A test system, method, equipment and medium for an excitation overvoltage protection device

Abstract

The present application discloses a test system, method, equipment and medium for an excitation overvoltage protection device, the system comprising: a power module, comprising a rectifier circuit, an inverter circuit, a step-up transformer, a high-voltage rectifier circuit, a low-voltage rectifier circuit and a commutation interlocking circuit; the rectifier circuit is connected to the inverter circuit, the inverter circuit is connected to the step-up transformer, the step-up transformer is connected to the high-voltage rectifier circuit and the low-voltage rectifier circuit, the high-voltage rectifier circuit and the low-voltage rectifier circuit are connected to a device under test through a commutation interlocking circuit; a control module, in which a key is connected to a microcontroller, the microcontroller is connected to a D / A conversion circuit and a display, the D / A conversion circuit is connected to a power controller, a high / low voltage feedback switching circuit and a commutation interlocking circuit, and the power controller is connected to the inverter circuit; a device under test, the device under test is connected to a signal acquisition circuit, the signal acquisition circuit is connected to an A / D conversion circuit, and the A / D conversion circuit is connected to the microcontroller.

Description

Technical Field

[0001] The present application relates to the field of generators, and in particular to a test system, method, equipment, and medium for an excitation overvoltage protection device. Background Art

[0002] For generator sets, the stability of the excitation system directly affects the stability of the unit's operation, and overvoltage has a great impact on the excitation system. Long-term overvoltage can damage the insulation of the excitation system and even directly destroy system components, endangering the unit and personal safety. Therefore, the generator excitation overvoltage protection device is an important protection device that must be equipped in the generator set, and its reliability is directly related to the safety of the generator set and the power grid. In order to ensure the reliability and safety of the generator excitation overvoltage protection device, it is an indispensable task to perform overvoltage testing on it, which is crucial to the safe operation of the generator.

[0003] In the prior art, the test of the generator excitation overvoltage protection device is usually carried out by using a megohmmeter or a "voltage withstand device + oscilloscope" method. The test power is low and the operation process is complicated, making it difficult to obtain accurate measurement results. Traditionally, the overvoltage test of the generator excitation overvoltage protection device and its controller is carried out separately using two sets of devices due to different test voltages. Currently, there is still a lack of a test system that can combine these two sets of devices to realize the test of the excitation overvoltage protection device and its controller. Summary of the invention

[0004] The present application provides a test system, method, equipment, and medium for an excitation overvoltage protection device, which solves the technical problem that it is difficult to test the excitation overvoltage protection device through a set of systems.

[0005] A test system for an excitation overvoltage protection device, comprising:

[0006] A power module, the power module comprising a rectifier circuit, an inverter circuit, a step-up transformer, a high-voltage rectifier circuit, a low-voltage rectifier circuit, and a commutation interlocking circuit;

[0007] The rectifier circuit is connected to the inverter circuit, the inverter circuit is connected to the step-up transformer, the step-up transformer is connected to the high-voltage rectifier circuit and the low-voltage rectifier circuit, and the high-voltage rectifier circuit and the low-voltage rectifier circuit are connected to the device under test through a commutation interlocking circuit;

[0008] A control module, the control module comprising a button, a microcontroller, a power controller, a high / low voltage feedback switching circuit, a signal acquisition circuit, an analog-to-digital A / D conversion circuit, a digital-to-analog D / A conversion circuit, and a display;

[0009] The button is connected to the microcontroller, the microcontroller is connected to the D / A conversion circuit and the display, the D / A conversion circuit is connected to the power controller, the high / low voltage feedback switching circuit, and the commutation interlock circuit, and the power controller is connected to the inverter circuit;

[0010] The device under test is connected to the signal acquisition circuit, the signal acquisition circuit is connected to the A / D conversion circuit, and the A / D conversion circuit is connected to the microcontroller.

[0011] In one embodiment of the present application, the power controller includes:

[0012] An error amplifier, wherein the non-inverting input terminal of the error amplifier is connected to a reference voltage, the inverting input terminal is connected to a system output voltage, and the output terminal is connected to a pulse width modulation (PWM) modulator;

[0013] A PWM modulator is connected to the output end of the error amplifier and is used to generate a PWM signal with adjustable pulse width according to the error amplified signal output by the error amplifier.

