Electric energy meter reversing device, reversing test system, method and device and storage medium

Abstract

The invention provides an electric energy meter reversing device, a reversing test system, method and device and a storage medium, and relates to the technical field of electric energy meters. The electric energy meter reversing device comprises a current power amplifier; the input end of the first switch path is connected with the positive electrode of the current power amplifier, the first output end of the first switch path is connected with the positive electrode of the to-be-tested electric energy meter, and the second output end of the first switch path is connected with the negative electrode of the to-be-tested electric energy meter; the input end of the second switch path is connected with the negative electrode of the current power amplifier, the first output end of the second switch path is connected with the positive electrode of the to-be-tested electric energy meter, and the second output end of the second switch path is connected with the negative electrode of the to-be-tested electric energy meter; and the control circuit is connected with the control end of the first switch path and the control end of the second switch path. The problem that the current power amplifier is damaged due to magnetic saturation of the output transformer in the current power amplifier is solved.

Description

Technical Field

[0001] The present application relates to the technical field of electric energy meters, and in particular to an electric energy meter commutation device, a commutation test system, a method, a device and a storage medium. Background Art

[0002] Since the electric energy meter needs to be tested for rapid changes in flow direction, forward and reverse currents need to be input alternately into the electric energy meter during the test so that the forward and reverse currents are repeatedly switched several times in the electric energy meter.

[0003] In the related art, a waveform generator is adjusted on the current amplifier of the test device so that the current amplifier directly outputs the required forward and reverse waveforms. Due to switching during the current output process, it is very easy for the output transformer to be magnetically saturated, resulting in damage to the amplifier. In addition, the main body of the test device needs to be modified, which results in high production costs. How to avoid damage to the amplifier due to magnetic saturation of the output transformer has become an urgent problem that needs to be solved. Summary of the invention

[0004] The present application aims to solve at least one of the technical problems existing in the prior art or related art.

[0005] To this end, a first aspect of the present application proposes a commutation device for an electric energy meter.

[0006] A second aspect of the present application provides a commutation test system.

[0007] A third aspect of the present application provides a commutation test method.

[0008] A fourth aspect of the present application provides a commutation testing device.

[0009] A fifth aspect of the present application provides a commutation testing device.

[0010] A sixth aspect of the present application provides a readable storage medium.

[0011] In view of this, the first aspect of the present application provides an electric energy meter commutation device, which is applied to a commutation test system, the commutation test system is used to test the electric energy meter to be tested, and the electric energy meter commutation device includes: a current amplifier; a first switch path, the input end of the first switch path is connected to the positive pole of the current amplifier, the first output end of the first switch path is connected to the positive pole of the electric energy meter to be tested, and the second output end of the first switch path is connected to the negative pole of the electric energy meter to be tested; a second switch path, the input end of the second switch path is connected to the negative pole of the current amplifier, the first output end of the second switch path is connected to the positive pole of the electric energy meter to be tested, and the second output end of the second switch path is connected to the negative pole of the electric energy meter to be tested; a control circuit, the control circuit is connected to the control end of the first switch path and the control end of the second switch path, the control circuit is used to control the input end of the first switch path to be connected to the first output end or the second output end, and control the input end of the second switch path to be connected to the first output end or the second output end.

[0012] In the technical solution of the present application, the commutation test system is used to perform a rapid flow direction change test on the electric energy meter under test. The electric energy meter under test is connected to the commutation test system. The commutation test system can alternately change the current direction of the current transmitted to the electric energy meter under test, thereby performing a rapid direction change test on the electric energy meter under test.

[0013] In this technical solution, the commutation device of the electric energy meter includes a current amplifier, which is a current source in the commutation test system, and is used to provide current to the electric energy meter to be tested. A first switch path is arranged between the positive pole of the current amplifier and the electric energy meter to be tested, and the conduction state of the positive pole of the current amplifier and the positive pole or negative pole of the electric energy meter to be tested can be switched through the first switch path. A second switch path is arranged between the negative pole of the current amplifier and the electric energy meter to be tested, and the conduction state of the negative pole of the current amplifier and the positive pole or negative pole of the electric energy meter to be tested can be switched through the second switch path.

[0014] Specifically, the input end of the first switch path is connected to the positive pole of the current amplifier, the first switch path includes two output ends, and the first switch path can be controlled to switch the conduction state of the input end and the two output ends, that is, the input end of the first switch path can be connected to the first output end of the first switch path, and the input end of the first switch path can also be connected to the second output end of the first switch path. When the input end of the first switch path is connected to the first output end of the first switch path, the positive pole of the current amplifier is connected to the positive pole of the electric energy meter to be tested, and when the input end of the first switch path is connected to the second output end of the first switch path, the positive pole of the current amplifier is connected to the negative pole of the electric energy meter to be tested.

[0015] The input end of the second switch path is connected to the positive and negative electrodes of the current amplifier, and the second switch path includes two output ends. The second switch path can be controlled to switch the conduction state of the input end and the two output ends, that is, the input end of the second switch path can be connected to the first output end of the second switch path, and the input end of the second switch path can also be connected to the second output end of the second switch path. When the input end of the second switch path is connected to the first output end of the second switch path, the negative electrode of the current amplifier is connected to the positive electrode of the electric energy meter to be tested, and when the input end of the second switch path is connected to the second output end of the second switch path, the negative electrode of the current amplifier is connected to the negative electrode of the electric energy meter to be tested.

[0016] The input end of the first switch path is connected to the first output end, and the input end of the second switch path is connected to the second output end. At this time, the positive pole of the current amplifier is connected to the positive pole of the electric energy meter to be tested, and the negative pole of the current amplifier is connected to the negative pole of the electric energy meter to be tested.

[0017] The input end of the first switch path is connected to the second output end, and the input end of the second switch path is connected to the first output end. At this time, the positive pole of the current amplifier is connected to the negative pole of the electric energy meter to be tested, and the negative pole of the current amplifier is connected to the positive pole of the electric energy meter to be tested.

[0018] In combination with the above content, it can be seen that the first switch path is used to control the on-off state between the positive pole of the current amplifier and the positive and negative poles of the electric energy meter to be tested, and the second switch path is used to control the on-off state between the negative pole of the current amplifier and the positive and negative poles of the electric energy meter to be tested. By coordinating the actions of controlling the first switch path and the second switch path, the current direction transmitted by the current amplifier to the electric energy meter to be tested can be adjusted, thereby realizing the switching of the current direction input into the electric energy meter to be tested.

[0019] In this technical solution, the commutation device of the electric energy meter also includes a control circuit, which is connected to the control ends of the first switch path and the second switch path respectively, and the actions of the first switch path and the second switch path can be controlled by the control circuit. It can be understood that the commutation test system includes a host computer, which can transmit a control signal to the control circuit, thereby triggering the control circuit to control the first switch path and the second switch path.

[0020] In the technical solution of the present application, a switch component including a first switch path and a second switch path is arranged between the current amplifier and the electric energy meter to be tested. There is no need to change the internal circuit of the current amplifier, so that the commutation circuit can adapt to most current amplifiers, reducing the production and design cost of the commutation test system. In the process of the commutation circuit commutating the current, the saturation voltage drop of the switch component is small, and the current commutation speed is fast, which can meet the rapid change of the direction of large current in the electric energy meter to be tested. The absolute value of the current commutation will not change after switching, and the current output is more stable. There is no need to change the output action of the current amplifier during the current commutation process, which solves the problem of damage to the current amplifier caused by magnetic saturation of the output transformer in the current amplifier.

[0021] In some technical schemes, optionally, the first switch path includes: a first switch group, a first end of the first switch group is connected to the positive pole of the current amplifier, a second end of the first switch group is connected to the positive pole of the electric energy meter to be tested, and a control end of the first switch group is connected to the control circuit; a second switch group, a first end of the second switch group is connected to the positive pole of the current amplifier, a second end of the second switch group is connected to the negative pole of the electric energy meter to be tested, and a control end of the second switch group is connected to the control circuit.

[0022] In this technical solution, the first switch path includes a first switch group and a second switch group. The first switch group is connected between the positive pole of the current amplifier and the positive pole of the electric energy meter to be tested, and the on-off state between the positive pole of the current amplifier and the positive pole of the electric energy meter to be tested can be controlled by controlling the on-off state of the first switch group. The second switch group is connected between the positive pole of the current amplifier and the negative pole of the electric energy meter to be tested, and the on-off state between the positive pole of the current amplifier and the negative pole of the electric energy meter to be tested can be controlled by controlling the on-off state of the second switch group. It should be noted that one of the first switch group and the second switch group is turned on and the other is turned off.

