A test device and test method for measuring temperature of an internet of things table terminal seat

Abstract

The application provides a test device and method for measuring temperature of an Internet of Things meter terminal block, comprising: powering on the tested Internet of Things meter, and controlling the temperature of the terminal block of the Internet of Things meter to be at an initial temperature by a host computer; a temperature control unit controls a heating unit to heat the terminal block of the tested Internet of Things meter to a first set temperature according to any one or more of a preset terminal block temperature linear test item, an overheating alarm event test item, a terminal block temperature dramatic change event test item, a terminal block overheating trip event test item and a terminal block temperature imbalance event test item; the host computer communicates with the Internet of Things meter, reads data corresponding to each test item reported by the Internet of Things meter, and determines the accuracy of temperature measurement of the tested Internet of Things meter or whether a terminal block temperature abnormal event can be triggered at the first set temperature according to the data. In the application, all test items can be detected at one time, and manual intervention is not needed in the test process, so that the test efficiency is greatly improved.

Description

Technical Field

[0001] This invention relates to the field of power equipment technology, and more specifically, to a test device and test method for measuring the temperature of IoT meter terminal blocks. Background Technology

[0002] Current calibration devices for electricity meter terminal temperature detection are used to verify the accuracy of electricity meter terminal temperature measurement. They apply a preset temperature to the terminals and then compare the preset value with the actual measured temperature value to check the accuracy of the temperature reading. However, existing calibration devices have the following drawbacks: they cannot provide a clear description of the monitoring accuracy (IoT meters require a temperature accuracy of ±5℃), and they cannot simulate other temperature events such as terminal overheating alarms, sudden temperature changes, overheating tripping, and temperature imbalance. Summary of the Invention

[0003] In view of this, the present invention proposes a test device and test method for measuring the temperature of IoT meter terminal blocks, aiming to solve the problem that existing calibration devices cannot generate abnormal temperatures at the terminals of the IoT meter under test.

[0004] In one aspect, the present invention proposes a test device for temperature measurement of IoT meter terminal blocks, comprising: a host computer, a temperature control unit, a heating unit, and a temperature measurement unit; wherein,

[0005] The host computer is used to send corresponding control commands to the temperature control unit according to any one or more of the pre-set test items;

[0006] The test items include: terminal block temperature linearity test, overheat alarm event test, terminal block temperature drastic change event test, terminal block overheat trip event test, and terminal block temperature imbalance event.

[0007] The temperature control unit is used to generate a heating command according to the control command and send it to the heating unit;

[0008] The heating unit executes the heating command to heat the terminal block of the IoT meter under test to a first set temperature, triggering any one or more of the following temperature events: terminal block temperature linearity test, overheat alarm event test, terminal block temperature drastic change event test, terminal block overheat trip event test, and terminal block temperature imbalance event test.

[0009] The temperature measurement unit is connected to each terminal block of the IoT device under test to detect the temperature data of the terminal block and send the temperature data to the temperature control unit. The temperature control unit compares the temperature data of the terminal block of the IoT device under test measured by the temperature measurement unit with the first set temperature to determine whether to continue sending a heating command to the heating unit.

[0010] The host computer retrieves the test data reported by the IoT device under test corresponding to each test item, and determines the accuracy of the temperature measurement of the IoT device under test or whether it can trigger an abnormal temperature event of the terminal block at the first set temperature.

[0011] Furthermore, the aforementioned test device for measuring the temperature of IoT meter terminal blocks also includes: a heat dissipation unit; wherein,

[0012] The host computer communicates with the heat dissipation unit to send a cooling command to the heat dissipation unit. The heat dissipation unit executes the cooling command to cool the terminal block of the IoT device under test to a second set temperature, which is not greater than the first set temperature.

[0013] Furthermore, the aforementioned experimental device for measuring the temperature of IoT meter terminal blocks also includes: a first communication unit; wherein,

[0014] The host computer and the temperature control unit communicate through the first communication unit;

[0015] The host computer and the heat dissipation unit communicate through the first communication unit.

[0016] Furthermore, the aforementioned test device for measuring the temperature of IoT meter terminal blocks also includes: a second communication unit; wherein,

[0017] The test IoT table communicates with the host computer through the second communication unit to send the data acquired by its built-in temperature module and the data recorded by the temperature abnormal event recording module to the host computer.

[0018] The test device for measuring the temperature of IoT meter terminal blocks in this invention controls the heating unit to heat the IoT meter under test through a temperature control device, so that relevant test data can be retrieved through a host computer to determine the accuracy of the temperature measurement of the IoT meter under test. At the same time, it can also simulate terminal block temperature linearity, overheating alarm events, terminal block temperature drastic change events, terminal block overheating trip events, and terminal block temperature imbalance events, meeting the various testing requirements of IoT meter terminal blocks and having value for large-scale promotion and application.

