CN101982792B - Test system and method for measurement error and EMS frequency automatic matching of intelligent electric energy meter - Google Patents
Test system and method for measurement error and EMS frequency automatic matching of intelligent electric energy meter Download PDFInfo
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Abstract
The invention discloses a test system and method for measurement error and EMS frequency automatic matching of an intelligent electric energy meter. In a transmission immunity test of radio frequency field induction, the test system comprises a main control computer, a radio frequency signal generator, a coupling/decoupling network, a communication system, an electric energy meter to be tested and an electric energy meter detection device; and in a radiation immunity test of a radio frequency electromagnetic field, the test system comprises the main control computer, the radio frequency signal generator, a power amplifier, the communication system, a transmitting antenna, the electric energy meter to be tested and the electric energy meter detection device. In the method, a new algorithm is adopted to solve the problems of measurement error and EMS frequency automatic matching involved in the processes of the transmission immunity test of the radio frequency field induction and the radiation immunity test of the radio frequency electromagnetic field in the electromagnetic compatibility of the electric energy meter. The method is simple and practicable, expended fund is less and the accuracy degree of measurement data can be improved.
Description
Technical field
The present invention relates to a kind of intelligent electric energy meter error in dipping and EMS frequency Auto-matching test macro and method, belong to the system and method that solves metering instrument error and EMS frequency matching problem.
Background technology
Intelligent electric energy meter is the instrument for electric energy metrical.Intelligent electric energy meter adopts the multiplier realization to the measurement of electric power, tested high voltage, large electric current are delivered to multiplier and are completed the voltage and current instantaneous value and multiply each other after voltage changer and power pack conversion, export one to a period of time in the DC voltage that is directly proportional of average power, and then utilize electric voltage/frequency converter, DC voltage is converted into the pulsed frequency that is proportional to average power, with this frequency division of the frequency, and by counter the technology within a period of time, demonstrate corresponding electric energy.Intelligent electric energy meter also has usually with/without functions such as merit measurement, network remote-transmission, data analysis.
An important indicator in the intelligent electric energy meter quality assessment is electromagnetic immunity (EMS) standard, and the EMS test of this standard code mainly comprises conduction interference immunity to interference, the attenuation oscillasion impulse immunity to interference of esd immunity, radio frequency electromagnetic field immunity to interference, Clusters immunity to interference, surge immunity, radio-frequency field induction.After wherein needing to adopt the sine wave of 1kHz signal to be carried out 80% amplitude modulation(PAM) in this two EMS test of the conduction interference immunity to interference of radio frequency electromagnetic field immunity to interference and radio-frequency field induction, carry out frequency sweep in 80MHz-2000MHz (radio frequency electromagnetic field immunity to interference) and 150kHz-80MHz (the conduction interference immunity to interference that radio-frequency field is responded to) frequency range.If frequency sweep is carried out in a stepwise manner, stepping amplitude should be no more than 1% of last frequency, finds as far as possible the sensitive frequency point.Residence time should be no less than instrument function operation and fundamental error test required time.Frequency sweep also can adopt linear mode.
Because this test request need to keep injecting the undesired signal that frequency is known to tested electric energy meter, this frequency signal should carry out error testing again after resident certain hour on equipment under test simultaneously, thereby guarantees the stability of the error result that test is arrived.Therefore residence time how to guarantee undesired signal becomes an important ring in electromagnetic compatibility test with the precision of guaranteeing test result.
Be mainly to utilize operating personnel's manual counting to this way to solve the problem, the method is labor intensive not only, the problems such as error of omission, incorrect posting easily occur simultaneously in the past; Thereby perhaps reach the automatic record of error information by the artificial setting signal generator output signal length of holding time, the method needs stronger engineering experience, when signal is held time when longer, make Measuring Time elongated, affect work efficiency, when Measuring Time was too short, the parked time of undesired signal can't be satisfied the testing standard requirement, made test data can not react preferably tested electric energy meter characteristic.Simultaneously, these methods all carry out recording in the one-shot measurement situation to this frequency, and measurement data is prone to gross error, therefore the authenticity of this measurement data is doubtful.
patent of the present invention proposes a kind of novel electric energy meter error and EMS frequency Auto-matching test macro, utilize this system can be at the electric energy meter comprehensive test macro that has proposed at present (comprising a patent of having accepted, the patent number of accepting: 200910153723), a kind of new electric energy Watch Error and EMS frequency Auto-matching test macro are applied to wherein, can fully solve in integrated test system error amount can't with the problem of EMS frequency Auto-matching, can gather a plurality of error informations at a frequency simultaneously, by rejecting gross error, be averaging to eliminate the error of single measurement.
