Confluence testing device and method for active sample to be tested

Abstract

The invention provides a confluence test device for an active sample to be tested. An alternating current input unit is electrically connected with a test assembly and a busbar assembly; the DC input unit is electrically connected with the test assembly and the busbar assembly. When the test is carried out and the active sample to be tested outputs alternating current, the active sample to be tested is electrically connected with the alternating current input unit; the test current of the active sample to be tested is transmitted from the AC input unit to the test assembly and the output interface of the busbar assembly. When the test is carried out and the active sample to be tested outputs direct current, the active sample to be tested is electrically connected with the direct current input unit; the test current of the active sample to be tested is transmitted from the DC input unit to the test assembly and the output interface of the busbar assembly. The technical problems that an existing testing device increases a large amount of repeated labor cost and is low in testing efficiency are solved.

Description

Technical Field

[0001] The present application relates to the field of power supply testing, and in particular to a current sink testing device and method for active samples to be tested. Background Art

[0002] When testing a photovoltaic inverter, it is necessary to connect the photovoltaic inverter to an active network with a simulated power supply, which is divided into an AC simulated power supply and a DC simulated power supply. Due to the different specifications and test standards of photovoltaic inverters, the existing test equipment needs to repeatedly build a test platform to test these photovoltaic inverters individually and one by one, which undoubtedly increases a lot of repeated labor costs and has low test efficiency. Summary of the invention

[0003] In view of the above problems, the present application is proposed to provide a current sink testing device and method for active samples to be tested that overcomes the above problems or at least partially solves the above problems, including: A busbar test device for an active sample to be tested, the device comprising: a busbar assembly, a test assembly and a busbar assembly; the busbar assembly comprises: an AC input unit and a DC input unit; the busbar assembly comprises a plurality of output interfaces corresponding to different current values; The AC input unit is electrically connected to the test assembly and the busbar assembly; the DC input unit is electrically connected to the test assembly and the busbar assembly; When the test is performed and the active sample to be tested outputs AC power, the active sample to be tested is electrically connected to the AC input unit; the test current of the active sample to be tested is transmitted from the AC input unit to the test component and the output interface of the busbar component; When testing is performed and the active sample to be tested outputs direct current, the active sample to be tested is electrically connected to the direct current input unit; the test current of the active sample to be tested is transmitted from the direct current input unit to the test component and the output interface of the busbar component.

[0004] Further, the input interface of the AC input unit includes: interface A1, interface B1, interface C1 and interface N1; the output interface of the busbar component includes: busbar port A, busbar port B, busbar port C and busbar port N; the test component includes three groups of AC voltage test units and three groups of AC current test units; The interface A1 is electrically connected to the first AC current test unit and the busbar port A; the interface B1 is electrically connected to the second AC current test unit and the busbar port B; the interface C1 is electrically connected to the third AC current test unit and the busbar port C; the interface N1 is electrically connected to the busbar port N; The first AC voltage testing unit is electrically connected to the interface A1 and the interface N1; the second AC voltage testing unit is electrically connected to the interface B1 and the interface N1; and the third AC voltage testing unit is electrically connected to the interface C1 and the interface N1.

[0005] Furthermore, the AC input unit includes at least two groups; the active samples to be tested include at least two groups; When the test is performed and the active samples to be tested output alternating current, at least two groups of the active samples to be tested are connected to at least two groups of the alternating current input units in a one-to-one correspondence.

[0006] Further, the input interface of the DC input unit includes: a positive electrode interface and a negative electrode interface; the output interface of the busbar assembly includes: a positive busbar port and a negative busbar port; the test assembly includes a DC voltage test unit and a DC current test unit; The positive electrode interface is electrically connected to the DC current test unit and the positive electrode busbar port; the negative electrode interface is electrically connected to the negative electrode busbar port; The DC voltage testing unit is electrically connected to the positive electrode interface and the negative electrode interface.

[0007] Furthermore, the DC input unit includes at least two groups; the active samples to be tested include at least two groups; When the test is performed and the active samples to be tested output direct current, at least two groups of the active samples to be tested are connected to at least two groups of the direct current input units in a one-to-one correspondence.

