CN113030839B - A multifunctional durability test device for electric energy meters - Google Patents
A multifunctional durability test device for electric energy meters Download PDFInfo
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- CN113030839B CN113030839B CN202110411786.6A CN202110411786A CN113030839B CN 113030839 B CN113030839 B CN 113030839B CN 202110411786 A CN202110411786 A CN 202110411786A CN 113030839 B CN113030839 B CN 113030839B
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
本发明公开了一种电能表多功能耐久性试验装置，包括程控功率源机柜和多个电能表测试组件，所述程控功率源机柜分别与每一个电能表测试组件连接；所述电能表测试组件包括ICT电流变压器、PT变压器和多个测试工位；所述ICT电流变压器的输入端与程控功率源机柜的电流输出端连接，所述ICT电流变压器的输出端与每一个测试工位连接；所述PT变压器的输入端与程控功率源机柜的电压输出端连接，PT变压器的输出端与每一个测试工位连接。本发明提供的电能表多功能耐久性试验装置确保一台装置能够同时输出多种不同的电流值和电压值，满足了不同电流值和电压值的电能表试验要求。
The present invention discloses a multifunctional durability test device for electric energy meters, comprising 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 to each electric energy meter test component; the electric energy meter test component comprises an ICT current transformer, a PT transformer and a plurality of test stations; the input end of the ICT current transformer is connected to the current output end of the program-controlled power source cabinet, and the output end of the ICT current transformer is connected to each test station; the input end of the PT transformer is connected to the voltage output end of the program-controlled power source cabinet, and the output end of the PT transformer is connected to each test station. The multifunctional durability test device for electric energy meters provided by the present invention ensures that one device can output a variety of different current values and voltage values at the same time, meeting the test requirements of electric energy meters with different current values and voltage values.
Description
Technical Field
The invention relates to an electric energy meter test, in particular to a multifunctional durability test device for an electric energy meter.
Background
The durability test requires that the meter be placed in a temperature test chamber, warmed to the upper temperature specified by the meter, and held stable (typically 2 hours). The meter voltage circuit applies 1.1 times of nominal voltage (if a plurality of nominal voltages are available, the highest nominal voltage is taken), the current circuit is connected with the maximum current Imax, the power factor is 1, if the meter can simultaneously measure active electric energy and reactive electric energy, the power factor is 0.866L, and the test is continued for 1000 h under the test condition. And after the test is finished, the instrument is restored to the reference temperature, the error of the instrument is measured again, and the error deviation does not exceed the specified limit by comparing the inherent errors before and after the test. The application scene of the experimental device is mainly research and development tests and test of durability aging tests of the sample sending instrument.
The device requiring the durability test must have high stability and high reliability. Because the test process needs to continuously run for 1000 hours with Imax, and the device for the durability test in the process continuously records the electric energy and standard electric energy errors of the electric energy meter, the device for the durability test is required to have long-term stability, reliability and safety. The device can meet the electric energy phenotype evaluation test requirements of the same kind of the latest national network and the south network, and is compatible with the test requirements of the current electric energy meter.
Because the design of the existing electric energy meter calibrating device can only meet short-time test, the test can be completed within 24 hours as long as the test is needed, the design performance of the existing device is far from the 1000h operation requirement, and therefore, the device for the durability test needs to be newly designed.
The durability test is faced with the electric energy phenotype evaluation test of different factories, so that the electric energy meter test requirements of different current values can be met, the electric energy meter test device can only output one current and voltage each time, when multiple electric energy meter tests are simultaneously carried out, the other electric energy meter test can be carried out only after 1000 hours, and one or more durability test devices can not meet the test requirements for the electric energy meters with different voltages and current specifications.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides a multifunctional durability test device for an 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.
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 assemblies, wherein the program-controlled power source cabinet is respectively connected with each electric energy meter test assembly;
the electric energy meter testing component comprises an ICT current transformer, a PT transformer and a plurality of testing stations, wherein the input end of the ICT current transformer is connected with the current output end of the program-controlled power source cabinet, the output end of the ICT current transformer is connected with each testing 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 testing station.
