Digital output transformer testing system and method

Abstract

The present application relates to a digital output transformer inspection system and method, including a transformer tester, a signal source, a signal source detection unit, a digital output acquisition unit and a main control unit, wherein the signal source detection unit is used to collect signals from the signal source to obtain a standard signal and a single-phase analog signal, and output them to the transformer tester and the digital output acquisition unit respectively; the digital output acquisition unit is used to convert the single-phase analog signal into a three-phase analog signal, convert the three-phase analog signal into a digital signal, and output it to the transformer tester; the transformer tester is used to verify the digital signal and the standard signal; the main control unit is used to adjust the signal output by the signal source according to the verification result. The system of the present application adopts a single-phase detection system to inspect three-phase products, and reduces the system complexity and cost by simplifying the circuit structure.

Description

Technical Field

[0001] The present application relates to the field of electronic device verification, and in particular to a digital output transformer verification system and method. Background Art

[0002] The digital transformer calibration system is a device used to test and calibrate current transformers (CT) and voltage transformers (VT) used in power systems. In modern industrial production, inspection technology is a key link to ensure product quality and safety. The products to be inspected include single-phase products and three-phase products. Due to structural differences, corresponding calibration systems can only be designed for different products. The calibration system designed for three-phase products has complex circuits, resulting in high costs, which causes waste when used to inspect single-phase products. When the calibration system designed for single-phase products is used for three-phase product inspection, three wirings are required during the calibration process, which makes the wiring process cumbersome and error-prone, thereby increasing production time and potential wiring error rates. Summary of the invention

[0003] The embodiments of the present application provide a digital output transformer inspection system and method to at least solve the problem in the related art that the inspection equipment circuits for three-phase products are complex, resulting in high costs.

[0004] In a first aspect, an embodiment of the present application provides a digital output transformer inspection system, including a transformer calibrator, a signal source, a signal source detection unit, a digital quantity output acquisition unit and a main control unit, wherein:

[0005] The input end of the signal source detection unit is connected to the output end of the signal source, and the output end of the signal source detection unit is respectively connected to the input end of the transformer tester and the digital output acquisition unit, for collecting signals from the signal source to obtain a standard signal and a single-phase analog signal, and outputting them to the transformer tester and the digital output acquisition unit respectively;

[0006] The output end of the digital quantity output acquisition unit is connected to the transformer calibrator, and is used to convert the three-phase analog signal into a digital quantity signal, and output it to the transformer calibrator;

[0007] The output end of the transformer tester is connected to the input end of the main control unit, and is used to test the digital signal and the standard signal, and output the test result to the main control unit;

[0008] The output end of the main control unit is connected to the signal source, and is used to adjust the signal output by the signal source according to the verification result.

[0009] In one embodiment, the digital quantity output acquisition unit includes a signal conversion module and a digitization unit, wherein the input end of the signal conversion module is connected to the signal source detection unit, and the output end is connected to the digitization unit.

[0010] The single-phase analog signal is simultaneously connected to the three-phase branches of the signal conversion module and converted into a three-phase analog signal, wherein the direction of any one phase of the three-phase analog signal is different from the other two phases;

[0011] The digitization unit is used to perform summing processing on the three-phase analog signals, convert the three-phase analog signals and the summing results into digital signals, and send them to the transformer tester.

[0012] In one embodiment, the signal conversion module includes a first signal conversion port, a second signal conversion port, and a third signal conversion port connected in parallel;

[0013] The first signal conversion port, the second signal conversion port and the third signal conversion port convert the single-phase analog signal into an A-phase analog signal, a B-phase analog signal and a C-phase analog signal respectively; wherein the second signal conversion port reverses the single-phase current analog signal, and the direction of the B-phase current analog signal is opposite to those of the A-phase current analog signal and the C-phase current analog signal.

[0014] In one embodiment, the signal source detection unit includes a voltage detection module and a current detection module, and the signal source includes a voltage source and a current source, wherein:

[0015] The voltage detection module is used to monitor the voltage source in real time to obtain a standard voltage signal;

[0016] The current detection module is used to monitor the current source in real time to obtain a standard current signal.

[0017] In one embodiment, the voltage detection module includes a voltage standard transformer and a boost transformer, and the voltage standard transformer and the boost transformer are connected in parallel;

[0018] The boost transformer is used to perform voltage boost processing on the voltage signal output by the voltage source to obtain a boost signal, and send the boost signal as the voltage single-phase analog signal to the digital quantity output acquisition unit;

[0019] The voltage standard transformer is used to perform standardization transformation on the boost signal to obtain the standard voltage signal.