[0008] Furthermore, the output interface of the busbar assembly is provided with three jacks, and the current values ​​corresponding to the three jacks are 100A, 200A and 300A respectively.

[0009] A current collector box for testing active samples to be tested, the current collector box comprising: a box body, and a device as described in any embodiment of the present application; The active sample to be tested and the test component are both connected to the busbar component via the plug-in panel of the box; the busbar component is arranged inside the box.

[0010] Furthermore, the plug-in panel of the box is provided with a plug-in quick-connect terminal for connecting the active sample to be tested, and a banana plug for connecting the test assembly; The plug-in quick-connect terminal is arranged at the lower part of the side surface of the box body; the banana plug is arranged at the upper part of the side surface of the box body; and the busbar assembly is arranged at the upper part inside the box body.

[0011] Furthermore, four universal wheels are provided at the bottom of the box.

[0012] A method for testing a current sink of an active sample to be tested, the method being implemented by a device as described in any embodiment of the present application; The method comprises: Setting the output mode of the active sample to be tested; Determine the AC input unit and / or the DC input unit to be connected according to the output mode of the active sample to be tested, and connect the wires accordingly; Starting the active sample to be tested to output current; After the output current of the active sample to be tested is stabilized, the test result displayed by the test component is recorded.

[0013] This application has the following advantages: In the embodiments of the present application, in view of the fact that existing test devices have increased a lot of repeated labor costs and have low test efficiency, the present application provides a solution for converging the test current of the active sample to be tested to the output interface of the converging component, the test component and the busbar component, specifically: a converging test device for active samples to be tested, the device comprising: a converging component, a test component and a busbar component; the converging component comprises: an AC input unit and a DC input unit; the busbar component comprises a plurality of output interfaces corresponding to different current values; the AC input unit is connected to the test component and the busbar component The busbar assembly is electrically connected; the DC input unit is electrically connected to the test assembly and the busbar assembly; when the test is performed and the active sample to be tested outputs AC power, the active sample to be tested is electrically connected to the AC input unit; the test current of the active sample to be tested is transmitted from the AC input unit to the test assembly and the output interface of the busbar assembly; when the test is performed and the active sample to be tested outputs DC power, the active sample to be tested is electrically connected to the DC input unit; the test current of the active sample to be tested is transmitted from the DC input unit to the test assembly and the output interface of the busbar assembly. The present application solves the technical problems that the existing test devices increase a large amount of repeated labor costs and have low test efficiency, and achieves the technical effect of satisfying both the access test of a single device and the simultaneous access test of multiple devices without the need to repeatedly build a test platform. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solution of the present application, the drawings required for use in the description of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0015] Figure 1It is a first frame schematic diagram of a current confluence testing device for active samples to be tested provided by an embodiment of the present application; Figure 2 It is a second frame schematic diagram of a confluence testing device for active samples to be tested provided by an embodiment of the present application; Figure 3 It is a schematic diagram of the circuit structure of the AC power supply test part in one embodiment of the present application; Figure 4 Schematic diagram of the circuit structure of the DC power supply test part in one embodiment of the present application; Figure 5 It is a structural schematic diagram of a current collector box for testing active samples provided by an embodiment of the present application; Figure 6 This is a schematic diagram of the structure inside the rear door of the junction box in one embodiment of the present application; Figure 7 It is a schematic diagram of the circuit structure of the active network used in the test in one embodiment of the present application. DETAILED DESCRIPTION

[0016] In order to make the objects, features and advantages of the present application more obvious and understandable, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. Obviously, the described embodiments are 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.

[0017] The inventors analyzed the prior art and found that the existing testing devices increased a lot of repetitive labor costs and had low testing efficiency because the existing testing devices usually only allow a single analog power supply device to be connected to the testing device, and there is no related testing equipment that can simultaneously meet multiple standard testing requirements.

[0018] Based on the above-mentioned inventors' systematic analysis of the prior art, one of the core technical concepts of the present application is that a large current input and a current convergence output for testing active samples can be achieved through a current convergence device, so that the test requirements of multiple different standards can be achieved through the current convergence device, which can meet the access test of a single device and the simultaneous access test of multiple devices. Even if the test samples are different, there is no need to repeatedly build a test platform.

