An offline testing platform for low-voltage AC / DC power supply equipment

Abstract

This invention discloses an offline testing platform for low-voltage AC / DC power supply equipment, comprising a three-phase power supply voltage regulation module, a DC adjustable power supply module, an adjustable load module, and a communication debugging and testing host; as well as input / output interfaces for connecting to external testing equipment, and connecting cables and plugs adapted to the interfaces of equipment from different manufacturers; the three-phase power supply voltage regulation module is electrically connected to the DC adjustable power supply module, and the DC adjustable power supply module is electrically connected to the communication debugging and testing host. This invention, by setting up an integrated offline testing platform for low-voltage AC / DC power supply equipment, enables offline testing of equipment such as charging modules, UPS inverter modules, data acquisition and control modules, central monitors, and insulation monitors. Through corresponding universal module interfaces, repaired or newly purchased equipment can be powered on and tested offline before being used at the substation site. This avoids directly using potentially hazardous equipment modules on-site, which could pose safety hazards to equipment operation and lead to a waste of human and material resources.

Description

Technical Field

[0001] This invention relates to the field of AC / DC equipment testing technology in substations, and in particular to an offline testing platform for low-voltage AC / DC power supply equipment. Background Technology

[0002] Faults occur in AC / DC equipment in substations, such as charging modules, UPS inverter modules, data acquisition and control modules, central monitoring devices, and insulation monitoring instruments. A large number of equipment modules fail annually. The general approach is to disassemble and repair them, then install the repaired equipment on-site. Alternatively, for equipment that cannot be repaired, new equipment must be purchased for replacement. For repaired or newly purchased equipment, charging modules, UPS inverter modules, data acquisition and control modules, central monitoring devices, and insulation monitoring devices often lack the necessary conditions for live-line testing before replacement. Therefore, the newly purchased or repaired equipment must be directly brought to the substation for operation. However, directly replacing untested equipment on-site presents the following problems:

[0003] 1. Newly purchased or repaired equipment is put into operation on site without being properly repaired, and the problems persist, or the equipment cannot be turned on, resulting in longer defect handling time and repeated processing that wastes a lot of human and material resources.

[0004] 2. Newly purchased or repaired mold equipment may experience problems again after a few days of operation on site, or even cause new problems, which not only poses a safety hazard to the safe operation of the equipment, but also wastes human and material resources.

[0005] 3. The repaired equipment was not tested with power on, which may have caused an internal short circuit, resulting in safety issues such as circuit breaker tripping or other equipment malfunctions after installation or replacement.

[0006] 4. The communication function of newly purchased and repaired equipment cannot be tested, which leads to communication problems after on-site installation. This also requires returning the equipment to the factory for repair, delaying the troubleshooting process.

[0007] Therefore, there is an urgent need to propose an offline testing platform for equipment, which can perform offline tests on different AC and DC circuits to ensure that the equipment in the substations can be used normally, effectively eliminate safety hazards, and ensure the stable operation of the substations. Summary of the Invention

[0008] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0009] In view of the problems existing in the prior art, the present invention is proposed.

[0010] Therefore, the technical problem to be solved by the present invention is that when replacing AC / DC equipment in a substation, the new equipment is put into use directly without testing, which poses a safety hazard. Moreover, once the new equipment is damaged, it is time-consuming and laborious to disassemble and return it to the factory for replacement.

[0011] To solve the above-mentioned technical problems, the present invention provides the following technical solution: an offline testing platform for low-voltage AC / DC power supply equipment, comprising a three-phase power supply voltage regulation module, a DC adjustable power supply module, an adjustable load module, and a communication debugging and testing host; as well as input / output interfaces for connecting to external testing equipment, and connecting cables and plugs adapted to the interfaces of equipment from different manufacturers; the three-phase power supply voltage regulation module is electrically connected to the DC adjustable power supply module, and the DC adjustable power supply module is electrically connected to the communication debugging and testing host.

