Experimental multifunctional power supply processing device and connector experimental testing device

Abstract

The present invention discloses a multifunctional power supply processing device for experiments and a connector experimental detection device, wherein the power supply processing device comprises three electrically controlled valve groups, a positive output terminal and a conversion control switch group; each electrically controlled valve group comprises at least two groups of current valve control components, a phase power input terminal and a phase power output terminal, and each group of current valve control components comprises a number of high-power controllable semiconductor switch tubes electrically connected together; the conversion control switch group comprises a selection switch group and a connection switch group; the selection switch group is used to selectively connect the current valve control components in each electrically controlled valve group to the positive output terminal or the phase power output terminal; the connection switch group is used to connect or disconnect the current path between two electrically controlled valve groups connected to each other; based on the above-mentioned power supply processing device, high-voltage and large-capacity AC experiments and DC experiments can be performed on circuit breakers or fuses without changing the experimental site and experimental equipment, thereby effectively saving experimental costs.

Description

Technical Field

[0001] The invention relates to the technical field of high-voltage and large-capacity connection switch detection, and in particular to a multifunctional power supply processing device for large-capacity experiments and a large container connector experimental detection device. Background Art

[0002] High-voltage and large-capacity connecting switches include circuit breakers, fuses and other devices. Circuit breakers are an important guarantee for the smooth removal of short-circuit faults when short-circuit faults occur in the power system, and can realize normal switching of electrical equipment when load opening and closing operations are required. Whether it is an AC circuit breaker or a DC circuit breaker, the arc process when opening and closing a power system fault or load is a complex process involving the interaction of electromagnetic fields, flow fields, and thermal fields. However, theoretical research on arcs in the circuit breaker opening process still lags behind actual needs. At present, it is not possible to completely rely on theoretical analysis and quantitative calculation methods to design circuit breakers that meet various opening and closing performances. Therefore, the opening and closing test of the circuit breaker is particularly important. It is an important means to study and evaluate the various opening and closing performances of the circuit breaker, and to test whether the structural design, manufacturing process and material selection of the arc extinguishing chamber and other parts are reasonable.

[0003] The breaking test circuit of AC large-capacity circuit breaker uses a generator as a power source, a reactor as a test current regulating element, and a corresponding phase-selection closing switch, a circuit breaker and a measurement and control part to form a test system. When conducting the test, the machine-end voltage and the parameters of the reactor element are selected according to the test requirements. The connection of the test circuit is realized by the phase-selection closing device. The sample circuit breaker passes the set test current. After the test circuit breaker breaks the current, the auxiliary circuit breaker cuts off the test main circuit. The phase-selection closing switch in the traditional AC large-capacity test circuit uses a mechanical switch such as a permanent magnetic vacuum circuit breaker, a pneumatic circuit breaker, a vacuum contactor and other phase-selection actuators to realize the closing device that connects the power supply and the load circuit at an arbitrarily selected phase angle of the AC test power supply voltage waveform, which is suitable for AC test circuits. The DC test circuit power supply consists of a rectifier bridge, an opening circuit breaker, a closing circuit breaker, a resistor, an inductor and a data acquisition system. The grid power supply is stepped down by the transformer and then rectified into a DC source through a rectifier bridge. The required DC current is then obtained by setting the corresponding resistance and inductance. The real-time DC voltage and DC current can be effectively collected through the data acquisition system.

[0004] From this, we can see that, first of all, the high-voltage and high-current phase-selective closing switches currently used in the industry are all mechanical contact switches, most of which use pneumatic control or permanent magnet operating mechanisms. The control is complex, and due to the large number of intermediate control components, the failure rate is high, the repeatability is poor, and the service life is very short. Due to problems with the contact material and assembly process, the ablated contact surface needs to be processed after a certain period of operation, otherwise it will affect the accuracy of the phase selection and closing, and affect the success rate of the test. Moreover, due to the very complex transmission system and contact ablation, the reliability and service life of the mechanical phase-selective switch are reduced to a certain extent.

