WO1986003301A1 - Appareil electrique statique de mesure de la comsommation de la puissance et de l'energie fournies par un reseau d'alimentation - Google Patents

Appareil electrique statique de mesure de la comsommation de la puissance et de l'energie fournies par un reseau d'alimentation Download PDF

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Publication number
WO1986003301A1
WO1986003301A1 PCT/DK1985/000107 DK8500107W WO8603301A1 WO 1986003301 A1 WO1986003301 A1 WO 1986003301A1 DK 8500107 W DK8500107 W DK 8500107W WO 8603301 A1 WO8603301 A1 WO 8603301A1
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WO
WIPO (PCT)
Prior art keywords
voltage
power
frequency
basis
network
Prior art date
Application number
PCT/DK1985/000107
Other languages
English (en)
Inventor
Kurt Serup
Jo^/rgen LAURITZEN
Frank Pedersen
Original Assignee
Tee A/S Total Electronic Enterprise
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 Tee A/S Total Electronic Enterprise filed Critical Tee A/S Total Electronic Enterprise
Publication of WO1986003301A1 publication Critical patent/WO1986003301A1/fr
Priority to NO862683A priority Critical patent/NO862683L/no
Priority to FI862941A priority patent/FI862941A/fi

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R21/00—Arrangements for measuring electric power or power factor
    • 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 invention concerns an apparatus of the type defined in the introductory portion of claim 1.
  • the GB Patent Application 2 061 641 discloses such an appa ⁇ ratus which serves to determine the peak power of each of the phases in a three-phase network and to switch in and out the consumers on each of the phases so that a predeter ⁇ mined maximum load per phase is not exeeded.
  • the GB Patent Application 2 046 925 discloses a metering system which serves as an additional unit for a conven ⁇ tional Ferrari meter, and this unit enables registration of the consumption according to three orMmore different tariffs so that different billing rates can be applied for different times of consumption.
  • the object of the invention is to provide an apparatus of the present type which ensures correct metering of the actual consumption, even if periodic loads are switched in on the individual phases, and which is convenient in the sense that, in contrast to the conventional Ferrari meter, it requires no regular and thorough service and maintenance, no repair or replacement of worn components and no adjustment.
  • the detecting frequency is in ⁇ dependent of the network frequency, and that the detection order of the phases is randomized, whereby these features prevent synchorization of a load, e.g. a heating element, with the meter to avoid registration of the actual con- sumption.
  • the apparatus may be designed for self-calibration, as stated in claim 2.
  • An expedient embodiment of the self-calibration means is sta- ted in claim 3.
  • a power supply network is represented by three phase conductors R, S and T and a neutral conductor N.
  • a signal conditioning circuit 10, 11 and 12 is inserted in each phase conductor, and each of these circuits more ⁇ over connects with the neutral conductor and senses the phase voltage through ohmic voltage dividers and the phase currents through measuring transformers and converts these quantities to voltage signals having an acceptable level for the subsequent circuits.
  • the signals thus conditioned are fed in pairs to a multiplexer 13 which transfers the signals per phase with time delay with respect to each other to a multiplier 14. This multiplier produces the pro ⁇ duct of current and voltage for each phase.
  • pro ⁇ ducts are fed to an RMS converter which is contained in the multiplier 14 and applies a voltage whose size is an expression of the instantaneous power in the phase concerned.
  • This voltage is fed to a voltage/frequency converter 15, called V/F converter in the following, whose output signal is a pulse train having a frequency which is pro ⁇ portional to the voltage signal applied to the input.
  • the pulse train is fed as an input signal to a microprocessor 16, in which the number of pulses per second from the V/F converter is counted. This count is an expression of the instantaneous power.
  • the microprocessor 16 multiplies the power expression with a time factor, and the result of this multiplication is an expression of the consumed amount of energy.
  • the micro ⁇ processor 16 also controls the signal transfer from the signal conditioning circuits 10, 11 and 12 to the multi ⁇ plexer 13 through an address bus 17. This transfer takes place sequentially in an arbitrarily varying order and with a frequency which is independent of the network frequency. This makes it impossible for a consumer to avoid registra- tion of the consumption by synchronized switching in of the load to the network with the metering system.
  • the sequential signal transfer causes registration of the power consumption on all three phases.
  • the total consump ⁇ tion of energy is calculated as the sum of the consumption of the individual phases.
  • a random access store 18 which is so de ⁇ signed as to maintain the stored data even in case of failure in its supply voltage.
  • the stored consumption of energy can be read by actuation of a switch 19, which causes a pulse to be fed to the microprocessor 16, which is caused by the pulse to transfer the energy consumption stored in the store to a read-out unit 20, which corre- sponds to the counter in a conventional electricity meter.
  • the analog components incorporated in the measuring loop i.e. the multiplexer 13, the multiplier 14 with its RMS converter and the V/F converter 15 are subject to ageing and temperature drift, since electricity meters are often placed in surroundings in which temperature and air humi ⁇ dity vary greatly. Accordingly, it is important to take measures to prevent these phenomena from affecting the metering accuracy.
  • a reference vol ⁇ tage source 21 is provided, said source being based on a semiconductor reference diode having a very low temperature drift and very great long-term stability.
  • the apparatus is self-calibrated by means of this voltage reference upon start of the apparatus and then at intervals of e.g. 30 minutes.
  • the microprocessor applies a control signal to the multiplexer 13, said signal causing all inputs to the multiplexer to be disconnected, and then the signal from the V/F converter 15 is measured.
  • This sig ⁇ nal is then an expression of the zeropointerror of the system.
  • the microprocessor now applies a new control signal to the multiplexer, said signal causing the reference vol ⁇ tage source to be connected to the multiplexer, and the signal from the V/F converter is measured again.
  • a reference power incor- porated in the store at the manufacture of the meter it is now possible to calculate the number of pulses from the V/F converter which correspond to e.g. 0.1 kilowatt hour, and this value is stored in the store IB.
  • This calibration procedure which relies on the accuracy of the reference voltage and the knowledge of the corre ⁇ sponding reference power, serves to currently and automati ⁇ cally recalibrate/adjust the electricity meter, so that ageing and temperature drift have no influence of the long- term accuracy of the metering system.