[0012] As a preferred embodiment of the offline testing platform for low-voltage AC / DC power supply equipment described in this invention, the three-phase power supply voltage regulation module includes a three-phase voltage regulating transformer and a controller, and the output AC voltage can be arbitrarily set by the controller;

[0013] The input terminal of the three-phase power voltage regulator module is connected to an external three-phase power input, providing power to the external test equipment and the internal modules of the test system.

[0014] As a preferred embodiment of the offline testing platform for low-voltage AC / DC power supply equipment described in this invention, the output terminal of the three-phase power supply voltage regulation module is connected to an internal or external output interface.

[0015] Internal connections include: a DC adjustable power supply module, a communication debugging and testing host, and instrument indicator lights;

[0016] External connections include: the charging module under test and the UPS power supply module under test.

[0017] As a preferred embodiment of the offline testing platform for low-voltage AC / DC power supply equipment described in this invention, the adjustable DC power supply module includes a high-frequency switching power supply module and a module controller, and the output DC can be arbitrarily set by the controller;

[0018] Three-phase alternating current is converted into a stable DC power supply with adjustable output through AC / DC conversion to power external testing equipment and internal control circuits.

[0019] The DC adjustable power module output is connected to an external output interface and includes a UPS DC input power supply, a DC monitoring device, a DC insulation monitoring device, a battery inspection device, a measurement and control module, and a data acquisition module, providing DC power to equipment waiting for testing.

[0020] As a preferred embodiment of the offline testing platform for low-voltage AC / DC power supply equipment described in this invention, the adjustable load module includes an adjustable resistive load and a cooling fan, and is configured with an external interface, which can be used as an adjustable load for the device under test. The input terminal of the adjustable load module is connected to the external interface, which can increase the test load for the test equipment.

[0021] As a preferred embodiment of the offline testing platform for low-voltage AC / DC power supply equipment described in this invention, wherein:

[0022] The communication debugging and testing host includes a computer host and a communication interface;

[0023] The input / output interfaces are connected to external devices under test via various compatible cables and plugs.

[0024] As a preferred embodiment of the offline testing platform for low-voltage AC / DC power supply equipment described in this invention, wherein:

[0025] When testing the charging module, first connect it to the charging module through a three-phase power voltage regulator module and an adjustable load module, and connect AC and load.

[0026] Adjust the AC input voltage to the rated voltage;

[0027] If the charging module malfunctions, an alarm light will be activated, prompting the charging module to be returned to the factory or replaced.

[0028] If the charging module is working properly, the operation indicator light will illuminate, thus entering the first characteristic test;

[0029] The first characteristic test includes: AC input voltage range test of 323V~456V, AC input voltage below 323V test and AC input voltage above 456V test;

[0030] If there is an abnormality, the charging module will be returned to the factory or replaced. After passing the test, the operation test and the second characteristic test will be carried out.

[0031] The second characteristic test includes voltage regulation and current regulation accuracy tests;

[0032] The operational tests include:

[0033] When the load current is adjusted to 50% of the rated current, does the charging module carry the load normally?

[0034] Does the charging module automatically limit the current when the load current is adjusted to 150% of the rated current?

[0035] After running the test, the adjustable load module adjusted the load to 50% to perform a stress test on the charging module;

[0036] If the charging module fails the stress test, it will be returned to the factory or replaced. If it passes the test, it will be installed on-site to eliminate the defect.

[0037] As a preferred embodiment of the offline testing platform for low-voltage AC / DC power supply equipment described in this invention, wherein:

[0038] When testing the UPS inverter module, first connect the three-phase power voltage regulating module and the adjustable load module to the UPS inverter module, and then adjust the AC input voltage to the rated voltage.

[0039] If an abnormality occurs, an alarm light will be activated, prompting the UPS inverter module to be returned to the factory or replaced.