[0014] In one embodiment of the present application, the commutation interlock circuit includes:

[0015] A first relay, a second relay, and a plurality of reed switches;

[0016] The pin 3 of the first relay is connected to the pin 3 and the pin 6 of the second relay respectively, and a diode is connected between the pin 1 and the pin 8 of the first relay and the second relay.

[0017] In one embodiment of the present application, the high / low voltage feedback switching circuit includes:

[0018] The third relay, pin 1 of the third relay is connected to a +12V voltage, pin 8 is connected to the output end of the D / A conversion circuit, pins 3 and 6 are connected to the low-voltage output voltage, pins 2 and 7 are connected to the voltage feedback signal UN, and pins 4 and 5 are connected to the high-voltage output voltage.

[0019] In one embodiment of the present application, the test system includes a high voltage output mode and a low voltage output mode, wherein the high voltage output mode outputs a 2500V high voltage DC voltage, and the low voltage output mode outputs a 300V low voltage DC voltage.

[0020] A method for testing an excitation overvoltage protection device, comprising:

[0021] Outputting high voltage to the device under test in a high voltage output mode and outputting low voltage to the device under test in a low voltage output mode by means of a power supply module;

[0022] The control module collects the signals of the device under test in the high-voltage output mode and the signals of the device under test in the low-voltage output mode, and displays the collected information on the display.

[0023] In one embodiment of the present application, outputting a high voltage to the device under test in a high voltage output mode and outputting a low voltage to the device under test in a low voltage output mode by the power module specifically includes:

[0024] The 220V AC voltage is output as a DC voltage through a rectifier circuit, the DC voltage is output as a high-frequency AC voltage through an inverter circuit, and the high-frequency AC voltage is output as a first high-frequency AC voltage and a second high-frequency AC voltage through a step-up transformer;

[0025] Outputting the first high-frequency AC voltage into a high-voltage DC voltage through a high-frequency rectification circuit, and outputting the second high-frequency AC voltage into a low-voltage DC voltage through a low-voltage rectification circuit;

[0026] The high-voltage direct current voltage and the low-voltage direct current voltage output voltage to the device under test through a commutation interlocking circuit.

[0027] In one embodiment of the present application, the collecting, by the control module, a signal of the device under test in the high-voltage output mode and a signal of the device under test in the low-voltage output mode, and displaying the collected information on a display, specifically includes:

[0028] Inputting instructions to the microcontroller through a key, the microcontroller sends a control signal to the D / A conversion circuit according to the instruction, the D / A conversion circuit converts the control signal from a digital signal to an analog signal, and inputs the analog signal to the power controller, the commutation interlock circuit and the high / low voltage feedback switching circuit;

[0029] A pulse width modulation (PWM) signal with adjustable pulse width is generated by the power controller and input to the gate of the high-frequency switch device of the inverter circuit. The output voltage of the inverter circuit is controlled by controlling the duty cycle of the high-frequency switch device.

[0030] A test device for an excitation overvoltage protection device, comprising:

[0031] at least one processor; and,

[0032] a memory communicatively connected to the at least one processor; wherein,

[0033] The memory stores instructions executable by the at least one processor, the instructions being executed by the at least one processor to enable the at least one processor to:

[0034] Outputting high voltage to the device under test in a high voltage output mode and outputting low voltage to the device under test in a low voltage output mode by means of a power supply module;

[0035] The control module collects the signals of the device under test in the high-voltage output mode and the signals of the device under test in the low-voltage output mode, and displays the collected information on the display.

[0036] A non-volatile storage medium storing computer executable instructions, wherein the computer executable instructions are configured to:

[0037] Outputting high voltage to the device under test in a high voltage output mode and outputting low voltage to the device under test in a low voltage output mode by means of a power supply module;

[0038] The control module collects the signals of the device under test in the high-voltage output mode and the signals of the device under test in the low-voltage output mode, and displays the collected information on the display.

