Temperature and humidity control system and method for testing electronic transformer

Abstract

The invention discloses a temperature and humidity control system for testing an electronic mutual inductor, and relates to the field of electronic mutual inductor testing, the temperature and humidity control system for testing the electronic mutual inductor comprises an acquisition unit which comprises a temperature and humidity sensor arranged in an environment simulation box and used for acquiring temperature and humidity data in the environment simulation box; the control unit is used for receiving the data acquired by the acquisition unit and processing the data; and the execution unit is used for changing the temperature and humidity data in the environment simulation box according to the instruction of the control unit. Accurate temperature control output can be calculated through an output formula according to the deviation between the current temperature and the average value of the set temperature and humidity threshold values and the proportionality coefficient, the proportionality coefficient can be adjusted according to the specific requirements of the system so as to achieve finer temperature control, and the system can respond to the temperature deviation more quickly through the adjusted value. And steady-state errors are reduced, so that the temperature and the humidity in the environment simulation box are accurately controlled.

Description

Technical Field

[0001] The invention relates to the technical field of electronic transformer testing, in particular to a temperature and humidity control system and method for electronic transformer testing. Background Art

[0002] An electronic instrument transformer is a power distribution device consisting of one or more voltage or current sensors connected to a transmission system and a secondary converter to transmit a quantity proportional to the measured value to supply measuring instruments, meters and relay protection or control devices.

[0003] After the electronic transformer is produced, it needs to be tested. During the test, in order to simulate the use environment as much as possible, it needs to be used in an environmental simulation box. During the test of the electronic transformer, simulating the actual use environment is crucial to ensure the accuracy and reliability of the test results. However, traditional temperature and humidity control systems often have problems such as low control accuracy, slow response speed, and poor stability, which may lead to large differences between the test data and the data in the actual use environment, thereby affecting the accurate evaluation of the performance of the electronic transformer. Summary of the invention

[0004] In view of the above problems existing in the prior art, the present invention is proposed.

[0005] Therefore, the problem to be solved by the present invention is that the traditional control system has low control accuracy, slow response speed and poor stability.

[0006] To solve the above technical problems, in a first aspect, the present invention provides the following technical solutions: a temperature and humidity control system for testing an electronic transformer, comprising: an acquisition unit, including a temperature and humidity sensor, which is arranged in an environmental simulation box and is used to collect temperature and humidity data in the environmental simulation box; a control unit, which is used to receive the data collected by the acquisition unit and perform data processing; and an execution unit, which changes the temperature and humidity data in the environmental simulation box according to the instructions of the control unit.

[0007] As a preferred solution of the temperature and humidity control system for testing electronic transformers of the present invention, the control unit is configured with a control algorithm, and the control algorithm controls the temperature and humidity output of the execution unit, wherein the temperature output is:

[0008]

[0009] in, Indicates the average value of the set temperature threshold, Kp indicates the proportional coefficient, and Tb indicates the current temperature;

[0010] The humidity output is:

[0011]

[0012] Among them, among them, It represents the average value of the set humidity threshold, KP represents the proportional coefficient, and TB represents the current temperature.

[0013] As a preferred solution of the temperature and humidity control system for testing an electronic transformer of the present invention, the execution unit includes a heater, a refrigerator, a humidifier and a dehumidifier.

[0014] As a preferred solution of the temperature and humidity control system for testing an electronic transformer of the present invention, the control unit includes a single chip microcomputer, a memory and a signal conversion module.

[0015] In a second aspect, the present invention also provides a temperature and humidity control method for testing an electronic transformer, which is applicable to the above-mentioned control system, and comprises collecting temperature and humidity data in an environmental simulation box through a collection unit; a control unit receives the data collected by the collection unit and calculates and issues instructions according to a configured algorithm; an execution unit changes the temperature and humidity data in the environmental simulation box according to the instructions.

[0016] As a preferred solution of the temperature and humidity control method for testing an electronic transformer of the present invention, the acquisition unit includes a temperature and humidity sensor, and the execution unit includes a heater, a refrigerator, a humidifier and a dehumidifier.

[0017] As a preferred solution of the temperature and humidity control method for testing an electronic transformer according to the present invention, the control unit includes a single-chip microcomputer, a memory and a signal conversion module, the single-chip microcomputer is configured with a control algorithm, and the control algorithm controls the temperature and humidity output of the execution unit, wherein the temperature output is:

[0018]

[0019] in, Indicates the average value of the set temperature threshold, Kp indicates the proportional coefficient, and Tb indicates the current temperature;

[0020] The humidity output is:

[0021]

[0022] Among them, among them, It represents the average value of the set humidity threshold, KP represents the proportional coefficient, and TB represents the current temperature.

