Electric energy meter power failure storage test tool

Abstract

The utility model relates to the technical field of electric energy meter testing, and particularly discloses an electric energy meter power failure storage testing tool which comprises an MCU master controller, a 485 communication module, an indicating lamp, a first relay, a second relay, a third relay, a standard meter and a meter to be tested, the MCU master controller conducts data interaction with an upper computer through the 485 communication module, the indicating lamp is connected with the MCU master controller, and the standard meter is connected with the 485 communication module. The relay I, the relay II and the relay III are respectively connected with the MCU main controller, the standard meter is connected with the relay I, the meter to be tested is respectively connected with the relay II and the relay III, and the relays control the on-off of voltage and current of the standard meter and the meter to be tested. According to the utility model, the power-down storage accuracy of the to-be-tested meter is tested by automatically controlling the on-off of the voltage and the current of the to-be-tested meter, and the power-down storage of the electric energy meter under different working conditions can be simulated, so that the test process of the power-down storage of the electric energy meter is better realized.

Description

Technical Field

[0001] The utility model relates to the technical field of electric energy meter function testing, in particular to a power-off storage testing tool for an electric energy meter. Background Art

[0002] In electricity meter data storage, power-off preservation and power-on recovery of critical data are crucial indicators of product reliability. The vast majority of data errors that occur during field operation, not due to component failures, are related to power-off data preservation and power-on recovery. This can be caused by a variety of factors, including untimely power-off detection and response, frequent power-off and power-on cycles leading to unstable power supply, battery passivation, and reduced energy storage performance of rectifier electrolytic capacitors.

[0003] To address data storage issues during power outages and power cycles, most electricity meter software uses power-off backup to improve reliability. This backup relies primarily on energy stored in electrolytic capacitors. If the backup data volume is large or power outages occur frequently, the capacitors will deplete the energy stored, leading to data corruption and affecting the meter's energy measurement and the calculation of user electricity bills. Utility Model Content

[0004] The purpose of the utility model is to solve the above problems and to design a power-off storage test tool for an electric energy meter.

[0005] To achieve the above-mentioned purpose, the technical solution of the present invention is a power-off storage test tool for an electric energy meter, including an MCU main control, communication, an indicator light, relay one, relay two, relay three, a standard meter and a meter to be tested. The MCU main control exchanges data with a host computer through a 485 communication module. The indicator light, the relay one, the relay two and the relay three are respectively connected to the MCU main control. The MCU main control controls the opening and closing states of the relay one, the relay two and the relay three. The indicator light displays the opening and closing states of the relay one, the relay two and the relay three under the control of the MCU main control. The standard meter is connected to the relay one, and the meter to be tested is connected to the relay two and the relay three respectively. The MCU main control can test the accuracy of the power-off storage of the meter to be tested by controlling the on and off of the voltage and current of the meter to be tested.

[0006] The MCU main control controls the current on and off of the standard meter through relay 1, the MCU main control controls the current on and off of the meter to be tested through relay 2, and the MCU main control controls the voltage on and off of the meter to be tested through relay 3.

[0007] The relay 2 and the relay perform synchronous opening and closing actions, and the relay 1 performs asynchronous opening and closing actions with the relay 2 and the relay 3 respectively, and ensures that the current of the standard meter and the current of the meter to be tested are applied at opposite times.

[0008] The MCU main control method for controlling the voltage and current of the meter to be tested includes:

[0009] Mode 1: The relay 2 and the relay 3 are closed, the relay 4 is open, current flows through the meter under test, and no current flows through the standard meter;

[0010] Mode 2: The second relay and the third relay are disconnected, and the first relay is closed. Current flows through the standard meter, and no current flows through the meter to be tested.

[0011] The relay 1, the relay 2 and the relay 3 are each provided with a feedback circuit. The MCU main control determines the status of the relay 1, the relay 2 and the relay 3 through the feedback circuit, and displays the opening and closing status of the relay 1, the relay 2 and the relay 3 through an indicator light.

[0012] The feedback circuit is a relay control feedback circuit.

[0013] The standard meter is an electric energy meter from the same batch as the meter to be tested.

[0014] The power-off storage test fixture for an electric energy meter is powered by an equipotential platform.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. This application uses the method of automatically controlling the voltage and current of the meter to be tested to test the accuracy of the power-off storage of the meter to be tested, and uses the electric energy meter of the same batch as the standard meter to facilitate observation of the test results;

[0017] 2. The on-off time of the voltage and current of the meter to be tested in this application can be set by the host computer, and the power-off storage of the electric energy meter under different working conditions can be simulated, making the test operation more convenient and quick. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a connection block diagram of the control part of the utility model;

[0019] Figure 2 It is a connection block diagram of the test part of the utility model;

[0020] Figure 3 It is a circuit diagram of the feedback circuit of the utility model;

[0021] In the figure, 1. MCU main control, 2. 485 communication module, 3. indicator light, 4. relay, 5. relay, 6. relay, 7. standard meter, 8. meter to be tested, 9. relay drive coil, 10. relay main circuit, 11. opening and closing feedback switch, 12. signal output port. DETAILED DESCRIPTION

[0022] The present invention will be described in detail below with reference to the accompanying drawings. Figure 1-3 As shown;

