WO1998054583A1 - Compteur de biens de consommation - Google Patents

Compteur de biens de consommation Download PDF

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Publication number
WO1998054583A1
WO1998054583A1 PCT/GB1998/001506 GB9801506W WO9854583A1 WO 1998054583 A1 WO1998054583 A1 WO 1998054583A1 GB 9801506 W GB9801506 W GB 9801506W WO 9854583 A1 WO9854583 A1 WO 9854583A1
Authority
WO
WIPO (PCT)
Prior art keywords
consumption meter
circuit
commodity
meter
circuitry
Prior art date
Application number
PCT/GB1998/001506
Other languages
English (en)
Inventor
Alan John Jones
Jonathan David Mills
Timothy Robert Joyce
Original Assignee
Abb Metering Systems Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Abb Metering Systems Limited filed Critical Abb Metering Systems Limited
Priority to EP98922959A priority Critical patent/EP0985152A1/fr
Priority to NZ501263A priority patent/NZ501263A/en
Publication of WO1998054583A1 publication Critical patent/WO1998054583A1/fr
Priority to NO995781A priority patent/NO995781L/no

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D4/00—Tariff metering apparatus
    • G01D4/002—Remote reading of utility meters
    • G01D4/004—Remote reading of utility meters to a fixed location
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R21/00—Arrangements for measuring electric power or power factor
    • G01R21/133—Arrangements for measuring electric power or power factor by using digital technique
    • G01R21/1333—Arrangements for measuring electric power or power factor by using digital technique adapted for special tariff measuring

