WO2014190389A1 - Système de mesure intelligent de point limite - Google Patents

Système de mesure intelligent de point limite Download PDF

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Publication number
WO2014190389A1
WO2014190389A1 PCT/AU2014/000571 AU2014000571W WO2014190389A1 WO 2014190389 A1 WO2014190389 A1 WO 2014190389A1 AU 2014000571 W AU2014000571 W AU 2014000571W WO 2014190389 A1 WO2014190389 A1 WO 2014190389A1
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WO
WIPO (PCT)
Prior art keywords
electrical
unit
energy metering
base unit
communications
Prior art date
Application number
PCT/AU2014/000571
Other languages
English (en)
Inventor
Marcelo Demarco
Marcello Dominic CIRCOSTA
Paul Robert COLLINS
Ian Jackson DAVIS
Justin Clifford MATTHEWS
Keith Mario Torpy
Zheng Zhu
Original Assignee
Landis & Gyr Pty Ltd
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
Priority claimed from AU2013901964A external-priority patent/AU2013901964A0/en
Application filed by Landis & Gyr Pty Ltd filed Critical Landis & Gyr Pty Ltd
Publication of WO2014190389A1 publication Critical patent/WO2014190389A1/fr

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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
    • G01R22/00—Arrangements for measuring time integral of electric power or current, e.g. electricity meters
    • G01R22/06—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods
    • G01R22/10—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods using digital techniques

