Automatic Test Device and Method for Voltage Tolerance Curve of AC Contactor

Abstract

The present invention discloses an automatic test device for the voltage tolerance curve of an AC contactor, which includes: a rectification module for rectifying single-phase alternating current into direct current; an energy storage module for storing the direct current output by the rectification module; an inverter connected between the energy storage module and the electromagnetic coil of the AC contactor; a current-limiting resistor forming a series circuit with the main contact of the AC contactor and the output end of the energy storage module; a current sensor for detecting the current signal of the main contact of the AC contactor; and a DSP module for switching the voltage control signal for controlling the output of the inverter according to the current signal detected by the current sensor according to a sequence table, and the sequence table includes multiple voltage sag parameter cycles. The present invention also discloses an automatic test method for the voltage tolerance curve of an AC contactor. The present invention can realize the automatic test of the voltage tolerance curve of the AC contactor, reduce the workload of the test personnel, and improve the test efficiency and accuracy.

Description

Technical Field

[0001] The present invention relates to the technical field of voltage sag in power quality, and particularly relates to an automatic test device and method for the voltage tolerance curve of an AC contactor. Background Art

[0002] A contactor is an automatic switching electrical appliance used to frequently connect and disconnect circuits. It has a remote control function that cannot be achieved by manual switching electrical appliances, and also has functions of undervoltage and no-voltage protection. The main control object of the contactor is the motor. According to the working principle, it can be divided into electromagnetic type, pneumatic type and hydraulic type. According to the type of power supply of the main control circuit, it can be divided into AC contactors and DC contactors. Currently, the most widely used is the electromagnetic AC contactor, and its structure mainly includes: an electromagnetic mechanism, a contact system, an arc extinguishing system and other components.

[0003] At present, voltage sag has been recognized as one of the most important power quality problems, seriously affecting the safety and normal operation of many electrical equipment. The so-called voltage sag is a phenomenon that the effective value of the supply voltage suddenly drops and then rises back to near the normal value within a short time. This phenomenon often lasts for 0.5 - 30 cycles in the power system.

[0004] When a power fluctuation fault occurs in the circuit, the AC contactor may be frequently connected or disconnected due to the unstable voltage, which will have a great impact on the circuit. According to the national standard regulations, the operating mechanism of the AC contactor should be reliably attracted at 85% of the rated voltage. Generally, in order to ensure the reliable operation of the contactor under low voltage in factories, the minimum attracting voltage of the electromagnetic mechanism is designed at 70% - 75% of the rated voltage; the operating mechanism of the AC contactor should be reliably disconnected when the voltage is below the minimum attracting voltage (20% - 70%).

[0005] Currently, the method of using the voltage tolerance curve (Voltage Tolerance Curve, VTC) is generally used to describe the voltage sag tolerance ability of AC contactors, and manual repetition tests need to be carried out using a voltage sag generator. When drawing the voltage tolerance curve, due to numerous influencing factors, when testing a single AC contactor, manual repetition of setting the voltage sag generator for voltage sag tolerance experiments is required, and the test efficiency is very low, and a large amount of labor costs are consumed.

[0006] The information disclosed in this background art section is only intended to enhance the overall understanding of the present invention and should not be regarded as an admission or any form of suggestion that this information constitutes prior art already known to those of ordinary skill in the art. Summary of the Invention

[0007] One of the objectives of the present invention is to provide an automatic test device and method for the voltage tolerance curve of an AC contactor, so as to improve the problems of low test efficiency and high labor cost in the prior art for testing the voltage tolerance curve of an AC contactor.

[0008] Another objective of the present invention is to provide an automatic test device and method for the voltage tolerance curve of an AC contactor, so as to improve the test accuracy and provide more comprehensive and practical data support for the application of the AC contactor.

[0009] To achieve the above objectives, according to the first aspect of the present invention, an automatic test device for the voltage tolerance curve of an AC contactor is provided, which includes: a rectification module for rectifying single-phase alternating current into direct current; an energy storage module for storing the direct current output by the rectification module; an inverter connected between the energy storage module and the electromagnetic coil of the AC contactor; a current-limiting resistor forming a series circuit with the main contact of the AC contactor and the output terminal of the energy storage module; a current sensor for detecting the current signal of the main contact of the AC contactor; and a DSP module for switching the voltage control signal for controlling the output of the inverter according to the current signal detected by the current sensor, and the sequence list includes multiple voltage sag parameter cycles.

