDIC rotator for computing the current-to-voltage phase relationship can provide input to the processor for power measurement and calibration of the sample rate to line frequency relationship and for other uses.
    Type: Grant
    Filed: October 27, 2008
    Date of Patent: April 24, 2012
    Assignee: Cirrus Logic, Inc.
    Inventors: Rahul Singh, Dale Brummel, Hang Liu, Robert Leon Gorsegner, Edwin De Angel, Jean Charles Pina
  • Patent number: 8076926
    Abstract: A digital multimeter comprises a rotary switch and a rotary switch memory. The rotary switch can be moved between a plurality of positions to change the function performed by the digital multimeter. When the rotary switch is in a particular position, a user can change the function currently associated with that position from a default function to a non-default function. Thereafter, when the user moves the rotary switch away from the particular and then subsequently moves the position back to the particular position, the multimeter resumes the non-default function without requiring further user-input.
    Type: Grant
    Filed: August 14, 2008
    Date of Patent: December 13, 2011
    Assignee: Fluke Corporation
    Inventors: Anthony Garland, Jeffrey Meyer, Bradey Honsinger, Joseph Ferrante, Brian Capoccia, Lindsey Berdan
  • Patent number: 8073642
    Abstract: A meter device for measuring electrical energy is provided. The meter device includes circuitry for measuring at least one parameter of electrical energy provided to the meter device. A storage device is provided for storing at least one calibration factor for compensating for errors associated with at least one of at least one external current transformer (CT) and at least one external potential transformer (PT) that operates on the electrical energy provided to the meter device. At least one processor is provided for processing the at least one calibration factor for adjusting the measuring for compensating for the errors when measuring the at least one parameter of electrical energy.
    Type: Grant
    Filed: February 8, 2010
    Date of Patent: December 6, 2011
    Assignee: Electro Industries/Gauge Tech
    Inventors: Frederick B. Slota, Andrew J. Werner
  • Publication number: 20110089934
    Abstract: Apparatus and methods for providing a voltage signal indicative of the voltage being supplied by each phase of a multiphase voltage being supplied to a load. For each phase, a phase to neutral voltage is produced by providing a virtual ground. For each phase, a phase to phase voltage is produced by determining a difference between a pair of phase to neutral voltages. Either the phase to neutral voltages or the phase to phase voltages for each phase are output depending on the configuration of the multiphase voltage being supplied to the load.
    Type: Application
    Filed: October 19, 2009
    Publication date: April 21, 2011
    Applicant: EATON CORPORATION
    Inventor: Michael Patrick KING
  • Patent number: 7904261
    Abstract: A method of state estimation is provided, including: (a) acquiring a plurality of positive sequence voltage and current phasor measurements; (b) designating a reference positive sequence voltage phasor measurement from the acquired phasor measurements; (c) correcting the acquired phasor measurements to account for the reference phasor measurement; (d) calculating complex power having a real component and an imaginary component, using the corrected positive sequence voltage and current phasor measurement; (e) using the real component of said complex power as a calculated mega-watt and the imaginary component of the complex power as a calculated mega-volt-ampere; and (f) using the mega-watt and mega volt-ampere calculations in a state estimation algorithm.
    Type: Grant
    Filed: August 24, 2007
    Date of Patent: March 8, 2011
    Assignee: British Columbia Hydro and Power Authority
    Inventors: Djordje Atanackovic, Greg S. Dwernychuk, Jose Clapauch
  • Patent number: 7821776
    Abstract: An electrical meter is provided that includes a cover configured for securement onto a base. The meter includes features that resist meter tampering, and features that provide evidence of meter tampering.
    Type: Grant
    Filed: March 25, 2009
    Date of Patent: October 26, 2010
    Assignee: Elster Electricity, LLC
    Inventors: Garry M. Loy, Rodney C. Hemminger
  • Patent number: 7746051
    Abstract: A voltmeter/phaser includes dual hot-stick probes, each carrying a housing including a digital display, one of the housings also having a measurement circuit for measuring the sensed voltage. A plural-conductor cable interconnects the housings and carries, in two separate conductors, current between the probes and display data between the display circuits, so that identical voltage values are always displayed on the two displays.
