Intelligent interface matrix for integrated test of power transformer

Abstract

The invention provides an intelligent interface matrix for an integrated test of a power transformer, and aims to simplify complex wiring operation in a traditional test and improve the automation level and the working efficiency of test wiring of the power transformer. The intelligent interface matrix is composed of an intelligent control module, a test interface unit and a sensing monitoring module, and supports wiring tasks of conventional tests of dielectric loss, excitation characteristics, loop resistance, primary and secondary DC resistance of a current transformer, transformation ratio, dielectric loss, insulation resistance and the like of a voltage transformer. Signals such as voltage and current in a test are monitored in real time, the intelligent interface matrix automatically identifies the type of the power transformer, a test sequence is preset according to different types of transformers, a plurality of adjustable test interface units are stably and safely switched in a high-voltage and large-current environment, various test wiring work is efficiently and rapidly completed, and the test efficiency is improved. Manual intervention is remarkably reduced, and the test safety, reliability and overall working efficiency are effectively improved.

Description

Technical Field

[0001] The present invention relates to the field of power equipment testing, and more particularly to an intelligent interface matrix for integrated testing of power transformers. Background Art

[0002] In power systems, current transformers (CTs) and voltage transformers (PTs) are key measurement and protection devices. Their accuracy, stability, and reliability directly impact the safe operation of the power system and the accuracy of energy metering. To ensure that transformer performance meets standards, a series of routine tests, including dielectric loss tests, excitation characteristics tests, loop resistance tests, turns ratio tests, and insulation resistance tests, must be regularly performed. However, traditional transformer testing methods have the following problems: (1) The test process is cumbersome and inefficient: Currently, power transformer tests usually rely on a variety of dedicated test instruments. Each test item requires separate wiring, and operators need to manually change test equipment and adjust wiring methods according to different test requirements. This process is not only time-consuming, but also increases the complexity of the test, resulting in low overall efficiency.

[0003] (2) Manual wiring is prone to errors, affecting the accuracy of the test: Since the test wiring involves multiple sets of test cables, operators need to frequently plug and unplug and adjust the wiring, which can easily lead to wiring errors due to human negligence, thereby affecting the accuracy of the test data and even damaging the equipment or endangering personal safety due to misoperation.

[0004] (3) Multiple devices and inconvenient on-site operation: Different test items require different test instruments. During on-site testing, multiple devices need to be carried and the wiring method needs to be changed repeatedly, which increases the complexity of the test and the probability of error caused by manual intervention. In addition, in harsh on-site environments (such as high voltage, high humidity or confined space), manual wiring is even more difficult, further reducing the reliability and safety of the test. Summary of the Invention

[0005] In response to the technical problems existing in the prior art, the present invention provides an intelligent interface matrix for integrated testing of power transformers, which can automatically adapt to the wiring requirements of different test items, reduce manual intervention, improve test efficiency and accuracy, and ensure the safety and reliability of the test process.

[0006] The present invention proposes an intelligent interface matrix for integrated testing of power transformers, comprising an intelligent control module, a test interface unit, and a sensor monitoring module. The intelligent control module comprises a power module and a micro edge computer, the power module supplies power to the micro edge computer, the test interface unit comprises a plurality of test interfaces, the micro edge computer is connected to each test interface via an electrical connection line, the micro edge computer is connected to the sensor monitoring module via a signal transmission line, each test interface is connected to the power transformer via an electrical connection line, and the sensor monitoring module is connected to each test interface via an electrical connection line. The sensor monitoring module is used to collect the voltage signal and current signal of the primary side and the secondary side of the power transformer after the intelligent interface matrix is connected to the power transformer, and transmit them to the intelligent control module; The intelligent control module is used to identify the type of the power transformer based on the voltage signals and current signals on the primary and secondary sides of the power transformer; and to obtain a preset test sequence and test time of the power transformer based on the identified type of the power transformer; and is also used to control the on-off sequence and on-off time of each test interface in the test interface unit according to the preset test sequence and test time of the power transformer to perform corresponding tests on the power transformer.

[0007] On the basis of the above technical solution, the present invention can also make the following improvements.

[0008] Optionally, the sensing monitoring module includes a current sensor and a voltage sensor; The AC current sensor is used to collect current data on the primary and secondary sides of the power transformer, and transmit the current data on the primary and secondary sides of the power transformer to the intelligent control module through a signal transmission line; The AC voltage sensor is used to collect voltage data on the primary side and the secondary side of the power transformer, and transmit the voltage data on the primary side and the secondary side of the power transformer to the intelligent control module through a signal transmission line.

