A portable DC test box

Abstract

The present invention relates to a portable DC test box for on-site testing of a DC panel's power module, insulation monitoring unit, AC monitoring unit, battery inspection unit, and DC monitoring unit. A plurality of patch panels and terminal blocks provide ports and wiring for connecting the DC panel's unit modules to other devices within the test box. A PLC controls the DC panel, and various meters detect the current and / or voltage of the unit modules, displaying the unit module's operating status on a human-machine interface. The three-phase input is divided into two paths, one connected to the primary of an isolation transformer and the other connected to an external aviation plug to supply the DC panel's power module. After the isolation transformer performs AC voltage level conversion, the secondary output is supplied to a switching power supply, a PLC, and a multi-function meter. After the switching power supply performs AC / DC conversion, the human-machine interface and an ammeter are supplied. The present invention tests the electrical characteristics, communication status, and fault conditions of various modules of the DC panel, effectively improving maintenance efficiency and saving costs.

Description

Technical Field

[0001] The present invention relates to a portable DC test box, which is suitable for testing a power module K2B10L, an insulation monitoring unit PM2J, an AC monitoring unit PM2A, a battery inspection unit PM2B, and a DC monitoring unit PM2D of a GZDW-6 DC panel. Background Art

[0002] As the first line of defense for DC power supply in urban rail transit, the GZDW-6 DC panel is safe, reliable and has stable performance, playing a vital role in the operational safety of metro rail transit.

[0003] For example, the GZDW-6 DC panel has been in operation for decades in the Shanghai Metro rail transit system. Due to its heavy usage, long service life, and high frequency of use, failures of some GZDW-6 DC panel modules are inevitable. Currently, maintenance and testing of the GZDW-6 DC panel modules are primarily performed offline. For troubleshooting of the power module K2B10L, insulation monitoring unit PM2J, AC monitoring unit PM2A, and battery inspection unit PM2B, line personnel replace the suspected faulty module with a spare and transport it to the maintenance workshop. After the workshop staff determines the fault and completes the repair, the module is returned to service. If the fault is not fully repaired, it must be returned for repair. This entire process consumes a considerable amount of time and effort.

[0004] In order to improve the fault inspection and maintenance of each module of the GZDW-6 DC screen and improve the efficiency of the fault inspection and maintenance of the GZDW-6 DC screen, it is urgent to build a portable DC test box to solve the blind spot of on-site detection and offline monitoring of each module of the GZDW-6 DC screen, open up the technical gap, and provide a new testing method for front-line operation and maintenance and studio offline repair. Summary of the Invention

[0005] To solve the above problems, the present invention provides a portable DC test box, which is suitable for on-site testing of the power module K2B10L, insulation monitoring unit PM2J, AC monitoring unit PM2A, battery inspection unit PM2B, and DC monitoring unit PM2D of the GZDW-6 DC panel, thereby improving the efficiency of fault repair.

[0006] In order to solve the above problems, the technical solution of the present invention is to provide a portable DC test box, which is used for on-site testing of DC panels. The portable box is equipped with:

[0007] Test base, for the corresponding insertion of multiple unit modules of the DC panel to be tested;

[0008] Several patch panels and terminal blocks provide ports and wiring to connect the unit modules of the DC panel with the following components of the test box;

[0009] PLC, controls the DC panel;

[0010] A test meter used to collect current and / or voltage of the unit module;

[0011] Human-computer interaction interface, used to display the working status of the unit module;

[0012] Isolation transformer, used for AC voltage level conversion;

[0013] Switching power supply, used for AC / DC voltage conversion;

[0014] The first AC voltage input to the test box is connected to the primary of the isolation transformer and also supplies the DC panel; the isolation transformer converts the first AC voltage into a second AC voltage, which is supplied to the switching power supply, PLC and some test meters through the secondary of the isolation transformer; the switching power supply converts the second AC voltage into a DC voltage, which is supplied to the human-computer interaction interface and another part of the test meters.

[0015] Optionally, the DC panel is a GWDZ-6 DC panel;

[0016] The unit modules to be tested include: power module K2B10L, insulation monitoring unit PM2J, AC monitoring unit PM2A, battery inspection unit PM2B, and DC monitoring unit PM2D.