Definitions

  • the present invention relates to an energy metering system. Background of the Invention
  • Electronic meters often use meters to determine an amount of energy used by, for example, a household.
  • electronic meters need to be replaced more often than electro-mechanical metering systems, which leads to increased disruption and cost for utilities and the power user as the entire metering system is reguired to be replaced.
  • electronic meters are constantly being improved to provide more functionality.
  • technological advances are changing the electrical environment in which electronic meters operate. These factors are influencing the product life cycle of electronic meters, making upgrading of electronic meters an increasingly more regular occurrence.
  • an electrical energy metering system comprising:
  • a base unit that is arranged to be electrically
  • At least one energy metering unit that is arranged to determine an amount of energy consumed or produced by the at least one electrical circuit
  • the electrical energy metering system is arranged such that each of the at least one energy metering unit and the at least one additional functional unit are releasably engagable with the base unit wherein, when the at least one energy metering unit is engaged with the base unit, the at least one energy metering unit is electrically coupled to the base unit so as to facilitate the determination of an amount of energy consumed or produced by the at least one electrical circuit;
  • the electrical energy metering system is arranged such that the at least one energy metering unit can be engaged with, or disengaged from, the base unit while the base unit is electrically coupled between the electrical power supply and the at least one electrical circuit, and while the at least one additional functional unit is engaged with the base unit .
  • the electrical circuit may be a load circuit, or it may be a supply circuit, such as a solar energy supply circuit.
  • the at least one additional functional unit may be a further energy metering unit, a controller unit, a communications unit, or any other appropriate unit that provides a function associated with the electrical energy metering system.
  • electrically couplable and the term “electrically coupled” are intended to mean that two elements are capable of making an electrical connection when connected to a power source, but does not necessarily imply that the power source must be present and/or providing power.
  • the at least one energy metering unit can be engaged with, or disengaged from, the base unit while the base unit is electrically coupled between the electrical power supply and the at least one electrical circuit can facilitate replacement of the energy metering unit without requiring replacement of the entire energy metering system.
  • Such an arrangement can facilitate reducing disruptions and costs associated with replacing energy metering systems.
  • the at least one electrical circuit may be replaced to facilitate installation of a replacement energy metering unit,
  • the electrical energy metering system may comprise a
  • each energy metering unit being arranged to determine an amount of energy consumed or produced by a respective electrical circuit and to be releasably engagable with the base unit, the electrical energy metering system being arranged such that each energy metering unit can be engaged with, or disengaged from, the base unit while the base unit is electrically coupled between the electrical power supply and the electrical circuits.
  • a single base unit can be used to facilitate metering of a plurality of electrical circuits. This also facilitates increasing a number of electrical circuits that are to be monitored after the initial installation of the energy metering system.
  • the energy metering system can be installed such that it is electrically coupled between the mains power supply and a single electrical circuit, the energy metering system comprising a single energy metering unit. If a further electrical circuit is then later electrically coupled to the energy metering system, then a further energy metering unit can be coupled to the energy metering system for metering the further load circuit.
  • the electrical energy metering system may further comprise a controller unit, the controller unit being arranged to receive power from the base unit and to control at least one function of the electrical energy metering system, the controller unit being arranged such that it is releasably engagable with the base unit, wherein the electrical energy metering system is arranged such that the controller unit can be engaged with, or disengaged from, the base unit while the base unit is electrically coupled between the power supply and the load circuit.
  • at least a part of the controller unit is isolated from a high voltage side of the base unit, for example by an isolating transformer.
  • the electrical energy metering system may further comprise at least one communications unit, the at least one
  • communications unit being arranged to receive power from the base unit or the controller unit and to communicate
  • the communications unit being arranged such that it is releasably engagable with the base unit, wherein the electrical energy metering system is arranged such that the communications unit can be engaged with, or disengaged from, the base unit while the base unit is electrically coupled between the power supply and the electrical circuit.
  • the communications unit can be arranged to communicate any appropriate information associated with the at least one electrical circuit, such as the
  • the at least one communications unit is electrically isolated from a high voltage side of the base unit, for example by an isolating transformer or via an isolating capacitor.
  • the electrical energy metering system may comprise a
  • the communications unit is arranged to communicate information associated with the at least one electrical circuit to a communications network associated with a supplier of the electrical power supply, and a second communications unit is arranged to communicate information associated with the at least one electrical circuit to a communications network associated with a user of the electrical power supply.
  • the supplier may be a generator of electrical power, an electrical power supply network
  • the at least one communications unit is electrically coupled to the electrical power supply so as to facilitate power line communications (PLC) .
  • PLC power line communications
  • communications unit may be electrically coupled to the electrical power supply to facilitate PLC in an isolated manner, such as via an isolating transformer, isolating capacitor, or via an isolation barrier which may be a component of the communications unit.
  • the controller unit may be arranged to facilitate at least some communications functionality. In this way, if the energy metering system comprises a plurality of communications units, then common communications
  • functionality of the plurality of communications units can be implemented by the controller unit thereby reducing the complexity of the communications units.