[0009] Optionally, the sensing monitoring module includes a plurality of current sensors and a plurality of voltage sensors, the micro edge computer includes a plurality of I / O interfaces, and the micro edge computer is connected to each of the current sensors and each of the voltage sensors through the I / O interfaces; Multiple current sensors and multiple AC voltage sensors are used to collect current data and voltage data of different levels output by the primary and secondary sides of the power transformer during the test, and transmit the collected current data and voltage data of the primary and secondary sides of the power transformer to the intelligent control module through the corresponding I / O interface.

[0010] Optionally, the voltage sensor has a measurement range of 100-400V and an accuracy of ±0.5%; the current sensor has a measurement range of 1-50A and an accuracy of ±0.5%; and both the voltage sensor and the current sensor support an AC frequency of 50HZ or 60HZ.

[0011] Optionally, the intelligent control module is configured to identify the type of the power transformer based on the voltage signal and the current signal on the primary side and the secondary side of the power transformer, including: The intelligent control module calculates the primary side impedance value and the secondary side impedance value of the power transformer according to the voltage signal and the current signal of the primary side and the secondary side of the power transformer, and identifies the type of the power transformer according to the primary side impedance value and the secondary side impedance value of the power transformer.

[0012] Optionally, identifying the type of the power transformer according to the primary side impedance value and the secondary side impedance value of the power transformer includes: When the primary side impedance value of the power transformer is less than a first preset threshold value and the secondary side impedance value is less than a second preset threshold value, determining that the power transformer is a current transformer; When the primary side impedance value of the power transformer is greater than a first preset threshold value and the secondary side impedance value is less than a second preset threshold value, it is determined that the power transformer is a voltage transformer.

[0013] Optionally, obtaining a preset test sequence and test time of the power transformer according to the identified type of the power transformer includes: If the power transformer is a current transformer, the test sequence of the current transformer is loop resistance test, primary and secondary direct resistance test, excitation characteristics test and dielectric loss test, and the duration of each test should be set; If the power transformer is a voltage transformer, the test sequence of the voltage transformer is insulation resistance test, transformation ratio test and dielectric loss test, and the duration of each test is set.

[0014] Optionally, the test interface unit includes a current transformer dielectric loss test interface, a current transformer excitation characteristic test interface, a current transformer loop resistance test interface, a current transformer primary and secondary direct resistance test interface, a voltage transformer dielectric loss test interface, a voltage transformer ratio test interface, and a voltage transformer insulation resistance test interface, and electrical isolation is adopted between each test interface; The current transformer dielectric loss test interface, the current transformer excitation characteristic test interface, the current transformer loop resistance test interface and the current transformer primary and secondary direct resistance test interface are all connected to the current transformer through electrical connecting lines, and the voltage transformer dielectric loss test interface, the voltage transformer ratio test interface and the voltage transformer insulation resistance test interface are all connected to the voltage transformer through electrical connecting lines.

[0015] Optionally, each test interface is equipped with a controllable switch that meets the corresponding voltage level, which is used to control the on-off of the electrical connection line between the test interface and the power transformer. The on-off sequence and on-off time of each test interface in the test interface unit are controlled according to the pre-set test sequence and test time of the power transformer to perform the corresponding test on the power transformer, including: The intelligent control module is used to send an on-off instruction to the corresponding controllable switch according to the preset test sequence and test time of the power transformer, so that the controllable switch controls the on-off of the electrical connection line between the corresponding test interface and the power transformer according to the on-off instruction.

[0016] Optionally, the intelligent control module, the test interface unit and the sensor monitoring module are detachable.