[0019] On the other hand, the present invention also proposes a method for testing the temperature of IoT meter terminal blocks, the method comprising the following steps:

[0020] Step 1: The IoT device under test is powered on and running. The host computer controls the temperature of the terminal block of the IoT device under test to be at the initial temperature.

[0021] Step 2: The temperature control unit controls the heating unit to heat the terminal block of the IoT device under test to the first set temperature according to any one or more of the preset terminal block temperature linearity test items, overheat alarm event test items, terminal block temperature drastic change event test items, terminal block overheat trip event test items, and terminal block temperature imbalance event test items.

[0022] Step 3: The host computer communicates with the IoT device under test, reads the data reported by the IoT device under test corresponding to each test item, and determines the accuracy of the temperature measurement of the IoT device under test or whether it can trigger the terminal block temperature abnormality event at the first set temperature.

[0023] Furthermore, in the above-mentioned IoT meter terminal block temperature test method, the terminal block temperature linearity test item includes:

[0024] Step 1: The IoT device under test is powered on and running. The host computer controls the temperature of all terminals of the IoT device under test to be below the first set value.

[0025] Step 2: The temperature control unit controls the heating unit to heat the live wire terminal or A-phase terminal of the IoT meter under test to the first temperature measurement point and maintain it for the first preset time. The host computer reads the terminal temperature reported by the IoT meter under test and the terminal temperature data measured by the temperature measurement unit, compares the difference, and if it exceeds the allowable range, it is determined that the temperature measurement accuracy of the IoT meter under test is unqualified.

[0026] Furthermore, in the above-mentioned IoT meter terminal block temperature test method, the terminal block temperature linearity test item further includes, after step 2:

[0027] Step 3: The host computer controls the heat dissipation unit to cool down all the terminal blocks of the IoT device under test, ensuring that the temperature of all the terminal blocks of the IoT device under test is below the first set value.

[0028] Step 4: The temperature control unit controls the heating unit to heat the live wire terminal or A-phase terminal of the IoT meter under test to the second temperature measuring point and maintain it for the second preset time. The host computer reads the temperature of the terminal block of the IoT meter under test and compares the difference with the terminal block temperature measured by the temperature measuring unit. If the difference exceeds the allowable range, the temperature measurement accuracy of the IoT meter under test is determined to be unqualified.

[0029] Step 5: Repeat steps 1-4 above to sequentially test the temperature measurement accuracy of the neutral terminal or B, C, and N phase terminals of the tested IoT meter at the first and second temperature measurement points, respectively.

[0030] Furthermore, in the above-mentioned IoT meter terminal block temperature test method, the terminal block overheat alarm event test items include:

[0031] Step 1: The IoT device under test is powered on and running. The host computer controls the temperature of all terminals of the IoT device under test to be below the alarm recovery temperature threshold.

[0032] Step 2: The temperature control unit controls the heating unit to heat all the terminals of the IoT device under test to above the alarm temperature threshold and maintain it for a preset time. The host computer reads the time of the most recent overheat alarm recorded by the IoT device under test.

[0033] Furthermore, in the above-mentioned IoT meter terminal block temperature test method, the terminal block overheat alarm event test item further includes, after step 2:

[0034] Step 3: The temperature control unit controls the heat dissipation unit to cool all terminal blocks of the IoT device under test to below the alarm recovery temperature threshold and maintain it for a preset time. The host computer reads the end time of the most recent overheat alarm record of the IoT device under test.

[0035] Step 4: The number of terminal block overheating alarm events recorded by the IoT device under test should be increased. The occurrence and termination time of the terminal block overheating alarm events should be within the time period of the terminal block heating and cooling of the IoT device under test to verify whether the terminal block overheating alarm events of the IoT device under test are correctly generated and terminated under the alarm temperature threshold.

[0036] Furthermore, in the above-mentioned IoT meter terminal block temperature test method, the terminal block temperature drastic change test items include:

[0037] Step 1: The IoT device under test is powered on and running. The host computer controls the temperature of all terminals of the IoT device under test to be below the second set value.

[0038] Step 2: The temperature control unit controls the heating unit to heat the temperature of all terminals of the IoT device under test to the third set value. When the minute temperature change of all terminals of the IoT device under test reaches the threshold, the host computer reads the start time of the temperature change event of all terminals of the IoT device under test.

[0039] Step 3: Continue to wait for the minute-by-minute temperature change of the terminal block of the tested meter to reach the threshold, and record the end time of the sudden temperature change event of the terminal block of the tested IoT meter.

