CN113030839A - Multifunctional durability test device for electric energy meter - Google Patents
Multifunctional durability test device for electric energy meter Download PDFInfo
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- CN113030839A CN113030839A CN202110411786.6A CN202110411786A CN113030839A CN 113030839 A CN113030839 A CN 113030839A CN 202110411786 A CN202110411786 A CN 202110411786A CN 113030839 A CN113030839 A CN 113030839A
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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 multifunctional durability test device for an electric energy meter, which comprises a program-controlled power source cabinet and a plurality of electric energy meter test components, wherein the program-controlled power source cabinet is respectively connected with each electric energy meter test component; the electric energy meter testing component comprises an ICT current transformer, a PT transformer and a plurality of testing stations; the input end of the ICT current transformer is connected with the current output end of the program-controlled power source cabinet, and the output end of the ICT current transformer is connected with each test station; the input end of the PT transformer is connected with the voltage output end of the program-controlled power source cabinet, and the output end of the PT transformer is connected with each test station. The multifunctional durability test device for the electric energy meter ensures that one device can output various different current values and voltage values at the same time, and meets the test requirements of the electric energy meter with different current values and voltage values.
Description
Technical Field
The invention relates to electric energy meter testing, in particular to a multifunctional durability testing device for an electric energy meter.
Background
The specific requirements of the durability test are to place the meter in a temperature test chamber, raise the temperature to the upper limit temperature specified by the meter, and keep it stable (typically 2 h). The instrument voltage circuit applies 1.1 times of nominal voltage (if a plurality of nominal voltages exist, the highest nominal voltage is adopted), the current circuit is electrified with the maximum current Imax, the power factor is 1, if the instrument can measure active electric energy and reactive electric energy simultaneously, the power factor is 0.866L, and the test lasts for 1000h under the test condition. After the test is finished, the instrument is restored to the reference temperature, and the error of the instrument is measured again; the error deviation does not exceed the specified limit compared with the inherent error before and after the test. The application scene of the experimental device is mainly research and development test and durability aging test of the sample sending instrument.
The device for durability test must have high stability and reliability. The device for the durability test needs to continuously run for 1000 hours at Imax in the test process, and continuously records the error between the electric energy of the electric energy meter and the standard electric energy, so that the device for the durability test has long-term stability, reliability and safety. The device can meet the requirements of the electric energy meter type evaluation tests of the same kind of electric energy meters of the latest national grid and the south grid, and is compatible with the test requirements of the existing electric energy meters.
The existing electric energy meter calibrating device can only meet short-time test in design, the maximum requirement test can be completed within 24 hours, the design performance of the existing device is far away from the 1000-hour operation requirement, and therefore the device for the durability test needs to be newly designed.
The durability test faces the electric energy meter type evaluation tests of different manufacturers, so that the electric energy meter test requirements of different current values can appear, the electric energy meter test device can only output one current and one voltage each time, when multiple current electric energy meter tests are carried out at the same time, another electric energy meter test can be carried out only after waiting for 1000 hours, and one or more durability test devices can not meet the test requirements for electric energy meters of different voltage and current specifications.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a multifunctional durability test device for an electric energy meter, which ensures that one device can output various different current values and voltage values at the same time and meets the test requirements of the electric energy meter with different current values and voltage values.
The purpose of the invention is realized by the following technical scheme: a multifunctional durability test device for an electric energy meter comprises a program-controlled power source cabinet and a plurality of electric energy meter test components, wherein the program-controlled power source cabinet is connected with each electric energy meter test component respectively;
the electric energy meter testing component comprises an ICT current transformer, a PT transformer and a plurality of testing stations; the input end of the ICT current transformer is connected with the current output end of the program-controlled power source cabinet, and the output end of the ICT current transformer is connected with each test station; the input end of the PT transformer is connected with the voltage output end of the program-controlled power source cabinet, and the output end of the PT transformer is connected with each test station.
