阅读说明：本技术 电能表仪表常数测试方法、设备、系统及介质 (Method, equipment, system and medium for testing constant of electric energy meter ) 是由 李建新 黄晓飞 李付周 李长松 郜军 杨光辉 于 2020-07-13 设计创作，主要内容包括：本发明提供了一种电能表仪表常数测试方法、设备、系统及介质,所述方法包括以下步骤：获取每个被检电能表的第一实时电能值；判断每个被检电能表的计度器末位是否进位；在某个被检电能表的计度器末位发生进位时,停止对应被检电能表的供电,以冻结对应被检电能表的脉冲累计状态；在所有被检电能表的计度器走齐完成后,恢复对每个被检电能表的供电；获取每个被检电能表的第二实时电能值,通过所述第二实时电能值判断对应被检电能表的累计电能值是否达到预设电能值等。本发明提供了一种基于优化计读脉冲法对被检电能表进行仪表常数测试的方法,能够大大简化规程中计读脉冲法进行电能表校核常数试验的控制难度,同时提高测试的合格率。(The invention provides a method, equipment, a system and a medium for testing the constant of an electric energy meter, wherein the method comprises the following steps: acquiring a first real-time electric energy value of each detected electric energy meter; judging whether the end bit of the counter of each detected electric energy meter carries out the carry or not; when the carry occurs at the end of the register of a certain detected electric energy meter, stopping the power supply of the corresponding detected electric energy meter so as to freeze the pulse accumulation state of the corresponding detected electric energy meter; after the counters of all the detected electric energy meters are completely moved, the power supply of each detected electric energy meter is restored; and acquiring a second real-time electric energy value of each detected electric energy meter, and judging whether the accumulated electric energy value of the corresponding detected electric energy meter reaches a preset electric energy value or not according to the second real-time electric energy value. The invention provides a method for testing the instrument constant of the detected electric energy meter based on an optimized metering and reading pulse method, which can greatly simplify the control difficulty of the electric energy meter checking constant test of the metering and reading pulse method in the regulations and simultaneously improve the qualification rate of the test.)

1. A method for testing the constant of an electric energy meter is characterized by comprising the following steps:

acquiring a first real-time electric energy value of each detected electric energy meter;

judging whether the end bit of the register of each detected electric energy meter carries out the carry on the basis of the first real-time electric energy value;

when the carry occurs at the end of the register of a certain detected electric energy meter, stopping the power supply of the corresponding detected electric energy meter so as to freeze the pulse accumulation state of the corresponding detected electric energy meter;

after the counters of all the detected electric energy meters are completely moved, the power supply of each detected electric energy meter is restored;

acquiring a second real-time electric energy value of each detected electric energy meter, and judging whether the accumulated electric energy value corresponding to the detected electric energy meter reaches a preset electric energy value or not according to the second real-time electric energy value; if the accumulated electric energy value of the detected electric energy meter reaches a preset electric energy value, adjusting the power factor of a current source of the detected electric energy meter to be a first power factor;

acquiring a third real-time electric energy value of each detected electric energy meter, and judging whether the end bit of the counter corresponding to the detected electric energy meter carries out carry again or not based on the third real-time electric energy value of each detected electric energy meter; if the carry of the end position of the register of the detected electric energy meter is detected to occur again, judging whether the third real-time electric energy value corresponding to the detected electric energy meter reaches the set electric energy value, and if the third real-time electric energy value corresponding to the detected electric energy meter reaches the set electric energy value, stopping the power supply of the corresponding detected electric energy meter;

calculating the total number of pulse signals output by the detected electric energy meter in the time period that the accumulated electric energy of the detected electric energy meter is increased from the preset electric energy value to the set electric energy value;

and judging whether the constant test of each detected electric energy meter is qualified or not according to the consistency of the total number of the pulse signals and the total number of the actually measured pulse signals of each detected electric energy meter.

2. The method for testing the meter constant of the electric energy meter according to claim 1, wherein the total number of the pulse signals output by the electric energy meter to be tested in the time period from the preset electric energy value to the set electric energy value is calculated by the following formula:

M=（X-P）×A

wherein M represents the total number of pulse signals output by the detected electric energy meter in a time period from a preset electric energy value to a set electric energy value, X represents the set electric energy value, P represents the electric energy value corresponding to the first carry generation of the last position of a counter of the detected electric energy meter, and A represents a rated meter constant of the detected electric energy meter.

3. The method for testing the constant of the electric energy meter according to claim 1, wherein before the first real-time electric energy value of the electric energy meter to be tested is obtained, the power factor of the current source of each electric energy meter to be tested is adjusted to be the first power factor, so that the corresponding electric energy meter to be tested outputs a pulse within the preset time A.

