Electric energy meter counting direction switching device and electric energy meter testing method

Abstract

The invention discloses an electric energy meter counting direction switching device and an electric energy meter testing method.The electric energy meter counting direction switching device comprises a switching module connected with a power supply end and an electric energy meter, and the switching module is configured to be switched between a first connection state and a second connection state; therefore, the flow direction of the current flowing to the electric energy meter is changed, and the counting direction of the electric energy meter is further switched. When the switching module is switched between the first connection state and the second connection state, the connection mode between the power supply end and the electric energy meter is changed, so that the flow direction of the current flowing to the electric energy meter is changed, rapid switching of the counting direction is realized, the switching speed is greatly improved, and the working efficiency is improved. The condition of reverse rapid sudden change of the current in the actual power utilization process can be simulated more truly, and the test reliability is improved.

Description

Technical Field

[0001] This application relates to the field of power technologies, and particularly to a device for switching the running direction of an electric energy meter and a method for testing an electric energy meter. Background Art

[0002] During daily power consumption, since there are cases where an AC motor is used as an electrical appliance, reverse power consumption may occur during its use. Under such working conditions, it is necessary to ensure the functional reliability and data correctness when the running direction of electric energy changes during the testing process of power metering devices including intelligent electric energy meters and measuring switches.

[0003] Currently, the mainstream verification method is to achieve the switching of the forward and reverse currents through a programmable power source device. However, this method of switching the running direction has the problems that when implementing, the current needs to be decreased to 0A and then increased in the reverse direction to the current value required for testing, resulting in a long switching time and the inability to simulate the rapid mutation of the current in actual applications, and there are testing defects. Summary of the Invention

[0004] In view of the above problems, this application provides a device for switching the running direction of an electric energy meter and a method for testing an electric energy meter to solve the above technical problems.

[0005] In a first aspect, this application provides a device for switching the running direction of an electric energy meter. The device for switching the running direction of an electric energy meter includes a switching module respectively connected to a power supply end and an electric energy meter. The switching module is configured to switch between a first connection state and a second connection state to change the flowing direction of the current flowing into the electric energy meter, thereby switching the running direction of the electric energy meter.

[0006] In a possible implementation manner of this application, the switching module includes a gating unit. The gating unit includes a common terminal group, a first contact terminal group, and a second contact terminal group. The gating unit is used to selectively connect the common terminal group to the first contact terminal group or the second contact terminal group according to a control signal, so that the current selectively flows into the electric energy meter through a first current port or a second current port of the electric energy meter, realizing the switching of the running direction of the electric energy meter.

[0007] In a possible implementation manner of the present application, the electricity meter is a single-phase electricity meter. The common terminal group includes a first common terminal and a second common terminal. The first contact terminal group includes a first contact terminal and a second contact terminal. The second contact terminal group includes a third contact terminal and a fourth contact terminal. The first contact terminal and the fourth contact terminal are respectively connected to the first current port of the electricity meter. The second contact terminal and the third contact terminal are respectively connected to the second current port of the electricity meter. When the first common terminal is connected to the first contact terminal and the second common terminal is connected to the second contact terminal, the current flows into the electricity meter through the first current port of the electricity meter, causing the electricity meter to run forward. When the first common terminal is connected to the third contact terminal and the second common terminal is connected to the fourth contact terminal, the current flows into the electricity meter through the second current port of the electricity meter, causing the electricity meter to run backward.

[0008] In a possible implementation manner of the present application, the electricity meter is a three-phase electricity meter. The switching module further includes a first switch unit and a second switch unit. The first switch unit is configured to be powered on and operate when the common terminal group is connected to the first contact terminal group, so that the current flows into the electricity meter through the first current port of the target phase of the electricity meter, realizing the forward running of the electricity meter. The second switch unit is configured to be powered on and operate when the common terminal group is connected to the second contact terminal group, so that the current flows into the electricity meter through the second current port of the target phase of the electricity meter, realizing the reverse running of the electricity meter.

[0009] In a possible implementation manner of the present application, the power supply terminal of the first switch unit is connected to the first contact terminal group. The first output terminal of the first switch unit is connected to the first current port of the target phase of the electricity meter. The second output terminal of the first switch unit is connected to the second current port of the target phase of the electricity meter. The power supply terminal of the second switch unit is connected to the second contact terminal group. The first output terminal of the second switch unit is connected to the second current port of the target phase of the electricity meter. The second output terminal of the second switch unit is connected to the first current port of the target phase of the electricity meter.

[0010] In a possible implementation manner of the present application, the electricity meter is a three-phase electricity meter. The switching module further includes a first switch group and a second switch group. The first switch group is configured to be powered on and operate when the common terminal group is connected to the first contact terminal group, so that the current flows into the electricity meter through the first current port of each phase of the electricity meter, realizing the forward running of the electricity meter. The second switch group is configured to be powered on and operate when the common terminal group is connected to the second contact terminal group, so that the current flows into the electricity meter through the second current port of each phase of the electricity meter, realizing the reverse running of the electricity meter.

