Frequency converter deceleration overvoltage fault testing device

Abstract

The utility model discloses a frequency converter deceleration overvoltage fault testing device comprising an adjusting mechanism. The adjusting mechanism comprises a vertical linear degree of freedom, and the linear degree of freedom is used for performing lifting adjustment on the mutual inductor array; the mutual inductor array is composed of a plurality of mutual inductors arranged in an array, and the lowest secondary voltage and the highest secondary voltage of each mutual inductor are different from each other; because the power is a fixed value and the product of the voltage and the current is equal to the power, when the voltage of the tested piece is lower than the rated power supply voltage, the current is increased, and the frequency converter starts protection; according to the utility model, the detection post is arranged on the production line, so that the automatic or semi-automatic detection process is realized. The efficiency of a production line is improved, the requirement for manual operation is reduced, and therefore the labor cost is reduced. By using the mutual inductor array, a plurality of mutual inductors are arranged in a rectangular array mode, and a wide test range is covered.

Description

Technical Field

[0001] The utility model relates to the technical field of frequency converters, in particular to a frequency converter deceleration overvoltage fault testing device. Background Art

[0002] A frequency converter (VFD), also known as an AC inverter or variable frequency speed regulator, is a common power electronic device used to adjust the speed and operating frequency of a motor. It typically converts AC power (such as three-phase AC) into adjustable AC power to control the speed and torque of the motor. VFDs are widely used in industrial and commercial applications to achieve functions such as motor speed regulation, energy conservation, precise control, and adaptive operation. They are crucial for improving production efficiency and reducing energy consumption.

[0003] A "deceleration overvoltage fault" occurs when the voltage exceeds the safe range during the motor's deceleration process under inverter control. Because this typically occurs during motor braking or deceleration, it is referred to as a "deceleration overvoltage fault." In this case, the motor may generate back electromotive force, causing the voltage to rise. A deceleration overvoltage fault can damage both the motor and the inverter itself, requiring protection and handling.

[0004] Frequency converters typically have built-in protection mechanisms to address overvoltage faults during deceleration. The most common is a built-in braking resistor to absorb excess energy and prevent voltage rise. Some intelligent frequency converters also use algorithms to detect and adjust parameters such as output frequency, current, and braking torque in real time, thereby reducing voltage rise during deceleration.

[0005] Although VFDs have built-in protection against deceleration overvoltage faults, this protection can fail in modern VFD assembly lines. Incorrect parameter settings, over-tuning, or configuration errors can cause the protection mechanism to not function as expected. Harsh operating environments, electromagnetic interference, or overload conditions can also cause the protection mechanism to fail.

[0006] Existing technologies typically require proper maintenance, high-quality equipment, and environmental monitoring. Operators should also regularly check the inverter's performance and perform maintenance and calibration as necessary to ensure reliability and safety. However, this traditional solution remains a passive preventative measure, lacking effective testing methods to verify the effectiveness of the inverter's built-in safeguards. Consequently, there's still a chance that defective products will enter the market.

[0007] Therefore, a frequency converter deceleration overvoltage fault test device is proposed. Utility Model Content

[0008] In view of this, the embodiments of the present invention hope to provide a frequency converter deceleration overvoltage fault testing device to solve or alleviate the technical problems existing in the prior art, namely, during the production of the frequency converter, the deceleration overvoltage mechanism of the frequency converter may fail due to improper installation, welding problems, connection problems or other assembly errors, thereby causing an overcurrent fault during the deceleration process; by setting up a testing station in the production assembly line of the frequency converter and performing corresponding testing operations, it is ensured that the quality of each frequency converter meets the specifications when it comes off the line, and at least a useful option is provided;

[0009] The technical solution of the embodiment of the utility model is implemented as follows: a frequency converter deceleration overvoltage fault test device includes an adjustment mechanism; the adjustment mechanism includes a vertical linear degree of freedom, and the linear degree of freedom is adjusted to perform lifting and lowering adjustment on the transformer array; the transformer array is composed of a plurality of transformers arranged in an array, and the minimum secondary voltage and the maximum secondary voltage of each transformer are different from each other; because power is a constant value, and voltage multiplied by current equals power, when the voltage of the tested device is lower than the rated supply voltage, the current increases, and the frequency converter should start protection; if the supply voltage is greater than the supply voltage standard, the frequency converter should also start protection; based on this mechanism, it is judged whether the test mechanism of the frequency converter deceleration overvoltage is normal; when the transformer array is raised and lowered, its electrode end is inserted into a number of tested frequency converters for testing.