[0019] Reference Figure 1-2 , shows a busbar test device for an active sample to be tested provided by an embodiment of the present application, the device comprising: a busbar assembly, a test assembly and a busbar assembly; the busbar assembly comprises: an AC input unit and a DC input unit; the busbar assembly comprises a plurality of output interfaces corresponding to different current values; The AC input unit is electrically connected to the test assembly and the busbar assembly; the DC input unit is electrically connected to the test assembly and the busbar assembly; When the test is performed and the active sample to be tested outputs AC power, the active sample to be tested is electrically connected to the AC input unit; the test current of the active sample to be tested is transmitted from the AC input unit to the test component and the output interface of the busbar component; When testing is performed and the active sample to be tested outputs direct current, the active sample to be tested is electrically connected to the direct current input unit; the test current of the active sample to be tested is transmitted from the direct current input unit to the test component and the output interface of the busbar component.

[0020] In the embodiments of the present application, in view of the fact that existing test devices have increased a lot of repeated labor costs and have low test efficiency, the present application provides a solution for converging the test current of the active sample to be tested to the output interface of the converging component, the test component and the busbar component, specifically: a converging test device for active samples to be tested, the device comprising: a converging component, a test component and a busbar component; the converging component comprises: an AC input unit and a DC input unit; the busbar component comprises a plurality of output interfaces corresponding to different current values; the AC input unit is connected to the test component and the busbar component The busbar assembly is electrically connected; the DC input unit is electrically connected to the test assembly and the busbar assembly; when the test is performed and the active sample to be tested outputs AC power, the active sample to be tested is electrically connected to the AC input unit; the test current of the active sample to be tested is transmitted from the AC input unit to the test assembly and the output interface of the busbar assembly; when the test is performed and the active sample to be tested outputs DC power, the active sample to be tested is electrically connected to the DC input unit; the test current of the active sample to be tested is transmitted from the DC input unit to the test assembly and the output interface of the busbar assembly. The present application solves the technical problems that the existing test devices increase a large amount of repeated labor costs and have low test efficiency, and achieves the technical effect of satisfying both the access test of a single device and the simultaneous access test of multiple devices without the need to repeatedly build a test platform.

[0021] Next, a current sink testing device for an active sample to be tested in this exemplary embodiment will be further described.

[0022] It should be noted that the active sample to be tested may include a photovoltaic inverter, an AC source and a DC source. The active sample to be tested as a whole can be used as the input of the busbar component, and the photovoltaic inverter therein can be tested. The output mode of the active sample to be tested may include an AC source mode, a load mode, a DC source mode, a photovoltaic simulator mode and / or a battery mode; the busbar component may be applicable to different test standards (such as IEC / EN standards and UL / CSA standards) to meet the access of samples with different powers (not more than 150kW); the test component may be a power meter, which is used to collect voltage and current signals. The sampled current in the loop can be converted into a low-voltage signal through an inductor to improve safety; the busbar component is used as the output of the busbar component.

[0023] It should be understood that the inverter in the active sample to be tested is the object to be tested by the busbar test device, and the busbar component can be used to parallel and busbar the outputs of the modular AC and DC sources in the active sample to be tested.

[0024] As an example, the active network used by the active sample to be tested can be as follows: Figure 7 In the active sample to be tested, the AC source (160K) can be formed by connecting 8 20K AC modules in parallel, and the DC source (150K) can be formed by connecting 5 30K DC modules in parallel. The confluence component is used for confluence of multiple AC sources and multiple DC sources.

[0025] In one embodiment of the present application, refer to Figure 3 , the input interface of the AC input unit includes: interface A1, interface B1, interface C1 and interface N1; the output interface of the busbar component includes: busbar port A, busbar port B, busbar port C and busbar port N; the test component includes three groups of AC voltage test units and three groups of AC current test units; The interface A1 is electrically connected to the first AC current test unit and the busbar port A; the interface B1 is electrically connected to the second AC current test unit and the busbar port B; the interface C1 is electrically connected to the third AC current test unit and the busbar port C; the interface N1 is electrically connected to the busbar port N; The first AC voltage testing unit is electrically connected to the interface A1 and the interface N1; the second AC voltage testing unit is electrically connected to the interface B1 and the interface N1; and the third AC voltage testing unit is electrically connected to the interface C1 and the interface N1.