[0017] The present invention provides an intelligent interface matrix for integrated testing of power transformers. The intelligent interface matrix is composed of an intelligent control module, a test interface unit, and a sensor monitoring module. It supports the completion of wiring tasks for conventional tests such as current transformer dielectric loss, excitation characteristics, loop resistance, primary and secondary direct resistance, and voltage transformer ratio, dielectric loss, and insulation resistance. After the connection with the power transformer is completed, the intelligent interface matrix automatically identifies the type of power transformer by real-time monitoring of voltage, current and other signals in the test. According to the predetermined test sequence of different types of transformers, multiple adjustable test interface units are stably and safely switched in a high voltage and high current environment, completing various test wiring tasks efficiently and quickly. The present invention significantly improves the intelligence and automation level of power transformer test wiring by integrating real-time monitoring of voltage and current signals, transformer type identification, and automatic switching of test interfaces in the same interface module, thereby ensuring efficient, stable, and safe operation of the test process. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A structural block diagram of an intelligent interface matrix for integrated power transformer testing provided by an embodiment of the present invention; Figure 2 Flowchart for identifying power transformer types; Figure 3 The diagram is a connection diagram of each test interface with current transformer and voltage transformer; Figure 4 Schematic diagram of the modular structure of the intelligent interface matrix according to an embodiment of the present invention. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. In addition, the technical features in the various embodiments or single embodiments provided by the present invention can be arbitrarily combined with each other to form a feasible technical solution. This combination is not restricted by the sequence of steps and / or structural composition mode, but must be based on the ability of ordinary technicians in this field to implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0020] The traditional transformer test process has complex wiring, frequent manual intervention, low test efficiency, high error rate, and certain safety risks. Especially when multiple tests are carried out continuously, manual wire replacement is not only time-consuming but also prone to wiring errors, seriously affecting test accuracy and system safety.

[0021] Based on the above problems, the embodiment of the present invention provides an intelligent interface matrix for integrated testing of power transformers, such as Figure 1 As shown, the intelligent interface matrix includes an intelligent control module, a test interface unit and a sensor monitoring module. The intelligent control module includes a power supply module and a micro edge computer. The power supply module supplies power to the micro edge computer. The test interface unit includes multiple test interfaces. The micro edge computer is connected to each test interface through an electrical connection line. The micro edge computer is connected to the sensor monitoring module through a signal transmission line. Each test interface is connected to the power transformer through an electrical connection line. The sensor monitoring module is connected to each test interface through an electrical connection line.

[0022] It is understandable that the three core modules of the intelligent interface matrix, the intelligent control module, the test interface unit and the sensor monitoring module, are interconnected through electrical connection lines and signal transmission lines to form a complete signal acquisition, control identification and interface switching closed-loop system, realizing the automated test wiring process and achieving automatic operation and logical closed loop of the entire test wiring process. The working principles of each module are as follows: The sensor monitoring module is used to collect the voltage signal and current signal of the primary side and the secondary side of the power transformer after the intelligent interface matrix is connected to the power transformer, and transmit them to the intelligent control module; The intelligent control module is used to identify the type of the power transformer based on the voltage signals and current signals on the primary and secondary sides of the power transformer; and to obtain a preset test sequence and test time of the power transformer based on the identified type of the power transformer; and is also used to control the on-off sequence and on-off time of each test interface in the test interface unit according to the preset test sequence and test time of the power transformer to perform corresponding tests on the power transformer.

[0023] In one embodiment of the present invention, the sensing monitoring module includes a current sensor and a voltage sensor; the AC current sensor is used to collect current data on the primary and secondary sides of the power transformer, and transmit the current data on the primary and secondary sides of the power transformer to the intelligent control module through a signal transmission line; the AC voltage sensor is used to collect voltage data on the primary and secondary sides of the power transformer, and transmit the voltage data on the primary and secondary sides of the power transformer to the intelligent control module through a signal transmission line.

[0024] Among them, the sensor monitoring module may include multiple current sensors and multiple voltage sensors; the micro edge computer includes multiple I / O interfaces, and the micro edge computer is connected to each current sensor and each voltage sensor through the I / O interface. During the test of the power transformer, since the excitation power supply of the power transformer has different voltage levels, the voltage level output by the power transformer will also be different after the power transformer is tested. Therefore, the embodiment of the present invention sets multiple current sensors and voltage sensors of different levels in the sensor monitoring module, collects current data and voltage data of different levels output from the primary and secondary sides of the power transformer, and transmits the collected current data and voltage data of the primary and secondary sides of the power transformer to the intelligent control module through the corresponding I / O interface.

[0025] For example, in one embodiment of the present invention, the sensor monitoring module can integrate two current sensors and two voltage sensors. The voltage sensors have high input impedance, a measurement range of 100–400V, and an accuracy of ±0.5%. The current sensors have a measurement range of 1–50A and an accuracy of ±0.5%. Both the voltage and current sensors support 50Hz / 60Hz grid frequencies, provide overload protection, and suppress electromagnetic and radio frequency interference. They output digital signals for analysis and calculation by the intelligent control module.

