CN111413660A - Method and system for testing error self-detection function of electric energy meter - Google Patents
Method and system for testing error self-detection function of electric energy meter Download PDFInfo
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- CN111413660A CN111413660A CN202010355124.7A CN202010355124A CN111413660A CN 111413660 A CN111413660 A CN 111413660A CN 202010355124 A CN202010355124 A CN 202010355124A CN 111413660 A CN111413660 A CN 111413660A
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Abstract
The application provides a test method and a test system for an electric energy meter error self-detection function, and the test method comprises the steps that a main controller sets a control signal, the control signal is sent to a waveform generation module and a signal amplification module, the waveform generation module responds to the control signal to generate a basic electric wave signal, the basic electric wave signal is sent to a signal superposition module, the signal amplification module extracts an electric energy meter self-detection signal, the amplitude of the electric energy meter self-detection signal is amplified or reduced in response to the control signal to generate an adjustment signal, the adjustment signal is sent to the signal superposition module, the signal superposition module receives the basic electric wave signal and the adjustment signal to generate a sampling signal in a superposition mode, and the sampling signal is input into the electric energy meter by the signal superposition module to carry out the error self-detection function test. And after the theoretical result value and the self-detection result value are obtained, comparing the difference between the theoretical result value and the self-detection result value with a preset difference range, and realizing the automatic test of the error self-detection function of the electric energy meter.
Description
Technical Field
The application relates to the technical field of testing of an electric energy meter error self-detection function, in particular to a testing method and system of the electric energy meter error self-detection function.
Background
The electric energy meter error self-detection function is a self-detection function of the intelligent electric energy meter through setting a self-detection chip, a standard source is provided in the self-detection chip, the standard source is overlapped with a current and voltage source to be actually sampled, sampling is carried out through an ADC (Analog-to-Digital Converter) after the sensor, a self-detection signal is extracted, and calculation is carried out according to the amplitude and the phase of the self-detection signal.
In practical application, no system or method capable of automatically detecting whether the error self-detection function of the electric energy meter normally operates exists. Usually, the electric energy meter circuit needs to be modified, and the connection circuit is artificially modified to perform testing in a resistor-capacitor series-parallel connection mode.
The electric energy meter is required to be disassembled in the detection process, and the electric energy meter is easily damaged in the disassembling process. If the electric energy meter is damaged due to human factors in the disassembly process, the electric energy meter which can normally work is wasted in resources, and the problem of automatic testing of the metering error self-detection function of the electric energy meter cannot be solved.
Disclosure of Invention
The application provides a method and a system for testing an error self-detection function of an electric energy meter, which aim to solve the problem that the metering error self-detection function of the electric energy meter cannot be automatically tested.
In one aspect, the present application provides a method for testing an error self-detection function of an electric energy meter, including:
the main controller sets a control signal and sends the control signal to the waveform generation module and the signal amplification module;
the waveform generation module generates a basic electric wave signal in response to the control signal and sends the basic electric wave signal to the signal superposition module;
the signal amplification module extracts a self-detection signal of the electric energy meter, amplifies or reduces the amplitude of the self-detection signal of the electric energy meter in response to a control signal, generates an adjustment signal, and sends the adjustment signal to the signal superposition module;
the signal superposition module receives the basic electric wave signal and the adjusting signal and superposes the basic electric wave signal and the adjusting signal to generate a sampling signal;
and the signal superposition module inputs the sampling signal into the electric energy meter to carry out error self-detection function test.
Optionally, the method provided by the present application further includes:
acquiring a self-detection result value and a theoretical result value of the electric energy meter;
calculating the difference value between the self-detection result value and the theoretical result value to obtain a test difference value;
if the test difference value is within the preset difference value range, the self-test function of the electric energy meter is normal;
and if the test difference value is not within the preset difference value range, the self-test function of the electric energy meter is abnormal.
Optionally, the control signal includes: a voltage control signal and a current control signal;
the step of setting the control signal by the main controller comprises the following steps:
if the control signal set by the main controller is a voltage control signal, the main controller sends the voltage control signal to the voltage signal amplification module;
if the control signal is a current control signal, the main controller sends the current control signal to the current signal amplification module.
Optionally, if the self-detection signal of the electric energy meter received by the signal amplification module is a voltage self-detection signal, the voltage signal amplification module receives the voltage self-detection signal and generates a voltage adjustment signal;
if the self-detection signal is a current self-detection signal, the current signal amplification module receives the current self-detection signal and generates a current adjustment signal.