[0040] If normal, the operation indicator light will illuminate, thus entering the load test and functional test;

[0041] The load test includes:

[0042] Adjusting the load module from 0 to 100% and from 100% to 0, the AC output voltage should not exceed ±10% of the rated output voltage;

[0043] When the load is adjusted to 120% of the UPS module's rated output power, the module can output stably for at least 10 minutes.

[0044] The functional tests include:

[0045] When the AC input is disconnected, the time for switching from AC power failure to battery power supply is 0ms.

[0046] Disconnect the DC input and test the switching bypass power supply time to ≤4ms.

[0047] If any abnormality occurs after load testing and functional testing, an alarm light will be activated, and the UPS inverter module will be returned to the factory or replaced.

[0048] If normal, adjust the load to 50% using the adjustable load module and perform a stress test.

[0049] If the UPS module fails the burn-in test, it will be returned to the factory or replaced. If it passes the test, it will be installed on-site to eliminate the defect.

[0050] As a preferred embodiment of the offline testing platform for low-voltage AC / DC power supply equipment described in this invention, wherein:

[0051] For communication testing, connect the DC power supply and establish communication connection before powering on.

[0052] If an abnormality occurs, an alarm light will be activated, prompting the communication module to be returned to the factory or replaced.

[0053] If operating normally, the indicator light will illuminate, indicating that a communication test is being conducted.

[0054] Test the communication module using communication debugging software and check the messages to determine any abnormalities in the communication module.

[0055] If an abnormality occurs, the communication light will not flash, and the communication module will be returned to the factory or replaced.

[0056] If the test passes, a stress test will be conducted. If the stress test passes, the module will be installed on-site. If the stress test fails, the communication module will be returned to the factory or replaced.

[0057] As a preferred embodiment of the offline testing platform for low-voltage AC / DC power supply equipment described in this invention, the stress test involves adjusting the AC voltage of the voltage regulator to the appropriate voltage, adjusting the DC load so that the module output current is 50% of the rated current, and maintaining this state for a period of time without any problems.

[0058] The beneficial effects of this invention are as follows: This invention establishes an integrated offline testing platform for low-voltage AC / DC power supply equipment, enabling offline testing of devices such as charging modules, UPS inverter modules, data acquisition and control modules, central monitoring devices, and insulation monitoring instruments. By using corresponding universal module interfaces, repaired or newly purchased equipment can be powered on and tested offline before being used at the substation. This avoids directly using potentially hazardous equipment modules on-site, preventing safety hazards to equipment operation and avoiding waste of human and material resources. Attached Figure Description

[0059] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0060] Figure 1 This is a structural diagram of the offline testing platform in an embodiment of the present invention.

[0061] Figure 2 This is a flowchart of the charging module testing process in an embodiment of the present invention.

[0062] Figure 3 This is a flowchart of the UPS inverter module test process in an embodiment of the present invention.

[0063] Figure 4 This is a flowchart of the communication test in an embodiment of the present invention. Detailed Implementation

[0064] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0065] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0066] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0067] Example 1

[0068] Reference Figure 1 This is the first embodiment of the present invention. This embodiment provides an offline test platform for low-voltage AC / DC power supply equipment, including a three-phase power supply voltage regulation module 100, a DC adjustable power supply module 200, an adjustable load module 300, and a communication debugging and test host 400.

[0069] Input / output interfaces for connecting to external testing equipment, as well as connecting cables and plugs compatible with interfaces from different manufacturers;

[0070] The three-phase power voltage regulating module 100 is electrically connected to the DC adjustable power module 200, and the DC adjustable power module 200 is electrically connected to the communication debugging and testing host 400.

[0071] The three-phase power voltage regulating module 100 includes a three-phase voltage regulating transformer and a controller, and the output AC voltage can be set arbitrarily by the controller.

[0072] The input terminal of the three-phase power voltage regulating module 100 is connected to an external three-phase power input, providing power to the external test equipment and the internal modules of the test system.