[0011] In a possible implementation manner of the present application, the first switch group includes a first switch component and a second switch component. The power supply terminals of the first switch component and the second switch component are respectively connected to the first contact terminal group. The three output terminals of the first switch component are respectively and correspondingly connected to the first current ports of the A-phase, B-phase, and C-phase of the electricity meter. The three output terminals of the second switch component are respectively and correspondingly connected to the second current ports of the A-phase, B-phase, and C-phase of the electricity meter. The second switch group includes a third switch component and a fourth switch component. The power supply terminals of the third switch component and the fourth switch component are respectively connected to the second contact terminal group. The three output terminals of the third switch component are respectively and correspondingly connected to the second current ports of the A-phase, B-phase, and C-phase of the electricity meter. The three output terminals of the fourth switch component are respectively and correspondingly connected to the first current ports of the A-phase, B-phase, and C-phase of the electricity meter.

[0012] In a second aspect, the present application further provides a method for testing an electricity meter, and the method includes:

[0013] Controlling the switching module of the electricity meter running direction switching device in any possible implementation manner of the first aspect to be in the first connection state, and recording the flashing times of the active power pulse indicator of the electricity meter and the first pulse number; when the first cumulative flashing times reach a preset number, recording the current first pulse number, and switching the switching module to the second connection state, and re-recording the flashing times of the active power pulse indicator of the electricity meter and the second pulse number; when the second cumulative flashing times reach the preset number, recording the current second pulse number; determining the reliability of the electricity meter according to the current first pulse number and the current second pulse number.

[0014] In a possible implementation manner of the present application, determining the reliability of the electricity meter according to the current first pulse number and the current second pulse number includes: controlling the electricity meter running direction switching device to be electrically disconnected from the electricity meter, and after the electricity meter is powered on again, obtaining the total forward active power and the total reverse active power of the electricity meter; determining the reliability of the electricity meter according to the current first pulse number and the total forward active power and the current second pulse number and the total reverse active power.

[0015] In a possible implementation manner of the present application, determining the reliability of the electricity meter according to the current first pulse number and the total forward active power and the current second pulse number and the total reverse active power includes: obtaining the forward electric energy when the electricity meter runs forward according to the active power pulse constant of the electricity meter and the current first pulse number, and obtaining the reverse electric energy when the electricity meter runs backward according to the active power pulse constant and the current second pulse number; if the forward electric energy is the same as the total forward active power, and the reverse electric energy is the same as the total reverse active power, the test passes, and it is determined that the electricity meter is reliable.

[0016] From the above content, it can be concluded that the present application has the following beneficial effects:

[0017] In this application, a switching module is respectively connected to a power supply terminal and a watt-hour meter. When the switching module switches between a first connection state and a second connection state, the connection mode between the power supply terminal and the watt-hour meter changes, so that the direction of the current flowing into the watt-hour meter can be changed, realizing the switching of the running direction of the watt-hour meter. Compared with the related technology that realizes the switching of the running direction by reducing the current to 0A and then reversing the current increase, in this application, the switching module directly changes the current direction, realizing the rapid switching of the running direction, greatly improving the switching speed, and being able to more realistically simulate the rapid mutation of the current in the actual power consumption process, improving the test reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of this application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of this application. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0019] Figure 1 It is a schematic diagram of a module of a device for switching the running direction of a watt-hour meter provided in an embodiment of this application;

[0020] Figure 2 It is a schematic diagram of the structure of a switching module provided in an embodiment of this application;

[0021] Figure 3 It is the first wiring schematic diagram of the switching module provided in an embodiment of this application;

[0022] Figure 4 It is the second wiring schematic diagram of the switching module provided in an embodiment of this application;

[0023] Figure 5 It is another schematic diagram of the structure of the switching module provided in an embodiment of this application;

[0024] Figure 6 It is the third wiring schematic diagram of the switching module provided in an embodiment of this application;

[0025] Figure 7 It is the fourth wiring schematic diagram of the switching module provided in an embodiment of this application;

[0026] Figure 8 It is another schematic diagram of the structure of the switching module provided in an embodiment of this application;

[0027] Figure 9 It is the fifth wiring schematic diagram of the switching module provided in an embodiment of this application;

[0028] Figure 10 It is the sixth wiring schematic diagram of the switching module provided in the embodiments of the present application;

[0029] Figure 11 It is a schematic flowchart of a method for testing an electric energy meter provided in the embodiments of the present application. Detailed implementation manners

[0030] The following details the implementation manners of the present application. The examples of the implementation manners are shown in the accompanying drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The implementation manners described below with reference to the accompanying drawings are exemplary only for explaining the present application and should not be construed as a limitation to the present application.

[0031] In order to enable those skilled in the art to better understand the solution of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts fall within the scope of protection of the present application.

