Cold-pressed terminal short-circuit testing machine

Abstract

The invention discloses a cold-pressed terminal short-circuit testing machine, and the machine comprises a power conversion unit of which the power input end is used for receiving a three-phase alternating current, and the power output end is used for outputting a multi-phase balanced low-voltage power; the electric energy input end of the current output unit is connected to the power output end of the power conversion unit, and the current output end of the current output unit is used for outputting test current to the tested cold-pressed terminal; the control unit comprises a control signal output end and a feedback signal input end; wherein the power conversion unit further comprises a controlled end, and the control signal output end is connected with the controlled end and used for sending a control instruction to the power conversion unit; and the feedback signal input end is connected to the current output end and is used for collecting a feedback signal reflecting the test current.

Description

[0001] This application belongs to the field of electrical testing equipment technology, specifically relating to a cold-pressed terminal short-circuit tester. Background Technology

[0002] Short-circuit withstand capability testing of cold-pressed terminals is a crucial step in ensuring the safety of power connections, especially for terminals with high current ratings of 50kA and above, where the demand for testing is increasingly urgent. Currently, most mainstream testing equipment uses transformer current boosting or capacitor discharge to generate high current, but these methods generally suffer from insufficient output capacity, large current fluctuations, low power factor leading to high energy consumption, and imbalances in the three-phase power grid caused by single-phase high-power consumption. Existing technical solutions attempting to address these issues are often complex in structure, expensive, have limited functionality, and insufficient safety protection, failing to meet the requirements of modern testing that demands high precision, high efficiency, and high reliability.

[0003] Therefore, there is an urgent need to develop a new type of cold-pressed terminal short-circuit tester that can meet high-standard testing requirements such as 50KA / 5s, while fundamentally solving problems such as current output stability, system energy efficiency, three-phase balance, multi-functional integration, and safety protection. Summary of the Invention

[0004] This application aims to solve at least one of the technical problems existing in the prior art. To this end, this application proposes a cold-pressed terminal short-circuit testing machine.

[0005] In a first aspect, embodiments of this application provide a cold-pressed terminal short-circuit tester, comprising: The power conversion unit has a power input terminal for receiving three-phase AC power and a power output terminal for outputting multi-phase balanced low-voltage power. The current output unit has its power input terminal connected to the power output terminal of the power conversion unit, and its current output terminal is used to output test current to the cold-pressed terminal under test. The control unit includes a control signal output terminal and a feedback signal input terminal; The power conversion unit further includes a controlled terminal, and the control signal output terminal is connected to the controlled terminal for sending control commands to the power conversion unit; the feedback signal input terminal is connected to the current output terminal for collecting feedback signals reflecting the test current. The control unit is configured to send a control command to the controlled terminal through the control signal output terminal based on a preset target test current and a feedback signal obtained from the feedback signal input terminal, thereby adjusting the low-voltage electricity output by the power supply output terminal so that the current output terminal outputs the target test current.

[0006] Optionally, the power conversion unit includes a balancing transformer and an induction voltage regulator; The primary winding of the balancing transformer is used to form the power input terminal, and the secondary winding of the balancing transformer outputs multiphase balanced electricity. The input terminal of the inductive voltage regulator is connected to the secondary winding, the output terminal of the inductive voltage regulator constitutes the power output terminal, the adjustment mechanism of the inductive voltage regulator constitutes the controlled terminal of the power conversion unit, and is connected to the control signal output terminal.

[0007] Optionally, the balancing transformer is a Scott transformer.

[0008] Optionally, the current output unit includes multiple single-phase high-current generators connected in parallel; The input terminals of each of the single-phase high-current generators are connected in parallel to form the power input terminal of the current output unit; and the output terminals of each of the single-phase high-current generators are connected in parallel to form the current output terminal of the current output unit.

[0009] Optionally, the control unit is specifically configured to execute a load dynamic pre-constant current regulation algorithm; The execution load dynamic pre-constant current adjustment algorithm includes: The control signal output terminal sends a target test command to the controlled terminal, causing the power conversion unit to output a target test voltage, and records the target feedback current obtained through the feedback signal input terminal at this time. Based on the target test current, the target test voltage, and the target feedback current, the initial control command is calculated and obtained; During the output of the target test current, the deviation between the feedback signal and the target test current is continuously compared, and the initial control command is dynamically corrected based on the deviation to generate a real-time control command. The real-time command is sent to the controlled terminal through the control signal output terminal.

