Experimental system and experimental method for oil-paper insulation electromechanical joint effect of transformer

Abstract

The invention relates to the technical field of transformers, in particular to a transformer oil paper insulation electromechanical joint effect experiment system and method, and the system comprises a power frequency test device, a vibration table and a signal collection device. The power frequency test device comprises a transformer and a voltage divider, and power frequency voltage generated by the transformer is applied to the experimental sample through the voltage divider; the vibration table comprises a mechanical firmware, and the mechanical firmware is fixedly connected with the experimental sample and applies a vibration signal with preset frequency and amplitude to the experimental sample; and the signal collection device is used for collecting the experimental mechanical vibration signal and the experimental discharge physical quantity signal. According to the invention, the insulation damage evolution process of the transformer under the oil-paper insulation electromechanical combined action can be researched, the problem that the influence rule of vibration on oil-paper insulation partial discharge is not clear is solved, and the technical blank of the transformer insulation live detection technology under the mechanical-electrical combined action is filled up.

Description

Technical Field

[0001] The present application relates to the technical field of transformers, and in particular to an experimental system and method for an oil-paper insulation electromechanical combined action experiment of a transformer. Background Art

[0002] Power transformers are the "core" of the power grid. Once a fault occurs, it will cause huge economic losses, and in serious cases, it may cause the local power grid to be paralyzed. As a complex system combining mechanical and electrical, the transformer will produce mechanical vibrations under normal working conditions. This vibration has potential destructive power to oil-paper insulation materials. Oil-paper insulation materials are widely used in oil-immersed equipment such as power transformers. When the equipment is running, it is subjected to thermal, electrical and mechanical stresses and continues to age.

[0003] During the actual operation of the equipment, the vibration of the transformer will cause insulation damage and stimulate partial discharge in the oil-paper insulation. Mechanical vibration has a significant impact on the initiation and development of partial discharge in the insulation. At present, when studying the partial discharge characteristics of transformer insulation, there is a lack of experimental platforms that consider the influence of mechanical stress. Specifically, although there have been many studies on the influence of single electrical stress on the partial discharge (PD) characteristics of transformer oil-paper insulation, in actual operation, the vibration of the transformer will cause the insulation material to break and induce partial discharge, thereby affecting the changes in insulation characteristics.

[0004] Therefore, there is an urgent need for an experimental system and method for the combined electromechanical effects of transformer oil-paper insulation to study the characteristics of transformer oil-paper insulation under the combined effects of mechanical vibration and electrical stress. Summary of the invention

[0005] In view of this, it is necessary to provide a transformer oil-paper insulation combined electromechanical experimental system to make up for the lack of an experimental platform for applying vibration signals and electrical signals to the oil-paper insulation model in the prior art, and to realize the study of the insulation partial discharge characteristics of the transformer oil-paper insulation.

[0006] A transformer oil-paper insulation electromechanical combined action experimental system, including a power frequency test device, a vibration table and a signal collection device; The power frequency test device comprises a transformer and a voltage divider, and the power frequency voltage generated by the transformer is applied to the test sample through the voltage divider; The vibration table includes a mechanical fixture, which is fixedly connected to the experimental sample and applies a vibration signal of a preset frequency and amplitude to the experimental sample; The signal collection device is used to collect experimental mechanical vibration signals and experimental discharge physical quantity signals.

[0007] Preferably, the mechanical fixture of the vibration table is fixedly connected to the experimental sample portion to achieve relative vibration inside the experimental sample.

[0008] Preferably, it also includes a computing device for analyzing the combined electromechanical effect of transformer oil-paper insulation based on the experimental mechanical vibration signal and the experimental discharge physical quantity signal.

[0009] Preferably, a protective resistor is further provided between the transformer and the voltage divider, and the power frequency voltage generated by the transformer is applied to the experimental sample via the protective resistor and through the voltage divider.

[0010] Preferably, it also includes: a control computer for controlling the power frequency test device and the vibration table.

[0011] Compared with the prior art, the beneficial effect of the present application is that the above-mentioned transformer oil-paper insulation electromechanical combined action experimental system can study the evolution process of transformer oil-paper insulation damage by simultaneously outputting electrical signals and vibration signals to the tested insulating paper experimental samples and collecting experimental mechanical vibration signals and experimental discharge physical quantity signals, thereby solving the problem of unclear laws of the influence of vibration on partial discharge of oil-paper insulation and filling the technical gap in transformer insulation live detection technology under mechanical-electrical combined action. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the transformer oil-paper insulation electromechanical combined action experimental system provided in this application.

[0013] Figure 2 It is a structural schematic diagram of the vibration table 20 provided in this application.