[0026] In one embodiment of the present invention, the intelligent control module is configured to identify the type of the power transformer based on the voltage signal and the current signal on the primary side and the secondary side of the power transformer, including: The intelligent control module calculates the primary side impedance value and the secondary side impedance value of the power transformer according to the voltage signal and the current signal of the primary side and the secondary side of the power transformer, and identifies the type of the power transformer according to the primary side impedance value and the secondary side impedance value of the power transformer.

[0027] Among them, when the primary side impedance value of the power transformer is less than the first preset threshold and the secondary side impedance value is less than the second preset threshold, the power transformer is judged to be a current transformer; when the primary side impedance value of the power transformer is greater than the first preset threshold and the secondary side impedance value is less than the second preset threshold, the power transformer is judged to be a voltage transformer.

[0028] It is understandable that the intelligent control module has a built-in micro-edge computer, and the micro-edge computer is powered by a stable power supply module. The micro-edge computer has a multi-channel I / O interface for collecting data from the sensor monitoring module. The micro-edge computer has a built-in high-speed processing chip for real-time analysis of voltage and current. By writing programs, the test process logic control, automatic identification of power transformer types, test time management, control signal output and other functions can be realized. The micro-edge computer is connected to the sensor monitoring module to receive voltage and current data from the voltage sensor and current sensor in real time, further analyze the voltage and current signals on the primary and secondary sides of the power transformer, calculate the impedance values on the primary and secondary sides of the power transformer, and identify the transformer type. The specific identification logic flow chart is as follows: Figure 2 shown.

[0029] Specifically, the micro-edge computer quickly calculates the primary and secondary impedance values of the power transformer by analyzing the voltage and current characteristic parameters of the power transformer, and automatically determines the type of the connected power transformer: if the primary and secondary impedance values are both very small, it is identified as a current transformer (CT); if the primary impedance value is large and the secondary impedance value is very small, it is identified as a voltage transformer (PT), realizing plug-and-play automatic identification and configuration without the need for human intervention.

[0030] Among them, the micro edge computer is pre-set with test sequences and time settings for different transformer types. The corresponding test process logic is called according to the identification results. The intelligent control module automatically outputs control signals to drive the controllable switch array in the test interface unit, so that the current power transformer is connected to the corresponding test interface unit, realizing fully automated configuration and switching of the test wiring.

[0031] The test sequence and test time for the current transformer are: loop resistance test (1 second) → primary and secondary direct resistance test (1 second) → excitation characteristics test (1 minute) → dielectric loss test (30 seconds); the test sequence and test time for the voltage transformer are: insulation resistance test (1 minute) → transformation ratio test (30 seconds) → dielectric loss test (30 seconds).

[0032] Among them, the test interface unit contains multiple independent test channels, which correspond to the test requirements of different types of transformers. The test interface units include current transformer dielectric loss test interface unit, excitation characteristic test interface unit, loop resistance test interface unit, and primary and secondary direct resistance test interface unit. They are all connected to the current transformer through electrical connection lines to realize various tests on the current transformer. The test interface unit also includes voltage transformer dielectric loss test interface unit, ratio test interface unit, and insulation resistance test interface unit. These test interfaces are all connected to the voltage transformer through electrical connection lines to realize various tests on the voltage transformer. These test interface units adopt an electrical isolation design to ensure safe operation in high voltage and high current environments. Each interface unit is integrated with a controllable switch and overcurrent protection circuit that matches its voltage / current level. It switches to the corresponding test circuit according to the instructions of the micro-edge computer, such as Figure 3 As shown, the fully automatic configuration of the test wiring is achieved.

[0033] During the power transformer testing process, each test interface is equipped with a controllable switch that meets the corresponding voltage level and is used to control the on / off of the electrical connection line between the test interface and the power transformer. The intelligent control module is used to send on / off instructions to the corresponding controllable switch according to the preset power transformer test sequence and test time, so that the controllable switch controls the on / off of the electrical connection line between the corresponding test interface and the power transformer according to the on / off instructions, thereby implementing various tests on the current transformer and voltage transformer according to the current transformer test sequence and the voltage transformer test sequence.

