Handheld intelligent secondary equipment maintenance device and test method thereof

Abstract

The invention discloses a handheld intelligent secondary equipment maintenance device and a test method thereof. The handheld intelligent secondary equipment maintenance device comprises a core control module, a multi-parameter measurement module, a safety interlocking module, a communication module, a man-machine interaction module and a power management module, the core control module is used for coordinating and controlling multi-parameter synchronous acquisition and data processing; the safety interlocking module is used for constructing a real-time protection channel to realize safety logic judgment and risk early warning; the communication module is used for performing two-way transmission of test data and a control instruction; the multi-parameter measurement module is used for collecting electrical parameters of secondary equipment, and the power management module is used for providing a direct-current working power supply and monitoring the state of the power supply; and the man-machine interaction module is used for executing test parameter configuration, operation instruction input and test result display. Through cooperative work of all the modules, intelligentization, integration and safety of maintenance of the electric power secondary equipment are achieved.

Description

Technical Field

[0001] This application belongs to the field of power system secondary equipment maintenance technology, and particularly relates to a handheld intelligent secondary equipment maintenance device and its testing method. Background Technology

[0002] Currently, the maintenance of secondary power equipment is still mainly manual, resulting in problems such as low work efficiency, significant safety risks, weak data management, and insufficient standardization. Specifically, taking PT / CT secondary circuit testing as an example, traditional single-function instruments require frequent replacement, and the testing process relies on manual recording and step arrangement, with each operation taking 3-5 times longer than the industry's advanced level. Furthermore, redundant manual intervention leads to efficiency losses exceeding 60%. Short circuits and electric shocks caused by human errors such as incorrect wiring and live-line operations account for 12% of non-outage events in power plants. Traditional equipment lacks dynamic safety interlocking mechanisms, making it impossible to prevent dangerous operations in real time. Test data relies on manual entry into offline databases, and report compilation is time-consuming and error-prone, creating "data silos" that hinder equipment status assessment and decision optimization. Additionally, the parsing of work instructions and the generation of test sequences depend on manual operation, resulting in poor process standardization and low consistency of results.

[0003] While existing technological solutions have achieved intelligentization in some areas, significant limitations remain. Internationally, solutions from companies like GE and Siemens, such as Hitachi Energy's portable calibrator, only support automatic parameter acquisition; test sequences still require manual arrangement. OMICRON's CMC tester is highly complex to operate and unsuitable for rapid on-site maintenance. Safety interlock logic is based on preset rules, unable to dynamically match test scenarios, resulting in insufficient proactive protection capabilities. Furthermore, solutions like digital twins and industrial internet platforms are costly and difficult to adapt to the personalized needs of domestic power plants. Domestically, while Huaneng's iDAP platform has digitized some processes, the parsing of work instructions relies on manual annotation. The China Electric Power Research Institute's CT / PT calibration device lacks AI-based adaptive test sequence generation capabilities, and its safety interlock mechanism does not achieve dynamic matching. Additionally, the equipment integration is low, often employing a multi-device commissioning mode, making it difficult to balance portability and multifunctionality.

[0004] In summary, existing technologies have significant shortcomings in terms of process automation, dynamic safety protection, intelligent integration, and adaptability for secondary equipment maintenance. They cannot meet the needs of efficient, safe, and accurate maintenance on site. There is an urgent need to develop a portable maintenance device that integrates multi-parameter synchronous measurement, intelligent process arrangement, dynamic safety interlocking, and data closed-loop management. Summary of the Invention

[0005] The purpose of this application is to overcome the problems of the prior art by disclosing a handheld intelligent secondary equipment maintenance device and its testing method. This application realizes the intelligent, integrated and safe maintenance of power secondary equipment through the coordinated work of the core control module, multi-parameter measurement module, safety interlock module, communication module and human-machine interaction module.

[0006] On the one hand, the objective of this application is achieved through the following technical solution: A handheld intelligent secondary equipment maintenance device, comprising: a core control module, a multi-parameter measurement module, a safety interlock module, a communication module, a human-machine interaction module, and a power management module; The core control module is connected to the multi-parameter measurement module. The core control module is used to coordinate and control the synchronous acquisition and data processing of multiple parameters, while the multi-parameter measurement module is used to acquire the electrical parameters of the secondary equipment. The core control module is connected to the safety interlock module, which is used to build a real-time protection channel to realize security logic judgment and risk warning. The core control module is connected to the communication module, which is used for bidirectional transmission of test data and control commands. The human-computer interaction module is connected to the core control module, and the human-computer interaction module is used to perform test parameter configuration, operation command input and test result display; The power management module is electrically connected to the core control module, multi-parameter measurement module, safety interlock module, communication module and human-machine interaction module respectively. The power management module is used to provide DC working power and monitor the power status.