    Type: Grant
    Filed: February 18, 2009
    Date of Patent: June 29, 2010
    Assignee: HD Electric Company
    Inventors: James S. Buchanan, William J. McNulty
  • Patent number: 7747400
    Abstract: An arrangement includes an A/D converter and a processing circuit. The A/D converter is configured to generate digital samples of voltage and current waveforms in a polyphase electrical system. The processing circuit is operably coupled to receive the digital samples from the A/D converter. The processing circuit is further configured to combine a value substantially equal to two times the magnitude of the phase A current sample with the phase C current sample to generate a first value, and generate a VA calculation using the first value and at least one other value. The processing circuit is further configured to provide information representative of the VA calculation to one of a group consisting of a display, a communication circuit, and a billing calculation unit.
    Type: Grant
    Filed: October 9, 2007
    Date of Patent: June 29, 2010
    Assignee: Landis+Gyr, Inc.
    Inventor: John Voisine
  • Patent number: 7679356
    Abstract: A digital multimeter having improved recording functionality is disclosed. The digital multimeter disclosed incorporates a rotary switch, a series of keys and buttons, and a digital display so as to provide highly integrated, programmable and configurable features. Several of these features, either taken alone or in combination, provide significant improvements in ease of use, speed of user operation, and safety associated with use of the instrument.
    Type: Grant
    Filed: August 14, 2007
    Date of Patent: March 16, 2010
    Assignee: Fluke Corporation
    Inventors: Anthony C. Garland, Bradey David Honsinger, Jeffrey William Meyer, Joseph Victor Ferrante, John Michael Gilbert, Christopher Paul Gloger, Mathew James Martineau, Nathaniel Jeremiah Wetzel, Brian Michael Capoccia
  • Patent number: 7660682
    Abstract: A meter device for measuring electrical energy is provided. The meter device includes circuitry for measuring at least one parameter of electrical energy provided to the meter device. A storage device is provided for storing at least one calibration factor for compensating for errors associated with at least one of at least one external current transformer (CT) and at least one external potential transformer (PT) that operates on the electrical energy provided to the meter device. At least one processor is provided for processing the at least one calibration factor for adjusting the measuring for compensating for the errors when measuring the at least one parameter of electrical energy.
    Type: Grant
    Filed: November 30, 2007
    Date of Patent: February 9, 2010
    Assignee: Electro Industries/Gauge Tech
    Inventors: Frederick B. Slota, Andrew J. Werner
  • Patent number: 7626375
    Abstract: A digital multimeter with a rotary switch having a plurality of positions, each of the positions corresponding to a primary measurement function to be performed. An LCD displays secondary functions or modes corresponding to the positions of the rotary switch and values determined by performing one of the measurement functions. The multimeter includes default functions for each position of the rotary switch that may be changed to other functions or modes. When the other functions or modes are set in a first position, the rotary switch is moved to a second position, and returned to the first position the multimeter restores the functions and/or modes set when the rotary switch was previously in the first position.
    Type: Grant
    Filed: August 14, 2007
    Date of Patent: December 1, 2009
    Assignee: Fluke Corporation
    Inventors: Anthony C. Garland, Joseph Victor Ferrante, Brian Michael Capoccia, Lindsey Berdan, Bradey David Honsinger, Jeffrey William Meyer
  • Patent number: 7609051
    Abstract: An energy consumption meter includes a first input for providing a first input signal derived from a voltage, a first analog-to-digital (A/D) converter electrically connected to the first input to generate a first output signal based on the first input signal, a second input for providing a second input signal derived from a current, a second A/D converter electrically connected to the second input to generate a second output signal based on the second input signal, a multiplier to combine signals corresponding to the first and second output signals, and a phase evaluation block having two inputs that are electrically connected to the first input and to the second input. The phase evaluation block measures a phase difference that corresponds to a phase difference between the first input signal and the second input signal. A phase correction block corrects for the phase difference in one of the first output signal and the second output signal.