Optionally, the waveform generating module generates a basic voltage signal or a basic current signal according to the control signal after receiving the control signal.
Optionally, if the waveform generation module generates a basic voltage signal, the waveform generation module sends the basic voltage signal to the voltage superposition module;
if the basic current signal is generated, the waveform generation module sends the basic current signal to the current superposition module.
Optionally, the voltage superposition module receives the voltage adjustment signal and the basic voltage signal, and superposes the voltage adjustment signal and the basic voltage signal to generate a voltage sampling signal;
the current superposition module receives the current adjustment signal and the basic current signal, superposes the current adjustment signal and the basic current signal, and generates a current sampling signal.
On the other hand, the application also provides a test system for the error self-detection function of the electric energy meter, which comprises: the device comprises a main controller, a waveform generation module, a signal amplification module, a signal superposition module and an electric energy meter;
the main controller is respectively connected with the waveform generation module and the signal amplification module and is used for setting a control signal and sending the control signal to the waveform generation module and the signal amplification module;
the waveform generation module is connected with the signal superposition module and used for generating a basic electric wave signal;
the signal amplification module is respectively connected with the signal superposition module and the electric energy meter and is used for receiving a self-detection signal of the electric energy meter and amplifying or reducing the amplitude of the self-detection signal to generate an adjustment signal;
the signal superposition module is connected with the electric energy meter and is used for superposing the basic electric wave signal and the adjusting signal to generate a sampling signal;
the electric energy meter is used for receiving the sampling signal and testing the sampling signal.
According to the technical scheme, the testing method and system for the error self-detection function of the electric energy meter comprise that a main controller sets a control signal and sends the control signal to a waveform generation module and a signal amplification module, the waveform generation module generates a basic electric wave signal in response to the control signal and sends the basic electric wave signal to a signal superposition module, the signal amplification module extracts the self-detection signal of the electric energy meter, amplifies or reduces the amplitude of the self-detection signal of the electric energy meter in response to the control signal to generate an adjustment signal, and sends the adjustment signal to the signal superposition module, the signal superposition module receives the basic electric wave signal and the adjustment signal to superpose the basic electric wave signal and the adjustment signal to generate a sampling signal, and the signal superposition module inputs the sampling signal into the electric energy meter to test the error self-detection function. The method comprises the steps of obtaining a theoretical result value and a self-detection result value by changing a self-detection loop of the electric energy meter, and then comparing the difference of the theoretical result value and the self-detection result value with a preset difference range to realize automatic test of the error self-detection function of the electric energy meter.
Drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of a method for testing an error self-test function of an electric energy meter;
FIG. 2 is a flow chart of the error self-test function test of the electric energy meter;
FIG. 3 is a flow chart of the main controller setting control signals;
FIG. 4 is a flow chart of the signal amplification module;
FIG. 5 is a flow chart of the waveform generation module;
FIG. 6 is a block diagram of a test system for an error self-test function of an electric energy meter.
Detailed Description
Reference will now be made in detail to embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following examples do not represent all embodiments consistent with the present application. But merely as exemplifications of systems and methods consistent with certain aspects of the application, as recited in the claims.
As shown in fig. 1, a flow chart of a method for testing an error self-detection function of an electric energy meter is shown, and the method includes the following steps:
s1: the main controller sets a control signal and sends the control signal to the waveform generation module and the signal amplification module.
The main controller means a command controller that plays a main role in a given time interval in a system having a plurality of command controllers. Other command controllers are subordinate to this master controller. But at other time intervals the master controller may be slaved to another command controller. The functions of the master controller include: controlling the starting and stopping of processing, controlling the starting and stopping of operation, generating time sequence pulse and the like. In the technical scheme provided by the application, the main controller is used as a core component of the whole system and is responsible for controlling the waveform generation module to send out a basic electric wave signal and controlling the amplification times of the signal amplification module.
Referring to fig. 3, a flow chart for setting a control signal for a main controller includes the following steps:
s11: and if the control signal set by the main controller is a voltage control signal, the main controller sends the voltage control signal to a voltage signal amplification module.
S12: and if the control signal is a current control signal, the main controller sends the current control signal to a current signal amplification module.
In practical application, because the electric energy meters have different types, the electric energy meters of different types measure different power consumption modes, and are not only limited to the measurement of one electric energy mode, in the technical scheme provided by the application, the main controller can set different control signals according to different electric energy modes.