[0026] It should be noted that the branches where the interface A1, the interface B1 and the interface C1 are located can correspond to the energized branches, and the branch where the interface N1 is located can correspond to the neutral line branch that is generally not energized; the AC voltage testing unit is connected in parallel between the energized branch and the neutral line branch; the AC current testing unit is respectively arranged in each energized branch, and the current of each branch is sampled through inductance.

[0027] In one embodiment of the present application, refer to Figure 3 , the AC input unit includes at least two groups; the active samples to be tested include at least two groups; When the test is performed and the active samples to be tested output alternating current, at least two groups of the active samples to be tested are connected to at least two groups of the alternating current input units in a one-to-one correspondence.

[0028] It should be noted that, when at least two groups of active samples to be tested are correspondingly connected to the AC input unit, the testing component can test the at least two groups of active samples to be tested simultaneously.

[0029] As an example, see Figure 3 and Figure 5 , the AC input unit may include 8 groups, namely: AC input interface ACS1, AC input interface ACS2, AC input interface ACS3, AC input interface ACS4, AC input interface ACS5, AC input interface ACS6, AC input interface ACS7 and AC input interface ACS8; The input interface of the AC input unit may include: interface A1 to interface A8, interface B1 to interface B8, interface C1 to interface C8, and interface N1 to interface N8; Among them, interfaces with the same name are electrically connected, specifically: interface A1 to interface A8 are electrically connected, interface B1 to interface B8 are electrically connected, interface C1 to interface C8 are electrically connected, and interface N1 to interface N8 are electrically connected.

[0030] In one embodiment of the present application, refer to Figure 4 , the input interface of the DC input unit includes: a positive electrode interface and a negative electrode interface; the output interface of the busbar assembly includes: a positive busbar port and a negative busbar port; the test assembly includes a DC voltage test unit and a DC current test unit; The positive electrode interface is electrically connected to the DC current test unit and the positive electrode busbar port; the negative electrode interface is electrically connected to the negative electrode busbar port; The DC voltage testing unit is electrically connected to the positive electrode interface and the negative electrode interface.

[0031] It should be noted that the DC voltage test unit can be connected in parallel between the positive branch and the negative branch; the DC current test unit can be set in the positive branch and sample the current of the branch through an inductor.

[0032] In one embodiment of the present application, refer to Figure 4 , the DC input unit includes at least two groups; the active samples to be tested include at least two groups; When the test is performed and the active samples to be tested output direct current, at least two groups of the active samples to be tested are connected to at least two groups of the direct current input units in a one-to-one correspondence.

[0033] It should be noted that, when at least two groups of active samples to be tested are correspondingly connected to the DC input unit, the testing component can test the at least two groups of active samples to be tested simultaneously.

[0034] As an example, see Figure 4 and Figure 5 The DC input unit may include 5 groups, namely, DC input interface PV1, DC input interface PV2, DC input interface PV3, DC input interface PV4 and DC input interface PV5; wherein each DC input interface includes positive and negative poles, and interfaces with the same polarity are electrically connected, specifically: the positive poles of the DC input interfaces PV1~PV5 are electrically connected, and the negative poles of the DC input interfaces PV1~PV5 are electrically connected.

[0035] In a specific embodiment of the present application, when a plurality of active samples to be tested are correspondingly connected to the DC input unit and the AC input unit at the same time, the test component can test the plurality of active samples to be tested at the same time.

[0036] In one embodiment of the present application, refer to Figure 6 The output interface of the busbar assembly is provided with three jacks, and the current values ​​corresponding to the three jacks are 100A, 200A and 300A respectively.

[0037] It should be noted that the busbar assembly may include a plurality of copper bars, each of which is arranged side by side, and the copper bars are provided with the three sockets, and the three sockets of each copper bar are arranged in a stepped staggered manner to facilitate wiring. The apertures of the three sockets may be of different sizes, and different wire diameters may be selected according to different current sizes when wiring the three sockets, and the wiring may be directly performed by using a screw crimping method with a nut.