[0005] Secondly, due to the large investment in high-voltage DC test circuits and low utilization rates, the DC circuit breaker test voltage levels at test stations are mostly lower than 2000 V. Due to the low DC test voltage, the short-circuit capacity of high-voltage DC switchgear is currently verified by low-frequency AC tests simulating DC tests, and there is great controversy over the test equivalence.

[0006] In addition, the current traditional AC test uses completely different equipment to achieve the phase selection and closing function and the DC test rectification function. The two devices are not compatible, belong to different test systems, have different principles, and are independent of each other. There is no corresponding device to achieve the purpose of sharing the AC and DC test circuits, which requires the test station to provide more venues and corresponding supporting facilities. Summary of the invention

[0007] One of the purposes of the present invention is to provide a multifunctional power supply processing device for experiments, so as to integrate the phase selection and closing function of the AC test of a high-voltage and large-capacity power connector with the rectification function of the DC test, while improving the adjustment accuracy and service life of the phase selection and closing switch.

[0008] Another object of the present invention is to provide a connector test detection device to integrate the phase selection and closing function of the AC test of a high-voltage and large-capacity power connector with the rectification function of the DC test, while improving the adjustment accuracy and service life of the phase selection and closing switch.

[0009] In order to achieve the above object, the present invention discloses a multifunctional power supply processing device for large-capacity experiments, which comprises:

[0010] Three electrically controlled valve groups corresponding to three-phase electricity respectively, each of the electrically controlled valve groups comprises at least two groups of current valve control components, a phase electricity input terminal and a phase electricity output terminal, each group of the current valve control components comprises a number of high-power controllable semiconductor switch tubes electrically connected together; at least two groups of the current valve control components in any phase of the electrically controlled valve group are reversely connected in parallel between the phase electricity input terminal and the phase electricity output terminal;

[0011] Positive output terminal;

[0012] A conversion control switch group, which includes a selection switch group and a connection switch group;

[0013] The selection switch group is used to selectively ground the current valve control component in each of the electric control valve groups to the positive output terminal or the phase power output terminal;

[0014] The connecting switch group is used to connect or disconnect the current path between the two electrically controlled valve groups connected to each other; by controlling the working states of the selection switch group and the connecting switch group, the current valve control component in each electrically controlled valve group can be used for phase selection, closing or rectification.

[0015] Preferably, the controllable semiconductor switch tube is a thyristor.

[0016] Preferably, several of the controllable semiconductor switch tubes in each group of the current valve control components are mixed together in series and parallel, and a resistance-capacitance absorption circuit is connected in parallel at both ends of several of the controllable semiconductor switch tubes in each group to limit the voltage rise rate of the controllable semiconductor switch tubes.

[0017] Preferably, the electrically controlled valve group includes a first valve group, a second valve group and a third valve group, and the connecting switch group includes a first switch electrically connected between the first valve group and the second valve group and a second switch electrically connected between the second valve group and the third valve group.

[0018] Preferably, it further comprises a control device, which is communicatively connected with the current valve control component and the conversion control switch group and is used to control the working states of the current valve control component and the conversion control switch group.

[0019] Preferably, the control device includes a main controller and a signal acquisition device, a trigger control device and a switch control device which are communicatively connected to the main controller; the signal acquisition device is used to acquire electrical signals at the input or output end of the electric control valve group; the trigger control device is used to send a trigger signal to the current valve control component to control the working state of the current valve control component; the switch control device is used to control the working state of different switches in the conversion control switch group.

[0020] Preferably, the control device further comprises an unlocking control device communicatively connected to the master controller, wherein the unlocking control device is used to lock or release the current valve control component.

[0021] Preferably, the trigger control device includes three independent trigger controllers respectively connected to the master controller for communication, and each of the trigger controllers corresponds to a group of the electric-controlled valve groups.

[0022] Preferably, each of the trigger controllers is communicatively connected to the master controller via an optical fiber splitter, and the optical fiber splitter is used to divide the trigger signal sent by the master controller into a plurality of parallel optical control signals corresponding to a plurality of controllable semiconductor switch tubes in the phase.