[0040] Step 4: Based on the fact that the number of terminal block temperature change events recorded by the IoT device under test should be increased, and the occurrence and end time of the terminal block overheating alarm event should be within the time period after the IoT device under test has heated up and stabilized, it is verified whether a temperature change event can occur and recover when the terminal block temperature of the IoT device under test rises sharply in a short period of time.

[0041] Furthermore, in the above-mentioned IoT meter terminal block temperature test method, the terminal block overheating trip test item includes:

[0042] Step 1: The IoT device under test is powered on and running. The host computer controls the temperature of all terminals of the IoT device under test to be below the overheating trip recovery temperature threshold.

[0043] Step 2: Turn on the simulated circuit breaker in the host computer. The temperature control unit controls the heating unit to heat all the terminal blocks of the IoT meter under test to above the overheating trip temperature threshold. After waiting for a preset time, the host computer determines whether the IoT meter under test sends a trip command to the simulated circuit breaker; at the same time, it determines whether the IoT meter under test records the overheating trip event.

[0044] Step 3: The host computer reads the most recent overheating trip record from the test IoT table.

[0045] Furthermore, in the above-mentioned IoT meter terminal block temperature test method, the terminal block overheating trip test item further includes, after step 3:

[0046] Step 4: The temperature control unit controls the heat dissipation unit to cool down the temperature of all terminals of the IoT meter under test to below the overheat trip recovery temperature threshold. After waiting for a preset time, the host computer determines whether the IoT meter under test sends a closing permission command to the simulated circuit breaker. After a preset time delay, the host computer controls the simulated circuit breaker to switch to manual closing. At the same time, it determines whether the IoT meter under test records the overheat trip recovery time.

[0047] Step 5: The host computer reads the time of the most recent overheating trip recovery of the IoT meter under test, thereby verifying whether the terminal block of the meter under test can correctly generate trip events and trip recovery events at the configured temperature.

[0048] Furthermore, in the above-mentioned IoT meter terminal block temperature test method, the terminal block temperature imbalance test item includes:

[0049] Step 1: The IoT device under test is powered on and running. The host computer controls the temperature of all terminals of the IoT device under test to be below the fourth set value.

[0050] Step 2: The temperature control unit controls the heating unit to sequentially heat some terminals of the IoT device under test to the fifth set value and wait for the temperature to stabilize. The host computer reads the most recent terminal temperature imbalance event record of the IoT device under test to determine whether the IoT device under test has recorded the occurrence of the temperature imbalance event.

[0051] Furthermore, in the above-mentioned IoT meter terminal block temperature test method, the terminal block temperature imbalance test item further includes, after step 2:

[0052] Step 3: The temperature control unit controls the heat dissipation unit to reduce the temperature of all terminal blocks of the tested IoT meter to below the fourth set value;

[0053] Step 4: The host computer reads the end time of the most recent terminal block temperature imbalance event recorded by the IoT device under test to determine whether the IoT device under test has recorded the end of the temperature imbalance event.

[0054] Step 5: Repeat steps 1-4 to perform temperature tests on the remaining terminal blocks of the IoT device under test to verify whether the IoT device under test can correctly generate temperature imbalance events when the temperature difference between the terminals is too large.

[0055] The testing method provided by this invention, by configuring automatic testing software on the host computer and setting the detection parameters, can complete the detection of all test items at once, without the need for manual intervention during the testing process, which greatly improves the testing efficiency. Attached Figure Description

[0056] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0057] Figure 1 This is a structural block diagram of a test device for measuring the temperature of IoT meter terminal blocks, provided in an embodiment of the present invention. Detailed Implementation

[0058] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the disclosure to those skilled in the art. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0059] See Figure 1The test device for measuring the temperature of IoT meter terminal blocks according to an embodiment of the present invention includes: a host computer, a temperature control unit, a heating unit, and a temperature measurement unit; wherein, the host computer is connected to the temperature control unit and is used to send corresponding control commands to the temperature control unit according to any one or more of the pre-set test items; the test items include: terminal block temperature linearity test item, overheat alarm event test item, terminal block temperature drastic change event test item, terminal block overheat trip event test item, and terminal block temperature imbalance event; the temperature control unit is connected to the heating unit and is used to generate heating commands according to the control commands and send them to the heating unit; the heating unit executes the heating commands to heat the terminal block of the IoT meter under test to a first set temperature, triggering the terminal block temperature linearity test item and the overheat alarm. The test involves the occurrence of one or more temperature events from the following test items: a sudden temperature change event, a terminal block overheating trip event, and a terminal block temperature imbalance event. The temperature measurement unit is connected to each terminal block of the IoT device under test to detect the temperature data of the terminal block and send this data to the temperature control unit. The temperature control unit compares the temperature data of the IoT device under test terminal block measured by the temperature measurement unit with the first set temperature to determine whether to continue sending a heating command to the heating unit. The host computer communicates with the IoT device under test to retrieve the test data reported by the IoT device under test corresponding to each test item, and determines the accuracy of the temperature measurement of the IoT device under test or whether it can trigger a terminal block temperature abnormality event at the first set temperature.