[0039] The present application provides a test system, method, device, and medium for an excitation overvoltage protection device, which at least include the following beneficial effects: the test system provided by the present application has two output modes, high voltage output and low voltage output. In the high voltage output mode, the excitation overvoltage protection device can be tested, and in the low voltage output mode, the controller of the excitation overvoltage protection device can be tested, thereby completing the test of the excitation overvoltage protection device and its controller through a set of devices, with high test efficiency and convenient operation. The reference signal of the power supply controller is controlled by a microcontroller, and the duty cycle of the PWM signal can be changed by changing the reference signal through the microcontroller, thereby adjusting and stabilizing the output voltage of the system. The high / low voltage feedback switching circuit can be used to switch between high / low voltage output feedback. The direction of the high / low voltage output can be switched through the reversing interlocking circuit, so that the device under test can be tested in both positive / negative directions, and the interlocking of the high / low voltage output can be realized at the same time, ensuring that the low voltage output is locked when the high voltage output is output, and the high voltage output is locked when the low voltage output is output. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0041] Figure 1 A schematic diagram of the composition of a test system for an excitation overvoltage protection device provided in an embodiment of the present application;

[0042] Figure 2 A schematic diagram of a power supply controller provided in an embodiment of the present application;

[0043] Figure 3a A schematic diagram of the first part of the reversing interlocking circuit provided in an embodiment of the present application;

[0044] Figure 3b A second partial schematic diagram of a commutation interlock circuit provided in an embodiment of the present application;

[0045] Figure 3c A third partial schematic diagram of the reversing interlocking circuit provided in an embodiment of the present application;

[0046] Figure 4 A schematic diagram of a high / low voltage feedback switching circuit provided in an embodiment of the present application;

[0047] Figure 5 A schematic diagram of the composition of a test device for an excitation overvoltage protection device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be described clearly and completely in conjunction with the specific embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0049] For generator sets, the stability of the excitation system directly affects the stability of the unit's operation, and overvoltage has a great impact on the system. Long-term overvoltage can damage the system insulation and even directly destroy system components, endangering the unit and personal safety. Therefore, the generator excitation overvoltage protection device is an important protection device that must be equipped in the generator set, and its reliability is directly related to the safety of the generator set and the power grid. In order to ensure the reliability and safety of the generator excitation overvoltage protection device, it is an indispensable task to perform overvoltage testing on it, which is crucial to the safe operation of the generator.

[0050] Currently, the test of the generator excitation overvoltage protection device is usually carried out by using an ohmmeter or a "voltage withstand device + oscilloscope" method. The test power is low and the operation process is complicated, making it difficult to obtain accurate measurement results. Traditionally, the overvoltage test of the generator excitation overvoltage protection device and its controller is carried out separately using two sets of devices due to the different test voltages. Currently, there is still a lack of a test system that can combine these two sets of devices to implement the test of the excitation overvoltage protection device and its controller. In order to solve the above problems, the present application proposes a test system, method, equipment, and medium for an excitation overvoltage protection device. The details are described below.

[0051] like Figure 1The figure shows a structural block diagram of a test system for an excitation overvoltage protection device provided in an embodiment of the present application.

[0052] Figure 1 The power module includes a rectifier circuit, an inverter circuit, a step-up transformer, a high-voltage rectifier circuit, a low-voltage rectifier circuit, and a commutation interlocking circuit. The rectifier circuit is connected to the inverter circuit, the inverter circuit is connected to the step-up transformer, and the step-up transformer is connected to the high-voltage rectifier circuit and the low-voltage rectifier circuit. The high-voltage rectifier circuit outputs high voltage to the commutation interlocking circuit, and then the commutation interlocking circuit outputs high voltage to the device under test; the low-voltage rectifier circuit outputs low voltage to the commutation interlocking circuit, and then the commutation interlocking circuit outputs low voltage to the device under test.

[0053] The control module includes a button, a microcontroller, a power controller, a high / low voltage feedback switching circuit, a signal acquisition circuit, an A / D conversion circuit, a D / A conversion circuit, and a display. The button is connected to the microcontroller, the microcontroller is connected to the D / A conversion circuit, the D / A conversion circuit is connected to the power controller, the high / low voltage feedback switching circuit and the commutation interlock circuit, and the power controller is connected to the inverter circuit. The commutation interlock circuit is connected to the power controller through the high / low voltage feedback switching circuit.

[0054] The device under test is connected to a signal acquisition circuit, and the signal acquisition circuit is connected to a microcontroller via an A / D conversion circuit. The microcontroller is connected to a display.