[0023] The present invention also discloses a large-capacity connector experimental detection device, which includes an experimental power supply, an experimental transformer and the large-capacity experimental multifunctional power supply processing device as described above, wherein the output end of the experimental power supply is electrically connected to the input end of the experimental transformer, the output end of the experimental transformer is electrically connected to the input end of the electric control valve group, and the output end of the electric control valve group is electrically connected to the experimental connector sample.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. Since the current valve control components in each electric control valve group corresponding to the three-phase electricity are composed of controllable semiconductor switch tubes, the current valve control components in each electric control valve group can be used for phase selection, closing or rectification by controlling the working state of the selection switch group and the connection switch group, that is, the phase selection, closing and rectification functions of the experimental power supply are integrated together, reducing the setting of the experimental circuit, improving the equipment utilization rate, and effectively saving the experimental cost;

[0026] 2. By electrically connecting multiple high-power controllable semiconductor switch tubes together, the power range that the electronically controlled valve group can handle is effectively guaranteed, thereby ensuring the needs of high-voltage, large-capacity AC and DC experimental circuits;

[0027] 3. Phase selection and closing is achieved by controlling the conduction and conduction angle of the controllable semiconductor switch tube. Compared with phase selection and closing through mechanical contact switches, it has the advantages of long service life and high phase selection and closing accuracy;

[0028] 4. Each group of electric control valve groups is equipped with an independent trigger controller and unlocking controller. At the same time, photoelectric isolation measures are taken to ensure that there is no electrical connection between the control devices of different phases, so that the control devices of different phases have certain electrical isolation and anti-interference performance, thereby accurately controlling the trigger angle of the controllable semiconductor switch tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 Schematic diagram of the system structure of a large-capacity connector experimental detection device in an embodiment of the present invention.

[0030] Figure 2 Schematic diagram of circuit connection between the electric control valve group and the conversion control switch group in an embodiment of the present invention.

[0031] Figure 3 For the general Figure 2Schematic diagram of circuit connection adjusted for phase selection and closing function.

[0032] Figure 4 For the general Figure 2 Schematic diagram of the circuit connection adjusted for rectification function.

[0033] Figure 5 Schematic diagram of the triggering principle of the thyristor in the embodiment of the present invention.

[0034] Figure 6 Schematic diagram of the connection structure between multiple thyristors in a thyristor group according to an embodiment of the present invention. DETAILED DESCRIPTION

[0035] In order to explain the technical content, structural features, achieved objectives and effects of the present invention in detail, the following is a detailed description in conjunction with the implementation methods and the accompanying drawings.

[0036] The present invention discloses a large-capacity connector test device, which refers to connection devices such as circuit breakers and fuses used in the field of three-phase power. The function of the test device is to judge the performance of the connector by applying high-voltage and large-capacity AC or DC test signals to the connector to be tested. Figure 1 As shown, the connector experimental detection device in this embodiment includes a large-capacity experimental power supply 1, an experimental transformer 2 and a power supply processing device 3. The output end of the experimental power supply 1 is electrically connected to the input end of the experimental transformer 2, the output end of the experimental transformer 2 is electrically connected to the input end of the power supply processing device 3, and the output end of the power supply processing device 3 is electrically connected to the experimental connector sample 4.

[0037] For details, please refer to Figure 1 and Figure 2 The power processing device 3 includes three electrically controlled valve groups 30 corresponding to three-phase electricity, a positive output terminal P, and a conversion control switch group KM. The three electrically controlled valve groups 30 in this embodiment are respectively a first valve group 30a, a second valve group 30b, and a third valve group 30c. The first valve group 30a is electrically connected to the A phase, the second valve group is electrically connected to the B phase, and the third valve group is electrically connected to the C phase.