  • the communications unit comprises a physical layer interface and the controller unit is arranged to process a baseband signal that is received at, or that is to be transmitted by, the physical layer interface of the communications unit.
  • the physical layer interface is a radio transceiver and the controller unit is arranged to perform software defined radio processing on radio signals received from, or to be transmitted by, the radio transceiver of the communications unit.
  • Providing a controller unit that is arranged to implement software defined radio processing in respect of radio signals received and/or transmitted by a communications unit is advantageous as different and/or further radio standards can be used by upgrading software associated with the controller unit rather than requiring replacement of the communications unit. It will be appreciated that the communications unit may be arranged to implement software defined radio processing in respect of radio signals received and/or transmitted by the radio transceiver.
  • the electrical energy metering system may be arranged for use with a single phase electrical network, or for use with a three phase electrical network
  • an energy metering unit that is arranged to determine an amount of energy consumed or produced by at least one electrical circuit
  • the energy metering unit being arranged so as to be releasably engagable with a base unit that is electrically couplable between an electrical power supply and the at least one electrical circuit, the energy metering unit further being arranged so as to be electrically couplable directly between the electrical power supply and the at least one electrical circuit wherein, when the energy metering unit is electrically coupled to the base unit or directly coupled between the electrical power supply and the at least one electrical circuit, the energy metering unit is arranged so as to facilitate the determination of an amount of energy consumed or produced by the at least one electrical circuit .
  • the present invention provides an electrical meter comprising: a base unit that connects to a site electrical system and an electrical distribution network, the base unit defining an interface between the site and an electrical utility, and a plurality of functional modules that engage with the base unit, the functional modules including a metrology unit that measures a quantity of electrical energy exchanged between the site and the electrical utility, the metrology unit being releasably engagable with the base unit independent of the other functional modules.
  • Figure 1 is a block diagram of an electrical energy metering system in accordance with an embodiment of the present invention
  • Figure 2a is a front view of two electrical energy metering systems having different form factors in accordance with embodiments of the present invention
  • Figure 2b is a front view of the electrical energy metering systems of Figure 2a wherein covers have been removed to show internal components;
  • Figure 3 is a block diagram of the electrical energy metering system of Figure 1;
  • Figure 4 is a block diagram of a load metering module of the electrical energy metering system of Figure 1;
  • Figure 5 is a schematic block diagram of the electrical energy metering system of Figure 1;
  • FIG. 6 is a schematic diagram of the electrical energy metering system of Figure 1.
  • an electrical energy metering system 100 comprising a base unit 102.
  • the base unit 102 is arranged so as to be electrically couplable between an electrical power supply, such as a mains power supply, and at least one electrical circuit, for example the electrical network of a home.
  • the base unit 102 is also arranged to receive units, for example individual self- contained modules, for use in performing energy metering of the at least one electrical circuit, and in performing related functions such as communicating energy metering information to a supplier of the electrical power.
  • the electrical circuit may be a load circuit, or it may be a supply circuit, such as a solar energy supply circuit.
  • the various modules of the electrical energy metering system 100 are releasably engagable with the base unit 102 such that the base unit 102 need not be replaced when an individual module is upgraded, modified or replaced.
  • the module can be disengaged from the base unit 102 and a new module can be engaged with the base unit 102 in the original module's place.
  • conventional electrical energy metering systems would typically reguire the entire metering system to be replaced when an energy metering component of the system is reguired to be replaced. Examples of different types of modules that can be received by the base unit 102 will now be described in more detail.
  • the electrical energy metering system 100 comprises a plurality of energy metering modules 104, including a plurality of load metering modules 106 and a supply metering module 108.
  • the metering modules 104 are electrically coupled to the mains power supply and the load circuits via terminal modules 110.
  • supply terminal modules 112 connect the mains power supply to the supply metering module 108
  • load terminal modules 114 connect each load circuit to its respective load metering module 106.
  • Providing terminal modules 110 is advantageous as, compared to conventional electricity meters, terminals are not integrated and permanently fixed to the electricity meter. The terminal modules 110 can therefore be replaced, removed or added as required independently of the rest of the electrical energy metering system 100.
  • Additional load terminal modules 114 can be added to the electrical energy metering system 100 for connecting to additional load circuits as needed.
  • the electrical energy metering system 100 may have a plurality of load terminal modules 114 pre-installed such that additional load circuits can be connected to the electrical energy metering system 100 as the load circuits become available.
  • additional load metering modules 106 can be added to the electrical energy metering system 100 for metering additional load circuits as needed.
  • the load metering modules 106 can be upgraded or replaced without requiring the entire electrical energy metering system 100 to be replaced.
  • the load metering modules 106 are arranged to be releasably engagable with the base unit 102, and the base unit 102 is arranged to receive the load metering modules 106 such that the load metering modules 106 can be removed and replaced without requiring the base unit 102 to be removed from its point of installation, and without requiring other parts of the electrical energy metering system 100 to be removed/replaced .
  • the load metering modules 106 are electrically coupled to a metering module bus 116 that is arranged to transfer
  • the metering modules 106 are powered by an isolated power supply that is also electrically coupled to the metering module bus 116 for use by the load metering modules 106.
  • Each load metering module 106 is also in communication with a communications bus of the metering module bus 116 to facilitate the communication of information in respect of the respective load circuits including, for example, energy used by the respective load circuits of each load metering module 106.