4. The method for testing the meter constants of the electric energy meter according to claim 1, wherein a standard electric energy meter is provided, and if the accumulated electric energy value of the standard electric energy meter reaches a preset electric energy value, the power factor of the current source of each of the electric energy meters to be tested is adjusted to the first power factor.

5. The electric energy meter constant testing method according to any one of claims 1 to 4, wherein the preset electric energy value is 0.9 times the set electric energy value.

6. The method of claim 5 wherein the first power factor is 0.125.

7. An electric energy meter constant test device, comprising:

the first acquisition module is used for acquiring a first real-time electric energy value of each detected electric energy meter;

the first judging module is used for judging whether the end bit of the counter of each detected electric energy meter carries out carry on the basis of the first real-time electric energy value; when the carry occurs at the end of the register of the electric energy meter to be detected, the first execution module is started;

the first execution module is used for stopping power supply of the corresponding electric energy meter to be detected when the carry occurs at the last position of a register of the electric energy meter to be detected so as to freeze the pulse accumulation state of the corresponding electric energy meter to be detected;

the system comprises a walking-level confirmation module, a power supply module and a power supply module, wherein the walking-level confirmation module is used for recovering the power supply of each detected electric energy meter after the counters of all the detected electric energy meters are completely walked;

the second acquisition module is used for acquiring a second real-time electric energy value of each detected electric energy meter;

the second judging module is used for judging whether the accumulated electric energy value corresponding to the detected electric energy meter reaches a preset electric energy value or not according to the second real-time electric energy value;

the second execution module is used for adjusting the power factor of the current source of the detected electric energy meter to be the first power factor when the accumulated electric energy value of the detected electric energy meter reaches the preset electric energy value;

the third acquisition module is used for acquiring a third real-time electric energy value of each detected electric energy meter;

the third judging module is used for judging whether the counter end bit corresponding to each detected electric energy meter carries out carry again or not based on the third real-time electric energy value of each detected electric energy meter;

the third execution module is used for judging whether the third real-time electric energy value corresponding to the detected electric energy meter reaches the set electric energy value or not when the carry is detected to occur again at the end position of the register of the detected electric energy meter, and stopping the power supply of the corresponding detected electric energy meter if the third real-time electric energy value corresponding to the detected electric energy meter reaches the set electric energy value;

the test output module is used for calculating the total number of pulse signals output by the detected electric energy meter in a time period when the accumulated electric energy of the detected electric energy meter is increased from the preset electric energy value to the set electric energy value; and judging whether the constant test of each detected electric energy meter is qualified or not according to the consistency of the total number of the pulse signals and the total number of the actually measured pulse signals of each detected electric energy meter.

8. The electric energy meter constant testing device according to claim 7, further comprising a preprocessing module, wherein the preprocessing module is configured to adjust the power factor of the current source of each detected electric energy meter to the first power factor before acquiring the first real-time electric energy value of the detected electric energy meter, so that the corresponding detected electric energy meter outputs a pulse within a preset time A.

9. An electric energy meter constant test system comprises an electric energy meter calibrating device and an upper computer, wherein the upper computer is in communication connection with a detected electric energy meter with a corresponding epitope of the electric energy meter calibrating device, and the electric energy meter constant test system is characterized in that when the instrument constant test is carried out on the detected electric energy meter, the upper computer executes the steps of the electric energy meter constant test method according to any one of claims 1 to 6.

10. A readable storage medium having instructions stored thereon, characterized in that: the instructions when executed by the processor implement the steps of the method of electrical energy meter constant testing according to any of claims 1-6.

Technical Field

The invention relates to the technical field of electric energy meter constant verification, in particular to a method, equipment, a system and a medium for testing an electric energy meter constant.

Background

The instrument constant refers to the relation between the test output of the electric energy meter and the electric energy change indicated by the display and is consistent with the constant of the nameplate mark. In the national grid enterprise standard 'single-phase intelligent electric energy meter technical specification Q/GDW 1364-charge 2013', the electric energy meter item 4.1.6 recommends a pulse constant for the electric energy meter according to different specifications:

recommendation constant of single-phase intelligent electric energy meter

In the national measurement and verification regulation of the people's republic of China "JJJG-2012 electronic alternating current electric energy meter", three test methods are specified for a meter constant test, namely a character-moving test method, a standard meter method and a metering and reading pulse method.