[0010] Optionally, a security protection unit may also be included; The safety protection unit includes a fault detection terminal and a protection execution terminal; The fault detection terminal is connected to the current output terminal or the feedback signal input terminal of the control unit, and is used to acquire the test current or the feedback signal; The protection execution terminal is connected to the power input terminal of the power conversion unit or the control signal output terminal, and is used to cut off the power supply to the power input terminal or output a protection command when the fault detection terminal detects an overcurrent or short circuit fault.

[0011] Optionally, a data acquisition unit may also be included; The signal acquisition terminal of the data acquisition unit is connected to the current output terminal and / or the feedback signal input terminal, and is used to acquire the test current and / or the feedback signal. The data output terminal of the data acquisition unit is communicatively connected to the control unit, and is used to send the acquired data to the control unit for storage and processing.

[0012] Optionally, the control unit may further include a human-machine interface port; The human-machine interface port is used to receive the preset target test current parameters input from the outside, and to display the waveform or value of the test current to the outside.

[0013] Optionally, a loop test control module may also be included; The cyclic test control module is integrated into the control unit or communicates with the control unit as an independent module. The cyclic test control module is configured to: set a cyclic test current value lower than the short-circuit withstand current, as well as the number of cycles and time intervals, and drive the control unit to execute the output and shutdown of the target test current within each cycle.

[0014] Optionally, the inductive voltage regulator is an oil-immersed inductive voltage regulator; The oil tank housing of the oil-immersed induction pressure regulator is equipped with an oil temperature monitoring interface; The oil temperature monitoring interface is connected to the fault detection terminal of the control unit or the safety protection unit, and is used to trigger an alarm or protection action when the oil temperature exceeds the threshold.

[0015] The technical solution provided in this application firstly uses a power conversion unit that integrates a balancing transformer (such as a Scott transformer) to receive three-phase AC power and output multi-phase balanced low-voltage power, thereby efficiently solving the problem of three-phase power grid imbalance caused by single-phase high-power loads from the source.

[0016] Secondly, through the load dynamic pre-constant current regulation algorithm executed by the control unit, the system dynamically generates and issues precise control commands based on the preset target test current and the feedback signals collected in real time from the current output unit, and adjusts the output of the power conversion unit (preferably including an inductive voltage regulator), so that the parallel current output unit can stably output and maintain a high-precision target large current.

[0017] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0018] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of the test system topology provided in an embodiment of this application; Figure 2 This is a schematic diagram of the Scott transformer winding structure provided in an embodiment of this application; Figure 3 This is a schematic diagram of the execution load dynamic pre-constant current adjustment algorithm provided in the embodiments of this application. Detailed Implementation

[0019] Embodiments of this application will now be described in more detail with reference to the accompanying drawings. While some embodiments of this application are shown in the drawings, it should be understood that this application can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this application. It should be understood that the drawings and embodiments of this application are for illustrative purposes only and are not intended to limit the scope of protection of this application.

[0020] It should be understood that the steps described in the method embodiments of this application may be performed in different orders and / or in parallel. Furthermore, the method embodiments may include additional steps and / or omit the steps shown. The scope of this application is not limited in this respect.

[0021] As described in the background section, short-circuit withstand capability testing of cold-pressed terminals is a crucial step in ensuring the safety of power connections, especially for terminals with high current ratings of 50kA and above, where the testing needs are increasingly urgent. Currently, most mainstream testing equipment uses transformer current boosting or capacitor discharge to generate high current, but these methods generally suffer from insufficient output capacity, large current fluctuations, low power factor leading to high energy consumption, and imbalances in the three-phase power grid caused by single-phase high-power consumption. Existing technical solutions, in attempting to address these issues, are often complex in structure, expensive, have limited functionality, and insufficient safety protection, making it difficult to meet the requirements of modern testing that demands high precision, high efficiency, and high reliability.

[0022] Therefore, there is an urgent need to develop a new type of cold-pressed terminal short-circuit tester that can meet high-standard testing requirements such as 50KA / 5s, while fundamentally solving problems such as current output stability, system energy efficiency, three-phase balance, multi-functional integration, and safety protection.

[0023] Based on this, this application proposes a cold-pressed terminal short-circuit tester, which, through a power conversion unit integrating a balancing transformer (such as a Scott transformer), receives three-phase AC power and outputs multi-phase balanced low-voltage power, thus efficiently solving the problem of three-phase power grid imbalance caused by single-phase high-power loads from the source.