In the technical scheme provided by the application, the main controller respectively sets control signals aiming at current and voltage. And then the control signal is sent to the corresponding signal amplification module, and the design mode can realize the purpose of testing various types of electric energy meters by one system and improve the efficiency of testing work.
In practical application, corresponding adjustment can be made according to the type of the electric energy meter, for example, when the electric energy meter to be tested is a single-phase electric energy meter, the main controller sets a control signal according to the electric energy metering mode of the single-phase electric energy meter so as to adapt to the test of the self-detection function of the electric energy meter.
S2: the waveform generation module generates a base electric wave signal in response to the control signal, and transmits the base electric wave signal to the signal superposition module.
The waveform generator is a data signal generator, and when debugging hardware, signals are often added to observe whether the circuit works normally. In the technical scheme provided by the application, the waveform generation module adopts a dual-channel waveform generator and is used for providing sine waves so as to generate basic electric wave signals.
Further, please refer to fig. 5, which is a flowchart illustrating the operation of the waveform generating module.
S21: and if the waveform generation module generates the basic voltage signal, the waveform generation module sends the basic voltage signal to a voltage superposition module.
S22: and if the basic current signal is generated, the waveform generation module sends the basic current signal to a current superposition module.
In the technical scheme provided by the application, the waveform generation module generates a basic electric wave signal by responding to a control signal. The control signal comprises a voltage control signal and a current control signal, and if the control signal received by the waveform generation module is the voltage control signal, the waveform generation module responds to the voltage control signal to generate a basic voltage signal; if the control signal received by the waveform generation module is a current control signal, the waveform generation module generates a base current signal in response to the signal. And then the waveform generation module sends the basic voltage signal and the basic current signal to the corresponding superposition module.
The dual-channel waveform generator can generate basic electric wave signals required by testing aiming at the control signals, and the design mode can generate various basic electric wave signals and adjust various detection signals of the electric energy meter. The waveform generator has the function of multiple channels, so in practical application, the waveform generator can be set to be a multi-channel waveform generator to adapt to the test of different types of electric energy meters, and the application range of the application is enlarged.
S3: the signal amplification module extracts a self-detection signal of the electric energy meter, responds to the control signal amplification or reduction of the amplitude of the self-detection signal of the electric energy meter, generates an adjustment signal, and sends the adjustment signal to the signal superposition module.
According to the technical scheme, the signal amplification module can modify the amplitude of the standard source signal of the electric energy meter for detecting the error. And modifying the self-detection signal of the electric energy meter by responding to the control signal.
Referring to fig. 4, a flowchart of a signal amplification module is shown.
S31: if the electric energy meter self-detection signal extracted by the signal amplification module is a voltage self-detection signal, the voltage signal amplification module extracts the voltage self-detection signal and generates a voltage adjustment signal.
S32: if the self-detection signal is a current self-detection signal, the current signal amplification module extracts the current self-detection signal and generates a current adjustment signal.
In practical application, since the electric energy meter is provided with a plurality of communication interfaces, the voltage signal amplification module and the current signal amplification module are provided according to the application. The design mode can be used for extracting different signals independently, mutual interference cannot be caused, and the design mode can also be used for setting a certain signal in the test process.
For example, only to test whether the current error self-detection function of the electric energy meter is normal, the control signal can be set for the current self-detection signal. If only the voltage error self-detection function is tested to be normal, a control signal can be set aiming at the voltage self-detection signal. The two signals can be tested simultaneously, and because different tests have independent test loops, the system tests different control signals under different control signals to obtain corresponding test results, and interference among the tests cannot be caused.
By adopting the design mode, various test signals can have respective test loops, and each test loop only tests specific test signals in the test process, so that interference among the test loops can not be caused, the accuracy of test results is ensured when multiple signals are tested simultaneously, and the working efficiency of the system can be improved.
S4: the signal superposition module receives the basic electric wave signal and the adjusting signal, and superposes the basic electric wave signal and the adjusting signal to generate a sampling signal.
In the technical scheme provided by the application, the signal superposition module is used for superposing the basic electric wave signal and the adjusting signal and then generating the sampling signal.
The signal superposition module comprises a voltage superposition module and a current superposition module, and the voltage superposition module is used for receiving the voltage adjustment signal and the basic voltage signal, superposing the two signals and generating a voltage sampling signal; the current superposition module is used for receiving the current adjustment signal and the basic current signal, and then superposing the two signals to generate a current sampling signal.