[0010] Further, in the above technical solution, the current signal is a current mutation signal.

[0011] Further, in the above technical solution, the automatic test device for the voltage tolerance curve of the AC contactor further includes: a plurality of connection terminals, and the AC contactor is detachably connected through the plurality of connection terminals.

[0012] Further, in the above technical solution, the electromagnetic coil is connected to the inverter through a connection terminal; the main contact is connected to the output terminal of the energy storage module through a connection terminal.

[0013] Further, in the above technical solution, the multiple voltage sag parameter cycles include a voltage sag duration cycle and a voltage sag amplitude cycle.

[0014] Further, in the above technical solution, the multiple voltage sag parameter cycles further include one or more of a phase jump cycle, a voltage sag starting angle cycle, and a voltage harmonic distortion rate cycle.

[0015] Further, in the above technical solution, the automatic test device for the voltage tolerance curve of the AC contactor further includes: a human-machine interaction module communicatively connected to the DSP module.

[0016] Further, in the above technical solution, the current-limiting resistor is a variable resistor, and the resistance value of the current-limiting resistor is adjusted by the DSP module.

[0017] According to the second aspect of the present invention, the present invention provides an automatic test method for the voltage tolerance curve of an AC contactor, which at least includes the following steps:

[0018] S10 Preset a sequence list, the sequence list includes multiple voltage sag parameter cycles and corresponding step sizes, and the multiple voltage sag parameter cycles at least include a voltage sag duration cycle and a voltage sag amplitude cycle;

[0019] S20 Generate a voltage control signal according to the sequence list and send a voltage sag waveform to the AC contactor;

[0020] S30 Determine whether there is a sudden change in the current of the AC contactor,

[0021] S31 If the judgment result is no, increase the voltage sag duration according to the preset step size and return to step S20;

[0022] S32 If the judgment result is yes, record the data and determine whether the voltage sag amplitude is the maximum value of the voltage sag amplitude cycle,

[0023] S321 If the judgment result is no, increase the voltage sag amplitude according to the preset step size and return to step S20;

[0024] S322 If the judgment result is yes, obtain the voltage tolerance curve of the AC contactor according to the recorded data;

[0025] S40 Determine whether other voltage sag parameter cycles in the sequence list have been completed,

[0026] S41 If the judgment result is no, change the voltage sag parameters according to the corresponding step size and return to step S20;

[0027] S42 If the judgment result is yes, end the test.

[0028] Further, in the above technical solution, the voltage sag duration cycle is 1 ms to 300 ms, and the step size is 1 ms or 5 ms; the voltage sag amplitude cycle is 0% to 100%, and the step size is 5%.

[0029] Further, in the above technical solution, the multiple voltage sag parameter cycles further include one or more of a phase jump cycle, a voltage sag starting angle cycle, and a voltage harmonic distortion rate cycle.

[0030] Further, in the above technical solution, the phase jump cycle is 0° to 360°, and the phase jump cycle at least includes 0° and 90°; the voltage sag starting angle cycle is 0° to 360°, and the voltage sag starting angle cycle at least includes 0° and 90°; the voltage harmonic distortion rate cycle is 0% to 100%.

[0031] Further, in the above technical solution, the starting angle cycle of the voltage sag is 0° to 90°.

[0032] Further, in the above technical solution, before step S20, there is also a step of setting a current-limiting resistor to prevent the AC contactor from short-circuiting.

[0033] Further, in the above technical solution, there is an interval time before changing the voltage control signal according to the sequence list, and the interval time is greater than 1 min.

[0034] Further, in the above technical solution, the abscissa of the voltage tolerance curve of the AC contactor is the duration of the voltage sag, and the ordinate is the amplitude of the voltage sag.

[0035] Further, in the above technical solution, the automatic test method for the voltage tolerance curve of the AC contactor uses the automatic test device for the voltage tolerance curve of the AC contactor according to any one of the above technical solutions.

[0036] Compared with the prior art, the present invention has one or more of the following beneficial effects:

[0037] 1. By detecting the current signal of the main contact of the AC contactor through a current sensor, it is possible to judge that the voltage sag triggers the action of the AC contactor. Combining with the DSP module, the automatic test of the voltage tolerance curve of the AC contactor can be cycled according to the voltage sag parameters in the preset sequence list. The present invention greatly reduces the workload of the test personnel and improves the test efficiency and accuracy.