[0038] It should be understood that Figure 3-4 The output terminal on the middle copper busbar (same branch) and Figure 6 The three sockets of a single busbar correspond to each other; Figure 5 The banana plug in the interface corresponds to the test component; Figure 5 The interface corresponding to the quick plug in the connector corresponds to the confluence assembly.

[0039] The above is a description of an embodiment of a current confluence testing device for active samples to be tested of the present application. For other embodiments, since these embodiments are basically similar to the embodiments of the above-mentioned device, the description is relatively simple. For relevant matters, please refer to the partial description of the embodiments of the above-mentioned device.

[0040] Reference Figure 5-6 , shows a current collector box for testing active samples provided by an embodiment of the present application, the current collector box comprising: a box body, and a device as described in any embodiment of the present application; The active sample to be tested and the test component are both connected to the busbar component via the plug-in panel of the box; the busbar component is arranged inside the box.

[0041] It should be noted that the box may be in a rectangular shape, and the dimensions may be: bottom length 600mm, bottom width 600mm, height 1000mm. The busbar assembly may be specifically arranged in the rear door of the box and near the top of the box for wiring.

[0042] In one embodiment of the present application, refer to Figure 5-6 The plug-in panel of the box body is provided with a plug-in quick-connect terminal for connecting the active sample to be tested, and a banana plug for connecting the test assembly; The plug-in quick-connect terminal is arranged at the lower part of the side surface of the box body; the banana plug is arranged at the upper part of the side surface of the box body; and the busbar assembly is arranged at the upper part inside the box body.

[0043] It should be noted that the banana plug is a plug that is easy to insert, has a large and firm contact surface, and is suitable for the acquisition of small current AC and DC voltage signals; the plug-in quick-connect terminal is mainly suitable for high voltage and high current scenarios, has the characteristics of quick plugging and unplugging, the plug-in and unplugging process is simple and easy to operate, and the connection is stable and durable; the active sample to be tested may also use a plug-in quick-connect terminal, and the active sample to be tested can be quickly connected to the plug-in panel of the box, which improves the test efficiency while meeting the power safety requirements.

[0044] It should be understood that Figure 3 The purpose of "not installing a meter, connecting to the banana plug on the panel" is to uniformly transmit the sampling signal to Figure 5 After the plug-in panel of the box is installed, it is connected to the test component (power meter) to improve the uniformity of test data acquisition rate and time, reduce test uncertainty, and improve test accuracy.

[0045] In one embodiment of the present application, refer to Figure 5 The bottom of the box is provided with 4 universal wheels.

[0046] It should be noted that the four universal wheels can be respectively arranged at the four corners of the bottom of the box, and the position of the box can be adjusted by the universal wheels when wiring or deploying a test environment.

[0047] An embodiment of the present application provides a method for testing a current sink for an active sample to be tested, the method being implemented by a device as described in any embodiment of the present application; The method comprises: Setting the output mode of the active sample to be tested; Determine the AC input unit and / or the DC input unit to be connected according to the output mode of the active sample to be tested, and connect the wires accordingly; Starting the active sample to be tested to output current; After the output current of the active sample to be tested is stabilized, the test result displayed by the test component is recorded.

[0048] It should be noted that, according to the requirements of the corresponding test standards, the test results may include parameters such as voltage, current, frequency and power.

[0049] In a specific embodiment of the present application, the method may specifically include the following steps: According to the capacity of the sample to be tested, select the number of AC and DC sources to be connected and set the AC and DC source output mode; Connect the pre-made connection wires to the combiner cabinet and the AC / DC source; Select a power cord with a suitable diameter to connect the combiner cabinet and the sample to be tested; Use a signal line to connect the output signal of the combiner cabinet and the power meter acquisition port; Start the test; After the output of the sample under test becomes stable, record the input and output parameters of the sample under test.

[0050] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the embodiments of the present application.

[0051] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or terminal device 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, article or terminal device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or terminal device including the elements.