Further, each electric energy meter test assembly's test station is n, all is provided with one electric energy meter that awaits measuring in each test station, and wherein, the electric energy meter that awaits measuring in the first test station is the leading meter, and the electric energy meter that awaits measuring in other test stations is the test meter.
The program-controlled power source comprises three signal generating channels, wherein signals output by the signal generating channels are transmitted to each electric energy meter testing component after passing through the electric energy meters;
the signal generation channel comprises a direct digital synthesis signal source, a feedback compensation adjustment circuit, a current power amplifier, a current booster, a voltage power amplifier, a booster, a standard current sampling module and a standard voltage sampling module, wherein 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 externally outputs the current signal, the standard current sampling module is used for sampling the output current and then obtaining a current sampling signal and feeding back the current sampling signal to the feedback compensation adjustment circuit, the initial voltage signal is externally output after passing through the voltage power amplifier and the booster, and the standard voltage sampling module is used for sampling the output voltage and then feeding back the voltage sampling signal to the feedback compensation adjustment 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 singlechip 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 system comprises a first amplitude detector, a second amplitude detector, a single chip microcomputer and a display, wherein the first amplitude detector is used for detecting the amplitude of an initial current signal and an initial voltage signal, the second amplitude detector is used for detecting the amplitude of the voltage sampling signal and the amplitude of the current sampling signal, the first phase detector is used for detecting the phase of the initial current signal and the phase of the initial voltage signal, the second phase detector is used for detecting the phase of the voltage sampling signal and the phase of the current sampling signal, and 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 the single chip microcomputer, and the single chip microcomputer is also connected with the display.
Further, a PC computer and a serial port server are further arranged in the program control power source cabinet, the PC computer is connected with each direct digital synthesis signal source in the program control power source, the serial port server is respectively connected with a standard electric energy meter and an electric energy meter to be tested in each test station, and the serial port server is further connected with the PC computer.
Further, the multifunctional durability test device further comprises a power amplification power supply and a protection circuit, wherein the output end of the power amplification power supply supplies power to the whole program-controlled power source cabinet after passing through the protection circuit.
The beneficial effects of the invention are as follows:
(1) The invention adopts the current and voltage conversion technology, can simultaneously output a plurality of different current and voltage values on one test, and meets the requirement of the simultaneous test of the electric energy meter with different current and voltage values.
(2) The invention can provide long-term stable power output of the power supply and ensure that the technical parameters for measurement can be effectively calibrated by tracing.
Drawings
FIG. 1 is a schematic diagram of the apparatus of the present invention;
FIG. 2 is a schematic block diagram of a programmable power source;
FIG. 3 is a schematic diagram of a feedback compensation adjusting circuit;
fig. 4 is a schematic diagram of the testing principle of the invention.
Detailed Description
The technical solution of the present invention will be described in further detail with reference to the accompanying drawings, but the scope of the present invention is not limited to the following description.
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 assemblies, wherein the program-controlled power source cabinet is respectively connected with each electric energy meter test assembly;
the electric energy meter testing component comprises an ICT current transformer, a PT transformer and a plurality of testing stations, wherein the input end of the ICT current transformer is connected with the current output end of the program-controlled power source cabinet, the output end of the ICT current transformer is connected with each testing 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 testing station.
In the embodiment of the application, n (n is 3 in fig. 1) test stations of each electric energy meter test assembly are provided, 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.
As shown in FIG. 2, the program-controlled power source comprises three signal generating channels, and the signals output by the signal generating channels are transmitted to each electric energy meter testing component after passing through the electric energy meters;
the signal generation channel comprises a direct digital synthesis signal source, a feedback compensation adjustment circuit, a current power amplifier, a current booster, a voltage power amplifier, a booster, a standard current sampling module and a standard voltage sampling module, wherein 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 externally outputs the current signal, the standard current sampling module is used for sampling the output current and then obtaining a current sampling signal and feeding back the current sampling signal to the feedback compensation adjustment circuit, the initial voltage signal is externally output after passing through the voltage power amplifier and the booster, and the standard voltage sampling module is used for sampling the output voltage and then feeding back the voltage sampling signal to the feedback compensation adjustment circuit.