    Type: Grant
    Filed: November 12, 2004
    Date of Patent: October 27, 2009
    Assignee: Austriamicrosystems AG
    Inventors: Gerhard Fritz, Erwin Schmalzl
  • Patent number: 7584067
    Abstract: An apparatus for measuring average power consumption of a computer system includes a current to voltage converter for receiving an operating current of the computer system and transforming the operating current into a voltage signal; an analog-digital converter connected to the current to voltage converter for receiving the voltage signal, and converting the voltage signal into a digital signal indicating a value of the operating current; a micro controller unit connected to the analog-digital converter for receiving the digital signal, and calculating a value of the average power consumption of the computer system during a determined period of time, the value of the average power consumption being converted into a display-driving signal; and a display module connected to the micro controller unit for receiving the display-driving signal, and displaying the value of the average power consumption.
    Type: Grant
    Filed: May 16, 2007
    Date of Patent: September 1, 2009
    Assignees: Hong Fu Jin Precision Industry (ShenZhen) Co., Ltd., Hon Hai Precision Industry Co., Ltd.
    Inventors: Xiao-Zhu Chen, Zhen-Xing Ye
  • Patent number: 7563999
    Abstract: A test switch is provided having front and rear sides. The test switch includes a base to which a plurality of switch units are mounted. A row of upper terminals are removably mounted to the base, above the switch units, and a row of lower terminals are removably mounted to the base below the switch units. The upper and lower terminals are adapted for connection to wiring from the front side of the test switch. Upper and lower covers are releasably attached to the base and extend across the rows of upper and lower terminals, respectively.
    Type: Grant
    Filed: March 14, 2007
    Date of Patent: July 21, 2009
    Assignee: ABB Technology Ag
    Inventors: Roy Ball, Todd Alan Gentile, Timothy Frankland Masters
  • Patent number: 7538570
    Abstract: An integrated circuit is provided with a distributed supply voltage monitoring system in which a single controller controls a plurality of voltage monitors located in respective modules of the integrated circuit. The controller and each circuit form a successive approximation analogue to digital converter Such a system enables a small size monitoring circuit to be realized for every module of the integrated circuit.
    Type: Grant
    Filed: April 20, 2006
    Date of Patent: May 26, 2009
    Assignee: NXP B.V.
    Inventors: Marcel Pelgrom, Violeta Petrescu, Hendrickus Joseph Maria Veendrick
  • Patent number: 7528595
    Abstract: A three-phase monitoring system for detecting and dynamically correcting wiring errors in an electrical circuit. The system includes a voltage divider circuit and a current transformer circuit connected to three voltage channels and three current channels, respectively. Samples of the voltages and currents are held in respective sample and hold circuits, which are provided to an analog multiplexer. The analog multiplexer is controlled by a processor, and is coupled to gain and filter circuitry, sample and hold circuitry, and to an analog-to-digital converter (ADC). The ADC is connected to the processor, which analyzes the power factor for a given voltage/current pair. If the power factor is outside of an expected range, the processor dynamically changes the addresses assigned to the channels such that the data arrives in the processor in an expected sequence.
    Type: Grant
    Filed: May 16, 2006
    Date of Patent: May 5, 2009
    Inventor: Avery Long
  • Publication number: 20090066317
    Abstract: The present invention is a meter for recording voltage and current on a transformer. The device has a housing with a body portion and a lever portion, the lever portion being movable between a closed position wherein the lever portion abuts the body portion and an open position wherein the lever portion is positioned away from the body portion. The device includes a pair of current sensors each current sensor being divided into two corresponding sensor fractions with one fraction of each sensor formed on the body portion of the housing and the other corresponding fraction formed on the lever portion of the housing. The fractions of each sensors are constructed such that each of the current sensors have a central opening dimensioned to receive one of the transformer terminals when the lever portion of the housing is in its first position. The current sensors are positioned on the housing such that the meter can be mounted to the terminals of the transformer.