Definitions

  • This invention relates to commodity consumption meters, such as for example water, gas
  • Commodity consumption meters have traditionally measured, and kept a record of, the number of relevant units of commodity consumed since the installation of the meter. Settlement of the consumer's account often took place quarterly, requiring regular inspections of the meter by the commodity supplier to determine the number of units of commodity consumed.
  • Electricity consumption meters have been developed which can communicate with the commodity supplier by way of radio transmission, a consumer's telephone link, by mains-borne signalling or by other means thereby reducing the need for regular inspection of the meter.
  • prepayment meters into which the consumer places money, tokens or other forms of credit and the meter continues to provide the commodity whilst credit is present.
  • Such meters can be particularly useful in rented premises where frequent
  • Designing meters is costly since they must meet stringent regulations laid down by the appropriate authorities and must be approved by those authorities before they can be installed onto the electrical system.
  • a modular electricity meter which comprises a basic meter to which add-on modules can be attached.
  • the basic meter module can measure consumption of electricity and keep a running total of the number of units of electricity used which is displayed on a liquid crystal display (LCD).
  • the basic meter also includes an optical communications port
  • the add-on modules include a further display for displaying the information appropriate to the ancillary function provided by the add-on module.
  • the addition of this display thus renders the display on the basic meter redundant and it is known to arrange the casing of the add-on module to physically obscure the display of the basic meter.
  • the present invention has arisen in an endeavour to provide a commodity consumption meter which is flexible and can accommodate future metering needs and which at least in part overcomes the limitations of the known arrangements.
  • a commodity consumption meter of a type to which add-on circuitry can be attached to provide at least one function
  • said commodity consumption meter comprising: an electrical circuit having metering means for
  • an interface circuit for controlling data supplied to a display which is connectable to said interface circuit wherein the interface circuit is operable in a first mode of operation to relay consumption data from the metering means to the display and is operable in a second mode of operation to provide data to the display from the add-on circuitry which is connectable to an
  • Constructing a meter in accordance with the invention enables a whole family of meters to be constructed all of which are based on an electrical circuit which is common to
  • the provision of the interface circuit enables a meter to be constructed which uses a single display and consequently the only cost in terms of redundant components is in the inclusion of some additional icons on the display.
  • the interface circuit is further operable to relay consumption data from the measuring means to the add-on circuitry via the additional connection.
  • additional processing of the consumption data is required such as for example for multi-tariff meters, that is, a meter in which the cost for a given unit of the commodity is different at different times of the day, or on different days, or where the consumption data recorded in the electrical circuit is to be transmitted by the add-on circuitry to a remote point such as, for example, in remote meter reading applications.
  • circuitry and in the event of not receiving a recognised stimulus is operable to generate
  • an error signal is used to reset the add-on circuitry into a valid mode of operation.
  • the interface circuit is operable in a calibration mode to pass
  • circuitry ensuring the meter can be accurately calibrated within the tolerance of the
  • the commodity consumption meter further comprises a sealed housing in
  • the additional connection is only accessible from within the sealed housing and the add-on circuitry
  • the commodity consumption meter comprises an electricity consumption
  • the electrical circuit includes means for detecting a fault condition in the
  • the commodity consumption meter further comprises
  • non- volatile memory non- volatile memory and the electrical circuit is operable to store the consumption data
  • the electrical circuit advantageously generates an error signal when a fault condition in the electricity supply is detected, and said signal is passed to the additional connection, thereby activating the add-on circuitry to take any necessary
  • the electricity meter's input comprises respective inputs for electrical
  • the measuring means comprises means for converting said signals to digital signals and processing means for processing the digital signals to produce a value representative of the electrical power consumed.
  • the commodity consumption meter comprises, for example, a water or gas consumption meter.
  • the electrical circuit preferably comprises an integrated circuit.
  • the term 'integrated circuit' is to be construed broadly and thus includes not only circuits which are formed on a single substrate, such as silicon, but also those which comprise a number of separate semi-conductor chips mounted on a common substrate such as for example a ceramic substrate. It will be appreciated therefore that the term 'integrated circuit' refers to a circuit which is formed as a single package as opposed to a circuit constructed from a number of discrete components.
  • FIG. 1 is a schematic representation of an electricity meter in accordance with the invention.
  • Figure 2 is a schematic of the metering circuit of the meter shown in Figure 1;
  • Figure 3 is a schematic representation of the meter of Figure 1 with add-on circuitry
  • Figure 4 is a schematic representation of an electricity meter according to a preferred embodiment of the invention.
  • the meter 2 comprises a sealed housing 4 for preventing unauthorised access to the interior workings of the meter.
  • ASIC application specific integrated circuit