In the embodiment of the present application, for the three-phase electric energy meter, a phase may be generated by each signal generating channel, for example, in fig. 2, the first signal generating channel generates a current signal Ia and a voltage signal Ua of the a phase, the second signal generating channel generates a current signal Ib and a voltage signal Ub of the B phase, and the third signal generating channel generates a current signal Ic and a voltage signal Uc of the C phase;
As shown in fig. 3, in an embodiment of the present application, the feedback compensation adjusting 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 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 amplitude of an initial current signal and an initial voltage signal, the second amplitude detector is used for detecting the amplitude of the voltage sampling signal and the amplitude of the current sampling signal, the first phase detector is used for detecting the phase of the initial current signal and the phase of the initial voltage signal, the second phase detector is used for detecting the phase of the voltage sampling signal and the phase of the current sampling signal, and the first amplitude detector, the first phase detector, the second amplitude detector and the second phase detector are used for transmitting the collected signals to a display for displaying through a singlechip. The method comprises the steps of judging whether the amplitude information of an initial current signal and the amplitude information of a sampling current signal are consistent or not through a first adjustable gain operational amplifier until the required amplification factor is achieved when the amplification requirement is not met, judging whether the phases of the initial current signal and the sampling current signal are consistent or not through the phase information of the initial current signal and the phase information of the sampling current signal, adjusting through a first adjustable phase shifter until the phases are consistent when the phases are inconsistent, judging whether the required voltage amplification factor is achieved or not through the amplitude of the initial voltage signal and the amplitude of the sampling voltage signal, and adjusting the amplitude of the voltage signal through a second adjustable gain amplifier until the required amplification factor is achieved when the requirement is not met by the staff. In other embodiments of the present application, the display may be omitted, the single-chip microcomputer automatically calculates the 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 the required amplification factor, the first adjustable gain operational amplifier and the second adjustable gain amplifier are automatically controlled according to the amplification factor to adjust the amplification factor until the required amplification factor is reached, the single-chip microcomputer may also automatically calculate the phase difference between the initial current signal and the sampling current signal, calculate the phase difference between the initial voltage signal and the sampling voltage signal, and adjust the first adjustable phase shifter and the second adjustable phase shifter according to the phase difference until the initial current signal and the sampling current signal are consistent, and the initial voltage signal and the sampling voltage signal are consistent in phase.
In the embodiment of the application, a PC computer and a serial port server are also arranged in the program-controlled power source cabinet, the PC computer is connected with each direct digital synthesis signal source in the program-controlled power source, and the serial port server is respectively connected with a standard electric energy meter and an electric energy meter to be tested in each test station.
In the embodiment of the application, the multifunctional durability test device further comprises a power amplifier power supply and a protection circuit, wherein the protection circuit can be a voltage stabilizing circuit, a power supply filter circuit and the like, in some embodiments, the protection circuit can also adopt smoke sensing and temperature detection technologies, the safety of the operation of the device can be ensured by rapidly cutting off a power supply when the durability test device is damaged, 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 cross flow ventilation technology can be added for the program-controlled power source cabinet, a cross flow fan is selected to extract cold air from the bottom of the cabinet in the 1000h operation process, the surface of a power tube of the electronic power amplifier is directly blown, the surface of the power tube is effectively cooled, hot air is extracted from the top of the cabinet to the outside of the cabinet, and thus the ventilation performance of the cabinet of the durability test device can be ensured, the temperature of the cabinet and the power amplifier can not be excessively 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, and the electric energy meter durability test device adopts a standard electric energy meter method direct comparison principle to carry out type test. The standard electric energy meter is used for carrying out power comparison in the test process, so that the real-time power of the electric energy meter can be monitored and compared in real time in the test process, and the effectiveness of the test and the traceability of electric parameters are ensured. The serial port server is used for communicating a PC with 485 channels such as a power source, an electric energy meter and the like, collecting data to a PC computer, and displaying and comparing the electric parameter data of the tested electric energy meter by a display connected with or provided by the PC computer, so that the electric parameter data can be conveniently and directly compared with a standard;