[0073] The output terminal of the three-phase power voltage regulating module 100 is connected to an internal or external output interface;

[0074] Internal connections include: DC adjustable power supply module 200, communication debugging and testing host 400, and instrument indicator lights;

[0075] External connections include: the charging module under test and the UPS power supply module under test.

[0076] The DC adjustable power supply module 200 includes a high-frequency switching power supply module and a module controller, and the output DC can be arbitrarily set by the controller;

[0077] Three-phase alternating current is converted into a stable DC power supply with adjustable output through AC / DC conversion to power external testing equipment and internal control circuits.

[0078] The DC adjustable power module 200 is connected to an external output interface and includes a UPS DC input power supply, a DC monitoring device, a DC insulation monitoring device, a battery inspection device, a measurement and control module, and a data acquisition module, providing DC power to equipment waiting for testing.

[0079] The adjustable load module 300 includes an adjustable resistive load and a cooling fan, and is equipped with an external interface. It can be used as an adjustable load for the device under test. The input terminal of the adjustable load module 300 is connected to the external interface, which can increase the test load for the test equipment.

[0080] To ensure the long-term stable operation of the testing system, it is equipped with an internal temperature controller. When the internal temperature of the system reaches the set value, the internal cooling fan is activated to ensure that the internal temperature of the system is within a controllable range.

[0081] The communication debugging and testing host 400 includes a computer host and a communication interface;

[0082] The input / output interfaces are connected to the external device under test via various compatible cables and plugs.

[0083] The input / output interfaces consist of connecting cables and aviation plugs compatible with the interfaces of major mainstream manufacturers. Their function is to connect to the external device under test (DUT) via these various compatible cables and plugs, enabling quick and reliable connection. Specifically, several quick-connect interfaces of different specifications are designed for different manufacturers and module models. This ensures a unified interface on the test system side, while providing quick-connect interfaces for charging modules of different specifications on the DUT side. Thus, when testing a specific model of DUT, only the corresponding quick-connect interface needs to be selected.

[0084] Example 2

[0085] Reference Figure 2 This is the second embodiment of the present invention, which is based on the previous embodiment. This embodiment proposes a testing method for a charging module.

[0086] When testing the charging module, first connect the charging module to the three-phase power voltage regulator module 100 and the adjustable load module 300, and connect AC and load.

[0087] Adjust the AC input voltage to the rated voltage;

[0088] If there is a charging malfunction, an alarm light will be activated, prompting the charging module to be returned to the factory or replaced.

[0089] If charging is normal, the operation indicator light will illuminate, thus entering the first characteristic test;

[0090] The first characteristic test includes: AC input voltage range test (323V~456V), AC input voltage test (below 323V), and AC input voltage test (above 456V).

[0091] If there is an abnormality, the charging module will be returned to the factory or replaced. After passing the test, the operation test and the second characteristic test will be carried out.

[0092] The second characteristic test includes voltage regulation and current regulation accuracy tests;

[0093] Specifically, the test for current stabilization accuracy includes,

[0094] Under the rated AC input voltage, when the DC output current of the charging device under test is set to one of 20%, 50%, or 100% of its rated value, the measured value of the DC current at this time is the set value of the output current of the charging device under test, and the measured values ​​at other points are compared with it.

[0095] When the AC power input voltage is adjusted to vary between 120%, 100%, and 85% of its rated value, the external resistor value is adjusted to vary the DC output voltage of the charging device under test within the range of 90% to 120% of its nominal voltage value. The DC current output value is then measured. The relative error between the measured DC output current value and its set value is the device's current stabilization accuracy.

[0096] Specifically, the voltage regulation accuracy test includes,

[0097] With the AC input voltage at its rated value, adjust the DC load current to 50% of the rated output current, adjust and determine the output voltage value of the charging device under test. The measured DC voltage value at this time is the output voltage setting value of the charging device under test, and the measured values ​​at other points are compared with it.

