Electric energy meter power supply testing device, system and method

Abstract

The invention relates to the technical field of electric energy meter detection, in particular to an electric energy meter power supply test device, system and method, the device comprises an AC power supply module, a relay group module and a control module, the AC power supply module is responsible for providing test voltages of different specifications, and the relay group module adopts a design that four groups of relays are connected in series; the logic on-off state of each relay is accurately regulated and controlled through the control module, flexible switching of multiple voltage levels is achieved, and therefore test voltages of different specifications can be output to the electric energy meter. The device supports a self-defined power-on / power-off cycle test process, and the power supply test efficiency of the electric energy meter is remarkably improved; meanwhile, the device can truly restore the voltage fluctuation scene faced by the electric energy meter in the operation of the power grid by simulating the rapid jump of the voltage level, thereby further guaranteeing the reliability of the test result.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric energy meter detection, in particular to an electric energy meter power supply testing device, system and method. BACKGROUND

[0002] As a product of electric energy measurement, the operation reliability of an electric energy meter is very important. The uninterrupted power-on and power-off test verifies whether the product will have hardware or software abnormalities in the process of rapid power-on and power-off, which is an important supplement to the product reliability evaluation. In this test, a power supply device and system capable of rapidly powering on and powering off the electric energy meter are required. At present, the power supply device and system used in the traditional uninterrupted power-on and power-off test mainly rely on manual setting of fixed schemes to provide the rated power supply voltage and power-on and power-off time of the electric energy meter, and cannot automatically realize free switching of multiple power supply schemes.

[0003] The existing patent with publication number CN103454612B provides an electric meter power-on testing device. A power supply plug is electrically connected with a master switch, the master switch is electrically connected with two transformers, the two transformers are commonly electrically connected to one end of a changeover switch, the other end of the changeover switch is electrically connected with two AC switches, a branch electrically connected with the changeover switch and a second AC switch is electrically connected with an attenuator, the attenuator is electrically connected with a copy controller; two meter holders with indicator lights are electrically connected with the two AC switches, two hand levers are installed on the testing device surface above the two meter holders; one end of two communication modules is electrically connected with the two meter holders, and the other end is electrically connected with an electronic computer to realize analysis, processing and output of testing data and information.

[0004] The electric meter power-on testing device realizes power-on testing of the electric energy meter under two different voltage values by using the changeover switch, but manual intervention is still required to open and close the changeover switch when the test voltage is changed, resulting in low testing efficiency. SUMMARY

[0005] Therefore, it is necessary to provide an electric energy meter power supply testing device, system and method to solve the problem of low testing efficiency of the current electric energy meter power supply testing.

[0006] In a first aspect, the present application provides an electric energy meter power supply testing device, which comprises an AC power supply module, a relay group module and a control module; the AC power supply module is used to provide a first voltage level power supply, a second voltage level power supply, a third voltage level power supply and a fourth voltage level power supply to the relay group module;

[0007] The relay group module includes a first relay, a second relay, a third relay, and a fourth relay. The first input terminal of the first relay is connected to the first voltage level power output terminal of the AC power module, and the second input terminal is connected to the second voltage level power output terminal of the AC power module. The output terminal of the first relay is connected to the first input terminal of the second relay, the second input terminal of the second relay is connected to the third voltage level power output terminal of the AC power module, the output terminal of the second relay is connected to the first input terminal of the third relay, the second input terminal of the third relay is connected to the fourth voltage level power output terminal of the AC power module, the output terminal of the third relay is connected to the input terminal of the fourth relay, and the output terminal of the fourth relay is connected to the energy meter.

[0008] The control module is connected to the control terminals of each relay in the relay group module, and controls the relay group module to output the target test voltage to the energy meter according to the test command.

[0009] Furthermore, the AC power module includes a linear transformer and a main control switch. The first end of the main control switch is connected to the AC power input interface, and the second end is connected to the input end of the linear transformer. The first voltage level power output end of the linear transformer is connected to the first input end of the first relay, the second voltage level power output end is connected to the second input end of the first relay, the third voltage level power output end is connected to the second input end of the second relay, and the fourth voltage level power output end is connected to the second input end of the third relay.