[0020] In one embodiment, the current detection module includes a current standard transformer and a current boosting transformer, and the current standard transformer and the current boosting transformer are connected in series;

[0021] The current transformer is used to perform current boosting processing on the current signal output by the current source to obtain a current boosting signal, and send the current boosting signal as the current single-phase analog signal to the digital quantity output acquisition unit;

[0022] The current standard transformer is used to perform standard transformation on the current boost signal to obtain the standard current signal.

[0023] In one embodiment, the transformer tester and the signal source are communicatively connected to the main control unit via an RS232 serial port.

[0024] In one embodiment, the digital quantity output acquisition unit is connected to the transformer tester for communication via a 485 serial port.

[0025] In a second aspect, an embodiment of the present application provides a digital output transformer testing method, which is applied in the digital output transformer testing system described in any one of the above embodiments, and the method includes:

[0026] Collecting signals from the signal source to obtain a standard signal and a single-phase analog signal;

[0027] Convert the single-phase analog signal into a three-phase analog signal, and convert the three-phase analog signal into a digital signal;

[0028] Verifying the digital signal and the standard signal to obtain a verification result;

[0029] The signal output by the signal source is adjusted according to the verification result.

[0030] In one embodiment, converting the single-phase analog signal into a three-phase analog signal, and converting the three-phase analog signal into a digital signal includes:

[0031] Converting the single-phase analog signal into a three-phase analog signal in a multi-branch manner, wherein the direction of any one phase of the three-phase analog signal is different from the other two phases;

[0032] The three-phase analog signals are summed and the summation result is converted into a digital signal.

[0033] The digital output transformer inspection system and method provided in the embodiments of the present application have at least the following technical effects:

[0034] Through the digital output transformer inspection system and method provided by the present application, a single-phase detection method is used to inspect three-phase products. The system of the present application reduces system complexity and cost by simplifying the circuit structure and using a single-phase system to detect three-phase products.

[0035] Details of one or more embodiments of the present application are set forth in the following drawings and description to make other features, objects, and advantages of the present application more readily apparent. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0037] Figure 1 is a structural block diagram of a digital output transformer testing system in one embodiment of the present application;

[0038] Figure 2 is a structural block diagram of a digital output transformer testing system in another embodiment of the present application;

[0039] Figure 3 It is a structural block diagram of an electronic device in one embodiment of the present application. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application is described and illustrated below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application. Based on the embodiments provided in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0041] Obviously, the drawings described below are only some examples or embodiments of the present application. For ordinary technicians in this field, the present application can also be applied to other similar scenarios based on these drawings without creative work. In addition, it can also be understood that although the efforts made in this development process may be complicated and lengthy, for ordinary technicians in this field related to the content disclosed in this application, some changes in design, manufacturing or production based on the technical content disclosed in this application are just conventional technical means, and should not be understood as insufficient content disclosed in this application.

[0042] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those of ordinary skill in the art that the embodiments described in this application may be combined with other embodiments without conflict.

[0043] Unless otherwise defined, the technical terms or scientific terms involved in this application should be understood by people with ordinary skills in the technical field to which this application belongs. The words "one", "a", "a", "the" and the like involved in this application do not indicate a quantity limitation, and may indicate the singular or plural. The terms "include", "comprise", "have" and any of their variations involved in this application are intended to cover non-exclusive inclusions; for example, a process, method, system, product or device that includes a series of steps or modules (units) is not limited to the listed steps or units, but may also include steps or units that are not listed, or may also include other steps or units inherent to these processes, methods, products or devices. The words "connect", "connected", "coupled" and the like involved in this application are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The "multiple" involved in this application refers to two or more. "And / or" describes the association relationship of associated objects, indicating that there may be three relationships, for example, "A and / or B" can mean: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the objects before and after are in an "or" relationship. The terms "first", "second", "third", etc. involved in this application are only used to distinguish similar objects and do not represent a specific ordering of the objects.