[0023] A three-phase, four-wire power supply used in a power-off storage test fixture for electric energy meters is an equipotential platform with synchronous voltage and current outputs. Relays 1 (4), 2 (5), and 3 (6) are all magnetic latching relays, guaranteed to operate 100,000 times under dummy load. Standard meter 7 is from the same batch of electric energy meters as meter 8 under test. Relay 1 (4) controls the current of standard meter 7, relay 2 (5) controls the current of meter 8 under test, and relay 3 (6) controls the voltage of meter 8 under test. Relays 2 (5) and 3 (6) operate as a synchronous group, opening and closing simultaneously. Relay 1 (4) operates asynchronously with relays 2 (5) and 3 (6), ensuring that the current of standard meter 7 and the current of meter 8 under test are applied at opposite times. Relays 1 (4), 2 (5), and 3 (6) all have built-in feedback circuits. MCU main control 1 can determine the status of relays 1 (4), 2 (5), and 3 (6), and display the open and closed status of each relay on indicator light 3.

[0024] During the test, the voltage and current of the meter under test (8) are simultaneously cut off and on, simulating the on-site conditions of a load-carrying electric energy meter. The standard meter (7) only cuts off the current, not the voltage, to ensure measurement accuracy.

[0025] There are two ways to test the tooling:

[0026] Method 1: Relay 2 5 and relay 3 6 are closed, relay 1 4 is open, current flows through the meter under test 8, and no current flows through the standard meter 7.

[0027] Method 2: Relay 2 5 and relay 3 6 are disconnected, relay 1 4 is closed, current flows through the standard meter 7, and there is no current in the meter to be tested 8.

[0028] MCU main control 1 uses an internal high-precision clock to ensure that the duration of mode 1 and mode 2 is consistent. The host computer sets the status switching time of the tooling through the 485 communication module. The shortest setting can be set to one minute.

[0029] After the test is complete, the energy flow through the meter under test (8) is compared with that of the standard meter (7) to determine the accuracy and stability of the data stored during repeated power cycles. This tool can simulate the power cycle conditions of the meter in high and low temperatures, as well as in hot and humid environments, to verify the accuracy of the meter data.

[0030] It should be noted that the feedback circuit is a relay-controlled feedback circuit, which includes: a relay drive coil 9, a relay main circuit 10, an opening and closing feedback switch 11, and a signal output port 12. The relay drive coil drives the relay's internal opening and closing switch through the relay main circuit to open and close. The relay drive coil drives the opening and closing of the relay and simultaneously activates the opening and closing feedback switch. The opening and closing feedback switch outputs a passive digital switching signal through the signal output port. The MCU determines the opening and closing status of the relay by detecting the digital switching signal.

[0031] It should be noted that, in this document, relational terms such as first and second, etc., are used only 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. Moreover, the terms "include," "comprise," or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations. The phrase "includes an element defined by..." does not exclude the presence of other identical elements in the process, method, article, or device that includes the element.

[0032] The above technical solutions only reflect the preferred technical solutions of the present utility model. Any changes that may be made to certain parts thereof by technicians in this technical field all reflect the principles of the present utility model and fall within the scope of protection of the present utility model.

Claims

1. A power-off storage test tool for an electric energy meter, comprising an MCU main control (1), a 485 communication module (2), an indicator light (3), a relay 1 (4), a relay 2 (5), a relay 3 (6), a standard meter (7) and a meter to be tested (8), wherein the MCU main control (1) exchanges data with a host computer via the 485 communication module (2), the indicator light (3), the relay 1 (4), the relay 2 (5) and the relay 3 (6) are respectively connected to the MCU main control (1), and is characterized in that: The standard meter (7) is connected to the relay 1 (4), and the meter to be tested (8) is connected to the relay 2 (5) and the relay 3 (6) respectively. The MCU main control (1) can test the accuracy of the power-off storage of the meter to be tested (8) by controlling the voltage and current of the meter to be tested (8) to be turned on and off.

2. The power-off storage test tool for electric energy meters according to claim 1, characterized in that: The MCU main control (1) controls the current on and off of the standard meter (7) through the relay 1 (4), the MCU main control (1) controls the current on and off of the meter to be tested (8) through the relay 2 (5), and the MCU main control (1) controls the voltage on and off of the meter to be tested (8) through the relay 3 (6).

3. The power-off storage test tool for electric energy meters according to claim 2, characterized in that: The relay 2 (5) and the relay 3 (6) perform synchronous opening and closing actions, and the relay 1 (4) performs asynchronous opening and closing actions with the relay 2 (5) and the relay 3 (6) respectively.

4. The power-off storage test tool for electric energy meters according to claim 3, characterized in that: When the relay 2 (5) and the relay 3 (6) are closed, the relay 1 (4) is disconnected; When the relay 2 (5) and the relay 3 (6) are disconnected, the relay 1 (4) is closed.

5. The power-off storage test tool for electric energy meters according to claim 4, characterized in that: The relay 1 (4), the relay 2 (5) and the relay 3 (6) are all provided with feedback circuits, and the MCU main control (1) can judge the opening and closing states of the relay 1 (4), the relay 2 (5) and the relay 3 (6) through the feedback circuits.

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