  • LCD liquid crystal display
  • power supply unit 10 a power supply unit 10
  • shunt resistor 12 a potential divider arrangement comprising resistors 14 and 16 and a module connector generally denoted 18.
  • the ASIC 6 includes a metering circuit 20, control logic (or interface logic) 22, a non-
  • volatile memory 24 volatile memory 24; a display driver circuit 26 and a serial to parallel (S/P) interface 28.
  • S/P serial to parallel
  • control logic 22 and memory 24 are each connected to a data
  • the control logic 22 is connected to the driver circuit 26 and S P interface 28 by a respective data bus 32, 34 as shown in Figure 1.
  • the module connector 18 has a number of connections which are denoted "data in”, “data out”, “data ck”, “pulse out”, “Vcc” and “OV” in the Figure. The function of these connections is described later.
  • the meter 2 measures the electrical energy being consumed by measuring the voltages v ; and v v occurring across the shunt resistor 12 and the resistor 14
  • the shunt resistor 12 conveniently comprises a manganin resistor such that its resistance is substantially invariant of its temperature and provides an accurate measurement over the full operating current range of the meter.
  • the shunt resistor 12 has a resistance of approximately 100 ⁇ such that it produces a voltage v ; of 10 mV relative to the live supply rail for a load current of 100 amps rms.
  • the resistors 14 and 16 are 10 k ⁇ and 2.4 M ⁇ respectively giving a voltage of 1 volt rms relative to the live rail (denoted ) when operating with a 240 volts rms supply.
  • FIG. 1 A schematic representation of the metering circuit 20 is shown in Figure 2.
  • analogue to digital (A/D) converter 36 within which it is sampled at regular intervals under the control of a clock signal "ck" derived from a clock generator 38.
  • the A/D converter produces two outputs; the first (indicated as "magnitude” in Figure 2) is a quantised digital representation corresponding to the instantaneous ratio of the
  • the reference voltage V ref is generated within the ASIC 6 by a reference
  • the current representative voltage signal v is applied to a sigma-delta ( ⁇ ) modulator
  • the accumulator/divider 46 is arranged to either add the
  • the count in the accumulator/divider 46 thus changes in proportion to the product of the instantaneous voltage v v and current v ; supplied, i.e. in proportion to the power supplied to the load.
  • the accumulator/divider 46 produces a pulse at its output each time its count exceeds a predetermined count and is calibrated such that it produces a known number of pulses
  • the pulsed signal from the accumulator/divider 46 is used to increment either a first counter 48a or a second counter 48b depending on the status of a rate select switch 44.
  • the two counters 48a and 48b are provided to enable the meter to operate at two different tariffs.
  • each counter 48 stores the number of units of electricity consumed for a respective tariff.
  • the operation of the rate select switch 44 is determined by a control line denoted "tariff select" which is taken to a connection which is accessible from outside the meter's sealed housing to which an external time switch can be connected.
  • tariff select a control line denoted "tariff select" which is taken to a connection which is accessible from outside the meter's sealed housing to which an external time switch can be connected.
  • the accumulator/divider 46 uses a calibration constant to define the predetermined count which is stored in the non- volatile memory 24 and can be loaded
  • a light emitting diode (LED) 50 (which is shown in Figure 1) which is visible from
  • the LED 50 gives a visual indication to the consumer that the meter is functioning and allows him/her to check the meter accuracy.
  • the pulsed output from the accumulator/divider 46 is also connected to a respective connection, denoted "pulse out", of the module connector 18.
  • connector 18 can be utilised by the manufacturer to accurately set the calibration of the
  • the meter calibration can be adjusted by loading a new calibration constant into the non-volatile memory 24 via the module connector 18 and control logic 22.
  • the clock signal "ck" is also used in other parts of the circuit 6 of the meter.
  • the clock is used to derive the multiplexing signal for the display driver 26, which in the embodiment shown is a 120 Hz square wave signal.
  • the multiplexed connection between display driver 26 and display 8 is preferred, it will be appreciated that this is not essential to the present invention.
  • a multiplexed connection (sixteen electrical connections in the example shown for a forty-eight segment four backplane display) has the advantage of a reduced number of output pins on ASIC 6, thus making the ASIC 6 cheaper to manufacture, but this saving in cost is achieved at the expense of increased complexity in both the display driver 26 and the LCD 8.
  • the PSU 10 is connected between the live L h and neutral N ⁇ supply lines and provides
  • Vcc, 0V 5V supply to the ASIC 6 and to the module connector 18.
  • This arrangement allows power to be supplied to add-on circuitry (not shown) when it is connected to the module connector 18 thereby avoiding the need for the add-on circuitry to be provided with an internal power supply or to be connected to the mains electricity supply.
  • the metering circuit 20 measures
  • the memory 24 via the data bus 30 and is copied when a failure of the mains electricity supply is detected.
  • the value of the counter 48 is set using the information in the non- volatile memory 24.
  • a first mode of operation of the meter that is when no add-on circuitry is connected to the meter, the count from counter 48 is transferred via the control logic 22 and data buses 30 and 32 to the display driver 26.
  • the LCD 8 thus displays the total number of units consumed since the installation of the meter.
  • the meter 2 thus functions as a basic electricity consumption meter in this first mode of operation.
  • the display driver 26 can be arranged to display the contents of each counter 48a and 48b
  • the module 54 is a four tariff remote meter reading module and enables the meter to log electricity consumption for four tariffs and to be read and programmed remotely using radio transmission.
