CN104569904B - DC for testing electric energy meter test device for even harmonic influence quantity - Google Patents
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Abstract
The invention provides a test device for testing direct current and even harmonic influence quantity of an electric energy meter, which is characterized in that: the electric energy meter calibration device comprises an electric energy meter, an electric energy meter calibration device for testing the electric energy metering accuracy of the electric energy meter, a direct current source for outputting direct current to a current loop of the electric energy meter, wherein a voltage loop and a current loop of the electric energy meter are connected with the voltage loop and the current loop of the electric energy meter calibration device, an electric energy pulse output of the electric energy meter is connected to an electric energy pulse test input end of the electric energy meter calibration device, an output positive end of the direct current source is connected to a current outlet end of the current loop of the electric energy meter, an output negative end of the direct current source is connected to a current inlet end of the current loop of the electric energy meter, and the direct current and even harmonic influence quantity test of the electric energy meter can be completed without dividing the current measurement loop into two current branches, so that two diodes and balance impedance in the current measurement loop are saved.
Description
Technical Field
The invention relates to the technical field of electric energy measurement, in particular to a test device for testing direct current and even harmonic influence of an electric energy meter.
Background
In a power system, due to the large amount of use of power electronic devices, particularly the use of half-wave rectifying equipment, half-wave current appears in a power utilization circuit to generate a direct-current electric quantity component, and when direct-current exists in a current loop of an electric energy meter, the magnetic property of a magnetic core of an electromagnetic current transformer of the electric energy meter can be biochemically generated and even saturated, so that the electromagnetic current transformer of the electric energy meter cannot accurately measure and the accuracy of electric energy metering of the electric energy meter is affected, and therefore, the electromagnetic current transformer in the electric energy meter is required to have the capability of resisting the direct-current component, and meanwhile, a test device capable of testing the direct-current and even harmonic influence quantity of the electric energy meter is also required.
In the special requirement part 21 of the alternating current measuring equipment of the metering standard GB/T17215.321-2008 of the electric energy meter: in the static active electric energy meter (level 1 and level 2), for the direct access type electric energy meter, under the condition that a current input loop is half-wave current input, the limit of the change amount of the electric energy metering error of the electric energy meter is required to be not more than 3%, a test circuit for testing the direct current and even harmonic influence amount of the electric energy meter in the metering standard GB/T17215.321-2008 of the electric energy meter is shown as a figure 1, the test scheme divides the current loop into two branches through two diodes, alternating current of the current loop is divided into positive half-wave and negative half-wave, one branch is connected to the electric energy meter, the other branch is added with a balance load, the current positive half-wave passes through the electric energy meter, in order to reduce the load unbalance influence measurement results of the two current branches, the balance load is usually the electric energy meter of the same manufacturer, the same batch and the same period, in addition, in order to improve the balance condition, a resistor RB is further added in the two branches, the resistance value is 10 times of the impedance value of the electric energy meter, and in theory, the electric energy measured by the electric energy meter is half of the electric energy measured by the standard electric energy meter, and the direct current and even harmonic influence amount is tested.
The chinese patent CN103675749a provides a "performance detection device under dc and even harmonic states" of an electric energy meter, as shown in fig. 2, including a first rectifying diode, a second rectifying diode, a balanced impedance load, a standard electric energy meter, an electric energy meter and a single chip microcomputer, the forward current output of the standard electric energy meter is rectified by the first rectifying diode and then connected to the current input end of the electric energy meter, the reverse current output of the standard electric energy meter is rectified by the second rectifying diode and then connected to the rectifying negative end of the second rectifying diode, the impedance of the two current branches is equal, the balanced impedance load usually adopts the electric energy meter of the same manufacturer, the same batch and the same period, and the measurement results of the standard electric energy meter and the electric energy meter are output to the single chip microcomputer for comparison. Because the energy of flowing through the standard electric energy meter is 2 times that of flowing through the electric energy meter, the verification pulse constant of the standard electric energy meter is usually set to be 1/2 of the pulse constant of the electric energy meter in verification to test the direct current and even harmonic influence quantity of the electric energy meter.
In the existing measurement technical scheme, in order to test the direct current and even harmonic influence quantity of the electric energy meter, a current measurement loop is required to be divided into two current branches, and in order to enable a measurement result not to be influenced by unbalance of loads of the two branches, the impedance of the two current branches is required to be equal, so that the complexity of testing the direct current and even harmonic influence quantity of the electric energy meter is increased.
Disclosure of Invention
The invention aims at: the test device for testing the direct current and even harmonic influence of the electric energy meter is provided, and the direct current and even harmonic influence of the electric energy meter can be tested without dividing a current measuring loop into two current branches.