[0017] Optionally, a first aviation plug XS3 connected to an external AC380V power supply is connected to ports X0-1, X0-2, and X0-3 of the terminal block X0 through a first 3P switch K1;

[0018] Port X0-1 of terminal block X0 is connected to ports X0-10, X0-11, and X0-12; port X0-2 is connected to ports X0-7, X0-8, and X0-9; and port X0-3 is connected to ports X0-4, X0-5, and X0-6.

[0019] The three-phase AC380V input is divided into three paths for supply to the lower level through terminal block X0:

[0020] The first path is connected to the primary of the isolation transformer through ports X0-4, X0-7, and X0-10 of terminal block X0;

[0021] The second path is connected to the second 3P switch K2 through ports X0-5, X0-8, and X0-11 of the terminal block X0, and is then connected to the second aviation plug XS4 that supplies power to the power module K2B10L through the second 3P switch K2;

[0022] The third path is connected to ports XS1-1, XS1-2, and XS1-3 of the first patch panel XS1 through ports X0-6, X0-9, and X0-12 of the terminal block X0, and is used to provide monitoring signals for the AC monitoring unit PM2A.

[0023] Optionally, the isolation transformer converts the AC380V input from the primary into AC220V and outputs it from the secondary. The AC220V is then connected to ports X0-13 and X0-14 of terminal block X0. Port X0-13 is then connected to ports X0-17 and X0-18, and port X0-14 is then connected to ports X0-15 and X0-16, thus dividing the AC220V into two paths and supplying them to the lower level.

[0024] One way is through the ports X0-16 and X0-18 of the terminal block X0 to provide working power to the PLC and connect to the input of the switching power supply;

[0025] The other route supplies power to the multi-function meter through ports X0-15 and X0-17 of the terminal block X0, and is connected to ports XS1-5 and XS1-6 of the first connector XS1 to power the insulation monitoring unit PM2J, or the AC monitoring unit PM2A, or the battery inspection unit PM2B being tested; the multi-function meter is used to detect the voltage and current of each unit module.

[0026] Optionally, when detecting the AC monitoring unit PM2A, the AC monitoring unit PM2A is supplied with an AC220V working power supply through the ports XS1-5 and XS1-6 of the first patch panel XS1;

[0027] The AC monitoring unit PM2A receives the AC380V AC monitoring signal from ports XS1-1, XS1-2, and XS1-3 of the first connector XS1; the signal output by the AC monitoring unit PM2A is transmitted to the PLC in the form of a 485 signal, and the PLC communicates with the human-machine interface to display the working status of the AC monitoring unit PM2A.

[0028] Optionally, the second aviation plug XS4 is connected to the power module K2B10L of the DC panel to provide it with AC380V working power; when the power module K2B10L is working normally, the output DC220V is sent back to the test box through the second aviation plug XS4, and the DC220V is connected to ports X0-19 and X0-20 of the terminal block X0, port X0-19 is connected to port X0-21, port X0-20 is connected to port X0-22, and ports X0-21 and X0-22 flow out DC220;

[0029] Connect the voltage side of a multimeter between the wires connecting ports X0-19 and X0-21 and the wires connecting ports X0-20 and X0-22 to measure the output voltage.

[0030] The wire after port X0-21 is connected in series with a ceramic resistor, an ammeter or the current side of a multi-function meter to measure the output current of the power module K2B10L;

[0031] The DC220V output from ports X0-21 and X0-22 is connected to ports XS1-8 and XS1-9 of the first socket strip XS1 through the air switch K3 to provide monitoring signals for the insulation monitoring unit PM2J.

[0032] Optionally, when detecting the insulation monitoring unit PM2J, an AC220V working power supply is supplied to the insulation monitoring unit PM2J through ports XS1-5 and XS1-6 of the first connector XS1, and a DC220 ground signal is provided to the insulation monitoring unit PM2J through ports XS1-8, XS1-9, and XS1-10 of the first connector XS1; the signal output by the insulation monitoring unit PM2J is transmitted to the PLC in the form of a 485 signal, and the PLC communicates with the human-machine interface to display the working status of the insulation monitoring unit PM2J.