  • the add-on module 54 comprises a serial to parallel interface 56, a microprocessor 58, a memory 60 (which comprises both volatile and non-volatile parts) and a transceiver arrangement 62 which are connected as shown in the figure.
  • the transceiver 62 enables the commodity provider to communicate with the add-on
  • the microprocessor 58 instructs the meter to operate in a second mode of operation.
  • the way in which the module instructs the meter to operate in the second mode is described below. In this second mode of operation the add-on circuitry controls the data being sent to the display 8 and the display 8 no longer simply displays the total number of units consumed.
  • the microprocessor 58 uses the "pulse out” connection of the connector 18 or directly reads the contents of the meter counters 48 using the serial interface "data in", “data out” and “data ck” connection of the connector 18 and, in conjunction with the tariff information stored in memory 60, calculates the requisite information such as, for example, the total value of electricity consumed in terms of
  • the microprocessor 58 passes elements of this information via the "data in", "data ck"
  • control logic 22 thus acts as an interface and passes information from the module connector 18 to the display 8.
  • microprocessor 58 can be used to cycle the information appearing on the display 8.
  • the display 8 can cycle through displaying the total number of units used
  • the meter 2 can be operated in any combination
  • circuitry is preferably located within the sealed housing 4 of the meter to prevent
  • the meter 2 determines when a module 54 has been connected as follows. By default on powering up the meter the interface logic 22 is automatically configured to operate
  • logic/control logic 22 controls the flow of data to the display 8 either from the counter
  • control logic 22 is
  • the mode of operation of the meter is thus determined
  • the module connector 18 and control/interface logic 22 have an important part to play in the initial calibration and testing of the meter 2 after manufacture.
  • the scaling of the meter 2 is initially set by writing a default calibration
  • the meter can then be tested with a
  • the interface logic circuit 22 is also operative to provide the test equipment (not shown) with the values stored in the counters 48 of the metering circuit 20, via the "data out" connection of connector 18, in order to confirm that correct increments of that register are occurring for a predetermined amount of energy consumed.
  • the meter can be upgraded by opening the sealed housing of the meter and replacing the add-on circuitry 54 without the need to discard the ASIC 6 or display 8 which constitute a substantial proportion of the
  • the present invention provides support for highly complex add-on circuitry whilst providing basic metering functions in the form of a single integrated
  • a basic meter may be produced which can be adapted to meet future needs.
  • the ASIC 6 further includes a power supply monitor 64 and a
  • microprocessor watchdog circuit 66 microprocessor watchdog circuit 66.
  • the power supply monitor 64 is operable to detect a likely collapse of the DC power supply to the electrical circuit, such
  • the PSU 10 includes storage/smoothing capacitors which conveniently comprise polarised electrolytic type capacitors of a few hundred microfarads.
  • the instantaneous voltage on the storage capacitors rises as they are charged by current flowing forward through the rectifying means of the PSU 10 and will decay when the rectifier is not conducting but whilst the electrical circuit continues to draw current.
  • the PSU 10 provides a constant DC voltage output (Vcc, 0V) irrespective of the varying voltage on the reservoir capacitors.
  • Vcc, 0V constant DC voltage output
  • the instantaneous voltage on the reservoir capacitors will typically be in the range 7 volts to 10 volts. In the event that the mains supply fails the
  • the add-on circuitry 54 On receipt of this signal the add-on circuitry 54 likewise saves its data to the non-volatile part of the memory 60. The electrical energy needed
  • the power supply monitor 64 is operable to interrupt the current flow to be LED 50, display driver circuit 26 and parts of the metering circuit 20.
  • the counters 48 are set to their previous value from the data saved to the memory 24.
  • the "watch-dog” circuit 66 is operable to monitor for the continuing operation of the microprocessor 58 of the add-on circuitry 54.
  • the "watch-dog” produces a reset pulse, denoted “reset”, at a set time interval if it does not receive a recognised stimulus/data signal from the microprocessor 58 indicating that the microprocessor is operating correctly.
  • the microprocessor 58 of the add-on circuitry is programmed to generate the recognised
  • this data signal is recognised by the interface logic 22 as representing the address of the watch-dog circuit 66. In the event that the microprocessor malfunctions it will cease to generate this repetitive data signal and the timer in the watch-dog circuit will then run to its end-state
  • This reset signal is passed via a respective connection "reset" of the module connector 18 to the microprocessor forcing
  • microprocessor into a known starting condition.
  • the microprocessor will thereby
  • the watch-dog circuit 66 When no module is connected to the meter the watch-dog circuit 66 will continue to generate a reset signal every two seconds.
  • circuit' is to be construed broadly and thus includes not only circuits
  • module connector 18 is not accessible from outside the meter's sealed housing 4 and the add-on circuitry/module 54 is located within the
  • interface logic or control logic 22 which enables the meter to operate as both a basic meter and to co ⁇
  • the interface circuit 22 is operable in a first mode of operation to pass
  • circuit to operate as a basic meter and is further operable in a second mode of
  • the add-on circuitry 54 thereby enabling the meter to use a single display for a wide
  • the interface circuit 22 also enables the meter to be tested and calibrated by loading

