DK152458B - STATIC ELECTRIC ELECTRIC MEASUREMENT FOR POWER AND ENERGY MEASURED FROM A POWER SUPPLY NETWORK - Google Patents
STATIC ELECTRIC ELECTRIC MEASUREMENT FOR POWER AND ENERGY MEASURED FROM A POWER SUPPLY NETWORK Download PDFInfo
- Publication number
- DK152458B DK152458B DK549484A DK549484A DK152458B DK 152458 B DK152458 B DK 152458B DK 549484 A DK549484 A DK 549484A DK 549484 A DK549484 A DK 549484A DK 152458 B DK152458 B DK 152458B
- Authority
- DK
- Denmark
- Prior art keywords
- power
- voltage
- converter
- supply network
- electric
- Prior art date
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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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Current Or Voltage (AREA)
Description
iin
DK 152458 BDK 152458 B
Opfindelsen angår et apparat af den i kravets indledning angivne art.The invention relates to an apparatus of the kind specified in the preamble of the claim.
Fra GB patentansøgning nr. 2 061 641 kendes et sådant apparat, som har til formål at bestemme spidseffekten for 5 hver af faserne i et trefasenet og ind- og udkoble forbrugere på hver af faserne således, at en forudbestemt maksimumsbelastning pr. fase ikke overskrides.GB patent application 2 061 641 discloses such an apparatus which aims to determine the peak power of each of the phases in a three-phase network and to enable and disable consumers on each of the phases so that a predetermined maximum load per phase is not exceeded.
Fra GB patentansøgning nr. 2 046 925 kendes et målesystem, der fungerer som en tilsatsenhed til en konven-10 tionel Ferrari-måler, hvilken enhed gør det muligt at registrere forbruget efter tre eller flere forskellige tariffer, så at forbruget kan prisdifferentieres alt efter, hvornår det finder sted.GB Patent Application No. 2,046,925 discloses a measuring system which acts as an additive to a conventional Ferrari meter, which unit can record consumption according to three or more different tariffs, so that consumption can be differentiated according to price, when it takes place.
Opfindelsen har til formål at angive et apparat af den 15 omhandléde art, som sikrer en korrekt måling af det faktiske forbrug, selv om der på de enkelte faser indkobles periodiske belastninger, og som er revisionsfri i den forstand, at den ikke i modsætning til den konventionelle Ferrari-måler kræver regelmæssige, grundige 20 serviceeftersyn og renovering af slidte komponenter samt justering.The invention has for its object to provide an apparatus of the kind in question which ensures a correct measurement of the actual consumption, although periodic loads are switched on at each stage and which is audit-free in the sense that it does not contradict it. conventional Ferrari gauges require regular, thorough 20 servicing and refurbishment of worn components as well as adjustment.
Dette formål opnås som angivet i kravets kendetegnende del ved, at aftastningsrækkefølgen af faserne er randomise-• ret, idet denne foranstaltning forhindrer, at man kan syn-25 kronisere en belastning, f.eks. et varmelegeme, med måleren og derved undgå, at det virkelige forbrug registreres.This object is achieved as stated in the characterizing part of the claim in that the sensing order of the phases is randomized, since this measure prevents the synchronization of a load, e.g. a heater, with the meter, thereby avoiding real consumption being recorded.
En udførelsesform for apparatet ifølge opfindelsen er skematisk vist på tegningen og skal beskrives nærmere i det følgende under henvisning dértil. 1 På tegningen er et strømforsyningsnet repræsenteret vedAn embodiment of the apparatus according to the invention is shown diagrammatically in the drawing and will be described in more detail below with reference thereto. 1 In the drawing, a power supply network is represented by
DK 152458 BDK 152458 B
2 tre faseledere R, S og T og en nulleder N. I hver fase-leder er indskudt et signalkonditioneringskredsløb henholdsvis 10, 11 og 12, som hvert især desuden er forbundet med ntillederen, og som afføler fasespændingerne over 5 ohmske spændingsdelere og fasestrømmene gennem måletrans-formere og omsætter disse størrelser til spændingssignaler med et for de efterfølgende kredsløb acceptabelt niveau. De således konditionerede signaler tilføres parvis en multiplexer 13, der overfører signalerne pr. fase tids-10 forskudt i forhold til hverandre til en multiplikator 14.2 have three phase conductors R, S and T and a zero conductor N. In each phase conductor is inserted a signal conditioning circuit 10, 11 and 12 respectively, each of which is additionally connected to the conductor, which senses the phase voltages over 5 ohmic voltage dividers and the phase currents through the measuring transducer. amplify and convert these magnitudes to voltage signals with a level acceptable for subsequent circuits. The signals thus conditioned are supplied in pairs to a multiplexer 13 which transmits the signals per second. phase time-10 offset relative to a multiplier 14.
