Classifications

• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
  • G01R21/00—Arrangements for measuring electric power or power factor
  • G01R21/06—Arrangements for measuring electric power or power factor by measuring current and voltage
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
  • G01R21/00—Arrangements for measuring electric power or power factor
  • G01R21/06—Arrangements for measuring electric power or power factor by measuring current and voltage
  • G01R21/07—Arrangements for measuring electric power or power factor by measuring current and voltage in circuits having distributed constants
• • 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

Definitions

• the present invention relates to a detailed measuring device for electrical consumption.
• the measurements of electrical consumption are carried out conventionally by means of power meters or energy meters which measure the voltages and currents of supply of the appliances, to deduce the values of power and energy consumed.
• the most common energy meters are those used for billing subscribers to the public distribution network. They are either electromechanical type - that is to say comprising a motor driving a graduated disc whose rotational speed is proportional to the active power consumed - or electronic.
• Energy meters are also needed to carry out detailed measurements, for example to know the consumption of each of the departures of an electrical distribution board, that is to say to know for example the power consumption of the various electrical appliances. a dwelling house, a building or tertiary premises. This is called under-counting.
• the sub-counts have heretofore been achieved by means of multiple conventional energy meters 1, each connected to a particular current 2 of the electrical switchboard, and each requiring electrical connections 3 dedicated to the voltage and current measurements of the switchgear. where it is connected.
• Such a measurement installation is represented in FIG. 1.
• Its major disadvantage is that it requires a large wiring for the voltages and towards the consumption calculation unit 4, long wiring to be put in place, and expensive.
• the current sensors are represented by circles to schematize the toroid of the sensor which surrounds the conductor wire to be measured, but is not in direct electrical contact with it.
• the voltages measured by the various energy meters, at the different feeders are often the same, because they are the voltages supplied by the single-phase, two- or three-phase electrical network.
• the measuring device described in this Japanese patent application includes analog wire links for measuring the intensities consumed on each start of the electrical panel, these measurements being then transmitted to a central collection of said measurements, which carries out a calculation the power consumed and the energy consumed by the starting wire, from the current measurements for each corresponding wire.
• a single line provides the voltage common to all measurement points, that is to say, all departures of the table.
• the device is designed for measuring a determined number of current sensors. This number can not exceed a few tens, otherwise the links to the current sensors become too long and difficult to implement.
• the technical problem underlying the present invention is to provide a device for measuring the power and energy consumption on the basis of an electrical panel, which is both very simple at the level of the wiring, and which makes it possible to to overcome the interference phenomena measures, due to the very presence of the electrical installation.
• the technical problem cited above finds a solution with the present invention, in the form of a device for the detailed measurement of the power and / or energy consumed through at least one start of an electrical panel comprising several outlets, and connected to a single-phase, two-phase or three-phase electrical network, said device comprising:
• each cable of the outlet being provided with a measurement sensor, characterized in that the wires of the current sensors of the beam connected to each start of the array, are grouped together and connected to at least one digital calculation module connected to the collection unit via a digital link common to all the calculation modules, said digital link allowing the transmission in real time phase voltage values measured from the collection center to the measurement modules, to allow the calculation by each of the power values and / or energy consumed on each corresponding start, from the values of current measured locally and voltage values received by the digital link.
• Digital link means a cable or any other means for transmitting digitized data between the two ends of said wire.
• the digital link also allows the transmission from each module to the central collection, calculated power and / or energy values consumed (s) on the corresponding departure.
• this digital link comprises a conventional metal bus wire of the type used in computers.
• this digital link comprises a bus wire consisting of one or more optical fibers enabling the transmission of measurement data in the form of digital, by light pulses.
• the digital link comprises a radio link, more specifically a modulated radio link.
• the collection center is further connected to means for remote transmission of the instantaneous measurements and the measurements recorded by each calculation module.
• the calculation modules do not only allow to calculate the power and / or energy on each start of the electrical panel, but also each module has a memory that allows it to store a number of values of power and / or energy calculated over the previous periods of time, and possibly to return them to the central collection in the form of numerical values.
• the transmission means comprise a GSM radio module.
• GSM radio module This allows an electrician with a GSM phone to retrieve data from the measuring device, without having to move to the place where this meter is installed. It can also immediately see the effect of starting an electrical device on the powers called by the different measured starts, while moving in the building.
• the transmission frequency of the measurements of the voltages from the collection unit (5) to each module (9) is greater than 4000 Hz, that is to say that more than 4.10 3 voltage samples of each measured phase are transmitted every second from the collection center to the calculation modules.
• These samples can advantageously be dated, thus allowing interpolation by the calculation modules, to synchronize the voltage and current measurements as well as possible.
• a fieldbus meeting the BOSCH CAN 1.2 standard performs these functions advantageously.
• the voltages measurements are transmitted by the collection center to the modules in the form of a set of digital data allowing the modules to reconstruct the initial voltage measurements.
• Figure 1 is a schematic view of a measuring device according to the prior art
• Figure 2 is a schematic of a measuring device according to the invention, comprising three calculation modules connected to three current starts of an electrical panel.
• FIG. 2 represents a device for the detailed measurement of the power and / or energy consumed through three feeders 2 of an electrical switchboard connected to a three-phase electrical network.
• This measuring device comprises:
• each current measuring wire 4 being connected to a particular cable 7 (three phases and one neutral) of said feed, and
• the current sensors connected to each start 2 of the board are grouped together and connected to digital calculation modules 9 connected to the collection unit via a metal bus wire 10 common to all the calculation modules.
• the bus wire allows the transmission, in digital format, that is to say as the data transmitted inside a computer - from the collection unit 5 to each measurement module 9, the values of the voltages measured, and the transmission, if any, from each module 9 to the central collection 5, the corresponding values of power and / or energy consumed (s) on the corresponding 2 departure, calculated by said module from the values current measured on said start and the voltage transmitted on the bus.
• the central collection unit 5 is equipped with a user interface allowing the configuration of the measurement system and in particular the select for each current sensor of each calculation module 9, the voltage measured by the central collection that will be used for the calculation of power and energy.
• the interface also allows real-time visualization of the power and energy calculations of all measured departures from the electrical distribution panel.
• the central collection 5 takes its power supply through one or more measured phase cables. It provides a low voltage supply and galvanically isolated from the main power grid to all modules 9 connected on the digital bus 10. In addition, as shown in Figure 2, the collection center 5 is connected to transmission means to distance measurements, which take the form of a module 11 of radiotelephone to the GSM standard.
• the current sensors used may consist of conventional intensity transformers, Hall effect sensors or Rogowski coils.
• They can advantageously be of the openable type in order to fit on the son-or cables-to be measured, without the need to disconnect the wires from the measured start.

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• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Remote Monitoring And Control Of Power-Distribution Networks (AREA)

Applications Claiming Priority (2)

Publications (1)

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ID=34947650

Family Applications (1)

Country Status (3)

Families Citing this family (4)

Family Cites Families (6)

• 2004
  • 2004-06-25 FR FR0407011A patent/FR2872291B1/fr not_active Expired - Fee Related
• 2005
  • 2005-06-06 WO PCT/FR2005/001371 patent/WO2006010802A1/fr not_active Application Discontinuation
  • 2005-06-06 EP EP05775249A patent/EP1776594A1/de not_active Withdrawn

Non-Patent Citations (1)

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