[0060] Specifically, the host computer has an embedded detection unit that detects and records the actual internal temperature of all terminals in the power meter terminal block. The temperature detection accuracy is ±1℃ and is traceable. The temperature detection data must have both on-site and remote reading modes.

[0061] The IoT device under test (DUT) and the heating unit use a quick-connect method via a meter holder. Specifically, the DUT connects to the meter holder via a plug-in connection. The meter holder includes a meter holder body and a wiring frame. The wiring frame is mounted on top of the meter holder body via a mounting bracket and has multiple connectors for connecting to the DUT. The meter holder slider is made of high-temperature resistant (300℃) flame-retardant insulating material with high strength. The heating unit can be a heating rod. The temperature measurement unit connects to each terminal block. During testing, each time the temperature data of the IoT device is read, the data from all terminals is also read. Subsequent data transmission and processing are performed according to different tests to obtain the temperature data from different terminals.

[0062] The temperature control unit has both manual and remote setting modes, with temperature setting increments of 1℃ and a heating rate of no less than 30℃ / minute. The heating unit's heating temperature range is 25℃~180℃.

[0063] In this embodiment, there can be multiple heating units, which can work individually or in concert, and can be flexibly combined according to the requirements of the test project.

[0064] This embodiment also includes a programmable power supply; wherein the programmable power supply is connected to the IoT meter under test to supply power to it. The programmable power supply supplies power to the IoT meter and is applied to the metal surface of part of the heating unit (corresponding to the live and neutral wires of the IoT meter terminal block). During the test, the IoT meter terminals are fitted onto the heating rod and secured with screws on the IoT meter. When the programmable power supply is powered on, the power supply contacts the IoT meter power terminals through the metal surface of the heating rod, thereby supplying power to the IoT meter. The host computer sends control commands to the programmable power supply through the communication unit, and the programmable power supply switches to the corresponding mode to supply power to the IoT meter according to the commands.

[0065] The temperature control unit is powered by the device's 220V power distribution module. The heat dissipation unit mainly supplies power to the fan and motor. The fan is powered from the 220V power distribution module via control, enabling the fan to start and stop. The motor is powered by a 24V switching power supply via control. The heating unit is powered by the power distribution module through an isolated power supply, controlled by the temperature control unit. Preferably, in this embodiment, it further includes a heat dissipation unit; wherein the host computer communicates with the heat dissipation unit to send a cooling command to the heat dissipation unit, and the heat dissipation unit executes the cooling command to cool the terminal block of the IoT device under test to a second set temperature, which is not greater than the first set temperature. The first and second set temperatures are determined according to the requirements of different test items.

[0066] In this embodiment, it further includes: a first communication unit; wherein the host computer and the temperature control unit communicate through the first communication unit; the host computer and the heat dissipation unit communicate through the first communication unit.

[0067] The temperature control unit controls the power supply (isolated power supply) of the heating unit by controlling a solid-state relay.

[0068] The host computer communicates with the temperature control unit (RS485) through the first communication unit, enabling operations such as rapid heating of the heating unit and data reading.

[0069] Furthermore, it also includes a second communication unit; wherein the test IoT device communicates with the host computer through the second communication unit to send data acquired by its built-in temperature module and data recorded by its temperature anomaly event recording module to the host computer. The second communication unit is a Bluetooth module.

[0070] After the second communication unit (Bluetooth) establishes a Bluetooth connection with the IoT meter under test, it acts as a simulated Bluetooth micro-terminal. The host computer controls the heating unit to heat the IoT meter under test, while simultaneously monitoring the received data from the communication unit (Bluetooth). When the IoT meter under test detects an abnormal terminal temperature, it should automatically send relevant commands to control the Bluetooth micro-interrupt. The host computer can then make a judgment after monitoring these commands. This verifies the energy meter's control function over the Bluetooth micro-interrupt during temperature events.

[0071] Obviously, this embodiment also includes a housing, which is a cabinet-type structure. The host computer, temperature control unit, heating unit and temperature measurement unit are placed inside it, and the display and keyboard are installed on the side of the device and can be freely extended and retracted.