[0014] Figure 3 It is a flow chart of the experimental method based on the transformer oil-paper insulation electromechanical combined action experimental system provided in this application.

[0015] Figure 4 It is a schematic diagram of the analysis process provided by this application.

[0016] Figure 5 It is a structural schematic diagram of a computing device 900 provided in this application. DETAILED DESCRIPTION

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] See also Figure 1-2 , Figure 1It is a structural schematic diagram of the transformer oil-paper insulation electromechanical combined action experimental system provided by the present application; Figure 2 It is a structural schematic diagram of the vibration table 20 provided in this application.

[0019] The transformer oil-paper insulation electromechanical combined action experimental system includes: a power frequency test device 10, a vibration table 20 and a signal collection device 30; The power frequency test device 10 includes a transformer 11 and a voltage divider 12 . The power frequency voltage generated by the transformer 11 is applied to the test sample through the voltage divider 12 .

[0020] The vibration table 20 includes a mechanical fixture 21, which is fixedly connected to the experimental sample and applies a vibration signal of a preset frequency and amplitude to the experimental sample. The purpose of the mechanical fixture 21 is to fix and press the experimental sample so that the applied vibration signal can be transmitted to the experimental sample with the desired effect. The structure of the mechanical fixture 21 can be fastened by a thread 22, or can be a component such as various metal fixing blocks that can transmit vibration well.

[0021] In addition, the voltage divider 12 can also apply a signal through the high-voltage electrode 23, and the high-voltage electrode 23 can be fixed to the experimental sample through an insulating material so that the high-voltage electrode is isolated from the ground electrode, simulating the relative movement of the winding insulation in the actual vibration of the transformer. Furthermore, the mechanical fixture 21 can be partially fixed to the experimental sample instead of being fixed as a whole. By partially connecting the mechanical fixture to the experimental sample, the relative vibration between the internal components of the actual transformer can be simulated. This setting is closer to the actual working conditions, improves the equivalence with the vibration conditions of the transformer in the actual electromechanical environment, and can more realistically reflect the impact of mechanical vibration on the insulating material.

[0022] The signal collection device 30 is used to collect the experimental mechanical vibration signal and the experimental discharge physical quantity signal, wherein the experimental discharge physical quantity signal may include a pulse current signal, an ultrasonic signal, an ultra-high frequency signal, and the like.

[0023] The transformer oil-paper insulation electromechanical combined action experimental system provided in this embodiment can simulate the combined effects of mechanical vibration and power frequency electric field during actual transformer operation, which is helpful to study the aging process and partial discharge characteristics of oil-paper insulation under the combined action of mechanical vibration and electrical stress, thereby improving the accuracy of transformer health status assessment.

[0024] Furthermore, the transformer oil-paper insulation electromechanical combined action experimental system provided in the embodiment of the present application may also include a computing device for analyzing the transformer oil-paper insulation electromechanical combined action based on the experimental mechanical vibration signal and the experimental discharge physical quantity signal. The computing device may be a PC, a portable computer, or other equipment.

[0025] Furthermore, a protective resistor 13 is provided between the transformer and the voltage divider, and the power frequency voltage generated by the transformer is applied to the experimental sample through the voltage divider via the protective resistor. Providing a protective resistor can protect the experimental equipment from overvoltage damage, ensure the safety of the experiment, and also ensure the validity of the experimental results.

[0026] Furthermore, the transformer oil-paper insulation electromechanical combined action experimental system provided in the embodiment of the present application may also include a control computer for controlling the power frequency test device and the vibration table. The control computer may be an industrial computer, etc., or may be integrated with the above-mentioned computing device. By setting up the control computer, not only the experimental conditions can be automatically controlled, but also the experimental data can be processed. The improvement of the degree of automation helps to reduce human errors and improve the efficiency of the experiment.

[0027] Based on an inventive concept, this application also provides an experimental method based on a transformer oil-paper insulation electromechanical combined action experimental system, please refer to Figure 3 to Figure 4 , Figure 3 This is a flow chart of the experimental method based on the transformer oil-paper insulation electromechanical combined action experimental system provided by the present application. Figure 4 The experimental method based on the transformer oil-paper insulation electromechanical combined action experimental system includes the following steps: S201: Apply the power frequency voltage output by the transformer to the experimental sample through a voltage divider.

[0028] First, the transformer can adjust the voltage amplitude to obtain the required voltage amplitude, set the protection resistor 13, and set the voltage divider 12 between the two protection resistors, apply the power frequency voltage of a specific amplitude to the experimental sample 100, and complete the application of the power frequency signal in the electromechanical combined signal.

[0029] S202: applying a preset vibration signal to the experimental sample through a vibration table.