[0033] Optionally, the output end of the switching power supply outputs DC24V and is connected to ports X0-23 and X0-24 of terminal block X0. Port X0-23 is connected to ports X0-25 and X0-26, and port X0-24 is connected to ports X0-27 and X0-28, supplying power to the downstream stage in two ways:

[0034] One path passes through ports X0-26 and X0-28 of terminal block X0 as the working power supply for the human-machine interface; the other path outputs DC24 through ports X0-25 and X0-27 of terminal block X0 as the working power supply for the ammeter, and is connected to ports XS2-9 and XS2-10 of the second connector XS2 to provide monitoring signals for the battery inspection unit PM2B; the ammeter is used to measure the output current of the power module K2B10L or to construct a short-circuit test loop.

[0035] Optionally, when detecting the battery inspection unit PM2B, an AC220V working power supply is supplied to the battery inspection unit PM2B through ports XS1-5 and XS1-6 of the first socket strip XS1, and the battery inspection unit PM2B receives a DC24V voltage signal from ports XS2-9 and XS2-10 of the second socket strip XS2; the signal output by the battery inspection unit PM2B is transmitted to the PLC in the form of a 485 signal, and the PLC communicates with the human-computer interaction interface to display the working status of the battery inspection unit PM2B.

[0036] Optionally, the communication port of the PLC is divided into two paths, one of which is connected to the communication port of the human-computer interaction interface to display the test data on the human-computer interaction interface; the human-computer interaction interface includes a touch screen;

[0037] The other route is connected to ports X0-29 and X0-30 of terminal block X0 using 485 wires. X0-29 and X0-30 are connected to ports XS2-1 and XS2-2 of the second connector XS2, and serve as module signal input ports to connect the insulation monitoring unit PM2J, or AC monitoring unit PM2A, or battery inspection unit PM2B to be tested, for testing the communication function of the module unit; ports X0-31, X0-32, and X0-33 of terminal block X0 serve as common grounds and are connected to the outer casing of the box.

[0038] Compared with the prior art, the present invention has the following beneficial effects:

[0039] 1. Small size, light weight and more portable;

[0040] The test bench available on the market is fixed, large in size, and weighs several hundred kilograms. However, the portable DC test box of the present invention weighs about 50 kilograms and has a volume of 500mm*400mm*400mm, making it easy to carry.

[0041] 2. Shortened the repair time;

[0042] During emergency repairs, it used to take about 60 minutes to half a day to transport the faulty DC panel module from the site to the maintenance base. After using the portable DC test box, it only takes about 30 to 60 minutes to reach the site, greatly shortening the emergency repair time.

[0043] 3. Improve maintenance efficiency

[0044] The DC panel modules that had been repaired in the original studio needed to be sent to the line operation department for on-site testing of electrical and communication functions. This process took about 2 to 3 days, and the studio was unable to test the communication function. After using the portable DC test box, the module was repaired and directly tested on the machine. It only took 10 minutes to complete the monitoring of electrical and communication functions, greatly improving maintenance efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 is a circuit schematic diagram of a test box of the test device of the present invention;

[0046] Figure 2 This is the test box circuit wiring diagram;

[0047] Figure 3 It is a test box multi-function meter and PLC wiring diagram;

[0048] Figure 4 This is the test box ammeter wiring diagram;

[0049] Figure 5 This is the test box human-machine interface HMI wiring diagram;

[0050] Figure 6 This is the wiring diagram of the test box terminal block X0;

[0051] Figure 7 This is the wiring diagram of the test box testing power module K2B10L;

[0052] Figure 8 This is the wiring diagram of the test box for testing the insulation monitoring unit PM2J;

[0053] Figure 9 This is the wiring diagram of the PM2B battery inspection unit used in the test box;

[0054] Figure 10 This is the wiring diagram for testing the AC monitoring unit PM2A in the test box;

[0055] Figure 11 This is the wiring diagram for testing the DC monitoring unit PM2D in the test box. DETAILED DESCRIPTION

[0056] like Figure 1 、 Figure 3 As shown, the present invention provides a portable DC test box, which is equipped with a test base corresponding to the five modules of the DC panel, and can be connected to the power module K2B10L, insulation monitoring unit PM2J, AC monitoring unit PM2A, battery inspection unit PM2B, and DC monitoring unit PM2D for testing.

[0057] The test box of this invention integrates a multifunctional meter and test leads within the box. This allows testing of the module's internal test points and output current and voltage at the repair site, enabling rapid identification of module fault locations and operating conditions. The test box also features a power indicator light, a voltage test meter, a current test meter, and a signal output bus for monitoring unit operation.