[0010] In the above-mentioned embodiment, the device includes an adjustment mechanism, which has a vertical linear degree of freedom and allows for vertical lifting and lowering adjustment. The transformer array is composed of a plurality of transformers arranged in an array, and the minimum secondary voltage and the maximum secondary voltage of each transformer are different. The test mechanism is based on the principle of conservation of power, that is, the power is a constant. When the voltage of the tested device is lower than the rated supply voltage, the current will increase and the inverter should start protection; if the supply voltage is greater than the supply voltage standard, the inverter should also start protection. When the transformer array is raised and lowered, its electrode end is plugged into multiple inverters that need to be tested.

[0011] In one embodiment, the device further comprises an assembly line, wherein the regulating mechanism is arranged on the assembly line, and the assembly line is connected to the transport line of the front and rear inverter production lines to form a process station for detection.

[0012] In the above-described embodiment, the assembly line is placed on the inverter production line and connected to the transport lines of the preceding and succeeding inverter production lines. It serves as a testing process station. The assembly line sequentially and intermittently transports the inverters to their corresponding transformers in the transformer array, enabling each transformer to test a single inverter. Because the minimum and maximum secondary voltages of each transformer vary, multiple testing modes are possible. Each transformer can detect voltages within a different range.

[0013] In one embodiment, the adjustment mechanism includes a fixed first frame, the first frame is vertically slidably matched with a second frame, and the transformer array is mounted on the second frame.

[0014] In the above-mentioned embodiment, this structural design allows for flexible raising and lowering of the transformer array, ensuring that the transformers can be accurately connected to the inverter under test, thereby improving the adaptability and accuracy of the device. This helps ensure that each inverter can receive accurate deceleration overvoltage fault testing.

[0015] In one embodiment, the adjustment mechanism includes a linear actuator for outputting the linear degree of freedom, the linear actuator is fixed on the first frame, and the linear actuator is used to drive the second frame to slide vertically along the first frame.

[0016] In the above-mentioned embodiment, the use of linear actuators enables the adjustment mechanism to precisely raise and lower the transformer array, ensuring connection to inverters at varying heights. This improves the adaptability and control accuracy of the device. This is crucial for accurately detecting deceleration overvoltage faults.

[0017] In one embodiment, the linear actuator is a servo electric cylinder, and the cylinder body and piston rod of the servo electric cylinder are fixed on the first frame and the second frame respectively.

[0018] In the above-mentioned embodiment, the use of servo electric cylinders provides a high degree of control precision to ensure the accurate raising and lowering of the transformer array. This is crucial for detecting inverter deceleration overvoltage faults because it ensures the accuracy and repeatability of the test.

[0019] In one embodiment, the mutual inductor array includes a frame on which at least three mutual inductors are mounted in a rectangular array. The mutual inductors are preferably AC mutual inductors.

[0020] In the above embodiment, the mutual inductor array includes a frame designed to have a rectangular array form, in which at least three mutual inductors are installed.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] 1. Automation or Semi-automation and Efficiency: This utility model implements an automated or semi-automated testing process by incorporating testing stations into the production line. This improves production line efficiency, reduces the need for manual operation, and thus lowers labor costs. By utilizing a transformer array, multiple transformers are arranged in a rectangular array, covering a wide testing range. This ensures comprehensive testing of inverters of varying models and specifications, reducing the risk of missed tests.

[0023] Second, precise measurement: This utility model utilizes AC transformers, specifically designed to measure voltage and current in AC circuits. These sensors provide highly accurate measurements, ensuring test accuracy. By monitoring the voltage and current of the inverter, problems can be identified and addressed in real time on the production line. This helps ensure that every inverter that rolls off the production line meets specifications, reducing product failure rates.