[0072] It is evident from the above that the test device for measuring the temperature of IoT meter terminal blocks provided in this embodiment controls the heating unit to heat the IoT meter under test through a temperature control device, so as to retrieve relevant test data through a host computer, thereby judging the accuracy of the temperature measurement of the IoT meter under test. At the same time, it can also simulate terminal block temperature linearity, overheating alarm events, terminal block temperature drastic events, terminal block overheating trip events, and terminal block temperature imbalance events, meeting the various testing requirements of IoT meter terminal blocks and having value for large-scale promotion and application.

[0073] The present invention also provides a method for testing the temperature of IoT meter terminal blocks, comprising:

[0074] Step S1: The IoT device under test is powered on and running. The host computer controls the temperature of the terminal block of the IoT device under test to be at the initial temperature. This initial temperature is determined according to the specific test requirements.

[0075] In step S2, the temperature control unit controls the heating unit to heat the terminal block of the IoT device under test to a first set temperature according to one or more of the preset terminal block temperature linearity test items, overheat alarm event test items, terminal block temperature drastic change event test items, terminal block overheat trip event test items, and terminal block temperature imbalance event test items. The first set temperature is determined according to the specific test item requirements.

[0076] Step S3: The host computer communicates with the IoT device under test, reads the data reported by the IoT device under test corresponding to each test item, and determines the accuracy of the temperature measurement of the IoT device under test or whether it can trigger an abnormal temperature event of the terminal block at the first set temperature.

[0077] The embodiments of the present invention are described in detail below for each test item:

[0078] Terminal block temperature linearity test items include:

[0079] Step 1: The IoT device under test is powered on and running. The host computer controls the temperature of all terminals of the IoT device under test to be below the first set value; the first set value can be 65℃.

[0080] Step 2: The temperature control unit controls the heating unit to heat the live wire terminal or A-phase terminal of the IoT device under test to the first temperature measurement point and maintain it for a first preset time. The host computer reads the terminal temperature reported by the IoT device under test and compares it with the terminal temperature data measured by the temperature measurement unit. If the difference exceeds the allowable range, the temperature measurement accuracy of the IoT device under test is determined to be unqualified. The first temperature measurement point can be 115℃; the first preset time can be 10 minutes.

[0081] Furthermore, in this experimental project, step 2 is followed by:

[0082] Step 3: The host computer controls the heat dissipation unit to cool down all the terminal blocks of the IoT device under test, ensuring that the temperature of all the terminal blocks of the IoT device under test is below the first set value.

[0083] Step 4: The temperature control unit controls the heating unit to heat the live wire terminal or A-phase terminal of the IoT meter under test to the second temperature measuring point and maintain it for the second preset time. The host computer reads the temperature of the terminal block of the IoT meter under test and compares it with the terminal block temperature measured by the temperature measuring unit. If the difference exceeds the allowable range, the temperature measurement accuracy of the IoT meter under test is judged to be unqualified. The second temperature measuring point can be 135℃; the second preset time can be 10 minutes.

[0084] Step 5: Repeat steps 1-4 above, sequentially testing the temperature measurement accuracy of the neutral terminal or B, C, N phase terminals of the tested IoT meter at the first and second temperature measurement points, respectively. Continue following the above procedure to test the temperature linearity of the neutral terminal of the single-phase meter and the B, C, N phase terminals of the three-phase meter at the first and second temperature measurement points, respectively.

[0085] The terminal block overheat alarm event test items include:

[0086] Step 1: The IoT device under test is powered on and running. The host computer controls the temperature of all terminals of the IoT device under test to be below the alarm recovery temperature threshold.

[0087] Step 2: The temperature control unit controls the heating unit to heat all terminal blocks of the IoT device under test to above the alarm temperature threshold and maintain this temperature for a preset duration. The host computer reads the time of the most recent overheat alarm recorded by the IoT device under test. The preset duration can be 25 seconds. The host computer reads the test data from the IoT device under test via Bluetooth.

[0088] Furthermore, in the terminal block overheat alarm event test project, step 2 also includes:

[0089] Step 3: The temperature control unit controls the heat dissipation unit to cool all terminal blocks of the IoT device under test to below the alarm recovery temperature threshold and maintains the temperature for a preset duration. The host computer reads the end time of the most recent overheat alarm record of the IoT device under test. The preset duration can be 25 seconds.

[0090] Step 4: The number of terminal block overheating alarm events recorded by the IoT device under test should be increased. The occurrence and termination time of the terminal block overheating alarm events should be within the time period of the terminal block heating and cooling of the IoT device under test to verify whether the terminal block overheating alarm events of the IoT device under test are correctly generated and terminated under the alarm temperature threshold.

[0091] Terminal block temperature change test items include:

[0092] Step 1: Power on the IoT device under test and run it. The host computer controls the temperature of all terminals of the IoT device under test to be below the second set value; the second set value can be 90℃.