[0098] Note: Generally, three test points are selected: the minimum output voltage, the nominal voltage, and the float charge voltage. Adjust the AC power input voltage to vary at 120%, 100%, and 85% of its rated value. Then, adjust the external resistor to adjust the DC output current of the charging device under test at 0%, 20%, 50%, and 100% of its rated value. Measure the DC voltage output value. The relative error between the measured DC output voltage and its set value is the device's voltage regulation accuracy.

[0099] The test run includes:

[0100] When the load current is adjusted to 50% of the rated current, does the charging module carry the load normally?

[0101] Does the charging module automatically limit the current when the load current is adjusted to 150% of the rated current?

[0102] After the test runs, the adjustable load module 300 adjusts the load to 50% to perform a stress test on the charging module.

[0103] If the charging module fails the stress test, it will be returned to the factory or replaced. If it passes the test, it will be installed on-site to eliminate the defect.

[0104] Example 3

[0105] Reference Figure 3 This is the third embodiment of the present invention. Based on the previous two embodiments, this embodiment proposes a test method for UPS inverter modules.

[0106] When testing the UPS inverter module, first connect the three-phase power voltage regulating module 100 and the adjustable load module 300 to the UPS inverter module, and then adjust the AC input voltage to the rated voltage.

[0107] If an abnormality occurs, an alarm light will be activated, prompting the UPS inverter module to be returned to the factory or replaced.

[0108] If normal, the operation indicator light will illuminate, thus entering the load test and functional test;

[0109] Load testing includes:

[0110] Adjusting the load module from 0 to 100% and from 100% to 0, the AC output voltage should not exceed ±10% of the rated output voltage;

[0111] When the load is adjusted to 120% of the UPS module's rated output power, the module can output stably for at least 10 minutes.

[0112] Functional testing includes:

[0113] When the AC input is disconnected, the time for switching from AC power failure to battery power supply is 0ms.

[0114] Disconnect the DC input and test the switching bypass power supply time to ≤4ms.

[0115] If any abnormality occurs after load testing and functional testing, an alarm light will be activated, and the UPS inverter module will be returned to the factory or replaced.

[0116] If normal, adjust the load to 50% using the adjustable load module 300 and perform a stress test.

[0117] If the UPS module fails the burn-in test, it will be returned to the factory or replaced. If it passes the test, it will be installed on-site to eliminate the defect.

[0118] Example 4

[0119] Reference Figure 4 This is the fourth embodiment of the present invention. Based on the previous three embodiments, this embodiment proposes a test method for communication testing.

[0120] For communication testing, connect the DC power supply and establish communication connection before powering on.

[0121] If an abnormality occurs, an alarm light will be activated, prompting the communication module to be returned to the factory or replaced.

[0122] If operating normally, the indicator light will illuminate, indicating that a communication test is being conducted.

[0123] Test the communication module using communication debugging software and check the messages to determine any abnormalities in the communication module.

[0124] If an abnormality occurs (no messages are sent or received, or data is abnormal), the communication light will not flash, and an alarm will be triggered by the alarm light, thus requiring the communication module to be returned to the factory or replaced.

[0125] If the test passes, a stress test will be conducted. If the stress test passes, the module will be installed on-site. If the stress test fails, the communication module will be returned to the factory or replaced.

[0126] Specifically, communication debugging software mainly includes serial communication debugging software and TCP network communication debugging software.

[0127] Serial communication debugging software is primarily used in the field of microcontroller control. Communication between devices commonly uses serial communication, with common hardware communication networks including RS485 / RS422 / RS232. Various devices and data acquisition modules in AC / DC power systems primarily use serial communication for internal communication. Corresponding serial port debugging tools can be used to monitor and analyze the communication process. This debugging process requires computer communication software, such as serial port debugging assistants, which are widely available. These programs monitor the communication process, collect data, and perform data analysis to determine if the communication is functioning correctly.

