CN109655779B - Reading method, detection method, device and system for electric energy meter running electric quantity - Google Patents
Reading method, detection method, device and system for electric energy meter running electric quantity Download PDFInfo
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- CN109655779B CN109655779B CN201811644214.7A CN201811644214A CN109655779B CN 109655779 B CN109655779 B CN 109655779B CN 201811644214 A CN201811644214 A CN 201811644214A CN 109655779 B CN109655779 B CN 109655779B
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- 238000001514 detection method Methods 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 25
- 230000005611 electricity Effects 0.000 claims abstract description 9
- 230000000630 rising effect Effects 0.000 claims description 7
- 230000009286 beneficial effect Effects 0.000 description 4
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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 method, a device and a system for reading the running electricity quantity of an electric energy meter, which are used for accurately obtaining the running electricity quantity of the standard electric energy meter in standard detection running time by obtaining each meter constant and the corresponding pulse number of the standard electric energy meter in a current constant section and a non-constant section in the standard detection running time and by using each meter constant and the corresponding pulse number, solving the technical problems of inaccurate reading of the running electricity quantity of the standard electric energy meter and overlong running time in the prior art and providing the method, the device and the system for reading the running electricity quantity of the electric energy meter with accurate and short running time.
Description
Technical Field
The invention relates to the technical field of power supply of a power grid, in particular to a reading method, a detection method, a device and a system of the word-running electric quantity of an electric energy meter.
Background
The electric energy is applied to various fields in daily life and work of people and becomes an indispensable part for social development, people need the electric energy meter to measure the electricity consumption degree of the electric energy, and the electric energy meter in the prior art has the problems of large word-moving error and too long word-moving time.
In the prior art, when current is applied to a standard electric energy meter to detect the running accuracy of the detected electric energy meter, the running electric quantity generated by a plurality of different meter constants of the standard electric energy meter in a rising section and a falling section of the current is ignored, and in order to eliminate the influence, the detection result is more accurate, the running electric quantity of the standard electric energy meter is calculated by a long time of a current constant section, but the running time is too long, and the error caused by the fact that the running electric quantity generated by a plurality of different meter constants of the standard electric energy meter in the rising section and the falling section of the current is ignored cannot be completely eliminated. Therefore, how to solve the above problems becomes a technical problem which needs to be solved urgently.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, the invention aims to provide an accurate reading method of the out-of-word electricity quantity of the standard electric energy meter.
Therefore, the invention has a second purpose of providing an accurate electric energy meter word running precision detection method.
To this end, a third object of the present invention is to provide an accurate standard meter reading device of the amount of power of going.
Therefore, the fourth purpose of the invention is to provide an accurate and efficient detection system for the word-off precision of the electric energy meter.
The technical scheme adopted by the invention is as follows:
in a first aspect, the present invention provides a method for reading a standard electric energy meter running electric quantity, which includes the following steps:
s1, recording the meter constants and the corresponding pulse numbers of the meter constants of the standard electric energy meter in a current constant section and a current non-constant section;
and S2, calculating the word running electric quantity of the standard electric energy meter according to each meter constant and the pulse number corresponding to each meter constant.
Further, the current non-constant section includes a current rising section and a current falling section.
Furthermore, the standard electric energy meter has a meter constant C0 and a meter constant C1 in the current rising section, the number of pulses corresponding to the meter constant C0 is P0, and the number of pulses of the meter constant C1 is P1; the standard electric energy meter has a meter constant C2 in the current constant section, and the number of pulses corresponding to the meter constant C2 is P2; the standard electric energy meter has a meter constant C3 and a meter constant C4 in the current descending section, the number of pulses corresponding to the meter constant C3 is P3, and the number of pulses of the meter constant C4 is P4; the standard electric energy meter reading electric quantity W1 is:
in a second aspect, the invention provides a method for detecting the running accuracy of an electric energy meter, which is based on the method for reading the running electric quantity of the standard electric energy meter, and comprises the following steps:
SS1, respectively providing voltage for the detected electric energy meter and the standard electric energy meter, and reading the initial electric quantity of the detected electric energy meter;
SS2, respectively providing current for the detected electric energy meter and the standard electric energy meter, stopping providing current for the detected electric energy meter and the standard electric energy meter after standard detection running time, and recording the running electric quantity of the standard electric energy meter after the standard detection running time; and recording the termination electric quantity of the detected electric energy meter after the standard detection word-moving time.