Summary of the invention
The present invention utilizes error in dipping and EMS frequency matching problem related in the conducted immunity test of the induction of the radio-frequency field in electric energy meter electromagnetism compatibility and radio frequency electromagnetic field immunity to interference test process is proposed a solution.Adopt this scheme can effectively solve the problem of the compatible error in dipping data field of electrical energy meter electricity magnetic EMS frequency matching.
The present invention adopts following technical scheme for achieving the above object:
Intelligent electric energy meter error in dipping of the present invention and EMS frequency Auto-matching test macro is characterized in that comprising:
In the conducted immunity test of radio-frequency field induction, described test macro comprises main control computer, radio-frequency signal generator, coupling/decoupling network, communication system, tested electric energy meter and calibrator for watt-hour meter, wherein main control computer is connected with calibrator for watt-hour meter with radio-frequency signal generator respectively by communication system, radio-frequency signal generator is connected with tested electric energy meter by coupling/decoupling network, and tested electric energy meter is connected with the input end of calibrator for watt-hour meter;
In the radio frequency electromagnetic field radiation immunity test, described test macro comprises main control computer, radio-frequency signal generator, power amplifier, communication system, emitting antenna, tested electric energy meter and calibrator for watt-hour meter, wherein main control computer is connected with radio-frequency signal generator, power amplifier and calibrator for watt-hour meter respectively by communication system, radio-frequency signal generator is connected with emitting antenna by power amplifier, in emitting antenna setting corresponding to tested electric energy meter and anechoic chamber.
Preferably, described in the conducted immunity test of radio-frequency field induction, tested electric energy meter and calibrator for watt-hour meter bottom all arrange support, the high 0.1m of described support.
Preferably, described in the radio frequency electromagnetic field radiation immunity test, described anechoic chamber, surrounding arranges the ripple absorbing material.
Preferably, described in the radio frequency electromagnetic field radiation immunity test, emitting antenna and tested electric energy meter are at a distance of 3m.
Preferably, described in the radio frequency electromagnetic field radiation immunity test, tested electric energy meter is apart from anechoic chamber, bottom 0.8m.
Preferably, described communication system is the instrument communication bus.
The method of testing of intelligent electric energy meter error in dipping and EMS frequency Auto-matching test macro is as follows:
In the conducted immunity test of radio frequency induction, comprise the steps:
1) main control computer sends to radio-frequency signal generator with the Frequency point of required measurement by communication system, notifies simultaneously the decision-making system in main control computer to judge that the link signal changes; The Frequency point signal that signal generator is adjusted required emission is coupled in tested electric energy meter by coupling/decoupling network, as the simulation conducted electromagnetic interference noise of electric energy meter;
2) tested electric energy meter under the undesired signal effect, periodically produces error in dipping;
3) calibrator for watt-hour meter sends the error information in one-period to main control computer;
4) notify by communication system at main control computer on the decision-making system radio-frequency signal generator basis that frequency has changed, decision-making system is given up first data that calibrator for watt-hour meter sends, and transmits a subsequent n-1 data to main control computer;
5) main control computer by after this n-1 data are averaged, draws the error information of tested electric energy meter radio frequency induction conducted immunity under this frequency;
6) main control computer changes required measurement frequency and sends to radio-frequency signal generator by communication system, and repeating step 1～6 is until all frequencies are measured end, and wherein n is the natural number greater than 2;
In the radio frequency electromagnetic field radiation immunity test, comprise the steps:
A) main control computer sends to radio-frequency signal generator with the Frequency point of required measurement by communication system, notifies simultaneously the decision-making system in main control computer to judge that the link signal changes; The Frequency point that signal generator is adjusted required emission is sent to power amplifier, and the signal after amplification transfers to emitting antenna and in anechoic chamber,, tested electric energy meter disturbed, and this disturbs the simulation conducted electromagnetic interference noise as electric energy meter;
B) tested electric energy meter under the undesired signal effect, periodically produces error in dipping;
C) calibrator for watt-hour meter sends the error information in one-period to main control computer;
D) notify by communication system at main control computer on the decision-making system radio-frequency signal generator basis that frequency has changed, decision-making system is given up first data that calibrator for watt-hour meter sends, and transmits a subsequent n-1 data to main control computer;
E) main control computer by after this n-1 data are averaged, can draw the error information of tested electric energy meter radio frequency electromagnetic field radiation immunity under this frequency;
F) main control computer changes required measurement frequency and sends to radio-frequency signal generator by communication system, and repeating step 1～6 is until all frequencies are measured end, and wherein n is the natural number greater than 2.