I denne dannes produktet af strøm og spænding for hver fase. Disse produkter tilføres en i multiplikatoren 14 indeholdt RMS-omsætter, som afgiver en spænding, hvis størrelse er et udtryk for øjeblikseffekten i den pågæl-15 dende fase. Denne spænding tilføres en spænding/frekvens-omsætter 15, i det følgende kaldt en V/F-omsætter, hvis udgangssignal er et impulstog med en frekvens, der er proportional med det på indgangen påtrykte spændingssignal. Dette impulstog føres som indgangssignal til en 20 mikroprocessor 16, i hvilken der sker en optælling af antal impulser pr. sekund fra V/F-omsætteren. Dette antal er et udtryk for den øjeblikkelige effekt. Mikroprocessoren 16 multiplicerer effektudtrykket med en tidsfaktor, og resultatet af denne multiplikation er et udtryk for den for-25 brugte energimængde. Dette udtryk for den forbrugte energimængde lagres i lageret 18 og adderes her til tidligere beregnede forbrugte energimængder. Lageret 18 indeholder således det samlede registrerede forbrug.In it, the product is generated by current and voltage for each phase. These products are supplied with a RMS converter contained in the multiplier 14, which emits a voltage whose magnitude reflects the instantaneous power of the relevant phase. This voltage is applied to a voltage / frequency converter 15, hereinafter referred to as a V / F converter, whose output signal is an impulse train with a frequency proportional to the voltage signal applied to the input. This pulse train is fed as an input signal to a microprocessor 16, in which a count of pulses per count is made. second from the V / F converter. This number is an expression of the immediate effect. Microprocessor 16 multiplies the power expression by a time factor, and the result of this multiplication is an expression of the amount of energy used. This expression of the amount of energy consumed is stored in the storage 18 and is added here to previously calculated amounts of energy. Storage 18 thus contains the total recorded consumption.
Mikroprocessoren 16 styrer også over en adressebus 17 sig-30 naloverføringen fra signalkonditioneringskredsene 10, 11 og 12 til multiplexeren 13. Denne overføring foregår sekventielt med tilfældigt varierende rækkefølge og med en frekvens, der er uafhængig af netfrekvensen. Derved gøres det umuligt for en forbruger- at unddrage sig re-35 gistrering af forbruget ved at synkronisere tilslutning af belastningen til nettet med målesystemet.The microprocessor 16 also controls over a address bus 17 the signal transmission from the signal conditioning circuits 10, 11 and 12 to the multiplexer 13. This transmission is carried out sequentially in random order and at a frequency independent of the grid frequency. This makes it impossible for a consumer to avoid recording the consumption by synchronizing the connection of the load to the grid with the measuring system.
33
DK 152458BDK 152458B
Den sekventielle signaloverføring bevirker, at der sker en registrering af effektforbruget på alle tre faser.The sequential signal transmission causes the consumption of power to be recorded at all three stages.
Det totale energiforbrug beregnes som summen af forbruget på de enkelte faser.The total energy consumption is calculated as the sum of the consumption at each stage.