In embodiments of the present application, advanced direct digital synthesis signal techniques are employed. A powerful programmable digital logic array CPLD chip and a singlechip are used as cores to form a digital synthesized sinusoidal signal source, and a set point of a sinusoidal signal with a frequency range of 45.000 Hz-65.000 Hz and a phase of 0-360 DEG is preset. The digital quantity parameter of the sine signal is stored in a specific memory, a 3600 frequency-multiplied clock is used as a periodic addressing signal, the digital quantity sine signal parameter is taken out, after the digital quantity parameter is converted by a six-path digital-to-analog converter, a three-phase voltage and current sine signal is obtained, and then the three-phase voltage and current sine signal is subjected to active low-pass filtering to form a voltage and current sine signal with distortion degree less than 0.2%. The voltage and current signals output by the digital synthesized sine signal source are controllable in phase, amplitude, phase and frequency. The load point requirements for the verification of the electric energy meter can be realized by the control of a keyboard or a PC. The high stability direct current reference standard of the standard phase-locked loop circuit and the digital-to-analog converter ensures the long-term stability of the output sinusoidal signal.
The power amplifier adopts an AB type program-controlled electronic power amplifier, the electronic power source can reach 0.03% (@ 3 min), the stability and the accuracy of power output are ensured by using the program-controlled electronic power source, and the stable error monitoring in the durability test process is ensured;
In the embodiment of the application, the current signals Ia, ib and Ic generated by the program control power source cabinet are connected to the terminals of IAH, IBH and ICH of FIG. 4, the current flows through the ICT transformer to change 100A into 80A, 60A, 40A and other different current outputs, and then the current flows back to the program control power source cabinet through the IAL, IBL, ICL terminal of FIG. 4, each ICT can drive 1-n electric energy meters, and when the electric energy meters with different current types are required to be tested, multiple current electric energy meter tests can be simultaneously carried out.
The voltage signals Ua, ub and Uc generated by the program-controlled power source are connected to terminals of UA, UB and UC in FIG. 4, the PT transformer converts 220V into different voltage outputs of 100V, 57.7V and the like, each PT can drive 1-n electric energy meters, and when the electric energy meters of different voltage types are required to be tested, multiple voltage electric energy meter tests can be simultaneously carried out.
In the embodiment of the application, if the single-phase electric energy meter needs to be tested, the current signals and the voltage signals output by the program-controlled power personnel can be converted into single-phase signals and then the electric energy meter test can be carried out, and in the embodiment of the application, a plurality of groups of test stations can be additionally arranged, and the signals directly output by the program-controlled power source can be tested on a main loop of the program-controlled power source.
The invention has the working principle that the voltage and current standard sinusoidal signals generated by the direct digital synthesis signal source are respectively sent to a voltage power amplifier and a current power amplifier for power amplification through respective feedback compensation adjustment circuits. The amplified sine voltage signal is boosted by the voltage transformer and then sent to the calibrated meter and the standard electric energy meter, and the amplified current signal is sent to the calibrated meter and the standard electric energy meter after being boosted. The output voltage and current signals are fed back to the feedback compensation adjusting circuit of the power amplifier front stage through current and voltage feedback sampling, so that the output voltage and current signals have higher output stability and lower distortion; the invention adopts the current and voltage transformation (ICT, PT transformer) technology, can output a plurality of different current and voltage values on one test at the same time, and meets the requirement of the simultaneous test of the electric energy meters with different current and voltage values.
While the foregoing description illustrates and describes a preferred embodiment of the present invention, it is to be understood that the invention is not limited to the form disclosed herein, but is not to be construed as limited to other embodiments, but is capable of use in various other combinations, modifications and environments and is capable of changes or modifications within the spirit of the invention described herein, either as a result of the foregoing teachings or as a result of the knowledge or skill of the relevant art. And that modifications and variations which do not depart from the spirit and scope of the invention are intended to be within the scope of the appended claims.