[0038] 2. The present invention can comprehensively and automatically test various voltage sag parameters, thereby providing reliable data support for the performance analysis of the AC contactor under various factors and providing a powerful analysis tool for the overall optimal design of the anti-voltage-sag AC contactor.

[0039] 3. The present invention can realize the on-demand and free output of the voltage tolerance curve of the AC contactor, that is, select and output the voltage tolerance curve of the AC contactor under the target variable according to the demand.

[0040] 4. By connecting the AC contactor through the terminal block, the applicability of the present invention is improved, and it is convenient to connect and replace different AC contactors for testing.

[0041] The above description is only an overview of the technical solution of the present invention. In order to be able to more clearly understand the technical means of the present invention and implement it according to the content of the specification, and in order to make the above and other purposes, technical features, and advantages of the present invention more understandable, the following lists one or more preferred embodiments and details them in conjunction with the accompanying drawings as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1It is a schematic structural diagram of an automatic test device for the voltage tolerance curve of an AC contactor according to an embodiment of the present invention.

[0043] Figure 2 It is a flowchart of an automatic test method for the voltage tolerance curve of an AC contactor according to an embodiment of the present invention.

[0044] Figure 3 It is the voltage tolerance curve of an AC contactor obtained by using the automatic test device and method for the voltage tolerance curve of an AC contactor according to an embodiment of the present invention.

[0045] Main reference numerals description:

[0046] 10 - AC power grid, 21 - rectification module, 22 - energy storage module, 23 - inverter, 30 - DSP module, 41 - current limiting resistor, 42 - current sensor, 50 - AC contactor, 51 - main contact, 52 - auxiliary contact, 53 - electromagnetic coil, 60 - terminal block, 70 - human - machine interaction module. Detailed implementation manners

[0047] The following will describe in detail the specific implementation manners of the present invention in conjunction with the accompanying drawings. It should be understood that the protection scope of the present invention is not limited by the specific implementation manners.

[0048] Unless otherwise clearly stated, in the whole specification and claims, the term "comprising" or its variations such as "including" or "having" etc. will be understood to include the stated elements or components, without excluding other elements or other components.

[0049] In this article, for the convenience of description, spatial relative terms such as "below", "beneath", "under", "above", "over", "on" etc. can be used to describe the relationship between one element or feature and another element or feature in the drawings. It should be understood that the spatial relative terms are intended to include different directions of the object in use or operation except the directions shown in the drawings. For example, if the object in the drawing is flipped, the element described as "below" or "under" other elements or features will be oriented "above" the element or feature. Therefore, the exemplary term "below" can include both the lower and upper directions. The object can also have other orientations (rotated 90 degrees or other orientations) and the corresponding explanations should be made for the spatial relative terms used herein.

[0050] In this article, terms such as "first", "second" etc. are used to distinguish two different elements or parts, and are not used to limit a specific position or relative relationship. In other words, in some embodiments, the terms "first", "second" etc. can also be interchanged with each other.

[0051] As Figure 1As shown, the AC contactor 50 includes a main contact 51, an auxiliary contact 52, and an electromagnetic coil 53. The automatic test device for the voltage tolerance curve of the AC contactor according to the specific embodiment of the present invention includes a rectification module 21, an energy storage module 22, and an inverter 23 that generate a voltage sag signal. The rectification module 21 is used to rectify the single-phase alternating current of the AC power grid 10 into direct current. The energy storage module 22 stores the direct current output by the rectification module 21. The inverter 23 is connected between the energy storage module 22 and the electromagnetic coil 53 of the AC contactor 50. A current-limiting resistor 41 and a current sensor 42 are connected in series on the loop formed by the main contact 51 of the AC contactor 50 and the output terminal of the energy storage module 22. The current sensor 42 detects the current signal of the main contact 51 of the AC contactor 50 to determine whether the AC contactor 50 operates. The DSP module 30 presets a sequence list, and the sequence list includes multiple voltage sag parameter cycles. The DSP module 30 switches the voltage control signal for controlling the output of the inverter 23 according to the current signal detected by the current sensor 42, so that the inverter 23 generates a target voltage sag waveform and transmits it to the AC contactor 50.