[0023] As a preferred solution of the temperature and humidity control method for testing an electronic transformer according to the present invention, the method for obtaining the proportional coefficient Kp includes setting an initial value of the proportional coefficient Kp; bringing the initial value of the proportional coefficient Kp into system operation and recording relevant parameters; observing the response of the system to input changes. If the system responds too fast, it indicates that the value of the proportional coefficient Kp is too large and needs to be reduced; if the system responds too fast, it indicates that the value of the proportional coefficient Kp is too small and needs to be increased; the method for obtaining the proportional coefficient KP is the same as the proportional coefficient Kp.

[0024] The beneficial effects of the present invention are as follows: the temperature and humidity control system for testing an electronic transformer can calculate an accurate temperature control output through a proportional coefficient according to the deviation between the current temperature and the average value of the set temperature and humidity threshold values ​​through an output formula. The proportional coefficient can be adjusted according to the specific needs of the system to achieve more precise temperature control. Through the adjusted value, the system can respond to temperature deviations more quickly and reduce steady-state errors, thereby achieving precise control of the temperature and humidity in the environmental simulation box, providing a more reliable and accurate temperature and humidity environment for testing electronic transformers. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 This is the structural block diagram of the temperature and humidity control system for testing electronic transformers.

[0027] Figure 2 This is a schematic diagram of the hardware structure of the temperature and humidity control system for electronic transformer testing.

[0028] Figure 3 This is the circuit diagram of the temperature and humidity sensor described in Example 2.

[0029] Figure 4 This is the memory circuit diagram described in Example 2.

[0030] Figure 5 This is the circuit diagram of the signal conversion module described in Example 2.

[0031] Figure 6 This is a circuit diagram of the execution unit described in Example 2. DETAILED DESCRIPTION

[0032] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0033] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0034] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor is it an embodiment that is mutually exclusive with other embodiments, either individually or selectively.

[0035] Example 1

[0036] Reference Figure 1 and Figure 2 , which is the first embodiment of the present invention, and this embodiment provides a temperature and humidity control system for testing an electronic transformer. The temperature and humidity control system for testing an electronic transformer includes a collection unit 100, a control unit 200 and an execution unit 300.

[0037] Specifically, the acquisition unit 100 includes a temperature and humidity sensor installed in the environment simulation box for real-time monitoring and collecting temperature and humidity data in the environment simulation box. The temperature and humidity sensor transmits the collected data to the control unit 200 via wired or wireless communication.

[0038] The control unit 200 is the core component of the system, responsible for receiving data from the temperature and humidity sensor, and performing calculations and controls according to preset temperature and humidity thresholds. The control unit 200 has a built-in control algorithm, which can calculate the output of the execution unit 300 based on the difference between the real-time data and the preset threshold. The control unit 200 includes a single-chip microcomputer 201, a memory 202, and a signal conversion module 203.

[0039] The execution unit 300 includes a heater, a refrigerator, a humidifier and a dehumidifier. The execution unit 300 is used to change the temperature and humidity environment in the environmental simulation box. The temperature output of the execution unit 300 is:

[0040]

[0041] in, Indicates the average value of the set temperature threshold, Kp indicates the proportional coefficient, and Tb indicates the current temperature;

[0042] The humidity output is:

[0043]

[0044] Among them, among them, It represents the average value of the set humidity threshold, KP represents the proportional coefficient, and TB represents the current temperature.

[0045] Example 2

[0046] Reference Figure 1 to Figure 6 , which is the second embodiment of the present invention, and is based on the previous embodiment. This embodiment provides a temperature and humidity control method for electronic transformer testing, which is applicable to the control system described in implementation 1, and the method includes:

[0047] S1: Collecting temperature and humidity data in the environmental simulation box through the collection unit 100.

[0048] Specifically, the acquisition unit 100 includes a temperature and humidity sensor, which is arranged in the environmental simulation box. In this embodiment, a DH11 temperature and humidity sensor is used to measure the temperature and humidity in the environment in real time and output the data to the control unit in digital form. Figure 3 As shown, in the DH11 temperature and humidity sensor, pin 1 of the main board XH-3AW is electrically connected to the ground wire GND through capacitor C14, and pin 3 of the main board XH-3AW is electrically connected to the ground wire GND. A resistor R10 is electrically connected between pins 1 and 2 of the main board XH-3AW.