[0093] Step 2: The temperature control unit controls the heating unit to heat all the terminals of the IoT device under test to the third set value. Once the temperature change per minute of all the terminals of the IoT device under test reaches the threshold, the host computer reads the start time of the temperature change event of all the terminals of the IoT device under test. The third set value can be 145°C, and the threshold for the temperature change per minute can be 15 degrees / minute.

[0094] Step 3: Continue to wait for the minute-by-minute temperature change of the terminal block of the tested IoT meter to reach the threshold, and record the end time of the sudden temperature change event of the terminal block of the tested IoT meter; the waiting time can be 30 seconds.

[0095] Step 4: Based on the fact that the number of terminal block temperature change events recorded by the IoT device under test should be increased, and the occurrence and end time of the terminal block overheating alarm event should be within the time period after the IoT device under test has heated up and stabilized, it is verified whether a temperature change event can occur and recover when the terminal block temperature of the IoT device under test rises sharply in a short period of time.

[0096] The terminal block overheating trip test items include:

[0097] Step 1: Power on the IoT device under test and run it. The host computer controls the temperature of all terminals of the IoT device under test to be below the overheating trip recovery temperature threshold. The overheating trip recovery temperature threshold can be 90℃.

[0098] Step 2: Turn on the simulated circuit breaker in the host computer. The temperature control unit controls the heating unit to heat all the terminals of the IoT meter under test to above the overheat tripping temperature threshold. After a preset time, the host computer determines whether the IoT meter under test sends a tripping command to the simulated circuit breaker; at the same time, it determines whether the IoT meter under test records an overheat tripping event. The simulated circuit breaker is a virtual circuit breaker created by the host computer using software. The simulated circuit breaker establishes a Bluetooth connection with the IoT meter under test through the second communication unit (Bluetooth). After receiving the tripping or closing command from the IoT meter under test, it generates a tripping or closing action. The preset time can be 25 seconds.

[0099] Step 3: The host computer reads the most recent overheating trip record from the test IoT table.

[0100] In the terminal block overheating trip test, step 3 includes the following:

[0101] Step 4: The temperature control unit controls the heat dissipation unit to cool down the temperature of all terminals of the IoT meter under test to below the overheat trip recovery temperature threshold. After waiting for a preset time, the host computer determines whether the IoT meter under test sends a closing permission command to the simulated circuit breaker. After a preset time delay, the host computer controls the simulated circuit breaker to switch to manual closing. At the same time, it determines whether the IoT meter under test records the overheat trip recovery time. The preset time can be 25 seconds.

[0102] Step 5: The host computer reads the time of the most recent overheating trip recovery of the IoT meter under test, thereby verifying whether the terminal block of the meter under test can correctly generate trip events and trip recovery events at the configured temperature.

[0103] Terminal block temperature imbalance test items include:

[0104] Step 1: Power on the IoT device under test and run it. The host computer controls the temperature of all terminals of the IoT device under test to be below the fourth set value; the fourth set value is 40℃.

[0105] Step 2: The temperature control unit controls the heating unit to sequentially heat some terminals of the IoT device under test to the fifth set value and waits for the temperature to stabilize. The host computer reads the most recent terminal temperature imbalance event record of the IoT device under test to determine whether the IoT device under test has recorded the occurrence of a temperature imbalance event. The fifth set value is 80℃.

[0106] In the terminal block temperature imbalance test, step 2 includes the following:

[0107] Step 3: The temperature control unit controls the heat dissipation unit to reduce the temperature of all terminal blocks of the tested IoT meter to below the fourth set value;

[0108] Step 4: The host computer reads the end time of the most recent terminal block temperature imbalance event recorded by the IoT device under test to determine whether the IoT device under test has recorded the end of the temperature imbalance event.

[0109] Step 5: Repeat steps 1-4 to perform temperature tests on the remaining terminals of the IoT meter under test to verify whether the IoT meter under test can correctly generate a temperature imbalance event when the temperature difference between the terminals is too large. For single-phase meters, the live wire terminal and the neutral wire terminal can be tested in sequence; for three-phase meters, the A-phase terminal, B-phase terminal, C-phase terminal and D-phase terminal can be tested in sequence.

[0110] The relevant parts of the method embodiments and the above-described device embodiments can be referred to each other, and will not be repeated here.

[0111] The testing method provided by this invention, by configuring automatic testing software on the host computer and setting the detection parameters, can complete the detection of all test items at once, without the need for manual intervention during the testing process, which greatly improves the testing efficiency.