[0128] TCP network port communication debugging software is mainly used for: the host computer communication of AC / DC power supply equipment may be serial port or Ethernet port. If it is network port, TCP network port communication debugging software can be used to monitor the device's message sending and receiving status, perform data analysis, and make a preliminary judgment that the communication is normal.

[0129] Specific operating procedures may vary slightly depending on the software used. The testing method involves connecting the power supply of the device under test (DUT) to the DC power output of the test platform to power on the device. Then, connect the DUT's communication interface to the corresponding serial or network port of the debugging computer. Open the debugging software on the debugging computer and observe the transmitted and received message data in the software's visual window interface to analyze and determine whether the DUT's communication interface and communication function are normal. Through this communication test, communication tests can be performed on devices with communication interfaces, such as DC monitoring devices, DC insulation monitoring devices, battery inspection devices, measurement and control modules, and data acquisition modules.

[0130] It should be noted that when conducting offline testing on other modules, such as various devices and data acquisition modules, the testing is generally similar to that of the modules mentioned above. The general principle is to power on the device under test to simulate the on-site working environment, and then conduct tests according to the technical requirements of the corresponding equipment, devices, and modules in the regulations to determine whether the equipment is working properly, whether its functions are complete, and whether its technology meets the operational requirements. This achieves offline testing of the equipment. After the offline test is passed, the equipment is then installed and used in the substation.

[0131] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape, and proportions of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of the invention. The order or sequence of any process or method steps may be changed or rearranged according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structurally equivalent but also equivalent in structure. Other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments without departing from the scope of the invention. Therefore, the present invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0132] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the currently considered best mode for carrying out the invention, or those features that are not relevant to implementing the invention) may be omitted.

[0133] It should be understood that numerous specific implementation decisions can be made during the development of any practical implementation, such as in any engineering or design project. Such development efforts may be complex and time-consuming, but for those skilled in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.

[0134] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. An offline testing platform for low-voltage AC / DC power supply equipment, characterized in that: include, Three-phase power voltage regulation module (100), DC adjustable power supply module (200), adjustable load module (300) and communication debugging and testing host (400). Input / output interfaces for connecting to external testing equipment, as well as connecting cables and plugs compatible with interfaces from different manufacturers; The three-phase power supply voltage regulation module (100) is electrically connected to the DC adjustable power supply module (200), and the DC adjustable power supply module (200) is electrically connected to the communication debugging and testing host (400); When testing the charging module, first connect the charging module to the three-phase power supply voltage regulator module (100) and the adjustable load module (300), and connect AC and load; Adjust the AC input voltage to the rated voltage; If the charging module malfunctions, an alarm light will be activated, prompting the charging module to be returned to the factory or replaced. If the charging module is working properly, the operation indicator light will illuminate, thus entering the first characteristic test; The first characteristic test includes: AC input voltage range test of 323V~456V, AC input voltage below 323V test and AC input voltage above 456V test; If there is an abnormality, the charging module will be returned to the factory or replaced. After passing the test, the operation test and the second characteristic test will be carried out. The second characteristic test includes voltage regulation and current regulation accuracy tests; The operational tests include: When the load current is adjusted to 50% of the rated current, does the charging module carry the load normally? Does the charging module automatically limit the current when the load current is adjusted to 150% of the rated current? After running the test, the adjustable load module (300) adjusts the load to 50% to perform a stress test on the charging module; If the charging module fails the stress test, it will be returned to the factory or replaced. If it passes the test, it will be installed on-site to eliminate the defect.

2. The offline testing platform for low-voltage AC / DC power supply equipment as described in claim 1, characterized in that: The three-phase power supply voltage regulating module (100) includes a three-phase voltage regulating transformer and a controller, and the output AC voltage can be arbitrarily set by the controller; The input terminal of the three-phase power voltage regulating module (100) is connected to the external three-phase power input to provide power for the external test equipment and the working power for the internal modules of the test system.