    Type: Application
    Filed: July 11, 2008
    Publication date: March 12, 2009
    Inventor: Eric de Buda
  • Patent number: 7502698
    Abstract: A single-phase, 3-wire watthour meter which can measure power consumption, alter a contract capacity, control the stop/start of power supply/distribution, and easily update programs from a higher-level control apparatus by providing a central processing unit, a storing means, a communicating means and various interfaces, can measure, for example, every 0.2 sec, a currents (ia and ib) running through 100V T-phase and R-phase, voltages (v1 and v2) between T-N and between R-N and a current (i3) and a voltage (v3) under a 200V load, determine a 100V power consumption by W100=(ia?i3)·v1+(ib?i3)·v2 and a 200V power consumption by W200=i3·v3, and measure the detailed behavior of a power consumption by totaling a power consumption every 30 min, interlocks with a gas leakage detector and a fire alarm, can control the opening/closing of rain doors and shutters and the operation/stop of Internet home electric appliances, and enables low-cost communication by means of dynamic IP Address-based communication.
    Type: Grant
    Filed: July 5, 2005
    Date of Patent: March 10, 2009
    Assignee: IP Power Systems Corporation
    Inventors: Yasuhiro Uenou, Tetsuya Yano
  • Publication number: 20080218155
    Abstract: A method for stabling a voltage, a pulse frequency modulating circuit and a power supply using the same are provided. The method includes the following steps. First, a comparing signal is provided. Then, set the comparing signal to be a first logic state when the voltage to be stabilized is lower than a preset voltage. Next provide a pulse signal when the comparing signal is set in the first logic state. Afterwards, adjust the enable time of the pulse signal based on the number of times of logic state changing of the comparing signal within a preset period and, adjust the voltage according to the enable time of the pulse signal.
    Type: Application
    Filed: April 19, 2007
    Publication date: September 11, 2008
    Applicant: ORISE TECHNOLOGY CO., LTD.
    Inventors: Yen-Lin Huang, Kuei-Kai Chang, Ming-Chien Li
  • Patent number: 7412338
    Abstract: An energy measurement system including a radio frequency (“RF”) device powered by a solar panel. The RF device comprising a wireless communication port operative to transmit and receive communication over a wireless network of additional RF devices. The energy measurement system able to transmit energy parameters of the RF device over the wireless network.
    Type: Grant
    Filed: March 18, 2005
    Date of Patent: August 12, 2008
    Assignee: Power Measurement Ltd.
    Inventors: Arthur B. Wynans, Daniel Alan Cumming, Michael E. Teachman, Eric K. Haight, Daniel N. Loewen, Martin A. Hancock, Colin N. Gunn
  • Patent number: 7359809
    Abstract: The data storage and processing resources required for an electric meter are reduced by basing the selection and application of phase error correction on a root mean square load current flowing through the meter.
    Type: Grant
    Filed: August 11, 2005
    Date of Patent: April 15, 2008
    Assignee: Veris Industries, LLC
    Inventor: David A. Bruno
  • Patent number: 7302752
    Abstract: A method of making and using an extended test switch starting with a previously existing un-extended test switch that is ready for connection to electrical devices to be tested. A housing selected from one or more available housings each having a predetermined length is connected to a modified un-extended test switch. Each housing has a rear wall that has several inwardly and outwardly facing terminals. At least one of the rear facing terminals of the un-extended test switch is connected to an associated one of the inwardly facing terminals of the housing. After manufacture the extended test switch can be mounted in a suitable receptacle for connection to at least one electrical device. One or more of the switches on the front of the un-extended test switch to be left in an operational condition with a clear cover attached to the front of the test switch.
    Type: Grant
    Filed: September 23, 2004
    Date of Patent: December 4, 2007
    Assignee: ABB Inc.
    Inventor: Roy Ball
  • Patent number: 7274305
    Abstract: A system for managing collection of data and remote operation of fielded remote units is disclosed. The remote units may be incorporated in automatic meter reading systems, capacitor bank switching systems, power line fault detection units, power recloser units, surveillance systems, railroad switch heaters, or any of a multitude of systems wherein widely scattered devices require monitoring and/or operational commands. Each remote unit is provided with a CELLEMETRY™ transceiver, allowing the unit to receive commands from and pass data to a data center via the cellular control channel network and the Internet. The data center is organized to provide data related to a particular service to an associated customer user via the Internet, the customer users being utility companies, railroad companies, surveillance companies, and the like.
    Type: Grant
    Filed: July 1, 2004
    Date of Patent: September 25, 2007
    Assignee: Carina Technology, Inc.