[0055] In one embodiment of the present application, the test system includes a high voltage output mode and a low voltage output mode, wherein the high voltage output mode outputs a 2500V high voltage DC voltage, and the low voltage output mode outputs a 300V low voltage DC voltage.

[0056] In one embodiment of the present application, a power supply controller includes: an error amplifier, wherein a non-inverting input terminal of the error amplifier is connected to a reference voltage, an inverting input terminal is connected to a system output voltage, and an output terminal is connected to a pulse width modulation (PWM) modulator;

[0057] The PWM modulator is connected to the output end of the error amplifier and is used to generate a PWM signal with adjustable pulse width according to the error amplification signal output by the error amplifier.

[0058] Specifically, Figure 2 As shown, the power supply controller mainly includes an error amplifier and a PWM modulator. The error amplifier's non-inverting input terminal IN+ is connected to a reference voltage DA, the inverting input terminal IN- is connected to a system output voltage UN, and the output terminal is connected to a PWM modulator. A circuit in which a capacitor C2 and a resistor R1 are connected in series and then in parallel with a capacitor C1 is connected between the inverting input terminal and the output terminal. The error amplifier outputs an error amplified signal, which is transmitted to the PWM modulator, and the PWM modulator generates a PWM signal with adjustable pulse width.

[0059] In one embodiment of the present application, the commutation interlock circuit includes: a first relay J1, a second relay J2, and a plurality of reed switches; pin 3 of the first relay J1 is respectively connected to pin 3 and pin 6 of the second relay J2, and a diode is connected between pin 1 and pin 8 of the first relay J1 and the second relay J2.

[0060] Specifically, as shown in FIG3 , the reversing interlocking circuit includes three circuits: a, b, and c. Circuit a mainly includes diodes D10 and D11, relays J1 and J2, wherein relay J1 is a high-low voltage interlocking relay, and relay J2 is a high-voltage reversing relay. Circuit b mainly includes reed switches CR1, CR2, CR3, CR4, diodes D1 and D3. Circuit c mainly includes diode D2 and reed switch CR9.

[0061] The commutation interlock circuit formed by the first relay J1, the second relay J2, and a number of reed switches can be used as both a commutation circuit and an interlock circuit. The commutation circuit is used to switch the positive and negative directions of the high-voltage output voltage. The interlock circuit is used for interlocking high / low voltage outputs, so that the system locks the low-voltage output in the high-voltage output mode and locks the high-voltage output in the low-voltage output mode.

[0062] Figure 3a The switch signal CTL1 connected to the 8th pin of the relay J2 in the circuit, the switch signal CTL2 connected to the 8th pin of the relay J1, and the switch signal CTL3 connected to the 2nd pin of the reed switch CR9 in the circuit c are all switch signals issued by the control module, and have two states: grounded (1) and suspended (0).

[0063] In one embodiment of the present application, the high / low voltage feedback switching circuit includes: a third relay J3, pin 1 of the third relay J3 is connected to a +12V voltage, pin 8 is connected to the output end of the D / A conversion circuit, pins 3 and 6 are connected to the low voltage output voltage, pins 2 and 7 are connected to the voltage feedback signal UN, and pins 4 and 5 are connected to the high voltage output voltage.

[0064] like Figure 4 As shown, the high / low voltage feedback switching circuit includes a third relay J3, wherein pin 1 of the third relay J3 is connected to a +12V voltage, pins 2 and 7 are connected to a voltage feedback signal UN, pins 3 and 6 are connected to a low voltage output voltage UNL, pins 4 and 5 are connected to a high voltage output voltage UNH, and pin 8 is connected to an output end of a D / A conversion circuit. A diode D19 is also connected between pins 1 and 8.

[0065] The present application also provides a method corresponding to the above system, which may include the following steps:

[0066] S101: Outputting high voltage to the device under test in a high voltage output mode through a power module, and outputting low voltage to the device under test in a low voltage output mode.