[0044] In one embodiment, a digital output transformer testing system is provided, specifically, Figure 1 As shown, the inspection system of this embodiment includes a transformer tester, a signal source, a signal source detection unit, a digital output acquisition unit and a main control unit. Among them, the input end of the signal source detection unit is connected to the output end of the signal source, and the output end of the signal source detection unit is respectively connected to the input end of the transformer tester and the digital output acquisition unit, which is used to collect signals from the signal source, obtain standard signals and single-phase analog signals, and output them to the transformer tester and the digital output acquisition unit respectively; the output end of the digital output acquisition unit is connected to the transformer tester, which is used to convert the single-phase analog signal into a three-phase analog signal, convert the three-phase analog signal into a digital signal, and output it to the transformer tester; the output end of the transformer tester is connected to the input end of the main control unit, which is used to verify the digital signal and the standard signal, and output the verification result to the main control unit; the output end of the main control unit is connected to the signal source, which is used to adjust the signal output by the signal source according to the verification result.

[0045] In the preferred embodiment of the present application, the detailed connection relationship between the transformer tester, the signal source, the signal source detection unit, the digital quantity output acquisition unit and the main control unit is as follows: Figure 2 .like Figure 2As shown, the digital output acquisition unit includes a signal conversion module and a digitization unit. The input end of the signal conversion module is connected to the signal source detection unit, and the output end is connected to the digitization unit. The signal conversion module is used to convert the single-phase analog signal into a three-phase analog signal (i.e. Figure 2 The measured analog signal in the three-phase analog signal), wherein the direction of any one phase in the three-phase analog signal is different from the other two phases; the digitization unit is used to sum the three-phase analog signals, convert the summation result into a digital signal, and send it to the transformer tester.

[0046] The signal conversion module includes a first signal conversion port, a second signal conversion port and a third signal conversion port connected in parallel. The first signal conversion port, the second signal conversion port and the third signal conversion port convert the single-phase analog signal into an A-phase analog signal, a B-phase analog signal and a C-phase analog signal respectively; wherein the second signal conversion port reverses the single-phase analog signal, and the direction of the B-phase analog signal is opposite to that of the A-phase analog signal and the C-phase analog signal.

[0047] In this embodiment, one of the three-phase signals is connected in reverse. In principle, the positive and negative phases cancel each other out, and the remaining phase output signal is the zero-sequence current signal. In practice, it is impossible to completely cancel each other out due to manufacturing differences. Therefore, this method can also verify the consistency of the two-phase errors. In addition, it also solves the problem of insufficient range of the transformer tester. If the output amplitude of the three-phase added zero-sequence current signal is 6V×3, which is 18V, and the maximum input amplitude of the transformer tester is 7V, which has exceeded the measurement range, the two-phase cancellation method just meets the requirement, avoiding the disadvantage of phase-by-phase wiring test in order not to exceed the range of the transformer tester.

[0048] Preferably, the signal source detection unit includes a voltage detection module and a current detection module, and the signal source includes a voltage source and a current source. The voltage detection module is used to monitor the voltage source in real time to obtain a standard voltage signal; the current detection module is used to monitor the current source in real time to obtain a standard current signal.

[0049] Specific reference Figure 2 The voltage detection module includes a voltage standard transformer and a boost transformer, and the voltage standard transformer and the boost transformer are connected in parallel. The boost transformer is used to boost the voltage signal output by the voltage source to obtain a boost signal (i.e. Figure 2 The primary voltage signal in the boost signal is sent to the digital quantity output acquisition unit as the voltage single-phase analog signal; the voltage standard transformer is used to perform a standardized transformation on the boost signal to obtain the standard voltage signal.

[0050] The current detection module includes a current standard transformer and a current boosting transformer, wherein the current standard transformer and the current boosting transformer are connected in series. The current transformer is used to perform current boosting processing on the current signal output by the current source to obtain a current boosting signal (i.e. Figure 2 The primary current signal in the boost signal is sent to the digital quantity output acquisition unit as the current single-phase analog signal; the current standard transformer is used to perform a standardized transformation on the boost signal to obtain the standard current signal.

[0051] This method reduces system complexity and cost by simplifying the circuit structure and using a single-phase system to detect three-phase products. However, this method has some limitations. For example, when using single-phase detection, since three-phase products are essentially three-phase, single-phase detection may not fully simulate actual operating conditions, resulting in limited accuracy of the detection results, but this limited accuracy is acceptable within the allowable error range.

[0052] In the examples of this application, refer to Figure 2 The transformer tester and the signal source are connected to the main control unit through the RS232 serial port. The digital output acquisition unit is connected to the main control unit through the 485 serial port.

