Method and system for evaluating defect development of oil-paper insulation of high-voltage transformer combining acoustic and electrical signals

Abstract

The present application belongs to the field of high voltage and insulation technology, in order to solve the problem that the prior art cannot accurately evaluate the discharge development process of oil paper defects in advance, a high voltage transformer oil paper insulation defect development evaluation method and system are provided. The fusion acoustic electric high voltage transformer oil paper insulation defect development evaluation method comprises obtaining the ultrahigh frequency signal characteristics corresponding to the first type partial discharge and the second type partial discharge and the ultrasonic signal characteristics appearing synchronously, and identifying the partial discharge type; calculating the first type partial discharge pulse t second percentage, the first type partial discharge pulse t second frequency change rate and the second type partial discharge pulse t second frequency change rate and pulse change rate, and then evaluating the development stage of the internal oil paper defect of the extra high voltage transformer. It can use the change rule of the ultrahigh frequency and ultrasonic signals excited by the internal defects of the high voltage transformer to accurately evaluate the defect development state and early warn the insulation fault.

Description

Technical Field

[0001] This invention belongs to the field of high voltage and insulation technology, and in particular relates to a method and system for assessing the development of defects in the oil-paper insulation of high voltage transformers that integrates acoustic and electrical components. Background Technology

[0002] The statements in this section are merely background information related to the present invention and do not necessarily constitute prior art.

[0003] Ultra-high voltage (UHV) and extra-high voltage (UHV) transformers are critical nodes in power transmission, serving as the "heart" of the power system. Due to their large transmission capacity and wide power supply coverage, UHV / UHV transformer faults result in widespread power outages, significant economic losses, and severe social impacts. While existing technologies, such as ultrasonic waves, can identify Type I and Type II partial discharge faults, oil-paper insulation is the transformer's primary electrical insulation system. Faults caused by oil-paper defects are the most serious type of fault in oil-immersed transformers. These defects develop rapidly, making it impossible to accurately assess the discharge development process in advance, leading to significant damage to the transformer insulation and seriously jeopardizing power grid safety. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a method and system for assessing the development of defects in the oil-paper insulation of high-voltage transformers by integrating acoustic and electrical signals. This method can accurately assess the development status of defects and provide early warnings of insulation faults by utilizing the variation patterns of ultra-high frequency and ultrasonic signals excited by internal defects in high-voltage transformers.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] The first aspect of the present invention provides a method for assessing the development of defects in the oil-paper insulation of high-voltage transformers by integrating acoustic and electrical components.

[0007] In one or more embodiments, a method for assessing the development of defects in the oil-paper insulation of high-voltage transformers that integrates acoustic and electrical components is provided, including:

[0008] The characteristics of ultra-high frequency signals and synchronous ultrasonic signals during the development of oil-paper insulation defects in ultra-high voltage transformers were extracted to identify the types of partial discharge, including Type I partial discharge and Type II partial discharge.

[0009] Based on the statistically obtained Type I partial discharge pulse, the... t Total number of times within seconds N I ( t ) and Class II partial discharge pulse t Total number of times within seconds N II ( t), to obtain the percentage of the Type I partial discharge pulse at second t. P I ( t ), the first type of partial discharge pulse t Rate of change of the number of seconds R I ( t ) and Class II partial discharge pulse t Rate of change of the number of seconds R II ( t ), and then according to R I ( t )and R II ( t The pulse change rate is obtained by weighted summation. R ( t );

[0010] comprehensive N I ( t )and N II ( t The result of comparing the accumulated sum with the set first threshold N II ( t Is it 0? P I ( t The comparison results with the set second threshold and R ( t The results are compared with the set third threshold to assess the development stage of internal oil paper defects in ultra-high voltage transformers.

[0011] As one implementation method, when N I ( t )+ N II ( t < first threshold or N II ( t When )=0, the internal oil paper defects of the high-voltage transformer are in the initial development stage.

[0012] As one implementation method, when N I ( t )+ N II ( t )≥first threshold, N II ( t ) > 0, and PI ( t )≤ second threshold or R ( t When the value is less than or equal to the third threshold, the internal oil paper defect of the high-voltage transformer is in a stable development stage.

[0013] As one implementation method, when N I ( t )+ N II ( t )≥first threshold, N II ( t ) > 0, and P I ( t > second threshold or R ( t When the value exceeds the third threshold, the internal oil-paper defects of the high-voltage transformer are in a rapid development stage.

[0014] As one implementation method, when N I ( t )+ N II ( t )≥first threshold, N II ( t ) > 0, and P I ( t ) > second threshold and R ( t When the value exceeds the third threshold, the internal oil paper defect of the high-voltage transformer is in a state of imminent breakdown.

[0015] As one implementation method, the ultra-high frequency signal characteristics corresponding to the type I partial discharge excited during the development of oil-paper insulation defects in ultra-high voltage transformers and the ultrasonic signal characteristics that occur simultaneously with it are as follows:

[0016] The duration of the original ultra-high frequency signal is less than 350 ns, and the peak value is less than 200 mV;

[0017] The original UHF signal frequency distribution is between 250MHz and 350MHz, with frequency points distributed at 260MHz and 320MHz;

[0018] The duration of the ultrasonic signal is less than 6ms and the peak value is less than 150mV.