The technical scheme adopted by the invention is as follows: a test device for testing direct current and even harmonic influence quantity of an electric energy meter is characterized in that: the electric energy meter calibration device comprises an electric energy meter, an electric energy meter calibration device for testing the electric energy metering accuracy of the electric energy meter, a direct current source for outputting direct current to a current loop of the electric energy meter, wherein a voltage loop and a current loop of the electric energy meter are connected with the voltage loop and the current loop of the electric energy meter calibration device, an electric energy pulse output of the electric energy meter is connected to an electric energy pulse test input end of the electric energy meter calibration device, an output positive end of the direct current source is connected to a current inlet end of the current loop of the electric energy meter, and an output negative end of the direct current source is connected to an electric outlet end of the current loop of the electric energy meter, as shown in fig. 3. The controller of the electric energy meter calibration device controls the programmable alternating current power supply of the electric energy meter calibration device to output virtual loads to the standard electric energy meter and the electric energy meter of the electric energy meter calibration device, the standard electric energy meter of the electric energy meter calibration device measures the programmable alternating current power supply to output virtual loads and outputs electric energy pulses to the controller of the electric energy meter calibration device, the controller of the electric energy meter calibration device compares the electric energy pulses output by the electric energy meter with the standard electric energy pulses output by the standard electric energy meter, and further electric energy metering errors of the electric energy meter are obtained, the direct current source outputs direct current to a current loop of the electric energy meter, and the synthesized half-wave current is obtained in the current loop of the electric energy meter after waveform synthesis is carried out on the direct current output by the direct current source and fundamental wave and even harmonic wave current output by the electric energy meter calibration device, so that direct current and even harmonic wave influence quantity of the electric energy meter are measured.
The other technical scheme adopted by the invention is as follows: a test device for testing direct current and even harmonic influence quantity of an electric energy meter is characterized in that: the electric energy meter calibration device comprises an electric energy meter, an electric energy meter calibration device for testing the electric energy metering accuracy of the electric energy meter, a direct current source for outputting direct current to a current loop of the electric energy meter, wherein a voltage loop and a current loop of the electric energy meter are connected with the voltage loop and the current loop of the electric energy meter calibration device, an electric energy pulse output of the electric energy meter is connected to an electric energy pulse test input end of the electric energy meter calibration device, an output positive end of the direct current source is connected to a current outlet end of the current loop of the electric energy meter, and an output negative end of the direct current source is connected to a current inlet end of the current loop of the electric energy meter, as shown in fig. 4. The controller of the electric energy meter calibration device controls the programmable alternating current power supply of the electric energy meter calibration device to output virtual loads to the standard electric energy meter and the electric energy meter of the electric energy meter calibration device, the standard electric energy meter of the electric energy meter calibration device measures the programmable alternating current power supply to output virtual loads and outputs electric energy pulses to the controller of the electric energy meter calibration device, the controller of the electric energy meter calibration device compares the electric energy pulses output by the electric energy meter with the standard electric energy pulses output by the standard electric energy meter, and further electric energy metering errors of the electric energy meter are obtained, the direct current source outputs direct current to a current loop of the electric energy meter, and the synthesized half-wave current is obtained in the current loop of the electric energy meter after waveform synthesis is carried out on the direct current output by the direct current source and fundamental wave and even harmonic wave current output by the electric energy meter calibration device, so that direct current and even harmonic wave influence quantity of the electric energy meter are measured.
The beneficial effects of the invention are as follows: the test device for testing the direct current and even harmonic influence of the electric energy meter is provided, the direct current and even harmonic influence of the electric energy meter can be tested without dividing a current measuring loop into two current branches, and two diodes and one balance impedance in the current measuring loop are saved.
Description of the drawings
FIG. 1 is a test line diagram in the measurement standard GB/T17215.321-2008
FIG. 2 is a schematic diagram of the measurement of Chinese patent CN103675749A
FIG. 3 is a measurement schematic of example 1 of the present invention
FIG. 4 is a measurement schematic of embodiment 2 of the present invention
Detailed Description
The invention is described in detail below with reference to the following detailed description;
example 1
The Test schematic diagram of the current positive half-wave influence Test is shown in fig. 3, and the Test device for testing the direct current and even harmonic influence of the electric energy meter comprises an electric energy meter, an electric energy meter verification device for testing the electric energy metering accuracy of the electric energy meter, and a direct current source for outputting direct current to a current loop of the electric energy meter, wherein a voltage loop and a current loop of the electric energy meter are connected with the voltage loop and the current loop of the electric energy meter verification device, an electric energy pulse output end Test of the electric energy meter is connected to an electric energy pulse Test input end Test of the electric energy meter verification device, an output positive end (I+) of the direct current source is connected to a current inlet end of the current loop of the electric energy meter, and an output negative end (I-) of the direct current source is connected to an electric outlet end of the current loop of the electric energy meter.