In practical application, the superposition module superposes a plurality of signals of the same type, so as to generate a certain type of sampling signal. The design can be used in the self-test function test of the electric energy meter with various communication interfaces. The various superposition modules independently generate a corresponding sampling signal, and signal interference cannot be caused among the sampling signals, so that the test accuracy of the test system is improved.
S5: and the signal superposition module inputs the sampling signal into the electric energy meter to carry out error self-detection function test.
According to the technical scheme, the electric energy meter carries out error self-detection function test after receiving the sampling signal. Please refer to fig. 2 for the detailed steps.
S51: and acquiring a self-detection result value and a theoretical result value of the electric energy meter.
S52: and calculating the difference value between the self-detection result value and the theoretical result value to obtain a test difference value.
S53: and if the test difference value is within the preset difference value range, the self-test function of the electric energy meter is normal.
S54: and if the test difference value is not within the preset difference value range, the self-test function of the electric energy meter is abnormal.
In practical application, since the electric energy meter has a self-detection function, a self-detection result value can be obtained. The test system itself obtains a theoretical result value. The test system obtains a test difference value by calculating the difference value between the self-test result value and the theoretical result value.
The calculation process of the theoretical result value is as follows:
setting the amplification factor of the main controller to KI0And KU0And calibrating the meter, and reading the current error value, wherein the ideal value is 0.
Setting the amplification factor of the main controller to KI again1And KU1，
Then comparing the test difference value with a preset difference value range, and if the test difference value is within the preset difference value range, the self-test function of the electric energy meter is normal; and if the test difference value is not within the preset difference value range, the self-test function of the electric energy meter is abnormal.
By adopting the testing method, each testing parameter can be linearly modified according to the testing requirement, so that the problem that the circuit of the electric energy meter needs to be modified when the self-testing function of the electric energy meter is tested is solved. The technical scheme that this application provided realizes the automatic test of electric energy meter self test function on the basis that need not modify the former circuit of electric energy meter, can save the time that repacking electric energy meter circuit under conventional test method to and avoid dismantling the damage that the repacking in-process caused the electric energy meter, can also practice thrift the test cost when improving work efficiency.
The application also provides a test system with the function of self-detecting the error of the electric energy meter. Please refer to fig. 6, which is a block diagram of a testing system for an error self-testing function of an electric energy meter.
The system comprises: the device comprises a main controller, a waveform generation module, a signal amplification module, a signal superposition module and an electric energy meter.
The main controller is respectively connected with the waveform generation module and the signal amplification module and is used for setting a control signal and sending the control signal to the waveform generation module and the signal amplification module.
The waveform generation module is connected with the signal superposition module and used for generating a basic electric wave signal.
The signal amplification module is respectively connected with the signal superposition module and the electric energy meter and is used for receiving the self-detection signal of the electric energy meter and amplifying or reducing the amplitude of the self-detection signal to generate an adjustment signal.
The signal superposition module is connected with the electric energy meter and is used for superposing the basic electric wave signal and the adjusting signal to generate a sampling signal.
The electric energy meter is used for receiving the sampling signal and testing the sampling signal.
Further, the main controller may set a voltage control signal and a current control signal, so as can be seen from fig. 6, the main controller, the waveform generating module, the current superimposing module, the electric energy meter, and the current signal amplifying module may form a current self-detection function test loop.
The main controller, the waveform generation module, the voltage superposition module, the electric energy meter and the voltage signal amplification module can form a voltage self-detection function test loop.
In practical applications, since the electric energy meter is usually provided with a plurality of communication interfaces for receiving and metering different kinds of electric signals, the modules in the present application can be adjusted accordingly. For example, the electric energy meter is provided with four communication interfaces, the main controller can be provided with four control signals, the corresponding waveform generation module can adopt a four-channel waveform generator, and the signal amplification module and the superposition module are correspondingly adjusted, so that the electric energy meter can adapt to different types of electric energy meters with self-detection functions. By adopting the design, the use flexibility of the application is improved, and the use range is enlarged.
Therefore, according to the above technical solutions, the method and system for testing the error self-detection function of the electric energy meter provided by the present application include setting a control signal by a main controller, and sending the control signal to a waveform generation module and a signal amplification module, the waveform generation module generating a basic electric wave signal in response to the control signal, and sending the basic electric wave signal to a signal superposition module, the signal amplification module extracting the self-detection signal of the electric energy meter, amplifying or reducing an amplitude of the self-detection signal of the electric energy meter in response to the control signal, generating an adjustment signal, and sending the adjustment signal to the signal superposition module, the signal superposition module receiving the basic electric wave signal and the adjustment signal, superposing the basic electric wave signal and the adjustment signal to generate a sampling signal, and the signal superposition module inputting the sampling signal into the electric energy meter to perform the error self-detection function test. And after the theoretical result value and the self-detection result value are obtained, comparing the difference between the theoretical result value and the self-detection result value with a preset difference range, and realizing the automatic test of the error self-detection function of the electric energy meter.
