IE46337B1 - Error correction in electrical meters - Google Patents
Error correction in electrical metersInfo
- Publication number
- IE46337B1 IE46337B1 IE370/78A IE37078A IE46337B1 IE 46337 B1 IE46337 B1 IE 46337B1 IE 370/78 A IE370/78 A IE 370/78A IE 37078 A IE37078 A IE 37078A IE 46337 B1 IE46337 B1 IE 46337B1
- Authority
- IE
- Ireland
- Prior art keywords
- meter
- zero
- correction values
- signals
- stored
- Prior art date
Links
- 238000005259 measurement Methods 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims description 10
- 101100328088 Cladosporium cladosporioides cla3 gene Proteins 0.000 claims 1
- 230000005540 biological transmission Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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
- G01R11/00—Electromechanical arrangements for measuring time integral of electric power or current, e.g. of consumption
- G01R11/02—Constructional details
- G01R11/17—Compensating for errors; Adjusting or regulating means therefor
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R21/00—Arrangements for measuring electric power or power factor
- G01R21/14—Compensating for temperature change
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/04—Testing or calibrating of apparatus covered by the other groups of this subclass of instruments for measuring time integral of power or current
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Testing Or Calibration Of Command Recording Devices (AREA)
- Electric Clocks (AREA)
- Indication And Recording Devices For Special Purposes And Tariff Metering Devices (AREA)
- Electromechanical Clocks (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
For this automatic correction, the inputs of the meter are switched to zero potential within short time intervals by an electronic change-over switch. During the subsequent measurement, deviations from the set point are detected and stored. Furthermore, the inputs of the meter are connected to one or a number of reference quantities within short time intervals and any deviations from the set point are detected and stored. When the power consumption is measured, the stored correction values are used for compensating for all zero-point and calibration errors.
Description
This invention relates to error correction in electrical meters.
Every measuring instrument for analog measurands can exhibit two major errors: a zero-point error and a calibration error. Other measuring errors are of a relatively minor nature as compared therewith.
According to one aspect of the present invention, there is provided a method of correcting automatically zero-point and calibration errors in an electrical meter, comprising applying to the meter at intervals a zero input signal and a reference input ^ignal, automatically computing and storing correction values representing any deviation between the actual measured value and the desired measured value of each of the zero and reference input signals, and automatically employing the stored correction values in subsequent measurements to correct for any zero-point and calibration errors.
According to another aspect of the present invention, there is provided an electrical meter comprising means for , applying to the meter at intervals a zero input signal and a reference input signal, means for computing and storing .correction values representing any deviation between the actual measured value and the desired measured value of each of the zero and reference input signals, and means for employing the stored correction values in subsequent measurements to correct for any zero point and calibration errors in the meter.
-246337
In an electronic, kilowatt hour meter which is one example of the indention, a zero potential signal and a reference quantity signal are applied at sufficient intervals of time to the voltage and current inputs of the meter.
The input of the meter, which processes analog input signals, is provided with a preferably electronic change-over switch, which first connects the input of the meter to the zero potential signal. The result of the actual measurement is checked, and if it differs from the desired zero value measurement, a .correction value is computed and stored, which cancels out the zero-point deviation. In the next step, the input is connected to the reference quantity signal. The result of the actual measurement is again tested to ascertain whether it agrees with the desired value and in the event of deviations, a correction value is again computed and stored, which cancels out the calibration error concerned. Thus, the stored correction values are employed in subsequent measurements of unknown quantities, to correct for any zeropoint or calibration error. The electronic change-over switch changes over between normal input signals to the meter and the zero and reference input signals, at preferably regular intervals.
The initial and end points of the transmission characteristic curve of the meter are fixed. Consequently, the only remaining error is the curvature or the non-linearity of the transmission curve.
-346337
The zero-point and calibration correction is automatically performed, not necessarily before each measurement, but only at sufficiently short intervals of time to compensate for any variations which may have meanwhile occurred in the components of the meter. In the practical performance of the zero-point and calibration correction, the correction quantities may be stored in analog form. In the case of measuring instruments which convert analog quantities into digital values, in which kilowatt-hour meters are also included, the correction may with advantage be carried out solely on a digital basis.