[0058] For example, inside the test box, there is a PLC (HC40X model in this case) for controlling the GWDZ-6 DC panel, a human-machine interface HMI (a touch screen in this case) for displaying the working status and alarms of each unit; an isolation transformer for providing AC380 / AC220 voltage level conversion; a switching power supply for providing AC220 / DC24 AC / DC conversion; a multi-function meter for displaying current and voltage (0~600V, 0~10.00A; in this case, three dual-display DC voltage and ammeters are used), and an ammeter (0~3.000A); a 3-phase aviation plug for the external power module K2B10L, and two socket strips for the external monitoring unit.

[0059] The ports of patch strip XS1 are denoted by XS1-a in the figure, and the ports of patch strip XS2 are denoted by XS2-b in the figure, where a and b are the corresponding port numbers. The ports of terminal block X0 are denoted by X0-c in the figure, where c is the corresponding port number.

[0060] like Figure 6 As shown, ports 1, 2, and 3 of terminal block X0 are AC380 incoming lines. Port 1 connects to ports 10, 11, and 12 in parallel to form three lines. Port 2 connects to ports 7, 8, and 9 in parallel to form three lines. Port 3 connects to ports 4, 5, and 6 in parallel to form three lines. The three-phase input is split into three lines within the terminal block for downstream supply. The first line connects to the primary of isolation transformer T1 via ports 4, 7, and 10 of terminal block X0. The second line connects to 3P switch K2 via ports 5, 8, and 11 of terminal block X0. The third line connects to ports 1, 2, and 3 of patch panel XS1 via ports 6, 9, and 12 of terminal block X0.

[0061] AC220V is connected to ports 13 and 14 of terminal block X0. Port 13 is then connected to ports 17 and 18 to form two parallel paths. Port 14 is then connected to ports 15 and 16 to form two parallel paths. In other words, AC220V is divided into two paths for downstream supply: one path provides operating power to the PLC through ports 16 and 18 of X0 and is connected to the input of switching power supply T2; the other path provides power to the multi-function meter through ports 15 and 17 of terminal block X0 and is connected to ports 5 and 6 of socket strip XS1.

[0062] DC220V is connected to ports 19 and 20 (corresponding to the positive and negative poles, respectively) of terminal block X0 and then to power module K2B10L. Port 19 is also connected to port 21, and port 20 is also connected to port 22. DC220 flows out of ports 19 and 20 to socket strip XS1.

[0063] The 24V DC power is connected to terminals 23 and 24 on terminal block X0. Terminal 23 is then connected to terminals 25 and 26, which in turn are connected to terminals 27 and 28. This power is then supplied to the downstream stage in two ways. One way is used as the operating power supply for the human-machine interface (HMI) through terminals 26 and 28 on terminal block X0. The other way is used to output the 24V DC power to the ammeter through terminals 25 and 27 on terminal block X0, and is then connected to terminals 9 and 10 on socket strip XS2.

[0064] Ports 29 and 30 of the terminal block X0 are connected using 485 wires for signal output; ports 31, 32, and 33 of the terminal block X0 serve as common grounds and are connected to the housing.

[0065] Before starting the test box, connect the AC380V power supply to the XS3 aviation plug, turn on the main switch, and start testing. After testing the corresponding unit modules, disconnect the power output switches of each power supply, turn off the main switch, and unplug the XS3 aviation plug to complete the shutdown.

[0066] The three-phase input is divided into two paths: one connected to the isolation transformer and the other connected to the external aviation plug to supply K2B10L; the secondary of the isolation transformer supplies the switching power supply, PLC and multi-function meter respectively; the secondary output of the switching power supply supplies the HMI and ammeter.

[0067] like Figure 2 As shown in Figure 6, this test box is connected to an external AC380V power supply. The aviation plug XS3 is connected to ports 1, 2, and 3 of the terminal block X0 through a 3P (3-pole) switch K1 (main switch). The other way is connected to the primary of the isolation transformer T1 through ports 4, 7, and 10 of the terminal block X0. The isolation transformer T1 converts the AC380V input from the primary into AC220V and outputs it from the secondary. It is connected to ports 13 and 14 of the terminal block X0. Port 13 is then connected to ports 17 and 18, and port 14 is then connected to ports 15 and 16. The AC220V is connected to the input of the switching power supply T2 through ports 16 and 18 of the terminal block X0, and provides working power to the PLC ( Figure 3 The output end of the switching power supply T2 outputs DC24V, which is connected to ports 23 and 24 of the terminal block X0. Port 23 is then connected to ports 25 and 26, and port 24 is then connected to ports 27 and 28, supplying two routes to the subsequent stage.