Firstly, a controller of the electric energy meter checking device controls the voltage value of the fundamental wave voltage output by a programmable alternating current power supply of the electric energy meter checking device to be the rated voltage value of the electric energy meter, the controller of the electric energy meter checking device controls the current value of the fundamental wave current output by the programmable alternating current power supply of the electric energy meter checking device to be the maximum current value of the electric energy meter, and then measures the metering accuracy of the electric energy meter.
Secondly, the controller of the electric energy meter checking device controls the voltage value of the fundamental wave voltage output by the programmable alternating current power supply of the electric energy meter checking device to be the rated voltage value of the electric energy meter, the controller of the electric energy meter checking device controls the current value of the fundamental wave current output by the program-controlled alternating current power supply of the electric energy meter checking device to be 1/2 of the maximum current value of the electric energy meter, and the even harmonic current content output by the electric energy meter checking device is as follows: the harmonic current content of 2 times is 42.44%, the harmonic current content of 4 times is 8.49%, the harmonic current content of 6 times is 3.64%, the harmonic current content of 8 times is 2.02%, the harmonic current content of 10 times is 1.28%, the harmonic current content of 12 times is 0.89%, the harmonic current content of 14 times is 0.65%, the harmonic current content of 16 times is 0.49%, the harmonic current content of 18 times is 0.39%, the harmonic current content of 20 times is 0.32%, the direct current value output by the direct current source is 31.83% of the maximum current of the electric energy meter, thus, a half-wave current with an effective value of the maximum current of the electric energy meter is obtained in a circuit loop of the electric energy meter, the metering accuracy of the electric energy meter is measured through the electric energy meter calibration device, and compared with the metering accuracy when the electric energy meter calibration device outputs the fundamental wave current, and the direct current and even harmonic influence quantity of the electric energy meter when the current is positive half-wave is measured are measured.
Example 2
The Test schematic diagram of the current negative half-wave influence Test is shown in fig. 4, and the Test device for testing the direct current and even harmonic influence of the electric energy meter comprises an electric energy meter, an electric energy meter calibration device for testing the electric energy metering accuracy of the electric energy meter, and a direct current source for outputting direct current to a current loop of the electric energy meter, wherein a voltage loop and a current loop of the electric energy meter are connected with the voltage loop and the current loop of the electric energy meter calibration device, an electric energy pulse output end Test of the electric energy meter is connected to an electric energy pulse Test input end Test of the electric energy meter calibration device, an output negative end (I-) of the direct current source is connected to a current inlet end of the current loop of the electric energy meter, and an output positive end (I+) of the direct current source is connected to an electric outlet end of the current loop of the electric energy meter.
Firstly, a controller of the electric energy meter calibration device controls a voltage value of a fundamental wave voltage output by a programmable alternating current power supply of the electric energy meter calibration device to be a rated voltage value of the electric energy meter, and the controller of the electric energy meter calibration device controls a current value of the fundamental wave current output by the programmable alternating current power supply of the electric energy meter calibration device to be a maximum current value of the electric energy meter, and then measures metering accuracy of the electric energy meter.
Secondly, a controller of the electric energy meter calibration device controls a voltage value of a fundamental wave voltage output by a programmable alternating current power supply of the electric energy meter calibration device to be a rated voltage value of the electric energy meter, the controller of the electric energy meter calibration device controls a current value of the fundamental wave current output by the programmable alternating current power supply of the electric energy meter calibration device to be 1/2 of a maximum current value of the electric energy meter, and even harmonic current content output by the electric energy meter calibration device is as follows: the harmonic current content of 2 times is 42.44%, the harmonic current content of 4 times is 8.49%, the harmonic current content of 6 times is 3.64%, the harmonic current content of 8 times is 2.02%, the harmonic current content of 10 times is 1.28%, the harmonic current content of 12 times is 0.89%, the harmonic current content of 14 times is 0.65%, the harmonic current content of 16 times is 0.49%, the harmonic current content of 18 times is 0.39%, the harmonic current content of 20 times is 0.32%, the direct current value output by the direct current source is 31.83% of the maximum current of the electric energy meter, thus, a half-wave current with an effective value of the maximum current of the electric energy meter is obtained in a circuit loop of the electric energy meter, the metering accuracy of the electric energy meter is measured through the electric energy meter calibration device, and compared with the metering accuracy when the electric energy meter calibration device outputs the fundamental wave current, and the direct current and even harmonic influence quantity of the electric energy meter when the current is negative half-wave is measured.