[0023] When transmitting forward current to the electric energy meter to be tested, the first switch group is in the on state, and the second switch group is in the off state, and the positive pole of the current amplifier is connected to the positive pole of the electric energy meter to be tested. When transmitting reverse current to the electric energy meter to be tested, the first switch group is in the off state, and the second switch group is in the on state, and the positive pole of the current amplifier is connected to the negative pole of the electric energy meter to be tested.

[0024] In the technical solution of the present application, two parallel first switch groups and second switch groups are arranged in the first switch path, and the control ends of the first switch group and the second switch group are respectively connected to the control circuit, so that the control circuit can control the first switch group and the second switch group separately, so as to quickly switch the current direction output to the electric energy meter to be tested. Since the current switching action is realized by the action of the first switch path and the second switch path at the rear end of the current amplifier, the transformer end current in the current amplifier will not alternate between positive and negative directions, thereby solving the problem of magnetic saturation of the transformer due to possible current superposition.

[0025] In some technical schemes, optionally, the first switch path includes: a first single-pole double-throw switch, the moving contact of the first single-pole double-throw switch is connected to the positive pole of the current amplifier, the first static contact of the first single-pole double-throw switch is connected to the positive pole of the electric energy meter to be tested, the second static contact of the first single-pole double-throw switch is connected to the negative pole of the electric energy meter to be tested, and the control end of the first single-pole double-throw switch is connected to the control circuit.

[0026] In this technical solution, the first switch path includes a first single-pole double-throw switch, the first single-pole double-throw switch includes a moving contact and two stationary contacts, the first stationary contact of the two stationary contacts is connected to the positive pole of the electric energy meter to be measured, the second stationary contact is connected to the negative pole of the electric energy meter to be measured, and the moving contact is connected to the positive pole of the current amplifier. By selecting to connect the moving contact of the first single-pole double-throw switch to the first stationary contact or the second stationary contact, the positive pole of the current amplifier is selectively connected to the positive pole or the negative pole of the electric energy meter to be measured.

[0027] Specifically, when transmitting a forward current to the electric energy meter to be tested, the moving contact of the first single-pole double-throw switch is connected to the first static contact, and the positive pole of the current amplifier is connected to the positive pole of the electric energy meter to be tested. When transmitting a reverse current to the electric energy meter to be tested, the moving contact of the first single-pole double-throw switch is connected to the second static contact, and the positive pole of the current amplifier is connected to the negative pole of the electric energy meter to be tested.

[0028] In the technical solution of the present application, a first single-pole double-throw switch is arranged in the first switch path, and the moving contact of the first single-pole double-throw switch is connected to the positive pole of the current amplifier, and the first static contact and the second static contact of the first single-pole double-throw switch are respectively connected to the positive pole and the negative pole of the electric energy meter to be tested. That is, the control circuit can switch the conduction state between the positive and negative poles of the electric energy meter to be tested and the positive pole of the current amplifier by controlling the first single-pole double-throw switch, thereby further improving the response speed of the first switch path.

[0029] In some technical solutions, optionally, the second switch path includes:

[0030] A third switch group, wherein a first end of the third switch group is connected to the negative electrode of the current amplifier, a second end of the third switch group is connected to the positive electrode of the electric energy meter to be measured, and a control end of the third switch group is connected to the control circuit;

[0031] A fourth switch group, wherein a first end of the fourth switch group is connected to the negative electrode of the current amplifier, a second end of the fourth switch group is connected to the negative electrode of the electric energy meter to be measured, and a control end of the fourth switch group is connected to the control circuit.

[0032] In this technical solution, the second switch path includes a third switch group and a fourth switch group. The third switch group is connected between the negative pole of the current amplifier and the positive pole of the electric energy meter to be tested, and the on-off state between the negative pole of the current amplifier and the positive pole of the electric energy meter to be tested can be controlled by controlling the on-off state of the third switch group. The fourth switch group is connected between the negative pole of the current amplifier and the negative pole of the electric energy meter to be tested, and the on-off state between the negative pole of the current amplifier and the negative pole of the electric energy meter to be tested can be controlled by controlling the on-off state of the fourth switch group. It should be noted that one of the third switch group and the fourth switch group is turned on and the other is turned off.

[0033] When transmitting reverse current to the electric energy meter to be tested, the third switch group is in the on state, and the fourth switch group is in the off state, and the negative pole of the current amplifier is connected to the positive pole of the electric energy meter to be tested. When transmitting forward current to the electric energy meter to be tested, the third switch group is in the off state, and the fourth switch group is in the on state, and the negative pole of the current amplifier is connected to the negative pole of the electric energy meter to be tested.

[0034] In the technical solution of the present application, two parallel third switch groups and fourth switch groups are arranged in the second switch path, and the control ends of the third switch group and the fourth switch group are respectively connected to the control circuit, so that the control circuit can control the third switch group and the fourth switch group individually, so as to quickly switch the current direction output to the electric energy meter to be tested. Since the current switching action is realized by the action of the first switch path and the second switch path at the rear end of the current amplifier, the transformer end current in the current amplifier will not alternate between positive and negative directions, thereby solving the problem of magnetic saturation of the transformer due to possible current superposition.

[0035] In some technical solutions, optionally, the second switch path includes:

[0036] A second single-pole double-throw switch, the moving contact of the second single-pole double-throw switch is connected to the negative pole of the current amplifier, the first static contact of the second single-pole double-throw switch is connected to the positive pole of the electric energy meter to be tested, the second static contact of the second single-pole double-throw switch is connected to the negative pole of the electric energy meter to be tested, and the control end of the second single-pole double-throw switch is connected to the control circuit.

[0037] In this technical solution, the second switch path includes a second single-pole double-throw switch, the second single-pole double-throw switch includes a moving contact and two stationary contacts, the first stationary contact of the two stationary contacts is connected to the positive pole of the electric energy meter to be measured, the second stationary contact is connected to the negative pole of the electric energy meter to be measured, and the moving contact is connected to the negative pole of the current amplifier. By selecting to connect the moving contact of the second single-pole double-throw switch to the first stationary contact or the second stationary contact, the negative pole of the current amplifier is selectively connected to the positive pole or the negative pole of the electric energy meter to be measured.

[0038] Specifically, when transmitting a forward current to the electric energy meter to be tested, the moving contact of the second single-pole double-throw switch is connected to the second static contact, and the negative pole of the current amplifier is connected to the negative pole of the electric energy meter to be tested. When transmitting a reverse current to the electric energy meter to be tested, the moving contact of the second single-pole double-throw switch is connected to the first static contact, and the negative pole of the current amplifier is connected to the positive pole of the electric energy meter to be tested.

[0039] In the technical solution of the present application, a second single-pole double-throw switch is arranged in the second switch path, and the moving contact of the second single-pole double-throw switch is connected to the negative pole of the current amplifier, and the first static contact and the second static contact of the second single-pole double-throw switch are respectively connected to the positive pole and the negative pole of the electric energy meter to be tested. That is, the control circuit can switch the conduction state between the positive and negative poles of the electric energy meter to be tested and the negative pole of the current amplifier by controlling the second single-pole double-throw switch, thereby further improving the response speed of the second switch path.

[0040] In some technical solutions, optionally, the first switch path and the second switch path include at least one of the following items or a combination thereof: a solid-state relay, a MOS (Metal Oxide Semiconductor Field Effect Transistor) tube, an IGBT (Insulate-Gate Bipolar Transistor) tube.

[0041] In the technical solution of the present application, the first switch path and the second switch path can be constructed using at least one electronic control device selected from the group consisting of a solid-state relay, a MOS tube, and an IGBT tube. Compared with ordinary relays or mechanical switches in the related art, they have the advantages of faster response speed and longer service life, and do not generate noise when operating. Since the commutation circuit is arranged in the commutation test system, the current direction of the electric energy meter to be tested needs to be frequently switched. Therefore, the service life and quietness of the commutation test system can be improved.