[0024] III. Adaptability: The adjustable voltage transformer array and multiple detection modes of this utility model increase the device's flexibility, making it adaptable to different inverter models and specifications. The automated or semi-automated, efficient detection process helps reduce scrap and improve production line efficiency, thereby lowering production costs. The detection mechanism, based on the principle of power conservation, can immediately trigger the inverter's protection mechanism when a problem is detected. Consequently, defective inverters are immediately destroyed automatically or semi-automatically due to this testing mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0026] Figure 1 It is a three-dimensional schematic diagram of the utility model;

[0027] Figure 2 This is a three-dimensional schematic diagram of the adjustment mechanism of the utility model;

[0028] Figure 3 This is a three-dimensional schematic diagram of a mutual inductor array of the present utility model;

[0029] Reference numerals: 1, assembly line; 2, regulating mechanism; 201, first rack; 202, linear actuator; 203, second rack; 3, mutual inductor array; 4, electrode end; DETAILED DESCRIPTION

[0030] To make the above-mentioned objects, features, and advantages of the present invention more clearly understood, the following detailed description of the specific embodiments of the present invention is provided in conjunction with the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0031] In this specific implementation, it is first necessary to clarify the definitions of some nouns:

[0032] A transformer consists of a primary side and a secondary side. The primary side is connected to the voltage source in the power system, while the secondary side is connected to the measuring device.

[0033] Secondary Voltage of a Transformer: This is the voltage output on the secondary side, usually measured in volts (V). It is the voltage signal measured by the transformer.

[0034] Secondary Current of a Current Transformer: This is the current output on the secondary side, usually measured in amperes (A). For a current transformer, this is the current signal measured by the transformer.

[0035] Rated Secondary Voltage of a Transformer: This is the rated voltage value of the secondary side of the transformer. The secondary voltage of a transformer is usually designed to be a fixed value to ensure that the transformer can provide an accurate output during normal operation.

[0036] Rated Secondary Current of a Current Transformer: For a current transformer, this is the rated current value of the transformer's secondary side. It indicates the maximum current the transformer can measure.

[0037] Example

[0038] See also Figure 1-3This specific embodiment will provide a frequency converter deceleration overvoltage fault test device, including an adjustment mechanism 2; the adjustment mechanism 2 includes a vertical linear degree of freedom, and the linear degree of freedom is adjusted to the transformer array 3 for lifting and lowering adjustment; the transformer array 3 is composed of a plurality of transformers arranged in an array, and the minimum secondary voltage and the maximum secondary voltage of each transformer are different; because power is a constant value, and voltage multiplied by current equals power, when the voltage of the tested device is lower than the rated supply voltage, the current increases, and the frequency converter should start protection; if the supply voltage is greater than the supply voltage standard (i.e., the national standard), the frequency converter should also start protection; based on this mechanism, it is judged whether the test mechanism of the frequency converter deceleration overvoltage is normal; when the transformer array 3 is raised and lowered, its electrode end 4 is inserted into a number of tested frequency converters for testing.

[0039] In this solution: the device includes an adjustment mechanism 2, which has vertical linear freedom and allows for vertical lifting and lowering adjustments. The transformer array 3 is composed of multiple transformers arranged in an array, and the minimum secondary voltage and maximum secondary voltage of each transformer are different. The test mechanism is based on the principle of conservation of power, that is, power is a constant. When the voltage of the tested device is lower than the rated supply voltage, the current will increase and the inverter should start protection; if the supply voltage is greater than the supply voltage standard, the inverter should also start protection. When the transformer array 3 is raised and lowered, its electrode end 4 is plugged into multiple inverters that need to be tested.

[0040] Specifically: This adjustment mechanism 2 is used to accurately adjust the position of the transformer array 3 to ensure that the transformer is correctly connected and adjusted to the inverter under test. Through the vertical linear degree of freedom, the adaptability of the transformer to different inverters can be achieved. The transformer array 3 is used to measure voltage and current to detect the operating status of the inverter. The secondary voltage range of different transformers can adapt to the voltage output of different inverters. The test mechanism detects the voltage and current of the inverter under test and determines whether a deceleration overvoltage occurs based on the principle of power conservation. When the voltage is lower than the standard or the current increases abnormally, the mechanism triggers the protection mechanism of the inverter. By plugging the transformer array 3 into the circuit of the inverter under test, it can measure voltage and current for testing.

[0041] In this solution, all electrical components of the device as a whole rely on AC power for energy supply; specifically, the electrical components of the device as a whole are conventionally electrically connected to the AC power output port through devices such as relays, transformers and button panels to meet the energy supply requirements of all electrical components of the device.

[0042] Specifically, a controller is also provided on the outside of the device, which is used to connect and control all electrical components of the device as a whole to be driven according to a pre-set program as a preset value and drive mode; it should be pointed out that the above-mentioned drive mode corresponds to the corresponding start-stop time interval, speed, power and other output parameters between the relevant electrical components below, that is, it meets the requirements of the relevant electrical components described below to drive the relevant mechanical devices to operate according to the functions described therein.