[0053] In a preferred embodiment, reference Figure 2 , the user can select a digitally controlled voltage source and / or current source of appropriate size according to actual needs, and then connect it to the computer (if there are both voltage source and current source, connect the voltage source and current source in parallel), the computer controls the output power size, and then detects the voltage source or current source through the standard transformer, obtains the standard signal and sends it to the digital transformer, detects the voltage source or current source through the boost transformer or the current boost transformer, obtains the primary voltage signal or the primary current signal and sends it to the measured digital quantity output transformer, and the measured digital quantity output transformer converts and processes the primary voltage signal or the primary current signal. In the embodiment of the present application, the voltage standard transformer and the boost transformer are connected in parallel, and the current standard transformer and the current boost transformer are connected in series.

[0054] For the signal conversion module, relays, transistors, phase conversion networks or ordinary cable connectors can be used. Specifically, at the cable connection level, the signal inversion can be achieved by simply reversing one end of the cable (i.e., exchanging the polarity of the two connection points), which is usually done on the connecting plug or terminal. The switching function of the relay can also be used to change the signal path to achieve the signal inversion. The relay can be activated by an electronic control signal to automatically switch the phase. Electronic components can also be used. Electronic components such as diodes, transistors, field effect transistors (MOSFETs) can be used in the circuit to achieve the signal inversion. For example, the signal polarity can be reversed by a transistor amplifier. It is also possible to use a phase conversion network. In some complex electronic devices, a special phase conversion network may be used to change the phase of the signal. This network can be passive (consisting only of resistors, capacitors and inductors) or active (including active components such as amplifiers). The signal inversion can also be achieved by layout and routing during the circuit board design stage. For example, a specific path can be designed on the circuit board so that the current flows in the opposite direction, thereby achieving the signal inversion. In some digital systems, the logical inversion of a signal can also be achieved through software control, especially when processing digital signals.

[0055] The three signal conversion ports are connected in parallel, so the output three-phase signals are of the same magnitude but different in direction, so that two of the phases can cancel each other out after summing. After the single-phase analog signal is converted into a three-phase analog signal, it is summed and digitized by the digitization unit. Figure 2 The digitization unit in the instrument adopts an analog-to-digital converter (ADC) with summing calculation capability, so that the analog signal can be converted into a digital signal and sent to the digital transformer tester.

[0056] A transformer calibrator is a device used to test and calibrate current transformers (CT) and voltage transformers (VT). They are used in power systems to measure current and voltage to ensure the safe and accurate operation of the power system. Currently, there are many types of transformer calibrators, so users can choose according to different test requirements and technical characteristics.

[0057] The transformer calibrator calibrates the received digital signal and standard signal, and outputs the calibration result to the computer, which then feeds the calibration result back to the user so that the user can understand the actual accuracy of the transformer. On the other hand, the computer can also adjust the signal output by the signal source according to the calibration result, thereby realizing the calibration of the transformer and ensuring the accurate output power size.

[0058] In summary, this kind of calibration system is mainly used for mass production. There are several key points for mass production. First, the system should be simple. There is a simplest way. Although the product is three-phase, we use a single-phase system to detect a three-phase product. In this way, the service system is simple and the whole cost is much cheaper.

[0059] Secondly, when performing single-phase detection, wiring issues are involved. This embodiment utilizes the signal conversion module to convert three-phase analog signals through multiple branches to achieve one-time wiring to complete voltage and current detection, including zero-sequence voltage and zero-sequence current detection. No phase change wiring is required during the process, thereby achieving full automation and full CNC one-button completion of the entire detection process.

[0060] Under normal circumstances, the three phases are connected in the positive direction. By connecting any one phase in the reverse direction, the problem of insufficient range of the transformer tester is solved, and the consistency of the two-phase error is also verified. Although this detection method is different from the actual operating state, it is feasible in the laboratory and mass production, and it also solves the actual problem.

[0061] In a second aspect, the present application provides a digital output transformer testing method, characterized in that, applied in the digital output transformer testing system described in any of the above embodiments, the method provided by the embodiment of the present application comprises the following steps:

[0062] Step S1, collecting signals from the signal source to obtain a standard signal and a single-phase analog signal;

[0063] Step S2, converting the single-phase analog signal into a three-phase analog signal, and converting the three-phase analog signal into a digital signal;

[0064] Step S3, verifying the digital signal and the standard signal to obtain a verification result;

[0065] Step S4: adjusting the signal output by the signal source according to the verification result.