[0052] The above is a detailed introduction to a confluence testing device and method for active samples to be tested provided by the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea; at the same time, for technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A current confluence testing device for active samples to be tested, characterized in that: The device comprises: a busbar assembly, a test assembly and a busbar assembly; the busbar assembly comprises: an AC input unit and a DC input unit; the busbar assembly comprises a plurality of output interfaces corresponding to different current values; The AC input unit is electrically connected to the test assembly and the busbar assembly; the DC input unit is electrically connected to the test assembly and the busbar assembly; When the test is performed and the active sample to be tested outputs AC power, the active sample to be tested is electrically connected to the AC input unit; the test current of the active sample to be tested is transmitted from the AC input unit to the test component and the output interface of the busbar component; When testing is performed and the active sample to be tested outputs direct current, the active sample to be tested is electrically connected to the direct current input unit; the test current of the active sample to be tested is transmitted from the direct current input unit to the test component and the output interface of the busbar component.

2. The device according to claim 1, characterized in that The input interface of the AC input unit includes: interface A1, interface B1, interface C1 and interface N1; the output interface of the busbar assembly includes: busbar port A, busbar port B, busbar port C and busbar port N; the test assembly includes three groups of AC voltage test units and three groups of AC current test units; The interface A1 is electrically connected to the first AC current test unit and the busbar port A; the interface B1 is electrically connected to the second AC current test unit and the busbar port B; the interface C1 is electrically connected to the third AC current test unit and the busbar port C; the interface N1 is electrically connected to the busbar port N; The first AC voltage testing unit is electrically connected to the interface A1 and the interface N1; the second AC voltage testing unit is electrically connected to the interface B1 and the interface N1; and the third AC voltage testing unit is electrically connected to the interface C1 and the interface N1.

3. The device according to claim 2, characterized in that The AC input unit includes at least two groups; the active samples to be tested include at least two groups; When the test is performed and the active samples to be tested output alternating current, at least two groups of the active samples to be tested are connected to at least two groups of the alternating current input units in a one-to-one correspondence.

4. The device according to claim 1, characterized in that The input interface of the DC input unit includes: a positive electrode interface and a negative electrode interface; the output interface of the busbar assembly includes: a positive busbar port and a negative busbar port; the test assembly includes a DC voltage test unit and a DC current test unit; The positive electrode interface is electrically connected to the DC current test unit and the positive electrode busbar port; the negative electrode interface is electrically connected to the negative electrode busbar port; The DC voltage testing unit is electrically connected to the positive electrode interface and the negative electrode interface.

5. The device according to claim 4, characterized in that The DC input unit includes at least two groups; the active samples to be tested include at least two groups; When the test is performed and the active samples to be tested output direct current, at least two groups of the active samples to be tested are connected to at least two groups of the direct current input units in a one-to-one correspondence.

6. The device according to claim 1, characterized in that The output interface of the busbar assembly is provided with three jacks, and the current values ​​corresponding to the three jacks are 100A, 200A and 300A respectively.

7. A busbar box for testing active samples, characterized in that: The busbar box comprises: a box body, and a device as claimed in any one of claims 1 to 6; The active sample to be tested and the test component are both connected to the busbar component via the plug-in panel of the box; the busbar component is arranged inside the box.

8. The junction box according to claim 7, characterized in that: The plug-in panel of the box body is provided with a plug-in quick-connect terminal for connecting the active sample to be tested, and a banana plug for connecting the test assembly; The plug-in quick-connect terminal is arranged at the lower part of the side surface of the box body; the banana plug is arranged at the upper part of the side surface of the box body; and the busbar assembly is arranged at the upper part inside the box body.

9. The junction box according to claim 7, characterized in that: The bottom of the box is provided with four universal wheels.

10. A method for testing the current flow of an active sample to be tested, characterized in that: The method is implemented by a device as described in any one of claims 1 to 6; The method comprises: Setting the output mode of the active sample to be tested; Determine the AC input unit and / or the DC input unit to be connected according to the output mode of the active sample to be tested, and connect the wires accordingly; Starting the active sample to be tested to output current; After the output current of the active sample to be tested is stabilized, the test result displayed by the test component is recorded.

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