  • the supply metering module 108 is similar to the load metering modules 106 although it may also comprise a
  • the supply metering module 108 may also be arranged to provide total Wh measurement, a full disconnect relay, customer supply monitoring, harmonics monitoring and other features as desired.
  • the supply metering module 108 is also used to route the supply voltage to the other modules of the electrical energy metering system 100, can include a contactor or relay for disconnecting the mains power supply if required, and can include a metering element to facilitate monitoring of the mains power supply by a power user.
  • the electrical energy metering system 100 also comprises a controller module 118 and a communications module 120.
  • the controller module 118 is arranged to facilitate, amongst other things, transferring information obtained from the metering modules 104 to the communications module 120, and may perform at least some functions associated with the communications module 120 such as a software defined radio function and/or other communications functions that a plurality of communications modules 120 may have in common.
  • each of the controller and communications modules 118, 120 receive power from at least one power supply that may be electrically coupled in an isolated manner to a mains power supply bus 122.
  • the at least one power supply is isolated from the high voltage side of the mains power supply bus 122 by appropriate means, in this example by an isolating trans former .
  • the controller and communications modules 118, 120 are arranged to be releasably engagable with the base unit 102, and the base unit 102 is arranged to receive the controller and communications modules 118, 120 such that the controller and communications modules 118, 120 can be removed and replaced without requiring the base unit 102 to be removed from its point of installation.
  • the base unit 102 comprises a sturdy weather ⁇ proof casing housing electrical connections such as the metering module bus 116 and possibly the mains power supply bus 122 to facilitate power distribution to the terminal, metering, controller and communications modules 104, 110, 118, 120 and to facilitate communication between modules as required.
  • the base unit 102 is constructed so as to have a relatively long rated life, typically greater than 30 years. Some of the modules, such as the metering, controller and communications modules 104, 118, 120 that are received by the base unit 102 typically have a shorter rated life span than the base unit 102, and require replacement or upgrade more frequently than the base unit 102. Therefore a single base unit 102 can be installed, for example using a three-point mechanical installation method, and used over its service life with individual modules 104, 110, 118, 120 being replaced or upgraded as needed.
  • Such a modular system can provide cost benefits to power suppliers and power users. Further, installation of some of the modules, particularly modules that are isolated from the high voltage side of the mains power supply, can be replaced or upgraded by a technician rather than requiring a qualified electrician to perform the work. It will be appreciated, however, that replacing or upgrading modules that are not isolated from the high voltage side of the system 100, for example the load metering modules 106, should be performed by a qualified electrician as deemed necessary by regulations.
  • the electrical energy metering system 100 of Figure 1 can be provided in standard configurations.
  • the base unit 102 can be provided in standard electrical meter form factors to facilitate standard installation at new sites or replacement of existing electrical meters.
  • FIG. 2a shows the electrical energy metering systems 200, 202 having respective covers 204, 206 in place.
  • Figure 2b shows the electrical energy metering systems 200, 202 with their respective covers 204, 206 removed, revealing an internal layout of each electrical energy metering system 200, 202.
  • the first electrical energy metering system 200 has a slimmer form factor than the second 202.
  • the base unit 102 of the first electrical energy metering system 200 is dimensioned so as to receive a single load metering module 106 and a
  • the first electrical energy metering system 200 also comprises a controller module 118 and a single communications module 120.
  • the base 102 of the first electrical energy metering system 200 is arranged to receive only one load metering module 106 and a respective load terminal module 114, the first electrical energy metering system 200 would be
  • the base 102 is also arranged to receive only one communications module 120, in this case arranged to communicate information obtained from the load meter module 106 to the supplier of the electrical power.
  • Each module of the first electrical energy metering system 200 is replaceable without requiring the base unit 102, or other modules of the system 200, to be removed and/or
  • the second electrical energy metering system 202 has a wider form factor and provides the capacity to meter more load circuits than the first electrical energy metering system 200.
  • the second electrical energy metering system 202 is also arranged to receive more than one communications module 120.
  • the base unit 102 of the second electrical energy metering system 202 is arranged so as to receive three load metering modules 106 and respective load terminal modules 114, and a supply metering module 108 and respective supply terminal modules 112.
  • the second electrical energy metering system 202 also comprises a controller module 118 and two communications modules 120, 120' .
  • the second electrical energy metering system 202 would be appropriate for metering the energy usage of a power user who desires to meter separate load circuits, or who would like the option of metering separate load circuits in the future.
  • the base 102 is also arranged to receive first and second communications modules 120, 120' .
  • the first communications module 120 is arranged to communicate information obtained from the load meter module 106 to the supplier of the electrical power.
  • the second communications module 120' is arranged to facilitate communications between the electrical energy metering system 202 the power user. For example, the power user could monitor and plan energy use via a web page that has been served to the power user via a wireless network that is in communication with the second communications module 120' .
  • each module of the second electrical energy metering system 202 is replaceable without requiring the base unit 102 to be removed and/or replaced.
  • FIG. 3 shows a block diagram of the electrical energy metering system 100.
  • the load metering modules 106 are in communication with the controller module 118 via the communications bus, and are arranged to receive power from an AC-DC power supply module 310 of the controller module 118 via a DC and/or AC power bus of the metering module bus 116.
  • the controller unit 118 comprises a number of functional blocks that facilitate its various functions, and is arranged to receive power and data communication connections from the communications modules 120, 120' when the communications modules 120, 120' are installed.