[0066] Among them, converting the single-phase analog signal into a three-phase analog signal and converting the three-phase analog signal into a digital signal includes: converting the single-phase analog signal into a three-phase analog signal in a multi-branch manner, wherein the direction of any one phase of the three-phase analog signal is different from the other two phases; summing the three-phase analog signals and converting the summation result into a digital signal.

[0067] In a third aspect, an embodiment of the present application provides an electronic device, Figure 3 FIG. 1 is a block diagram of an electronic device according to an exemplary embodiment. Figure 3 As shown, the electronic device may include a processor 11 and a memory 12 storing computer program instructions.

[0068] Specifically, the processor 11 may include a central processing unit (CPU), or an application specific integrated circuit (ASIC), or may be configured to implement one or more integrated circuits of the embodiments of the present application.

[0069] Among them, the memory 12 may include a large-capacity memory for data or instructions. By way of example and not limitation, the memory 12 may include a hard disk drive (HDD), a floppy disk drive, a solid-state drive (SSD), a flash memory, an optical disk, a magneto-optical disk, a magnetic tape, or a universal serial bus (USB) drive, or a combination of two or more of these. Where appropriate, the memory 12 may include a removable or non-removable (or fixed) medium. Where appropriate, the memory 12 may be inside or outside the data processing device. In a specific embodiment, the memory 12 is a non-volatile memory. In a specific embodiment, the memory 12 includes a read-only memory (ROM) and a random access memory (RAM). Where appropriate, the ROM may be a mask-programmed ROM, a programmable ROM (PROM), an erasable PROM (EPROM), an electrically erasable PROM (EEPROM), an electrically alterable ROM (EAROM) or a flash memory (FLASH), or a combination of two or more of these. Under appropriate circumstances, the RAM can be a static random access memory (SRAM) or a dynamic random access memory (DRAM), wherein the DRAM can be a fast page mode dynamic random access memory (FPMDRAM), an extended data output dynamic random access memory (EDODRAM), a synchronous dynamic random access memory (SDRAM), etc.

[0070] The memory 12 may be used to store or cache various data files that need to be processed and / or used for communication, as well as possible computer program instructions executed by the processor 11 .

[0071] The processor 11 implements any one of the digital output transformer testing methods in the above embodiments by reading and executing computer program instructions stored in the memory 12 .

[0072] In one embodiment, the electronic device may further include a communication interface 13 and a bus 10. Figure 3 As shown, the processor 11, the memory 12, and the communication interface 13 are connected via a bus 10 and communicate with each other.

[0073] The communication interface 13 is used to realize the communication between the modules, devices, units and / or equipment in the embodiment of the present application. The communication port 13 can also realize data communication with other components such as: external devices, image / data acquisition equipment, databases, external storage and image / data processing workstations.

[0074] The bus 10 includes hardware, software or both, and couples the components of the electronic device to each other. The bus 10 includes but is not limited to at least one of the following: a data bus, an address bus, a control bus, an expansion bus, and a local bus. By way of example and not limitation, bus 10 may include an Accelerated Graphics Port (AGP) or other graphics bus, an Extended Industry Standard Architecture (EISA) bus, a Front Side Bus (FSB), a Hyper Transport (HT) interconnect, an Industry Standard Architecture (ISA) bus, an InfiniBand interconnect, a Low Pin Count (LPC) bus, a memory bus, a Micro Channel Architecture (MCA) bus, a Peripheral Component Interconnect (PCI) bus, a PCI-Express (PCI-X) bus, a Serial Advanced Technology Attachment (SATA) bus, a Video Electronics Standards Association Local Bus (VLB) bus, or other suitable buses or a combination of two or more of these. Where appropriate, bus 10 may include one or more buses. Although embodiments of the present application describe and illustrate a particular bus, the present application contemplates any suitable bus or interconnect.

[0075] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium having a program stored thereon, and when the program is executed by a processor, the digital output transformer inspection method provided in the first aspect is implemented.

[0076] The readable storage medium may include but is not limited to: a portable disk, a hard disk, a random access memory, a read-only memory, an erasable programmable read-only memory, an optical storage device, a magnetic storage device or any suitable combination of the above.

[0077] In a possible implementation, the present invention can also be implemented in the form of a program product, which includes a program code. When the program product is run on a terminal device, the program code is used to enable the terminal device to execute the steps of the digital output transformer inspection method provided in the first aspect.