And SS3, obtaining the running accuracy error of the detected electric energy meter through the running electric quantity of the standard electric energy meter, the ending electric quantity of the detected electric energy meter and the initial electric quantity of the detected electric energy meter.
Further, the time at which the current is supplied to the detected electric energy meter and the standard electric energy meter in step SS2 is after the constant voltage time point or the constant voltage time point at the instant when the detected electric energy meter and the standard electric energy meter are in the constant voltage state, respectively.
Further, step SS3 specifically includes: and subtracting the initial electric quantity of the detected electric energy meter from the termination electric quantity of the detected electric energy meter to obtain the running electric quantity of the detected electric energy meter, and comparing the running electric quantity of the detected electric energy meter with the running electric quantity of the standard electric energy meter to obtain the running precision error of the detected electric energy meter.
In a third aspect, the present invention provides a standard electric energy meter reading apparatus for reading out electric quantity by reading out a word, including:
the meter constant acquisition module is used for acquiring a meter constant of the standard electric energy meter in a current constant section and a meter constant of the standard electric energy meter in a current non-constant section;
the pulse counting module is used for acquiring the pulse number corresponding to each meter constant of the meter constant in the current constant section and the meter constant in the current non-constant section of the standard electric energy meter;
and the processor is used for receiving the meter constant of the standard electric energy meter in the current constant section and the meter constant of the current non-constant section and the pulse number corresponding to each meter constant of the standard electric energy meter in the current constant section and the meter constant of the current non-constant section, and then calculating the word running electric quantity of the standard electric energy meter.
In a fourth aspect, the invention provides a detection system for the running accuracy of an electric energy meter, which comprises a standard electric energy meter comprising the standard electric energy meter running electric quantity reading device, a detected electric energy meter and a processing module; the standard electric energy meter and the detected electric energy meter are connected with the same voltage and the same current within the standard detection word-moving time, the output end of the standard electric energy meter and the output end of the detected electric energy meter are respectively connected with the input end of the processing module, and the processing module outputs the detection result of the word-moving precision of the detected electric energy meter.
The invention has the beneficial effects that:
the invention discloses a detection method for the running accuracy of an electric energy meter, which can accurately obtain the running electric quantity of the standard electric energy meter in standard detection running time by obtaining each meter constant and the corresponding pulse number of the standard electric energy meter in a constant current section and a non-constant current section in the standard detection running time, solves the technical problems of inaccurate reading of the running electric quantity of the standard electric energy meter and overlong running time in the prior art, and provides an accurate reading method for the running electric quantity of the standard electric energy meter.
The second beneficial effect of the invention is that:
the invention discloses a detection method for the running accuracy of an electric energy meter, which obtains the running accuracy error of the detected electric energy meter by obtaining the accurate running electric quantity of a standard electric energy meter in the standard detection running time, the initial electric quantity of the detected electric energy meter before the standard detection running time and the termination electric quantity of the detected electric energy meter after the standard detection running time.
The third beneficial effect of the invention is that:
the invention discloses a reading device for the running electricity quantity of a standard electric energy meter, which is characterized in that a meter constant acquisition module is arranged to acquire each meter constant of the standard electric energy meter in each time period, a pulse counting module acquires the pulse number corresponding to each meter constant, and a processor outputs the accurate running electricity quantity of the standard electric energy meter after processing each acquired meter constant and the pulse number corresponding to the meter constant.
The fourth beneficial effect of the invention is that:
the invention discloses a detection system for the running accuracy of an electric energy meter, which obtains a detection result of the running accuracy of the detected electric energy meter by inputting the same voltage into a standard electric energy meter and the detected electric energy meter which comprise a standard electric energy meter running electric quantity reading device and accessing current in standard running time and comparing the running electric quantity of the standard electric energy meter and the change of the electric quantity of the detected electric energy meter in the standard running time through a processing module.
Drawings
FIG. 1 is a flowchart illustrating a method for reading a digital power of a standard electric energy meter according to an embodiment of the present invention;
FIG. 2 is a flowchart illustrating a method for detecting the accuracy of a power meter reading according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of the trend of the voltage and the current of a standard electric energy meter and a detected electric energy meter along with the time sequence in the detection method of the running accuracy of the electric energy meter in the invention;
FIG. 4 is a block diagram of a typical electric energy meter reading apparatus according to an embodiment of the present invention;
fig. 5 is a block diagram of a system for detecting the accuracy of the meter reading according to an embodiment of the present invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
As shown in fig. 1, the method for reading the standard electric energy meter reading out electric quantity includes the following steps:
s1, recording the meter constants and the corresponding pulse numbers of the meter constants of the standard electric energy meter in the current constant section and the current non-constant section;
and S2, calculating the running word electric quantity of the standard electric energy meter according to each meter constant and the pulse number corresponding to each meter constant.