  • the controller module 118 comprises a microcontroller (MCU) 302 that is arranged to control various aspects of the electrical energy metering system 100.
  • MCU microcontroller
  • the MCU 302 is based on the ARM architecture, although it will be appreciated that the MCU 302 may be based on any appropriate microcontroller architecture.
  • the MCU 302 is arranged to facilitate reconfiguration of the manner in which the MCU 302 is based on the ARM architecture, although it will be appreciated that the MCU 302 may be based on any appropriate microcontroller architecture.
  • the MCU 302 is arranged to facilitate reconfiguration of the manner in which the
  • the controller module 118 interfaces with the communications modules 120, 120' .
  • the MCU 302 may provide a programmable digital signal processor for implementing software defined radio (SDR) , allowing the MCU 302 to handle multiple and/or different radio standards as required.
  • SDR software defined radio
  • the MCU 302 comprises a communications module 304 that is arranged to receive information in respect of the load circuits associated with the respective load metering modules 106, for example energy usage information.
  • the information in respect of the load circuits may also be stored by the MCU 302 for later use and/or communicated to the communications modules 120, 120' to facilitate
  • the MCU 302 also comprises software defined radio (SDR) modules 306.
  • SDR software defined radio
  • the SDR modules 306 are arranged to perform typical radio communications processing functions using software that would traditionally be handled by hardware. This provides the advantage of allowing radio communications to be upgraded and/or changed by applying a software update rather than requiring new hardware to be installed. For example, if a new or different radio communications standard is to be utilised by the electrical energy monitoring system 100, software that implements communication processing associated with the new or different radio communications standard can be loaded into the SDR modules 306 for use by the communications modules 120, 120'.
  • the communications modules 120, 120' are in communication with the MCU 302 to facilitate communicating with the power supplier and/or the power user.
  • the supplier may be a generator of electrical power, an electrical power supply network operator, an electrical power supply retailer, or any other appropriate supplier of electrical power.
  • Each communications module 120, 120' comprises a
  • communications front end 308 for transmitting and receiving information wirelessly, such as via radio signals, and/or sending and receiving information via a wired network, for example via a data connection or via power line
  • each communications front end 308 comprises a wireless interface, such as a radio
  • transceiver and/or appropriate wired interfaces.
  • a communications module 120, 120' If a communications module 120, 120' is transmitting and receiving radio signals, the radio signals are processed by the SDR modules 306 of the MCU 302. Such an arrangement reduces the complexity of the communications modules 120, 120' as the communications modules only function as
  • the first communications module 120 is arranged to communicate energy usage information to the power supplier via a local area network (LAN) .
  • LAN local area network
  • the communications module 120' is arranged to communicate energy usage information to the power user via a home area network (HAN) .
  • HAN home area network
  • the first communications module 120 may be arranged to communicate with a first LAN
  • the second communications module 120' may be arranged to communicate with a second LAN
  • each communications module 120, 120' may be arranged to communicate with a common LAN such that the failure or replacement of one of the
  • the communications modules 120, 120' are coupled to the mains power supply bus 122 so as to facilitate power line communications.
  • the communications modules 120, 120' may be coupled to the mains power supply bus 122 in an isolated manner, for example via an isolating transformer .
  • At least one of the communications modules 120, 120' can be arranged to receive metering information from a metering device that is remote from the electrical energy metering system 100.
  • a metering device that is remote from the electrical energy metering system 100.
  • the communications module 120' that communicates with the HAN can receive energy consumption information associated with the appliance.
  • the information can be communicated to the controller module 118 and accessed by the power user as required, for example via a web page served to the power user via the HAN.
  • the controller module 118 also comprises an AC-DC power supply module 310 that is arranged to convert alternating current (AC) received via the mains power supply bus 122 into direct current (DC) for use by the load metering modules 106, the control module 118 and the communications modules 120, 120' .
  • the AC-DC power supply module 310 is electrically coupled to the DC power bus of the metering module bus 116 to provide power to the load metering modules 106.
  • the AC-DC power supply module 310 is also electrically coupled to the controller module 118 to provide power thereto.
  • controller module 118 is arranged to route power to the communications modules 120, 120' .
  • the system 100 may also be arranged to route AC power to the communications modules 120, 120' and/or metering modules 106 as required.
  • the controller module 118 may also comprise a display, such as a liquid crystal display (LCD) to facilitate manual inspection of power usage information obtained by the electrical energy metering system 100, and/or to provide information to a technician testing or upgrading a module of the electrical energy metering system 100.
  • the controller module 118 may also provide a data communications module arranged to facilitate communications via any appropriate means, such as optical, WLAN, Bluetooth to enable a user or technician to communicate with the controller module 118, for example to perform a firmware upgrade.
  • a load metering module 106 will now be described in more detail with reference to Figure 4 which shows a top view and a side view of the load metering module 106.
  • the load metering module 106 comprises a body 402 that is arranged to slide into and engage with the base unit 102 when installed.
  • the body 402 may also comprise a disengagable clip or a guick release clamp (not shown) , that is arranged to interact with a corresponding portion of the base unit 102 to facilitate locking the body 402 into place when installed into the base unit 102. Disengaging the clip or quick release clamp can facilitate removing the load metering module 106 as desired.
  • the load metering module 106 comprises a terminal 404 that is arranged to electrically couple with its respective load terminal module 114 when engaged with the base unit 102.
  • the terminal 404 is electrically coupled to a disconnect module 406, which may be a relay or a short circuit type disconnect module, to facilitate electrically disconnecting the load circuit from the electrical energy metering system 100 while the load metering module 106 is engaged with the base unit 102.