Claims (3)
1. The multifunctional durability test device for the electric energy meter is characterized by comprising a program-controlled power source cabinet and a plurality of electric energy meter test assemblies, wherein the program-controlled power source cabinet is respectively connected with each electric energy meter test assembly;
The electric energy meter testing component comprises an ICT current transformer, a PT transformer and a plurality of testing stations, wherein 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 testing station;
The number of the test stations of each electric energy meter test assembly is n, 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 the other test stations are test meters;
The program control power source comprises three signal generating channels, wherein the signals output by the signal generating channels are transmitted to each electric energy meter testing component after passing through the electric energy meter;
The signal generation channel comprises a direct digital synthesis signal source, a feedback compensation adjustment circuit, a current power amplifier, a current booster, a voltage power amplifier, a booster, a standard current sampling module and a standard voltage sampling module, wherein 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 externally outputs the current signal, the standard current sampling module is used for sampling the output current and then obtaining a current sampling signal and feeding back the current sampling signal to the feedback compensation adjustment 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 singlechip 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 system comprises a first amplitude detector, a second amplitude detector, a single chip microcomputer, a first phase detector, a second phase detector and a display, wherein the first amplitude detector is used for detecting the amplitude of an initial current signal and an initial voltage signal, the second amplitude detector is used for detecting the amplitude of the voltage sampling signal and the amplitude of the current sampling signal, the first phase detector is used for detecting the phase of the initial current signal and the phase of the initial voltage signal, the second phase detector is used for detecting the phase of the voltage sampling signal and the phase of the 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 the single chip microcomputer, and the single chip microcomputer is also connected with the display;
The first amplitude detector, the first phase detector, the second amplitude detector and the second phase detector transmit collected signals to the display for display through the singlechip, the singlechip automatically calculates the amplification factor from an initial current signal to a sampling current signal, the amplification factor from the initial voltage signal to the sampling voltage signal is automatically compared with the required amplification factor, 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, the phase difference between the initial current signal and the sampling current signal is automatically calculated by the singlechip, the phase difference between the initial voltage signal and the sampling voltage signal is calculated, and the first adjustable phase shifter and the second adjustable phase shifter are adjusted according to the phase difference until the initial current signal is consistent with the sampling current signal, and the phase of the initial voltage signal is consistent with the phase of the sampling voltage signal.
2. The multifunctional durability test device for the electric energy meter according to claim 1, wherein a PC (personal computer) and a serial port 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, the serial port server is respectively connected with a standard electric energy meter and an electric energy meter to be tested in each test station, and the serial port server is further connected with the PC.
3. The multifunctional durability test device of the electric energy meter according to claim 1, wherein the multifunctional durability test device further comprises a power amplification power supply and a protection circuit, and the output end of the power amplification power supply supplies power to the whole program-controlled power source cabinet after passing through the protection circuit.
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| CN102353926A (en) * | 2011-07-13 | 2012-02-15 | 北京北研兴电力仪表有限责任公司 | Electric energy metering simulation operation test method and device |
| CN215180830U (en) * | 2021-04-16 | 2021-12-14 | 广东省计量科学研究院（华南国家计量测试中心） | Multifunctional durability test device for electric energy meter |
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| US10545182B2 (en) * | 2016-03-17 | 2020-01-28 | Texas Instruments Incorporated | Crosstalk calibration for multi-channel systems |
| CN110297206B (en) * | 2019-06-06 | 2021-06-25 | 国网浙江省电力有限公司营销服务中心 | Three-phase electric energy meter verification device power source based on IR46 standard |
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| CN102353926A (en) * | 2011-07-13 | 2012-02-15 | 北京北研兴电力仪表有限责任公司 | Electric energy metering simulation operation test method and device |
| CN215180830U (en) * | 2021-04-16 | 2021-12-14 | 广东省计量科学研究院（华南国家计量测试中心） | Multifunctional durability test device for electric energy meter |
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