[0007] According to a preferred embodiment, the multi-parameter measurement module includes an AC voltage measurement unit, a DC voltage measurement unit, an AC current measurement unit, an insulation resistance measurement unit, and a signal conditioning circuit. The AC voltage measurement unit, DC voltage measurement unit, AC current measurement unit, and insulation resistance measurement unit are respectively connected to the signal conditioning circuit.

[0008] According to a preferred embodiment, the safety interlock module includes an overcurrent protection circuit, an overvoltage protection circuit, and a drive dead-time protection circuit. The output signals of the overcurrent protection circuit, overvoltage protection circuit, and drive dead zone protection circuit are all aggregated to the safety interlock module. After logical judgment by the safety interlock module, they form a closed-loop control with the core control module.

[0009] According to a preferred embodiment, the overcurrent protection circuit includes a current sensor, an RC filter circuit, and a comparator. The current sensor is connected in series to the output circuit of the maintenance device. The signal output terminal of the current sensor is connected to the safety interlock module through an RC filter circuit. After the detection signal of the current sensor is compared with the reference voltage by a comparator, a trigger signal is output to the safety interlock module.

[0010] According to a preferred embodiment, the overvoltage protection circuit includes a TVS diode, a varistor, a voltage sampling point, and a voltage divider resistor. The TVS diode and varistor are connected in parallel between the power input terminal of the maintenance device and the ground. The voltage sampling point is connected to the overvoltage protection circuit of the safety interlock module through a voltage divider resistor. When the overvoltage protection circuit detects that the voltage exceeds the threshold, it triggers the relay to cut off the main circuit and sends the overvoltage signal to the core control module.

[0011] According to a preferred embodiment, the safety interlock module further includes: a power drive unit, the power drive unit including a gate drive circuit and a hardware delay circuit, the drive dead-time protection circuit being integrated into the gate drive circuit of the power drive unit, and the drive dead-time protection circuit and the hardware delay circuit being connected. The drive dead-time protection circuit receives input signals from the safety interlock module, controls the dead time of the drive signal through a hardware delay circuit, and simultaneously transmits the drive status feedback signal back to the safety interlock module in real time. The dead time can be programmed and set through the core control module.

[0012] According to a preferred embodiment, the core control module has a built-in microcontroller, the multi-parameter measurement module has a built-in processing chip, and the communication module has a built-in dual-mode communication unit, which is used to support wired and wireless dual-mode communication.

[0013] According to a preferred embodiment, the human-computer interaction module includes a touch screen and physical operation buttons, and the human-computer interaction module is used to intuitively realize quick human-computer interaction operations.

[0014] On the other hand, this application also discloses: A testing method for a handheld intelligent secondary equipment maintenance device, the testing method comprising the following steps: S1: Generate RFID tags for the secondary equipment to be tested, read the RFID tags of the secondary equipment to be tested and obtain the equipment model information, call the pre-trained test model to parse the corresponding standardized operation instructions, and the core control module automatically generates the test item sequence. S2: According to the test item sequence, the sampling parameters of the multi-parameter measurement module are configured through the core control module. The sampling parameters include sampling rate, signal amplification factor and channel switching logic, and the time synchronization of each module is achieved through the communication protocol. S3: Time-division acquisition of voltage, current, phase and resistance parameters and generation of measurement values, storage of measurement values ​​in memory, and transmission of measurement values ​​to core control module; S4: Compare the measured value with a preset threshold and generate a judgment conclusion; S5: Generate a test report based on the judgment conclusion.

[0015] According to a preferred embodiment, the judgment conclusion in step S4 includes qualified, unqualified, and noteworthy, wherein the qualified judgment criterion is that the measured value is within ±5% of the standard threshold, the unqualified judgment criterion is that the measured value exceeds ±20% of the standard threshold, and the noteworthy judgment criterion is that the measured value is between ±5% and ±20% of the standard threshold.