[0032] In the embodiments of the present application, it should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations.

[0033] Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that an article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such article or device. Without further limitation, the element defined by the statement "including a..." does not exclude the existence of another identical element in the article or device including the said element.

[0034] In the description of the embodiments of the present application, words such as "example" or "for example" are used to indicate exemplification, illustration or description. Any embodiment or design solution described as "for example" or "for instance" in the embodiments of the present application is not construed as being more preferred or having more advantages than another embodiment or design solution. The use of words such as "example" or "for example" is intended to present relative concepts in a clear manner.

[0035] In addition, "a plurality of" in the embodiments of the present application means two or more. In view of this, "a plurality of" in the embodiments of the present application can also be understood as "at least two". "At least one" can be understood as one or more, for example, understood as one, two or more. For example, including at least one means including one, two or more, and it does not limit which ones are included. For example, including at least one of A, B, and C, then what can be included are A, B, C, A and B, A and C, B and C, or A and B and C.

[0036] Next, the electric energy meter running direction switching device and the electric energy meter testing method provided by the present application will be described in detail respectively.

[0037] First, an embodiment of the present application provides an electric energy meter running direction switching device. Please refer to Figure 1 , Figure 1 which is a schematic diagram of a module of the electric energy meter running direction switching device provided in the embodiment of the present application. The electric energy meter running direction switching device 100 includes a switching module 110 respectively connected to a power supply end 200 and an electric energy meter 300. The switching module 110 is configured to switch between a first connection state and a second connection state to change the flowing direction of the current flowing into the electric energy meter 300, thereby switching the running direction of the electric energy meter 300.

[0038] In the embodiment of the present application, the power supply end 200 may be a mains output end. The switching module 110 is respectively connected to the power supply end 200 and the electric energy meter 300, and is configured with two connection states. Therefore, by changing the connection state of the switching module 110, the connection state between the power supply end 200 and the electric energy meter 300 can be changed, thereby changing the flowing direction of the current flowing into the electric energy meter 300 and realizing the rapid switching of the running direction.

[0039] Referring to Figure 1 for an example, the first connection state corresponds to a red wiring, and the second connection state corresponds to a green wiring. When the switching module 110 is in the first connection state, that is, connecting the power supply end 200 and the electric energy meter 300 according to the red wiring, the current from the power supply end 200 flows into the electric energy meter 300 from the first current port 1, and the electric energy meter 300 rotates forward to achieve forward running; when the switching module 110 is switched from the first connection state to the second connection state, that is, connecting the power supply end 200 and the electric energy meter 300 according to the green wiring, the current from the power supply end 200 flows into the electric energy meter 300 from the second current port 2. At this time, the electric energy meter 300 rotates in reverse to be switched to reverse running.

[0040] In the embodiments of the present application, the switching module 110 is respectively connected to the power supply terminal 200 and the electricity meter 300. When the switching module 110 switches between the first connection state and the second connection state, the connection mode between the power supply terminal 200 and the electricity meter 300 changes, so that the direction of the current flowing into the electricity meter 300 can be changed, and the switching of the running direction of the electricity meter 300 is realized; compared with the related art where the running direction is switched by reducing the current to 0 A and then increasing the current in the reverse direction, in the present application, the switching module 110 directly changes the current direction, realizing the rapid switching of the running direction, greatly improving the switching speed, and being able to more realistically simulate the rapid reverse mutation of the current in the actual power consumption process, improving the test reliability.

[0041] Next, continue to elaborate in detail on Figure 1 each unit module shown and the specific implementation manners that may be adopted in actual applications.

[0042] As Figure 2 shown, in some embodiments of the present application, the switching module 110 may include a gating unit 1101, and the gating unit 1101 may include a common terminal group 111, a first contact terminal group 112, and a second contact terminal group 113; the gating unit 1101 may be used to selectively connect the common terminal group 111 to the first contact terminal group 112 or the second contact terminal group 113 according to a control signal, so that the current selectively flows into the electricity meter 300 through the first current port 1 or the second current port 2 of the electricity meter 300, realizing the switching of the running direction of the electricity meter 300.

[0043] In the embodiments of the present application, the gating unit 1101 may adopt any existing controllable switch devices such as a double-pole double-throw switch, a relay, a solid-state switch, etc. The connection state can be switched by switching the on / off between the common terminal group 111 and the first contact terminal group 112 and the second contact terminal group 113. For example, when the common terminal group 111 is connected to the first contact terminal group 112, it corresponds to the first connection state, and when the common terminal group 111 is connected to the second contact terminal group 113, it corresponds to the second connection state, and thus the current flowing into the electricity meter 300 from the first current port 1 or the second current port 2 can be switched.

[0044] The control signal may be a signal sent by a controller such as a Microcontroller Unit (MCU), a System on Chip (SoC), or a single-chip microcomputer in response to an operation signal, and the operation signal may be a signal sent by a tester through triggering methods such as a key, Bluetooth, Wifi, etc., and can be specifically determined according to the actual application scenario, which is not limited here.