[0034] The workflow of the embodiment of the present invention is as follows: (1) The operator connects the power transformer to the corresponding input terminal of the intelligent interface module; (2) After the system is powered on, the sensor monitoring module collects the voltage and current signals of the primary and secondary sides of the power transformer in real time and sends them to the intelligent control module; (3) The intelligent control module identifies whether the current power transformer is a current transformer CT or a voltage transformer PT by calculating the primary side impedance value and the secondary side impedance value of the power transformer; (4) The micro-edge computer calls the preset test sequence: if it is a current transformer CT, the current transformer is tested in the order of loop resistance test → primary and secondary DC resistance test → excitation characteristic test → dielectric loss test; if it is a voltage transformer PT, the voltage transformer is tested in the order of insulation resistance test → transformation ratio test → dielectric loss test.

[0035] (5) The micro-edge computer sends a control signal to drive the controllable switches of the test interface units to close in turn, switching to the corresponding test interface units to connect with the power transformers, and then testing the power transformers in turn.

[0036] Among them, such as Figure 4 As shown, this embodiment of the present invention utilizes a highly modular design. All modules (intelligent control module, sensor monitoring module, and test interface unit) are relatively independent, ensuring excellent compatibility and maintainability. Each module can be individually disassembled, replaced, or upgraded. This ensures that during field maintenance or system upgrades, only the faulty module needs to be replaced, eliminating the need to completely replace the entire device, significantly reducing operational costs. To ensure equipment safety, electrical isolation technology is used between the test interface units, and they are encapsulated with high-voltage, high-current insulating materials to ensure system stability and reliability in harsh test environments.

[0037] The intelligent interface matrix provided by the present invention is applicable in locations including, but not limited to, substations, power equipment manufacturers, testing agencies, and power companies. It is particularly well-suited for periodic testing and batch production testing of power transformers. Through intelligent, automated wiring, it significantly improves test efficiency, reduces operational errors, and mitigates safety risks, while ensuring accurate test data and long-term stable equipment operation.

[0038] The present invention provides an intelligent interface matrix for integrated testing of power transformers, which has the following beneficial effects: 1. Realize the automation and intelligent control of the power transformer test wiring process, significantly reduce the intensity of manual operation, reduce the incidence of wiring errors, and improve test efficiency and operational safety.

[0039] 2. Automatically identify the transformer type based on the primary and secondary impedance values of the power transformer, realize plug-and-play transformer access, without manual configuration, and adapt to the rapid identification and switching of various types of transformers.

[0040] 3. The system adopts a highly modular design, supports the disassembly and replacement of independent units, facilitates subsequent maintenance and function expansion, and enhances the sustainable operation capability and adaptability of the equipment.

[0041] 4. Key components are made of insulating materials with high voltage resistance and high current carrying capacity, supplemented by electrical isolation protection design to ensure the equipment safety and personnel safety of the system under high voltage and high current conditions.

[0042] It should be noted that, in the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant description of other embodiments.

[0043] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Thus, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0044] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowcharts and / or block diagrams, as well as combinations of processes and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded computer, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowcharts and / or block diagrams. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0045] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0046] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0047] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0048] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. An intelligent interface matrix for integrated testing of power transformers, characterized in that: It includes an intelligent control module, a test interface unit and a sensor monitoring module, wherein the intelligent control module includes a power module and a micro edge computer, the power module supplies power to the micro edge computer, the test interface unit includes multiple test interfaces, the micro edge computer is connected to each test interface through an electrical connection line, the micro edge computer is connected to the sensor monitoring module through a signal transmission line, each test interface is connected to a power transformer through an electrical connection line, and the sensor monitoring module is connected to each test interface through an electrical connection line; The sensor monitoring module is used to collect the voltage signal and current signal of the primary side and the secondary side of the power transformer after the intelligent interface matrix is connected to the power transformer, and transmit them to the intelligent control module; The intelligent control module is configured to identify the type of the power transformer based on the voltage signal and the current signal on the primary side and the secondary side of the power transformer; and obtain a preset test sequence and test time of the power transformer based on the identified type of the power transformer; It is also used to control the on-off sequence and on-off time of each test interface in the test interface unit according to the preset test sequence and test time of the power transformer, so as to perform corresponding tests on the power transformer.