[0016] The aforementioned main solution and its various further alternative solutions can be freely combined to form multiple solutions, all of which are solutions that can be adopted and are claimed in this application. Those skilled in the art, after understanding the solution of this application, will realize that there are many combinations based on the prior art and common general knowledge, all of which are technical solutions to be protected in this application, and will not be exhaustively listed here.

[0017] This device, through the coordinated operation of its core control module, multi-parameter measurement module, safety interlock module, communication module, and human-machine interaction module, achieves intelligent, integrated, and safe maintenance of secondary power equipment. Specific technical effects are as follows: The multi-parameter measurement module integrates AC voltage, DC voltage, AC current, and insulation resistance measurement units. Through the switching control of the analog switch array and signal conditioning circuit, combined with the bidirectional data interaction mechanism of the core control module, it achieves synchronous acquisition and fusion processing of multiple types of parameters, improving testing efficiency. The safety interlock module, by setting up overcurrent protection circuits, overvoltage protection circuits, and drive dead-zone protection circuits, receives real-time status signals from the safety interlock module. When dangerous conditions such as overcurrent or overvoltage are detected, it triggers a rapid disconnection of the output circuit, forcibly preventing malfunctions and ensuring the safe release of equipment energy before and after testing, significantly reducing the risk of short circuits and electric shock.

[0018] The core control module, based on the structured test sequence generated through parsing, controls the parameter switching and data acquisition of the multi-parameter measurement module. The communication module uploads the test data to the backend system, enabling real-time data display and interactive operation in conjunction with the human-machine interface module. Finally, a test report is output, forming a closed-loop data system of test-analysis-reporting, improving data traceability and management efficiency. In summary, this device, through the collaborative work of multiple modules, systematically solves the problems of low efficiency, high safety risks, and weak data management in traditional maintenance modes, achieving standardization, intelligentization, and safety upgrades to the secondary equipment maintenance process. Attached Figure Description

[0019] Figure 1This is a schematic diagram of the handheld intelligent secondary equipment maintenance device of this application; Figure 2 This is a schematic diagram of the test method for the handheld intelligent secondary equipment maintenance device of this application. Detailed Implementation

[0020] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. This application can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, unless otherwise specified, the following embodiments and features in the embodiments can be combined with each other.

[0021] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0022] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0023] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0024] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0025] Furthermore, it should be noted that unless otherwise specified in this application, the specific structures, connections, positions, power sources, etc. involved are all things that a person skilled in the art can know without creative effort based on the prior art.

[0026] Example 1 refer to Figure 1 As shown in the figure, this embodiment discloses a handheld intelligent secondary equipment maintenance device, including a core control module, a multi-parameter measurement module, a safety interlock module, a communication module, a human-machine interaction module, and a power management module.

[0027] The core control module is connected to a multi-parameter measurement module, which coordinates the synchronous acquisition and processing of multiple parameters. The multi-parameter measurement module is used to acquire electrical parameters of secondary equipment. The core control module is also connected to a safety interlock module, which establishes a real-time protection channel for safety logic judgment and risk warning. Furthermore, the core control module is connected to a communication module, which performs bidirectional transmission of test data and control commands. A human-machine interface module is connected to the core control module, which performs test parameter configuration, operation command input, and test result display. Finally, a power management module is electrically connected to the core control module, multi-parameter measurement module, safety interlock module, communication module, and human-machine interface module, providing DC power and monitoring power status.

[0028] Preferably, the core control module adopts an STM32F405RGT6 microcontroller, which is based on the ARM Cortex-M4 core, operates at a clock frequency of 168MHz, integrates a single-precision FPU unit and 1MB Flash memory, and externally expands 8GB eMMC flash memory for test data storage. The core control module can efficiently complete various control algorithms and data processing tasks, while supporting DSP instructions and FPU (floating-point unit), enabling rapid processing of complex mathematical operations and making it suitable for scenarios requiring real-time data processing. Flash memory execution supports zero-wait state, ensuring fast instruction reading and execution at different frequencies, improving system operating efficiency. The microcontroller has an FSMC interface, supporting external SRAM, NOR flash memory, and NAND flash memory, allowing for external storage expansion to meet large-capacity data storage needs. The microcontroller is equipped with two 12-bit, 2.4M SPS ADCs (16 channels in total), enabling high-precision acquisition of external analog signals, meeting signal sampling requirements in most scenarios and reducing the need for external ADCs. The microcontroller has rich peripheral interfaces, including multiple UART, SPI, and I2C communication interfaces, easily enabling connection to human-machine interface devices and communication with external Bluetooth, WIFI modules, sensors, and storage chips, providing a solid hardware foundation for device intelligence and networking.