[0042] In some technical solutions, optionally, the output current of the current amplifier has a value range of greater than 0A and less than 200A; and / or the output voltage of the current amplifier has a value range of greater than 0V and less than 100V.

[0043] In the technical solution of the present application, the value range of the output current of the current amplifier is set to be greater than 0A and less than 200A, so that the commutation circuit can be applicable to the test scenario of current commutation in a wider current range. The value range of the output voltage of the current amplifier is set to be greater than 0V and less than 100V, so that the commutation circuit can be applicable to the test scenario of current commutation in a wider voltage range.

[0044] In some technical solutions, optionally, the on-off reaction time of the first switch path and the second switch path ranges from 1 ms to 5 ms.

[0045] In the technical solution of the present application, by setting the on-off response time of the first switch path and the second switch path to be greater than or equal to 1ms and less than or equal to 5ms, the direction of the current transmitted by the current amplifier to the electric energy meter to be tested can be switched at a faster conversion speed, thereby improving the accuracy and stability of the commutation test system in testing the electric energy meter.

[0046] According to the second aspect of the present application, a commutation test system is provided, comprising: an electric energy meter commutation device in any of the above technical solutions; and a host computer, wherein a signal output terminal of the host computer is connected to a control circuit in the electric energy meter commutation device. Therefore, all the beneficial effects of the electric energy meter commutation device in any of the above technical solutions are not described one by one here.

[0047] According to a third aspect of the present application, a commutation test method is provided, which is applied to the commutation device of the electric energy meter in any of the above-mentioned technical solutions. The commutation test method includes: when the current power amplifier is running, alternately transmitting a first control signal and a second control signal to the control circuit, wherein the first control signal is used to trigger the control circuit to control the input end of the first switch path to be connected with the first output end, and the input end of the second switch path to be connected with the second output end, and the second control signal is used to trigger the control circuit to control the input end of the first switch path to be connected with the second output end, and the input end of the second switch path to be connected with the first output end; timing the total transmission time of the first control signal and the second control signal; when the total transmission time reaches a preset time, controlling the current power amplifier to stop running.

[0048] In this technical solution, at the beginning stage of the commutation test on the electric energy meter to be tested, the control current amplifier starts to run and alternately transmits the first control signal and the second control signal to the control circuit in the commutation device of the electric energy meter, that is, in the same time period, only one of the first control signal or the second control signal is transmitted to the control circuit.

[0049] When receiving the first control signal, the control circuit controls the input end of the first switch path to be connected with the first output end, and controls the input end of the second switch path to be connected with the second output end. At this time, the positive pole of the current amplifier is connected with the positive pole of the electric energy meter to be tested, and the negative pole of the current amplifier is connected with the negative pole of the electric energy meter to be tested, thereby transmitting a forward current to the electric energy meter to be tested.

[0050] When receiving the second control signal, the control circuit controls the input end of the first switch path to be connected with the second output end, and controls the input end of the second switch path to be connected with the first output end. At this time, the positive pole of the current amplifier is connected with the negative pole of the electric energy meter to be tested, and the negative pole of the current amplifier is connected with the positive pole of the electric energy meter to be tested, thereby transmitting reverse current to the electric energy meter to be tested.

[0051] Specifically, the commutation test method is executed by the host computer. When the control circuit receives the control signal transmitted by the host computer, the control signal received this time is compared with the control signal received last time. If the control signals received twice are the same, the drive signal transmitted to the first switch path and the second switch path is kept unchanged; if the control signals received twice are different, the drive signal to the first switch path and the second switch path is adjusted, thereby changing the direction of the current transmitted to the electric energy meter to be tested.

[0052] In this technical solution, in the process of alternately transmitting the first control signal and the second control signal to the control circuit, the total transmission time of the first control signal and the second control signal to the control circuit is timed. When the timing reaches a preset time, it is determined that the commutation test is completed. At this time, the control current amplifier stops running, no longer transmits current to the electric energy meter to be tested, and stops transmitting the first control signal or the second control signal to the control circuit, so that the first switch path and the second switch path return to their initial states.

[0053] In the technical solution of the present application, a switch component including a first switch path and a second switch path is arranged between the current amplifier and the electric energy meter to be tested. There is no need to change the internal circuit of the current amplifier, so that the commutation circuit can adapt to most current amplifiers, reducing the production and design cost of the commutation test system. In the process of the commutation circuit commutating the current, the saturation voltage drop of the switch component is small, and the current commutation speed is fast, which can meet the rapid change of the direction of large current in the electric energy meter to be tested. The absolute value of the current commutation will not change after switching, and the current output is more stable. There is no need to change the output action of the current amplifier during the current commutation process, which solves the problem of damage to the current amplifier caused by magnetic saturation of the output transformer in the current amplifier.

[0054] In the technical solution of the present application, by alternately transmitting the first control signal and the second control signal to the control circuit, the direction of the current transmitted to the electric energy meter to be tested can be alternately switched through the control circuit, and the test process can be timed, and the test can be automatically stopped after the timing is completed, further simplifying the operating steps of the tester.

[0055] In some technical solutions, optionally, the first control signal and the second control signal are transmitted alternately to the control circuit, including: transmitting the first control signal to the control circuit until a first time duration is reached; transmitting the second control signal to the control circuit until a second time duration is reached, and returning to execute the step of transmitting the first control signal to the control circuit.

[0056] In this technical solution, in the process of alternately transmitting the first control signal and the second control signal to the control circuit, the first control signal is first transmitted to the control circuit, thereby transmitting a forward current to the electric energy meter to be tested, and the duration of the forward current transmission to the electric energy meter to be tested is timed. When the timing reaches the first duration, the second control signal is started to be transmitted to the control circuit, thereby transmitting a reverse current to the electric energy meter to be tested, and the duration of the reverse current transmission to the electric energy meter to be tested is timed. When the timing reaches the second duration, the step of transmitting the first control signal is returned to achieve alternating switching of the current direction in the electric energy meter to be tested.

[0057] In the technical solution of the present application, in the process of transmitting a control signal to a control circuit, by timing the duration of transmitting the first control signal and the duration of transmitting the second control signal, and switching the transmitted first control signal and the second control signal according to the timing result, it is possible to automatically alternately switch the direction of the current transmitted to the electric energy meter to be tested, thereby further simplifying the operating steps.

[0058] In some technical solutions, optionally, the first duration is the same as the second duration.

[0059] In the technical solution of the present application, by setting the first duration of transmitting the first control signal to the control circuit and the second duration of transmitting the second control signal to the control circuit to be equal during the commutation test, it can be ensured that the duration of the forward current passing through the electric energy meter is equal to the duration of the reverse current passing through, thereby improving the accuracy of the commutation test process.

[0060] According to a fourth aspect of the present application, a commutation test device is provided, which is applied to the commutation device of the electric energy meter in any of the above-mentioned technical solutions, and the commutation test device includes: a transmission module, which is used to alternately transmit a first control signal and a second control signal to a control circuit when the current power amplifier is running, wherein the first control signal is used to trigger the control circuit to control the input end of the first switch path to be connected with the first output end, and the input end of the second switch path to be connected with the second output end, and the second control signal is used to trigger the control circuit to control the input end of the first switch path to be connected with the second output end, and the input end of the second switch path to be connected with the first output end; a timing module, which is used to time the total transmission time of the first control signal and the second control signal; and a control module, which is used to control the current power amplifier to stop running when the total transmission time reaches a preset time.

[0061] In the technical solution of the present application, a switch component including a first switch path and a second switch path is arranged between the current amplifier and the electric energy meter to be tested. There is no need to change the internal circuit of the current amplifier, so that the commutation circuit can adapt to most current amplifiers, reducing the production and design cost of the commutation test system. In the process of the commutation circuit commutating the current, the saturation voltage drop of the switch component is small, and the current commutation speed is fast, which can meet the rapid change of the direction of large current in the electric energy meter to be tested. The absolute value of the current commutation will not change after switching, and the current output is more stable. There is no need to change the output action of the current amplifier during the current commutation process, which solves the problem of damage to the current amplifier caused by magnetic saturation of the output transformer in the current amplifier.

[0062] In the technical solution of the present application, by alternately transmitting the first control signal and the second control signal to the control circuit, the direction of the current transmitted to the electric energy meter to be tested can be alternately switched through the control circuit, and the test process can be timed, and the test can be automatically stopped after the timing is completed, further simplifying the operating steps of the tester.