[0024] Secondly, through the load dynamic pre-constant current regulation algorithm executed by the control unit, the system dynamically generates and issues precise control commands based on the preset target test current and the feedback signals collected in real time from the current output unit, and adjusts the output of the power conversion unit (preferably including an inductive voltage regulator), so that the parallel current output unit can stably output and maintain a high-precision target large current.

[0025] Figure 1 A schematic diagram of the test system topology provided in the embodiments of this application.

[0026] In some alternative embodiments, combined with Figure 1 As shown, a cold-pressed terminal short-circuit tester is provided. Figure 1 As shown on the left, the entire system begins with the "AC control incoming cabinet," whose "three-phase AC 400V input" port constitutes the power input terminal of the entire system, used to receive three-phase AC power. This incoming cabinet integrates protection and monitoring devices such as circuit breakers and instrument transformers, and its output is connected to the "Scott transformer" module. The Scott transformer, as a balancing transformer, is the core of the power conversion unit in this embodiment, responsible for converting the input three-phase power into multi-phase balanced low-voltage power.

[0027] like Figure 1 As shown in the middle, the output of the Scott transformer is connected to the "induction voltage regulator" module ( Figure 1 The part marked in the middle is the voltage regulating component. The output terminal of the inductive voltage regulator is the power output terminal of the entire power conversion unit. The continuously adjustable low voltage output is sent to the "high current generator" module ( Figure 1 The module (represented by multiple parallel Tr transformer symbols) constitutes the current output unit. The output of the high-current generator is connected to the test fixture via a large-section copper busbar, and its output terminal is the current output terminal of the current output unit, used to output test current to the cold-pressed terminal under test.

[0028] like Figure 1 As shown on the right, the system includes a "low-voltage control cabinet." Control units (such as PLCs and industrial computers) are housed in this cabinet. The control signal output of the control unit is connected to the regulating mechanism (its controlled end) of the inductive voltage regulator via control lines, while its feedback signal input is connected to the output of the high-current generator (current output end) via a sensor (such as a Rogowski coil) to collect the feedback signal.

[0029] In this embodiment, combined with Figure 1The system topology forms a clear three-stage energy transfer and control closed loop. The first stage (Scott transformer) solves the power balance problem; the second stage (induction voltage regulator + high current generator) realizes voltage-to-current conversion and regulation; the third stage (control unit) completes high-precision closed-loop control based on algorithms. This architecture enables the testing machine to work as an organic whole, coordinating its operations to ultimately achieve a stable output of the preset target test current by the current output unit.

[0030] In some optional embodiments, the power conversion unit of this disclosure is specified, and its structure is clearly embodied in... Figure 1 The power conversion unit is clearly composed of a Scott transformer and an induction voltage regulator connected in series.

[0031] The Scott transformer, as the first stage, has its input side (primary side) as... Figure 1 The three-phase AC400V output from the central incoming line cabinet constitutes the power input terminal of the system. Its output is a balanced multiphase power, which is sent to the next stage.

[0032] The inductive voltage regulator, as the second stage, in Figure 1 It is immediately following the Scott transformer. Its input terminal is connected to the output of the Scott transformer, and its output terminal ( Figure 1 The high-current generator (pointing to the center) forms the power output terminal of the entire power conversion unit. The regulating mechanism inside the induction voltage regulator (such as a motor-driven carbon brush) constitutes its controlled terminal, which is connected to the control circuit... Figure 1 The control unit in the low-voltage control cabinet on the right is connected.

[0033] In this embodiment, through Figure 1 The physical connection and energy flow of the "Scott transformer → induction voltage regulator" shown demonstrate the technical advantages of this two-stage architecture. The front stage solves grid balance, while the back stage provides fine regulation. As a controlled actuator, the induction voltage regulator receives instructions from the control unit to achieve continuous and smooth regulation of the voltage ultimately output to the high-current generator, laying the foundation for generating a stable high current.

[0034] Figure 2 This is a schematic diagram of the Scott transformer winding structure provided in an embodiment of this application; In some alternative embodiments, the balancing transformer of this disclosure is preferred, and reference is made to... Figure 2 Describe its specific structure. This balancing transformer is specifically a Scott transformer, and its winding structure is as follows: Figure 2 As shown.