[0045] For example, the common terminal group 111 can be connected to the first contact terminal group 112 in response to a control signal. At this time, current flows into the watt-hour meter 300 from the first current port 1. After a period of time, the common terminal group 111 is then switched to be connected to the second contact terminal group 113. At this time, current flows into the watt-hour meter 300 from the second current port 2, realizing the switching of the running direction.

[0046] As Figure 3 shown, in some embodiments of the present application, the watt-hour meter 300 is a single-phase watt-hour meter. The common terminal group 111 may include a first common terminal b and a second common terminal e. The first contact terminal group 112 may include a first contact terminal c and a second contact terminal d. The second contact terminal group 113 may include a third contact terminal a and a fourth contact terminal f. The first contact terminal c and the fourth contact terminal f are respectively connected to the first current port 1 of the watt-hour meter 300. The second contact terminal d and the third contact terminal a are respectively connected to the second current port 2 of the watt-hour meter 300. When the first common terminal b is connected to the first contact terminal c and the second common terminal e is connected to the second contact terminal d, current flows into the watt-hour meter 300 through the first current port 1, causing the watt-hour meter 200 to run forward. When the first common terminal b is connected to the third contact terminal a and the second common terminal e is connected to the fourth contact terminal f, current flows into the watt-hour meter 300 through the second current port 2, causing the watt-hour meter 300 to run backward.

[0047] Referring to Figure 3 , in an application scenario with an actual load, the watt-hour meter 300 is a single-phase watt-hour meter. L is the live wire of the mains power led out from the power supply end 200, N is the neutral wire of the mains power led out from the power supply end 200. The first current port 1 is the live wire in-port of the watt-hour meter 300, and the second current port 2 is the live wire out-port of the watt-hour meter 300.

[0048] When the first common terminal b is connected to the first contact terminal c and the second common terminal e is connected to the second contact terminal d, current flows into the watt-hour meter 300 through the first current port 1. At this time, the watt-hour meter 200 can run forward. When the first common terminal b is switched to be connected to the third contact terminal a and the second common terminal e is switched to be connected to the fourth contact terminal f, current flows into the watt-hour meter 300 through the second current port 2. At this time, the watt-hour meter 300 can run backward.

[0049] As Figure 4As shown, for the application scenario of the simulated load, the simulated current can control the magnitude of the current in the loop. The outgoing line of the simulated current line can be connected to the first common terminal b, and the return line of the simulated current line is connected to the second common terminal e. Similar to the actual load, when the first common terminal b is connected to the first contact terminal c and the second common terminal e is connected to the second contact terminal d, the current flows into the electricity meter 300 through the first current port 1. At this time, the electricity meter 200 can run forward; when the first common terminal b is switched to be connected to the third contact terminal a and the second common terminal e is switched to be connected to the fourth contact terminal f, the current flows into the electricity meter 300 through the second current port 2 of the electricity meter 300. At this time, the electricity meter 300 can run backward.

[0050] It can be understood that if the electricity meter 300 is a three-phase meter, then Figure 3 or Figure 4 the wiring method shown can be used as a unit, and the three-phase lines of the A phase, B phase, and C phase of the three-phase meter can be arranged and wired in the same way respectively, which will not be elaborated here.

[0051] As Figure 5 shown, in some embodiments of the present application, the electricity meter 300 is a three-phase electricity meter, and the switching module 110 may further include a first switch unit 1102 and a second switch unit 1103; the first switch unit 1102 can be used to be powered on and work when the common terminal group 111 is connected to the first contact terminal group 112, so that the current flows into the electricity meter 300 through the first current port of the target phase of the electricity meter 300, realizing the forward running of the electricity meter 300; the second switch unit 1103 can be used to be powered on and work when the common terminal group 111 is connected to the second contact terminal group 113, so that the current flows into the electricity meter 300 through the second current port of the target phase of the electricity meter 300, realizing the reverse running of the electricity meter 300.

[0052] In the embodiments of the present application, when the electricity meter 300 is a three-phase electricity meter, the current direction can be switched by connecting different switch units to the ports of the electricity meter. The switch unit here can be a contactor, a relay, a semiconductor switch element such as an Insulated Gate Bipolar Transistor (IGBT), etc., and can be specifically determined according to the actual application scenario, which is not limited here.

[0053] Taking the A phase as an example, the first current port corresponds to the A-phase input port AI, and the second current port corresponds to the A-phase output port AO. When the common terminal group 111 is connected to the first contact terminal group 112, the first switch unit 1102 is powered on and operates, and the current flows into the watt-hour meter 300 through the A-phase input port AI, realizing forward counting; when the common terminal group 111 is connected to the second contact terminal group 113, the second switch unit 1103 is powered on and operates, and the current flows into the watt-hour meter 300 through the A-phase output port AO, realizing reverse counting.