[0063] According to a fifth aspect of the present application, a commutation test device is provided, the commutation test device comprising a processor and a memory, wherein a program or instruction is stored in the memory, and when the program or instruction is executed by the processor, the steps of the commutation test method in any of the above technical solutions are implemented. Therefore, the commutation test device has all the beneficial effects of the commutation test method in any of the above technical solutions, which will not be repeated here.

[0064] According to the sixth aspect of the present application, a readable storage medium is provided, on which a program or instruction is stored. When the program or instruction is executed by a processor, the steps of the commutation test method in any of the above-mentioned technical solutions are implemented, thereby having all the beneficial technical effects of the commutation test method in any of the above-mentioned technical solutions.

[0065] Additional aspects and advantages of the present application will become apparent in the following description or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0067] Figure 1 A structural block diagram of an electric energy meter commutation device provided in some embodiments of the present application is shown;

[0068] Figure 2 One of the circuit diagrams of the commutation device of the electric energy meter provided in some embodiments of the present application is shown;

[0069] Figure 3 A second circuit diagram of the commutation device of an electric energy meter provided in some embodiments of the present application is shown;

[0070] Figure 4 A schematic diagram showing the output of a forward current to an electric energy meter to be tested provided in some embodiments of the present application is shown;

[0071] Figure 5 A schematic diagram showing a reverse current output to an electric energy meter to be tested provided in some embodiments of the present application is shown;

[0072] Figure 6 A schematic block diagram of a commutation test system provided in some embodiments of the present application is shown;

[0073] Figure 7 A flow chart of a commutation test method provided in some embodiments of the present application is shown;

[0074] Figure 8 One of the structural block diagrams of a commutation test device is shown in some embodiments of the present application;

[0075] Fig. 9 A second structural block diagram of a commutation test device provided in some embodiments of the present application is shown.

[0076] in, Figures 1 to 6 The corresponding relationship between the reference numerals and component names in the figure is:

[0077] 100 watt-hour meter commutation device, 110 current amplifier, 120 first switch path, 130 second switch path, 140 switch assembly, 150 control circuit, K1 first switch group, K2 second switch group, K3 third switch group, K4 fourth switch group, SPDT1 first single-pole double-throw switch, SPDT2 second single-pole double-throw switch, 200 commutation test system, 201 host computer, 300 watt-hour meter to be tested. DETAILED DESCRIPTION

[0078] In order to more clearly understand the above-mentioned purposes, features and advantages of the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0079] In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present application is not limited to the specific embodiments disclosed below.

[0080] Refer to the following Figures 1 to 9 An electric energy meter commutation device, a commutation test system, a method, a device and a storage medium according to some embodiments of the present application are described.

[0081] Figure 1 shows a structural block diagram of an electric energy meter commutation device provided in some embodiments of the present application,

[0082] Figure 2 One of the circuit diagrams of the commutation device of the electric energy meter provided in some embodiments of the present application is shown. Figure 3 FIG. 2 shows a second circuit diagram of an electric energy meter commutation device provided in some embodiments of the present application, such as Figure 1 , Figure 2 and Figure 3 As shown, the commutation device 100 of the electric energy meter is applied to the commutation test system 200, and the commutation test system 200 is used to test the electric energy meter 300 to be tested. The commutation device 100 of the electric energy meter includes: a current amplifier 110; a first switch path 120, the input end of the first switch path 120 is connected to the positive electrode of the current amplifier 110, the first output end of the first switch path 120 is connected to the positive electrode of the electric energy meter 300 to be tested, and the second output end of the first switch path 120 is connected to the negative electrode of the electric energy meter 300 to be tested; a second switch path 130, the input end of the second switch path 130 is connected to the positive electrode of the electric energy meter 300 to be tested, and the second output end of the first switch path 120 is connected to the negative electrode of the electric energy meter 300 to be tested; The first output terminal of the second switch path 130 is connected to the positive electrode of the electric energy meter 300 to be tested, and the second output terminal of the second switch path 130 is connected to the negative electrode of the electric energy meter 300 to be tested; the control circuit 150, the control circuit 150 is connected to the control terminal of the first switch path 120 and the control terminal of the second switch path 130, and the control circuit 150 is used to control the input terminal of the first switch path 120 to be connected to the first output terminal or the second output terminal, and control the input terminal of the second switch path 130 to be connected to the first output terminal or the second output terminal.

[0083] Figure 2 and Figure 3 The I+ represents the positive electrode and the I- represents the negative electrode.

[0084] In the embodiment of the present application, the commutation test system 200 is used to perform a rapid flow direction change test on the electric energy meter 300 to be tested. The electric energy meter 300 to be tested is connected to the commutation test system 200. The commutation test system 200 can alternately change the current direction of the current transmitted to the electric energy meter 300 to be tested, thereby performing a rapid direction change test on the electric energy meter 300 to be tested.

[0085] In this embodiment, the commutation device 100 of the electric energy meter includes a current amplifier 110, which is a current source in the commutation test system 200, and is used to provide current to the electric energy meter 300 to be tested. The first switch path 120 is arranged between the positive electrode of the current amplifier 110 and the electric energy meter 300 to be tested, and the conduction state between the positive electrode of the current amplifier 110 and the positive electrode or the negative electrode of the electric energy meter 300 to be tested can be switched through the first switch path 120. The second switch path 130 is arranged between the negative electrode of the current amplifier 110 and the electric energy meter 300 to be tested, and the conduction state between the negative electrode of the current amplifier 110 and the positive electrode or the negative electrode of the electric energy meter 300 to be tested can be switched through the second switch path 130.

[0086] Specifically, the input end of the first switch path 120 is connected to the positive electrode of the current amplifier 110, and the first switch path 120 includes two output ends. The first switch path 120 can be controlled to switch the conduction state between the input end and the two output ends, that is, the input end of the first switch path 120 can be conducted with the first output end of the first switch path 120, and the input end of the first switch path 120 can also be conducted with the second output end of the first switch path 120. When the input end of the first switch path 120 is conducted with the first output end of the first switch path 120, the positive electrode of the current amplifier 110 is conducted with the positive electrode of the electric energy meter 300 to be tested, and when the input end of the first switch path 120 is conducted with the second output end of the first switch path 120, the positive electrode of the current amplifier 110 is conducted with the negative electrode of the electric energy meter 300 to be tested.

[0087] The input end of the second switch path 130 is connected to the positive and negative electrodes of the current amplifier 110. The second switch path 130 includes two output ends. The second switch path 130 can be controlled to switch the conduction state between the input end and the two output ends, that is, the input end of the second switch path 130 can be conducted with the first output end of the second switch path 130, and the input end of the second switch path 130 can also be conducted with the second output end of the second switch path 130. When the input end of the second switch path 130 is conducted with the first output end of the second switch path 130, the negative electrode of the current amplifier 110 is conducted with the positive electrode of the electric energy meter 300 to be tested, and when the input end of the second switch path 130 is conducted with the second output end of the second switch path 130, the negative electrode of the current amplifier 110 is conducted with the negative electrode of the electric energy meter 300 to be tested.

[0088] Figure 4 FIG. 4 is a schematic diagram showing a forward current output to an electric energy meter 300 to be tested provided in some embodiments of the present application. Figure 4 As shown, the input end of the first switch path 120 is connected to the first output end, and the input end of the second switch path 130 is connected to the second output end. At this time, the positive pole of the current amplifier 110 is connected to the positive pole of the electric energy meter 300 to be tested, and the negative pole of the current amplifier 110 is connected to the negative pole of the electric energy meter 300 to be tested. Figure 4 The middle dashed line A and dashed line A' show the conduction path of the forward current.

[0089] Figure 5 FIG. 1 shows a schematic diagram of outputting a reverse current to an electric energy meter 300 to be tested provided in some embodiments of the present application, such as Figure 5 As shown, the input end of the first switch path 120 is connected to the second output end, and the input end of the second switch path 130 is connected to the first output end. At this time, the positive pole of the current amplifier 110 is connected to the negative pole of the electric energy meter 300 to be tested, and the negative pole of the current amplifier 110 is connected to the positive pole of the electric energy meter 300 to be tested. Figure 5 The middle dashed line B and dashed line B' show the conduction path of the reverse current.