[0112] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A method for testing the temperature of an IoT meter terminal block, characterized in that, Includes the following steps: Step 1: The IoT device under test is powered on and running. The host computer controls the temperature of the terminal block of the IoT device under test to be at the initial temperature. Step 2: The temperature control unit controls the heating unit to heat the terminal block of the IoT device under test to the first set temperature according to any one or more of the preset terminal block temperature linearity test items, overheat alarm event test items, terminal block temperature drastic change event test items, terminal block overheat trip event test items, and terminal block temperature imbalance event test items. The terminal block temperature linearity test includes: Step 21: The IoT device under test is powered on and running. The host computer controls the temperature of all terminals of the IoT device under test to be below the first set value. Step 22: The temperature control unit controls the heating unit to heat the live wire terminal or A-phase terminal of the IoT meter under test to the first temperature measurement point and maintain it for the first preset time. The host computer reads the terminal temperature reported by the IoT meter under test and the terminal temperature data measured by the temperature measurement unit, compares the difference, and if it exceeds the allowable range, it is determined that the temperature measurement accuracy of the IoT meter under test is unqualified. In the terminal block temperature linearity test, step 22 is followed by: Step 23: The host computer controls the heat dissipation unit to cool down all the terminal blocks of the IoT device under test, ensuring that the temperature of all the terminal blocks of the IoT device under test is below the first set value. Step 24: The temperature control unit controls the heating unit to heat the live wire terminal or A-phase terminal of the IoT meter under test to the second temperature measuring point and maintain it for the second preset time. The host computer reads the temperature of the terminal block of the IoT meter under test and compares the difference with the terminal block temperature measured by the temperature measuring unit. If the difference exceeds the allowable range, the temperature measurement accuracy of the IoT meter under test is determined to be unqualified. Step 25: Repeat steps 21-24 above to sequentially test the temperature measurement accuracy of the neutral terminal or B, C, and N phase terminals of the tested IoT meter at the first and second temperature measurement points, respectively. Step 3: The host computer communicates with the IoT device under test, reads the data reported by the IoT device under test corresponding to each test item, and determines the accuracy of the temperature measurement of the IoT device under test or whether it can trigger the terminal block temperature abnormality event at the first set temperature.

2. The method for conducting tests using the test apparatus for measuring temperature at IoT meter terminal blocks according to claim 1, characterized in that, The terminal block overheat alarm event test items include: Step 1: The IoT device under test is powered on and running. The host computer controls the temperature of all terminals of the IoT device under test to be below the alarm recovery temperature threshold. Step 2: The temperature control unit controls the heating unit to heat all the terminals of the IoT device under test to above the alarm temperature threshold and maintain it for a preset time. The host computer reads the time of the most recent overheat alarm recorded by the IoT device under test.

3. The method for conducting tests using the test apparatus for measuring temperature at IoT meter terminal blocks according to claim 2, characterized in that, The terminal block overheat alarm event test project also includes the following after step 2: Step 3: The temperature control unit controls the heat dissipation unit to cool all terminal blocks of the IoT device under test to below the alarm recovery temperature threshold and maintain it for a preset time. The host computer reads the end time of the most recent overheat alarm record of the IoT device under test. Step 4: The number of terminal block overheating alarm events recorded by the IoT device under test should be increased. The occurrence and termination time of the terminal block overheating alarm events should be within the time period of the terminal block heating and cooling of the IoT device under test to verify whether the terminal block overheating alarm events of the IoT device under test are correctly generated and terminated under the alarm temperature threshold.

4. The method for conducting tests using the test apparatus for measuring temperature at IoT meter terminal blocks according to claim 1, characterized in that, The terminal block temperature drastic change test includes: Step 1: The IoT device under test is powered on and running. The host computer controls the temperature of all terminals of the IoT device under test to be below the second set value. Step 2: The temperature control unit controls the heating unit to heat the temperature of all terminals of the IoT device under test to the third set value. When the minute temperature change of all terminals of the IoT device under test reaches the threshold, the host computer reads the start time of the temperature change event of all terminals of the IoT device under test. Step 3: Continue to wait for the minute-by-minute temperature change of the terminal block of the tested meter to reach the threshold, and record the end time of the sudden temperature change event of the terminal block of the tested IoT meter. Step 4: Based on the fact that the number of terminal block temperature change events recorded by the IoT device under test should be increased, and the occurrence and end time of the terminal block overheating alarm event should be within the time period after the IoT device under test has heated up and stabilized, it is verified whether a temperature change event can occur and recover when the terminal block temperature of the IoT device under test rises sharply in a short period of time.