The method has the advantages that the meter constants and the corresponding pulse numbers of the standard electric energy meter in the current constant section and the non-constant section within the standard detection word running time are obtained, the word running electric quantity of the standard electric energy meter within the standard detection word running time can be accurately obtained through the meter constants and the corresponding pulse numbers, the technical problems that the reading of the word running electric quantity of the standard electric energy meter is inaccurate and the word running time is too long in the prior art are solved, and the accurate reading method of the word running electric quantity of the standard electric energy meter is provided.
As shown in fig. 2, the method for detecting the accuracy of reading the power of the electric energy meter based on the standard power of the electric energy meter according to the present invention includes the following steps:
SS1, respectively providing voltage for the detected electric energy meter and the standard electric energy meter, and reading the initial electric quantity of the detected electric energy meter;
SS2, respectively supplying current to the detected electric energy meter and the standard electric energy meter, stopping supplying current to the detected electric energy meter and the standard electric energy meter after the standard detection running time, and recording the running electric quantity of the standard electric energy meter after the standard detection running time; and recording the ending electric quantity of the detected electric energy meter after the standard detection word-moving time.
And SS3, obtaining the running accuracy error of the detected electric energy meter through the running electric quantity of the standard electric energy meter, the ending electric quantity of the detected electric energy meter and the initial electric quantity of the detected electric energy meter.
The method for reading the running power of the standard electric energy meter is used for obtaining the accurate running power of the standard electric energy meter in the standard detection running time, the initial power of the detected electric energy meter before the standard detection running time and the termination power of the detected electric energy meter after the standard detection running time so as to obtain the running precision error of the detected electric energy meter, solves the technical problems that the running precision error of the detected electric energy meter in the prior art is inaccurate in measurement and the running time is too long, and provides the method for detecting the running precision of the electric energy meter, which is accurate and has short running time.
As shown in fig. 3, in this embodiment, when the same voltage is supplied to the standard electric energy meter and the electric energy meter to be tested, the voltage trends of the standard electric energy meter and the electric energy meter to be tested linearly increase at a stage T1, the voltage of the standard electric energy meter and the electric energy meter to be tested is in a constant voltage state within a period T2 after a time T1, the period T2 corresponds to the length of the standard running time, the same current is supplied to the standard electric energy meter and the electric energy meter to be tested after a time T1, and during the standard running time, the current has two cases, namely, a constant section and a non-constant section, and the current non-constant section includes a current rising section and a current falling section. Specifically, the current of both the standard electric energy meter and the current of the electric energy meter to be detected linearly increase within the time T3, the current of both the standard electric energy meter and the current of the electric energy meter to be detected are in a constant current state within the time T4, and the current of both the standard electric energy meter and the electric energy meter to be detected linearly decreases within the time T5. And supplying voltage to the standard electric energy meter and the detected electric energy meter, and supplying the same current to the standard electric energy meter and the detected electric energy meter at a constant voltage time point which is reached when the voltage is at a constant voltage, namely the T1 time is over.
In the period of T3, as the current linearly increases, the meter constants of the standard electric energy meter also change, and in the embodiment, two meter constants are assumed to appear, namely C0 and C1, and at the moment, the pulse number P0 when the meter constant is C0 and the pulse number P1 when the meter constant is C1 are recorded; in the time period of T4, because the current is in a constant current state, only one meter constant C2 exists corresponding to the standard electric energy meter, and the corresponding pulse number P2 is recorded when the meter constant is C2; in the period of T5, the current is in a linearly decreasing state, and the meter constants of the standard electric energy meter are also changed, and it is assumed in this embodiment that two meter constants are represented as C3 and C4, and at this time, the pulse number P3 when the meter constant is C3 and the pulse number P4 when the meter constant is C4 are recorded.