    Inventor: Clyde K. Luttrell
  • Patent number: 7259547
    Abstract: A system and method for dynamically lock the sample rate of an analog to digital (ADC) converter to an input frequency. Specifically, a system for measuring power is disclosed. The system includes an ADC converter, a measuring module, an ADC cycle counter, and a calculation block coupled together. The ADC converter samples an analog input line signal. The measuring module measures a predetermined number of line cycles of the analog input line signal. The ADC cycle counter measures an actual sample count of the analog input line signal by the ADC converter over the predetermined number of line cycles. The calculation block determines an error rate between the actual sample count and an ideal sample count that is based on a predetermined over sample rate.
    Type: Grant
    Filed: June 24, 2005
    Date of Patent: August 21, 2007
    Assignee: Cypress Semiconductor Corporation
    Inventors: Kevin Summers, Mark E. Hastings
  • Patent number: 7079961
    Abstract: A test system and method having a test channel and an additional channel, and wherein the ratio of amplitude and phase between the interference current through the device under test and the interference signal on the additional channel are determined. The system further applies a voltage at or near line frequency to the device under test, and then continuously subtracts the additional interference signal from the current signal through the device under test. In doing so, the system and method allows accurate measurements of the real and reactive power of an impedance at or very close to the line frequency.
    Type: Grant
    Filed: August 18, 2004
    Date of Patent: July 18, 2006
    Assignee: Hubbell Incorporated
    Inventor: Thomas M. Grun
  • Patent number: 6940268
    Abstract: Methods and apparatus for supplying power for use in metering electrical energy over a wide range of voltages with a single meter are disclosed. The wide ranging meter includes a processing unit for processing divided input voltage and a current component in order to determine electrical energy metering values. The processing unit is operable in response to supply voltages. A power supply, connected to receive the undivided voltage component, generates the supply voltages over the wide dynamic range. It is especially preferred for the power supply to include a transformer having first, second and third windings, wherein the undivided voltage component is provided to the first winding and wherein the second winding defines the output of the power supply. A switching member is connected to the first winding for permitting and preventing the flow of current in response to a control signal. A control member generates the control signal in response to the output of the power supply.
    Type: Grant
    Filed: July 11, 2003
    Date of Patent: September 6, 2005
    Assignee: Elster Electricity, LLC
    Inventors: Rodney C. Hemminger, Mark L. Munday, Fred F. Schleifer
  • Patent number: 6927564
    Abstract: A multimeter instrument for measuring variables, such as electrical current, voltage, or resistance includes touch-sensitive zones for selection of the variable to be measured. The measurement circuit associated with the variable selected with the aid of touch-sensitive selection zones is activated by the zone selected.
    Type: Grant
    Filed: July 17, 2003
    Date of Patent: August 9, 2005
    Assignee: Chauvin Arnoux
    Inventors: Daniel Arnoux, Axel Arnoux, Claude Genter
  • Patent number: 6828771
    Abstract: An electric power meter measures the value of an electrical power parameter, e.g., Universal Apparent Power or Universal Power Factor, of an electrical power signal in the time domain by: calculating a first instantaneous power component as the product of an instantaneous voltage signal and an instantaneous current signal of the electrical power signal, carrying out a relative phase shift between the instantaneous voltage signal and the instantaneous current signal; and calculating a second instantaneous power component as the product of the relatively phase-shifted instantaneous voltage and instantaneous current signals. The first and second instantaneous power components are then RMS averaged to determine their respective magnitudes. Both of the calculated magnitudes are then used to determine the value of the electrical power parameter. The method can alternatively be implemented in the frequency domain to produce equivalent measurement values.
    Type: Grant
    Filed: June 5, 2000
    Date of Patent: December 7, 2004
    Assignee: Electric Power Research Limited
    Inventor: Foroozan Ghassemi
  • Patent number: 6798187
    Abstract: A power transfer arrangement is provided for supplying power from a generator to the electrical system of a building in the event of a utility power interruption. The power transfer arrangement has a power transfer switching mechanism adapted for interconnection with the building electrical system and includes a cabinet having panel structure provided with various electrical components for transferring power to various load circuits. The power transfer arrangement is improved by a generator status information display mounted on the cabinet for separately measuring and simultaneously displaying actual wattage and voltage supplied by the generator to the load circuits.
