CN111413661B - Detection method for instrument constant test by adopting standard meter method - Google Patents
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- CN111413661B CN111413661B CN202010372389.8A CN202010372389A CN111413661B CN 111413661 B CN111413661 B CN 111413661B CN 202010372389 A CN202010372389 A CN 202010372389A CN 111413661 B CN111413661 B CN 111413661B
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Abstract
The invention provides a detection method for performing an instrument constant test by adopting a standard meter method, which comprises the steps of connecting a standard meter with a detected electric energy meter; applying the reference voltage of the detected electric energy meter to the standard meter, and reading the current forward active total electric energy of the detected electric energy meter as a starting electric energy value; applying the maximum current of the detected electric energy meter to the standard meter, setting the phase angle to be 0 degrees, and starting to perform a test after the power output of the standard meter is stable; accumulating the electric energy value of the standard meter, and adjusting the phase angle according to a preset phase-shifting angle when the accumulated electric energy value of the standard meter is in a preset range; continuously accumulating the electric energy value of the standard meter, and reading the current forward active total electric energy of the detected electric energy meter as a termination electric energy value when the accumulated electric energy value of the standard meter is not less than a preset standard travel threshold value; calculating the difference between the ending electric energy value and the starting electric energy value of the detected electric energy meter, and calculating the error gamma of the detected electric energy meter; if gamma does not exceed the basic error limit, the product is qualified, otherwise, the product is not qualified.
Description
Technical Field
The invention relates to a detection method for an instrument constant test, in particular to a detection method for an instrument constant test by adopting a standard meter method.
Background
The instrument constant test is a detection item required by the national metrological verification regulation JJJG 596-2012, and the test has three implementation methods, wherein the instrument constant test is the most commonly used detection method.
The test requires that the operation is carried out for a period of time under the conditions of reference voltage, maximum current and cos phi (sin phi) being 1, and the operation is stopped and then the operation is carried out according to the requirements
Calculating the error gamma of each detected electric energy meter by a formula, wherein the gamma is required not to exceed the basic error limit; wherein, γ 0: the determined system error of the standard table is that when the determined system error does not need to be corrected, gamma 0 is equal to 0; w': the difference between the indication value after the stop of the operation of each detected electric energy meter and the indication value before the start of the operation is in kWh unit; w: and (4) displaying the electric energy value of the standard electric energy meter (the electric energy value of the standard electric energy meter is shortened and is converted into kWh).
In the test detection, the accumulated electric energy value of the standard meter is usually used as a stopping condition, the accumulation of the electric energy value of the standard meter is stopped after the accumulated electric energy value of the standard meter reaches a set standard travel threshold value in a timing or quantitative mode, and then the error gamma of each detected electric energy meter is calculated, so that the conclusion of each detected electric energy meter is judged.
In practical applications, it is not easy to stop the accumulation of the standard electric energy value immediately when the accumulation of the standard electric energy value just reaches the set standard travel threshold. By taking a single-phase electric energy meter as an example, the data plate parameters of voltage 220V and current 5(60) A, according to the test requirement, the power of the standard meter is 13200W at the moment, under the condition, the accumulated electric energy value of the standard meter only needs 2.7 seconds when changing 0.01kWh, and in addition, other objective environment influences, such as command transmission time, standard meter voltage, slow rising and slow falling of current output and the like, cause the accumulated value of the electric energy value of the standard meter to often exceed a set standard travel threshold, so that the detection result of the meter constant test through the standard meter method is influenced, and the judgment of the test conclusion is inaccurate.
In order to solve the above problems, people are always seeking an ideal technical solution.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a detection method for performing an instrument constant test by adopting a standard meter method.
