CN104569904A - Test device for testing direct current and even harmonic influence quantity of electric energy meter - Google Patents
Test device for testing direct current and even harmonic influence quantity of electric energy meter Download PDFInfo
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- CN104569904A CN104569904A CN201410796674.7A CN201410796674A CN104569904A CN 104569904 A CN104569904 A CN 104569904A CN 201410796674 A CN201410796674 A CN 201410796674A CN 104569904 A CN104569904 A CN 104569904A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
Abstract
The invention provides a test device for testing the direct current and even harmonic influence quantity of an electric energy meter. The test device is characterized by comprising the electric energy meter, an electric energy meter calibrating device for testing the electric energy metering precision of the electric energy meter and a direct-current current source for outputting direct-current current from a current loop of the electric energy meter, wherein a voltage loop and the current loop of the electric energy meter are connected with a voltage loop and a current loop of the electric energy meter calibrating device, the electric energy pulse output of the electric energy meter is connected to the electric energy pulse test input end of the electric energy meter calibrating device, the output positive end of the direct-current current source is connected to the current leading-out wire end of the current loop of the electric energy meter, the output negative end of the direct-current current source is connected to the current incoming wire end of the current loop of the electric energy meter, and the test of the direct current and even harmonic influence quantity of the electric energy meter can be finished without dividing the current test loop into two current branches. Two diodes and one balanced impeder in the current test loop are omitted.
Description
Technical field
The present invention relates to electric energy measurement technical field, particularly relate to and a kind ofly test the direct current of electric energy meter and the test unit of even-order harmonic influence amount.
Background technology
In electric system, due to a large amount of uses of power electronic devices, the particularly use of half-wave rectification equipment, make to occur half-wave current with in electric line, produce direct current measurement component, and when having DC current in the current return of electric energy meter, the magnetic property of the magnetic core of the electromagnetic current transducer of electric energy meter can be changed, even saturated, thus make the electromagnetic current transducer of electric energy meter not carry out Measurement accuracy, affect the accuracy of electric energy meter electric energy metrical, therefore, the electromagnetic current transducer in electric energy meter is needed to have the ability of anti-DC component, also need to test the direct current of electric energy meter and the test unit of even-order harmonic influence amount simultaneously.
In the measurement standard GB/T 17215.321-2008 " alternating current measuring equipment particular/special requirement the 21st part: state type active electric energy meter (1 grade and 2 grades) " of electric energy meter, to the electric energy meter of direct access, electric current input circuit is under the condition of half-wave current input, require that the limit of the knots modification of the electric energy metering error of electric energy meter is no more than 3%, the test circuit of the direct current of electric energy meter and even-order harmonic influence amount is tested as shown in Figure 1 in the measurement standard GB/T17215.321-2008 of electric energy meter, current return is divided into two branch roads by two diodes by testing program, the alternating current of current return is made to be divided into positive half-wave and negative half-wave, one of them branch road is connected to electric energy meter, another one branch road increases a balanced load, electric current positive half-wave passes through electric energy meter, for reducing to affect measurement result due to the laod unbalance of two current branch, balanced load adopts same producer usually, same batch and electric energy meter of the same period, in addition, for improving equilibrium condition, a resistance RB is also add in two branch roads, its resistance is 10 times of electric energy meter current loop resistance values, in theory, the electric flux obtained measured by electric energy meter is the half of the electric flux that standard electric energy meter measurement obtains, direct current and the even-order harmonic influence amount of electric energy meter is tested with this.