[0067] In one embodiment of the present application, Figure 1 As shown, the 220V AC voltage is output as a DC voltage through a rectifier circuit, the DC voltage is output as a high-frequency AC voltage through an inverter circuit, and the high-frequency AC voltage is output as a first high-frequency AC voltage U1 and a second high-frequency AC voltage U2 through a step-up transformer;

[0068] The first high-frequency AC voltage U1 is output as a high-voltage DC voltage UH through a high-frequency rectification circuit, and the second high-frequency AC voltage U2 is output as a low-voltage DC voltage UL through a low-voltage rectification circuit;

[0069] The high-voltage DC voltage UH and the low-voltage DC voltage UL output voltage to the device under test through a commutation interlocking circuit.

[0070] S102: Collecting signals of the device under test in the high-voltage output mode and signals of the device under test in the low-voltage output mode through the control module, and displaying the collected information on a display.

[0071] In one embodiment of the present application, a command is input to the microcontroller by pressing a button, and the microcontroller sends a control signal to the D / A conversion circuit according to the command, and the D / A conversion circuit converts the control signal from a digital signal to an analog signal, and inputs the analog signal to the power controller, the commutation interlock circuit, and the high / low voltage feedback switching circuit;

[0072] Specifically, the control signal DA sent by the microcontroller through the D / A conversion circuit is used as a reference signal and input into the non-inverting input terminal IN+ of the error amplifier. The system output voltage signal UN is used as a feedback signal and input into the inverting input terminal IN- of the error amplifier. The error amplifier outputs an error amplified signal and transmits it to the PWM modulator. The PWM modulator generates a PWM signal with adjustable pulse width.

[0073] A pulse width modulated PWM signal with adjustable pulse width is generated by a power controller and input into the gate of the high-frequency switching device of the inverter circuit. The output voltage of the inverter circuit is controlled by controlling the duty cycle of the high-frequency switching device.

[0074] In one embodiment of the present application, the microcontroller sends a reed switch signal MODE1 to the high / low voltage feedback switching circuit through a D / A conversion circuit. The reed switch signal MODE1 has two states, including suspended and grounded. When MODE1 is suspended, the contact 2 and contact 3 of the relay J3 are energized, the voltage feedback signal UN is connected to the low voltage output voltage UNL, and the system output feedback is low voltage DC feedback; when MODE1 is grounded, the contact 2 and contact 3 of the relay J3 are disconnected and energized with the contact 4, the voltage feedback signal UN is connected to the high voltage output voltage UNH, and the system output feedback is switched to high voltage DC feedback.

[0075] The voltage output by the commutation interlock circuit is fed back to the power controller through the high / low voltage feedback switching circuit. The high / low voltage feedback switching circuit is controlled by the microcontroller and is responsible for switching the high / low voltage output feedback. The signal acquisition circuit is responsible for collecting the voltage, current, and temperature signals of the device under test and transmitting them to the A / D conversion circuit. The A / D conversion circuit converts the analog quantity into a digital quantity and uploads it to the microcontroller. The microcontroller processes the information and then outputs it to the display.

[0076] In one embodiment of the present application, the commutation interlocking circuit can realize two functions: high-low voltage interlocking and high-voltage output commutation.

[0077] Specifically, the high-low voltage interlocking function locks the low voltage output in the high voltage output mode, and locks the high voltage output in the low voltage output mode.

[0078] When preparing for high voltage output, the switch signal CTL2 sent by the control module is in a suspended state. Figure 3a The contact 2 and contact 3 of the first relay J1 are closed, and the contact 4 is disconnected. Figure 3c The 12VA point is in a suspended state. No matter the switch signal CTL3 is grounded or suspended, the contacts 3 and 4 of the reed switch CR9 are always in a disconnected state, that is, the output terminal OUT3 is disconnected from the low-voltage DC bus DCLL, thereby locking the low-voltage output.

[0079] When preparing for low voltage output, the switch signal CTL2 sent by the control module is in the ground state. Figure 3a The contact 2 and contact 4 of the first relay J1 are closed, and the contact 3 is disconnected. Figure 3c The 12VA point in the middle is connected to a 12V voltage, and the switch signal CTL3 can normally control the reed switch CR9 (when the switch signal CTL3 is grounded, the contacts 3 and 4 of the reed switch CR9 are energized, and the output is low voltage). The 3rd pin of the second relay J2 is left floating. Figure 3c The 1+2- and 1-2+ points are left floating, and the reed switches CR1 to CR4 are disconnected, thereby locking the high voltage output.