In order to achieve the purpose, the invention adopts the technical scheme that: a detection method for performing instrument constant test by adopting a standard meter method comprises the following steps:
step 1, connecting a voltage loop of a standard meter and a voltage loop of a detected electric energy meter in parallel, and connecting a current loop of the standard meter and a current loop of the detected electric energy meter in series;
step 2, applying the reference voltage of the detected electric energy meter to the standard meter, and reading the current positive active total electric energy of the detected electric energy meter as a starting electric energy value E1；
Step 3, applying the maximum current of the detected electric energy meter to the standard meter, and starting a test after the power output of the power of the standard meter is stable, wherein the phase angle between the current output and the voltage output of the standard meter is set to be 0 degree;
step 4, accumulating the electric energy value of the standard meter, and adjusting the phase angle of the voltage output and the current output of the standard meter to be a preset phase-shifting angle F when the accumulated electric energy value of the standard meter is in a preset range0；
And 5: continuously accumulating the electric energy value W of the standard meter, reducing the current output of the standard meter when the accumulated electric energy value of the standard meter is not less than the preset standard travel threshold value, and reading the current positive active total electric energy of the detected electric energy meter as a termination electric energy value E2；
Step 6: after the reading is finished, stopping the test, and calculating the difference W' E between the ending electric energy value and the starting electric energy value of the detected electric energy meter2-E1；
According to
Calculating the error gamma of the detected electric energy meter; if gamma is not more thanAnd if the basic error limit of the detected electric energy meter is qualified, otherwise, the detected electric energy meter is unqualified.
Based on the above, in step 4, the preset range is: 0<Presetting a standard travel threshold E0-cumulative electric energy value W of standard meter<Phase shift conditional electric energy threshold Ed；
Wherein the electric energy threshold E is in the phase-shifting conditiondThe calculation formula of (A) is as follows;
wherein, T1The constant value represents the advance time of the accumulated electric energy value of the standard meter during phase shifting, and the unit is s; p represents rated power of the detected electric energy meter, and the unit is W; n represents a coefficient: single-phase N ═ 1; when the three-phase four-wire is N-3; three-phase three-wire time
Based on the above, the phase shift angle F is preset in step 40The calculation formula of (2) is as follows:
wherein, T2Is a constant and represents the time in s for each 0.001kWh change in the standard meter power value; p represents rated power of the detected electric energy meter, and the unit is W; n represents a coefficient: single-phase N ═ 1; when the three-phase four-wire is N-3; three-phase three-wire time
And R represents 1/10 with the minimum scale of the electric energy value of the detected electric energy meter.
Compared with the prior art, the method has outstanding substantive characteristics and remarkable progress, and particularly, the method changes the current power value of the standard meter by adopting a phase shifting method, so that the percentile change of the accumulated value of the electric energy value of the standard meter is slowed down, the test can be stopped immediately when the accumulated electric energy value of the standard meter approaches the set standard travel threshold, the problem that the accumulation of the electric energy value of the standard meter cannot be stopped immediately when the electric energy value of the standard meter reaches the set standard travel threshold is effectively solved, the detection means of the test is more reliable, and the detection conclusion is more accurate.
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FIG. 1 is a schematic flow chart of the detection method of the present invention.
Fig. 2 is a schematic connection diagram of the standard meter and the electric energy meter to be tested according to the invention.
Detailed Description
The technical solution of the present invention is further described in detail by the following embodiments.
The invention provides a detection method for performing an instrument constant test by adopting a standard meter method, which comprises the following steps as shown in figure 1:
step 1, connecting a voltage loop of a standard meter and a voltage loop of a detected electric energy meter in parallel, and connecting a current loop of the standard meter and a current loop of the detected electric energy meter in series;
step 2, applying the reference voltage of the detected electric energy meter to the standard meter, and reading the current positive active total electric energy of the detected electric energy meter as a starting electric energy value E1；
Step 3, applying the maximum current of the detected electric energy meter to the standard meter, and starting a test after the power output of the standard meter is stable, wherein the phase angle between the current output and the voltage output of the standard meter is set to be 0 degree;
step 4, accumulating the electric energy value of the standard meter, and adjusting the phase angle of the voltage output and the current output of the standard meter to be a preset phase-shifting angle F when the accumulated electric energy value of the standard meter is in a preset range0；
Specifically, the preset range is as follows: 0<Presetting a standard travel threshold E0-cumulative electric energy value W of standard meter<Phase shift conditional electric energy threshold Ed；
Wherein the electric energy threshold E is in the phase-shifting conditiondThe calculation formula of (A) is as follows;
wherein, T1Is a constant value representing the lead time of the accumulated electric energy value of the standard meter during phase shift, with the unit of s, preferably T1Is 4 s; p represents rated power of the detected electric energy meter, and the unit is W; n represents a coefficient: single-phase N ═ 1; when the three-phase four-wire is N-3; three-phase three-wire time
Further, the preset phase shift angle F0The calculation formula of (2) is as follows:
wherein, T2Is a constant value representing the time in s, preferably T, per 0.001kWh of change in the standard electrical energy value2Is 2 s; p represents rated power of the detected electric energy meter, and the unit is W; n represents a coefficient: single-phase N ═ 1; when the three-phase four-wire is N-3; three-phase three-wire time
And R represents 1/10 with the minimum scale of the electric energy value of the detected electric energy meter.