[0090] Figure 4 and Figure 5 The I+ represents the positive electrode and the I- represents the negative electrode.

[0091] In combination with the above content, it can be seen that the first switch path 120 is used to control the on-off state between the positive pole of the current amplifier 110 and the positive and negative poles of the electric energy meter 300 to be tested, and the second switch path 130 is used to control the on-off state between the negative pole of the current amplifier 110 and the positive and negative poles of the electric energy meter 300 to be tested. By coordinating the actions of controlling the first switch path 120 and the second switch path 130, the current direction transmitted from the current amplifier 110 to the electric energy meter 300 to be tested can be adjusted, thereby realizing the switching of the current direction input into the electric energy meter 300 to be tested.

[0092] In this embodiment, the commutation device 100 of the electric energy meter further includes a control circuit 150, which is connected to the control ends of the first switch path 120 and the second switch path 130 respectively, and the actions of the first switch path 120 and the second switch path 130 can be controlled by the control circuit 150. It can be understood that the commutation test system 200 includes a host computer 201, and the host computer 201 can transmit a control signal to the control circuit 150, thereby triggering the control circuit 150 to control the first switch path 120 and the second switch path 130.

[0093] Exemplarily, the switch assembly 140 includes a first switch path 120 and a second switch path 130. The first switch path 120 may include a combination of multiple switch components, and the second switch path 130 may also include a combination of multiple switch components. The control circuit 150 is used to transmit an action signal to the combination of multiple switch components, and the combination of multiple switch components performs an on-off switching action in response to the action signal. For example, the switch component in the switch assembly 140 may be at least one or a combination of a solid-state relay, an IGBT (Insulate-Gate Bipolar Transistor), and a MOS (Metal Oxide Semiconductor Field Effect Transistor).

[0094] In the embodiment of the present application, a switch component 140 including a first switch path 120 and a second switch path 130 is arranged between the current amplifier 110 and the electric energy meter 300 to be tested. There is no need to change the internal circuit of the current amplifier 110, so that the commutation circuit can adapt to most current amplifiers 110, reducing the production design cost of the commutation test system 200. During the process of the commutation circuit commutating the current, the saturation voltage drop of the switch component 140 is small, and the current commutation speed is fast, which can meet the rapid change of the direction of the large current in the electric energy meter 300 to be tested. The absolute value of the current commutation will not change after switching, and the current output is more stable. During the current commutation process, there is no need to change the output action of the current amplifier 110, which solves the problem of damage to the current amplifier 110 caused by magnetic saturation of the output transformer in the current amplifier 110.

[0095] like Figure 2 As shown, in some embodiments, optionally, the first switch path 120 includes: a first switch group K1, a first end of the first switch group K1 is connected to the positive pole of the current amplifier 110, a second end of the first switch group K1 is connected to the positive pole of the electric energy meter 300 to be tested, and a control end of the first switch group K1 is connected to the control circuit 150; a second switch group K2, a first end of the second switch group K2 is connected to the positive pole of the current amplifier 110, a second end of the second switch group K2 is connected to the negative pole of the electric energy meter 300 to be tested, and a control end of the second switch group K2 is connected to the control circuit 150.

[0096] In this embodiment, the first switch path 120 includes a first switch group K1 and a second switch group K2. The first switch group K1 is connected between the positive pole of the current amplifier 110 and the positive pole of the electric energy meter 300 to be tested. By controlling the on-off state of the first switch group K1, the on-off state between the positive pole of the current amplifier 110 and the positive pole of the electric energy meter 300 to be tested can be controlled. The second switch group K2 is connected between the positive pole of the current amplifier 110 and the negative pole of the electric energy meter 300 to be tested. By controlling the on-off state of the second switch group K2, the on-off state between the positive pole of the current amplifier 110 and the negative pole of the electric energy meter 300 to be tested can be controlled. It should be noted that one of the first switch group K1 and the second switch group K2 is turned on and the other is turned off.

[0097] like Figure 4 and Figure 5 As shown, when transmitting a forward current to the electric energy meter 300 to be tested, the first switch group K1 is in an on state, and the second switch group K2 is in an off state, and the positive electrode of the current amplifier 110 is connected to the positive electrode of the electric energy meter 300 to be tested. When transmitting a reverse current to the electric energy meter 300 to be tested, the first switch group K1 is in an off state, and the second switch group K2 is in an on state, and the positive electrode of the current amplifier 110 is connected to the negative electrode of the electric energy meter 300 to be tested.

[0098] Exemplarily, the first switch group K1 is a normally closed switch, and / or the second switch group K2 is a normally open switch. When the first switch group K1 is a normally closed switch and the second switch group K2 is a normally open switch, the first switch path 120 can output a forward current in an uncontrolled initial state.

[0099] It should be noted that the first switch group K1 and the second switch group K2 may include one or more switch devices, which are not specifically limited here.

[0100] In the embodiment of the present application, two parallel first switch groups K1 and second switch groups K2 are arranged in the first switch path 120, and the control ends of the first switch group K1 and the second switch group K2 are respectively connected to the control circuit 150, so that the control circuit 150 can control the first switch group K1 and the second switch group K2 separately, so as to quickly switch the current direction output to the electric energy meter 300 to be tested. Since the current switching action is realized by the action of the first switch path 120 and the second switch path 130 at the rear end of the current amplifier 110, the transformer end current in the current amplifier 110 will not alternate between positive and negative directions, thereby solving the problem of magnetic saturation of the transformer due to possible current superposition.

[0101] like Figure 3 As shown, in some embodiments, optionally, the first switch path 120 includes:

[0102] The first single-pole double-throw switch SPDT1, the moving contact of the first single-pole double-throw switch SPDT1 is connected to the positive pole of the current amplifier 110, the first static contact of the first single-pole double-throw switch SPDT1 is connected to the positive pole of the electric energy meter 300 to be tested, the second static contact of the first single-pole double-throw switch SPDT1 is connected to the negative pole of the electric energy meter 300 to be tested, and the control end of the first single-pole double-throw switch SPDT1 is connected to the control circuit 150.

[0103] In this embodiment, the first switch path 120 includes a first single-pole double-throw switch SPDT1, and the first single-pole double-throw switch SPDT1 includes a moving contact and two stationary contacts, the first stationary contact of the two stationary contacts is connected to the positive pole of the electric energy meter 300 to be tested, the second stationary contact is connected to the negative pole of the electric energy meter 300 to be tested, and the moving contact is connected to the positive pole of the current amplifier 110. By selecting to connect the moving contact of the first single-pole double-throw switch SPDT1 to the first stationary contact or the second stationary contact, the positive pole of the current amplifier 110 is selectively connected to the positive pole or the negative pole of the electric energy meter 300 to be tested.

[0104] Specifically, when transmitting a forward current to the electric energy meter 300 to be tested, the moving contact of the first single-pole double-throw switch SPDT1 is connected to the first static contact, and the positive electrode of the current amplifier 110 is connected to the positive electrode of the electric energy meter 300 to be tested. When transmitting a reverse current to the electric energy meter 300 to be tested, the moving contact of the first single-pole double-throw switch SPDT1 is connected to the second static contact, and the positive electrode of the current amplifier 110 is connected to the negative electrode of the electric energy meter 300 to be tested.

[0105] In the embodiment of the present application, a first single-pole double-throw switch SPDT1 is set in the first switch path 120, and the moving contact of the first single-pole double-throw switch SPDT1 is connected to the positive pole of the current amplifier 110, and the first static contact and the second static contact of the first single-pole double-throw switch SPDT1 are respectively connected to the positive pole and the negative pole of the electric energy meter 300 to be tested. That is, the control circuit 150 can switch and control the conduction state between the positive and negative poles of the electric energy meter 300 to be tested and the positive pole of the current amplifier 110 by controlling the first single-pole double-throw switch SPDT1, thereby further improving the response speed of the first switch path 120.

[0106] like Figure 2 As shown, in some embodiments, optionally, the second switch path 130 includes:

[0107] A third switch group K3, wherein a first end of the third switch group K3 is connected to the negative electrode of the current amplifier 110, a second end of the third switch group K3 is connected to the positive electrode of the electric energy meter 300 to be tested, and a control end of the third switch group K3 is connected to the control circuit 150;

[0108] The fourth switch group K4 , the first end of the fourth switch group K4 is connected to the negative electrode of the current amplifier 110 , the second end of the fourth switch group K4 is connected to the negative electrode of the electric energy meter 300 to be tested, and the control end of the fourth switch group K4 is connected to the control circuit 150 .