3. The offline testing platform for low-voltage AC / DC power supply equipment as described in claim 2, characterized in that: The output terminal of the three-phase power supply voltage regulating module (100) is connected to an internal or external output interface; The internal connections include: a DC adjustable power supply module (200), a communication debugging and testing host (400), and instrument indicator lights; External connections include: the charging module under test and the UPS power supply module under test, etc.

4. The offline testing platform for low-voltage AC / DC power supply equipment as described in claim 1, characterized in that: The DC adjustable power supply module (200) includes a high-frequency switching power supply module and a module controller, and the output DC can be arbitrarily set by the controller; Three-phase alternating current is converted into a stable DC power supply with adjustable output through AC / DC conversion to power external testing equipment and internal control circuits. The DC adjustable power module (200) is connected to an external output interface at its output end and includes a UPS DC input power supply, a DC monitoring device, a DC insulation monitoring device, a battery inspection device, a measurement and control module, and an acquisition module, providing DC power to the equipment under test.

5. The offline testing platform for low-voltage AC / DC power supply equipment as described in claim 1, characterized in that: The adjustable load module (300) includes an adjustable resistive load and a cooling fan, and is configured with an external interface. It can be used as an adjustable load for the device under test. The input terminal of the adjustable load module (300) is connected to the external interface, which can provide a test load for the test device.

6. The offline testing platform for low-voltage AC / DC power supply equipment as described in claim 4 or 5, characterized in that: The communication debugging and testing host (400) includes a computer host and a communication interface; The input / output interfaces are connected to external devices under test via various compatible cables and plugs.

7. The offline testing platform for low-voltage AC / DC power supply equipment as described in claim 3, characterized in that: When testing the UPS inverter module, first connect the three-phase power voltage regulating module (100) and the adjustable load module (300) to the UPS inverter module, and then adjust the AC input voltage to the rated voltage. If an abnormality occurs, an alarm light will be activated, prompting the UPS inverter module to be returned to the factory or replaced. If normal, the operation indicator light will illuminate, thus entering the load test and functional test; The load test includes: Adjusting the load module from 0 to 100% and from 100% to 0, the AC output voltage should not exceed ±10% of the rated output voltage; When the load is adjusted to 120% of the UPS module's rated output power, the module can output stably for at least 10 minutes. The functional tests include: When the AC input is disconnected, the time for switching from AC power failure to battery power supply is 0ms. Disconnect the DC input and test the switching bypass power supply time to ≤4ms. If any abnormality occurs after load testing and functional testing, an alarm light will be activated, and the UPS inverter module will be returned to the factory or replaced. If normal, adjust the load to 50% using the adjustable load module (300) and perform a stress test; If the UPS module fails the burn-in test, it will be returned to the factory or replaced. If it passes the test, it will be installed on-site to eliminate the defect.

8. The offline testing platform for low-voltage AC / DC power supply equipment as described in claim 7, characterized in that: For communication testing, connect the DC power supply and establish communication connection before powering on. If an abnormality occurs, an alarm light will be activated, prompting the communication module to be returned to the factory or replaced. If operating normally, the indicator light will illuminate, indicating that a communication test is being conducted. Test the communication module using communication debugging software and check the messages to determine any abnormalities in the communication module. If an abnormality occurs, the communication light will not flash, and the communication module will be returned to the factory or replaced. If the test passes, a stress test will be conducted. If the stress test passes, the module will be installed on-site. If the stress test fails, the communication module will be returned to the factory or replaced.

9. The offline testing platform for low-voltage AC / DC power supply equipment as described in claim 8, characterized in that: The aforementioned stress test involves adjusting the AC voltage of the voltage regulator to the appropriate voltage, adjusting the DC load so that the module's output current is 50% of the rated current, and maintaining this state for a period of time without any problems.

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