Furthermore, the number of the test stations of each electric energy meter test component is n, and each test station is provided with an electric energy meter to be tested, wherein the electric energy meter to be tested in the first test station is a lead meter, and the electric energy meters to be tested in other test stations are test meters.
Further, a program-controlled power source and a standard electric energy meter are arranged in the program-controlled power source cabinet; the program-controlled power source comprises three signal generating channels, and signals output by the signal generating channels are transmitted to each electric energy meter testing component after passing through the electric energy meters;
each signal generating channel comprises a direct digital synthesis signal source, a feedback compensation adjusting circuit, a current power amplifier, a current booster, a voltage power amplifier, a voltage booster, a standard current sampling module and a standard voltage sampling module; the direct digital synthesis signal source is used for generating an initial current signal and an initial voltage signal, the initial current signal sequentially passes through the current power amplifier and the current booster and then outputs a current signal to the outside, and the standard current sampling module is used for sampling the output current to obtain a current sampling signal and feeding the current sampling signal back to the feedback compensation adjusting circuit; the initial voltage signal is output to the outside after passing through the voltage power amplifier and the booster, and the labeled voltage sampling module is used for sampling the output voltage to obtain a voltage sampling signal and feeding the voltage sampling signal back to the feedback compensation adjusting circuit.
The feedback compensation adjusting circuit comprises a first adjustable gain operational amplifier, a first adjustable phase shifter, a second adjustable gain amplifier, a second adjustable phase shifter, a first amplitude detector, a first phase detector, a second amplitude detector, a second phase detector, a single chip microcomputer and a display;
the input end of the first adjustable gain operational amplifier receives an initial current signal, and the output end of the first adjustable gain operational amplifier is connected with the current power amplifier through a first adjustable phase shifter; the input end of the second adjustable gain operational amplifier receives an initial voltage signal, and the output end of the second adjustable gain operational amplifier is connected with the voltage power amplifier through a second adjustable phase shifter;
the first amplitude detector is used for detecting the amplitudes of the initial current signal and the initial voltage signal, and the second amplitude detector is used for detecting the amplitudes of the voltage sampling signal and the current sampling signal; the first phase detector is used for detecting the phases of an initial current signal and an initial voltage signal, the second phase detector is used for detecting the phases of a voltage sampling signal and a current sampling signal, the output ends of the first amplitude detector, the first phase detector, the second amplitude detector and the second phase detector are all connected with a single chip microcomputer, and the single chip microcomputer is further connected with a display.
Furthermore, a PC (personal computer) and a serial server are also arranged in the program-controlled power source cabinet, the PC is connected with each direct digital synthesis signal source in the program-controlled power source, and the serial server is respectively connected with the standard electric energy meter and the electric energy meter to be tested in each test station; the serial server is also connected with a PC computer.
Furthermore, the multifunctional durability test device further comprises a power amplifier power supply and a protection circuit, and the output end of the power amplifier power supply supplies power to the whole program-controlled power source cabinet after passing through the protection circuit.
The invention has the beneficial effects that:
(1) the invention adopts the current and voltage conversion technology, can simultaneously output various different current and voltage values on one test, and meets the requirements of the electric energy meters with different current and voltage values on the simultaneous test.
(2) The invention can provide long-term stable power output and ensure that the measurement technical parameters can be effectively traced and calibrated.
Drawings
FIG. 1 is a schematic diagram of the apparatus of the present invention;
FIG. 2 is a functional block diagram of a programmable power source;
FIG. 3 is a schematic diagram of a feedback compensation adjustment circuit;
fig. 4 is a schematic diagram of the testing principle of the invention.
Detailed Description
The technical solutions of the present invention are further described in detail below with reference to the accompanying drawings, but the scope of the present invention is not limited to the following.