[0054] In some embodiments of the present application, the power supply terminal of the first switch unit 1102 is connected to the first contact terminal group 112. The first output terminal of the first switch unit 1102 is connected to the first current port of the target phase of the watt-hour meter 300, such as the A-phase input port AI, and the second output terminal of the first switch unit 1102 is connected to the second current port of the target phase of the watt-hour meter 300, such as the A-phase output port AO.

[0055] The power supply terminal of the second switch unit 1103 is connected to the second contact terminal group 113. The first output terminal of the second switch unit 1103 is connected to the second current port of the target phase of the watt-hour meter 300, such as the A-phase output port AO, and the second output terminal of the second switch unit 1103 is connected to the first current port of the target phase of the watt-hour meter 300, such as the A-phase input port AI.

[0056] As Figure 6 shown, in an application scenario with an actual load, the first switch unit 1102 is a 2# contactor, and the second switch unit 1103 is a 1# contactor. Both of these contactors are normally open contactors. Specifically, the 2# contactor is a forward-counting contactor. The L1 terminal of the 2# contactor is connected to one of the phases to be tested of the watt-hour meter 300, that is, one of the A phase, B phase, and C phase. The L2 terminal is connected to one end of the load, and the other end of the load is connected to the neutral line N to form a loop to consume electric energy, causing the watt-hour meter 300 under test to count.

[0057] The 1# contactor is a reverse-counting contactor. Similarly, the L1 terminal of the 1# contactor is connected to the same phase as the L1 terminal of the 2# contactor, the L2 terminal is connected to the load, and the other end of the load is connected to the neutral line N to form a loop to consume electric energy, causing the watt-hour meter 300 under test to count.

[0058] Figure 6 In <>, A1 and A2 are the power supply terminals of the contactor. The 1# contactor or 2# contactor is controlled to operate through the selection unit 1101, such as a double-pole double-throw switch. Among them, the first common terminal b is connected to the live wire L of the mains, and the second common terminal e is connected to the neutral line N of the mains.

[0059] When the first common terminal b is connected to the A2 port of the 2# contactor through the first contact terminal c, and the second common terminal e is connected to the A1 port of the 2# contactor through the second contact terminal d, the 2# contactor is energized and attracted to conduct the circuit, and the load works to generate power consumption. At this time, current flows into the A-phase input port AI of the watt-hour meter 300, and the watt-hour meter 300 runs forward.

[0060] When the first common terminal b is connected to the A1 port of the 1# contactor through the third contact terminal a, and the second common terminal e is connected to the A2 port of the 1# contactor through the fourth contact terminal f, the 1# contactor is energized and attracted to conduct the circuit, and the load works to generate power consumption. At this time, current flows into the A-phase output port AO of the watt-hour meter 300, and the watt-hour meter 300 runs backward.

[0061] As Figure 7 shown, in the application scenario of the simulated load, the L1 terminal of the 1# contactor is connected to the A-phase simulated current outgoing line, and the L2 terminal is connected to the A-phase simulated current return line. The L1 terminal of the 2# contactor is connected to the A-phase simulated current outgoing line, and the L2 terminal is connected to the A-phase simulated current return line. Similarly, when the first common terminal b is connected to the A2 port of the 2# contactor through the first contact terminal c, and the second common terminal e is connected to the A1 port of the 2# contactor through the second contact terminal d, the 2# contactor is energized and attracted to conduct the circuit, and the load works to generate power consumption. At this time, current flows from A into the L1 terminal of the 2# contactor, passes through the T1 terminal of the 2# contactor and the A-phase input port AI and flows into the watt-hour meter 300, then flows out from the A-phase output port AO, passes through the T2 terminal of the 2# contactor and flows back to the power grid from the L2 terminal, and the watt-hour meter 300 runs forward.

[0062] When the first common terminal b is connected to the A1 port of the 1# contactor through the third contact terminal a, and the second common terminal e is connected to the A2 port of the 1# contactor through the fourth contact terminal f, the 1# contactor is energized and attracted to conduct the circuit, and the load works to generate power consumption. At this time, current flows from A into the L1 terminal of the 1# contactor, passes through the T1 terminal of the 1# contactor and the A-phase output port AO and flows into the watt-hour meter 300, then flows out from the A-phase input port AI, passes through the T2 terminal of the 1# contactor and flows back to the power grid from the L2 terminal, and the watt-hour meter 300 runs backward.

[0063] It can be understood that if it is necessary to detect the B phase or C phase, the Figure 6 or Figure 7 shown wiring method can be used as a unit, and the B phase or C phase can be arranged and wired in three ways in the same way, which will not be elaborated here.