Chinese patent CN103675749A provides one " electric energy meter direct current and even-order harmonic state under device for detecting performance ", as shown in Figure 2, comprise the first commutation diode, second commutation diode, a balanced impedance load, a standard electric energy meter, electric energy meter and single-chip microcomputer, the forward current of standard electric energy meter exports the current input terminal accessing electric energy meter after the first rectifies, the inverse current of standard electric energy meter exports after the current input terminal of balanced impedance load, accesses the second rectifies negative terminal, the impedance of two current branch is equal, balanced impedance load adopts same producer usually, same batch and electric energy meter of the same period, the metric results of standard electric energy meter and electric energy meter exports single-chip microcomputer to and compares.Due to 2 times that the electric flux flowing through standard electric energy meter is the electric flux flowing through electric energy meter, therefore usually the calibrating meter constant of standard electric energy meter is set to 1/2 of the meter constant of electric energy meter to test direct current and the even-order harmonic influence amount of electric energy meter when examining and determine.
In existing measuring technique scheme, in order to test direct current and the even-order harmonic influence amount of electric energy meter, need current measurement circuit to be divided into two current branch, and do not affect by two branch circuit load are unbalanced to make measurement result, require that the impedance of two current branch is equal, thus add the test direct current of electric energy meter and the complexity of even-order harmonic influence amount.
Summary of the invention
The object of the invention is to: provide a kind of and test the direct current of electric energy meter and the test unit of even-order harmonic influence amount, do not need current measurement circuit to be divided into the test that two current branch can complete direct current to electric energy meter and even-order harmonic influence amount.
The technical solution adopted in the present invention is: a kind ofly test the direct current of electric energy meter and the test unit of even-order harmonic influence amount, it is characterized in that: comprise an electric energy meter, one for testing the electric energy meter checking device of the electric energy metrical accuracy of electric energy meter, one for exporting the DC current source of DC current to the current return of electric energy meter, voltage circuit and the current return of the voltage circuit of electric energy meter and current return and electric energy meter checking device are connected, the electrical energy pulse of electric energy meter exports the electrical energy pulse test input being connected to electric energy meter checking device, the output plus terminal of DC current source is connected to the electric current end of incoming cables of the current return of electric energy meter, the output negative terminal of DC current source is connected to the current outlet end of the current return of electric energy meter, as shown in Figure 3.The programmable AC power supply that the controller of electric energy meter checking device controls electric energy meter checking device exports virtual load to the standard electric energy meter of electric energy meter checking device and electric energy meter, the standard electric energy meter of electric energy meter checking device measure programmable AC power supply export virtual load and outputting standard electrical energy pulse to the controller of electric energy meter checking device, electric energy meter electric energy meter is measured programmable AC power supply and is exported virtual load and export the controller of electrical energy pulse to electric energy meter checking device, the electrical energy pulse that electric energy meter exports by the controller of electric energy meter checking device and the standard electric energy impulse that standard electric energy meter exports contrast, and then obtain the electric energy metering error of electric energy meter, DC current source exports the current return of DC current to electric energy meter, obtain the half-wave current synthesized at the current return of electric energy meter after the first-harmonic exported by the DC current that DC current source exported and electric energy meter checking device and even-order harmonic electric current carry out Waveform composition, thus measure direct current and the even-order harmonic influence amount of electric energy meter.
Another technical scheme of the present invention is: a kind ofly test the direct current of electric energy meter and the test unit of even-order harmonic influence amount, it is characterized in that: comprise an electric energy meter, one for testing the electric energy meter checking device of the electric energy metrical accuracy of electric energy meter, one for exporting the DC current source of DC current to the current return of electric energy meter, voltage circuit and the current return of the voltage circuit of electric energy meter and current return and electric energy meter checking device are connected, the electrical energy pulse of electric energy meter exports the electrical energy pulse test input being connected to electric energy meter checking device, the output plus terminal of DC current source is connected to the current outlet end of the current return of electric energy meter, the output negative terminal of DC current source is connected to the electric current end of incoming cables of the current return of electric energy meter, as shown in Figure 4.The programmable AC power supply that the controller of electric energy meter checking device controls electric energy meter checking device exports virtual load to the standard electric energy meter of electric energy meter checking device and electric energy meter, the standard electric energy meter of electric energy meter checking device measure programmable AC power supply export virtual load and outputting standard electrical energy pulse to the controller of electric energy meter checking device, electric energy meter electric energy meter is measured programmable AC power supply and is exported virtual load and export the controller of electrical energy pulse to electric energy meter checking device, the electrical energy pulse that electric energy meter exports by the controller of electric energy meter checking device and the standard electric energy impulse that standard electric energy meter exports contrast, and then obtain the electric energy metering error of electric energy meter, DC current source exports the current return of DC current to electric energy meter, obtain the half-wave current synthesized at the current return of electric energy meter after the first-harmonic exported by the DC current that DC current source exported and electric energy meter checking device and even-order harmonic electric current carry out Waveform composition, thus measure direct current and the even-order harmonic influence amount of electric energy meter.