[0038] Each electric control valve group 30 includes at least two groups of current valve control components VT, a phase electrical input terminal IN and a phase electrical output terminal OUT. For the first valve group 30a, its phase electrical input terminal IN is electrically connected to the output terminal Ua of the A phase electrical, for the second valve group 30b, its phase electrical input terminal IN is electrically connected to the output terminal Ub of the B phase electrical, and for the third valve group 30c, its phase electrical input terminal IN is electrically connected to the output terminal Uc of the C phase electrical. Each group of current valve control components VT includes a number of high-power controllable semiconductor switch tubes electrically connected together. At least two groups of current valve control components VT in any phase electric control valve group 30 are reversely connected in parallel between the phase electrical input terminal IN and the phase electrical output terminal OUT, such as the two groups of current valve control components VT1 and VT4 in the first valve group 30a, the two groups of current valve control components VT3 and VT6 in the second valve group 30b, and the two groups of current valve control components VT5 and VT2 in the third valve group 30c. The controllable semiconductor switch tube in this embodiment is preferably a thyristor, but not limited thereto, and may also be a power transistor GTR, an insulated gate bipolar transistor IGBT, etc. The current valve control component VT in the following embodiments is described by taking a thyristor group (VT1-VT6) as an example.

[0039] like Figure 2 , the conversion control switch group KM includes a selection switch group and a connection switch group. The selection switch group is used to selectively connect the thyristor group in each electric control valve group 30 to the positive output terminal P or the phase power output terminal OUT. The connection switch group is used to connect or disconnect the current path between the two electric control valve groups 30 connected to each other. When the power supply processing device 3 is used for the phase selection closing function, the current path between the electric control valve groups 30 is disconnected by the connection switch group, and the thyristor group in each electric control valve group 30 is connected between the phase power input terminal IN and the phase power output terminal OUT by the selection switch group, so as to perform the phase selection closing operation by controlling the conduction state of the thyristor group in each phase. When the power supply processing device 3 is used for the rectification function, the current path between the electric control valve groups 30 is connected by the connection switch group, and the thyristor group in each electric control valve group 30 is connected between the corresponding phase power input terminal IN and the positive output terminal P by the selection switch group, so that the electrical signal from each phase power input electric control valve group 30 can be full-wave rectified by two groups of thyristors to output direct current.

[0040] Furthermore, if Figure 2As shown, the selection switch group includes three selection switches K1a, K1b, K1c that are independent of each other and correspond to each electric control valve group 30 respectively. In this embodiment, each selection switch includes two single-pole single-throw switches. The connection switch group includes a first switch K2 electrically connected between the first valve group 30a and the second valve group 30b and a second switch K3 electrically connected between the second valve group 30b and the third valve group 30c. When the power processing device 3 is used for the rectification function, the first switch K2 and the second switch K3 are closed, and at the same time, the active ends of the selection switches K1a, K1b, K1c in the three electric control valve groups 30 are connected to the contact 1, forming a circuit as shown in FIG. Figure 4 The rectifier circuit shown in FIG. 1 is a rectifier circuit in which the thyristors in the thyristor group are turned on when the trigger angle is equal to 0°, which is equivalent to a diode. When the power supply processing device 3 is used for the phase selection and closing function, the first switch K2 and the second switch K3 are disconnected, and the active ends of the selection switches K1a, K1b, and K1c in the three electric control valve groups 30 are connected to the contact 2, forming a circuit as shown in FIG. Figure 3 The phase selection circuit shown in the figure, at this time, the thyristors in the thyristor group are used as AC three-phase closing switches. If one of the phases needs to be selected, such as phase A for closing, then it is only necessary to control the thyristor group in phase A to be turned on, and the thyristor groups in phases B and C to be turned off. If two of the phases need to be selected, such as phase A and phase B for closing, then it is only necessary to control the thyristor groups in phases A and B to be turned on, and the thyristor group in phase C to be turned off. If the three phases need to be turned on at the same time, then it is sufficient to control the thyristor groups in phases A, B and C to be turned on.

[0041] Therefore, through the setting of the power supply processing device 3 in the above embodiment, the thyristor group in each electric control valve group 30 can be used for three-phase AC phase selection and closing, and can also be used for rectification, converting high-voltage AC into high-voltage DC, that is, integrating the phase selection and closing and rectification functions of the experimental power supply 1 together, reducing the setting of the experimental circuit, improving the equipment utilization rate, and effectively saving the experimental cost. At the same time, by controlling the conduction of the thyristor and the size of the conduction angle to achieve phase selection and closing, compared with phase selection and closing through mechanical contact switches, it has the advantages of long service life and high phase selection and closing accuracy.