As shown in fig. 1, the multifunctional durability test device for the electric energy meter comprises a program-controlled power source cabinet and a plurality of electric energy meter test components, wherein the program-controlled power source cabinet is connected with each electric energy meter test component respectively;
the electric energy meter testing component comprises an ICT current transformer, a PT transformer and a plurality of testing stations; the input end of the ICT current transformer is connected with the current output end of the program-controlled power source cabinet, and the output end of the ICT current transformer is connected with each test station; the input end of the PT transformer is connected with the voltage output end of the program-controlled power source cabinet, and the output end of the PT transformer is connected with each test station.
In the embodiment of the application, the test stations of each electric energy meter test assembly are n (n is 3 in fig. 1), and each test station is provided with one electric energy meter to be tested, wherein the electric energy meter to be tested in the first test station is a lead meter, and the electric energy meters to be tested in other test stations are test meters.
In an embodiment of the application, a program-controlled power source and a standard electric energy meter are arranged in the program-controlled power source cabinet; as shown in fig. 2, the program-controlled power source includes three signal generating channels, and signals output by the signal generating channels are transmitted to each electric energy meter testing component after passing through the electric energy meters;
each signal generating channel comprises a direct digital synthesis signal source, a feedback compensation adjusting circuit, a current power amplifier, a current booster, a voltage power amplifier, a voltage booster, a standard current sampling module and a standard voltage sampling module; the direct digital synthesis signal source is used for generating an initial current signal and an initial voltage signal, the initial current signal sequentially passes through the current power amplifier and the current booster and then outputs a current signal to the outside, and the standard current sampling module is used for sampling the output current to obtain a current sampling signal and feeding the current sampling signal back to the feedback compensation adjusting circuit; the initial voltage signal is output to the outside after passing through the voltage power amplifier and the booster, and the labeled voltage sampling module is used for sampling the output voltage to obtain a voltage sampling signal and feeding the voltage sampling signal back to the feedback compensation adjusting circuit.
In the embodiment of the present application, for a three-phase electric energy meter, one phase may be generated by each signal generating channel, for example, in fig. 2, a first signal generating channel generates a current signal Ia and a voltage signal Ua of a phase, a second signal generating channel generates a current signal Ib and a voltage signal Ub of a phase B, and a third signal generating channel generates a current signal Ic and a voltage signal Uc of a phase C;
as shown in fig. 3, in the embodiment of the present application, the feedback compensation adjustment circuit includes a first adjustable gain operational amplifier, a first adjustable phase shifter, a second adjustable gain amplifier, a second adjustable phase shifter, a first amplitude detector, a first phase detector, a second amplitude detector, a second phase detector, a single chip, and a display;
the input end of the first adjustable gain operational amplifier receives an initial current signal, and the output end of the first adjustable gain operational amplifier is connected with the current power amplifier through a first adjustable phase shifter; the input end of the second adjustable gain operational amplifier receives an initial voltage signal, and the output end of the second adjustable gain operational amplifier is connected with the voltage power amplifier through a second adjustable phase shifter;
the first amplitude detector is used for detecting the amplitudes of the initial current signal and the initial voltage signal, and the second amplitude detector is used for detecting the amplitudes of the voltage sampling signal and the current sampling signal; the first phase detector is used for detecting the phases of an initial current signal and an initial voltage signal, the second phase detector is used for detecting the phases of the voltage sampling signal and the current sampling signal, and the first amplitude detector, the first phase detector, the second amplitude detector and the second phase detector transmit acquired signals to the display through the single chip microcomputer to be displayed. The working personnel can observe the amplitude information of the initial current signal and the amplitude information of the sampled current signal, judge whether the required current amplification factor is completed or not according to the amplitude information, and adjust the amplitude of the current signal through the first adjustable gain operational amplifier until the required amplification factor is reached when the amplification requirement is not met; the staff can also judge whether the phases of the initial current signal and the sampling current signal are consistent through the phase information of the initial current signal and the sampling current signal, and when the phases are inconsistent, the phases are adjusted through the first adjustable phase shifter until the phases are consistent; similarly, the staff can judge whether the required voltage amplification factor is completed or not according to the initial voltage signal amplitude and the sampling voltage signal amplitude, and when the requirement is not met, the amplitude of the voltage signal is adjusted through the second adjustable gain amplifier until the required amplification factor is reached; the staff can judge whether the phase is consistent according to the initial voltage signal phase and the sampling voltage signal phase, and carries out phase shift adjustment when the phase is inconsistent until the phase is consistent. In other embodiments of the present application, the display may be eliminated, the single chip may automatically calculate an amplification factor from the initial current signal to the sampling current signal, the amplification factor from the initial voltage signal to the sampling voltage signal is automatically compared with a required amplification factor, and the first adjustable gain operational amplifier and the second adjustable gain amplifier are automatically controlled to adjust according to the amplification factor until the required amplification factor is reached.