[0068] like Figure 3 、 Figure 6 As shown, the other AC220V circuit supplies power to three multi-function meters through terminals 15 and 17 of terminal block X0 and is connected to terminals 5 and 6 of socket block XS1 (see Figures 8 to 10 ), used to power the module when detecting the monitoring unit PM2A / PM2B / PM2J.

[0069] like Figure 4 、 Figure 5 、 Figure 6 As shown, the output of switching power supply T2 outputs 24V DC, which is connected to terminals 23 and 24 of terminal block X0. Terminal 23 is then connected to terminals 25 and 26, which in turn are connected to terminals 27 and 28. This is divided into two paths for the downstream stage. One path, through terminals 25 and 27 of terminal block X0, outputs 24V DC as the operating power supply for the ammeter, which can be used to construct a short-circuit test circuit. The other path, through terminals 26 and 28 of terminal block X0, serves as the operating power supply for the human-machine interface (HMI). The PLC is connected to the HMI communication port, and the test data is displayed on the HMI interface.

[0070] like Figure 6、 Figure 7 As shown, ports 5, 8, and 11 of terminal block X0 are connected to a 3P switch K2. This 2P switch K2 then connects to the aviation plug XS4 that powers the power module K2B10L, controlling the AC 380V operating power supplied to the power module K2B10L. If the power module K2B10L is operating properly, it will output 220V DC, which is then fed back to the cabinet through aviation plug XS4. This 220V DC is then fed to ports 19 and 20 of terminal block X0. Port 19 is then connected to port 21, which in turn is connected to port 22. DC 220V flows from ports 19 and 20 to ports 21 and 22. The voltage side of a multimeter is connected in parallel to these wires to measure the output voltage. A ceramic resistor and an ammeter (or the current side of a multimeter) are then connected in series to the wire of port 21 to measure the output current of the power module K2B10L. Finally, the power is fed to an air switch K3, which then connects to ports 8 and 9 of power strip XS1, outputting 220V DC.

[0071] The communication port of the DC screen main control unit PLC is divided into two channels. One channel is connected to the human-machine interface HMI communication port to display the test data on the HMI interface; the other channel is connected to ports 29 and 30 of X0 using 485 wires. Ports 29 and 30 of X0 are connected to ports 1 and 2 of the socket strip XS2, and then can be connected to the unit to be monitored PM2B / PM2J / PM2A as the module signal input port to test the module communication function.

[0072] The multiple socket strips of the test box are suitable for testing different types of DC panel monitoring units to be tested; the contact wiring of each socket strip matches the inserted DC panel monitoring module to be tested; some contacts of each socket are connected inside the test device, so that the meters on the test device can be shared to indicate the test status of the inserted DC panel monitoring module to be tested.

[0073] like Figure 6 、 Figure 8 As shown, AC220V working power is supplied to the insulation monitoring unit PM2J through ports 5 and 6 of the plug strip XS1, and DC220 ground signal is provided to the insulation monitoring unit PM2J through ports 8, 9, and 10 of the plug strip XS1. The output signal of PM2J is then transmitted to the PLC in the form of a 485 signal, and the PLC communicates with the HMI to display the working status of PM2J.

[0074] like Figure 6 、 Figure 9 As shown: AC220V working power is supplied to the battery inspection unit PM2B through ports 5 and 6 of the socket strip XS1. The battery inspection unit PM2B receives the DC24V voltage signal from ports 9 and 10 of the socket strip XS2. The output signal of PM2B is then transmitted to the PLC in the form of a 485 signal. The PLC then communicates with the HMI to display the working status of PM2B.

[0075] like Figure 6 、 Figure 10 As shown, the AC220V working power supply is supplied to the AC monitoring unit PM2A through the 5th and 6th ports of the plug strip XS1. The AC monitoring unit PM2A receives the AC380V AC signal from the 1st, 2nd and 3rd ports of the plug strip XS1. The output signal of PM2A is then transmitted to the PLC in the form of a 485 signal. The PLC then communicates with the HMI to display the working status of PM2A.