[0049] S2: The control unit 200 receives the data collected by the collection unit 100 and performs calculations and issues instructions according to the configured algorithm.

[0050] Specifically, the control unit 200 includes a single chip microcomputer 201, a memory 202 and a signal conversion module 203. In this embodiment, the single chip microcomputer 201 is a STM32F103C8T6, which is the core of the system and is responsible for data collection, processing and communication with external devices.

[0051] The memory 202 uses an AT24C02 data memory, which is connected to the single-chip computer 201 using an I2C bus, and is used to store important data or historical records for subsequent analysis and query. Pins 1, 2, 3, 4, and 7 of the data memory AT24C02 motherboard are electrically connected to the ground wire GND, and pins 5 and 6 of the data memory AT24C02 motherboard are electrically connected to the ground wire GND through resistors R19 and R20, and both ends of the capacitor C27 are electrically connected to the ground wire GND and pin 8 of the data memory AT24C02 motherboard, such as Figure 4 shown.

[0052] The signal conversion module 203 uses the SP3485EEN module, which is responsible for converting the UART serial port signal of the single-chip computer 201 into an RS-485 signal, so as to facilitate communication with a computer or other RS-485 devices. Pins 2 and 3 of the SP3485EEN mainboard are electrically connected, and a capacitor C18 is electrically connected to the 8-pin connection line of the SP3485EEN mainboard. The end of the capacitor C18 away from the 8-pin connection line of the SP3485EEN mainboard is electrically connected to the ground line GND. The 6-pin and 7-pin connection lines of the SP3485EEN mainboard are electrically connected to a resistor R22. The 6-pin and 7-pin connection lines of the SP3485EEN mainboard are electrically connected to resistors R24 and R23 respectively. The resistors R24 and R23 are electrically connected to VCC3V3 and the ground line GND respectively away from the 6-pin and 7-pin connection lines of the SP3485EEN mainboard. Figure 5 shown.

[0053] The control unit 200 is the core component of the system, responsible for receiving data from the temperature and humidity sensors, and performing calculations and controls according to preset temperature and humidity thresholds. The control unit 200 has a built-in control algorithm that can calculate the output of the execution unit 300 based on the difference between the real-time data and the preset threshold. The temperature output of the execution unit 300 is:

[0054]

[0055] in, Indicates the average value of the set temperature threshold, Kp indicates the proportional coefficient, and Tb indicates the current temperature;

[0056] The humidity output is:

[0057]

[0058] Among them, among them, It represents the average value of the set humidity threshold, KP represents the proportional coefficient, and TB represents the current temperature.

[0059] S3: The execution unit 300 changes the temperature and humidity data in the environmental simulation box according to the instruction.

[0060] Specifically, the execution unit 300 includes a heater, a refrigerator, a humidifier and a dehumidifier, which all use the same circuit, including a relay K5, a diode D5 is electrically connected between the 2nd and 3rd pins of the relay K5, and the 3rd pin of the relay K5 is electrically connected to the transistor Q5, such as Figure 6 The execution unit 300 changes the temperature and humidity environment in the environment simulation box in real time according to the instruction of the control unit 200.

[0061] Example 3

[0062] This is the third embodiment of the present invention, which is based on the previous embodiment. This embodiment provides a method for obtaining a proportional coefficient Kp and a proportional coefficient KP, the method comprising:

[0063] S1: Set the value of the initial proportional coefficient Kp.

[0064] S2: Apply the value of the initial proportional coefficient Kp to the control system and run the system, using a data acquisition system or manually recording the input, output (i.e., temperature value) and any relevant performance parameters (such as response time, overshoot, etc.).

[0065] S3: Evaluate the system's response to input changes, i.e. observe how the output temperature St changes over time and compare it with the expected response.

[0066] If the system responds too quickly (i.e., overshoots or oscillates), the value of the proportionality factor Kp may be too large.

[0067] If the system responds too slowly, it indicates that the value of the proportional coefficient Kp may be too small.

[0068] When the proportional coefficient Kp is selected appropriately, the system can respond quickly and correct the deviation, thereby keeping the output close to the set value and improving the accuracy of the system.