Abstract

Un compteur d'électricité statique comprend pour chaque phase un circuit de conditionnement de signaux (10, 11 et 12) qui détecte la tension et le courant transmet des impulsions de tension représentant ces quantités à un multiplexeur (13), d'où celles-ci sont transférées en série à travers un multiplicateur (14) jusqu'à un convertisseur de tension/fréquence (15) dont le signal de sortie est une série d'impulsions dont la fréquence est une expression de la consommation de puissance sur la phase détectée à n'importe quel moment. Cette série d'impulsions est transmise à un microprocesseur (16) qui compte les impulsions et calcule la consommation d'énergie sur la base d'un facteur temps incorporé et transfère le résultat du calcul à une mémoire à accés sélectif (18). Le microprocesseur commande également le transfert de signaux du multiplexeur, de sorte que la détection des phases se fait dans un ordre qui varie de façon arbitraire et à une fréquence indépendante de la fréquence du réseau. Cela empêche le consommateur d'éviter l'enregistrement de la consommation en connectant synchroniquement la charge au réseau avec le système de mesure. Afin d'éviter des mesures inexactes dues au vieillissement ou à la dérive thermique du composant du compteur d'électricité, le compteur se calibre/ajuste automatiquement sur la base d'une source précise de tension de référence ayant une stabilité à long terme et une dérive thermique très basse.
PCT/DK1985/000107 1984-11-20 1985-11-19 Appareil electrique statique de mesure de la comsommation de la puissance et de l'energie fournies par un reseau d'alimentation WO1986003301A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
NO862683A NO862683L (no) 1984-11-20 1986-07-02 Statisk, elektrisk apparat for maaling av effekt og energi tatt ut fra et stroemforsyningsnett.
FI862941A FI862941A (fi) 1984-11-20 1986-07-14 Statisk, elektrisk apparat foer maetningar av effekt och energi fraon ett eldistributionsnaet.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK5494/84 1984-11-20
DK549484A DK152458C (da) 1984-11-20 1984-11-20 Statisk, elektrisk apparat til maaling af effekt og energi aftaget fra et stroemforsyningsnet

Publications (1)

Publication Number Publication Date
WO1986003301A1 true WO1986003301A1 (fr) 1986-06-05