[0042] like Figure 6 As shown, in order to effectively ensure the tolerance capacity of the thyristor group, multiple thyristors are mixed together in a series-parallel manner, and at the same time, a RC absorption circuit is connected in parallel at both ends of each thyristor group to limit the voltage rise rate of the thyristor group, thereby preventing the thyristor from being turned on when there is no trigger signal. Specifically, the RC absorption circuit includes a capacitor C1 and a resistor R1 connected in series. In this embodiment, each thyristor group adopts a six-series and four-parallel structure, that is, it includes six series units L, and each series unit L includes four thyristors JB connected in parallel.

[0043] For further improvements, please refer to Figure 1 The power processing device 3 also includes a control device, which is connected to the thyristor group and the conversion control switch group KM in communication, and is used to control the working state of the thyristor group and the conversion control switch group KM, so as to facilitate the adjustment of the working state of the power processing device 3. Specifically, the control device includes a master controller 31 (CPU) and a signal acquisition device, a trigger control device 33 and a switch control device 34 connected to the master controller 31 in communication. The signal acquisition device is used to collect electrical signals from the input or output end of the electric control valve group 30. The trigger control device 33 is used to send a trigger signal to the thyristor group to control the working state of the thyristor group. The switch control device 34 is used to control the working state of different switches in the conversion control switch group KM. In this embodiment, the signal acquisition device includes a signal collector 320 (voltage or current transformer) and a signal processor 321. The signal collector 320 transmits the collected voltage or current signal to the signal processor 321, and the signal processor 321 sends the processed electrical signal to the main controller 31. The main controller 31 records the experimental waveform according to the electrical signal output by the signal processor 321, and detects the zero-crossing moment of the experimental waveform. That is, the signal acquisition device in this embodiment has the function of a synchronous signal generator. Please refer to Figure 5 The electrical signal sent by the signal acquisition device to the master controller 31 is used as the synchronization signal T0 for the master controller 31 to generate the control signal. The master controller 31 sends a trigger signal C0 with a specified conduction angle α to the thyristor group according to the synchronization signal T0, making the control more precise.

[0044] To avoid false triggering of the thyristor, Figure 1 and Figure 5 As shown, the control device also includes an unlocking control device 35 that is connected to the master controller 31 in communication, and the unlocking control device 35 is used to lock or release the thyristor group. The thyristor group can only perform a corresponding triggering action when it receives the unlocking signal J0 issued by the unlocking control device and the triggering signal C0 issued by the triggering control device 33 at the same time.

[0045] Further, the trigger control device 33 includes three independent trigger controllers 330 respectively connected to the master controller 31 in communication, and each trigger controller 330 corresponds to a group of electric-controlled valve groups 30. Similarly, the unlocking control device 35 includes three unlocking controllers 350 respectively connected to the master controller 31 in communication, and each unlocking controller 350 corresponds to a group of electric-controlled valve groups 30. In this embodiment, since the three-phase thyristor groups are independent of each other, and a trigger controller 330 and an unlocking controller 350 are separately configured for the thyristor group in each phase electric-controlled valve group 30, the electrical isolation performance and anti-interference performance between the control devices are improved, and it is convenient to control a certain phase electric-controlled valve group 30 separately.

[0046] For the thyristor group in each phase, the on and off of the large current is controlled by adopting a series-parallel mode of multiple groups of thyristors, so the consistency of the trigger signal for controlling the conduction of the thyristors is required to be high. In this regard, further improvement is made, each trigger controller 330 is respectively connected to the master controller 31 through a fiber optic splitter 331 for communication, and the fiber optic splitter 331 is used to divide the trigger signal sent by the master controller 31 into several parallel optical control signals corresponding to the several thyristors JB in the phase. In this embodiment, a digital pulse signal sent by the master controller 31 is transmitted to the fiber optic splitter 331, and then divided into several parallel optical signals to the trigger controller 330 through the fiber optic splitter 331. The trigger controller 330 triggers each thyristor JB in the thyristor group at the same time through the received several parallel optical signals, thereby achieving the consistency of trigger control by adjusting the width and duty cycle of the output pulse of the master controller 31, and avoiding the phenomenon of partial conduction of the thyristor JB during use. In addition, by providing the optical fiber splitter 331 , optical isolation is achieved between the trigger controller 330 and the master controller 31 , thereby preventing the signal from the thyristor from interfering with the master controller 31 .