The invention has the beneficial effects as follows: provide a kind of and test the direct current of electric energy meter and the test unit of even-order harmonic influence amount, do not need current measurement circuit to be divided into the test that two current branch can complete direct current to electric energy meter and even-order harmonic influence amount, save two diodes in current measurement circuit and a balanced impedance.
Figure of description explanation
Fig. 1 is the test circuit figure in measurement standard GB/T 17215.321-2008
Fig. 2 is the measuring principle figure of Chinese patent CN103675749A
Fig. 3 is the measuring principle figure of embodiments of the invention 1
Fig. 4 is the measuring principle figure of embodiments of the invention 2
Embodiment
Below in conjunction with embodiment, concrete elaboration is made to the present invention;
Embodiment 1
The test philosophy figure of electric current positive half-wave influence amount test as shown in Figure 3, a kind ofly test the direct current of electric energy meter and the test unit of even-order harmonic influence amount, comprise an electric energy meter, one for testing the electric energy meter checking device of the electric energy metrical accuracy of electric energy meter, one for exporting the DC current source of DC current to the current return of electric energy meter, voltage circuit and the current return of the voltage circuit of electric energy meter and current return and electric energy meter checking device are connected, the electrical energy pulse output terminal Test of electric energy meter is connected to the electrical energy pulse test input Test of electric energy meter checking device, the output plus terminal (I+) of DC current source is connected to the electric current end of incoming cables of the current return of electric energy meter, the output negative terminal (I-) of DC current source is connected to the current outlet end of the current return of electric energy meter.
First, the magnitude of voltage of the programmable AC power supply output fundamental voltage of the controller control electric energy meter checking device of electric energy meter checking device is the load voltage value of electric energy meter, the current value of the programmable AC power supply output fundamental current of the controller control electric energy meter checking device of electric energy meter checking device is the maximum current value of electric energy meter, then measures the accuracy of measuring of electric energy meter.
Secondly, the magnitude of voltage of the programmable AC power supply output fundamental voltage of the controller control electric energy meter checking device of electric energy meter checking device is the load voltage value of electric energy meter, the current value of the programmable AC power supply output fundamental current of the controller control electric energy meter checking device of electric energy meter checking device is 1/2 of the maximum current value of electric energy meter, the even-order harmonic electric current content that electric energy meter checking device exports is: 2 subharmonic current content are 42.44%, 4 subharmonic current content are 8.49%, 6 subharmonic current content are 3.64%, 8 subharmonic current content are 2.02%, 10 subharmonic current content are 1.28%, 12 subharmonic current content are 0.89%, 14 subharmonic current content are 0.65%, 16 subharmonic current content are 0.49%, 18 subharmonic current content are 0.39%, 20 subharmonic current content are 0.32%, the DC current values that DC current source exports is 31.83% of the maximum current of electric energy meter, like this, the half-wave current that an effective value is the maximum current of electric energy meter is obtained at the circuit loop of electric energy meter, the accuracy of measuring of electric energy meter is measured by electric energy meter checking device, compared with accuracy of measuring when exporting fundamental current with electric energy meter checking device, thus the direct current of electric energy meter and even-order harmonic influence amount when measuring electric current positive half-wave.