[0109] In this embodiment, the second switch path 130 includes a third switch group K3 and a fourth switch group K4. The third switch group K3 is connected between the negative electrode of the current amplifier 110 and the positive electrode of the electric energy meter 300 to be tested. By controlling the on-off state of the third switch group K3, the on-off state between the negative electrode of the current amplifier 110 and the positive electrode of the electric energy meter 300 to be tested can be controlled. The fourth switch group K4 is connected between the negative electrode of the current amplifier 110 and the negative electrode of the electric energy meter 300 to be tested. By controlling the on-off state of the fourth switch group K4, the on-off state between the negative electrode of the current amplifier 110 and the negative electrode of the electric energy meter 300 to be tested can be controlled. It should be noted that one of the third switch group K3 and the fourth switch group K4 is turned on, and the other is turned off.

[0110] like Figure 4 and Figure 5 As shown, when a reverse current is transmitted to the electric energy meter 300 to be tested, the third switch group K3 is in the on state, and the fourth switch group K4 is in the off state, and the negative electrode of the current amplifier 110 is connected to the positive electrode of the electric energy meter 300 to be tested. When a forward current is transmitted to the electric energy meter 300 to be tested, the third switch group K3 is in the off state, and the fourth switch group K4 is in the on state, and the negative electrode of the current amplifier 110 is connected to the negative electrode of the electric energy meter 300 to be tested.

[0111] Exemplarily, the third switch group K3 is a normally closed switch, and / or the fourth switch group K4 is a normally open switch. When the third switch group K3 is a normally closed switch and the fourth switch group K4 is a normally open switch, the second switch path 130 can output a forward current in an uncontrolled initial state.

[0112] It should be noted that the third switch group K3 and the fourth switch group K4 may include one or more switch devices, which are not specifically limited here.

[0113] In the embodiment of the present application, two parallel third switch groups K3 and fourth switch groups K4 are arranged in the second switch path 130, and the control ends of the third switch group K3 and the fourth switch group K4 are respectively connected to the control circuit 150, so that the control circuit 150 can control the third switch group K3 and the fourth switch group K4 individually, so as to quickly switch the current direction output to the electric energy meter 300 to be tested. Since the current switching action is realized by the action of the first switch path 120 and the second switch path 130 at the rear end of the current amplifier 110, the transformer end current in the current amplifier 110 will not alternate between positive and negative directions, thereby solving the problem of magnetic saturation of the transformer due to possible current superposition.

[0114] like Figure 3 As shown, in some embodiments, optionally, the second switch path 130 includes:

[0115] The second single-pole double-throw switch SPDT2, the moving contact of the second single-pole double-throw switch SPDT2 is connected to the negative pole of the current amplifier 110, the first static contact of the second single-pole double-throw switch SPDT2 is connected to the positive pole of the electric energy meter 300 to be tested, the second static contact of the second single-pole double-throw switch SPDT2 is connected to the negative pole of the electric energy meter 300 to be tested, and the control end of the second single-pole double-throw switch SPDT2 is connected to the control circuit 150.

[0116] In this embodiment, the second switch path 130 includes a second single-pole double-throw switch SPDT2, and the second single-pole double-throw switch SPDT2 includes a moving contact and two stationary contacts, the first stationary contact of the two stationary contacts is connected to the positive electrode of the electric energy meter 300 to be tested, the second stationary contact is connected to the negative electrode of the electric energy meter 300 to be tested, and the moving contact is connected to the negative electrode of the current amplifier 110. By selecting to connect the moving contact of the second single-pole double-throw switch SPDT2 to the first stationary contact or the second stationary contact, the negative electrode of the current amplifier 110 is selectively connected to the positive electrode or the negative electrode of the electric energy meter 300 to be tested.

[0117] Specifically, when transmitting a forward current to the electric energy meter 300 to be tested, the moving contact of the second single-pole double-throw switch SPDT2 is connected to the second static contact, and the negative electrode of the current amplifier 110 is connected to the negative electrode of the electric energy meter 300 to be tested. When transmitting a reverse current to the electric energy meter 300 to be tested, the moving contact of the second single-pole double-throw switch SPDT2 is connected to the first static contact, and the negative electrode of the current amplifier 110 is connected to the positive electrode of the electric energy meter 300 to be tested.

[0118] In the embodiment of the present application, a second single-pole double-throw switch SPDT2 is set in the second switch path 130, and the moving contact of the second single-pole double-throw switch SPDT2 is connected to the negative pole of the current amplifier 110, and the first static contact and the second static contact of the second single-pole double-throw switch SPDT2 are respectively connected to the positive pole and the negative pole of the electric energy meter 300 to be tested. That is, the control circuit 150 can switch and control the conduction state between the positive and negative poles of the electric energy meter 300 to be tested and the negative pole of the current amplifier 110 by controlling the second single-pole double-throw switch SPDT2, thereby further improving the response speed of the second switch path 130.

[0119] In some embodiments, optionally, the first switch path 120 and the second switch path 130 include at least one of the following or a combination thereof: a solid-state relay, a MOS tube, and an IGBT tube.

[0120] In the embodiment of the present application, the first switch path 120 and the second switch path 130 can be constructed using at least one electronic control device selected from the group consisting of a solid-state relay, a MOS tube, and an IGBT tube. Compared with ordinary relays or mechanical switches in the related art, they have the advantages of faster response speed and longer service life, and do not generate noise when operating. Since the commutation circuit is arranged in the commutation test system 200, it is necessary to frequently switch the current direction of the electric energy meter 300 to be tested. Therefore, the service life and quietness of the commutation test system 200 can be improved.

[0121] In some embodiments, optionally, the output current of the current amplifier 110 has a value range of greater than 0A and less than 200A; and / or the output voltage of the current amplifier 110 has a value range of greater than 0V and less than 100V.

[0122] In the embodiment of the present application, the value range of the output current of the current amplifier 110 is set to be greater than 0A and less than 200A, so that the commutation circuit can be applicable to the test scenario of current commutation in a wider current range. The value range of the output voltage of the current amplifier 110 is set to be greater than 0V and less than 100V, so that the commutation circuit can be applicable to the test scenario of current commutation in a wider voltage range.

[0123] In some embodiments, optionally, the on-off reaction time of the first switch path 120 and the second switch path 130 ranges from 1 ms to 5 ms.

[0124] In the embodiment of the present application, by setting the on-off reaction time of the first switch path 120 and the second switch path 130 to be greater than or equal to 1 ms and less than or equal to 5 ms, the direction of the current transmitted by the current amplifier 110 to the electric energy meter 300 to be tested can be switched at a faster conversion speed, thereby improving the accuracy and stability of the commutation test system 200 in testing the electric energy meter.

[0125] Figure 6 A schematic block diagram of a commutation test system 200 provided in some embodiments of the present application is shown. Figure 6 As shown, a commutation test system 200 according to some embodiments of the present application includes: the commutation device 100 of the electric energy meter in any of the above embodiments; and a host computer 201, wherein the signal output end of the host computer 201 is connected to the control circuit 150 in the commutation device 100 of the electric energy meter. Therefore, all the beneficial effects of the commutation device 100 of the electric energy meter in any of the above embodiments are not described one by one here.

[0126] Exemplarily, the host computer 201 is deployed with test software, and the host computer 201 controls the control circuit 150 in the commutation device 100 of the electric energy meter by running the test software, so that the control circuit 150 can control the on / off state of the first switch path 120 and the second switch path 130 .

[0127] Figure 7 A flow chart of a commutation test method provided in some embodiments of the present application is shown. Figure 7 As shown, according to a commutation test method of some embodiments of the present application, applied to the commutation device of the electric energy meter in any of the above embodiments, the commutation test method includes:

[0128] Step 702, when the current power amplifier is running, alternately transmitting a first control signal and a second control signal to the control circuit;

[0129] The first control signal is used to trigger the control circuit to control the input end of the first switch path to be connected to the first output end, and the input end of the second switch path to be connected to the second output end, and the second control signal is used to trigger the control circuit to control the input end of the first switch path to be connected to the second output end, and the input end of the second switch path to be connected to the first output end;

[0130] In this embodiment, at the beginning stage of the commutation test on the electric energy meter to be tested, the control current amplifier starts to run and alternately transmits the first control signal and the second control signal to the control circuit in the commutation device of the electric energy meter, that is, in the same time period, only one of the first control signal or the second control signal is transmitted to the control circuit.