The present invention utilizes this system can effectively solve the problem of error information and EMS frequency Auto-matching in the electric energy meter metering process, make intelligent electric energy meter in metering process its error in dipping and the EMS frequency matching more accurate, and can improve accuracy and the measuring speed of measurement data.
Description of drawings
Fig. 1: error signal and EMS Frequency point matching algorithm process flow diagram;
Fig. 2: the Conduction Interference immunity to interference test philosophy figure of radio-frequency field induction;
Fig. 3: radio frequency electromagnetic field radiation immunity test philosophy figure, this test experiments should be placed on emitting antenna, tested electric energy meter in the 3m darkroom.
Embodiment
Below in conjunction with drawings and Examples, as an example of radio frequency electromagnetic field radiation immunity example, the present invention is described in further detail.
As illustrated in fig. 1 and 2, intelligent electric energy meter error in dipping of the present invention and EMS frequency Auto-matching test macro comprise:
In the conducted immunity test of radio-frequency field induction, described test macro comprises main control computer, radio-frequency signal generator, coupling/decoupling network, communication system, tested electric energy meter and calibrator for watt-hour meter, wherein main control computer is connected with calibrator for watt-hour meter with radio-frequency signal generator respectively by communication system, radio-frequency signal generator is connected with tested electric energy meter by coupling/decoupling network, and tested electric energy meter is connected with the input end of calibrator for watt-hour meter;
In the radio frequency electromagnetic field radiation immunity test, described test macro comprises main control computer, radio-frequency signal generator, power amplifier, communication system, emitting antenna, tested electric energy meter and calibrator for watt-hour meter, wherein main control computer is connected with radio-frequency signal generator, power amplifier and calibrator for watt-hour meter respectively by communication system, radio-frequency signal generator is connected with emitting antenna by power amplifier, in emitting antenna setting corresponding to tested electric energy meter and anechoic chamber.
Preferably, described in the conducted immunity test of radio-frequency field induction, tested electric energy meter and calibrator for watt-hour meter bottom all arrange support, the high 0.1m of described support.
Preferably, described in the radio frequency electromagnetic field radiation immunity test, described anechoic chamber, surrounding arranges the ripple absorbing material.
Preferably, described in the radio frequency electromagnetic field radiation immunity test, emitting antenna and tested electric energy meter are at a distance of 3m.
Preferably, described in the radio frequency electromagnetic field radiation immunity test, tested electric energy meter is apart from anechoic chamber, bottom 0.8m.
Preferably, described communication system is the instrument communication bus.