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
  • Indication And Recording Devices For Special Purposes And Tariff Metering Devices (AREA)

Abstract

L'invention concerne un type de compteur (2) de biens de consommation auquel on peut adjoindre un circuit additionnel (54) dans le but de créer au moins une fonction auxiliaire à la mesure de la consommation desdits biens. Ce compteur comporte un circuit électrique (6) doté d'une unité de mesure (20) destinée à mesurer la consommation desdits biens et ce, en réponse à au moins un signal électrique (vi et vv) appliqué au niveau d'une entrée dudit circuit; et un circuit d'interface (22) destiné à réguler les données acheminées jusqu'au niveau d'un affichage (8) qui peut être connecté à l'interface (22). Le circuit d'interface (22) peut fonctionner selon un premier mode de fonctionnement permettant de relayer les données de consommation provenant de l'unité de mesure (20) jusqu'à l'affichage (8); et selon un second mode de fonctionnement permettant d'acheminer les données provenant du circuit additionnel (54), connecté à une connexion supplémentaire (18) au circuit, au niveau de l'affichage (8).
PCT/GB1998/001506 1997-05-27 1998-05-22 Compteur de biens de consommation WO1998054583A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP98922959A EP0985152A1 (fr) 1997-05-27 1998-05-22 Compteur de biens de consommation
NZ501263A NZ501263A (en) 1997-05-27 1998-05-22 Commodity consumption meter with interface for display driver and add on processing element
NO995781A NO995781L (no) 1997-05-27 1999-11-25 Handelsvareforbruksmåler

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB9710912.8A GB9710912D0 (en) 1997-05-27 1997-05-27 Commodity consumption meters
GB9710912.8 1997-05-27

Publications (1)

Publication Number Publication Date
WO1998054583A1 true WO1998054583A1 (fr) 1998-12-03

Family

ID=10813117

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1998/001506 WO1998054583A1 (fr) 1997-05-27 1998-05-22 Compteur de biens de consommation

Country Status (5)

Country Link
EP (1) EP0985152A1 (fr)
GB (2) GB9710912D0 (fr)
NO (1) NO995781L (fr)
NZ (1) NZ501263A (fr)
WO (1) WO1998054583A1 (fr)