[0080] The high voltage output switching function is to switch the positive and negative directions of the high voltage output voltage. When the high voltage is output, the switch signal CTL2 is suspended. On this basis, if the switch signal CTL1 is suspended, Figure 3a The contact 2 of the second relay J2 is disconnected from the contact 4 and connected to the contact 3, and the 1+2-point is connected to the +12V voltage. Figure 3b The contacts 3 and 4 of the middle reed switch CR2 and the reed switch CR3 are energized. At this time, the output terminal OUT1 is connected to the high-voltage DC bus DCHL, which is the positive pole, and the output terminal OUT2 is connected to the common ground E, which is the negative pole. If the switch signal CTL1 is grounded, Figure 3a The contact 2 of the second relay J2 is disconnected from the contact 3 and is closed to the contact 4, and the 1-2+ point is connected to the +12V voltage. Figure 3b Contacts 3 and 4 of the middle reed switch CR1 and the reed switch CR4 are energized. At this time, the output terminal OUT1 is connected to the common ground E, which is the negative pole, and the output terminal OUT2 is connected to the high-voltage DC bus DCHL, which is the positive pole, and the output voltage direction is reversed.

[0081] The above is a test method for an excitation overvoltage protection device provided in an embodiment of the present application. Based on the same inventive idea, an embodiment of the present application also provides a corresponding test device for an excitation overvoltage protection device, such as Figure 5 shown.

[0082] This embodiment provides a test device for an excitation overvoltage protection device, including:

[0083] at least one processor; and,

[0084] a memory communicatively connected to at least one processor; wherein,

[0085] The memory stores instructions executable by at least one processor, the instructions being executed by at least one processor to enable the at least one processor to:

[0086] Output high voltage to the device under test in a high voltage output mode through the power module, and output low voltage to the device under test in a low voltage output mode;

[0087] The control module collects the signals of the device under test in the high-voltage output mode and the signals of the device under test in the low-voltage output mode, and displays the collected information on the display.

[0088] Based on the same idea, some embodiments of the present application also provide a medium corresponding to the above method.

[0089] Some embodiments of the present application provide a storage medium storing computer executable instructions, where the computer executable instructions are configured as follows:

[0090] Output high voltage to the device under test in a high voltage output mode through the power module, and output low voltage to the device under test in a low voltage output mode;

[0091] The control module collects the signals of the device under test in the high-voltage output mode and the signals of the device under test in the low-voltage output mode, and displays the collected information on the display.

[0092] Each embodiment in this application is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the method and medium embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiments.

[0093] The methods and media provided in the embodiments of the present application correspond one-to-one to the method, and therefore, the methods and media also have similar beneficial technical effects as the corresponding methods. Since the beneficial technical effects of the methods have been described in detail above, the beneficial technical effects of the methods and media will not be repeated here.

[0094] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or method including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or method. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or method including the elements.

[0095] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included within the scope of the claims of the present application.

Claims

1. A test system for an excitation overvoltage protection device, characterized in that: include: A power module, the power module comprising a rectifier circuit, an inverter circuit, a step-up transformer, a high-voltage rectifier circuit, a low-voltage rectifier circuit, and a commutation interlocking circuit; The rectifier circuit is connected to the inverter circuit, the inverter circuit is connected to the step-up transformer, the step-up transformer is connected to the high-voltage rectifier circuit and the low-voltage rectifier circuit, and the high-voltage rectifier circuit and the low-voltage rectifier circuit are connected to the device under test through a commutation interlocking circuit; A control module, the control module comprising a button, a microcontroller, a power controller, a high / low voltage feedback switching circuit, a signal acquisition circuit, an analog-to-digital A / D conversion circuit, a digital-to-analog D / A conversion circuit, and a display; The button is connected to the microcontroller, the microcontroller is connected to the D / A conversion circuit and the display, the D / A conversion circuit is connected to the power controller, the high / low voltage feedback switching circuit, and the commutation interlock circuit, and the power controller is connected to the inverter circuit; The device under test is connected to the signal acquisition circuit, the signal acquisition circuit is connected to the A / D conversion circuit, and the A / D conversion circuit is connected to the microcontroller.