[0029] Preferably, the multi-parameter measurement module uses the Analog Devices (ADI) 24-bit Σ-Δ ADC chip AD7768 for high-precision data acquisition. This chip has four built-in synchronous sampling channels, each with a sampling rate of up to 256kSPS, and transmits data to the core control module via an SPI interface. The chip operates on a single 5V power supply and has a built-in low-noise instrumentation amplifier (PGA) capable of 1-128x programmable gain adjustment, with a noise density as low as 16nV / Hz at a 10Hz output data rate. The synchronous sampling scheme adopts a master-slave clock architecture, with the core control module outputting a 10MHz system clock (CLKOUT) to drive the ADC. The SYNC signal is used to achieve phase synchronization between multiple modules, and the phase difference between channels is controlled within ±0.1°.

[0030] In the practical application of this embodiment, the multi-parameter measurement module includes an AC voltage measurement unit, a DC voltage measurement unit, an AC current measurement unit, an insulation resistance measurement unit, and a signal conditioning circuit. The AC voltage measurement unit, DC voltage measurement unit, AC current measurement unit, and insulation resistance measurement unit are respectively connected to the signal conditioning circuit.

[0031] In the practical application of this embodiment, the safety interlock module includes an overcurrent protection circuit, an overvoltage protection circuit, and a drive dead-zone protection circuit. The output signals of the overcurrent protection circuit, the overvoltage protection circuit, and the drive dead-zone protection circuit are all aggregated to the safety interlock module. After logical judgment by the safety interlock module, a closed-loop control is formed with the core control module.

[0032] The core protection circuit of the safety interlock module is controlled by an independent STM32F030C8T6 monitoring chip, forming a dual MCU architecture with the core control module. The overcurrent protection circuit uses a LEM LA55-P current sensor (measurement range 0-500A). The sensor output signal is conditioned by an OPA2333 operational amplifier and then fed into a comparator LM393. When the detected current exceeds 440A (the threshold is adjustable via a 10kΩ precision potentiometer), the comparator outputs a low level, triggering the hardware protection relay to operate and disconnecting the test circuit. The protection response time is controlled within the range of 200μs ± 50μs by an RC filter circuit (R = 1kΩ, C = 100nF).

[0033] In the practical application of this embodiment, the overcurrent protection circuit includes a current sensor, an RC filter circuit, and a comparator. The current sensor is connected in series to the output circuit of the maintenance device. The signal output terminal of the current sensor is connected to the safety interlock module through the RC filter circuit. After the detection signal of the current sensor is compared with the reference voltage by the comparator, a trigger signal is output to the safety interlock module.

[0034] In the practical application of this embodiment, the overvoltage protection circuit includes a TVS diode, a varistor, a voltage sampling point, and a voltage divider resistor. The TVS diode and the varistor are connected in parallel between the power input terminal of the maintenance device and ground. The voltage sampling point is connected to the overvoltage protection circuit of the safety interlock module through the voltage divider resistor. When the overvoltage protection circuit detects that the voltage exceeds the threshold, it triggers a relay to cut off the main circuit and sends the overvoltage signal to the core control module.

[0035] In the practical application of this embodiment, the safety interlock module further includes a power drive unit, which includes a gate drive circuit and a hardware delay circuit. The drive dead-time protection circuit is integrated into the gate drive circuit of the power drive unit, and the drive dead-time protection circuit and the hardware delay circuit are connected. The drive dead-time protection circuit receives input signals from the safety interlock module, controls the dead time of the drive signal through a hardware delay circuit, and simultaneously transmits the drive status feedback signal back to the safety interlock module in real time. The dead time can be programmed and set through the core control module.

[0036] In the practical application of this embodiment, the core control module has a built-in microcontroller, the multi-parameter measurement module has a built-in processing chip, and the communication module has a built-in dual-mode communication unit, which is used to support wired and wireless dual-mode communication.

[0037] Specifically, the wired communication of the dual-mode communication unit uses an Ethernet interface with a transmission rate of 100Mbps; the wireless communication supports Wi-Fi 802.11b / g / n protocol and Bluetooth 5.0 protocol, with a wireless transmission distance of ≥100m, and the communication protocol uses MQTT protocol to realize data interaction between devices.

