CN112731264B - Electric energy meter testing method and device - Google Patents
Electric energy meter testing method and device Download PDFInfo
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- CN112731264B CN112731264B CN202011603692.0A CN202011603692A CN112731264B CN 112731264 B CN112731264 B CN 112731264B CN 202011603692 A CN202011603692 A CN 202011603692A CN 112731264 B CN112731264 B CN 112731264B
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Abstract
The invention provides an electric energy meter testing method, which comprises the following steps: s1: starting a test, and recording the active total electric quantity background of the MCU during starting; s2: acquiring the active total electric quantity background of the electric energy meter to be detected and the active total electric quantity of the MCU in real time; s3: judging whether the bottom degree of the active total electric quantity of the current electric energy meter to be tested generates first jumping or not; if yes, executing step S4; if not, returning to the step S2; s4: calculating the active total electric quantity background of the electric energy meter to be measured at the starting moment; s5: acquiring the active total electric quantity background of the electric energy meter to be detected and the active total electric quantity background of the MCU after the first jumping in real time; s6: judging whether the bottom degree of the active total electric quantity of the current electric energy meter to be tested generates second jumping or not; if yes, executing step S7; if not, executing the step S5; s7: and calculating the error of the electric energy meter to be measured. The invention also provides a testing device of the electric energy meter. The invention provides a method and a device for testing an electric energy meter, which solve the problem of long time consumption in the current process of testing the electric energy meter.
Description
Technical Field
The invention relates to the technical field of ammeter test, in particular to an ammeter test method and device.
Background
The problem of errors of the electric energy meter has long been a main reason for disputes between power users and power supply departments. The electric energy meter test is one of the methods for detecting the errors of the electric energy meter. However, in the current electric energy meter test, the voltage and the current of a standard source need to be firstly input into the electric energy meter, and then the word-moving electric quantity of the electric energy meter is obtained to be compared with the data of the standard source and the error of the electric energy meter is obtained after judgment. And standard sources cannot be provided for electric energy meter testing in the field environment. Therefore, when the electric energy meter test is needed, the power supply department needs to disassemble the electric energy meter on site first, and then sends the electric energy meter to a laboratory to test the electric energy meter, so that the electric energy meter test is long in time and low in efficiency when passing Cheng Hao.
In the prior art, for example, chinese patent disclosed on 15/01/2014, CN101770007a, sets a standard meter with specification parameters consistent with those of an electric energy meter to be tested in a word-moving source, so that a word-moving test can be performed while performing an aging test, which greatly saves time, but is only suitable for an electric energy meter which is just produced and is not suitable for an electric energy meter application site.
Disclosure of Invention
The invention provides a method and a device for testing an electric energy meter, which aim to overcome the technical defect of long time consumption in the process of testing the electric energy meter at present.
In order to solve the technical problems, the technical scheme of the invention is as follows:
an electric energy meter testing method comprises the following steps:
s1: starting a test, and recording the active total electric quantity background of the MCU during starting;
s2: acquiring the active total electric quantity background of the electric energy meter to be detected and the active total electric quantity of the MCU in real time;
s3: judging whether the bottom degree of the active total electric quantity of the current electric energy meter to be tested generates first jumping or not;
if yes, executing step S4; if not, returning to the step S2;
s4: recording the bottom degree of the active total electric quantity of the electric energy meter to be detected and the bottom degree of the active total electric quantity of the MCU during the first jump, and calculating the bottom degree of the active total electric quantity of the electric energy meter to be detected at the starting moment;
s5: acquiring the active total electric quantity background of the electric energy meter to be detected and the active total electric quantity background of the MCU after the first jump in real time;
s6: judging whether the active total electric quantity background of the current electric energy meter to be tested generates second jumping or not;
if yes, executing step S7; if not, executing the step S5;
s7: and calculating the error of the electric energy meter to be tested to finish the test of the electric energy meter.
