CN105572626B - The overproof methods of measurement and calculation of error produced by leakage field induced electromotive force - Google Patents
The overproof methods of measurement and calculation of error produced by leakage field induced electromotive force Download PDFInfo
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- CN105572626B CN105572626B CN201610095112.9A CN201610095112A CN105572626B CN 105572626 B CN105572626 B CN 105572626B CN 201610095112 A CN201610095112 A CN 201610095112A CN 105572626 B CN105572626 B CN 105572626B
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- sampling resistor
- electromotive force
- sampling
- overproof
- measurement
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- 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
Abstract
The invention discloses a kind of overproof methods of measurement and calculation of error produced by leakage field induced electromotive force, the first sampling resistor, the second sampling resistor, the 3rd sampling resistor, the 4th sampling resistor, the 5th sampling resistor, accordingly area S at the 6th sampling resistor are measuredA1、SA2、SB1、SB2、SC1、SC2；Power transformer input voltage, accordingly magnet steel intensity is measured with magnetic field intensity tester at the first sampling resistor, the second sampling resistor, the 3rd sampling resistor, the 4th sampling resistor, the 5th sampling resistor, the 6th sampling resistor respectively, is respectively B1、B2、B3、B4、B5、B6, obtain the interference electromotive force △ E that leakage field producesX=2 π f (Bx2Sx2‑Bx1Sx1‑Bx2Sx3), wherein X=A, B, C；Electromotive force is then disturbed in sampled signal EZIn shared ratio, obtain the first sampling resistor, the second sampling resistor, the 3rd sampling resistor, the 4th sampling resistor, the 5th sampling resistor, the overproof δ of error at the 6th sampling resistor.The measurement workload of this method is small and efficient.
Description
Technical field
The present invention relates to electric energy meter technical field, is especially a kind of leakage field induced electromotive force institute in the case of voltage change
Produce the overproof methods of measurement and calculation of error.
Background technology
It is that voltage becomes in the case where current value is constant that voltage, which changes,.In brief, electric current fixed voltage becomes.In electric energy meter
In, the leakage field that power transformer produces can form current sampling circuit interference, and cause current sampling circuit to produce induced electricity
Kinetic potential and occur metering on error.And since voltage change can also bring the change of power transformer magnetic flux leakage therewith, because
This application condition is difficult to measure.The difference of the interference signal of each electrical voltage point and the interference signal proportion of 1.0Un is
Error is overproof, that is, the difference of the interference signal proportion of 0.8Un, 0.9Un, 1.1Un, 1.15Un and 1.0Un.Existing skill
The overproof measuring method of art error is to hang the electric energy meter in vitro stage body (stage body is equipped with standard scale), then defeated
Enter corresponding voltage and current value, data are read finally by stage body.Operating personnel input computer simultaneously again according to these data
List, it is overproof then to obtain the error of current sampling circuit by calculating.Above-mentioned measuring method has the following disadvantages：Due to needing
Largely manually to participate in measuring and need office, laboratory to carry out fallback when measuring, therefore not only bring to staff more
Workload, and also relatively time-consuming in this operating process so that measurement efficiency is relatively low.
The content of the invention
The technical problem to be solved in the present invention is, there is provided it is a kind of to measure the small and efficient leakage field induced electromotive force of workload
The overproof methods of measurement and calculation of produced error.