    Type: Grant
    Filed: September 26, 2001
    Date of Patent: September 28, 2004
    Assignee: Reliance Controls Corporation
    Inventor: Neil A. Czarnecki
  • Patent number: 6753678
    Abstract: The present invention is a voltage detector that is capable of measuring AC voltages, especially the high voltages encountered by electric utility linemen, with improved accuracy. To obtain these improvements in accuracy the present invention includes a novel circuit, which can be incorporated into a standard digital voltage detector. This circuit is able to accurately determine the magnitude of external capacitive reactance, which allows the voltage detector to compensate for variances in the external capacitive reactance that, if uncompensated, could adversely affect the voltage measurement; consequently, this invention provides the user with an AC voltage detector having improved accuracy characteristics.
    Type: Grant
    Filed: October 3, 2002
    Date of Patent: June 22, 2004
    Inventor: Walter S. Bierer
  • Patent number: 6617839
    Abstract: Disclosed is a method for detecting saturation of a current transformer. The method determines whether or not a change of a secondary current generated in a current transformer is due to the saturation of the current transformer.
    Type: Grant
    Filed: August 23, 2002
    Date of Patent: September 9, 2003
    Inventors: Yong-Cheol Kang, Sang-Hee Kang, Seung-Hun Ok
  • Patent number: 6441602
    Abstract: An exemplary embodiment of the invention is a method for evaluating jitter of a phase locked loop circuit generating a phase locked loop output signal. The method includes generating a test initiate signal and generating a trigger signal in response to the test initiate signal. The trigger signal is synchronized with the phase locked loop output signal. A disturbance signal is generated to induce jitter in the phase locked loop output signal. The jitter in the phase locked loop output signal is then evaluated.
    Type: Grant
    Filed: September 26, 2000
    Date of Patent: August 27, 2002
    Assignee: International Business Machines Corporation
    Inventors: James P. Eckhardt, Keith A. Jenkins
  • Patent number: 6275021
    Abstract: The invention relates to an electricity meter with signal channels that are passed to a digital signal processing device and each of which has a multiplexer with downstream analog/digital converter. Voltage signals of an electrical consumer can be connected to a first input of the analog/digital converter of the first signal channel, and current signals of the electrical consumer can be connected to a first input of the analog/digital converter of the second signal channel. In order to allow the meter to be used without any circuit variation both as a four-conductor meter and as a three-conductor meter, one of the voltage signals can be connected to a second input of the analog/digital converter of the first signal channel.
    Type: Grant
    Filed: September 28, 1999
    Date of Patent: August 14, 2001
    Assignee: Siemens Aktiengesellschaft
    Inventor: Klaus Windsheimer
  • Patent number: 6229295
    Abstract: An apparatus for metering electrical energy over a predetermined range of voltages within a single meter. The meter includes a divider network for dividing the voltage to generate a divided voltage. The divided voltage is substantially linear with minimal phase shift over the wide dynamic range. A processing unit processes the divided voltage and a current component to determine metered electrical power. A power supply receives the voltage component and generates a supply voltage from the voltage component over the predetermined range to power the processing unit. The power supply may include a transformer having first, second and third windings, so that the voltage component is provided to the first winding and the second winding defines the output of the power supply. A switching member is connected to the first winding for permitting and preventing the flow of current through the first winding.
    Type: Grant
    Filed: March 25, 1998
    Date of Patent: May 8, 2001
    Assignee: ABB Power T&D Company Inc.
    Inventors: Rodney C. Hemminger, Mark L. Munday, Fred F. Schleifer
  • Patent number: 6147484
    Abstract: A device for measuring power, or other circuit parameters, of an alternating current load. The device has an ammeter and voltmeter for measuring voltage across the device and current through the device. The device also has a known impedance element that is switchably connected across the load. The ammeter is used to provide a second current measurement with the impedance so connected. These measurements, together with the known impedance value, are use to calculate power, the power factor, impedance, or some other parameter associated with the load.
    Type: Grant
    Filed: July 8, 1998
    Date of Patent: November 14, 2000
    Inventor: Richard T. Smith