Embodiment 2
Electric current bears the test philosophy figure of half-wave influence amount test as shown in Figure 4, a kind ofly test the direct current of electric energy meter and the test unit of even-order harmonic influence amount, comprise an electric energy meter, one for testing the electric energy meter checking device of the electric energy metrical accuracy of electric energy meter, one for exporting the DC current source of DC current to the current return of electric energy meter, voltage circuit and the current return of the voltage circuit of electric energy meter and current return and electric energy meter checking device are connected, the electrical energy pulse output terminal Test of electric energy meter is connected to the electrical energy pulse test input Test of electric energy meter checking device, the output plus terminal (I-) of DC current source is connected to the electric current end of incoming cables of the current return of electric energy meter, the output negative terminal (I+) of DC current source is connected to the current outlet end of the current return of electric energy meter.
First, the magnitude of voltage of the programmable AC power supply output fundamental voltage of the controller control electric energy meter checking device of electric energy meter checking device is the load voltage value of electric energy meter, the current value of the programmable AC power supply output fundamental current of the controller control electric energy meter checking device of electric energy meter checking device is the maximum current value of electric energy meter, then measures the accuracy of measuring of electric energy meter.
Secondly, the magnitude of voltage of the programmable AC power supply output fundamental voltage of the controller control electric energy meter checking device of electric energy meter checking device is the load voltage value of electric energy meter, the current value of the programmable AC power supply output fundamental current of the controller control electric energy meter checking device of electric energy meter checking device is 1/2 of the maximum current value of electric energy meter, the even-order harmonic electric current content that electric energy meter checking device exports is: 2 subharmonic current content are 42.44%, 4 subharmonic current content are 8.49%, 6 subharmonic current content are 3.64%, 8 subharmonic current content are 2.02%, 10 subharmonic current content are 1.28%, 12 subharmonic current content are 0.89%, 14 subharmonic current content are 0.65%, 16 subharmonic current content are 0.49%, 18 subharmonic current content are 0.39%, 20 subharmonic current content are 0.32%, the DC current values that DC current source exports is 31.83% of the maximum current of electric energy meter, like this, the half-wave current that an effective value is the maximum current of electric energy meter is obtained at the circuit loop of electric energy meter, the accuracy of measuring of electric energy meter is measured by electric energy meter checking device, compared with accuracy of measuring when exporting fundamental current with electric energy meter checking device, thus measure direct current and the even-order harmonic influence amount of electric energy meter when electric current bears half-wave.
Claims (2)
1. test the direct current of electric energy meter and the test unit of even-order harmonic influence amount for one kind, it is characterized in that: comprise an electric energy meter, one for testing the electric energy meter checking device of the electric energy metrical accuracy of electric energy meter, one for exporting the DC current source of DC current to the current return of electric energy meter, voltage circuit and the current return of the voltage circuit of electric energy meter and current return and electric energy meter checking device are connected, the electrical energy pulse of electric energy meter exports the electrical energy pulse test input being connected to electric energy meter checking device, the output plus terminal of DC current source is connected to the electric current end of incoming cables of the current return of electric energy meter, the output negative terminal of DC current source is connected to the current outlet end of the current return of electric energy meter.
2. test the direct current of electric energy meter and the test unit of even-order harmonic influence amount for one kind, it is characterized in that: comprise an electric energy meter, one for testing the electric energy meter checking device of the electric energy metrical accuracy of electric energy meter, one for exporting the DC current source of DC current to the current return of electric energy meter, voltage circuit and the current return of the voltage circuit of electric energy meter and current return and electric energy meter checking device are connected, the electrical energy pulse of electric energy meter exports the electrical energy pulse test input being connected to electric energy meter checking device, the output plus terminal of DC current source is connected to the current outlet end of the current return of electric energy meter, the output negative terminal of DC current source is connected to the electric current end of incoming cables of the current return of electric energy meter.