  • the disconnect module 406 may be tripped in response to a detected circuit overload, or in response to a control signal received from a meter PCBA interface module 408.
  • the PCBA interface module 408 comprises a
  • the PCBA interface module 408 also comprises an MCU that is arranged to control the various functions of the load metering module 106.
  • the PCBA interface module 408 is arranged to receive control signals originating from the controller module 118 for controlling the disconnect module 406, and to transfer voltage from the active line to a metering element 410, which in turn transfers the voltage from the active line to the disconnect module 406.
  • the metering element 410 is arranged to measure current consumed by its respective load circuit and to communicate this information to the meter PCBA interface 408 with which the metering element 410 is in communication.
  • the metering element 410 can measure current consumed by the load circuit by any appropriate means, for example by a circuit utilising a current transformer, or a shunt. Using this information, the MCU of the PCBA interface module 408 determines an amount of energy consumed by its respective load circuit.
  • Each load metering module 106 is arranged to accumulate energy usage information, allowing it to be used in the absence of a controller module 118. This facilitates work being performed on the controller module 118 without
  • each load metering module 106 is arranged to determine Watt hour, volt-ampere reactive hour, voltage, current, freguency and power factor information associated with its respective load circuit.
  • the electrical energy metering system 100 may also comprise a neutral metering module 500, an example of which is shown in the schematic diagram of Figure 5.
  • the neutral metering module 500 is similar to the load metering modules 106 and can be used to detect potential faults at the supply side.
  • the neutral metering module comprises a neutral integrity (NI) current transformer 502 arranged between the active and neutral lines.
  • the NI current transformer 502 is arranged to compare the active line and the neutral line to determine an earth current. Such a comparison can be used to determine whether a fault exists.
  • the neutral metering module 500 can communicate information associated with the determined earth current to the controller module 118, wherein the controller module 118 is arranged to compare the determined earth current to a predetermined threshold.
  • Figure 5 also shows a mains circuit protector 504 arranged between the active and neutral lines of the mains power supply .
  • the load metering module 106 and/or neutral metering module 500 may be arranged to independently measure electrical properties of the load circuit without the need to be engaged with any other part of the energy metering system 100. This facilitates the need for users of the energy metering system 100 to ensure that measurement accuracy is maintained.
  • the load metering module 106 and/or neutral metering module 500 can be designed such that their accuracy is insensitive to normal variations that would be expected between one energy metering system 100 and another. Such variations may include physical dimensions, orientation, light levels, electrical signal levels, electromagnetic radiation, temperature, magnetic fields and others. If metering modules 106 and 500 have their accuracy verified at the time of manufacturing, as required by regulators and customers, it follows that the metering modules will remain accurate when engaged with the base unit 102. It also follows that accuracy will be
  • the load metering module 106 and/or neutral metering module 500 may be arranged to indicate via the PCBA interface module 408. This may be achieved by varying an electrical signal present on one of the conductors of the PCBA interface module 408 that would normally connect to the bus 116.
  • the load metering module 106 and/or neutral metering module 500 may comprise a light emitting diode (LED) that is arranged to flash at a rate proportional to the value of a measured quantity.
  • the load metering module 106 and/or neutral metering module 500 may be arranged to allow light to pass through part of the body 402 or the body 402 may have a hole through which the LED can protrude.
  • the load metering module 106 and/or neutral metering module 500 may be arranged to derive their own power from the active and neutral conductors. These conductors would be present on either the metering module bus 116 and/or the mains power supply bus 122.
  • Figure 6 shows a schematic wiring diagram of the internal components of the electrical energy metering system 100, and particularly shows how components of the system 100 can be isolated from the high voltage side of the mains power supply.
  • a metering module power supply 602 of the AC-DC power supply module 310 is arranged to receive power from the mains power supply bus 122 via an isolating transformer 604.
  • the metering module power supply 602 is coupled to the metering module bus 116, thereby providing power to the load metering modules 106.
  • a controller and communications power supply 606 is also arranged to receive power from the mains power supply bus 122 via an isolating transformer 608.
  • communications power supply 606 provides power to the controller module 118, which in turn provides power to the communications modules 120, 120'.
  • the load metering modules 106 are in direct communication with the communications bus of the metering module bus 116.
  • the communications bus is in data communication with an opto-isolator 610 that facilitates communication between the load metering modules 106 and the controller and communications modules 118, 120, 120' while isolating the controller and communications modules 118, 120, 120' from the high voltage side of the electrical energy metering system 100.
  • the communications modules 120, 120' are arranged to facilitate PLC and, as such, are coupled to the mains power supply bus 122.
  • each communications module 120, 120' is coupled to the mains power supply bus 122 via respective isolating transformers 612.
  • the communications modules 120, 120' can be isolated from the mains power supply bus 122 by any appropriate means, and the components that are used to isolate the communications modules 120, 120' may be arranged in any appropriate location or incorporated in any appropriate module, such as the controller module 118. For other situations, or as desired, the communications modules 120, 120' may not be isolated.
  • the electrical energy metering system 100 has been described in the context of a single phase electrical power system, it will be appreciated that a corresponding electrical energy metering system can be applied to a three phase electrical power system. Further, the electrical energy metering system 100 can be used to meter energy usage of a plurality of apartments, offices, or the like. Using the example of a block of apartments, a single base unit 102 can be installed wherein each load circuit and its corresponding load metering module 106 is used to meter the energy usage of a respective apartment .