[0030] At the same time, the vibration table 20 is directly connected to the experimental sample 100 through the mechanical component 21, and a vibration signal of a specific frequency and amplitude is directly applied to a specific position of the experimental sample 100, thereby completing the application of the mechanical vibration signal in the electromechanical combined signal.

[0031] S203: Collecting experimental mechanical vibration signals and experimental discharge physical quantity signals of the experimental samples.

[0032] The signal collection device 30 is connected to the experimental sample 100 to detect and collect data during the experiment for subsequent analysis. The signal collection device 30 can be one or more partial discharge sensors, and the signals it can collect include pulse current signals, ultra-high frequency signals and ultrasonic signals. In addition, vibration signals can also be collected through vibration sensors.

[0033] S204: Analyze the combined electromechanical effect of transformer oil-paper insulation based on the experimental mechanical vibration signal and the experimental discharge physical quantity signal.

[0034] Finally, based on the collected data, the evolution process of transformer oil-paper insulation damage under the combined mechanical and electrical effects can be analyzed. For example, the average partial discharge value, repetition rate, apparent discharge amount, discharge frequency, PD phase and other information can be obtained, and correlation analysis can be performed with the collected vibration signals to further study the partial discharge characteristics under the influence of vibration signals.

[0035] The method provided in this embodiment improves the safe operation level of the transformer and solves the problem of unclear influence of vibration on partial discharge of oil-paper insulation.

[0036] Figure 5 900 is a schematic structural diagram of a computing device provided by the present application. The computing device can execute the optional embodiments of the experimental method based on the above transformer oil-paper insulation electromechanical combined action experimental system. The computing device can be a terminal or a chip or chip system inside the terminal. Figure 5 As shown, the computing device 900 includes: a processor 910 , a memory 920 , and a communication interface 930 .

[0037] It should be understood that Figure 5 The communication interface 930 in the computing device 900 shown may be used to communicate with other devices, and may specifically include one or more transceiver circuits or interface circuits.

[0038] The processor 910 may be connected to a memory 920. The memory 920 may be used to store the program code and data. Therefore, the memory 920 may be a storage unit inside the processor 910, or an external storage unit independent of the processor 910, or a component including a storage unit inside the processor 910 and an external storage unit independent of the processor 910.

[0039] Optionally, the computing device 900 may further include a bus. The memory 920 and the communication interface 930 may be connected to the processor 910 via the bus. The bus may be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 5 A line without an arrow is used to represent the bus, but this does not mean that there is only one bus or one type of bus.

[0040] It should be understood that in the embodiment of the present application, the processor 910 may adopt a central processing unit (CPU). The processor may also be other general-purpose processors, digital signal processors (DSP), application specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc. Alternatively, the processor 910 may adopt one or more integrated circuits to execute relevant programs to implement the technical solutions provided in the embodiment of the present application.

[0041] The memory 920 may include a read-only memory and a random access memory, and provides instructions and data to the processor 910. A portion of the processor 910 may also include a nonvolatile random access memory. For example, the processor 910 may also store information on the device type.

[0042] When the computing device 900 is running, the processor 910 executes the computer-executable instructions in the memory 920 to perform any operation step of the above method and any optional embodiment thereof.

[0043] It should be understood that the computing device 900 according to the embodiment of the present application may correspond to the corresponding subject in the method according to each embodiment of the present application, and the above-mentioned and other operations and / or functions of each module in the computing device 900 are respectively to implement the steps of the present method, and can be implemented by electronic hardware, or computer software, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present application. For example, the devices described in the above embodiments, or the units or modules contained in the devices, can be implemented by processes or software modules, wherein the software modules can be units obtained by splitting according to functional logic. Technical personnel in the relevant field can clearly understand that the corresponding processes of the various methods of the examples are not repeated here for the sake of brevity.

[0044] A person of ordinary skill in the art may appreciate that, in combination with the units and components of the various examples described in the embodiments disclosed herein, for the sake of convenience and brevity of description, the specific working processes of the systems, devices, and units described above may refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0045] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0046] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0047] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0048] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0049] An embodiment of the present application also provides a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, it is used to execute the above method, which includes at least one of the solutions described in the above embodiments.

[0050] The computer storage medium of the embodiment of the present application can adopt any combination of one or more computer-readable media. Computer-readable media can be computer-readable signal media or computer-readable storage media. Computer-readable storage media can be, for example, but not limited to, electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices or devices, or any combination of the above. More specific examples (non-exhaustive lists) of computer-readable storage media include: electrical connections with one or more wires, portable computer disks, hard disks, random access memories (RAM), read-only memories (ROM), erasable programmable read-only memories (EPROM or flash memory), optical fibers, portable compact disk read-only memories (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the above. In this document, computer-readable storage media can be any tangible medium containing or storing programs, which can be used by instruction execution systems, devices or devices or used in combination with them.