According to the scheme, the errors of the electric energy meter to be tested are obtained through calculation by obtaining the active total electric quantity background of the electric energy meter to be tested and the active total electric quantity background of the MCU between two jumping, the electric energy meter test is completed without additional standard power supply, the electric energy meter to be tested is not required to be disassembled on site by a power supply department, and then the electric energy meter to be tested is sent to a laboratory for a word walking test, so that the test flow is simplified to a great extent, and the test time is shortened.
Preferably, in step S1, before starting the test, establishing a communication connection between the MCU and the electric energy meter to be tested is further included, specifically:
s1.1: the MCU builds a communication command frame and sends the communication command frame to the electric energy meter to be tested;
s1.2: judging whether the electric energy meter to be tested successfully receives the communication command frame within the set time and responding;
if so, successfully establishing communication connection between the MCU and the electric energy meter to be tested;
if not, the MCU changes the communication baud rate and the parity check bit and returns to the step S1.1.
Preferably, in step S2, the active total power of the MCU is obtained through the following steps:
s2.1: collecting the voltage and the current of the electric energy meter to be measured at a fixed frequency to obtain a current discrete signal I (t) and a voltage discrete signal U (t);
s2.2: and (3) obtaining instantaneous active power P by integrating I (t) and U (t), wherein the calculation formula is as follows:
wherein T is time and T is total time;
s2.3: the method comprises the following steps of carrying out continuous time integration on instantaneous active power to obtain the active total electric quantity E of the electric energy meter to be measured in a corresponding time period, wherein the calculation formula is as follows:
wherein, P (t) is the instantaneous active power at the moment t.
Preferably, in step S2.1, the fixed frequency is in the range of 40KHZ to 60KHZ.
Preferably, in step S2.1, the voltage and current of the electric energy meter to be measured are collected at a frequency of 50 KHZ.
Preferably, the active total electric quantity background of the electric energy meter to be tested is obtained by the communication between the MCU and the electric energy meter to be tested.
Preferably, in step S4, the active total electric quantity bottom E of the electric energy meter to be measured at startup is calculated by the following formula S0 ：
E S0 ＝E S -(E M -E M0 )
Wherein E is S The first jump is the active total electric quantity bottom degree, E of the electric energy meter to be measured M Is the active total electric quantity bottom degree, E, of the MCU at the first jump M0 The active total electric quantity of the MCU is at the bottom of the start.
Preferably, in step S7, the error Err of the electric energy meter to be measured is calculated by the following formula:
E ΔM ＝E M1 -E M0
E ΔS ＝E S1 -E S0
wherein E is ΔM Electric quantity for running word of MCU, E M1 The bottom of the active total electric quantity of the MCU at the second jump, E M0 For the active total electric quantity of the MCU at the time of starting, E ΔS For the running power of the electric energy meter to be measured, E S1 The bottom degree of the active total electric quantity of the electric energy meter to be measured during the second jump, E S0 The active total electric quantity of the electric energy meter to be tested is the active total electric quantity background during starting.
An electric energy meter testing device is applied to realize the electric energy meter testing method and comprises an electric energy meter to be tested, an electric energy meter and an MCU; the electric energy meter is used for carrying out A/D acquisition on a voltage signal and a current signal of the electric energy meter to be measured, obtaining the active total electric quantity in a corresponding time period through differential-integral operation, and obtaining the forward active word-walking electric quantity of the MCU after accumulating the active total electric quantity in the corresponding time period obtained through the differential-integral operation of the electric energy meter by using an electric energy accumulation timer in the MCU; the MCU is used for communicating with the electric energy meter to be tested to obtain the active total electric quantity of the electric energy meter to be tested; the electric energy meter to be tested is respectively connected with the electric energy meter and the MCU, and the electric energy meter is connected with the MCU.
Preferably, the electric energy meter testing device further comprises a 485 power communication line, and the MCU is in communication connection with the electric energy meter to be tested through the 485 power communication line, so that the active total electric quantity of the electric energy meter to be tested is obtained.