In the verification regulation of JJG-2012 electronic AC electric energy meter, the requirements for the character-moving test method in the instrument constant test are as follows: in a batch of tested electric energy meters with the same specification, two electric energy meters with stable errors (the error changes within 1/6 basic error limit during the test) and known constants are selected as reference meters. The current lines of the meters are connected in series and the voltage lines are connected in parallel, and under the conditions of reference voltage, maximum current and cos theta (sin theta) =1, when the last digit (irrelevant to decimal) of the counter is changed by not less than 15 (for 0.2S and 0.5 grade meters) or 10 (for 1 to 3 grade meters), the number (difference between values before and after electrifying) of the reference meter and other meters meets the requirement of a formula.

In the verification regulation of JJG-2012 electronic AC electric energy meter, the standard meter method in the meter constant test requires as follows: and for a batch of detected electric energy meters with the same mark, one standard electric energy meter can be used for checking the constant. Each detected meter is connected with the in-phase current line of the standard meter in series, the voltage lines are connected in parallel, and the operation is carried out for a period of time under the conditions of reference voltage, maximum current and cos theta (sin theta) = 1. After the operation is stopped, the error y (%) of each table to be detected is calculated according to a formula, and the y (%) is required not to exceed the basic error limit. Here, to operate the standard meter and the detected electric energy meter synchronously, the operation time is long enough so that the ratio (%) of the electric energy value represented by the last word (or the minimum cell) of the detected electric energy meter counter to the counted W' is not more than 1/10 of the grade index of the detected electric energy meter.

In the verification procedure of JJG-2012 electronic AC electric energy meter, the requirements for a metering and reading pulse method in a meter constant test are as follows: under the conditions of reference frequency, reference voltage, maximum current and cos theta (sin theta) =1, the last digit (irrelevant to decimal place) of the counter of the detected electric energy meter is changed by at least 1 digit, and the output pulse number N is in accordance with the requirement of formula (1), namely

N = bC ×10^-α（1）

In the formula: α represents the decimal place number of the counter, and α =0 in the absence of the decimal place; b represents the multiplying power of the counter, and is 1 when not marked; c represents the constant of the detected electric energy meter, imp/kWh (kvarh); if the unit of the indicated constant is different, it can be converted to table 13.

From the qualified judgment, the reading pulse method is equality judgment, the word-walking test method and the standard table method belong to inequality judgment, and the reading pulse method is more strict than the qualified judgment of the word-walking test method and the standard table method. Therefore, the meter reading pulse method is a relatively common method for testing the meter constant, and the metering department of the electric power company generally defaults to using the method for testing the meter constant.

When the instrument constant test is carried out by a metering pulse method, two modes are generally adopted: (1) all the epitope relays are controlled by upper computer software, so that the power supply of the electric energy meter is stopped when the tail carry of the register of the electric energy meter to be detected occurs, and the state of the electric energy meter is frozen; (2) the epitope relay is controlled by the epitope detection chip, and when the number of the metered pulses of the chip reaches a set value, the power supply of the electric energy meter is stopped, and the state of the electric energy meter is frozen. When the instrument constant test is carried out by a metering pulse method, the test termination condition is as follows: when the last digit (irrelevant to the decimal place) of the counter of the detected meter changes at least 1 digit, stopping the power supply of the electric energy meter to freeze the state of the electric energy meter; however, when the electric energy meter constants are verified by a metering and reading pulse method, particularly when the electric energy meter constants are verified in a large batch, the technical problems of long monitoring time and high control difficulty exist.

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 method, equipment, a system and a medium for testing the constant of an electric energy meter.

In order to achieve the purpose, the invention adopts the technical scheme that:

the invention provides a method for testing the constant of an electric energy meter, which comprises the following steps:

acquiring a first real-time electric energy value of each detected electric energy meter;

judging whether the end bit of the register of each detected electric energy meter carries out the carry on the basis of the first real-time electric energy value;

when the carry occurs at the end of the register of a certain detected electric energy meter, stopping the power supply of the corresponding detected electric energy meter so as to freeze the pulse accumulation state of the corresponding detected electric energy meter;

after the counters of all the detected electric energy meters are completely moved, the power supply of each detected electric energy meter is restored;

acquiring a second real-time electric energy value of each detected electric energy meter, and judging whether the accumulated electric energy value corresponding to the detected electric energy meter reaches a preset electric energy value or not according to the second real-time electric energy value; if the accumulated electric energy value of the detected electric energy meter reaches a preset electric energy value, adjusting the power factor of a current source of the detected electric energy meter to be a first power factor;

acquiring a third real-time electric energy value of each detected electric energy meter, and judging whether the end bit of the counter corresponding to the detected electric energy meter carries out carry again or not based on the third real-time electric energy value of each detected electric energy meter; if the carry of the end position of the register of the detected electric energy meter is detected to occur again, judging whether the third real-time electric energy value corresponding to the detected electric energy meter reaches the set electric energy value, and if the third real-time electric energy value corresponding to the detected electric energy meter reaches the set electric energy value, stopping the power supply of the corresponding detected electric energy meter;

calculating the total number of pulse signals output by the detected electric energy meter in the time period that the accumulated electric energy of the detected electric energy meter is increased from the preset electric energy value to the set electric energy value;

and judging whether the constant test of each detected electric energy meter is qualified or not according to the consistency of the total number of the pulse signals and the total number of the actually measured pulse signals of each detected electric energy meter.