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Cited By (8)
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| CN105425199A (en) * | 2015-11-27 | 2016-03-23 | 深圳市科陆驱动技术有限公司 | Apparatus and method of direct-current even harmonic influence experiment of electric energy meter |
| CN105717363A (en) * | 2016-04-06 | 2016-06-29 | 威胜集团有限公司 | Current loop impedance testing device of smart meter and impedance calculation method |
| CN106054110A (en) * | 2016-05-31 | 2016-10-26 | 国网河北省电力公司电力科学研究院 | Intelligent electric energy meter harmonic influence testing method |
| CN106501754A (en) * | 2016-10-19 | 2017-03-15 | 浙江恩鸿电子有限公司 | The direct current of three-phase electric energy meter and the experimental rig of even-order harmonic influence amount |
| WO2017045488A1 (en) * | 2015-09-16 | 2017-03-23 | 中国电力科学研究院 | Test system for anti-dc component and even-order harmonic of current transformer |
| CN107576927A (en) * | 2017-08-23 | 2018-01-12 | 浙江万胜智能科技股份有限公司 | A kind of direct current of electric energy meter and the experimental rig of even-order harmonic influence amount |
| CN113009404A (en) * | 2021-01-26 | 2021-06-22 | 江阴长仪集团有限公司 | Method for calibrating direct-current even harmonic error and electric energy meter |
| CN114152790A (en) * | 2020-09-08 | 2022-03-08 | 武汉国测数据技术有限公司 | Ammeter box with error self-checking function and checking method thereof |
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| GB2556610B (en) * | 2015-09-16 | 2021-07-07 | China Electric Power Res Institute Company Limited | Test system for anti-DC component and even-order harmonic of current transformer |
| GB2556610A (en) * | 2015-09-16 | 2018-05-30 | China Electric Power Res Institute Company Limited | Test system for anti-DC component and even-order harmonic of current transformer |
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| CN105425199B (en) * | 2015-11-27 | 2019-01-22 | 深圳市科陆驱动技术有限公司 | A kind of electric energy meter direct current even-order harmonic influences the device and method of experiment |
| CN105425199A (en) * | 2015-11-27 | 2016-03-23 | 深圳市科陆驱动技术有限公司 | Apparatus and method of direct-current even harmonic influence experiment of electric energy meter |
| CN105717363A (en) * | 2016-04-06 | 2016-06-29 | 威胜集团有限公司 | Current loop impedance testing device of smart meter and impedance calculation method |
| CN106054110A (en) * | 2016-05-31 | 2016-10-26 | 国网河北省电力公司电力科学研究院 | Intelligent electric energy meter harmonic influence testing method |
| CN106501754A (en) * | 2016-10-19 | 2017-03-15 | 浙江恩鸿电子有限公司 | The direct current of three-phase electric energy meter and the experimental rig of even-order harmonic influence amount |
| CN106501754B (en) * | 2016-10-19 | 2023-05-02 | 浙江恩鸿电子有限公司 | Test device for direct current and even harmonic influence quantity of three-phase electric energy meter |
| CN107576927A (en) * | 2017-08-23 | 2018-01-12 | 浙江万胜智能科技股份有限公司 | A kind of direct current of electric energy meter and the experimental rig of even-order harmonic influence amount |
| CN114152790A (en) * | 2020-09-08 | 2022-03-08 | 武汉国测数据技术有限公司 | Ammeter box with error self-checking function and checking method thereof |
| CN114152790B (en) * | 2020-09-08 | 2024-03-15 | 武汉国测数据技术有限公司 | Ammeter box with error self-checking function and checking method thereof |
| CN113009404A (en) * | 2021-01-26 | 2021-06-22 | 江阴长仪集团有限公司 | Method for calibrating direct-current even harmonic error and electric energy meter |
| CN113009404B (en) * | 2021-01-26 | 2023-08-11 | 江阴长仪集团有限公司 | DC even harmonic error calibration method and electric energy meter |
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