Compared with the prior art, the technical scheme of the invention has the beneficial effects that:
the invention provides an electric energy meter testing method and device, which can calculate the error of the electric energy meter to be tested by acquiring the active total electric quantity background of the electric energy meter to be tested and the active total electric quantity background of an MCU (microprogrammed control Unit) between two jumps, complete the electric energy meter testing, do not need an additional standard power supply for supplying power, and do not need a power supply department to disassemble the electric energy meter to be tested on site first and then send the electric energy meter to be tested to a laboratory for word walking testing, thereby greatly simplifying the testing process and shortening the testing time.
Drawings
FIG. 1 is a flow chart of the steps for implementing the technical solution of the present invention;
fig. 2 is a schematic diagram of the module connection according to the present invention.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the patent;
for the purpose of better illustrating the present embodiments, certain elements of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product;
it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The technical solution of the present invention is further described below with reference to the accompanying drawings and examples.
Example 1
As shown in fig. 1, a method for testing an electric energy meter includes the following steps:
s1: starting a test, and recording the active total electric quantity background of the MCU during starting;
s2: acquiring the active total electric quantity background of the electric energy meter to be detected and the active total electric quantity of the MCU in real time;
s3: judging whether the bottom degree of the active total electric quantity of the current electric energy meter to be tested generates first jumping or not;
if yes, executing step S4; if not, returning to the step S2;
s4: recording the active total electric quantity bottom degree of the electric energy meter to be tested and the active total electric quantity bottom degree of the MCU during the first jumping, and calculating the active total electric quantity bottom degree of the electric energy meter to be tested at the starting moment;
s5: acquiring the active total electric quantity background of the electric energy meter to be detected and the active total electric quantity background of the MCU after the first jump in real time;
s6: judging whether the active total electric quantity background of the current electric energy meter to be tested generates second jumping or not;
if yes, executing step S7; if not, executing the step S5;
s7: and calculating the error of the electric energy meter to be tested to finish the test of the electric energy meter.
In the specific implementation process, the MCU and the electric energy meter to be tested start testing at the same time, the test of the running word is stopped at the same time, and the error of the electric energy meter to be tested is calculated by obtaining the active total electric quantity background of the electric energy meter to be tested and the active total electric quantity background of the MCU between two jumps in the testing time, so that the electric energy meter testing is completed; the voltage and the current required by the test are obtained from the electric energy meter to be tested, so that extra standard power supply is not needed, the electric energy meter to be tested does not need to be disassembled on site by a power supply department, and then the electric energy meter to be tested is sent to a laboratory for a word-walking test, the test flow is simplified to a great extent, and the test time is shortened.
More specifically, in step S1, before starting the test, establishing a communication connection between the MCU and the electric energy meter to be tested is further included, specifically:
s1.1: the MCU builds a communication command frame and sends the communication command frame to the electric energy meter to be tested;
s1.2: judging whether the electric energy meter to be tested successfully receives the communication command frame within the set time and responding;
if so, successfully establishing communication connection between the MCU and the electric energy meter to be tested;
if not, the MCU changes the communication baud rate and the parity check bit and returns to the step S1.1.
In a specific implementation process, the MCU establishes a communication command frame according to a communication protocol of a DL/T645-2007 multifunctional electric energy meter and a communication protocol of a DL/T645-1997 multifunctional electric energy meter and sends the communication command frame to the electric energy meter to be tested through a 485 power communication line.
More specifically, in step S2, the MCU active total power is obtained through the following steps:
s2.1: collecting the voltage and the current of the electric energy meter to be measured at a fixed frequency to obtain a current discrete signal I (t) and a voltage discrete signal U (t);
s2.2: and (3) obtaining instantaneous active power P by integrating I (t) and U (t), wherein the calculation formula is as follows:
wherein T is time and T is total time;
s2.3: the method comprises the following steps of carrying out continuous time integration on instantaneous active power to obtain the active total electric quantity E of the electric energy meter to be measured in a corresponding time period, wherein the calculation formula is as follows:
wherein, P (t) is the instantaneous active power at the moment t.