[0047] To further illustrate the working principle of the power processing device 3, the following specifically describes the phase selection, closing and rectification process:

[0048] Phase selection and closing: Figure 2 , Figure 3 ,and Figure 5 First, the master controller 31 disconnects the first switch K2 and the second switch K3 through the switch control device 34, and at the same time connects the active ends of the selection switches K1a, K1b, and K1c in the three electric control valve groups 30 to the contact 2. Then, the master controller 31 sends a trigger signal C0 with the conduction angle α information to the optical fiber splitter 331 of the selected phase according to the synchronization signal T0 collected by the signal acquisition device, and sends an unlocking signal J0 to the unlocking controller 35 of the selected phase, and the thyristor valve group of the designated phase receives the rectangular unlocking pulse sent by the unlocking controller 35. The next cycle triggers the closing of the selected phase, and the conduction angle α can be adjusted within 0° to 180°. When two or three phases are selected at the same time for closing operation, the remaining selected phase thyristor valve groups automatically trigger the closing at the next zero crossing point after the first group of thyristor combination gates, and then the thyristors are always in a fully conductive state until the master controller 31 sends it a gate opening command or the control device loses power and other special circumstances.

[0049] Rectification: Figure 2 , Figure 4 ,and Figure 5The master controller 31 closes the first switch K2 and the second switch K3 through the switch control device 34, and at the same time connects the active ends of the selection switches K1a, K1b, and K1c in the three electric control valve groups 30 to the contact 1. After the master controller 31 sends a rectangular pulse (unlocking signal J0), the thyristor groups in the three phases are triggered to close when the three phases cross zero in the next cycle, thereby realizing the rectification function.

[0050] Furthermore, the conversion control switch group KM is the original element for executing the AC phase selection and closing and rectification function conversion. It is easy to generate electromagnetic interference signals during its state change process. Therefore, it is necessary to take necessary safety isolation measures for the switch control device 34, specifically: Figure 1 The switch control device 34 includes a driving component group 340 that drives the selection switch group and the connection switch group to move, and a solenoid valve group 341 that is connected to the driving component group 340. The solenoid valve group 341 is used to control the movement of the driving component group 340. The solenoid valve group 341 is connected to the master controller 31. In this embodiment, the driving component group 340 includes a plurality of driving components connected to each switch, and the solenoid valve group 341 includes a plurality of solenoid valves connected to each driving component. The master controller 31 transmits a control signal to the solenoid valve, and the solenoid valve controls the driving component to make a corresponding action, thereby isolating the direct actuator (driving component) from the master controller 31 through the solenoid valve. More specifically, the driving component is preferably a cylinder.

[0051] In addition, to facilitate input of control commands to the master controller 31 , a host computer 5 and a display device 6 that are communicatively connected to the master controller 31 may be provided, control commands may be input to the master controller 31 via the host computer 5 , and experimental parameters may be displayed via the display device 6 .

[0052] It should also be noted that in order to avoid interference of power devices on control devices, in the above control circuit, optical fiber communication is preferably used between the main controller 31 and the signal acquisition device, the optical fiber splitter 331, the unlocking controller 350, the host computer 5 and the solenoid valve group 341.