[0038] In the practical application of this embodiment, the human-computer interaction module includes a touch screen and physical operation buttons, and the human-computer interaction module is used to intuitively realize quick human-computer interaction operations.

[0039] Specifically, the human-computer interaction module includes a 7-inch touchscreen and physical operation buttons. The touchscreen has a resolution of 1280×800, supports multi-touch, and has a response time of ≤100ms. The physical operation buttons include a power button, an emergency stop button, and function shortcut keys. It adopts a waterproof and dustproof design with a protection level of IP54.

[0040] In this embodiment, the device achieves intelligent, integrated, and safe maintenance of secondary power equipment through the coordinated operation of the core control module, multi-parameter measurement module, safety interlock module, communication module, and human-machine interaction module. The multi-parameter measurement module integrates AC voltage, DC voltage, AC current, and insulation resistance measurement units. Through the switching control of the analog switch array and signal conditioning circuit, combined with the bidirectional data interaction mechanism of the core control module, it realizes the synchronous acquisition and fusion processing of multiple types of parameters, thereby improving testing efficiency.

[0041] The safety interlock module is equipped with overcurrent protection circuit, overvoltage protection circuit and drive dead zone protection circuit. The core control module receives the status signal of the safety interlock module in real time. When dangerous conditions such as overcurrent and overvoltage are detected, it triggers the rapid cut-off of the output circuit to forcibly block malfunctions, ensuring the safe release of equipment energy before and after testing, and significantly reducing the risk of short circuit and electric shock.

[0042] The core control module, based on the structured test sequence generated through parsing, controls the parameter switching and data acquisition of the multi-parameter measurement module. The communication module uploads the test data to the backend system, enabling real-time data display and interactive operation in conjunction with the human-machine interface module. Finally, a test report is output, forming a closed-loop data system of test-analysis-reporting, improving data traceability and management efficiency. In summary, this device, through the collaborative work of multiple modules, systematically solves the problems of low efficiency, high safety risks, and weak data management in traditional maintenance modes, achieving standardization, intelligentization, and safety upgrades to the secondary equipment maintenance process.

[0043] Example 2 like Figure 2 As shown in Example 1, this example discloses a testing method for a handheld intelligent secondary equipment maintenance device, which includes the following steps.

[0044] Step S1: Generate the RFID tag of the secondary equipment to be tested, read the RFID tag of the secondary equipment to be tested and obtain the equipment model information, call the pre-trained test model to parse the corresponding standardized operation instructions, and the core control module automatically generates the test item sequence.

[0045] Step S2: According to the test item sequence, configure the sampling parameters of the multi-parameter measurement module through the core control module. The sampling parameters include sampling rate, signal amplification factor and channel switching logic, and realize time synchronization of each module through communication protocol.

[0046] Step S3: Time-division acquisition of voltage, current, phase and resistance parameters and generation of measurement values, storage of measurement values ​​in memory, and transmission of measurement values ​​to core control module by memory.

[0047] Step S4: Compare the measured value with the preset threshold and generate a judgment conclusion.

[0048] Step S5: Generate a test report based on the judgment conclusion.

[0049] In the practical application of this embodiment, the judgment conclusion in step S4 includes qualified, unqualified, and note. The qualified judgment standard is that the measured value is within ±5% of the standard threshold, the unqualified judgment standard is that the measured value exceeds ±20% of the standard threshold, and the note judgment standard is that the measured value is between ±5% and ±20% of the standard threshold.

[0050] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A handheld intelligent secondary equipment maintenance device, characterized in that, The handheld intelligent secondary equipment maintenance device includes: a core control module, a multi-parameter measurement module, a safety interlock module, a communication module, a human-machine interaction module, and a power management module. The core control module is connected to the multi-parameter measurement module. The core control module is used to coordinate and control the synchronous acquisition and data processing of multiple parameters, while the multi-parameter measurement module is used to acquire the electrical parameters of the secondary equipment. The core control module is connected to the safety interlock module, which is used to build a real-time protection channel to realize security logic judgment and risk warning. The core control module is connected to the communication module, which is used for bidirectional transmission of test data and control commands. The human-computer interaction module is connected to the core control module, and the human-computer interaction module is used to perform test parameter configuration, operation command input and test result display; The power management module is electrically connected to the core control module, multi-parameter measurement module, safety interlock module, communication module and human-machine interaction module respectively. The power management module is used to provide DC working power and monitor the power status.