The second aspect of the present invention provides an electric energy meter constant test apparatus, including:

the first acquisition module is used for acquiring a first real-time electric energy value of each detected electric energy meter;

the first judging module is used for judging whether the end bit of the counter of each detected electric energy meter carries out carry on the basis of the first real-time electric energy value; when the carry occurs at the end of the register of the electric energy meter to be detected, the first execution module is started;

the first execution module is used for stopping power supply of the corresponding electric energy meter to be detected when the carry occurs at the last position of a register of the electric energy meter to be detected so as to freeze the pulse accumulation state of the corresponding electric energy meter to be detected;

the system comprises a walking-level confirmation module, a power supply module and a power supply module, wherein the walking-level confirmation module is used for recovering the power supply of each detected electric energy meter after the counters of all the detected electric energy meters are completely walked;

the second acquisition module is used for acquiring a second real-time electric energy value of each detected electric energy meter;

the second judging module is used for judging whether the accumulated electric energy value corresponding to the detected electric energy meter reaches a preset electric energy value or not according to the second real-time electric energy value;

the second execution module is used for adjusting the power factor of the current source of the detected electric energy meter to be the first power factor when the accumulated electric energy value of the detected electric energy meter reaches the preset electric energy value;

the third acquisition module is used for acquiring a third real-time electric energy value of each detected electric energy meter;

the third judging module is used for judging whether the counter end bit corresponding to each detected electric energy meter carries out carry again or not based on the third real-time electric energy value of each detected electric energy meter;

the third execution module is used for judging whether the third real-time electric energy value corresponding to the detected electric energy meter reaches the set electric energy value or not when the carry is detected to occur again at the end position of the register of the detected electric energy meter, and stopping the power supply of the corresponding detected electric energy meter if the third real-time electric energy value corresponding to the detected electric energy meter reaches the set electric energy value;

the test output module is used for calculating the total number of pulse signals output by the detected electric energy meter in a time period when the accumulated electric energy of the detected electric energy meter is increased from the preset electric energy value to the set electric energy value; and judging whether the constant test of each detected electric energy meter is qualified or not according to the consistency of the total number of the pulse signals and the total number of the actually measured pulse signals of each detected electric energy meter.

The invention provides a system for testing the meter constant of an electric energy meter, which comprises an electric energy meter calibrating device and an upper computer, wherein the upper computer is in communication connection with the electric energy meter to be tested at the corresponding position of the electric energy meter calibrating device, and the upper computer executes the steps of the method for testing the meter constant of the electric energy meter when the meter constant of the electric energy meter to be tested is tested.

A fourth aspect of the present invention provides a readable storage medium having stored thereon instructions which, when executed by a processor, carry out the steps of the method for testing the constants of an electric energy meter as described above.

Compared with the prior art, the invention has prominent substantive characteristics and remarkable progress, particularly:

1) the invention provides a method, equipment, a system and a medium for testing the constant of an electric energy meter, which are used for making all the electric energy meters to be tested in a state that a register just finishes minimum carry at a preparation stage before the constant test of the electric energy meter begins; the tested electric energy meters after the completion of the alignment of the counters are subjected to instrument constant test, and all the tested electric energy meters complete the required change of the final carry of the counters in nearly the same time, so that the test control flow is simplified, the test time is shortened, and the working efficiency is improved;

2) the invention provides a method for testing the instrument constant of a to-be-tested electric energy meter based on an optimized metering and reading pulse method, which can greatly simplify the control difficulty of an electric energy meter checking constant test performed by a metering and reading pulse method according to the verification regulation of JJJG-2012 electronic alternating current electric energy meter and improve the qualification rate of the test.

Drawings

FIG. 1 is a control flow diagram of the preparation phase of the present invention.

FIG. 2 is a control flow chart of the end stage of a meter constant test performed by the meter-read pulse method of the present invention.

Detailed Description

The technical solution of the present invention is further described in detail by the following embodiments.