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  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
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  • Arrangements For Transmission Of Measured Signals (AREA)

Abstract

La présente invention concerne un système de mesure d'énergie comprenant une unité de base destinée à recevoir de manière amovible des unités de mesure d'énergie et d'autres unités fonctionnelles. Une pluralité d'unités de métrologie peut être fixée à l'unité de base. Les unités de métrologie peuvent mesurer différents circuits électriques. Par exemple, chaque unité de métrologie peut mesurer les circuits électriques d'une pluralité d'appartements d'un immeuble d'habitation. Les unités fonctionnelles peuvent fournir n'importe quelle fonction, telle qu'un contrôle et des communications, entre autres. Les unités fonctionnelles et les unités de métrologie peuvent être déconnectées et remplacées tandis que l'unité de base est en position.
PCT/AU2014/000571 2013-05-31 2014-06-02 Système de mesure intelligent de point limite WO2014190389A1 (fr)

Applications Claiming Priority (2)

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AU2013901964 2013-05-31
AU2013901964A AU2013901964A0 (en) 2013-05-31 Intelligent end point metering system

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WO2014190389A1 true WO2014190389A1 (fr) 2014-12-04

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150241480A1 (en) * 2012-09-28 2015-08-27 Schneider Electric USA, Inc. Power meter configured for rear and side expansion

Citations (1)

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Publication number Priority date Publication date Assignee Title
US20080284614A1 (en) * 2007-05-16 2008-11-20 Square D Company Modular power monitoring system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080284614A1 (en) * 2007-05-16 2008-11-20 Square D Company Modular power monitoring system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150241480A1 (en) * 2012-09-28 2015-08-27 Schneider Electric USA, Inc. Power meter configured for rear and side expansion
US9632112B2 (en) * 2012-09-28 2017-04-25 Schneider Electric USA, Inc. Power meter configured for rear and side expansion

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