If desirqd, the meter may be arranged to receive a plurality of reference signals, instead of just one, and to compute and store respective correction values for each reference signal, which correction values are then employed in correcting for any calibration errors which may appear.
We have found that in an example of a meter in accordance with the invention, the method of automatic zeropoint and calibration correction can substantially eliminate effects of the ^tolerances and drift of all the component parts of the meter. Consequently, we have found it possible to reduce the expenditure of labour in the manufacture and testing of an electronic kilowatt-hour meter, substantially eliminating the aforesaid two errors over the whole lifetime of the instrument, and thereby enhancing the measuring accuracy of the meter.
Claims (10)
1. CLAIMS :1. A method of correcting automatically zero-point and calibration errors in an electrical meter, comprising applying to the meter at intervals a zero input signal and a reference input signal, automatically ccmputing and storing correction values representing any deviation between the actual measured value and the desired measured value of each of the zero and reference input signals,and automatically employing the stored correction values in subsequent measurements to correct for any zero-point and calibration errors.
2. A method according to claim 1, wherein the zero and reference input signals are applied to the meter by an electronic switch which Changes over between normal input ' signals to the meter and the zero and reference input signals.
3. A method according to cla3,m 1 or 2, wherein the meter is an electronic kilowatt-hour meter.
4. A method according to claim 1, 2 or 3, wherein the meter includes means for applying the zero and reference signals to the meter at regular intervals.
5. A method according to claim 1, 2 ,3 or 4, including applying a plurality of reference signals to the meter , -54633^ computing and storing respective correction values therefor, and employing the stored said respective correction values in correcting for any calibration errors.
6. , A method of correcting automatically zeru-point and 5 calibration errors in an electrical meter, the method being substantially as described herein.
7. An electrical'meter comprising means for applying to the meter at intervals a zero input signal and a reference input signal, means for computing and storing correction values
8. 10 representing any deviation between the actual measured value and the desired measured value of each of the zero and reference input signals, and means for employing the stored correction values in subsequent measurements to correct for any zero-point and calibration errors in the meter. • is 8. A meter according to claim 7, wherein the means for applying the zero and reference input signals to the meter comprises an electronic switch which changes over between normal input signals to the meter and the zero and reference input· signals. 2o θ· A meter according to claim 7 or 8, being an electronic kilowatt-hour meter. -646337 10. A meter according to claim 7, 8 or 9, wherein said intervals are regular intervals.
9. 11. A meter according to claim 7, S , 9 or 10, arranged to recoive a plurality of reference signals at said intervals. to compute and store respective correction values therefor, and to employ the stored said respective correction values in correcting for any calibration errors.
10. 12. An electrical meter substantially as described herein.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19772708075 DE2708075A1 (en) | 1977-02-22 | 1977-02-22 | PROCEDURE FOR ELECTRONIC KILOWATT-HOUR METERS |
Publications (2)
Publication Number | Publication Date |
---|---|
IE780370L IE780370L (en) | 1978-08-22 |
IE46337B1 true IE46337B1 (en) | 1983-05-04 |
Family
ID=6002091
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
IE370/78A IE46337B1 (en) | 1977-02-22 | 1978-02-21 | Error correction in electrical meters |