[0076] like Figure 6 、 Figure 11 As shown, the AC220V working power supply is supplied to the DC monitoring module PM2D through the 5th and 6th ports of the plug strip XS1. The DC monitoring module PM2D receives the DC220V signal from the 8th and 9th ports of XS1. The output signal of PM2D is then transmitted to the PLC in the form of a 485 signal. The PLC then communicates with the HMI to display the working status of PM2D.

[0077] In summary, the testing device of the present invention tests the electrical characteristics, communication conditions, and fault conditions of various DC panel modules, effectively improving maintenance efficiency and saving costs.

[0078] The present invention solves the blind spot of on-site detection of each module unit of the DC panel, opens up a technical gap, and provides a new testing method for front-line operation and maintenance. When a fault occurs on site, the quality of each module of the DC panel can be determined in the first time, the cause of the fault can be found out, the emergency repair time can be shortened, and work efficiency can be improved.

[0079] Although the present invention has been described in detail through the above preferred embodiments, it should be understood that the above description is not intended to limit the present invention. After reading the above description, various modifications and substitutions of the present invention will become apparent to those skilled in the art. Therefore, the scope of protection of the present invention should be defined by the appended claims.

Claims

1. A portable DC test box, characterized in that: This test box is used for on-site testing of DC panels. The portable box is equipped with: Test base, for the corresponding insertion of multiple unit modules of the DC panel to be tested; Several patch panels and terminal blocks provide ports and wiring to connect the unit modules of the DC panel with the following components of the test box; PLC, controls the DC panel; A test meter used to collect current and / or voltage of the unit module; Human-computer interaction interface, used to display the working status of the unit module; Isolation transformer, used for AC voltage level conversion; Switching power supply, used for AC / DC voltage conversion; The first AC voltage input to the test box is connected to the primary of the isolation transformer and also supplies the DC panel. The isolation transformer converts the first AC voltage into a second AC voltage, which is supplied to the switching power supply, PLC, and some test meters through the secondary of the isolation transformer. The switching power supply converts the second AC voltage into a DC voltage, which is supplied to the human-machine interface and other test meters. The DC panel is a GWDZ-6 DC panel; the unit module to be tested includes an insulation monitoring unit PM2J; The power module K2B10L of the DC panel obtains AC380V working power through the second aviation plug XS4 connected to it; when the power module K2B10L is working normally, the output DC220V is sent back to the test box through the second aviation plug XS4, and the DC220V is connected to ports X0-19 and X0-20 of the terminal block X0, port X0-19 is connected to port X0-21, and port X0-20 is connected to port X0-22; the DC220V output from ports X0-21 and X0-22 is connected to ports XS1-8 and XS1-9 of the first socket row XS1 through the air switch K3, which is used to provide monitoring signals for the insulation monitoring unit PM2J; When testing the insulation monitoring unit PM2J, the insulation monitoring unit PM2J obtains an AC220V working power supply through ports XS1-5 and XS1-6 of the first plug-in strip XS1, and also obtains a DC220V ground signal through ports XS1-8, XS1-9, and XS1-10 of the first plug-in strip XS1. The signal output by the insulation monitoring unit PM2J is transmitted to the PLC in the form of a 485 signal, and the PLC communicates with the human-machine interface to display the working status of the insulation monitoring unit PM2J. The first communication port of the PLC is connected to ports X0-29 and X0-30 of the terminal block X0 using 485 wires. X0-29 and X0-30 are connected to ports XS2-1 and XS2-2 of the second connector block XS2, which serve as module signal input ports to connect to the insulation monitoring unit PM2J for communication function testing.

2. The portable DC test box according to claim 1, characterized in that: The unit modules to be tested also include: power module K2B10L, AC monitoring unit PM2A, battery inspection unit PM2B, and DC monitoring unit PM2D.