[0131] When receiving the first control signal, the control circuit controls the input end of the first switch path to be connected with the first output end, and controls the input end of the second switch path to be connected with the second output end. At this time, the positive pole of the current amplifier is connected with the positive pole of the electric energy meter to be tested, and the negative pole of the current amplifier is connected with the negative pole of the electric energy meter to be tested, thereby transmitting a forward current to the electric energy meter to be tested.

[0132] When receiving the second control signal, the control circuit controls the input end of the first switch path to be connected with the second output end, and controls the input end of the second switch path to be connected with the first output end. At this time, the positive pole of the current amplifier is connected with the negative pole of the electric energy meter to be tested, and the negative pole of the current amplifier is connected with the positive pole of the electric energy meter to be tested, thereby transmitting reverse current to the electric energy meter to be tested.

[0133] Specifically, the commutation test method is executed by the host computer. When the control circuit receives the control signal transmitted by the host computer, the control signal received this time is compared with the control signal received last time. If the control signals received twice are the same, the drive signal transmitted to the first switch path and the second switch path is kept unchanged; if the control signals received twice are different, the drive signal to the first switch path and the second switch path is adjusted, thereby changing the direction of the current transmitted to the electric energy meter to be tested.

[0134] Step 704, timing the total transmission duration of the first control signal and the second control signal;

[0135] Step 706: When the total transmission time reaches a preset time, the current amplifier is controlled to stop running.

[0136] In this embodiment, in the process of alternately transmitting the first control signal and the second control signal to the control circuit, the total transmission time of the first control signal and the second control signal to the control circuit is timed. When the timing reaches a preset time, it is determined that the commutation test is completed. At this time, the control current amplifier stops running and no longer transmits current to the electric energy meter to be tested, and stops transmitting the first control signal or the second control signal to the control circuit, so that the first switch path and the second switch path return to their initial states.

[0137] Exemplarily, the total transmission duration ranges from 3 hours to 5 hours.

[0138] In the embodiment of the present application, a switch component including a first switch path and a second switch path is arranged between the current amplifier and the electric energy meter to be tested. There is no need to change the internal circuit of the current amplifier, so that the commutation circuit can adapt to most current amplifiers, reducing the production design cost of the commutation test system. In the process of the commutation circuit commutating the current, the saturation voltage drop of the switch component is small, and the current commutation speed is fast, which can meet the rapid change of the direction of large current in the electric energy meter to be tested. The absolute value of the current after commutation switching will not change, and the current output is more stable. There is no need to change the output action of the current amplifier during the current commutation process, which solves the problem of damage to the current amplifier caused by magnetic saturation of the output transformer in the current amplifier.

[0139] In an embodiment of the present application, by alternately transmitting the first control signal and the second control signal to the control circuit, the direction of the current transmitted to the electric energy meter to be tested can be alternately switched through the control circuit, and the test process can be timed, and the test can be automatically stopped after the timing is completed, thereby further simplifying the operating steps of the tester.

[0140] In some embodiments, optionally, alternately transmitting the first control signal and the second control signal to the control circuit includes: transmitting the first control signal to the control circuit until a first time duration is reached; transmitting the second control signal to the control circuit until a second time duration is reached, and returning to execute the step of transmitting the first control signal to the control circuit.

[0141] In this embodiment, in the process of alternately transmitting the first control signal and the second control signal to the control circuit, the first control signal is first transmitted to the control circuit, thereby transmitting a forward current to the electric energy meter to be tested, and the duration of the forward current transmission to the electric energy meter to be tested is timed. When the timing reaches the first duration, the second control signal is started to be transmitted to the control circuit, thereby transmitting a reverse current to the electric energy meter to be tested, and the duration of the reverse current transmission to the electric energy meter to be tested is timed. When the timing reaches the second duration, the step of transmitting the first control signal is returned to achieve alternating switching of the current direction in the electric energy meter to be tested.

[0142] Exemplarily, the value range of the first duration is 3 seconds to 10 seconds, specifically 5 seconds, and the value range of the second duration is 3 seconds to 10 seconds, specifically 5 seconds.

[0143] In an embodiment of the present application, in the process of transmitting a control signal to a control circuit, by timing the duration of transmitting the first control signal and the duration of transmitting the second control signal, and switching the transmitted first control signal and the second control signal according to the timing result, it is possible to automatically alternately switch the direction of the current transmitted to the electric energy meter to be tested, thereby further simplifying the operating steps.

[0144] In some embodiments, optionally, the first duration is the same as the second duration.

[0145] In an embodiment of the present application, by setting the first duration of transmitting the first control signal to the control circuit and the second duration of transmitting the second control signal to the control circuit to be equal during the commutation test, it can be ensured that the duration of the forward current passing through the electric energy meter is equal to the duration of the reverse current passing through, thereby improving the accuracy of the commutation test process.

[0146] For example, during the reversing test of the rapid change of flow direction test of the electric energy meter, the nominal voltage is applied to the electric energy meter with a power factor of 1; the circuit of the electric energy meter should repeatedly switch between the forward and reverse current flow directions, applying 10Itr during the forward period and 10Itr of the opposite current direction during the reverse period; the forward period lasts for 5 seconds, the reverse period lasts for 5 seconds, and the total test time is 4 hours. The forward time and reverse time of the current do not need to be synchronized with the zero crossing point of the grid frequency. The switching between the forward and reverse states of the current should be completed within one cycle of the nominal frequency; the tolerance of the forward current duration and the reverse current duration is ±1 cycle of the nominal frequency. The accuracy is obtained by reading the precise electric energy of the electric energy meter before and after the test and comparing the calculated electric energy change value with the standard electric energy change value, and the forward and reverse errors should be calculated separately.

[0147] According to one embodiment of the present application, Figure 8 One of the structural block diagrams of a commutation test device provided in some embodiments of the present application is shown. Figure 8 As shown, a commutation test device is proposed, which is applied to the commutation device of the electric energy meter in any of the above embodiments. The commutation test device 800 includes:

[0148] The transmission module 802 is used to alternately transmit a first control signal and a second control signal to the control circuit when the current power amplifier is running, wherein the first control signal is used to trigger the control circuit to control the input end of the first switch path to be connected to the first output end, and the input end of the second switch path to be connected to the second output end, and the second control signal is used to trigger the control circuit to control the input end of the first switch path to be connected to the second output end, and the input end of the second switch path to be connected to the first output end;

[0149] A timing module 804, used to time the total transmission time of the first control signal and the second control signal;

[0150] The control module 806 is used to control the current amplifier to stop running when the total transmission time reaches a preset time.

[0151] In the embodiment of the present application, a switch component including a first switch path and a second switch path is arranged between the current amplifier and the electric energy meter to be tested. There is no need to change the internal circuit of the current amplifier, so that the commutation circuit can adapt to most current amplifiers, reducing the production design cost of the commutation test system. In the process of the commutation circuit commutating the current, the saturation voltage drop of the switch component is small, and the current commutation speed is fast, which can meet the rapid change of the direction of large current in the electric energy meter to be tested. The absolute value of the current after commutation switching will not change, and the current output is more stable. There is no need to change the output action of the current amplifier during the current commutation process, which solves the problem of damage to the current amplifier caused by magnetic saturation of the output transformer in the current amplifier.

[0152] In an embodiment of the present application, by alternately transmitting the first control signal and the second control signal to the control circuit, the direction of the current transmitted to the electric energy meter to be tested can be alternately switched through the control circuit, and the test process can be timed, and the test can be automatically stopped after the timing is completed, thereby further simplifying the operating steps of the tester.

[0153] In some embodiments, optionally, the transmission module 802 is used to transmit a first control signal to the control circuit until a first time duration is reached; the transmission module 802 is used to transmit a second control signal to the control circuit until a second time duration is reached, and returns to execute the step of transmitting the first control signal to the control circuit.