[0052] Further, in one or more exemplary embodiments of the present invention, the current signal is a current mutation signal. The current sensor 42 detects the current mutation signal in the loop formed by the energy storage module 22, the current-limiting resistor 41, and the main contact 51 of the AC contactor 50 to determine the closed and open states of the AC contactor 50 under the voltage sag signal. Further, in one or more exemplary embodiments of the present invention, the current-limiting resistor 41 can be a variable resistor. Exemplarily, the resistance value range of the variable resistor is 10~300Ω, and the resistance value of the current-limiting resistor 41 can be adjusted by the DSP module 30 to ensure that there is no short-circuit phenomenon when the AC contactor 50 operates, and at the same time, it is necessary to ensure that the current sensor 42 can detect the current mutation signal caused by the operation of the AC contactor 50. It should be understood that the present invention is not limited thereto, and the resistance value and type of the current-limiting resistor can be selected according to actual needs.

[0053] Further, in one or more exemplary embodiments of the present invention, the automatic test device for the voltage tolerance curve of the AC contactor is also provided with a plurality of wiring terminals 60, and the AC contactor 50 can be detachably connected through the plurality of wiring terminals 60. Exemplarily, the electromagnetic coil 53 is connected to the inverter 23 through a group of wiring terminals 60; the main contact 51 is connected to the output terminal of the energy storage module 22 through a group of wiring terminals.

[0054] Further, in one or more exemplary embodiments of the present invention, the multiple voltage sag parameter cycles include a voltage sag duration cycle and a voltage sag magnitude cycle. Preferably but not restrictively, in one or more exemplary embodiments of the present invention, the multiple voltage sag parameter cycles further include one or more of a phase jump cycle, a voltage sag starting angle cycle, and a voltage harmonic distortion rate cycle.

[0055] Further, in one or more exemplary embodiments of the present invention, for the convenience of operation, control, and result acquisition, the automatic test device for the voltage tolerance curve of an AC contactor further includes a human-machine interaction module 70, which is communicatively connected to the DSP module 30. An operator can set the test process and sequence list through the human-machine interaction module 70 and can view the voltage tolerance curve of the AC contactor obtained from the test.

[0056] In one or more embodiments of the present invention, an automatic test method for the voltage tolerance curve of an AC contactor at least includes the following steps:

[0057] S10 Preset a sequence list, where the sequence list includes multiple voltage sag parameter cycles and corresponding step sizes, and the multiple voltage sag parameter cycles at least include a voltage sag duration cycle and a voltage sag magnitude cycle;

[0058] S20 Generate a voltage control signal according to the sequence list and send a voltage sag waveform to the AC contactor;

[0059] S30 Determine whether a current mutation occurs in the AC contactor,

[0060] S31 If the judgment result is no, increase the voltage sag duration according to the preset step size and return to step S20;

[0061] S32 If the judgment result is yes, record the data and determine whether the voltage sag magnitude is the maximum value of the voltage sag magnitude cycle,

[0062] S321 If the judgment result is no, increase the voltage sag magnitude according to the preset step size and return to step S20;

[0063] S322 If the judgment result is yes, obtain the voltage tolerance curve of the AC contactor according to the recorded data;

[0064] S40 Determine whether other voltage sag parameter cycles in the sequence list have been completed,

[0065] S41 If the judgment result is no, change the voltage sag parameters according to the corresponding step size and return to step S20;

[0066] S42 If the judgment result is yes, end the test.

[0067] Further, in one or more exemplary embodiments of the present invention, the voltage sag duration cycle is 1 ms to 300 ms, and the step size is 1 ms or 5 ms; the voltage sag magnitude cycle is 0% to 100%, and the step size can be 5%, that is, the voltage sag magnitudes are 0%, 5%, 10%, 15%... It should be understood that the present invention is not limited thereto, and those skilled in the art can select the step size of the corresponding parameters according to actual needs.

[0068] Further, in one or more exemplary embodiments of the present invention, the multiple voltage sag parameter cycles further include one or more of a phase jump cycle, a voltage sag starting angle cycle, and a voltage harmonic distortion rate cycle.

[0069] Further, in one or more exemplary embodiments of the present invention, the phase jump cycle can be 0° to 360°, a fixed step size can be set, and the phase jump cycle includes at least 0° and 90°; the voltage sag starting angle cycle is 0° to 360°, a fixed step size can be set, and the voltage sag starting angle cycle includes at least 0° and 90°; the voltage harmonic distortion rate cycle is 0% to 100%.

[0070] Further, in one or more exemplary embodiments of the present invention, the voltage sag starting angle cycle is 0° to 90°.