Country Status (10)
Country | Link |
---|---|
BE (1) | BE863499A (en) |
CH (1) | CH630179A5 (en) |
DE (1) | DE2708075A1 (en) |
DK (1) | DK65178A (en) |
FR (1) | FR2381317A1 (en) |
GB (1) | GB1563677A (en) |
IE (1) | IE46337B1 (en) |
IT (1) | IT1092871B (en) |
LU (1) | LU78836A1 (en) |
NL (1) | NL7714129A (en) |
Families Citing this family (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3048015C2 (en) * | 1979-12-21 | 1986-07-03 | Deutsche Zähler-Gesellschaft Nachf. A. Stepper & Co (GmbH & Co), 2000 Hamburg | Correction circuit for electricity and heat meters with electronic measuring mechanism |
CH673714A5 (en) * | 1985-05-02 | 1990-03-30 | Zellweger Uster Ag | |
EP0240102A3 (en) * | 1986-03-31 | 1988-07-27 | Robinton Products Inc. | Power meter having self-test function |
US4829239A (en) * | 1986-04-09 | 1989-05-09 | Muller & Weigert, Gmbh | Multimeter |
US4884021A (en) * | 1987-04-24 | 1989-11-28 | Transdata, Inc. | Digital power metering |
CA1290400C (en) * | 1987-04-24 | 1991-10-08 | Scott H. Hammond | Digital power metering |
FR2625323B1 (en) * | 1987-12-24 | 1990-06-15 | Electricite De France | INTERFACING DEVICE FOR THE CALIBRATION OF SINGLE-PHASE AND THREE-PHASE ELECTRICAL POWER METERS |
DE4334766A1 (en) * | 1993-10-12 | 1995-04-13 | Siemens Ag | Electronic measuring device |
ES2155218T3 (en) * | 1995-12-05 | 2001-05-01 | Siemens Ag | ELECTRONIC MEASUREMENT DEVICE. |
DE10361664B4 (en) | 2003-12-30 | 2009-08-13 | Austriamicrosystems Ag | Energy counter arrangement |
DE102004010707B4 (en) | 2004-03-04 | 2013-08-22 | Austriamicrosystems Ag | Energy meter arrangement and method for calibration |
US8756029B2 (en) | 2011-01-21 | 2014-06-17 | Schneider Electric USA, Inc. | Non-linearity calibration using an internal source in an intelligent electronic device |
CN103592616B (en) * | 2013-11-14 | 2016-05-04 | 江苏林洋能源股份有限公司 | One can the full-automatic concurrent type frog single-point of autonomous type modification method |
CN112816934A (en) * | 2021-03-01 | 2021-05-18 | 云南电网有限责任公司电力科学研究院 | Method and system for judging error self-monitoring accuracy and timeliness of electric energy meter |
CN113466778B (en) * | 2021-07-01 | 2022-03-08 | 深圳市先行电气技术有限公司 | Ammeter calibration method |
CN115951289A (en) * | 2023-02-20 | 2023-04-11 | 重庆云宸新能源科技有限公司 | Current sensor zero calibration system and method and electric automobile |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3667041A (en) * | 1969-12-04 | 1972-05-30 | Blh Electronics | Automatic zero circuitry for indicating devices |
US3934197A (en) * | 1973-12-03 | 1976-01-20 | Corning Glass Works | Automatic calibration system |
DE2553631B1 (en) * | 1975-11-28 | 1977-01-20 | Siemens Ag | Automatic gain compensation for measuring sets - uses transistor attenuators controlled by digital counter and reference source |
-
1977
- 1977-02-22 DE DE19772708075 patent/DE2708075A1/en not_active Ceased
- 1977-12-20 NL NL7714129A patent/NL7714129A/en not_active Application Discontinuation
-
1978
- 1978-01-09 LU LU78836A patent/LU78836A1/en unknown
- 1978-01-31 BE BE184773A patent/BE863499A/en unknown
- 1978-02-14 DK DK65178A patent/DK65178A/en not_active Application Discontinuation
- 1978-02-16 IT IT20270/78A patent/IT1092871B/en active
- 1978-02-16 CH CH168278A patent/CH630179A5/en not_active IP Right Cessation
- 1978-02-20 GB GB6718/78A patent/GB1563677A/en not_active Expired
- 1978-02-21 IE IE370/78A patent/IE46337B1/en unknown
- 1978-02-21 FR FR7804949A patent/FR2381317A1/en active Granted
Also Published As
Publication number | Publication date |
---|---|
FR2381317A1 (en) | 1978-09-15 |
IE780370L (en) | 1978-08-22 |
IT1092871B (en) | 1985-07-12 |
LU78836A1 (en) | 1978-06-09 |
DE2708075A1 (en) | 1978-08-24 |
CH630179A5 (en) | 1982-05-28 |
NL7714129A (en) | 1978-08-24 |
FR2381317B1 (en) | 1982-04-30 |
BE863499A (en) | 1978-05-16 |
IT7820270A0 (en) | 1978-02-16 |
DK65178A (en) | 1978-08-23 |
GB1563677A (en) | 1980-03-26 |
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