[0010] Furthermore, a relay drive unit is provided between the signal input / output terminal of the control module and the control coil of each relay in the relay group module.

[0011] Furthermore, each relay in the relay group module is a single-pole double-throw magnetic latching relay or an electromagnetic relay.

[0012] Furthermore, the first voltage level power supply is a 380V power supply, the second voltage level power supply is a 220V power supply, the third voltage level power supply is a 100V power supply, and the fourth voltage level power supply is a 57.7V power supply.

[0013] Secondly, this application also provides a power supply testing system for electricity meters, including a power supply testing device for electricity meters as described in the first aspect and a host computer, wherein the host computer is connected to a control module in the power supply testing device for electricity meters; the host computer sends test commands to the control module, and the control module controls the relay group module to output test voltage to the electricity meter according to the test commands.

[0014] Furthermore, the host computer and the control module communicate via RS485 / RS232 serial ports.

[0015] Thirdly, this application also provides a method for testing the power supply of an electricity meter, characterized in that the control module applied to the electricity meter power supply testing device as described in the first aspect includes:

[0016] Step S1: Obtain the target test voltage according to the test command;

[0017] Step S2: When the target test voltage is at the first voltage level, turn off the first relay and turn on the second and third relays; when the target test voltage is at the second voltage level, turn off the first and third relays and turn on the second relay; when the target test voltage is at the third voltage level, turn on the first relay and turn off the second and third relays; when the target test voltage is at the fourth voltage level, turn off the first relay, the second relay, and the third relay.

[0018] Step S3: Turn on the main control switch and check if the total output voltage is the target test voltage; if yes, turn on the fourth relay; if no, proceed to step S4.

[0019] Step S4: Turn off the main control switch;

[0020] Step S5: Turn off the fourth relay.

[0021] Furthermore, the method also includes:

[0022] Step S60: Obtain the load current of the power supply circuit;

[0023] Step S61: When the load current exceeds the preset threshold, step S5 is executed.

[0024] Furthermore, the test instructions also include the voltage power-on duration, voltage switching time, and power-off duration.

[0025] The aforementioned electricity meter power supply testing device, system, and method utilize an AC power module to provide test voltages of different specifications. The relay module employs a four-relay series design, and through precise control of the on / off states of each relay's logic by the control module, flexible switching between multiple voltage levels is achieved, enabling the output of test voltages of different specifications to the electricity meter. This device supports customizable power-on / power-off cyclic testing procedures, significantly improving the efficiency of electricity meter power supply testing. Furthermore, by simulating rapid voltage level changes, the device can realistically reproduce the voltage fluctuation scenarios faced by the electricity meter during grid operation, further ensuring the reliability of the test results. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the power supply test device for an energy meter in one embodiment;

[0027] Figure 2 This is a schematic diagram of the power supply test device for an energy meter in another embodiment;

[0028] Figure 3 This is a flowchart illustrating a power supply test method for an electricity meter in one embodiment;

[0029] Figure 4 This is a schematic diagram of the power supply test system for an electricity meter in one embodiment. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0031] Example 1

[0032] like Figure 1 As shown, this embodiment provides a power supply testing device for an electricity meter, including an AC power module, a relay group module, and a control module. The AC power module is used to provide power at a first voltage level, a second voltage level, a third voltage level, and a fourth voltage level to the relay group module.

[0033] Specifically, such as Figure 2 As shown, the AC power module includes a linear transformer and a main control switch. The first end of the main control switch is connected to the AC power input interface, and the second end is connected to the input end of the linear transformer. The first voltage level power output end of the linear transformer is connected to the first input end of the first relay, the second voltage level power output end is connected to the second input end of the first relay, the third voltage level power output end is connected to the second input end of the second relay, and the fourth voltage level power output end is connected to the second input end of the third relay.