[0064] As Figure 8As shown, in some embodiments of the present application, the electricity meter 300 is a three-phase electricity meter, and the switching module 110 may further include a first switch group 1104 and a second switch group 1105; the first switch group 1104 can be used to be powered on and work when the common terminal group 111 is connected to the first contact terminal group 112, so that current flows into the electricity meter through the first current port of each phase of the electricity meter 300, realizing the forward running of the electricity meter 300; the second switch group 1105 can be used to be powered on and work when the common terminal group 111 is connected to the second contact terminal group 113, so that current flows into the electricity meter through the second current port of each phase of the electricity meter 300, realizing the reverse running of the electricity meter 300.

[0065] In the embodiments of the present application, if the three phases of the three-phase electricity meter are tested simultaneously, 2 contactors can be used to form a switch group to realize the reverse of the current.

[0066] Specifically, referring to Figure 9 , where the first switch group 1104 includes a 1# contactor and a 2# contactor, and the second switch group 1105 includes a 3# contactor and a 4# contactor. When connecting the actual load, the L1 terminal, L2 terminal, and L3 terminal of the 1# contactor are respectively connected to the A phase, B phase, and C phase of the three-phase electricity, and the L1 terminal, L2 terminal, and L3 terminal of the 2# contactor are connected to the load. The L1 terminal, L2 terminal, and L3 terminal of the 3# contactor are respectively connected to the A phase, B phase, and C phase of the three-phase electricity, and the L1 terminal, L2 terminal, and L3 terminal of the 4# contactor are connected to the load.

[0067] When the first common terminal b is connected to the A2 port of the 1# contactor and the 2# contactor through the first contact terminal c, and the second common terminal e is connected to the A1 port of the 1# contactor and the 2# contactor through the second contact terminal d, the 1# contactor and the 2# contactor are powered on and attracted to make the circuit conduct, and the load works to consume electric energy. At this time, current flows into the A-phase input port AI, B-phase input port BI, and C-phase input port CI of the electricity meter 300, and current flows out of the A-phase output port AO, B-phase output port BO, and C-phase output port CO of the electricity meter 300, and the electricity meter 300 runs forward.

[0068] When the first common terminal b is connected to the A1 port of the 3# contactor and the 4# contactor through the third contact terminal a, and the second common terminal e is connected to the A2 port of the 3# contactor and the 4# contactor through the fourth contact terminal f, the 3# contactor and the 4# contactor are powered on and attracted to make the circuit conduct, and the load works to consume electric energy. At this time, current flows into the A-phase output port AO, B-phase output port BO, and C-phase output port CO of the electricity meter 300, and current flows out of the A-phase input port AI, B-phase input port BI, and C-phase input port CI of the electricity meter 300, and the electricity meter 300 runs in reverse.

[0069] As Figure 10As shown, in the application scenario of the simulated load, the L1 terminal, L2 terminal, and L3 terminal of the 1# contactor are respectively connected to the outgoing lines of the A phase, B phase, and C phase of the simulated current, and the L1 terminal, L2 terminal, and L3 terminal of the 2# contactor are connected to the return lines of the A phase, B phase, and C phase of the simulated current. The L1 terminal, L2 terminal, and L3 terminal of the 3# contactor are respectively connected to the outgoing lines of the A phase, B phase, and C phase of the simulated current, and the L1 terminal, L2 terminal, and L3 terminal of the 4# contactor are connected to the return lines of the A phase, B phase, and C phase of the simulated current.

[0070] Similarly, when the first common terminal b is connected to the A2 port of the 1# contactor and the 2# contactor through the first contact terminal c, and the second common terminal e is connected to the A1 port of the 1# contactor and the 2# contactor through the second contact terminal d, the 1# contactor and the 2# contactor are energized and attracted to make the circuit conduct, and the load works to generate power consumption. At this time, current flows into the A-phase input port AI, B-phase input port BI, and C-phase input port CI of the watt-hour meter 300, and current flows out of the A-phase output port AO, B-phase output port BO, and C-phase output port CO of the watt-hour meter 300, and the watt-hour meter 300 runs forward.

[0071] When the first common terminal b is connected to the A1 port of the 3# contactor and the 4# contactor through the third contact terminal a, and the second common terminal e is connected to the A2 port of the 3# contactor and the 4# contactor through the fourth contact terminal f, the 3# contactor and the 4# contactor are energized and attracted to make the circuit conduct, and the load works to generate power consumption. At this time, current flows into the A-phase output port AO, B-phase output port BO, and C-phase output port CO of the watt-hour meter 300, and current flows out of the A-phase input port AI, B-phase input port BI, and C-phase input port CI of the watt-hour meter 300, and the watt-hour meter 300 runs backward.

[0072] Based on the above embodiments, the embodiment of the present application further provides a method for testing a watt-hour meter, as Figure 11 shown, the method for testing the watt-hour meter may include the following steps.

[0073] Step S1, control the switching module of the watt-hour meter running direction switching device corresponding to any embodiment to be in the first connection state, and record the flashing times of the active pulse indicator of the watt-hour meter and the first pulse number. Figures 1 to 10 Assume that the first connection state corresponds to running forward. In the case where the power of the watt-hour meter is cleared, control the switching module to be in the first connection state through a control signal, and the watt-hour meter starts to work and runs forward. Synchronously count the flashing times of the active pulse indicator of the watt-hour meter and the pulse number.