5. The method for conducting tests using the test apparatus for measuring the temperature of IoT meter terminal blocks according to claim 1, characterized in that, The terminal block overheating trip test items include: Step 1: The IoT device under test is powered on and running. The host computer controls the temperature of all terminals of the IoT device under test to be below the overheating trip recovery temperature threshold. Step 2: Turn on the simulated circuit breaker in the host computer. The temperature control unit controls the heating unit to heat all the terminal blocks of the IoT meter under test to above the overheating trip temperature threshold. After waiting for a preset time, the host computer determines whether the IoT meter under test sends a trip command to the simulated circuit breaker; at the same time, it determines whether the IoT meter under test records the overheating trip event. Step 3: The host computer reads the most recent overheating trip record from the test IoT table.

6. The method for conducting tests using the test apparatus for measuring the temperature of IoT meter terminal blocks according to claim 5, characterized in that, In the terminal block overheating trip test, step 3 is followed by: Step 4: The temperature control unit controls the heat dissipation unit to cool down the temperature of all terminals of the IoT meter under test to below the overheat trip recovery temperature threshold. After waiting for a preset time, the host computer determines whether the IoT meter under test sends a closing permission command to the simulated circuit breaker. After a preset time delay, the host computer controls the simulated circuit breaker to switch to manual closing. At the same time, it determines whether the IoT meter under test records the overheat trip recovery time. Step 5: The host computer reads the time of the most recent overheating trip recovery of the IoT meter under test, thereby verifying whether the terminal block of the meter under test can correctly generate trip events and trip recovery events at the configured temperature.

7. The method for conducting tests using the test apparatus for measuring temperature at IoT meter terminal blocks according to claim 1, characterized in that, The terminal block temperature imbalance test items include: Step 1: The IoT device under test is powered on and running. The host computer controls the temperature of all terminals of the IoT device under test to be below the fourth set value. Step 2: The temperature control unit controls the heating unit to sequentially heat some terminals of the IoT device under test to the fifth set value and wait for the temperature to stabilize. The host computer reads the most recent terminal temperature imbalance event record of the IoT device under test to determine whether the IoT device under test has recorded the occurrence of the temperature imbalance event.

8. The method for conducting tests using the test apparatus for measuring temperature at IoT meter terminal blocks according to claim 7, characterized in that, In the terminal block temperature imbalance test, step 2 is followed by: Step 3: The temperature control unit controls the heat dissipation unit to reduce the temperature of all terminal blocks of the tested IoT meter to below the fourth set value; Step 4: The host computer reads the end time of the most recent terminal block temperature imbalance event recorded by the IoT device under test to determine whether the IoT device under test has recorded the end of the temperature imbalance event. Step 5: Repeat steps 1-4 to perform temperature tests on the remaining terminal blocks of the IoT device under test to verify whether the IoT device under test can correctly generate temperature imbalance events when the temperature difference between the terminals is too large.

9. A test apparatus employing the IoT meter terminal block temperature test method as described in claim 1, characterized in that, include: The system comprises a host computer, a temperature control unit, a heating unit, and a temperature measurement unit; among which, The host computer is used to send corresponding control commands to the temperature control unit according to any one or more of the pre-set test items; The test items include: terminal block temperature linearity test, overheat alarm event test, terminal block temperature drastic change event test, terminal block overheat trip event test, and terminal block temperature imbalance event. The temperature control unit is used to generate a heating command according to the control command and send it to the heating unit; The heating unit executes the heating command to heat the terminal block of the IoT meter under test to a first set temperature, triggering any one or more of the following temperature events: terminal block temperature linearity test, overheat alarm event test, terminal block temperature drastic change event test, terminal block overheat trip event test, and terminal block temperature imbalance event test. The temperature measurement unit is connected to each terminal block of the IoT device under test to detect the temperature data of the terminal block and send the temperature data to the temperature control unit. The temperature control unit compares the temperature data of the terminal block of the IoT device under test measured by the temperature measurement unit with the first set temperature to determine whether to continue sending a heating command to the heating unit. The host computer retrieves the test data reported by the IoT device under test corresponding to each test item, and determines the accuracy of the temperature measurement of the IoT device under test or whether it can trigger an abnormal temperature event of the terminal block at the first set temperature.

10. The experimental apparatus according to claim 9, characterized in that, Also includes: Heat dissipation unit; wherein, The host computer communicates with the heat dissipation unit to send a cooling command to the heat dissipation unit. The heat dissipation unit executes the cooling command to cool the terminal block of the IoT device under test to a second set temperature, which is not greater than the first set temperature.

11. The test apparatus according to claim 10, characterized in that, Also includes: First communication unit; wherein The host computer and the temperature control unit communicate through the first communication unit; The host computer and the heat dissipation unit communicate through the first communication unit.

12. The experimental apparatus according to claim 9, characterized in that, Also includes: The second communication unit; wherein, The test IoT table communicates with the host computer through the second communication unit to send the data acquired by its built-in temperature module and the data recorded by the temperature abnormal event recording module to the host computer.

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