[0034] The linear transformer primarily achieves isolation and voltage transformation. Its windings are divided into primary and secondary windings. The primary winding serves as the input winding for mains power, while the secondary winding outputs a first voltage level (UL1), a second voltage level (UL2), a third voltage level (UL3), and a fourth voltage level (UL4) power supply via taps or a multi-winding configuration (multi-winding configuration sharing a neutral wire N). In a preferred embodiment, the first voltage level power supply is 380V, the second voltage level power supply is 220V, the third voltage level power supply is 100V, and the fourth voltage level power supply is 57.7V. The main control switch is used for redundant control. After the relay module completes the contact configuration for the target test voltage, the main control switch is closed to connect to the mains power, preventing overvoltage or overcurrent faults.

[0035] The relay module includes a first relay, a second relay, a third relay, and a fourth relay. These relays are connected in series in the circuit, ensuring that the electricity meter is connected to only a single power source at any given time, thus guaranteeing the reliability of the system's power supply.

[0036] Specifically, the first input terminal of the first relay is connected to the first voltage level power output terminal of the AC power module, the second input terminal is connected to the second voltage level power output terminal of the AC power module, the output terminal of the first relay is connected to the first input terminal of the second relay, the second input terminal of the second relay is connected to the third voltage level power output terminal of the AC power module, the output terminal of the second relay is connected to the first input terminal of the third relay, the second input terminal of the third relay is connected to the fourth voltage level power output terminal of the AC power module, the output terminal of the third relay is connected to the input terminal of the fourth relay, and the output terminal of the fourth relay is connected to the electricity meter.

[0037] Preferably, each relay in the relay group module is a single-pole double-throw magnetic latching relay or an electromagnetic relay. A single-pole double-throw magnetic latching relay or electromagnetic relay typically includes three contacts: a common terminal (COM), a normally open terminal (NO), and a normally closed terminal (NC). When the relay is not energized, the common terminal (COM) is open with the normally open contact (NO) and closed with the normally closed contact (NC). When the relay is energized, the common terminal (COM) switches from the normally closed contact (NC) to the normally open contact (NO), thus switching the circuit. Specifically, the NO terminal of the first relay is connected to the first voltage level power output terminal (UL1) of the AC power module, the NC terminal is connected to the second voltage level power output terminal (UL2) of the AC power module, the COM terminal of the first relay is connected to the NO terminal of the second relay, the NC terminal of the second relay is connected to the third voltage level power output terminal (UL3) of the AC power module, the COM terminal of the second relay is connected to the NO terminal of the third relay, the NC terminal of the third relay is connected to the fourth voltage level power output terminal (UL4) of the AC power module, the COM terminal of the third relay is connected to the NO terminal of the fourth relay, and the COM terminal of the fourth relay is connected to the energy meter.

[0038] The control module connects to the control terminals of each relay in the relay group module and controls the relay group module to output the target test voltage to the energy meter according to the test command. Preferably, the control module includes a management MCU, which is used to acquire the test command sent by the user and accurately switch the contact state of each relay in the relay group module according to the test command, so that the relay group module outputs the target test voltage to the energy meter.

[0039] Furthermore, such as Figure 3 As shown, this embodiment also provides a power supply testing method for an electricity meter, which is applied to the control module of the above-mentioned power supply testing device for an electricity meter. Specifically, it includes the following steps:

[0040] Step S1: Obtain the target test voltage according to the test command.

[0041] Step S2: When the target test voltage is at the first voltage level, turn off the first relay and turn on the second and third relays; when the target test voltage is at the second voltage level, turn off the first and third relays and turn on the second relay; when the target test voltage is at the third voltage level, turn on the first relay and turn off the second and third relays; when the target test voltage is at the fourth voltage level, turn off the first, second, and third relays.

[0042] Specifically, opening the relay refers to the control module applying a drive signal (energizing / pulse) to the relay coil. At this time, the contact state of the relay changes so that the COM terminal and the NO terminal are connected, and the NC terminal is disconnected. Closing the relay refers to the control module removing the drive signal (energizing / reverse pulse) from the relay coil. At this time, the contact state of the relay changes so that the COM terminal and the NC terminal are connected, and the NO terminal is disconnected.