More specifically, in step S2.1, the fixed frequency ranges from 40KHZ to 60KHZ.
More specifically, in step S2.1, the voltage and current of the electric energy meter to be measured are collected at a frequency of 50 KHZ.
More specifically, the active total electric quantity background of the electric energy meter to be tested is obtained by communication between the MCU and the electric energy meter to be tested.
More specifically, the present invention is to provide a novel,in step S4, the bottom degree E of the active total electric quantity of the electric energy meter to be measured during starting is calculated through the following formula S0 ：
E S0 ＝E S -(E M -E M0 )
Wherein E is S The active total electric quantity bottom degree, E, of the electric energy meter to be measured during the first jump M Is the active total electric quantity bottom degree, E, of the MCU at the first jump M0 The active total electric quantity of the MCU is at the bottom of the start.
More specifically, in step S7, the error Err of the electric energy meter to be measured is calculated by the following formula:
E ΔM ＝E M1 -E M0
E ΔS ＝E S1 -E S0
wherein E is ΔM For the running power of the MCU, E M1 The bottom of the active total electric quantity of the MCU at the second jump, E M0 For the active total electric quantity bottom of MCU at start-up, E ΔS For the running power of the electric energy meter to be measured, E S1 The bottom degree of the active total electric quantity of the electric energy meter to be measured during the second jump, E S0 The active total electric quantity of the electric energy meter to be tested is the active total electric quantity background during starting.
Example 2
As shown in fig. 2, an electric energy meter testing apparatus, which is applied to implement the electric energy meter testing method, includes an electric energy meter to be tested, an electric energy meter and an MCU; the electric energy meter is used for carrying out A/D acquisition on a voltage signal and a current signal of the electric energy meter to be measured, actual active total electric quantity in a corresponding time interval is obtained through differential-integral operation, and the active total electric quantity in the corresponding time interval obtained through the differential-integral operation of the electric energy meter is accumulated by using an electric energy accumulation timer in the MCU to obtain the forward active digital electric quantity of the MCU; the MCU is used for communicating with the electric energy meter to be tested to obtain the active total electric quantity of the electric energy meter to be tested; the electric energy meter to be tested is respectively connected with the electric energy meter and the MCU, and the electric energy meter is connected with the MCU.
In the specific implementation process, the voltage and the current are obtained from the electric energy meter to be tested, extra standard power supply is not needed, the electric energy meter to be tested does not need to be disassembled, and the test flow is simplified to a great extent. Meanwhile, the MCU and the electric energy meter to be measured detect the same voltage and current, and the error measurement precision of the electric energy meter can be effectively improved.
More specifically, still include 485 electric power communication line, MCU passes through 485 electric power communication line with the electric energy meter communication connection that awaits measuring to obtain the electric energy meter active total electric quantity that awaits measuring.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (9)
1. An electric energy meter testing method is characterized by comprising the following steps:
s1: starting a test, and recording the active total electric quantity background of the MCU during starting;
s2: acquiring the active total electric quantity background of the electric energy meter to be detected and the active total electric quantity of the MCU in real time;
s3: judging whether the bottom degree of the active total electric quantity of the current electric energy meter to be tested generates first jumping or not;
if yes, executing step S4; if not, returning to the step S2;
s4: recording the bottom degree of the active total electric quantity of the electric energy meter to be detected and the bottom degree of the active total electric quantity of the MCU during the first jump, and calculating the bottom degree of the active total electric quantity of the electric energy meter to be detected at the starting moment;
s5: acquiring the active total electric quantity background of the electric energy meter to be detected and the active total electric quantity background of the MCU after the first jump in real time;
s6: judging whether the bottom degree of the active total electric quantity of the current electric energy meter to be tested generates second jumping or not;
if yes, executing step S7; if not, executing the step S5;
s7: calculating the error of the electric energy meter to be tested, and completing the test of the electric energy meter;
calculating the error Err of the electric energy meter to be measured by the following formula:
E ΔM ＝E M1 -E M0
E ΔS ＝E S1 -E S0
wherein E is ΔM For the running power of the MCU, E M1 The bottom of the active total electric quantity of the MCU at the second jump, E M0 For the active total electric quantity bottom of MCU at start-up, E ΔS For the running power of the electric energy meter to be measured, E S1 The bottom degree of the active total electric quantity of the electric energy meter to be measured during the second jump, E S0 The active total electric quantity of the electric energy meter to be tested is the active total electric quantity background during starting.