[0043] It can be understood that in this specific embodiment: the function of this adjustment mechanism 2 is to ensure that the mutual inductor can be accurately connected to the frequency converter for testing. Through lifting and lowering adjustment, it can adapt to the position and height of different frequency converters to ensure the accuracy and reliability of the test. The role of the mutual inductor array 3 is to measure voltage and current in order to determine the operating status of the frequency converter. Transformers with different secondary voltage ranges can be applied to tests under different voltage conditions to ensure the coverage of the test. The function of the test mechanism is to detect the voltage and current conditions of the frequency converter to determine whether there is a deceleration overvoltage fault. It ensures the normal operation of the frequency converter and triggers protection measures to avoid potential damage or failure.

[0044] It will be appreciated that in this embodiment, the device is designed to measure voltage and current to detect the inverter's operating status, specifically whether overvoltage conditions exist during deceleration. The coordinated efforts of the regulating mechanism 2, the transformer array 3, and the testing mechanism ensure accurate and reliable testing, thereby protecting the inverter from deceleration overvoltage faults.

[0045] In some specific embodiments of this application, please refer to Figures 2-3 : It also includes an assembly line 1, and an adjustment mechanism 2 is arranged on the assembly line 1. The assembly line 1 is connected to the transportation line of the front and rear inverter production lines and becomes a process station for detection.

[0046] During operation, assembly line 1 intermittently transports the inverters to corresponding transformers in transformer array 3, repeating this cycle. Each transformer then tests a specific inverter. Because the minimum and maximum secondary voltages of each transformer vary, multiple testing modes are possible.

[0047] In this solution, assembly line 1 is placed on the inverter production line and connected to the transport lines of the preceding and following inverter production lines. It serves as a testing process station. Assembly line 1 sequentially and intermittently transports inverters to corresponding transformers in transformer array 3, enabling each transformer to test a single inverter. Because the minimum and maximum secondary voltages of each transformer vary, multiple testing modes are possible. Each transformer can detect voltages within a different range.

[0048] Preferably, when in use, the staff needs to manually power on the frequency converter to undergo testing.

[0049] Further, in this specific embodiment, the principle of the transformer: A transformer is a sensor used to measure current and voltage in a circuit. They operate based on the principle of electromagnetic induction. When current flows through one side of the transformer (the primary side), it generates a magnetic field in the transformer's coil. This magnetic field induces a potential difference, or voltage, on the other side of the transformer (the secondary side). Therefore, the transformer converts the current into a voltage signal, allowing personnel to measure the magnitude of the current.

[0050] Furthermore, each mutual inductor needs to be electrically connected to a multimeter to provide feedback of current and voltage information.

[0051] Furthermore, in this embodiment, the power conservation principle is a fundamental principle of power systems. According to this principle, power equals voltage multiplied by current, i.e., P = VI, where P represents power, V represents voltage, and I represents current. If the voltage decreases, the current increases to maintain a constant power. This is because power is conserved in a circuit and cannot be destroyed.

[0052] Furthermore, in this specific embodiment, electrical relationships are established by measuring the inverter's current and voltage using a transformer. When the inverter is operating, it generates voltage and current signals. The transformer transmits these signals to a detection system for measurement and analysis. If the inverter's voltage drops below the specified level or its current increases abnormally, the principle of power conservation triggers the inverter's protection mechanism to prevent potential overvoltage or circuit failure.

[0053] Specifically, assembly line 1 transports the VFDs from the forward and backward production lines to the testing station for individual testing. This cyclic testing method ensures that each VFD passes through transformer array 3 in turn to detect deceleration overvoltage faults. Different transformer voltage ranges are suitable for different VFD types, allowing multiple testing ranges to be performed on the same device.

[0054] It will be appreciated that in this embodiment, the assembly line 1 provides automated transport and positioning capabilities, positioning each inverter at a specific location within the transformer array 3 so that it can be individually tested, thereby improving the efficiency and consistency of the production line. In this way, each inverter undergoes the same testing process, ensuring that each inverter is fully tested to detect deceleration overvoltage faults. This implementation of multiple testing modes increases the flexibility of the device, making it applicable to inverters of different models and specifications, and improving its versatility and adaptability.