[0043] Step S3: Turn on the main control switch and check if the total output voltage is the target test voltage; if yes, turn on the fourth relay; if no, proceed to step S4.

[0044] Specifically, after the main control switch is turned on and connected to the mains power, the control module obtains the output voltage of the third relay in the relay group module through a resistor voltage divider and determines whether this output voltage is the target test voltage. Preferably, when the control module includes a management MCU, the management MCU obtains the output voltage of the third relay through its AD analog-to-digital converter (ADC) pin. The management MCU then determines whether this output voltage is the same as the target test voltage in the test command based on the magnitude of the voltage detected by the AD pin. If so, it indicates that the logic state of each relay in the relay group module is correct, and the fourth relay can be turned on to output voltage to the energy meter for testing.

[0045] Step S4: Turn off the main control switch.

[0046] The main control switch can be turned on or off manually or automatically by the control module.

[0047] Step S5: Turn off the fourth relay.

[0048] In addition, when the test command sets the target test voltage to 0V, it indicates that the test is over. At this time, first turn off the main control switch, and then turn off the fourth relay.

[0049] Furthermore, the power supply test method for electricity meters also includes:

[0050] Step S60: Obtain the load current of the power supply circuit.

[0051] Specifically, the load current of the power supply circuit is sampled by setting a current sensor (including a current transformer or manganese copper, etc.) in the power supply circuit.

[0052] Step S61: When the load current exceeds the preset threshold, proceed to step S5.

[0053] When the control module includes a management MCU, another analog-to-digital converter (ADC) pin of the management MCU acquires the load current sampled by the current sensor. The management MCU determines whether the load current exceeds a preset threshold based on the magnitude of the detected current from this ADC pin. When the load current exceeds the preset threshold, the management MCU shuts down the output of the fourth relay to perform overload protection. The preset threshold can be flexibly set by those skilled in the art based on the system's load capacity.

[0054] Furthermore, the test instructions may also include the voltage power-on duration, voltage switching time, and power-off duration, to enable uninterrupted power-on and power-off reliability testing of single-phase and three-phase energy meters.

[0055] Furthermore, considering the potential issue of insufficient driving capability at the signal input / output (I / O) terminals of the control module, a relay drive unit can be provided between the signal input / output terminals of the control module and the control coils of each relay in the relay group module. Preferably, the relay drive unit is a driver chip, such as the ULN2803A driver chip.

[0056] The electricity meter power supply testing device in this embodiment includes an AC power module, a relay group module, and a control module. The AC power module is responsible for providing test voltages of different specifications. The relay group module adopts a four-relay series design. Through the precise control of the on / off state of each relay logic by the control module, flexible switching of multiple voltage levels can be achieved, thereby enabling the output of test voltages of different specifications to the electricity meter. It also supports a custom power-on / power-off cycle test process. This device significantly improves the efficiency of electricity meter power supply testing. At the same time, by simulating rapid voltage level jumps, this device can realistically reproduce the voltage fluctuation scenario faced by the electricity meter in grid operation, further ensuring the reliability of the test results.

[0057] Example 2

[0058] like Figure 4 As shown, this embodiment provides a power meter power supply testing system, including a power meter power supply testing device and a host computer. The host computer is connected to the control module in the power meter power supply testing device. The host computer sends test commands to the control module, and the control module controls the relay group module to output test voltage to the power meter according to the test commands. The host computer and the control module can communicate via wired or wireless communication. Preferably, the host computer and the control module communicate via RS485 / RS232 serial port. The user can set the power meter test voltage specifications, voltage power-on duration, voltage switching time, power-off duration, etc., through the host computer software. The host computer generates corresponding test commands according to the user's settings and sends the test commands to the control module in the power meter power supply testing device. The specific control flow of the control module can be referred to the description of the power meter power supply testing device in Embodiment 1, and will not be repeated here.