The technical scheme is that, there is provided a kind of overproof measurement of error produced by leakage field induced electromotive force and calculating side
Method, current sampling circuit are equipped with the first sampling resistor and the second sampling resistor, B phase current streams that A phase currents flow in and out
Enter and the 5th sampling resistor and the 6th that the 3rd sampling resistor and the 4th sampling resistor, C phase currents that flow out flow in and out is adopted
Sample resistance；Set the sampled signal E of A, B, C three-phaseZFor fixed value；Comprise the following steps：
(1), the first sampling resistor, the second sampling resistor, the 3rd sampling resistor, the 4th sampling resistor, the 5th sampling are measured
Corresponding area S at resistance, the 6th sampling resistorA1、SA2、SB1、SB2、SC1、SC2；
(2), power transformer input voltage, with magnetic field intensity tester respectively in the first sampling resistor, the second sampling electricity
Corresponding magnetic field intensity is measured at resistance, the 3rd sampling resistor, the 4th sampling resistor, the 5th sampling resistor, the 6th sampling resistor, point
Wei not B1、B2、B3、B4、B5、B6, then leakage field produce interference electromotive force △ EX=2 π f (Bx2Sx2-Bx1Sx1-Bx2Sx3), wherein X=
A、B、C；
(3), interference electromotive force is obtained in sampled signal EZIn shared ratio be
Wherein, X=A, B, C；
(4), electrical voltage point 1.0Un is set, interference electromotive force is in sampled signal EZIn shared ratio be δx/0.05I/U、
δx/0.1I/U、δx/I/U、δx/Imax/U；So, under other electrical voltage points, interference electromotive force is in sampled signal EZIn shared ratio be
δx/0.05I/y、δx/0.1I/y、δx/I/y、δx/Imax/y；, wherein, y=0.8Un, 0.9Un, 1.1Un, 1.15Un；
(5), the first sampling resistor, the second sampling resistor, the 3rd sampling resistor, the 4th sampling resistor, the 5th sampling are obtained
Overproof δ=the δ of error at resistance, the 6th sampling resistorx/z/y-δx/z/U=
After above method, compared with prior art, the present invention haing the following advantages：
The overproof methods of measurement and calculation of error produced by leakage field induced electromotive force of the present invention only needs to measure several data
It can draw error is overproof.Therefore fallback is carried out without office, laboratory when its need manually participates in measurement and measures on a small quantity,
Therefore the workload of staff is not only reduced, and it is also more time saving and energy saving in this operating process so that measurement effect
Rate is higher.
Embodiment
With reference to specific embodiment, the invention will be further described.
The overproof methods of measurement and calculation of error produced by a kind of leakage field induced electromotive force of the present invention, on current sampling circuit
What the first sampling resistor and the second sampling resistor, the B phase currents flowed in and out equipped with A phase currents flowed in and out the 3rd adopts
The 5th sampling resistor and the 6th sampling resistor that sample resistance and the 4th sampling resistor, C phase currents flow in and out；Set A, B, C
The sampled signal E of three-phaseZFor fixed value, i.e. 0.05Is of the sampled signal E of A, B, C three-phase in the case where loading same voltage,
The value of 0.1I, I, Imax (current maxima) four current points is substantially coincident, therefore sets it in the present embodiment to fix
Value, then；Comprise the following steps：
(1), the first sampling resistor, the second sampling resistor, the 3rd sampling resistor, the 4th sampling resistor, the 5th sampling are measured
Corresponding area S at resistance, the 6th sampling resistorA1、SA2、SB1、SB2、SC1、SC2；
(2), power transformer input voltage, with magnetic field intensity tester respectively in the first sampling resistor, the second sampling electricity
Corresponding magnetic field intensity is measured at resistance, the 3rd sampling resistor, the 4th sampling resistor, the 5th sampling resistor, the 6th sampling resistor, point
Wei not B1、B2、B3、B4、B5、B6, then leakage field produce interference electromotive force △ EX=2 π f (Bx2Sx2-Bx1Sx1-Bx2Sx3), wherein X=
A、B、C；
(3), interference electromotive force is obtained in sampled signal EZIn shared ratio be
Wherein, X=A, B, C；
(4), electrical voltage point 1.0Un is set, interference electromotive force is in sampled signal EZIn shared ratio be δx/0.05I/U、
δx/0.1I/U、δx/I/U、δx/Imax/U；So, under other electrical voltage points, interference electromotive force is in sampled signal EZIn shared ratio be
δx/0.05I/y、δx/0.1I/y、δx/I/y、δx/Imax/y；, wherein, y=0.8Un, 0.9Un, 1.1Un, 1.15Un；
(5), the first sampling resistor, the second sampling resistor, the 3rd sampling resistor, the 4th sampling resistor, the 5th sampling are obtained
Overproof δ=the δ of error at resistance, the 6th sampling resistorx/z/y-δx/z/U=
Only highly preferred embodiment of the present invention is described above, but is not to be construed as limiting the scope of the invention.This
Invention is not limited only to above example, its concrete structure is allowed to vary.In every case in the protection model of independent claims of the present invention
It is within the scope of the present invention to enclose interior made various change.