It will be appreciated that the phase shift condition is the electrical energy threshold EdAnd said predetermined phase shift angle F0The method can be obtained before the test or in the test process; and the electric energy threshold value E under the phase shift conditiondAnd said predetermined phase shift angle F0No change occurred throughout the experiment;
and 5: continuously accumulating the electric energy value W of the standard meter, reducing the current output of the standard meter and the detected electric energy meter when the accumulated electric energy value of the standard meter is not less than the preset standard travel threshold value, and reading the current positive active total electric energy of the detected electric energy meter as a termination electric energy value E2；
Step 6: after the reading is finished, stopping the test, and calculating the difference W' E between the ending electric energy value and the starting electric energy value of the detected electric energy meter2-E1；
According to
Calculating the error gamma of the detected electric energy meter; if gamma does not exceed the basic error limit of the detected electric energy meter, the electric energy meter is qualified, otherwise, the electric energy meter is unqualified.
It should be noted that the number of the electric energy meters to be detected may be 1 or multiple; when the number of the detected electric energy meters is multiple, a voltage loop of the standard meter is connected with a voltage loop of the detected electric energy meter in parallel, and a current loop of the standard meter is connected with a current loop of the detected electric energy meter in series; when the number of the detected electric energy meters is multiple, as shown in fig. 2, the electric energy meters are a standard meter and two detected electric energy meters; the voltage loop of the standard meter and the voltage loop of each detected electric energy meter are in parallel connection, and the current loop of the standard meter and the current loop of each detected electric energy meter are in series connection.
For the public understanding, the single-phase electric energy meter described in the background art is still exemplified here: the nameplate parameter voltage is 220V, the current is 5(60) A, and according to the test requirement, the rated power P (UxI xcos phi) (220 x 60 x 1) of the electric energy meter to be tested is calculated according to the rated voltage and the rated current of the electric energy meter to be tested;
calculating the electric energy threshold value E under the phase-shifting condition according to the rated power of the detected electric energy meterdAnd phase shift phase angle F0；
Then, connecting a voltage loop of the standard meter with a voltage loop of the detected electric energy meter in parallel, and connecting a current loop of the standard meter with a current loop of the detected electric energy meter in series; applying the reference voltage of the detected electric energy meter to the standard meter, and reading the current positive active total electric energy of the detected electric energy meter as the initial electric energy value E1(ii) a To standard surfaceAdding the maximum current of the detected electric energy meter, and starting a test after the power output of the standard meter is stable, wherein the phase angle between the current output and the voltage output is set to be 0 degree;
accumulating the electric energy value W of the standard meter, wherein the standard travel threshold value in the embodiment is preferably 0.20kWh for the convenience of understanding; when the 0.20 kWh-standard meter accumulates the electric energy value W<When the integrated electric energy value of the standard meter is greater than 0.20-0.0147 kWh-0.1853 kWh, the phase of the standard meter is shifted by 82.18 degrees, so that the phase angle between the current output and the voltage output of the standard meter becomes 82.18 degrees; after the phase shift angle is set, the accumulated electric energy value of the standard meter is based on the original 0.1853kWh time, and every 1 second
Start increasing by 0.001kWh every 2 seconds; when the accumulated electric energy value W of the standard meter is not less than the preset standard travel threshold value of 0.20kWh, the current output of the standard meter and the detected electric energy meter is reduced, and the current positive active total electric energy of the detected electric energy meter is read as the initial electric energy value E2And after the reading is finished, stopping the test, and judging the conclusion of the detected electric energy meter according to the step 6.