Calculating the word-going electric quantity of the standard electric energy meter according to the word-going electric quantity in the time periods of T3, T4 and T5:
then the standard electric energy meter has the following electric quantity:
when the same voltage is supplied to the standard electric energy meter and the detected electric energy meter, recording the initial electric quantity of the detected electric energy meter as W01, recording the ending electric quantity of the detected electric energy meter as W02 after the standard detection word-moving time, and recording the word-moving electric quantity of the detected electric energy meter as delta W, wherein the delta W is W02-W01. And comparing the running electric quantity W1 of the standard electric energy meter with the delta W in the standard detection running time, which is obtained by calculating the running electric quantity of the standard electric energy meter, to obtain the running precision error of the detected electric energy meter.
As shown in fig. 4, the device for reading the power of a standard electric energy meter according to the present invention includes:
the meter constant acquisition module is used for acquiring a meter constant of the standard electric energy meter in a current constant section and a meter constant of the standard electric energy meter in a current non-constant section;
the pulse counting module is used for acquiring the pulse number corresponding to each meter constant of the meter constant in the current constant section and the meter constant in the current non-constant section of the standard electric energy meter;
and the processor is used for receiving the meter constant of the standard electric energy meter in the current constant section and the meter constant of the current non-constant section and the pulse number corresponding to each meter constant of the standard electric energy meter in the current constant section and the meter constant of the current non-constant section, and then calculating the word running electric quantity of the standard electric energy meter.
The meter constant acquisition module is arranged to acquire the meter constant of the standard electric energy meter in the constant current section and each meter constant of the non-constant current section, the pulse counting module acquires the number of pulses corresponding to each meter constant, and the processor outputs the accurate digital electric quantity of the standard electric energy meter after processing each acquired meter constant and the number of pulses corresponding to the meter constant.
As shown in fig. 5, the system for detecting the running accuracy of the electric energy meter in the present invention includes a standard electric energy meter including the standard electric energy meter running electric quantity reading device, a detected electric energy meter, and a processing module; the standard electric energy meter and the detected electric energy meter are both connected with the same voltage and the same current within the standard detection word-crossing time, the output end of the standard electric energy meter and the output end of the detected electric energy meter are respectively connected with the input end of the processing module, and the processing module outputs the detection result of the word-crossing precision of the detected electric energy meter. The processing module is used for comparing the power consumption of the standard electric energy meter with the power consumption of the detected electric energy meter, namely, after comparing W1 with delta W, judging whether the power consumption is within a preset range, and outputting the values of W1 and delta W and the judgment result to the display module, wherein the display module can be an LCD display. The invention discloses a detection system for the running accuracy of an electric energy meter, which obtains a detection result of the running accuracy of the detected electric energy meter by inputting the same voltage into a standard electric energy meter and the detected electric energy meter which comprise a standard electric energy meter running electric quantity reading device and accessing current in standard running time and comparing the running electric quantity of the standard electric energy meter and the electric quantity of the detected electric energy meter in standard running time through a processing module.
While the preferred embodiments of the present invention have been illustrated and described, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. A method for reading the running electric quantity of a standard electric energy meter is characterized by comprising the following steps:
s1, recording the meter constants and the corresponding pulse numbers of the meter constants of the standard electric energy meter in a current constant section and a current non-constant section;
and S2, calculating the word running electric quantity of the standard electric energy meter according to each meter constant and the pulse number corresponding to each meter constant.
2. The method for reading the running power of the standard electric energy meter according to claim 1, wherein the current non-constant section comprises a current rising section and a current falling section.
3. The method for reading the running electricity of the standard electric energy meter according to claim 2, wherein the standard electric energy meter has a meter constant C0 and a meter constant C1 in the current rising section, the number of pulses corresponding to the meter constant C0 is P0, and the number of pulses corresponding to the meter constant C1 is P1; the standard electric energy meter has a meter constant C2 in the current constant section, and the number of pulses corresponding to the meter constant C2 is P2; the standard electric energy meter has a meter constant C3 and a meter constant C4 in the current descending section, the number of pulses corresponding to the meter constant C3 is P3, and the number of pulses of the meter constant C4 is P4; the standard electric energy meter reading electric quantity W1 is:
4. a method for detecting the accuracy of the running word of the electric energy meter, which is based on the method for reading the running word electric quantity of the standard electric energy meter according to any one of claims 1 to 3, and comprises the following steps:
SS1, respectively providing voltage for the detected electric energy meter and the standard electric energy meter, and reading the initial electric quantity of the detected electric energy meter;
SS2, respectively providing current for the detected electric energy meter and the standard electric energy meter, stopping providing current for the detected electric energy meter and the standard electric energy meter after standard detection running time, and recording the running electric quantity of the standard electric energy meter after the standard detection running time; recording the termination electric quantity of the detected electric energy meter after the standard detection word-moving time;
and SS3, obtaining the running accuracy error of the detected electric energy meter through the running electric quantity of the standard electric energy meter, the ending electric quantity of the detected electric energy meter and the initial electric quantity of the detected electric energy meter.