In the embodiment of the application, a PC (personal computer) and a serial server are further arranged in the program-controlled power source cabinet, the PC is connected with each direct digital synthesis signal source in the program-controlled power source, and the serial server is respectively connected with the standard electric energy meter and the electric energy meter to be tested in each test station.
In some embodiments, the protection circuit can also adopt smoke sensing and temperature detection technologies, so that the power supply can be quickly cut off when the durability test device is damaged, and the running safety of the device can be ensured; and the output end of the power amplifier power supply supplies power to the whole program-controlled power source cabinet after passing through the protection circuit.
In the embodiment of the application, a transverse flow ventilation technology can be added to the program-controlled power source cabinet, and in the operation process of 1000h, a transverse flow fan is selected to extract cold air from the bottom of the cabinet and directly blow the surface of a power tube of the electronic power amplifier, so that the surface of the power tube is effectively cooled; hot air is pumped out of the cabinet from the top of the cabinet; therefore, the ventilation performance of the cabinet of the durability test device can be ensured, the temperature of the cabinet and the temperature of the power amplifier are not too high, and the long-term reliability of the device is ensured.
In the embodiment of the application, the standard electric energy meter is used for monitoring the output of the device and providing standard electric parameters such as standard voltage, current, phase, frequency and the like; the durability test device of the electric energy meter adopts a standard electric energy meter method to directly compare the principle to carry out a type test. The standard electric energy meter is used for comparing power in the test process, real-time power of the electric energy meter can be monitored and compared in real time in the test process, and effectiveness of the test and traceability of electric parameters are guaranteed. The serial server is used for communicating 485 channels such as a PC, a power source, an electric energy meter and the like, summarizing data to the PC computer, displaying and comparing electric parameter data of the tested electric energy meter by a display connected with or carried by the PC computer, and facilitating direct comparison with a standard;
in an embodiment of the present application, advanced direct digital synthesis signal techniques are employed. A digital synthesis sinusoidal signal source is formed by taking a powerful programmable digital logic array CPLD chip and a single chip microcomputer as cores, and the set point of a sinusoidal signal with the frequency range of 45.000 Hz-65.000 Hz and the phase of 0-360 degrees is preset. The digital quantity parameters of the sinusoidal signals are stored in a specific memory, a 3600 frequency-doubled clock is used as a periodic addressing signal, the sinusoidal signal parameters of the digital quantity are taken out, six-path digital-to-analog converters convert the sinusoidal signal parameters to obtain three-phase voltage and current approximate sinusoidal signals, and the three-phase voltage and current approximate sinusoidal signals are subjected to active low-pass filtering to become voltage and current sinusoidal signals with the distortion degree of less than 0.2%. The phase, amplitude, phase and frequency of the voltage and current signals output by the digital synthesis sinusoidal signal source are controllable. The load point requirement required by the verification of the electric energy meter can be realized by the control of a keyboard or a PC. The high stability of the dc reference of the standard pll circuit and digital-to-analog converter ensures long-term stability of the output sinusoidal signal.