2. The handheld intelligent secondary equipment maintenance device as described in claim 1, characterized in that, The multi-parameter measurement module includes an AC voltage measurement unit, a DC voltage measurement unit, an AC current measurement unit, an insulation resistance measurement unit, and a signal conditioning circuit. The AC voltage measurement unit, DC voltage measurement unit, AC current measurement unit, and insulation resistance measurement unit are respectively connected to the signal conditioning circuit.

3. The handheld intelligent secondary equipment maintenance device as described in claim 1, characterized in that, The safety interlock module includes an overcurrent protection circuit, an overvoltage protection circuit, and a drive dead-time protection circuit. The output signals of the overcurrent protection circuit, overvoltage protection circuit, and drive dead zone protection circuit are all aggregated to the safety interlock module. After logical judgment by the safety interlock module, they form a closed-loop control with the core control module.

4. The handheld intelligent secondary equipment maintenance device as described in claim 3, characterized in that, The overcurrent protection circuit includes a current sensor, an RC filter circuit, and a comparator. The current sensor is connected in series to the output circuit of the maintenance device. The signal output terminal of the current sensor is connected to the safety interlock module through an RC filter circuit. After the detection signal of the current sensor is compared with the reference voltage by a comparator, a trigger signal is output to the safety interlock module.

5. The handheld intelligent secondary equipment maintenance device as described in claim 3, characterized in that, The overvoltage protection circuit includes a TVS diode, a varistor, a voltage sampling point, and a voltage divider resistor. The TVS diode and varistor are connected in parallel between the power input terminal of the maintenance device and the ground. The voltage sampling point is connected to the overvoltage protection circuit of the safety interlock module through a voltage divider resistor. When the overvoltage protection circuit detects that the voltage exceeds the threshold, it triggers the relay to cut off the main circuit and sends the overvoltage signal to the core control module.

6. The handheld intelligent secondary equipment maintenance device as described in claim 3, characterized in that, The safety interlock module further includes: a power drive unit, which includes a gate drive circuit and a hardware delay circuit. The drive dead-time protection circuit is integrated into the gate drive circuit of the power drive unit, and the drive dead-time protection circuit and the hardware delay circuit are connected. The drive dead-time protection circuit receives input signals from the safety interlock module, controls the dead time of the drive signal through a hardware delay circuit, and simultaneously transmits the drive status feedback signal back to the safety interlock module in real time. The dead time can be programmed and set through the core control module.

7. The handheld intelligent secondary equipment maintenance device as described in claim 1, characterized in that, The core control module has a built-in microcontroller, the multi-parameter measurement module has a built-in processing chip, and the communication module has a built-in dual-mode communication unit, which is used to support wired and wireless dual-mode communication.

8. The handheld intelligent secondary equipment maintenance device as described in claim 1, characterized in that, The human-computer interaction module includes a touch screen and physical operation buttons, and is used to intuitively realize quick human-computer interaction operations.

9. A testing method for a handheld intelligent secondary equipment maintenance device as described in any one of claims 1 to 8, characterized in that, The testing method includes the following steps: S1: Generate RFID tags for the secondary equipment to be tested, read the RFID tags of the secondary equipment to be tested and obtain the equipment model information, call the pre-trained test model to parse the corresponding standardized operation instructions, and the core control module automatically generates the test item sequence. S2: According to the test item sequence, the sampling parameters of the multi-parameter measurement module are configured through the core control module. The sampling parameters include sampling rate, signal amplification factor and channel switching logic, and the time synchronization of each module is achieved through the communication protocol. S3: Time-division acquisition of voltage, current, phase and resistance parameters and generation of measurement values, storage of measurement values ​​in memory, and transmission of measurement values ​​to core control module; S4: Compare the measured value with a preset threshold and generate a judgment conclusion; S5: Generate a test report based on the judgment conclusion.

10. The test method according to claim 9, characterized in that, The judgment conclusion in step S4 includes qualified, unqualified, and noteworthy. The pass / fail criterion is that the measured value is within ±5% of the standard threshold, the fail / unacceptable criterion is that the measured value exceeds ±20% of the standard threshold, and the noteworthy criterion is that the measured value is between ±5% and ±20% of the standard threshold.

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