Claims (2)
1. A test device for testing direct current and even harmonic influence quantity of an electric energy meter is characterized in that: the electric energy meter comprises an electric energy meter, an electric energy meter calibration device for testing the electric energy metering accuracy of the electric energy meter, a direct current source for outputting direct current to a current loop of the electric energy meter, wherein a voltage loop and a current loop of the electric energy meter are connected with the voltage loop and the current loop of the electric energy meter calibration device, the electric energy pulse output of the electric energy meter is connected to an electric energy pulse test input end of the electric energy meter calibration device, the output positive end of the direct current source is connected to a current inlet end of the current loop of the electric energy meter, and the output negative end of the direct current source is connected to a current outlet end of the current loop of the electric energy meter;
controller of electric energy meter calibration device controls program control of electric energy meter calibration device ac power supply for outputting fundamental voltage zxfoom , the controller of the electric energy meter checking device controls the current value of the fundamental wave current output by the programmable alternating current power supply of the electric energy meter checking device to be the maximum current value of the electric energy meter, and then measures the metering accuracy of the electric energy meter;
the controller of the electric energy meter calibration device controls the voltage value of the fundamental wave voltage output by the programmable alternating current power supply of the electric energy meter calibration device to be the rated voltage value of the electric energy meter, the controller of the electric energy meter calibration device controls the current value of the fundamental wave current output by the programmable alternating current power supply of the electric energy meter calibration device to be 1/2 of the maximum current value of the electric energy meter, and the even harmonic current content output by the electric energy meter calibration device is as follows: 2. the harmonic current content is 42.44%, the harmonic current content of 4 times is 8.49%, the harmonic current content of 6 times is 3.64%, the harmonic current content of 8 times is 2.02%, the harmonic current content of 10 times is 1.28%, the harmonic current content of 12 times is 0.89%, the harmonic current content of 14 times is 0.65%, the harmonic current content of 16 times is 0.49%, the harmonic current content of 18 times is 0.39%, the harmonic current content of 20 times is 0.32%, the direct current value output by the direct current source is 31.83% of the maximum current of the electric energy meter, thus, a half-wave current with an effective value of the maximum current of the electric energy meter is obtained in the circuit loop of the electric energy meter, the metering accuracy of the electric energy meter is measured through the electric energy meter calibration device, and compared with the metering accuracy when the electric energy meter calibration device outputs the fundamental wave current, and the direct current and even harmonic influence quantity of the electric energy meter when the current is positive half-wave are measured.
2. A test device for testing direct current and even harmonic influence quantity of an electric energy meter is characterized in that: the electric energy meter comprises an electric energy meter, an electric energy meter calibration device for testing the electric energy metering accuracy of the electric energy meter, a direct current source for outputting direct current to a current loop of the electric energy meter, wherein a voltage loop and a current loop of the electric energy meter are connected with the voltage loop and the current loop of the electric energy meter calibration device, the electric energy pulse output of the electric energy meter is connected to an electric energy pulse test input end of the electric energy meter calibration device, the output positive end of the direct current source is connected to a current outlet end of the current loop of the electric energy meter, and the output negative end of the direct current source is connected to a current inlet end of the current loop of the electric energy meter;
the controller of the electric energy meter checking device controls the voltage value of the fundamental wave voltage output by the programmable alternating current power supply of the electric energy meter checking device to be the rated voltage value of the electric energy meter, and the controller of the electric energy meter checking device controls the current value of the fundamental wave current output by the programmable alternating current power supply of the electric energy meter checking device to be the maximum current value of the electric energy meter, and then measures the metering accuracy of the electric energy meter;
the controller of the electric energy meter calibration device controls the voltage value of the fundamental wave voltage output by the programmable alternating current power supply of the electric energy meter calibration device to be the rated voltage value of the electric energy meter, the controller of the electric energy meter calibration device controls the current value of the fundamental wave current output by the programmable alternating current power supply of the electric energy meter calibration device to be 1/2 of the maximum current value of the electric energy meter, and the even harmonic current content output by the electric energy meter calibration device is as follows: 2. the harmonic current content is 42.44%, the harmonic current content of 4 times is 8.49%, the harmonic current content of 6 times is 3.64%, the harmonic current content of 8 times is 2.02%, the harmonic current content of 10 times is 1.28%, the harmonic current content of 12 times is 0.89%, the harmonic current content of 14 times is 0.65%, the harmonic current content of 16 times is 0.49%, the harmonic current content of 18 times is 0.39%, the harmonic current content of 20 times is 0.32%, the direct current value output by the direct current source is 31.83% of the maximum current of the electric energy meter, thus, a half-wave current with an effective value of the maximum current of the electric energy meter is obtained in the circuit loop of the electric energy meter, the metering accuracy of the electric energy meter is measured through the electric energy meter calibration device, and compared with the metering accuracy when the electric energy meter calibration device outputs the fundamental wave current, and the direct current and even harmonic influence quantity of the electric energy meter in the negative half-wave current are measured.
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