[0035] Figure 2In the diagram, A, B, and C on the left represent the three-phase input windings. Through a special winding connection (as shown by the T-winding and M-winding in the diagram), the Scott transformer converts the three-phase symmetrical input voltage into a two-phase output voltage. Specifically, the voltage amplitudes output by the T-phase (Teaser) winding and the M-phase (Main) winding are equal, with a phase difference of 90 degrees (or designed according to a specific turns ratio), thus achieving a balanced conversion from three-phase to two-phase. In this embodiment, the input is three-phase AC 400V, and the output is two-phase 550V.

[0036] In this embodiment, combined with Figure 2 The classic Scott connection principle shown in the diagram is replaced by a passive, reliable, and economical three-phase balancing solution. Compared to complex power electronic compensation devices, the Scott transformer requires no additional control power supply or cooling system, has a robust structure, and is easy to maintain. It fundamentally and cost-effectively solves the problem of severe three-phase current imbalance on the grid side caused by the testing machine acting as a single-phase high-power load, reducing the negative impact of the equipment on the grid and the associated power supply costs.

[0037] In some optional embodiments, the current output unit of this disclosure is further specified, and its structure is intuitively reflected in... Figure 1 The current output unit adopts a modular parallel structure, consisting of... Figure 1 The multiple parallel "Tr" symbols in the middle indicate that multiple (e.g., 8) single-phase high-current generators are connected in parallel.

[0038] like Figure 1 As shown, the input terminals (primary sides) of all high current generators (Tr) are connected in parallel and together to the output terminal of the induction voltage regulator, thus forming the total power input terminal of the current output unit. The output terminals (secondary sides, usually single-turn or multi-turn large-section copper busbars) of all high current generators (Tr) are also connected in parallel, and after being combined, they are connected to the output busbar and the test fixture, thus forming the total current output terminal of the current output unit.

[0039] In this embodiment, Figure 1 This clearly demonstrates the modular, parallel output structure. The design distributes the total output current of up to 50kA across multiple independent units, reducing the size and manufacturing complexity of individual magnetic components and optimizing the heat dissipation path. Simultaneously, the parallel structure provides redundancy; the failure of a single generator will not interrupt testing, improving system availability and maintainability, and facilitating future adjustments to the device's current output capability by adding or removing modules.

[0040] Figure 3 This is a schematic diagram of the execution load dynamic pre-constant current adjustment algorithm provided in the embodiments of this application.

[0041] In some optional embodiments, the execution logic of the control unit in claim 1 is specified, and its flow is as follows: Figure 3 As shown. This control unit is programmed to execute a "load dynamic pre-constant current regulation algorithm". Figure 3 The four core steps of the algorithm are shown in detail.

[0042] Step S10 (Prediction): First, the control unit sends a "target test command" (corresponding to a lower voltage setpoint) to the controlled terminal of the inductive voltage regulator via the control signal output terminal, causing the power conversion unit to output a lower "target test voltage". Simultaneously, the system records the "target feedback current" flowing through the load at this time via the feedback signal input terminal (connected to a current sensor). For example... Figure 3 As shown in the first step, this process aims to obtain the initial voltage-current relationship of the system under the current load.

[0043] Step S20 (Pre-calculation): Next, as... Figure 3 As shown in the second step, the algorithm calculates the equivalent impedance of the current load based on the target test voltage and target feedback current measured in the first step. Then, combined with the final "target test current" set by the user, it uses a preset model or formula to calculate the "initial control command" (such as the target position or initial voltage value of the induction voltage regulator) required for the system to reach the target current.

[0044] Step S30 (Dynamic Fine-tuning): During the actual output of high current, such as Figure 3 As shown in the third step, the algorithm enters the closed-loop dynamic adjustment stage. It continuously compares the deviation between the real-time "feedback signal" collected from the current output terminal and the "target test current". Based on this deviation, the algorithm performs real-time and dynamic correction on the "initial control command" obtained in step S32, generating a "real-time control command".

[0045] Step S40 (Instruction Output): Finally, as shown... Figure 3 As shown in step four, the generated "real-time control command" is sent to the controlled end of the inductive voltage regulator through the control signal output terminal, completing one adjustment cycle. This process is repeated at high speed during the test (e.g., within 5 seconds) to achieve constant current control.

[0046] In this embodiment, combined with Figure 3The algorithm flowchart illustrates a "learn first, control later" intelligent regulation strategy. Through the "predictive input" in S31, the system automatically adapts to different load impedances, avoiding blind current surges. Through the "dynamic fine-tuning" in S33, the system can compensate for disturbances caused by load heating, power fluctuations, etc., in real time. The entire algorithm does not rely on fast but expensive electronic components such as thyristors; instead, it fully leverages the regulation potential of the inductive voltage regulator through algorithm optimization, thereby achieving high-precision (within ±1%) constant current output at a lower cost while maintaining power waveform quality.