[0053] In summary, through the large-capacity connector test detection device disclosed in the above embodiment, the main controller 31 can send a command to convert each switch state to the conversion control switch group KM to adjust the function of the power supply processing device 3, even if it works in the phase selection closing state or the rectification state, so that the connector sample 4 can be subjected to high-voltage and large-capacity AC and DC experiments without changing the experimental site and experimental equipment, thereby effectively saving the experimental cost. Secondly, when used for DC experiments, DC power is directly obtained by rectifying and transforming high-voltage and large-capacity AC power, thereby solving the problem of using AC experiments to simulate DC experiments due to insufficient DC experimental capacity. In addition, through the application of the thyristor group, the accuracy and repeatability of the phase selection of the closing phase selection switch during AC experiments are also solved.

[0054] The above disclosure is only the preferred embodiment of the present invention, which certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the scope of the patent application of the present invention are still within the scope covered by the present invention.

Claims

1. A multifunctional power supply processing device for large-capacity experiments, characterized in that: include: Three electrically controlled valve groups corresponding to three-phase electricity respectively, each of the electrically controlled valve groups comprises at least two groups of current valve control components, a phase electricity input terminal and a phase electricity output terminal, each group of the current valve control components comprises a number of high-power controllable semiconductor switch tubes electrically connected together; at least two groups of the current valve control components in any phase of the electrically controlled valve group are reversely connected in parallel between the phase electricity input terminal and the phase electricity output terminal; Positive output terminal; A conversion control switch group, which includes a selection switch group and a connection switch group; The selection switch group is used to selectively connect the current valve control component in each of the electric control valve groups to the positive output terminal or the phase power output terminal; The connecting switch group is used to connect or disconnect the current path between the two electrically controlled valve groups connected to each other; By controlling the working states of the selection switch group and the connection switch group, the current valve control component in each electric control valve group can be used for phase selection, closing or rectification; The controllable semiconductor switch tube is a thyristor; A control device is communicatively connected with the current valve control component and the conversion control switch group, and is used to control the working state of the current valve control component and the conversion control switch group.

2. The multifunctional power supply processing device for large-capacity experiments according to claim 1 is characterized in that: The controllable semiconductor switch tubes in each group of the current valve control components are mixed together in series and parallel, and a resistance-capacitance absorption circuit is connected in parallel at both ends of the controllable semiconductor switch tubes in each group to limit the voltage rise rate of the controllable semiconductor switch tubes.

3. The multifunctional power supply processing device for large-capacity experiments according to claim 1 is characterized in that: The electrically controlled valve group includes a first valve group, a second valve group and a third valve group, and the connecting switch group includes a first switch electrically connected between the first valve group and the second valve group and a second switch electrically connected between the second valve group and the third valve group.

4. The multifunctional power supply processing device for large-capacity experiments according to claim 1 is characterized in that: The control device includes a master controller and a signal acquisition device, a trigger control device and a switch control device which are connected to the master controller in communication; the signal acquisition device is used to acquire the electrical signal at the input or output end of the electric control valve group; The trigger control device is used to send a trigger signal to the current valve control component to control the working state of the current valve control component; the switch control device is used to control the working states of different switches in the conversion control switch group.

5. The multifunctional power supply processing device for large-capacity experiments according to claim 4 is characterized in that: The control device further comprises an unlocking control device which is in communication with the master controller, and the unlocking control device is used to lock or release the current valve control component.

6. The multifunctional power supply processing device for large-capacity experiments according to claim 4 is characterized in that: The trigger control device includes three independent trigger controllers respectively connected to the master controller for communication, and each of the trigger controllers corresponds to a group of the electric-controlled valve groups.

7. The multifunctional power supply processing device for large-capacity experiments according to claim 6 is characterized in that: Each of the trigger controllers is communicatively connected to the master controller via an optical fiber splitter, and the optical fiber splitter is used to divide the trigger signal sent by the master controller into a plurality of parallel optical control signals corresponding to a plurality of controllable semiconductor switch tubes of the phase.

8. A large-capacity connector experimental detection device, characterized in that: It comprises an experimental power supply, an experimental transformer and a large-capacity experimental multifunctional power supply processing device as described in any one of claims 1 to 7, wherein the output end of the experimental power supply is electrically connected to the input end of the experimental transformer, the output end of the experimental transformer is electrically connected to the input end of the electric control valve group, and the output end of the electric control valve group is electrically connected to the experimental connector sample.

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