3. The portable DC test box according to claim 2, characterized in that: The first aviation plug XS3 of the external AC380V power supply is connected to ports X0-1, X0-2, and X0-3 of the terminal block X0 through the first 3P switch K1; Port X0-1 of terminal block X0 is connected to ports X0-10, X0-11, and X0-12; port X0-2 is connected to ports X0-7, X0-8, and X0-9; and port X0-3 is connected to ports X0-4, X0-5, and X0-6. The three-phase AC380V input is divided into three paths for supply to the lower level through terminal block X0: The first path is connected to the primary of the isolation transformer through ports X0-4, X0-7, and X0-10 of terminal block X0; The second path is connected to the second 3P switch K2 through ports X0-5, X0-8, and X0-11 of the terminal block X0, and is then connected to the second aviation plug XS4 that supplies power to the power module K2B10L through the second 3P switch K2; The third path is connected to the ports XS1-1, XS1-2, and XS1-3 of the first patch panel XS1 through the ports X0-6, X0-9, and X0-12 of the terminal block X0, and is used to provide monitoring signals for the AC monitoring unit PM2A.

4. The portable DC test box according to claim 3, characterized in that: The isolation transformer converts the AC380V input from the primary into AC220V, which is output from the secondary and connected to ports X0-13 and X0-14 of terminal block X0. Port X0-13 is then connected to ports X0-17 and X0-18, and port X0-14 is then connected to ports X0-15 and X0-16, splitting the AC220V into two paths for supply to the lower level. One way is through the ports X0-16 and X0-18 of the terminal block X0 to provide working power to the PLC and connect to the input of the switching power supply; The other route supplies power to the multi-function meter through ports X0-15 and X0-17 of the terminal block X0, and is connected to ports XS1-5 and XS1-6 of the first connector XS1 to power the insulation monitoring unit PM2J, or the AC monitoring unit PM2A, or the battery inspection unit PM2B being tested; the multi-function meter is used to detect the voltage and current of each unit module.

5. The portable DC test box according to claim 4, characterized in that: When testing the AC monitoring unit PM2A, the AC monitoring unit PM2A is supplied with an AC220V working power supply through the ports XS1-5 and XS1-6 of the first patch panel XS1; The AC monitoring unit PM2A receives the AC380V AC monitoring signal from ports XS1-1, XS1-2, and XS1-3 of the first connector XS1; the signal output by the AC monitoring unit PM2A is transmitted to the PLC in the form of a 485 signal, and the PLC communicates with the human-machine interface to display the working status of the AC monitoring unit PM2A.

6. The portable DC test box according to claim 4, characterized in that: Connect the voltage side of a multimeter between the wires connecting ports X0-19 and X0-21 and the wires connecting ports X0-20 and X0-22 to measure the output voltage of the power module K2B10L. A ceramic resistor, an ammeter, or the current side of a multi-function meter is connected in series to the wire after port X0-21 to measure the output current of the power module K2B10L.

7. The portable DC test box according to claim 4, characterized in that: The output end of the switching power supply outputs DC24V, which is connected to ports X0-23 and X0-24 of terminal block X0. Port X0-23 is connected to ports X0-25 and X0-26, and port X0-24 is connected to ports X0-27 and X0-28, supplying power to the downstream stage in two ways: One path passes through ports X0-26 and X0-28 of terminal block X0 as the working power supply for the human-machine interface; the other path outputs DC24 through ports X0-25 and X0-27 of terminal block X0 as the working power supply for the ammeter, and is connected to ports XS2-9 and XS2-10 of the second connector XS2 to provide monitoring signals for the battery inspection unit PM2B; the ammeter is used to measure the output current of the power module K2B10L or to construct a short-circuit test loop.

8. The portable DC test box according to claim 7, characterized in that: When testing the battery inspection unit PM2B, an AC220V working power supply is supplied to the battery inspection unit PM2B through ports XS1-5 and XS1-6 of the first socket strip XS1, and the battery inspection unit PM2B receives a DC24V voltage signal from ports XS2-9 and XS2-10 of the second socket strip XS2; the signal output by the battery inspection unit PM2B is transmitted to the PLC in the form of a 485 signal, and the PLC communicates with the human-computer interaction interface to display the working status of the battery inspection unit PM2B.

9. The portable DC test box according to any one of claims 2 to 8, characterized in that: The second communication port of the PLC is connected to the communication port of the human-computer interaction interface to display the test data on the human-computer interaction interface; the human-computer interaction interface includes a touch screen; The first communication port of the PLC also serves as the module signal input port to connect to the AC monitoring unit PM2A or battery inspection unit PM2B being tested for communication function testing; ports X0-31, X0-32, and X0-33 of the terminal block X0 serve as the common ground and are connected to the casing of the box.

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