[0154] In an embodiment of the present application, in the process of transmitting a control signal to a control circuit, by timing the duration of transmitting the first control signal and the duration of transmitting the second control signal, and switching the transmitted first control signal and the second control signal according to the timing result, it is possible to automatically alternately switch the direction of the current transmitted to the electric energy meter to be tested, thereby further simplifying the operating steps.

[0155] In some embodiments, optionally, the first duration is the same as the second duration.

[0156] In an embodiment of the present application, by setting the first duration of transmitting the first control signal to the control circuit and the second duration of transmitting the second control signal to the control circuit to be equal during the commutation test, it can be ensured that the duration of the forward current passing through the electric energy meter is equal to the duration of the reverse current passing through, thereby improving the accuracy of the commutation test process.

[0157] According to one embodiment of the present application, Fig. 9 FIG. 2 shows a second structural block diagram of a commutation test device provided in some embodiments of the present application. Fig. 9 As shown, the commutation test device 900 includes a processor 902 and a memory 904. The memory 904 stores a program or instruction. When the program or instruction is executed by the processor 902, the steps of the commutation test method in any of the above embodiments are implemented. Therefore, the commutation test device 900 has all the beneficial effects of the commutation test method in any of the above embodiments, which will not be described in detail.

[0158] According to one embodiment of the present application, optionally, a readable storage medium is provided, on which a program or instruction is stored. When the program or instruction is executed by a processor, the steps of the commutation test method in any of the above embodiments are implemented, thereby having all the beneficial technical effects of the commutation test method in any of the above embodiments.

[0159] The readable storage medium includes a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0160] A computer readable storage medium may be a tangible device that can retain and store instructions for use by an instruction execution device. A computer readable storage medium may be an electronic storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination of the above devices, but is not limited thereto. A non-exhaustive list of more specific examples of computer readable storage media includes: portable computer floppy disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), static random access memory (SRAM), portable compact disk read-only memory (CD-ROM), digital versatile disk (DVD), memory card, floppy disk, encoding mechanical device (such as a punch card or a groove with a raised structure with instructions recorded) and any suitable combination of the above devices. The computer readable storage medium used herein should not be understood as a transmission signal itself, such as a radio wave or other freely propagating electromagnetic wave, an electromagnetic wave propagating through a waveguide or other transmission medium, or an electrical signal transmitted through a wire, etc.

[0161] In this application, the term "plurality" means two or more than two, unless otherwise clearly defined. The terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0162] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. The above description is only a preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A commutation device for an electric energy meter, characterized in that: Applied to a commutation test system, the commutation test system is used to test an electric energy meter to be tested, and the electric energy meter commutation device comprises: Current amplifier; a first switch path, wherein an input end of the first switch path is connected to the positive electrode of the current amplifier, a first output end of the first switch path is connected to the positive electrode of the electric energy meter to be tested, and a second output end of the first switch path is connected to the negative electrode of the electric energy meter to be tested; a second switch path, wherein an input end of the second switch path is connected to the negative electrode of the current amplifier, a first output end of the second switch path is connected to the positive electrode of the electric energy meter to be tested, and a second output end of the second switch path is connected to the negative electrode of the electric energy meter to be tested; A control circuit, wherein the control circuit is connected to a control end of the first switch path and a control end of the second switch path, and the control circuit is used to control the input end of the first switch path to be conductive with the first output end or the second output end, and to control the input end of the second switch path to be conductive with the first output end or the second output end.

2. The commutation device of the electric energy meter according to claim 1, characterized in that: The first switch path comprises: A first switch group, wherein a first end of the first switch group is connected to the positive electrode of the current amplifier, a second end of the first switch group is connected to the positive electrode of the electric energy meter to be tested, and a control end of the first switch group is connected to the control circuit; A second switch group, wherein a first end of the second switch group is connected to the positive electrode of the current amplifier, a second end of the second switch group is connected to the negative electrode of the electric energy meter to be tested, and a control end of the second switch group is connected to the control circuit.

3. The commutation device of the electric energy meter according to claim 1, characterized in that: The first switch path includes: A first single-pole double-throw switch, wherein the moving contact of the first single-pole double-throw switch is connected to the positive pole of the current amplifier, the first static contact of the first single-pole double-throw switch is connected to the positive pole of the electric energy meter to be tested, the second static contact of the first single-pole double-throw switch is connected to the negative pole of the electric energy meter to be tested, and the control end of the first single-pole double-throw switch is connected to the control circuit.

4. The commutation device of the electric energy meter according to claim 1, characterized in that: The second switch path comprises: a third switch group, wherein a first end of the third switch group is connected to the negative electrode of the current amplifier, a second end of the third switch group is connected to the positive electrode of the electric energy meter to be tested, and a control end of the third switch group is connected to the control circuit; A fourth switch group, wherein a first end of the fourth switch group is connected to the negative electrode of the current amplifier, a second end of the fourth switch group is connected to the negative electrode of the electric energy meter to be tested, and a control end of the fourth switch group is connected to the control circuit.

5. The commutation device of the electric energy meter according to claim 1, characterized in that: The second switch path includes: A second single-pole double-throw switch, the moving contact of the second single-pole double-throw switch is connected to the negative pole of the current amplifier, the first static contact of the second single-pole double-throw switch is connected to the positive pole of the electric energy meter to be tested, the second static contact of the second single-pole double-throw switch is connected to the negative pole of the electric energy meter to be tested, and the control end of the second single-pole double-throw switch is connected to the control circuit.

6. The commutation device of an electric energy meter according to any one of claims 1 to 5, characterized in that: The first switch path and the second switch path include at least one of the following or a combination thereof: Solid-state relays, MOS tubes, IGBT tubes.

7. The commutation device of an electric energy meter according to any one of claims 1 to 5, characterized in that: The output current of the current amplifier has a value range of greater than 0A and less than 200A; and / or The output voltage of the current power amplifier has a value range of greater than 0V and less than 100V.

8. The commutation device of an electric energy meter according to any one of claims 1 to 5, characterized in that: The on-off reaction time of the first switch path and the second switch path ranges from 1 ms to 5 ms.

9. A commutation test system, characterized in that: include: An electric energy meter commutation device as claimed in any one of claims 1 to 8; A host computer, wherein a signal output terminal of the host computer is connected to a control circuit in the commutation device of the electric energy meter.

10. A commutation test method, characterized in that: The commutation device of the electric energy meter applied to any one of claims 1 to 8, wherein the commutation test method comprises: When the current power amplifier is running, a first control signal and a second control signal are alternately transmitted to the control circuit, wherein the first control signal is used to trigger the control circuit to control the input end of the first switch path to be connected to the first output end, and the input end of the second switch path to be connected to the second output end, and the second control signal is used to trigger the control circuit to control the input end of the first switch path to be connected to the second output end, and the input end of the second switch path to be connected to the first output end; Timing the total transmission duration of the first control signal and the second control signal; When the total transmission duration reaches a preset duration, the current power amplifier is controlled to stop running.

11. The commutation test method according to claim 10, characterized in that: The alternately transmitting the first control signal and the second control signal to the control circuit comprises: transmitting the first control signal to the control circuit until a first duration is reached; The second control signal is transmitted to the control circuit until a second time period is reached, and the step of transmitting the first control signal to the control circuit is returned to be executed.

12. The commutation test method according to claim 11, characterized in that: The first duration is the same as the second duration.

13. A commutation test device, characterized in that: The commutation device of an electric energy meter applied to any one of claims 1 to 8, the commutation test device comprising: A transmission module, used for alternately transmitting a first control signal and a second control signal to the control circuit when the current power amplifier is running, wherein the first control signal is used to trigger the control circuit to control the input end of the first switch path to be connected to the first output end, and the input end of the second switch path to be connected to the second output end, and the second control signal is used to trigger the control circuit to control the input end of the first switch path to be connected to the second output end, and the input end of the second switch path to be connected to the first output end; A timing module, used to time the total transmission duration of the first control signal and the second control signal; The control module is used to control the current power amplifier to stop running when the total transmission time reaches a preset time.

14. A commutation test device, characterized in that: include: processor; A memory, wherein a program or instruction is stored in the memory, and the processor implements the steps of the commutation test method according to any one of claims 10 to 12 when executing the program or instruction in the memory.

15. A readable storage medium, characterized in that: The readable storage medium stores a program or an instruction, and when the program or the instruction is executed by the processor, the steps of the commutation test method according to any one of claims 10 to 12 are implemented.

Images