Claims (1)
- A kind of 1. overproof methods of measurement and calculation of error produced by leakage field induced electromotive force, it is characterised in that：Current sample electricity Road is equipped with the 3rd that the first sampling resistor for flowing in and out of A phase currents and the second sampling resistor, B phase currents flow in and out The 5th sampling resistor and the 6th sampling resistor that sampling resistor and the 4th sampling resistor, C phase currents flow in and out；Setting A, B, The sampled signal E of C three-phasesZFor fixed value；Comprise the following steps：(1), measure the first sampling resistor, the second sampling resistor, the 3rd sampling resistor, the 4th sampling resistor, the 5th sampling resistor, Corresponding area S at 6th sampling resistorA1、SA2、SB1、SB2、SC1、SC2；(2), power transformer input voltage, with magnetic field intensity tester respectively in the first sampling resistor, the second sampling resistor, Three sampling resistors, the 4th sampling resistor, the 5th sampling resistor, measure corresponding magnetic field intensity at the 6th sampling resistor, is respectively B1、B2、B3、B4、B5、B6, then leakage field produce interference electromotive force △ EX=2 π f (Bx2Sx2-Bx1Sx1-Bx2Sx3), wherein X=A, B, C；(3), interference electromotive force is obtained in sampled signal EZIn shared ratio beWherein, X=A, B, C；(4), electrical voltage point 1.0Un is set, interference electromotive force is in sampled signal EZIn shared ratio be δx/0.05I/U、δx/0.1I/U、 δx/I/U、δx/Imax/U；So, under other electrical voltage points, interference electromotive force is in sampled signal EZIn shared ratio be δx/0.05I/y、 δx/0.1I/y、δx/I/y、δx/Imax/y；, wherein, y=0.8Un, 0.9Un, 1.1Un, 1.15Un；(5), obtain the first sampling resistor, the second sampling resistor, the 3rd sampling resistor, the 4th sampling resistor, the 5th sampling resistor, Error at 6th sampling resistor is overproof
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| CN201610095112.9A CN105572626B (en) | 2016-02-22 | 2016-02-22 | The overproof methods of measurement and calculation of error produced by leakage field induced electromotive force |
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| CN105572626B true CN105572626B (en) | 2018-05-15 |
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| CN106371044B (en) * | 2016-08-22 | 2018-11-16 | 卢庆港 | A kind of box house iron core work state monitoring method based on leakage field |
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| CN201277986Y (en) * | 2008-08-27 | 2009-07-22 | 宁波三星电气股份有限公司 | Single-phase electric energy meter |
| CN201514473U (en) * | 2009-08-26 | 2010-06-23 | 武汉国测科技股份有限公司 | Error positioning device of high-voltage electric power metering device |
| CN202133699U (en) * | 2011-07-14 | 2012-02-01 | 威胜集团有限公司 | Metal sampling resistor used for current measuring |
| CN102854347A (en) * | 2012-08-09 | 2013-01-02 | 俞敏 | Electric energy meter and current sampling device thereof |
| CN203838326U (en) * | 2014-01-15 | 2014-09-17 | 云南电力试验研究院（集团）有限公司电力研究院 | Portable electric energy metering terminal calibration instrument |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5167941B2 (en) * | 2008-05-13 | 2013-03-21 | ミツミ電機株式会社 | Power supply |
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2016
- 2016-02-22 CN CN201610095112.9A patent/CN105572626B/en active Active
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|---|---|---|---|---|
| CN201277986Y (en) * | 2008-08-27 | 2009-07-22 | 宁波三星电气股份有限公司 | Single-phase electric energy meter |
| CN201514473U (en) * | 2009-08-26 | 2010-06-23 | 武汉国测科技股份有限公司 | Error positioning device of high-voltage electric power metering device |
| CN202133699U (en) * | 2011-07-14 | 2012-02-01 | 威胜集团有限公司 | Metal sampling resistor used for current measuring |
| CN102854347A (en) * | 2012-08-09 | 2013-01-02 | 俞敏 | Electric energy meter and current sampling device thereof |
| CN203838326U (en) * | 2014-01-15 | 2014-09-17 | 云南电力试验研究院（集团）有限公司电力研究院 | Portable electric energy metering terminal calibration instrument |
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| 变压器漏磁对锰铜采样电能表计量误差影响的研究;徐晴 等;《电测与仪表》;20120831(第8期);第66-70页 * |
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