[0047] In some optional embodiments, the testing machine also includes a separate safety protection unit. Its fault detection terminal can directly detect faults from... Figure 1 The sampled current signal on the total output busbar of the medium current output unit can also be connected to the existing high-precision feedback signal path of the control unit. Its protection execution terminal is connected in parallel to the main circuit breaker tripping circuit in the incoming line cabinet (corresponding to the power supply input terminal) in a high-priority manner, or connected in parallel to the final output drive circuit of the control unit controlling the inductive voltage regulator (corresponding to the overriding control command).

[0048] In this embodiment, the safety protection unit constitutes a hardware monitoring unit independent of the main control system. It employs fast analog circuits or dedicated protection devices for judgment, with a response speed in the millisecond range. When dangerous signals such as overcurrent or short circuits are detected, it can bypass the normal logic of the control unit and directly trigger the most fundamental protection action (power off or forced voltage regulator reset to zero). This combination of hard-wired protection and software protection provides the highest level of safety assurance for the equipment under extreme abnormal conditions, ensuring the safety of operators and the equipment itself.

[0049] In some optional embodiments, the testing machine also integrates a data acquisition unit. Its signal acquisition terminal is connected to a high-precision sensor. Figure 1 The current output terminal in the device acquires the current waveform and can be extended to connect to multiple temperature probes (attached to the terminal being measured). Its data output terminal is connected to the control unit (industrial computer) in the low-voltage control cabinet via a communication network (such as Ethernet).

[0050] In this embodiment, the data acquisition unit achieves high-speed digital recording of all parameters during the testing process. It not only acquires the current feedback signal used for closed-loop control but also simultaneously records the voltage waveform and temperature rise curves at various terminals. All data is timestamped, fully stored, and can be played back and analyzed in the control unit's software interface. This completely changes the traditional testing model that only records the final result or a few key data points, achieving comprehensive traceability of the testing process and providing a solid data foundation for fault analysis, standard compliance verification, and product quality improvement.

[0051] In some optional embodiments, the control unit of this disclosure integrates a rich set of human-machine interaction ports, specifically embodied in... Figure 1 The low-voltage control cabinet on the right typically includes an industrial touchscreen, indicator lights, buttons, and a printer.

[0052] In this embodiment, through an integrated human-machine interface, operators can easily complete all test settings: inputting the target test current and time, and selecting a standard test procedure or a custom step. During the test, real-time curves and values ​​of current, voltage, and temperature are clearly displayed on the screen. After the test, the system can automatically generate and print a test report containing all key data and waveforms. This greatly simplifies operation, reduces human error, and improves the standardization and efficiency of testing.

[0053] In some alternative embodiments, the functionality of the testing machine is expanded to include cyclic testing control capabilities through software in the control unit or by adding independent modules.

[0054] In this embodiment, the user can set a low constant current value (e.g., 5000A), as well as the number of cycles, energizing time, and interval. The system will automatically and periodically control the current output unit to output and cut off the current, simulating thermal cycling conditions. This allows a single device to perform both instantaneous high-current short-circuit withstand tests and long-term, periodic thermal cycling tests, achieving functional integration and maximizing testing efficiency, thus meeting more comprehensive product verification needs.

[0055] In some alternative embodiments, the inductive voltage regulator of this disclosure is optimized by adopting an oil-immersed cooling structure and providing an oil temperature monitoring interface on its oil tank.

[0056] In this embodiment, oil-immersed cooling ensures excellent heat dissipation and insulation performance of the induction voltage regulator under high-current impact operation, improving long-term operational reliability. The added oil temperature monitoring interface allows temperature signals to be connected to the control unit or safety protection unit. The system can monitor the internal oil temperature of the voltage regulator in real time; if an abnormal temperature rise occurs, it can provide early warning or activate protection, achieving predictive health management of core components, avoiding equipment damage due to overheating, and further improving the safety and service life of the entire system.

[0057] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0058] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other implementations under the guidance of this application without departing from the spirit and scope of the claims. All of these implementations are within the protection scope of this application.