5. The method for detecting the accuracy of meter reading according to claim 4, wherein the time for supplying current to the detected meter and the standard meter in step SS2 is after the constant voltage time point or the constant voltage time point at the moment when the detected meter and the standard meter are in the constant voltage state.
6. The method for detecting the running accuracy of the electric energy meter according to claim 4 or 5, wherein the step SS3 is specifically as follows: and subtracting the initial electric quantity of the detected electric energy meter from the termination electric quantity of the detected electric energy meter to obtain the running electric quantity of the detected electric energy meter, and comparing the running electric quantity of the detected electric energy meter with the running electric quantity of the standard electric energy meter to obtain the running precision error of the detected electric energy meter.
7. A standard electric energy meter reading device of electric quantity of going word, characterized by, includes:
the meter constant acquisition module is used for acquiring a meter constant of the standard electric energy meter in a current constant section and a meter constant of the standard electric energy meter in a current non-constant section;
the pulse counting module is used for acquiring the pulse number corresponding to each meter constant of the meter constant in the current constant section and the meter constant in the current non-constant section of the standard electric energy meter;
and the processor is used for receiving the meter constant of the standard electric energy meter in the current constant section and the meter constant of the current non-constant section and the pulse number corresponding to each meter constant of the standard electric energy meter in the current constant section and the meter constant of the current non-constant section, and then calculating the word running electric quantity of the standard electric energy meter.
8. A detection system for the running accuracy of an electric energy meter is characterized by comprising a standard electric energy meter, a detected electric energy meter and a processing module, wherein the standard electric energy meter comprises the standard electric energy meter running electric quantity reading device according to claim 7; the standard electric energy meter and the detected electric energy meter are connected with the same voltage and the same current within the standard detection word-moving time, the output end of the standard electric energy meter and the output end of the detected electric energy meter are respectively connected with the input end of the processing module, and the processing module outputs the detection result of the word-moving precision of the detected electric energy meter.
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| CN201811644214.7A CN109655779B (en) | 2018-12-29 | 2018-12-29 | Reading method, detection method, device and system for electric energy meter running electric quantity |
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| CN201811644214.7A CN109655779B (en) | 2018-12-29 | 2018-12-29 | Reading method, detection method, device and system for electric energy meter running electric quantity |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101770007A (en) * | 2008-12-31 | 2010-07-07 | 深圳市科陆电子科技股份有限公司 | Electric energy meter test system and method thereof |
| WO2014027318A4 (en) * | 2012-08-17 | 2014-04-17 | Reliance Infrastructure Ltd. | Meter testing device |
| CN105911512A (en) * | 2016-06-06 | 2016-08-31 | 国家电网公司 | Intelligent electric energy meter constant test system and test method thereof |
| CN107607902A (en) * | 2017-07-26 | 2018-01-19 | 国网天津市电力公司电力科学研究院 | A kind of computational methods of test process Plays electric energy meter meter constant |
-
2018
- 2018-12-29 CN CN201811644214.7A patent/CN109655779B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101770007A (en) * | 2008-12-31 | 2010-07-07 | 深圳市科陆电子科技股份有限公司 | Electric energy meter test system and method thereof |
| WO2014027318A4 (en) * | 2012-08-17 | 2014-04-17 | Reliance Infrastructure Ltd. | Meter testing device |
| CN105911512A (en) * | 2016-06-06 | 2016-08-31 | 国家电网公司 | Intelligent electric energy meter constant test system and test method thereof |
| CN107607902A (en) * | 2017-07-26 | 2018-01-19 | 国网天津市电力公司电力科学研究院 | A kind of computational methods of test process Plays electric energy meter meter constant |
Non-Patent Citations (2)
| Title |
|---|
| 大规模集中检定电能表仪表常数测量方法的分析与探讨;苏慧玲 等;《电测与仪表》;20150818;第52卷(第16A期);第31页第2节第32页第3节，表1以及图1 * |
| 标准电能表基本误差测试过程中常见问题的探讨;刘景姝;《安徽电力》;20070630;第24卷(第2期);34-36 * |
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