2. The system according to claim 1, characterized in that The power controller comprises: An error amplifier, wherein the non-inverting input terminal of the error amplifier is connected to a reference voltage, the inverting input terminal is connected to a system output voltage, and the output terminal is connected to a pulse width modulation (PWM) modulator; A PWM modulator is connected to the output end of the error amplifier and is used to generate a PWM signal with adjustable pulse width according to the error amplified signal output by the error amplifier.

3. The system according to claim 1, characterized in that The commutation interlock circuit comprises: A first relay, a second relay, and a plurality of reed switches; The pin 3 of the first relay is connected to the pin 3 and the pin 6 of the second relay respectively, and a diode is connected between the pin 1 and the pin 8 of the first relay and the second relay.

4. The system according to claim 1, characterized in that The high / low voltage feedback switching circuit comprises: The third relay, pin 1 of the third relay is connected to a +12V voltage, pin 8 is connected to the output end of the D / A conversion circuit, pins 3 and 6 are connected to the low-voltage output voltage, pins 2 and 7 are connected to the voltage feedback signal UN, and pins 4 and 5 are connected to the high-voltage output voltage.

5. The system according to claim 1, characterized in that The test system includes a high voltage output mode and a low voltage output mode, wherein the high voltage output mode outputs a 2500V high voltage DC voltage, and the low voltage output mode outputs a 300V low voltage DC voltage.

6. A method for testing an excitation overvoltage protection device, applied to a system according to any one of claims 1 to 5, characterized in that: The method comprises: Outputting high voltage to the device under test in a high voltage output mode and outputting low voltage to the device under test in a low voltage output mode by means of a power supply module; The control module collects the signals of the device under test in the high-voltage output mode and the signals of the device under test in the low-voltage output mode, and displays the collected information on the display.

7. The method according to claim 6, characterized in that The step of outputting a high voltage to the device under test by the power module in a high voltage output mode and outputting a low voltage to the device under test in a low voltage output mode specifically includes: The 220V AC voltage is output as a DC voltage through a rectifier circuit, the DC voltage is output as a high-frequency AC voltage through an inverter circuit, and the high-frequency AC voltage is output as a first high-frequency AC voltage and a second high-frequency AC voltage through a step-up transformer; Outputting the first high-frequency AC voltage into a high-voltage DC voltage through a high-frequency rectification circuit, and outputting the second high-frequency AC voltage into a low-voltage DC voltage through a low-voltage rectification circuit; The high-voltage direct current voltage and the low-voltage direct current voltage output voltage to the device under test through a commutation interlocking circuit.

8. The method according to claim 6, characterized in that The collecting, by the control module, the signal of the device under test in the high-voltage output mode and the signal of the device under test in the low-voltage output mode, and displaying the collected information on the display, specifically includes: Inputting instructions to the microcontroller through a key, the microcontroller sends a control signal to the D / A conversion circuit according to the instruction, the D / A conversion circuit converts the control signal from a digital signal to an analog signal, and inputs the analog signal to the power controller, the commutation interlock circuit and the high / low voltage feedback switching circuit; The power controller generates a pulse width modulated PWM signal with adjustable pulse width and inputs it into the gate of the high-frequency switch device of the inverter circuit. The output voltage of the inverter circuit is controlled by controlling the duty cycle of the high-frequency switch device.

9. A test device for an excitation overvoltage protection device, applied to the system according to any one of claims 1 to 5, characterized in that: include: at least one processor; as well as, a memory communicatively connected to the at least one processor; wherein, The memory stores instructions executable by the at least one processor, the instructions being executed by the at least one processor to enable the at least one processor to: Outputting high voltage to the device under test in a high voltage output mode and outputting low voltage to the device under test in a low voltage output mode by means of a power supply module; The control module collects the signals of the device under test in the high-voltage output mode and the signals of the device under test in the low-voltage output mode, and displays the collected information on the display.

10. A non-volatile storage medium storing computer executable instructions, applied to the system according to any one of claims 1 to 5, characterized in that: The computer executable instructions are configured to: Outputting high voltage to the device under test in a high voltage output mode and outputting low voltage to the device under test in a low voltage output mode by means of a power supply module; The control module collects the signals of the device under test in the high-voltage output mode and the signals of the device under test in the low-voltage output mode, and displays the collected information on the display.

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