[0078] The program code for executing the present invention may be written in any combination of one or more programming languages, and may be executed entirely on a user device, partially on a user device, as an independent software package, partially on a user device and partially on a remote device, or entirely on a remote device.

[0079] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0080] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A digital output transformer testing system, characterized in that: It includes a transformer calibrator, a signal source, a signal source detection unit, a digital output acquisition unit and a main control unit, wherein: The input end of the signal source detection unit is connected to the output end of the signal source, and the output end of the signal source detection unit is respectively connected to the input end of the transformer tester and the digital output acquisition unit, for collecting signals from the signal source to obtain a standard signal and a single-phase analog signal, and outputting them to the transformer tester and the digital output acquisition unit respectively; The output end of the digital quantity output acquisition unit is connected to the transformer tester, and is used to convert the single-phase analog signal into a three-phase analog signal, convert the three-phase analog signal into a digital quantity signal, and output it to the transformer tester; The output end of the transformer tester is connected to the input end of the main control unit, and is used to test the digital signal and the standard signal, and output the test result to the main control unit; The output end of the main control unit is connected to the signal source, and is used to adjust the signal output by the signal source according to the verification result; The digital quantity output acquisition unit includes a signal conversion module and a digitization unit. The input end of the signal conversion module is connected to the signal source detection unit, and the output end is connected to the digitization unit. The signal conversion module is used to convert the single-phase analog signal into a three-phase analog signal in a multi-branch manner, wherein the direction of any one phase of the three-phase analog signal is different from the other two phases; The digitization unit is used to sum the three-phase analog signals, convert the summation result into a digital signal, and send it to the transformer tester; The signal conversion module includes a first signal conversion port, a second signal conversion port and a third signal conversion port connected in parallel; The first signal conversion port and the third signal conversion port convert the single-phase analog signal into an A-phase analog signal and a C-phase analog signal, respectively; wherein the second signal conversion port converts the single-phase analog signal into a B-phase analog signal, wherein the direction of the B-phase analog signal is opposite to those of the A-phase analog signal and the C-phase analog signal.

2. The system according to claim 1, characterized in that The signal source detection unit includes a voltage detection module and a current detection module, and the signal source includes a voltage source and a current source, wherein: The voltage detection module is used to monitor the voltage source in real time to obtain a standard voltage signal; The current detection module is used to monitor the current source in real time to obtain a standard current signal.

3. The system according to claim 2, characterized in that The voltage detection module includes a voltage standard transformer and a boost transformer, and the voltage standard transformer and the boost transformer are connected in parallel; The boost transformer is used to perform voltage boost processing on the voltage signal output by the voltage source to obtain a boost signal, and send the boost signal as the single-phase analog signal to the digital quantity output acquisition unit; The voltage standard transformer is used to perform standardization transformation on the boost signal to obtain the standard voltage signal.

4. The system according to claim 2, characterized in that The current detection module comprises a current standard transformer and a current boosting transformer, wherein the current standard transformer and the current boosting transformer are connected in series; The current boosting transformer is used to perform current boosting processing on the current signal output by the current source to obtain a current boosting signal, and send the current boosting signal as the single-phase analog signal to the digital quantity output acquisition unit; The current standard transformer is used to perform standard transformation on the current boost signal to obtain the standard current signal.

5. The system according to claim 1, characterized in that The transformer tester and the signal source are connected to the main control unit for communication via the RS232 serial port.

6. The system according to claim 1, characterized in that The digital quantity output acquisition unit is connected to the transformer tester for communication via a 485 serial port.

7. A digital output transformer testing method, characterized in that: Applied in the digital output transformer inspection system according to any one of claims 1 to 6, the method comprises: Performing signal acquisition on the signal source to obtain a standard signal and a single-phase analog signal; Convert the single-phase analog signal into a three-phase analog signal, and convert the three-phase analog signal into a digital signal; Verifying the digital signal and the standard signal to obtain a verification result; The signal output by the signal source is adjusted according to the verification result.

8. The method according to claim 7, characterized in that The step of converting the single-phase analog signal into a three-phase analog signal and converting the three-phase analog signal into a digital signal comprises: Converting the single-phase analog signal into a three-phase analog signal in a multi-branch manner, wherein the direction of any one phase of the three-phase analog signal is different from the other two phases; The three-phase analog signals are summed and the summation result is converted into a digital signal.

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