[0074]

[0075] ​Step S2: When the first cumulative number of flashes reaches the preset number, record the current number of first pulses, and switch the switching module to the second connection state. Then, re-record the number of flashes of the active pulse indicator of the electricity meter and the number of second pulses.

[0076] When the number of flashes recorded in Step S1, i.e., the first cumulative number of flashes, reaches the preset number, record the currently counted number of pulses, i.e., the current number of first pulses, and control the switching module to switch from the first connection state to the second connection state to make the electricity meter run backwards.

[0077] In the embodiment of the present application, the preset number can be any value such as 8, 10, 20, etc., and can be specifically determined according to the actual application scenario, which is not limited here.

[0078] Step S3: When the second cumulative number of flashes reaches the preset number, record the current number of second pulses.

[0079] When the electricity meter runs backwards, the number of flashes of the active pulse indicator of the electricity meter and the number of pulses are also synchronously counted. When the second cumulative number of flashes also reaches the preset number, record the current number of second pulses.

[0080] Step S4: Determine the reliability of the electricity meter according to the current number of first pulses and the current number of second pulses.

[0081] In the embodiment of the present application, when the electricity meter runs forward and backward, the number of flashes of the active pulse indicator is respectively counted. When the number of flashes corresponding to running forward and backward is the same, the reliability of the electricity meter is determined according to the counted number of pulses, which can improve the reliability of the test. And the switching of the running direction is realized through the switching module, greatly improving the switching speed and the test efficiency.

[0082] In some embodiments of the present application, determining the reliability of the electricity meter according to the current number of first pulses and the current number of second pulses may further include: controlling the electricity meter running direction switching device to be electrically disconnected from the electricity meter. After the electricity meter is powered on again, obtain the forward active total electric energy and the reverse active total electric energy of the electricity meter; determine the reliability of the electricity meter according to the current number of first pulses and the forward active total electric energy, and the current number of second pulses and the reverse active total electric energy.

[0083] After the foregoing statistics are completed, control the electricity meter running direction switching device to be electrically disconnected from the electricity meter, and disconnect the load. Then, power on the electricity meter again. After the electricity meter is powered on, read the forward active total electric energy and the reverse active total electric energy of the electricity meter, and compare and check the read forward active total electric energy and reverse active total electric energy with the electric energy converted from the current number of first pulses and the current number of second pulses respectively, so as to determine the reliability of the electricity meter.

[0084] Specifically, the forward electric energy when the electricity meter runs forward can be calculated based on the active pulse constant of the electricity meter and the current number of the first pulses, and the reverse electric energy when the electricity meter runs backward can be calculated based on the active pulse constant and the current number of the second pulses; if the calculated forward electric energy is the same as the read total forward active electric energy, and the reverse electric energy is the same as the reverse active total electric energy, the test passes and the electricity meter is determined to be reliable; otherwise, if one or both of them are different, it can be determined that there is an abnormality in the electricity meter.

[0085] The switching device in the embodiment of the present application can be applied to the scenarios of simulated running and actual running of the electricity meter. The switching speed of forward and reverse running is fast, and it can more realistically simulate the situation of forward and reverse running in the actual power consumption process, improving the gap in the reliability test method for electricity metering products.

[0086] The above are only the preferred embodiments of the present application and do not impose any formal limitations on the present application. Although the present application has been disclosed above with the preferred embodiments, it is not intended to limit the present application. Any person skilled in the art can make some changes or modifications to equivalent embodiments by using the disclosed technical content without departing from the technical solution scope of the present application. However, any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application still fall within the scope of the technical solution of the present application.

Claims

1. A device for switching the running direction of an electric energy meter, characterized in that It includes a switching module respectively connected to a power supply terminal and a watt-hour meter. The switching module is configured to switch between a first connection state and a second connection state to change the direction of the current flowing to the watt-hour meter, thereby switching the running direction of the watt-hour meter.

2. The electric energy meter running direction switching device according to claim 1, wherein The switching module includes a gating unit, and the gating unit includes a common terminal group, a first contact terminal group, and a second contact terminal group. The gating unit is used to selectively connect the common terminal group to the first contact terminal group or the second contact terminal group according to a control signal, so that the current selectively flows into the watt-hour meter through a first current port or a second current port of the watt-hour meter, realizing the switching of the running direction of the watt-hour meter.