Claims

1. A cold-pressed terminal short-circuit tester, characterized in that, include: The power conversion unit has a power input terminal for receiving three-phase AC power and a power output terminal for outputting multi-phase balanced low-voltage power. The current output unit has its power input terminal connected to the power output terminal of the power conversion unit, and its current output terminal is used to output test current to the cold-pressed terminal under test. The control unit includes a control signal output terminal and a feedback signal input terminal; The power conversion unit further includes a controlled terminal, and the control signal output terminal is connected to the controlled terminal for sending control commands to the power conversion unit; the feedback signal input terminal is connected to the current output terminal for collecting feedback signals reflecting the test current. The control unit is configured to send a control command to the controlled terminal through the control signal output terminal based on a preset target test current and a feedback signal obtained from the feedback signal input terminal, thereby adjusting the low-voltage electricity output by the power supply output terminal so that the current output terminal outputs the target test current.

2. The cold-pressed terminal short-circuit tester according to claim 1, characterized in that, The power conversion unit includes a balancing transformer and an induction voltage regulator; The primary winding of the balancing transformer is used to form the power input terminal, and the secondary winding of the balancing transformer outputs multiphase balanced electricity. The input terminal of the inductive voltage regulator is connected to the secondary winding, the output terminal of the inductive voltage regulator constitutes the power output terminal, the adjustment mechanism of the inductive voltage regulator constitutes the controlled terminal of the power conversion unit, and is connected to the control signal output terminal.

3. The cold-pressed terminal short-circuit tester according to claim 2, characterized in that, The balancing transformer is a Scott transformer.

4. The cold-pressed terminal short-circuit tester according to claim 1, characterized in that, The current output unit includes multiple single-phase high-current generators connected in parallel; The input terminals of each of the single-phase high-current generators are connected in parallel to form the power input terminal of the current output unit; and the output terminals of each of the single-phase high-current generators are connected in parallel to form the current output terminal of the current output unit.

5. The cold-pressed terminal short-circuit tester according to claim 1, characterized in that, The control unit is specifically configured to execute a load dynamic pre-constant current regulation algorithm; The execution load dynamic pre-constant current adjustment algorithm includes: The control signal output terminal sends a target test command to the controlled terminal, causing the power conversion unit to output a target test voltage, and records the target feedback current obtained through the feedback signal input terminal at this time. Based on the target test current, the target test voltage, and the target feedback current, the initial control command is calculated and obtained; During the output of the target test current, the deviation between the feedback signal and the target test current is continuously compared, and the initial control command is dynamically corrected based on the deviation to generate a real-time control command. The real-time command is sent to the controlled terminal through the control signal output terminal.

6. The cold-pressed terminal short-circuit tester according to claim 2, characterized in that, It also includes a security protection unit; The safety protection unit includes a fault detection terminal and a protection execution terminal; The fault detection terminal is connected to the current output terminal or the feedback signal input terminal of the control unit, and is used to acquire the test current or the feedback signal; The protection execution terminal is connected to the power input terminal of the power conversion unit or the control signal output terminal, and is used to cut off the power supply to the power input terminal or output a protection command when the fault detection terminal detects an overcurrent or short circuit fault.

7. The cold-pressed terminal short-circuit tester according to claim 1, characterized in that, It also includes a data acquisition unit; The signal acquisition terminal of the data acquisition unit is connected to the current output terminal and / or the feedback signal input terminal, and is used to acquire the test current and / or the feedback signal. The data output terminal of the data acquisition unit is communicatively connected to the control unit, and is used to send the acquired data to the control unit for storage and processing.

8. The cold-pressed terminal short-circuit tester according to claim 1, characterized in that, The control unit also includes a human-machine interface port; The human-machine interface port is used to receive the preset target test current parameters input from the outside, and to display the waveform or value of the test current to the outside.

9. The cold-pressed terminal short-circuit tester according to claim 1, characterized in that, It also includes a loop test control module; The cyclic test control module is integrated into the control unit or communicates with the control unit as an independent module. The cyclic test control module is configured to: set a cyclic test current value lower than the short-circuit withstand current, as well as the number of cycles and time intervals, and drive the control unit to execute the output and shutdown of the target test current within each cycle.

10. The cold-pressed terminal short-circuit tester according to claim 6, characterized in that, The inductive voltage regulator is an oil-immersed inductive voltage regulator. The oil tank housing of the oil-immersed induction pressure regulator is equipped with an oil temperature monitoring interface; The oil temperature monitoring interface is connected to the fault detection terminal of the control unit or the safety protection unit, and is used to trigger an alarm or protection action when the oil temperature exceeds the threshold.

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