Family

ID=8142915

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DK1985/000107 WO1986003301A1 (fr) 1984-11-20 1985-11-19 Appareil electrique statique de mesure de la comsommation de la puissance et de l'energie fournies par un reseau d'alimentation

Country Status (6)

Country Link
EP (1) EP0203947A1 (fr)
JP (1) JPS62501445A (fr)
AU (1) AU5092885A (fr)
DK (1) DK152458C (fr)
FI (1) FI862941A (fr)
WO (1) WO1986003301A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1990012325A1 (fr) * 1989-04-04 1990-10-18 Standard Telephone And Cables Pty. Limited Circuit d'echantillonnage
WO1997021106A2 (fr) * 1995-12-05 1997-06-12 Siemens Aktiengesellschaft Dispostif de mesure electronique
ES2132019A1 (es) * 1997-03-17 1999-08-01 Univ Sevilla Contador estatico de energia electrica basado en el procedimiento de señales aleatorias.
CN100348984C (zh) * 2006-01-24 2007-11-14 北京万工科技有限公司 一种用于电表的电能计量脉冲的产生方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1578174A (en) * 1977-03-25 1980-11-05 Westinghouse Electric Corp Digital processing and calculating ac electric energy metering system
US4276605A (en) * 1978-04-18 1981-06-30 Tokyo Shibaura Denki Kabushiki Kaisha Method and apparatus for supervising a digital protective relaying system
SU845109A1 (ru) * 1979-07-06 1981-07-07 Львовский Ордена Ленина Политехническийинститут Им. Ленинского Комсомола Преобразователь активной мощностиВ КОличЕСТВО иМпульСОВ
GB2082785A (en) * 1980-08-28 1982-03-10 Valeron Corp Power measuring device
US4345311A (en) * 1979-01-11 1982-08-17 South Eastern Electricity Board Electronic kilowatt-hour meter for measuring electrical energy consumption
WO1983003011A1 (fr) * 1982-02-25 1983-09-01 Scientific Columbus Inc Transducteur compteur d'electricite a fonctions multiples

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1578174A (en) * 1977-03-25 1980-11-05 Westinghouse Electric Corp Digital processing and calculating ac electric energy metering system
US4276605A (en) * 1978-04-18 1981-06-30 Tokyo Shibaura Denki Kabushiki Kaisha Method and apparatus for supervising a digital protective relaying system
US4345311A (en) * 1979-01-11 1982-08-17 South Eastern Electricity Board Electronic kilowatt-hour meter for measuring electrical energy consumption
SU845109A1 (ru) * 1979-07-06 1981-07-07 Львовский Ордена Ленина Политехническийинститут Им. Ленинского Комсомола Преобразователь активной мощностиВ КОличЕСТВО иМпульСОВ
GB2082785A (en) * 1980-08-28 1982-03-10 Valeron Corp Power measuring device
WO1983003011A1 (fr) * 1982-02-25 1983-09-01 Scientific Columbus Inc Transducteur compteur d'electricite a fonctions multiples

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Derwent World Patents Index; AN E6597E/16 *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1990012325A1 (fr) * 1989-04-04 1990-10-18 Standard Telephone And Cables Pty. Limited Circuit d'echantillonnage
WO1997021106A2 (fr) * 1995-12-05 1997-06-12 Siemens Aktiengesellschaft Dispostif de mesure electronique
WO1997021106A3 (fr) * 1995-12-05 1997-08-07 Siemens Ag Dispostif de mesure electronique
US6084394A (en) * 1995-12-05 2000-07-04 Siemens Aktiengesellschaft Electronic measuring device using a correction factor to compensate for measuring errors
ES2132019A1 (es) * 1997-03-17 1999-08-01 Univ Sevilla Contador estatico de energia electrica basado en el procedimiento de señales aleatorias.
CN100348984C (zh) * 2006-01-24 2007-11-14 北京万工科技有限公司 一种用于电表的电能计量脉冲的产生方法

Also Published As

Publication number Publication date
DK152458B (da) 1988-02-29
FI862941A0 (fi) 1986-07-14
JPS62501445A (ja) 1987-06-11
EP0203947A1 (fr) 1986-12-10
DK152458C (da) 1988-07-25
DK549484D0 (da) 1984-11-20
DK549484A (da) 1986-05-21
AU5092885A (en) 1986-06-18
FI862941A (fi) 1986-07-14

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