As shown in Figure 3, the method for testing of intelligent electric energy meter error in dipping and EMS frequency Auto-matching test macro is as follows:
In the conducted immunity test of radio frequency induction, comprise the steps:
1) main control computer sends to radio-frequency signal generator with the Frequency point of required measurement by communication system, notifies simultaneously the decision-making system in main control computer to judge that the link signal changes; The Frequency point signal that signal generator is adjusted required emission is coupled in tested electric energy meter by coupling/decoupling network, as the simulation conducted electromagnetic interference noise of electric energy meter;
2) tested electric energy meter under the undesired signal effect, periodically produces error in dipping;
3) calibrator for watt-hour meter is put at a fixed time, sends the error information in one-period to main control computer;
4) notify by communication system at main control computer on the decision-making system radio-frequency signal generator basis that frequency has changed, decision-making system is given up first data that calibrator for watt-hour meter sends, and transmits a subsequent n-1 data to main control computer;
5) main control computer by after this n-1 data are averaged, draws the error information of tested electric energy meter radio frequency induction conducted immunity under this frequency;
6) main control computer changes required measurement frequency and sends to radio-frequency signal generator by communication system, and repeating step 1～6 is until all frequencies are measured end, and wherein n is the natural number greater than 2;
In the radio frequency electromagnetic field radiation immunity test, comprise the steps:
A) main control computer sends to radio-frequency signal generator with the Frequency point of required measurement by communication system, notifies simultaneously the decision-making system in main control computer to judge that the link signal changes; The Frequency point that signal generator is adjusted required emission is sent to power amplifier, and the signal after amplification transfers to emitting antenna and in anechoic chamber,, tested electric energy meter disturbed, and this disturbs the simulation conducted electromagnetic interference noise as electric energy meter;
B) tested electric energy meter under the undesired signal effect, periodically produces error in dipping;
C) calibrator for watt-hour meter is put at a fixed time, sends the error information in one-period to main control computer;
D) notify by communication system at main control computer on the decision-making system radio-frequency signal generator basis that frequency has changed, decision-making system is given up first data that calibrator for watt-hour meter sends, and transmits a subsequent n-1 data to main control computer;
E) main control computer by after this n-1 data are averaged, can draw the error information of tested electric energy meter radio frequency electromagnetic field radiation immunity under this frequency;
F) main control computer changes required measurement frequency and sends to radio-frequency signal generator by communication system, and repeating step 1～6 is until all frequencies are measured end, and wherein n is the natural number greater than 2.
Embodiment
Detecting instrument address (the general communication bus of using has RS-232, GPIB, LAN etc.) at first is set, confirms that instrument is in program control (remote) state, can accept host computer and control;
Then the parameter of tested electric energy meter is set, comprises: rated voltage, fundamental current, electric energy constant, instrument grade, the number of turns etc.;
Click the lower right side START button, system begins test automatically, and at first system measures the error of electric energy meter when not applying the EMS interference automatically, as the initial error data.Detection system software as initial point, arranges its positive and negative error margin to this initial error according to the electric energy meter grade, after the EMS interference applies, if Real-time Error surpasses this tolerance limit when the time comes, namely is considered as electric energy meter EMS performance inconsistency lattice on this Frequency point.
System software first arranges detecting instrument, send the information such as EMS frequency, electric energy meter is applied the undesired signal of certain frequency, gather the electric energy meter error data this moment, because the electric energy meter error data are periodic datas, for guaranteeing that certain measurement point error information has at least in the complete interference that drops on certain Frequency point of n-1 cycle, therefore give up first error information, adopt a back n-1 error information, in other words continuous acquisition n data, and a rear n-1 data are averaged as the error amount of electric energy meter on certain EMS interfering frequency point.
At last, the lower error information of the different frequency point shown according to system interface judges that this tested electric energy meter performance is good and bad.