2. The method for testing the electric energy meter according to claim 1, wherein in step S1, before starting the test, a communication connection is established between the MCU and the electric energy meter to be tested, specifically:
s1.1: the MCU builds a communication command frame and sends the communication command frame to the electric energy meter to be tested;
s1.2: judging whether the electric energy meter to be tested successfully receives the communication command frame within the set time and responding;
if so, successfully establishing communication connection between the MCU and the electric energy meter to be tested;
if not, the MCU changes the communication baud rate and the parity check bit and returns to the step S1.1.
3. The electric energy meter testing method according to claim 1, wherein in step S2, the active total electric quantity of the MCU is obtained by the following steps:
s2.1: collecting the voltage and the current of the electric energy meter to be measured at a fixed frequency to obtain a current discrete signal I (t) and a voltage discrete signal U (t);
s2.2: and (3) obtaining instantaneous active power P by integrating I (t) and U (t), wherein the calculation formula is as follows:
wherein T is time and T is total time;
s2.3: the method comprises the following steps of obtaining the active total electric quantity E of the electric energy meter to be measured in a corresponding time period by carrying out continuous time integration on the instantaneous active power, wherein the calculation formula is as follows:
wherein, P (t) is the instantaneous active power at the moment t.
4. A method according to claim 3, characterized in that in step S2.1, the fixed frequency is in the range of 40KHZ to 60KHZ.
5. The method for testing the electric energy meter according to claim 4, wherein in step S2.1, the voltage and the current of the electric energy meter to be tested are collected at a frequency of 50 KHZ.
6. The method for testing the electric energy meter according to claim 1, wherein the active total electric quantity background of the electric energy meter to be tested is obtained by the MCU through communication with the electric energy meter to be tested.
7. The method as claimed in claim 1, wherein in step S4, the active total electric quantity bottom E of the electric energy meter to be tested at startup is calculated by the following formula S0 ：
E S0 ＝E S -(E M -E M0 )
Wherein E is S The active total electric quantity bottom degree, E, of the electric energy meter to be measured during the first jump M Is the active total electric quantity bottom degree, E, of the MCU at the first jump M0 The active total electric quantity of the MCU is at the bottom of the start.
8. An electric energy meter testing device of an electric energy meter testing method according to any one of claims 1 to 7, characterized by comprising an electric energy meter to be tested, an electric energy meter and an MCU; the electric energy meter is used for carrying out A/D acquisition on a voltage signal and a current signal of the electric energy meter to be measured, obtaining the active total electric quantity in a corresponding time period through differential-integral operation, and obtaining the forward active word-walking electric quantity of the MCU after accumulating the active total electric quantity in the corresponding time period obtained through the differential-integral operation of the electric energy meter by using an electric energy accumulation timer in the MCU; the MCU is used for communicating with the electric energy meter to be tested to obtain the active total electric quantity of the electric energy meter to be tested; the electric energy meter to be tested is respectively connected with the electric energy meter and the MCU, and the electric energy meter is connected with the MCU.
9. The device for testing the electric energy meter according to claim 8, further comprising a 485 power communication line, wherein the MCU is in communication connection with the electric energy meter to be tested through the 485 power communication line, so as to obtain the total active electric quantity of the electric energy meter to be tested.
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