[0069] If the proportional coefficient Kp is set too large, the system may overshoot or oscillate, causing the output value to fluctuate around the set value, thereby reducing the accuracy of the system. This is because the system is too sensitive to the error and amplifies the error signal.

[0070] On the other hand, if the proportional coefficient Kp is set too small, the system's response to the error will become slow, the adjustment time will increase, and the system may not be able to completely eliminate the error, which will also reduce the accuracy of the system.

[0071] S4: According to the analysis results of the system response, adjust the value of the proportional coefficient Kp.

[0072] If the system responds too quickly, reduce the value of the proportional coefficient Kp; if the system responds too slowly, increase the value of the proportional coefficient Kp.

[0073] The method for obtaining the proportional coefficient KP is the same as the method for obtaining the proportional coefficient Kp.

[0074] In summary, the beneficial effects of the present invention are:

[0075] The present invention can calculate the precise temperature control output through the output formula according to the deviation between the current temperature and the set temperature and humidity threshold average value through the proportional coefficient. The proportional coefficient can be adjusted according to the specific needs of the system to achieve more precise temperature control. Through the adjusted value, the system can respond to temperature deviations more quickly and reduce steady-state errors, thereby achieving precise control of the temperature and humidity in the environmental simulation box, providing a more reliable and accurate temperature and humidity environment for the testing of electronic transformers.

[0076] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A temperature and humidity control system for testing an electronic transformer, characterized in that: include, A collection unit (100), comprising a temperature and humidity sensor, which is arranged in the environmental simulation box and is used to collect temperature and humidity data in the environmental simulation box; A control unit (200) is used to receive the data collected by the collection unit (100) and perform data processing; The execution unit (300) changes the temperature and humidity data in the environmental simulation box according to the instruction of the control unit (200).

2. The temperature and humidity control system for testing an electronic transformer as claimed in claim 1, characterized in that: The control unit (200) is configured with a control algorithm, which controls the temperature and humidity output of the execution unit (300), wherein the temperature output is: in, Indicates the average value of the set temperature threshold, Kp indicates the proportional coefficient, and Tb indicates the current temperature; The humidity output is: Among them, among them, It represents the average value of the set humidity threshold, KP represents the proportional coefficient, and TB represents the current temperature.

3. The temperature and humidity control system for testing an electronic transformer as claimed in claim 2, characterized in that: The execution unit (300) includes a heater, a refrigerator, a humidifier and a dehumidifier.

4. The temperature and humidity control system for testing an electronic transformer as claimed in claim 3, characterized in that: The control unit (200) comprises a single chip computer (201), a memory (202) and a signal conversion module (203).

5. A temperature and humidity control method for testing an electronic transformer, characterized in that: include, Collecting temperature and humidity data in the environmental simulation box through a collection unit (100); The control unit (200) receives the data collected by the collection unit (100), performs calculations according to a configured algorithm, and issues instructions; The execution unit (300) changes the temperature and humidity data in the environmental simulation box according to the instruction.

6. The temperature and humidity control method for testing an electronic transformer as claimed in claim 5, characterized in that: The acquisition unit (100) comprises a temperature and humidity sensor, and the execution unit (300) comprises a heater, a refrigerator, a humidifier and a dehumidifier.

7. The temperature and humidity control method for testing an electronic transformer as claimed in claim 6, characterized in that: The control unit (200) comprises a single chip microcomputer (201), a memory (202) and a signal conversion module (203), wherein the single chip microcomputer (201) is configured with a control algorithm, and the control algorithm controls the temperature and humidity output of the execution unit (300), wherein the temperature output is: in, Indicates the average value of the set temperature threshold, Kp indicates the proportional coefficient, and Tb indicates the current temperature; The humidity output is: Among them, among them, It represents the average value of the set humidity threshold, KP represents the proportional coefficient, and TB represents the current temperature.

8. The temperature and humidity control method for testing an electronic transformer as claimed in claim 7, characterized in that: The method for obtaining the proportional coefficient Kp includes: Setting the initial value of the proportional coefficient Kp; Substitute the initial value of the proportional coefficient Kp into the system for operation and record the relevant parameters; Observe the response of the system to the input change. If the system responds too quickly, it indicates that the value of the proportional coefficient Kp is too large and needs to be reduced. If the system responds too quickly, it indicates that the value of the proportional coefficient Kp is too small and needs to be increased. The method for obtaining the proportional coefficient KP is the same as that for the proportional coefficient Kp.

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