[0071] Further, in one or more exemplary embodiments of the present invention, before step S20, there is also a step of setting a current-limiting resistor to prevent the AC contactor from short-circuiting.

[0072] Further, in one or more exemplary embodiments of the present invention, there is an interval time before changing the voltage control signal according to the sequence list, and the interval time is greater than 1 min. To eliminate random errors and the influence of the residual charge of the electromagnetic coil of the AC contactor, it is necessary to ensure that after each measurement, more than 1 min elapses before changing the parameters for re-measurement.

[0073] Further, in one or more exemplary embodiments of the present invention, the abscissa of the voltage tolerance curve of the AC contactor is the voltage sag duration, and the ordinate is the voltage sag magnitude. It should be understood that the present invention is not limited thereto, and those skilled in the art can select the form of the output curve according to actual needs.

[0074] Further, in one or more exemplary embodiments of the present invention, the automatic test method for the voltage tolerance curve of the AC contactor uses the automatic test device for the voltage tolerance curve of the AC contactor according to any one of the above technical solutions.

[0075] The automatic test device and method for the voltage tolerance curve of an AC contactor according to the present invention will be described in more detail by way of specific embodiments. It should be understood that the embodiments are only exemplary, and the present invention is not limited thereto.

[0076] Embodiment 1

[0077] In this embodiment, the automatic test device for the voltage tolerance curve of an AC contactor according to the present invention is adopted (refer to Figure 1 as shown), combined with Figure 2 as shown, and its test process is as follows:

[0078] Set the current-limiting resistor 41 to an appropriate value, and preset a sequence list, including setting the voltage harmonic distortion rate cycle, setting the phase jump cycle, setting the voltage sag starting angle cycle, setting the voltage sag duration cycle, and setting the voltage sag amplitude cycle;

[0079] The DSP module 30 generates a voltage control signal according to the sequence list, controls the inverter 23 to emit a voltage sag waveform, and determines whether the current detected by the current sensor has a sudden change. If no current mutation is detected, the voltage sag duration is increased by a corresponding step, and the DSP module 30 controls the inverter 23 to emit a voltage sag waveform again. If a current mutation is detected, the waveform and data are recorded;

[0080] Determine whether all voltage sag amplitudes have been tested (that is, determine whether the voltage sag amplitude is the maximum value of the voltage sag amplitude cycle). If not all voltage sag amplitudes have been tested, the voltage sag amplitude is increased by a corresponding step, and the DSP module 30 controls the inverter 23 to continue the loop test. If all voltage sag amplitudes have been tested, the voltage tolerance curve of the AC contactor is plotted;

[0081] Determine whether all voltage sag starting angles have been tested. If not all voltage sag starting angles have been tested, change the voltage sag starting angle, and the DSP module 30 controls the inverter to continue the loop test. If all voltage sag starting angles have been tested, further determine whether all phase jumps have been tested. If not all phase jumps have been tested, change the phase jump, and the DSP module 30 controls the inverter to continue the loop test. If all phase jumps have been tested, further determine whether all voltage harmonics have been tested. If not all voltage harmonics have been tested, change the voltage harmonic distortion rate, and the DSP module 30 controls the inverter to continue the loop test. If all voltage harmonics have been tested, according to the settings, plot the voltage tolerance curve cluster and output it to complete the test process.

[0082] Figure 3 is one of the voltage tolerance curves of the AC contactor obtained by using the device and method of this embodiment. The voltage harmonic distortion rate corresponding to this curve is 0%, the phase jump is 0°, and the voltage sag starting angle is 0°.

[0083] It should be understood that, for the device and method according to this embodiment, the test results can be freely output as required, or a set of AC contactor voltage withstand curves can be obtained. For example, a certain set of curves can include 13 AC contactor voltage withstand curves with a voltage harmonic distortion rate of 0%, a phase jump of 0°, and voltage sag start angles of 0º, 30º, 60º, 90º... 359º (step size of 30º).

[0084] The foregoing description of the specific exemplary embodiments of the present invention is for purposes of illustration and exemplification. These descriptions are not intended to limit the invention to the precise forms disclosed, and obviously, many changes and variations are possible in light of the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the present invention and its practical applications, so that those skilled in the art can implement and utilize various different exemplary embodiments of the present invention, as well as various different selections and changes. Any simple modifications, equivalent variations, and embellishments made to the above exemplary embodiments shall fall within the protection scope of the present invention.