The embodiments provided in the present application are only a few examples of the general concept of the present application, and do not limit the scope of the present application. Any other embodiments extended according to the scheme of the present application without inventive efforts will be within the scope of protection of the present application for a person skilled in the art.
Claims (8)
1. A method for testing an error self-detection function of an electric energy meter is characterized by comprising the following steps:
the main controller sets a control signal and sends the control signal to the waveform generation module and the signal amplification module;
the waveform generation module generates a basic electric wave signal in response to the control signal and sends the basic electric wave signal to a signal superposition module;
the signal amplification module extracts a self-detection signal of the electric energy meter, amplifies or reduces the amplitude of the self-detection signal of the electric energy meter in response to the control signal, generates an adjustment signal, and sends the adjustment signal to the signal superposition module;
the signal superposition module receives the basic electric wave signal and the adjusting signal and superposes the basic electric wave signal and the adjusting signal to generate a sampling signal;
and the signal superposition module inputs the sampling signal into the electric energy meter to carry out error self-detection function test.
2. The method for testing the error self-detection function of the electric energy meter according to claim 1, further comprising:
acquiring a self-detection result value and a theoretical result value of the electric energy meter;
calculating the difference value between the self-detection result value and the theoretical result value to obtain a test difference value;
if the test difference value is within the preset difference value range, the self-test function of the electric energy meter is normal;
and if the test difference value is not within the preset difference value range, the self-test function of the electric energy meter is abnormal.
3. The method as claimed in claim 1, wherein the control signal comprises: a voltage control signal and a current control signal;
the step of setting the control signal by the main controller comprises the following steps:
if the control signal set by the main controller is a voltage control signal, the main controller sends the voltage control signal to a voltage signal amplification module;
and if the control signal is a current control signal, the main controller sends the current control signal to a current signal amplification module.
4. The method for testing the error self-detection function of the electric energy meter according to claim 1, wherein if the electric energy meter self-detection signal extracted by the signal amplification module is a voltage self-detection signal, the voltage signal amplification module extracts the voltage self-detection signal and generates a voltage adjustment signal;
if the self-detection signal is a current self-detection signal, the current signal amplification module extracts the current self-detection signal and generates a current adjustment signal.
5. The method as claimed in claim 1, wherein the waveform generating module generates a base voltage signal or a base current signal according to the control signal after receiving the control signal.
6. The method as claimed in claim 5, wherein if the waveform generation module generates the base voltage signal, the waveform generation module sends the base voltage signal to a voltage superposition module;
and if the basic current signal is generated, the waveform generation module sends the basic current signal to a current superposition module.
7. The method for testing the error self-detection function of the electric energy meter according to any one of claims 3-6, wherein the voltage superposition module receives the voltage adjustment signal and the base voltage signal, and superposes the voltage adjustment signal and the base voltage signal to generate a voltage sampling signal;
and the current superposition module receives the current adjustment signal and the basic current signal, superposes the current adjustment signal and the basic current signal, and generates a current sampling signal.
8. A test system for an electric energy meter error self-detection function is characterized by comprising: the device comprises a main controller, a waveform generation module, a signal amplification module, a signal superposition module and an electric energy meter;
the main controller is respectively connected with the waveform generation module and the signal amplification module and is used for setting a control signal and sending the control signal to the waveform generation module and the signal amplification module;
the waveform generation module is connected with the signal superposition module and used for generating a basic electric wave signal;
the signal amplification module is respectively connected with the signal superposition module and the electric energy meter and is used for receiving a self-detection signal of the electric energy meter and amplifying or reducing the amplitude of the self-detection signal to generate an adjustment signal;
the signal superposition module is connected with the electric energy meter and is used for superposing the basic electric wave signal and the adjusting signal to generate a sampling signal;
the electric energy meter is used for receiving the sampling signal and testing the sampling signal.
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| CN112816934A (en) * | 2021-03-01 | 2021-05-18 | 云南电网有限责任公司电力科学研究院 | Method and system for judging error self-monitoring accuracy and timeliness of electric energy meter |
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