The power amplifier adopts an AB type program control electronic power amplifier, an electronic power source can reach 0.03% (@3min), the stability and the accuracy of power output are ensured by using the program control electronic power source, and the error stable monitoring in the durability test process is ensured;
in the embodiment of the application, the current signals Ia, Ib and Ic generated by the cabinet for the programmable power source are connected to the terminals IAH, IBH and ICH in fig. 4, the current flows through the ICT transformer to change 100A into different current outputs such as 80A, 60A and 40A, and then returns to the cabinet for the programmable power source through the terminals IAL, IBL and ICL in fig. 4, each ICT can drive 1-n electric energy meters, and when the electric energy meters with different current types are needed for testing, a plurality of current electric energy meter tests can be simultaneously performed.
Voltage signals Ua, Ub and Uc generated by the program control power source are connected to terminals of a voltage signal UA, a voltage signal UB and a voltage signal UC shown in a figure 4 UA, a voltage signal UC and a voltage signal UC shown in a figure 4 UC, a PT transformer converts 220V into different voltages of 100V, 57.7V and the like to output, each PT can drive 1-n electric energy meters, and when the electric energy meters with different voltage types are required to be tested, the electric energy meters with various voltages can be tested at the same.
In the embodiment of the application, if the single-phase electric energy meter needs to be tested, the current signal and the voltage signal output by the program-controlled power man can be converted into the single-phase signal, and then the electric energy meter is tested; in the embodiment of the application, a plurality of groups of test stations can be added, and the signals directly output by the program-controlled power source are tested on the main loop of the program-controlled power source.
The working principle of the invention is as follows: the standard sinusoidal signals of voltage and current generated by the direct digital synthesis signal source are respectively sent to a voltage power amplifier and a current power amplifier through respective feedback compensation adjusting circuits for power amplification. The amplified sinusoidal voltage signal is boosted by a voltage transformer and then sent to the calibrated meter and the standard electric energy meter, and the amplified current signal is also boosted and then sent to the calibrated meter and the standard electric energy meter. The output voltage and current signals are fed back to a feedback compensation adjusting circuit at the front stage of the power amplifier after current and voltage feedback sampling, and the output voltage and current signals have higher output stability and lower distortion degree; the serial server collects data of each electric energy meter (the tested meter and the standard electric energy meter) to a PC computer, and the PC computer is connected with or provided with a display to display and compare electric parameter data of the tested electric energy meter, so that the direct comparison with the standard is facilitated; because the invention adopts the current and voltage conversion (ICT and PT transformers) technology, a plurality of different current and voltage values can be output on one test at the same time, and the requirements of the electric energy meters with different current and voltage values on the test at the same time are met.
While the foregoing description shows and describes a preferred embodiment of the invention, it is to be understood, as noted above, that the invention is not limited to the form disclosed herein, but is not intended to be exhaustive or to exclude other embodiments and may be used in various other combinations, modifications, and environments and may be modified within the scope of the inventive concept described herein by the above teachings or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (6)
1. The utility model provides a multi-functional durability test device of electric energy meter which characterized in that: the system comprises a program-controlled power source cabinet and a plurality of electric energy meter testing components, wherein the program-controlled power source cabinet is connected with each electric energy meter testing component respectively;
the electric energy meter testing component comprises an ICT current transformer, a PT transformer and a plurality of testing stations; the input end of the ICT current transformer is connected with the current output end of the program-controlled power source cabinet, and the output end of the ICT current transformer is connected with each test station; the input end of the PT transformer is connected with the voltage output end of the program-controlled power source cabinet, and the output end of the PT transformer is connected with each test station.
2. The multifunctional durability test device of the electric energy meter according to claim 1, characterized in that: the electric energy meter testing assembly comprises n testing stations and is characterized in that n testing stations are arranged on each electric energy meter testing assembly, each testing station is provided with an electric energy meter to be tested, the electric energy meter to be tested in the first testing station is a lead meter, and the electric energy meters to be tested in other testing stations are testing meters.