The invention adopts the phase shift technology, and when the accumulated electric energy value of the standard meter reaches the phase shift condition by changing the current power value of the standard meter, the phase shift angle F is calculated according to the calculated phase shift angle0The current phase angle is changed so that the electric energy value changes slowly (increasing by 0.001kWh every 2 seconds), so that when the electric energy value of the accumulative standard meter reaches the standard travel threshold, the test control is stopped simply and easily without increasing any hardware cost. According to the phase-shifting technical scheme, the instrument constant test is detected by the conventional standard meter method, so that the detection result is more reliable, and the detection efficiency is improved.
Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present invention and not to limit the same; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the invention as defined by the appended claims.
Claims (3)
1. A detection method for performing instrument constant test by adopting a standard meter method is characterized by comprising the following steps:
step 1, connecting a voltage loop of a standard meter and a voltage loop of a detected electric energy meter in parallel, and connecting a current loop of the standard meter and a current loop of the detected electric energy meter in series;
step 2, applying the reference voltage of the detected electric energy meter to the standard meter, and reading the current positive active total electric energy of the detected electric energy meter as a starting electric energy value E1；
Step 3, applying the maximum current of the detected electric energy meter to the standard meter, and starting a test after the power output of the standard meter is stable, wherein the phase angle between the current output and the voltage output of the standard meter is set to be 0 degree;
step 4, accumulating the electric energy value of the standard meter, and adjusting the phase angle of the voltage output and the current output of the standard meter to be a preset phase-shifting angle F when the accumulated electric energy value of the standard meter is in a preset range0；
And 5: continuously accumulating the electric energy value W of the standard meter, reducing the current output of the standard meter when the accumulated electric energy value of the standard meter is not less than the preset standard travel threshold value, and reading the current positive active total electric energy of the detected electric energy meter as a termination electric energy value E2；
Step 6: after the reading is finished, stopping the test, and calculating the difference W' E between the ending electric energy value and the starting electric energy value of the detected electric energy meter2-E1；
According to
Calculating the error gamma of the detected electric energy meter; if gamma does not exceed the basic error limit of the detected electric energy meter, the electric energy meter is qualified, otherwise, the electric energy meter is unqualified;
in step 4, the preset range is as follows: 0<Presetting a standard travel threshold E0-cumulative electric energy value W of standard meter<Phase shift conditionElectric energy threshold value Ed；
Wherein the electric energy threshold E is in the phase-shifting conditiondThe calculation formula of (A) is as follows;
wherein, T1The constant value represents the advance time of the accumulated electric energy value of the standard meter during phase shifting, and the unit is s; p represents rated power of the detected electric energy meter, and the unit is W; n represents a coefficient: single-phase N ═ 1; when the three-phase four-wire is N-3; three-phase three-wire time
Presetting phase shift angle F0The calculation formula of (2) is as follows:
wherein, T2Is a constant and represents the time in s for each 0.001kWh change in the standard meter power value; p represents rated power of the detected electric energy meter, and the unit is W; n represents a coefficient: single-phase N ═ 1; when the three-phase four-wire is N-3; three-phase three-wire time
And R represents 1/10 with the minimum scale of the electric energy value of the detected electric energy meter.
2. The method for detecting a meter constant test according to claim 1, characterized in that: the T is1Is 4 s.
3. The method for detecting a meter constant test according to claim 1, characterized in that: the T is2Is 2 s.
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| CN111896909B (en) * | 2020-07-16 | 2023-07-25 | 河南省计量科学研究院 | Electric energy meter error correction method and device |
| CN112034412A (en) * | 2020-07-20 | 2020-12-04 | 中国电力科学研究院有限公司 | Intelligent electric energy meter misalignment analysis method and system based on intelligent isolating switch |
| CN113671436A (en) * | 2021-09-09 | 2021-11-19 | 国网上海市电力公司 | Wireless detection method and system for intelligent electric energy meter |
| CN114089266B (en) * | 2022-01-21 | 2022-05-20 | 杭州炬华科技股份有限公司 | Meter calibration method and system suitable for single-phase double-loop electric energy meter |
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