Claims

1. An automatic test method for the voltage tolerance curve of an AC contactor, characterized in that, an automatic test device for the voltage tolerance curve of an AC contactor is adopted. The automatic test device includes: a rectification module for rectifying single-phase alternating current into direct current; an energy storage module for storing the direct current output by the rectification module; an inverter connected between the energy storage module and the electromagnetic coil of the AC contactor; a current-limiting resistor forming a series circuit with the main contact of the AC contactor and the output end of the energy storage module; a current sensor for detecting the current signal of the main contact of the AC contactor; and a DSP module for switching the voltage control signal used to control the output of the inverter according to the current signal detected by the current sensor, and the sequence list includes multiple voltage sag parameter cycles; the automatic test method at least includes the following steps: S10 Preset a sequence list, the sequence list includes multiple voltage sag parameter cycles and corresponding step sizes, and the multiple voltage sag parameter cycles at least include a voltage sag duration cycle and a voltage sag amplitude cycle; S20 Generate a voltage control signal according to the sequence list and send a voltage sag waveform to the AC contactor; S30 Judge whether current mutation occurs in the AC contactor, S31 If the judgment result is no, increase the voltage sag duration according to the preset step size and return to step S20; S32 If the judgment result is yes, record data and judge whether the voltage sag amplitude is the maximum value of the voltage sag amplitude cycle, S321 If the judgment result is no, increase the voltage sag amplitude according to the preset step size and return to step S20; S322 If the judgment result is yes, obtain the voltage tolerance curve of the AC contactor according to the recorded data; S40 Judge whether other voltage sag parameter cycles in the sequence list have been completed, S41 If the judgment result is no, change the voltage sag parameters according to the corresponding step size and return to step S20; S42 If the judgment result is yes, end the test.

2. The automatic test method for the voltage tolerance curve of an AC contactor according to claim 1, characterized in that, the voltage sag duration cycle is 1 ms to 300 ms, and the step size is 1 ms or 5 ms; the voltage sag amplitude cycle is 0% to 100%, and the step size is 5%.

3. The automatic test method for the voltage tolerance curve of an AC contactor according to claim 1, characterized in that, the multiple voltage sag parameter cycles further include one or more of a phase jump cycle, a voltage sag starting angle cycle, and a voltage harmonic distortion rate cycle.

4. The automatic test method for the voltage tolerance curve of an AC contactor according to claim 3, characterized in that, the phase jump cycle is 0° to 360°, and the phase jump cycle at least includes 0° and 90°; the voltage sag starting angle cycle is 0° to 360°, and the voltage sag starting angle cycle at least includes 0° and 90°; the voltage harmonic distortion rate cycle is 0% to 100%.

5. The automatic test method for the voltage tolerance curve of an AC contactor according to claim 4, characterized in that, The starting angle cycle of the voltage sag is 0° to 90°.

6. The automatic test method for the voltage tolerance curve of an AC contactor according to claim 1, characterized in that, before the step S20, the following step is further included: Setting a current-limiting resistor to prevent the AC contactor from short-circuiting.

7. The automatic test method for the voltage tolerance curve of an AC contactor according to claim 1, characterized in that, There is an interval time before changing the voltage control signal according to the sequence list, and the interval time is greater than 1 minute.

8. The automatic test method for the voltage tolerance curve of an AC contactor according to claim 1, characterized in that, The abscissa of the voltage tolerance curve of the AC contactor is the voltage sag duration, and the ordinate is the voltage sag amplitude.

9. The automatic test method for the voltage tolerance curve of an AC contactor according to claim 1, characterized in that, The current signal is a current mutation signal.

10. The automatic test method for the voltage tolerance curve of an AC contactor according to claim 1, characterized in that, The automatic test device further includes: A plurality of wiring terminals, and the AC contactor is detachably connected through the plurality of wiring terminals.

11. The automatic test method for the voltage tolerance curve of an AC contactor according to claim 10, characterized in that, The electromagnetic coil is connected to the inverter through the wiring terminal; the main contact is connected to the output end of the energy storage module through the wiring terminal.

12. The automatic test method for the voltage tolerance curve of an AC contactor according to claim 1, characterized in that, The automatic test device further includes: A human-computer interaction module, which is communicatively connected to the DSP module.

13. The automatic test method for the voltage tolerance curve of an AC contactor according to claim 1, characterized in that, The current-limiting resistor is a variable resistor, and the resistance value of the current-limiting resistor is adjusted by the DSP module.

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