3. The electric energy meter running direction switching device according to claim 2, characterized in that The watt-hour meter is a single-phase watt-hour meter. The common terminal group includes a first common terminal and a second common terminal. The first contact terminal group includes a first contact terminal and a second contact terminal. The second contact terminal group includes a third contact terminal and a fourth contact terminal. The first contact terminal and the fourth contact terminal are respectively connected to a first current port of the watt-hour meter, and the second contact terminal and the third contact terminal are respectively connected to a second current port of the watt-hour meter. When the first common terminal is connected to the first contact terminal and the second common terminal is connected to the second contact terminal, the current flows into the watt-hour meter through the first current port of the watt-hour meter, causing the watt-hour meter to run forward. When the first common terminal is connected to the third contact terminal and the second common terminal is connected to the fourth contact terminal, the current flows into the watt-hour meter through the second current port of the watt-hour meter, causing the watt-hour meter to run backward.

4. The electric energy meter running direction switching device according to claim 2, characterized in that The watt-hour meter is a three-phase watt-hour meter. The switching module further includes a first switch unit and a second switch unit. The first switch unit is used to be powered on and work when the common terminal group is connected to the first contact terminal group, so that the current flows into the watt-hour meter through a first current port of the target phase of the watt-hour meter, realizing the forward running of the watt-hour meter. The second switch unit is used to be powered on and work when the common terminal group is connected to the second contact terminal group, so that the current flows into the watt-hour meter through a second current port of the target phase of the watt-hour meter, realizing the backward running of the watt-hour meter.

5. The electric energy meter running direction switching device according to claim 4, wherein The power supply terminal of the first switch unit is connected to the first contact terminal group. The first output terminal of the first switch unit is connected to the first current port of the target phase of the watt-hour meter. The second output terminal of the first switch unit is connected to the second current port of the target phase of the watt-hour meter. The power supply terminal of the second switch unit is connected to the second contact terminal group. The first output terminal of the second switch unit is connected to the second current port of the target phase of the watt-hour meter. The second output terminal of the second switch unit is connected to the first current port of the target phase of the watt-hour meter.

6. The electric energy meter running direction switching device according to claim 2, characterized in that The watt-hour meter is a three-phase watt-hour meter. The switching module further includes a first switch group and a second switch group. The first switch group is used to be powered on and work when the common terminal group is connected to the first contact terminal group, so that the current flows into the watt-hour meter through the first current port of each phase of the watt-hour meter, realizing the forward running of the watt-hour meter. The second switch group is used to be powered on and work when the common terminal group is connected to the second contact terminal group, so that the current flows into the watt-hour meter through the second current port of each phase of the watt-hour meter, realizing the reverse running of the watt-hour meter.

7. The electric energy meter running direction switching device according to claim 6, characterized in that, The first switch group includes a first switch component and a second switch component. The power supply terminals of the first switch component and the second switch component are respectively connected to the first contact terminal group. The three output terminals of the first switch component are respectively and correspondingly connected to the first current ports of the A phase, B phase, and C phase of the watt-hour meter. The three output terminals of the second switch component are respectively and correspondingly connected to the second current ports of the A phase, B phase, and C phase of the watt-hour meter. The second switch group includes a third switch component and a fourth switch component. The power supply terminals of the third switch component and the fourth switch component are respectively connected to the second contact terminal group. The three output terminals of the third switch component are respectively and correspondingly connected to the second current ports of the A phase, B phase, and C phase of the watt-hour meter. The three output terminals of the fourth switch component are respectively and correspondingly connected to the first current ports of the A phase, B phase, and C phase of the watt-hour meter.

8. A method for testing an electric energy meter, characterized in that, The method includes: Controlling the switching module of the watt-hour meter running direction switching device as claimed in any one of claims 1-7 to be in the first connection state, and recording the flashing times of the active pulse indicator of the watt-hour meter and the first pulse number. When the first cumulative flashing times reach the preset times, recording the current first pulse number, and switching the switching module to the second connection state, and re-recording the flashing times of the active pulse indicator of the watt-hour meter and the second pulse number. When the second cumulative flashing times reach the preset times, recording the current second pulse number. Determining the reliability of the watt-hour meter according to the current first pulse number and the current second pulse number.

9. The electric energy meter testing method according to claim 8, wherein, The determining the reliability of the watt-hour meter according to the current first pulse number and the current second pulse number includes: Controlling the watt-hour meter running direction switching device to be electrically disconnected from the watt-hour meter. After the watt-hour meter is powered on again, obtaining the forward active total electric energy and the reverse active total electric energy of the watt-hour meter. Determining the reliability of the watt-hour meter according to the current first pulse number and the forward active total electric energy, and the current second pulse number and the reverse active total electric energy.

10. The electric energy meter testing method according to claim 9, characterized in that, The determining the reliability of the watt-hour meter according to the current first pulse number and the forward active total electric energy, and the current second pulse number and the reverse active total electric energy includes: Obtaining the forward electric energy when the watt-hour meter runs forward according to the active pulse constant of the watt-hour meter and the current first pulse number, and obtaining the reverse electric energy when the watt-hour meter runs backward according to the active pulse constant and the current second pulse number. If the forward electric energy is the same as the total forward active electric energy, and the reverse electric energy is the same as the total reverse active electric energy, the test passes and it is determined that the electric energy meter is reliable.

Images