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19962435A1 (de) * 1999-12-22 2001-07-05 Siemens Metering Ag Zug Elektrizitätszähler mit einem zusätzlichem Rechenmodul
EP1460435A1 (fr) * 2003-03-19 2004-09-22 ITF Fröschl GmbH Compteur de consommation avec un module de mesure interchangeable
WO2006021119A1 (fr) * 2004-08-23 2006-03-02 Landis+Gyr Ag Appareil electrique presentant une possibilite de connexion de module
US7477998B2 (en) 2005-01-20 2009-01-13 Electro Industries/Gauge Tech System and method for providing universal additional functionality for power meters
US7508190B2 (en) 2004-10-20 2009-03-24 Electro Industries/Gauge Tech. Test pulses for enabling revenue testable panel meters
US7660682B2 (en) 2004-10-18 2010-02-09 Electro Industries/Gauge Tech System and method for compensating for potential and current transformers in energy meters
US8348148B2 (en) 2011-02-17 2013-01-08 General Electric Company Metering infrastructure smart cards
US8878517B2 (en) 2005-01-27 2014-11-04 Electro Industries/Gauge Tech Intelligent electronic device with broad-range high accuracy
US9194898B2 (en) 2005-01-27 2015-11-24 Electro Industries/Gauge Tech Intelligent electronic device and method thereof
US9989618B2 (en) 2007-04-03 2018-06-05 Electro Industries/Gaugetech Intelligent electronic device with constant calibration capabilities for high accuracy measurements
US10260903B2 (en) 2004-10-05 2019-04-16 Electro Industries/Gauge Tech Meter having a communication interface for receiving and interfacing with a communication device
US10345416B2 (en) 2007-03-27 2019-07-09 Electro Industries/Gauge Tech Intelligent electronic device with broad-range high accuracy
US10585125B2 (en) 2015-05-27 2020-03-10 Electro Industries/ Gaugetech Devices, systems and methods for data transmission over a communication media using modular connectors
US10628053B2 (en) 2004-10-20 2020-04-21 Electro Industries/Gauge Tech Intelligent electronic device for receiving and sending data at high speeds over a network
US10641618B2 (en) 2004-10-20 2020-05-05 Electro Industries/Gauge Tech On-line web accessed energy meter
US10845399B2 (en) 2007-04-03 2020-11-24 Electro Industries/Gaugetech System and method for performing data transfers in an intelligent electronic device
US11307227B2 (en) 2007-04-03 2022-04-19 Electro Industries/Gauge Tech High speed digital transient waveform detection system and method for use in an intelligent electronic device
US11366143B2 (en) 2005-01-27 2022-06-21 Electro Industries/Gaugetech Intelligent electronic device with enhanced power quality monitoring and communication capabilities
US11366145B2 (en) 2005-01-27 2022-06-21 Electro Industries/Gauge Tech Intelligent electronic device with enhanced power quality monitoring and communications capability
US11516899B2 (en) 2015-05-27 2022-11-29 Electro Industries/Gauge Tech Devices, systems and methods for electrical utility submetering
US11644490B2 (en) 2007-04-03 2023-05-09 El Electronics Llc Digital power metering system with serial peripheral interface (SPI) multimaster communications
US11686749B2 (en) 2004-10-25 2023-06-27 El Electronics Llc Power meter having multiple ethernet ports