5 For at sikre, at en allerede, foretaget registrering af effektforbrug bevares, selv om der sker en afbrydelse af spændingsforsyningen, overføres disse data til et lager 18 med tilfældig adgang, hvilket lager er således indrettet, at de lagrede data opretholdes, selv om den 10 forsyningsspænding, det får tilført, svigter. Det lagrede energiforbrug kan aflæses ved aktivering af en kontakt 19, hvorved mikroprocessoren 16 får tilført en impuls og af denne bringes til at overføre det i lageret akkumulerede energiforbrug til en udlæseenhed 20, der modsvarer tælle-15 værket i en konventionel elforbrugsmåler.5 To ensure that a power consumption record already made, even if the power supply is interrupted, this data is transmitted to a random access storage 18, which storage is arranged so that the stored data is maintained even though it is maintained. 10 supply voltage, it gets supplied, fails. The stored energy consumption can be read by activating a contact 19, whereby the microprocessor 16 is supplied with a pulse and caused to transmit the accumulated energy consumption in the storage to a readout unit 20 which corresponds to the counter 15 in a conventional electricity consumption meter.
De i målesløjfen indgående analoge komponenter, dvs. multiplexeren 13, multiplikatoren 14 med dennes RMS-omsætter og V/F-omsætteren 15 er udsat for ældning og temperaturdrift, da elmålere ofte er anbragt i omgivelser, 20 hvor temperatur og luftfugtighed varierer stærkt. Det er derfor vigtigt at træffe foranstaltninger til at forhindre, at disse fænomener skal påvirke målenøjagtigheden. Til dette formål findes en referencespændingskilde 21, der er opbygget omkring en halvlederreferencediode med meget 25 lav temperaturdrift og stor langtidsstabilitet. Ved hjælp af denne spændingsreference foretages ved start af appara-tet og derefter med mellemrum, f.eks. på en halv time, en selvkalibrering af apparatet. Dette sker ved, at mikroprocessoren til multiplexeren 13 afgiver et styresignal, 30 som bevirker, at alle indgange til multiplexeren afbrydes, hvorefter signalet fra V/F-omsætteren 15 måles. Dette signal er da udtryk for systemets nulpunktsfejl. Mikroprocessoren afgiver nu til multiplexeren et nyt styresignal, der bevirker, at referencespændingskilden tilsluttes multi-The analog components included in the measuring loop, ie. the multiplexer 13, the multiplier 14 with its RMS converter, and the V / F converter 15 are subject to aging and temperature operation, since electricity meters are often placed in environments where temperature and humidity vary greatly. It is therefore important to take measures to prevent these phenomena from affecting measurement accuracy. For this purpose, there is a reference voltage source 21 which is built around a semiconductor reference diode with very low temperature operation and high long term stability. This voltage reference is made by starting the device and then at intervals, e.g. in half an hour, a self-calibration of the device. This is done by the microprocessor of the multiplexer 13 emitting a control signal 30 which causes all inputs to the multiplexer to be interrupted and the signal from the V / F converter 15 is measured. This signal then reflects the system's zero point error. The microprocessor now outputs to the multiplexer a new control signal which causes the reference voltage source to be connected to the multi-
Claims (1)
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DK549484A DK152458C (en) | 1984-11-20 | 1984-11-20 | STATIC ELECTRIC ELECTRIC MEASUREMENT FOR POWER AND ENERGY MEASURED FROM A POWER SUPPLY NETWORK |
PCT/DK1985/000107 WO1986003301A1 (en) | 1984-11-20 | 1985-11-19 | A static, electric apparatus for measuring power and energy drawn from a power supply network |