[0055] It can be understood that in this specific embodiment, by combining elements such as the assembly line 1, cyclic detection, and multiple detection modes, this embodiment can efficiently detect deceleration overvoltage faults in each inverter on the production line, ensuring product quality and consistency. Furthermore, it can accommodate inverters with various voltage ranges, increasing the flexibility of the device.

[0056] In some specific embodiments of this application, please refer to Figures 2-3 The regulating mechanism 2 includes a fixed first frame 201, the first frame 201 is vertically slidably matched with a second frame 203, and the second frame 203 is equipped with a mutual inductor array 3.

[0057] In this solution, the structural design allows for flexible raising and lowering of the transformer array 3, ensuring accurate connection of the transformers to the tested inverters, improving the adaptability and accuracy of the device. This helps ensure that each inverter can be accurately tested for deceleration overvoltage faults.

[0058] Specifically, the first rack 201 provides fixing and supporting functions, and the second rack 203 can slide in the vertical direction to achieve the lifting and lowering adjustment of the mutual inductor array 3. This structure allows the vertical position of the mutual inductor array 3 to be adjusted as needed.

[0059] It can be understood that in this specific embodiment: through this structure, the position of the mutual inductor array 3 can be adjusted by sliding the second rack 203 without changing the position of the first rack 201 to adapt to the height and position of different inverters.

[0060] In some specific embodiments of this application, please refer to Figures 2-3 : The adjustment mechanism 2 includes a linear actuator 202 for outputting linear degrees of freedom. The linear actuator 202 is fixed on the first frame 201 and is used to drive the second frame 203 to slide vertically along the first frame 201 for adjustment.

[0061] In this embodiment, the use of linear actuators 202 enables adjustment mechanism 2 to precisely raise and lower transformer array 3, ensuring connection to inverters at varying heights. This improves the adaptability and control accuracy of the device. This is crucial for accurately detecting deceleration overvoltage faults.

[0062] Specifically, the linear actuator 202 provides linear motion in an electric, hydraulic or pneumatic manner, so that the second rack 203 can slide vertically along the first rack 201 , thereby achieving the lifting and lowering adjustment of the mutual inductor array 3 .

[0063] It should be pointed out that, based on the above mechanism, the assembly line 1 needs to be programmed and adjusted accordingly to ensure that each inverter can accurately correspond to the electrode end 4 during its intermittent transportation; or a staff member can be arranged to manually connect to the electrode end 4.

[0064] It will be appreciated that in this embodiment, the linear actuator 202 functions to precisely adjust the transformer array 3 to a position appropriate for the inverter being tested by controlling its lifting motion. This provides precise linear degree of freedom control to ensure test accuracy and repeatability.

[0065] In some specific embodiments of this application, please refer to Figures 2-3 : The linear actuator 202 is a servo electric cylinder, and the cylinder body and piston rod of the servo electric cylinder are fixed on the first frame 201 and the second frame 203 respectively.

[0066] In this solution, a servo electric cylinder is used to provide a high degree of control accuracy to ensure accurate lifting and lowering of the transformer array 3. This is crucial for detecting inverter deceleration overvoltage faults because it ensures the accuracy and repeatability of the test.

[0067] Specifically, the servo electric cylinder includes a cylinder body and a piston rod, wherein the cylinder body is fixed to the first frame 201, and the piston rod is fixed to the second frame 203. By controlling the movement of the servo electric cylinder, the second frame 203 can be accurately slid vertically to adjust the height of the mutual inductor array 3.

[0068] It is understandable that in this specific embodiment, the function of the servo electric cylinder is to provide high-precision linear motion control so that the second rack 203 can be accurately raised and lowered to ensure that the mutual inductor can be connected to the inverter under test and maintain the required test position.

[0069] In some specific embodiments of this application, please refer to Figures 2-3 The mutual inductor array 3 comprises a frame on which at least three mutual inductors are mounted in a rectangular array. The mutual inductors are preferably AC mutual inductors.

[0070] In this solution, the mutual inductor array 3 includes a frame designed to have a rectangular array form, in which at least three mutual inductors are installed.

[0071] Specifically: The rack is designed with multiple mounting locations to accommodate at least three instrument transformers. These transformers are installed in various locations to form a rectangular array to cover a wide range of test conditions. AC instrument transformers are sensors specifically designed to measure voltage and current in AC circuits. They accurately measure the parameters of AC signals.