2. The intelligent interface matrix according to claim 1, characterized in that: The sensing monitoring module includes a current sensor and a voltage sensor; The AC current sensor is used to collect current data on the primary and secondary sides of the power transformer, and transmit the current data on the primary and secondary sides of the power transformer to the intelligent control module through a signal transmission line; The AC voltage sensor is used to collect voltage data on the primary side and the secondary side of the power transformer, and transmit the voltage data on the primary side and the secondary side of the power transformer to the intelligent control module through a signal transmission line.

3. The intelligent interface matrix according to claim 1, characterized in that: The sensor monitoring module includes a plurality of current sensors and a plurality of voltage sensors, and the micro edge computer includes a plurality of I / O interfaces, and the micro edge computer is connected to each of the current sensors and each of the voltage sensors through the I / O interfaces; Multiple current sensors and multiple AC voltage sensors are used to collect current data and voltage data of different levels output by the primary and secondary sides of the power transformer during the test, and transmit the collected current data and voltage data of the primary and secondary sides of the power transformer to the intelligent control module through the corresponding I / O interface.

4. The intelligent interface matrix according to claim 2 or 3, characterized in that: The voltage sensor has a measurement range of 100-400V and an accuracy of ±0.5%; the current sensor has a measurement range of 1-50A and an accuracy of ±0.5%; both the voltage sensor and the current sensor support an AC frequency of 50HZ or 60HZ.

5. The intelligent interface matrix according to claim 1, characterized in that: The intelligent control module is used to identify the type of the power transformer according to the voltage signal and the current signal on the primary side and the secondary side of the power transformer, including: The intelligent control module calculates the primary side impedance value and the secondary side impedance value of the power transformer according to the voltage signal and the current signal of the primary side and the secondary side of the power transformer, and identifies the type of the power transformer according to the primary side impedance value and the secondary side impedance value of the power transformer.

6. The intelligent interface matrix according to claim 5, characterized in that: The identifying the type of the power transformer according to the primary side impedance value and the secondary side impedance value of the power transformer includes: When the primary side impedance value of the power transformer is less than a first preset threshold value and the secondary side impedance value is less than a second preset threshold value, determining that the power transformer is a current transformer; When the primary side impedance value of the power transformer is greater than a first preset threshold value and the secondary side impedance value is less than a second preset threshold value, it is determined that the power transformer is a voltage transformer.

7. The intelligent interface matrix according to claim 6, characterized in that: The step of obtaining a preset test sequence and test time of the power transformer according to the identified type of the power transformer includes: If the power transformer is a current transformer, the test sequence of the current transformer is loop resistance test, primary and secondary direct resistance test, excitation characteristics test and dielectric loss test, and the duration of each test should be set; If the power transformer is a voltage transformer, the test sequence of the voltage transformer is insulation resistance test, transformation ratio test and dielectric loss test, and the duration of each test is set.

8. The intelligent interface matrix according to claim 7, characterized in that: The test interface unit includes a current transformer dielectric loss test interface, a current transformer excitation characteristic test interface, a current transformer loop resistance test interface, a current transformer primary and secondary direct resistance test interface, a voltage transformer dielectric loss test interface, a voltage transformer ratio test interface, and a voltage transformer insulation resistance test interface, and electrical isolation is adopted between each test interface; The current transformer dielectric loss test interface, the current transformer excitation characteristic test interface, the current transformer loop resistance test interface and the current transformer primary and secondary direct resistance test interface are all connected to the current transformer through electrical connecting lines, and the voltage transformer dielectric loss test interface, the voltage transformer ratio test interface and the voltage transformer insulation resistance test interface are all connected to the voltage transformer through electrical connecting lines.

9. The intelligent interface matrix according to claim 1, characterized in that: Each test interface is equipped with a controllable switch that meets the corresponding voltage level, which is used to control the on-off of the electrical connection line between the power transformer and the test interface unit. The on-off sequence and on-off time of each test interface in the test interface unit are controlled according to the pre-set test sequence and test time of the power transformer to perform the corresponding test on the power transformer, including: The intelligent control module is used to send an on-off instruction to the corresponding controllable switch according to the preset test sequence and test time of the power transformer, so that the controllable switch controls the on-off of the electrical connection line between the corresponding test interface and the power transformer according to the on-off instruction.

10. The intelligent interface matrix according to claim 1, characterized in that: The intelligent control module, the test interface unit and the sensor monitoring module are detachable.

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