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Cited By (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19962435A1 (de) * 1999-12-22 2001-07-05 Siemens Metering Ag Zug Elektrizitätszähler mit einem zusätzlichem Rechenmodul
EP1460435A1 (fr) * 2003-03-19 2004-09-22 ITF Fröschl GmbH Compteur de consommation avec un module de mesure interchangeable
WO2006021119A1 (fr) * 2004-08-23 2006-03-02 Landis+Gyr Ag Appareil electrique presentant une possibilite de connexion de module
US11815365B2 (en) 2004-10-05 2023-11-14 Ei Electronics Llc Meter having a communication interface for receiving and interfacing with a communication device
US10260903B2 (en) 2004-10-05 2019-04-16 Electro Industries/Gauge Tech Meter having a communication interface for receiving and interfacing with a communication device
US8073642B2 (en) 2004-10-18 2011-12-06 Electro Industries/Gauge Tech System and method for compensating for potential and current transformers in energy meters
US7660682B2 (en) 2004-10-18 2010-02-09 Electro Industries/Gauge Tech System and method for compensating for potential and current transformers in energy meters
US10628053B2 (en) 2004-10-20 2020-04-21 Electro Industries/Gauge Tech Intelligent electronic device for receiving and sending data at high speeds over a network
US11754418B2 (en) 2004-10-20 2023-09-12 Ei Electronics Llc On-line web accessed energy meter
US10641618B2 (en) 2004-10-20 2020-05-05 Electro Industries/Gauge Tech On-line web accessed energy meter
US7508190B2 (en) 2004-10-20 2009-03-24 Electro Industries/Gauge Tech. Test pulses for enabling revenue testable panel meters
US11686749B2 (en) 2004-10-25 2023-06-27 El Electronics Llc Power meter having multiple ethernet ports
US7477998B2 (en) 2005-01-20 2009-01-13 Electro Industries/Gauge Tech System and method for providing universal additional functionality for power meters
US9410822B2 (en) 2005-01-20 2016-08-09 Electro Industries/Gauge Tech System and method for providing universal additional functionality for power meters
US7953565B2 (en) 2005-01-20 2011-05-31 Electro Industries/Gauge Tech System and method for providing universal additional functionality for power meters
US9903895B2 (en) 2005-01-27 2018-02-27 Electro Industries/Gauge Tech Intelligent electronic device and method thereof
US11366143B2 (en) 2005-01-27 2022-06-21 Electro Industries/Gaugetech Intelligent electronic device with enhanced power quality monitoring and communication capabilities
US8878517B2 (en) 2005-01-27 2014-11-04 Electro Industries/Gauge Tech Intelligent electronic device with broad-range high accuracy
US9194898B2 (en) 2005-01-27 2015-11-24 Electro Industries/Gauge Tech Intelligent electronic device and method thereof
US10823770B2 (en) 2005-01-27 2020-11-03 Electro Industries/Gaugetech Intelligent electronic device and method thereof
US11366145B2 (en) 2005-01-27 2022-06-21 Electro Industries/Gauge Tech Intelligent electronic device with enhanced power quality monitoring and communications capability
US10345416B2 (en) 2007-03-27 2019-07-09 Electro Industries/Gauge Tech Intelligent electronic device with broad-range high accuracy
US11307227B2 (en) 2007-04-03 2022-04-19 Electro Industries/Gauge Tech High speed digital transient waveform detection system and method for use in an intelligent electronic device
US10845399B2 (en) 2007-04-03 2020-11-24 Electro Industries/Gaugetech System and method for performing data transfers in an intelligent electronic device
US11635455B2 (en) 2007-04-03 2023-04-25 El Electronics Llc System and method for performing data transfers in an intelligent electronic device
US11644490B2 (en) 2007-04-03 2023-05-09 El Electronics Llc Digital power metering system with serial peripheral interface (SPI) multimaster communications
US9989618B2 (en) 2007-04-03 2018-06-05 Electro Industries/Gaugetech Intelligent electronic device with constant calibration capabilities for high accuracy measurements
US8348148B2 (en) 2011-02-17 2013-01-08 General Electric Company Metering infrastructure smart cards
US10585125B2 (en) 2015-05-27 2020-03-10 Electro Industries/ Gaugetech Devices, systems and methods for data transmission over a communication media using modular connectors
US11516899B2 (en) 2015-05-27 2022-11-29 Electro Industries/Gauge Tech Devices, systems and methods for electrical utility submetering

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GB9810924D0 (en) 1998-07-22
GB2327274A (en) 1999-01-20
EP0985152A1 (fr) 2000-03-15
NZ501263A (en) 2001-06-29
GB2327274B (en) 2000-03-08
NO995781D0 (no) 1999-11-25
NO995781L (no) 2000-01-27
GB9710912D0 (en) 1997-07-23

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