Claims (6)
1. the method for testing of an intelligent electric energy meter error in dipping and EMS frequency Auto-matching test macro, is characterized in that,
In the conducted immunity test of radio-frequency field induction, described test macro comprises main control computer, radio-frequency signal generator, coupling/decoupling network, communication system, tested electric energy meter and calibrator for watt-hour meter, wherein main control computer is connected with calibrator for watt-hour meter with radio-frequency signal generator respectively by communication system, radio-frequency signal generator is connected with tested electric energy meter by coupling/decoupling network, and tested electric energy meter is connected with the input end of calibrator for watt-hour meter;
In the radio frequency electromagnetic field radiation immunity test, described test macro comprises main control computer, radio-frequency signal generator, power amplifier, communication system, emitting antenna, tested electric energy meter and calibrator for watt-hour meter, wherein main control computer is connected with radio-frequency signal generator, power amplifier and calibrator for watt-hour meter respectively by communication system, radio-frequency signal generator is connected with emitting antenna by power amplifier, in emitting antenna setting corresponding to tested electric energy meter and anechoic chamber;
In the conducted immunity test of radio frequency induction, comprise the steps:
1) main control computer sends to radio-frequency signal generator with the Frequency point of required measurement by communication system, notifies simultaneously the decision-making system in main control computer to judge that the link signal changes; The Frequency point signal that radio-frequency signal generator is adjusted required emission is coupled in tested electric energy meter by coupling/decoupling network, as the simulation conducted electromagnetic interference noise of electric energy meter;
2) tested electric energy meter under the undesired signal effect, periodically produces error in dipping;
3) calibrator for watt-hour meter sends the error information in one-period to main control computer;
4) notify by communication system at main control computer on the decision-making system radio-frequency signal generator basis that frequency has changed, decision-making system is given up first data that calibrator for watt-hour meter sends, and transmits a subsequent n-1 data to main control computer;
5) main control computer by after this n-1 data are averaged, draws the error information of tested electric energy meter radio frequency induction conducted immunity under this frequency;
6) main control computer changes required measurement frequency and sends to radio-frequency signal generator by communication system, and repeating step 1～6 is until all frequencies are measured end, and wherein n is the natural number greater than 2;
In the radio frequency electromagnetic field radiation immunity test, comprise the steps:
A) main control computer sends to radio-frequency signal generator with the Frequency point of required measurement by communication system, notifies simultaneously the decision-making system in main control computer to judge that the link signal changes; The Frequency point that radio-frequency signal generator is adjusted required emission is sent to power amplifier, and the signal after amplification transfers to emitting antenna and in anechoic chamber,, tested electric energy meter disturbed, and this disturbs the simulation conducted electromagnetic interference noise as electric energy meter;
B) tested electric energy meter under the undesired signal effect, periodically produces error in dipping;
C) calibrator for watt-hour meter sends the error information in one-period to main control computer;
D) notify by communication system at main control computer on the decision-making system radio-frequency signal generator basis that frequency has changed, decision-making system is given up first data that calibrator for watt-hour meter sends, and transmits a subsequent n-1 data to main control computer;
E) main control computer by after this n-1 data are averaged, can draw the error information of tested electric energy meter radio frequency electromagnetic field radiation immunity under this frequency;
F) main control computer changes required measurement frequency and sends to radio-frequency signal generator by communication system, and repeating step a～f is until all frequencies are measured end, and wherein n is the natural number greater than 2.
2. the method for testing of intelligent electric energy meter error in dipping according to claim 1 and EMS frequency Auto-matching test macro, it is characterized in that: in the conducted immunity test of described radio-frequency field induction, support, the high 0.1m of described support all are set bottom tested electric energy meter and calibrator for watt-hour meter.
3. the method for testing of intelligent electric energy meter error in dipping according to claim 1 and EMS frequency Auto-matching test macro is characterized in that: in described radio frequency electromagnetic field radiation immunity test, described anechoic chamber, surrounding arranges the ripple absorbing material.
4. the method for testing of intelligent electric energy meter error in dipping according to claim 1 and EMS frequency Auto-matching test macro is characterized in that: in described radio frequency electromagnetic field radiation immunity test, emitting antenna and tested electric energy meter be 3m apart.
5. the method for testing of intelligent electric energy meter error in dipping according to claim 1 and EMS frequency Auto-matching test macro is characterized in that: in described radio frequency electromagnetic field radiation immunity test, tested electric energy meter is apart from anechoic chamber, bottom 0.8m.
6. the method for testing of intelligent electric energy meter error in dipping according to claim 1 and EMS frequency Auto-matching test macro, it is characterized in that: described communication system is the instrument communication bus.
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| CN106707223A (en) * | 2017-02-22 | 2017-05-24 | 国网上海市电力公司 | Electric energy meter electromagnetic compatibility immunity automatic test system |
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| CN108919019A (en) * | 2018-09-28 | 2018-11-30 | 国网辽宁省电力有限公司电力科学研究院 | A kind of Application of Power Metering Instruments electromagnetic compatibility test system |
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| CN113259025B (en) * | 2021-04-08 | 2023-03-21 | 中国电子科技集团公司第二十九研究所 | Calibration system and method for broadband radio frequency receiving device |
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