EP19850905786 EP0203947A1 (en) | 1984-11-20 | 1985-11-19 | A static, electric apparatus for measuring power and energy drawn from a power supply network |
AU50928/85A AU5092885A (en) | 1984-11-20 | 1985-11-19 | A static, electric apparatus for measuring power and energy drawn from a power supply network |
JP50519385A JPS62501445A (en) | 1984-11-20 | 1985-11-19 | Electrostatic device for measuring electrical energy usage in power supply networks |
DK75186A DK75186A (en) | 1984-11-20 | 1986-02-18 | STATIC ELECTRIC ELECTRIC MEASUREMENT FOR POWER AND ENERGY MEASURED FROM A POWER SUPPLY NETWORK |
FI862941A FI862941A (en) | 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 |
---|---|---|---|
DK549484A DK152458C (en) | 1984-11-20 | 1984-11-20 | STATIC ELECTRIC ELECTRIC MEASUREMENT FOR POWER AND ENERGY MEASURED FROM A POWER SUPPLY NETWORK |
DK549484 | 1984-11-20 |
Publications (4)
Publication Number | Publication Date |
---|---|
DK549484D0 DK549484D0 (en) | 1984-11-20 |
DK549484A DK549484A (en) | 1986-05-21 |
DK152458B true DK152458B (en) | 1988-02-29 |
DK152458C DK152458C (en) | 1988-07-25 |
Family
ID=8142915
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DK549484A DK152458C (en) | 1984-11-20 | 1984-11-20 | STATIC ELECTRIC ELECTRIC MEASUREMENT FOR POWER AND ENERGY MEASURED FROM A POWER SUPPLY NETWORK |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0203947A1 (en) |
JP (1) | JPS62501445A (en) |
AU (1) | AU5092885A (en) |
DK (1) | DK152458C (en) |
FI (1) | FI862941A (en) |
WO (1) | WO1986003301A1 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU5157490A (en) * | 1989-04-04 | 1990-11-05 | Alcatel Australia Limited | A sampling circuit |
WO1997021106A2 (en) * | 1995-12-05 | 1997-06-12 | Siemens Aktiengesellschaft | Electronic measurement device |
ES2132019B1 (en) * | 1997-03-17 | 2000-03-01 | Univ Sevilla | STATIC ELECTRIC ENERGY METER BASED ON RANDOM SIGNAL PROCESSING. |
CN100348984C (en) * | 2006-01-24 | 2007-11-14 | 北京万工科技有限公司 | Electric energy metrical pulse generation method for ammeter |
CN117907924B (en) * | 2024-01-24 | 2024-07-02 | 国网山西省电力公司阳泉供电公司 | Wide area metering device with self-calibration function and measurement method thereof |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4077061A (en) * | 1977-03-25 | 1978-02-28 | Westinghouse Electric Corporation | Digital processing and calculating AC electric energy metering system |
JPS54137649A (en) * | 1978-04-18 | 1979-10-25 | Tokyo Electric Power Co Inc:The | Digital protective relay device |
GB2040051B (en) * | 1979-01-11 | 1982-12-08 | South Eastern Elec Board | Electroni kolowatthour meter |
SU845109A1 (en) * | 1979-07-06 | 1981-07-07 | Львовский Ордена Ленина Политехническийинститут Им. Ленинского Комсомола | Active power-to-pulse quantity converter |
US4360879A (en) * | 1980-08-28 | 1982-11-23 | The Valeron Corporation | Power measuring device |
EP0101727B1 (en) * | 1982-02-25 | 1986-07-02 | Scientific Columbus, Inc. | Multi-function electricity metering method |
-
1984
- 1984-11-20 DK DK549484A patent/DK152458C/en not_active IP Right Cessation
-
1985
- 1985-11-19 EP EP19850905786 patent/EP0203947A1/en not_active Withdrawn
- 1985-11-19 WO PCT/DK1985/000107 patent/WO1986003301A1/en not_active Application Discontinuation
- 1985-11-19 AU AU50928/85A patent/AU5092885A/en not_active Abandoned
- 1985-11-19 JP JP50519385A patent/JPS62501445A/en active Pending
-
1986
- 1986-07-14 FI FI862941A patent/FI862941A/en not_active Application Discontinuation
Also Published As
Publication number | Publication date |
---|---|
DK549484D0 (en) | 1984-11-20 |
AU5092885A (en) | 1986-06-18 |
FI862941A0 (en) | 1986-07-14 |
JPS62501445A (en) | 1987-06-11 |
FI862941A (en) | 1986-07-14 |
DK549484A (en) | 1986-05-21 |
WO1986003301A1 (en) | 1986-06-05 |
DK152458C (en) | 1988-07-25 |
EP0203947A1 (en) | 1986-12-10 |
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PBP | Patent lapsed |