[0051] Computer-readable signal media may include data signals propagated in baseband or as part of a carrier wave, which carry computer-readable program code. Such propagated data signals may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. Computer-readable signal media may also be any computer-readable medium other than a computer-readable storage medium, which may send, propagate, or transmit a program for use by or in conjunction with an instruction execution system, apparatus, or device.

[0052] The program code embodied on the computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.

[0053] Computer program code for performing the operation of the present application can be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages, such as Java, Smalltalk, C++, and conventional procedural programming languages, such as "C" language or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as an independent software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer can be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or can be connected to an external computer (e.g., using an Internet service provider to connect through the Internet).

[0054] In addition, the words "first, second, third, etc." or module A, module B, module C and other similar terms in the specification and claims are only used to distinguish similar objects and do not represent a specific ordering of the objects. It can be understood that the specific order or sequence can be interchanged where permitted so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0055] In the above description, the numbers representing the steps, such as S110, S120, etc., do not necessarily mean that the steps will be executed accordingly. If permitted, the order of the steps can be interchanged or they can be executed simultaneously.

[0056] The term "comprising" as used in the description and claims should not be interpreted as being limited to what is listed thereafter; it does not exclude other elements or steps. Therefore, it should be interpreted as specifying the presence of the features, integers, steps or components mentioned, but does not exclude the presence or addition of one or more other features, integers, steps or components and groups thereof. Therefore, the expression "a device comprising means A and B" should not be limited to a device consisting of components A and B only.

[0057] References to "one embodiment" or "an embodiment" in this specification mean that a particular feature, structure, or characteristic described in conjunction with the embodiment is included in at least one embodiment of the present application. Therefore, the phrases "in one embodiment" or "in an embodiment" appearing in various places in this specification do not necessarily refer to the same embodiment, but may refer to the same embodiment. In addition, in one or more embodiments, the particular features, structures, or characteristics can be combined in any appropriate manner, as would be apparent to one of ordinary skill in the art from this disclosure.

[0058] Note that the above are only preferred embodiments of the present application and the technical principles used. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present application. Therefore, although the present application is described in more detail through the above embodiments, the present application is not limited to the above embodiments, and may also include more other equivalent embodiments without departing from the concept of the present application, all of which belong to the scope of protection of the present application.

Claims

1. A transformer oil-paper insulation electromechanical combined action experimental system, characterized in that: It includes power frequency test equipment, vibration table and signal collection equipment; The power frequency test device comprises a transformer and a voltage divider, and the power frequency voltage generated by the transformer is applied to the test sample through the voltage divider; The vibration table includes a mechanical fixture, which is fixedly connected to the experimental sample and applies a vibration signal of a preset frequency and amplitude to the experimental sample; The signal collection device is used to collect experimental mechanical vibration signals and experimental discharge physical quantity signals.

2. The system according to claim 1, characterized in that The mechanical fixture of the vibration table is fixedly connected to the experimental sample part, so as to realize relative vibration inside the experimental sample.

3. The system according to claim 1, characterized in that It also includes a computing device for analyzing the combined electromechanical effect of transformer oil-paper insulation based on the experimental mechanical vibration signal and the experimental discharge physical quantity signal.

4. The system according to claim 1, characterized in that include: A protective resistor is further provided between the transformer and the voltage divider, and the power frequency voltage generated by the transformer is applied to the experimental sample via the protective resistor and the voltage divider.

5. The system according to any one of claims 1 to 4, characterized in that: Also includes: A control computer is used to control the power frequency test device and the vibration table.

6. An experimental method based on the transformer oil-paper insulation electromechanical combined action experimental system, characterized in that: include: Applying the power frequency voltage output by the transformer to the experimental sample through a voltage divider; Applying a preset vibration signal to the experimental sample through a vibration table; Collecting experimental mechanical vibration signals and experimental discharge physical quantity signals of the experimental samples; The combined electromechanical effect of transformer oil-paper insulation is analyzed based on the experimental mechanical vibration signal and the experimental discharge physical quantity signal.

7. The method according to claim 6, characterized in that include: A preset vibration signal is applied to the experimental sample portion.

8. A computing device, characterized in that include: processor, and A memory having program instructions stored thereon, wherein when the program instructions are executed by the processor, the processor executes the experimental method based on the transformer oil-paper insulation electromechanical combined action experimental system as described in any one of claims 6 to 7.

9. A computer-readable storage medium, characterized in that: Program instructions are stored thereon, and when the program instructions are executed by a computer, the computer is enabled to execute the experimental method based on the transformer oil-paper insulation electromechanical combined action experimental system as described in any one of claims 6 to 7.

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