[0059] The electricity meter power supply testing system in this embodiment, by setting up a host computer to connect to the electricity meter power supply testing device, facilitates users to formulate personalized testing plans and further improves the efficiency of electricity meter power supply testing.

[0060] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0061] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A power supply testing device for an electricity meter, characterized in that, The device includes an AC power module, a relay group module, and a control module; the AC power module is used to provide a first voltage level power supply, a second voltage level power supply, a third voltage level power supply, and a fourth voltage level power supply to the relay group module. The relay group module includes a first relay, a second relay, a third relay, and a fourth relay. The first input terminal of the first relay is connected to the first voltage level power output terminal of the AC power module, and the second input terminal is connected to the second voltage level power output terminal of the AC power module. The output terminal of the first relay is connected to the first input terminal of the second relay, the second input terminal of the second relay is connected to the third voltage level power output terminal of the AC power module, the output terminal of the second relay is connected to the first input terminal of the third relay, the second input terminal of the third relay is connected to the fourth voltage level power output terminal of the AC power module, the output terminal of the third relay is connected to the input terminal of the fourth relay, and the output terminal of the fourth relay is connected to the energy meter. The control module is connected to the control terminals of each relay in the relay group module, and controls the relay group module to output the target test voltage to the energy meter according to the test command.

2. The power supply testing device for an electricity meter according to claim 1, characterized in that, The AC power module includes a linear transformer and a main control switch. The first end of the main control switch is connected to the AC power input interface, and the second end is connected to the input end of the linear transformer. The first voltage level power output end of the linear transformer is connected to the first input end of the first relay, the second voltage level power output end is connected to the second input end of the first relay, the third voltage level power output end is connected to the second input end of the second relay, and the fourth voltage level power output end is connected to the second input end of the third relay.

3. The power supply testing device for an electricity meter according to claim 2, characterized in that, A relay drive unit is provided between the signal input / output terminal of the control module and the control coil of each relay in the relay group module.

4. The power supply testing device for an electricity meter according to claim 1, characterized in that, Each relay in the relay group module is a single-pole double-throw magnetic latching relay or an electromagnetic relay.

5. The power supply testing device for an electricity meter according to claim 1, characterized in that, The first voltage level power supply is 380V, the second voltage level power supply is 220V, the third voltage level power supply is 100V, and the fourth voltage level power supply is 57.7V.

6. A power supply testing system for an electricity meter, characterized in that, The device includes a power supply test device for an energy meter as described in any one of claims 1-5 and a host computer, wherein the host computer is connected to the control module in the power supply test device for an energy meter; the host computer sends test commands to the control module, and the control module controls the relay group module to output test voltage to the energy meter according to the test commands.

7. The power supply testing system for an electricity meter according to claim 6, characterized in that, The host computer and the control module communicate via RS485 / RS232 serial ports.

8. A method for testing the power supply of an electricity meter, characterized in that, The control module applied to the power supply test device for the electricity meter as described in any one of claims 1-5 includes: Step S1: Obtain the target test voltage according to the test command; Step S2: When the target test voltage is at the first voltage level, turn off the first relay and turn on the second and third relays; when the target test voltage is at the second voltage level, turn off the first and third relays and turn on the second relay; when the target test voltage is at the third voltage level, turn on the first relay and turn off the second and third relays; when the target test voltage is at the fourth voltage level, turn off the first relay, the second relay, and the third relay. Step S3: Turn on the main control switch and check if the total output voltage is the target test voltage; if yes, turn on the fourth relay; if no, proceed to step S4. Step S4: Turn off the main control switch; Step S5: Turn off the fourth relay.

9. The test method for the power supply test device of the electricity meter according to claim 8, characterized in that, The method further includes: Step S60: Obtain the load current of the power supply circuit; Step S61: When the load current exceeds the preset threshold, step S5 is executed.

10. The test method of the power supply test device for an electricity meter according to claim 8, characterized in that, The test instructions also include the power-on duration, voltage switching time, and power-off duration.

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