3. The multifunctional durability test device of the electric energy meter according to claim 2, characterized in that: a program-controlled power source and a standard electric energy meter are arranged in the program-controlled power source cabinet; the program-controlled power source comprises three signal generating channels, and signals output by the signal generating channels are transmitted to each electric energy meter testing component after passing through the electric energy meters;
each signal generating channel comprises a direct digital synthesis signal source, a feedback compensation adjusting circuit, a current power amplifier, a current booster, a voltage power amplifier, a voltage booster, a standard current sampling module and a standard voltage sampling module; the direct digital synthesis signal source is used for generating an initial current signal and an initial voltage signal, the initial current signal sequentially passes through the current power amplifier and the current booster and then outputs a current signal to the outside, and the standard current sampling module is used for sampling the output current to obtain a current sampling signal and feeding the current sampling signal back to the feedback compensation adjusting circuit; the initial voltage signal is output to the outside after passing through the voltage power amplifier and the booster, and the labeled voltage sampling module is used for sampling the output voltage to obtain a voltage sampling signal and feeding the voltage sampling signal back to the feedback compensation adjusting circuit.
4. The multifunctional durability test device of the electric energy meter according to claim 3, characterized in that: the feedback compensation adjusting circuit comprises a first adjustable gain operational amplifier, a first adjustable phase shifter, a second adjustable gain amplifier, a second adjustable phase shifter, a first amplitude detector, a first phase detector, a second amplitude detector, a second phase detector, a single chip microcomputer and a display;
the input end of the first adjustable gain operational amplifier receives an initial current signal, and the output end of the first adjustable gain operational amplifier is connected with the current power amplifier through a first adjustable phase shifter; the input end of the second adjustable gain operational amplifier receives an initial voltage signal, and the output end of the second adjustable gain operational amplifier is connected with the voltage power amplifier through a second adjustable phase shifter;
the first amplitude detector is used for detecting the amplitudes of the initial current signal and the initial voltage signal, and the second amplitude detector is used for detecting the amplitudes of the voltage sampling signal and the current sampling signal; the first phase detector is used for detecting the phases of an initial current signal and an initial voltage signal, the second phase detector is used for detecting the phases of a voltage sampling signal and a current sampling signal, the output ends of the first amplitude detector, the first phase detector, the second amplitude detector and the second phase detector are all connected with a single chip microcomputer, and the single chip microcomputer is further connected with a display.
5. The multifunctional durability test device of the electric energy meter according to claim 3, characterized in that: the program-controlled power source cabinet is also internally provided with a PC (personal computer) and a serial server, the PC is connected with each direct digital synthesis signal source in the program-controlled power source, and the serial server is respectively connected with the standard electric energy meter and the electric energy meter to be tested in each test station; the serial server is also connected with a PC computer.
6. The multifunctional durability test device of the electric energy meter according to claim 1, characterized in that: the multifunctional durability test device further comprises a power amplifier power supply and a protection circuit, and the output end of the power amplifier power supply supplies power to the whole program-controlled power source cabinet after passing through the protection circuit.
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| CN202110411786.6A CN113030839A (en) | 2021-04-16 | 2021-04-16 | Multifunctional durability test device for electric energy meter |
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| CN202110411786.6A CN113030839A (en) | 2021-04-16 | 2021-04-16 | Multifunctional durability test device for electric energy meter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113866619A (en) * | 2021-09-18 | 2021-12-31 | 浙江省计量科学研究院 | Relay durability testing device and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113866619A (en) * | 2021-09-18 | 2021-12-31 | 浙江省计量科学研究院 | Relay durability testing device and method |
| CN113866619B (en) * | 2021-09-18 | 2024-01-30 | 浙江省计量科学研究院 | Relay durability testing device and method |
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