[0072] It will be appreciated that in this embodiment, the structure of the transformer array 3 and the layout of the multiple transformers ensure comprehensive testing and coverage. It can simultaneously measure voltage and current at multiple points to detect deceleration overvoltage faults. AC transformers are selected to ensure accurate measurement of the tested inverter, as inverters typically use AC power. This type of transformer is very effective in measuring and detecting deceleration overvoltage faults.

[0073] In summary, in response to the related problems in the conventional technology, this specific embodiment, based on the above-mentioned inverter deceleration overvoltage fault test device, adopts the following technical means or features to achieve a solution:

[0074] (1) Assembly Line 1 and Inspection Station Setup: On the inverter assembly line, assembly line 1 (or production line) is first set up, connecting the inverter production lines before and after. This assembly line 1 is equipped with an inspection station, or testing station. Each inverter passes through this inspection station in turn.

[0075] (2) Detection mechanism: In the detection station, a transformer array 3 is used, which includes multiple transformers, preferably AC transformers. These transformers are arranged in a rectangular array, and the minimum secondary voltage and the maximum secondary voltage of each transformer are different from each other to achieve multiple detection modes. The servo cylinder or linear actuator 202 is used to adjust the position of the transformer array 3. This ensures that the transformer can be accurately connected to the tested inverters at different heights. The assembly line 1 sends each inverter to the corresponding position of the transformer array 3 in turn to test the deceleration overvoltage fault.

[0076] (3) Voltage and current detection: The transformer array 3 measures the voltage and current of each inverter to detect the operating status of the inverter, especially whether there is an overvoltage during the deceleration process.

[0077] (4) Test results and quality control: The detection mechanism is based on the principle of power conservation. If the voltage is detected to be below the standard or the current is abnormally increased, the detection mechanism will trigger the inverter's protective measures to avoid potential damage or failure. If the inverter passes the test, it will be considered to meet the quality specifications and can continue the production process. If problems are detected, further repairs or adjustments may be required to ensure its quality.

[0078] This technology ensures that every VFD undergoes appropriate testing to detect deceleration overvoltage faults. By establishing testing stations, utilizing tools such as transformer arrays, servo cylinders, and a robust current and voltage detection mechanism, VFD quality is assured throughout the production assembly line. This ensures that every VFD that rolls off the assembly line meets specifications, reducing product failure rates and improving product quality.

[0079] The above-described embodiments merely represent implementation methods for the relevant practical applications of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that a person of ordinary skill in the art would be able to make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present utility model patent shall be determined by the appended claims.

Claims

1. A frequency converter deceleration overvoltage fault test device, characterized by: including an adjusting mechanism (2); The regulating mechanism (2) includes a vertical linear degree of freedom, and the linear degree of freedom is adjusted to perform lifting and lowering regulation on the mutual inductor array (3); The mutual inductor array (3) is composed of a plurality of mutual inductors arranged in an array, and the lowest secondary voltage and the highest secondary voltage of each mutual inductor are different from each other; When the mutual inductor array (3) is raised or lowered, its electrode end (4) is plugged into a plurality of frequency converters to be tested for testing.

2. The inverter deceleration overvoltage fault testing device according to claim 1, characterized in that: It also includes an assembly line (1), the regulating mechanism (2) is arranged on the assembly line (1), and the assembly line (1) is connected to the transport line of the front and rear frequency converter production lines to form a detection process station for implementation.

3. The inverter deceleration overvoltage fault testing device according to claim 1, characterized in that: The regulating mechanism (2) comprises a fixed first frame (201), the first frame (201) vertically slidingly cooperates with a second frame (203), and the second frame (203) carries the mutual inductor array (3).

4. The inverter deceleration overvoltage fault testing device according to claim 3, characterized in that: The adjustment mechanism (2) comprises a linear actuator (202) for outputting the linear degree of freedom, wherein the linear actuator (202) is fixed on the first frame (201) and is used to drive the second frame (203) to perform vertical sliding adjustment along the first frame (201).

5. The inverter deceleration overvoltage fault testing device according to claim 4, characterized in that: The linear actuator (202) is a servo electric cylinder, and the cylinder body and piston rod of the servo electric cylinder are respectively fixed on the first frame (201) and the second frame (203).

6. The inverter deceleration overvoltage fault testing device according to any one of claims 1 to 5, characterized in that: The mutual inductor array (3) comprises a frame on which at least three mutual inductors are mounted in the form of a rectangular array.

7. The inverter deceleration overvoltage fault testing device according to any one of claims 1 to 5, characterized in that: The mutual inductor is an AC mutual inductor.

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