[0019] As one implementation method, the ultra-high frequency signal characteristics corresponding to the type II partial discharge induced during the development of oil-paper insulation defects in ultra-high voltage transformers and the ultrasonic signal characteristics that occur simultaneously with it are as follows:

[0020] The duration of the original UHF signal is greater than 500 ns, the peak value exceeds 200 mV, and the peak value is less than 300 mV;

[0021] The original UHF signal frequency distribution is between 100MHz and 300MHz, with frequency points distributed at 120MHz, 190MHz and 260MHz.

[0022] The ultrasonic signal duration exceeds 8ms and the peak value is greater than 9V.

[0023] A second aspect of the present invention provides an assessment system for the development of defects in the oil-paper insulation of high-voltage transformers that integrates acoustic and electrical components.

[0024] In one or more embodiments, a high-voltage transformer oil-paper insulation defect development assessment system integrating acoustic and electrical components includes:

[0025] The partial discharge identification module is used to extract the ultra-high frequency signal characteristics and the ultrasonic signal characteristics that occur simultaneously with the oil-paper insulation defects in ultra-high voltage transformers, and to identify the partial discharge category, which includes Class I partial discharge and Class II partial discharge.

[0026] The partial discharge pulse parameter calculation module uses the statistically obtained first-order partial discharge pulse parameter to calculate the first-order partial discharge pulse parameter. t Total number of times within seconds N I ( t ) and Class II partial discharge pulse t Total number of times within seconds N II ( t ), to obtain the percentage of the Type I partial discharge pulse at second t. P I ( t ), the first type of partial discharge pulse t Rate of change of the number of seconds R I ( t ) and Class II partial discharge pulse t Rate of change of the number of seconds R II ( t ), and then according to R I ( t )and R II ( t The pulse change rate is obtained by weighted summation.R ( t );

[0027] The oil paper defect development stage assessment module uses a comprehensive approach. N I ( t )and N II ( t The result of comparing the accumulated sum with the set first threshold N II ( t Is it 0? P I ( t The comparison results with the set second threshold and R ( t The results are compared with the set third threshold to assess the development stage of internal oil paper defects in ultra-high voltage transformers.

[0028] A third aspect of the present invention provides a computer-readable storage medium.

[0029] A computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps in the above-described method for assessing the development of defects in the oil-paper insulation of high-voltage transformers by integrating acoustic and electrical signals.

[0030] A fourth aspect of the present invention provides an electronic device.

[0031] An electronic device includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the steps in the above-described method for assessing the development of defects in the oil-paper insulation of high-voltage transformers that integrates acoustic and electrical signals.

[0032] Compared with the prior art, the beneficial effects of the present invention are:

[0033] This invention, based on ultrasonic and ultra-high frequency partial discharge monitoring signals, can accurately identify the type of partial discharge and calculate the percentage of the first type of partial discharge pulse in second t. P I ( t ), the first type of partial discharge pulse t Rate of change of the number of seconds R I ( t ) and Class II partial discharge pulse t Rate of change of the number of seconds R II ( t ) and pulse change rate R ( tBy comparing the results with the corresponding threshold, the development stage of the oil-paper insulation defects inside the transformer during actual operation can be accurately assessed, which can strongly support the safe and stable operation of ultra-high voltage transformers. Attached Figure Description

[0034] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0035] Figure 1 This is a structural diagram of the high-voltage transformer ultrasonic and ultra-high frequency signal synchronous detection system according to an embodiment of the present invention;

[0036] Figure 2 This is the original ultra-high frequency signal of type I partial discharge excited by defects in the oil paper of the high-voltage transformer according to an embodiment of the present invention;

[0037] Figure 3 This invention relates to a spectrum analysis of the ultra-high frequency signal of type I partial discharge excited by defects in the oil paper of a high-voltage transformer.

[0038] Figure 4 This is the original ultrasonic signal of type I partial discharge excited by defects in the oil paper of a high-voltage transformer according to an embodiment of the present invention;

[0039] Figure 5 This is the original ultra-high frequency signal of type II partial discharge excited by defects in the oil paper of the high-voltage transformer according to an embodiment of the present invention;

[0040] Figure 6 This invention relates to a spectrum analysis of the ultra-high frequency signal of type II partial discharge excited by defects in the oil paper of a high-voltage transformer.

[0041] Figure 7 This is the original ultrasonic signal of type I partial discharge excited by defects in the oil paper of a high-voltage transformer according to an embodiment of the present invention. Detailed Implementation

[0042] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0043] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0044] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0045] Therefore, clarifying the changing patterns of relevant physical monitoring quantities during the discharge process of oil-paper insulation, studying the development process of oil-paper defect discharge, and conducting development stage assessments are of great research value and engineering significance for the condition assessment of oil-paper insulation and the prevention of transformer faults.

[0046] To accurately monitor the electromagnetic signals of partial discharge generated by defects in the oil paper inside high-voltage transformers, a built-in ultra-high frequency (UHF) sensor is installed in the transformer tank wall, with a main sensing frequency band of 100MHz-2000MHz. The sensor is connected to the UHF conditioning unit, with the connecting cable not exceeding 15 meters. The UHF conditioning unit filters and amplifies the electromagnetic wave signals received by the sensor, mainly in the 100MHz-1000MHz frequency band, with an amplification gain of 40dB. The UHF acquisition unit has a sampling rate of 2Gs / s and an analog bandwidth of 1GHz, enabling the acquisition of raw UHF signals. It adopts a channel threshold triggering mode and has a trigger output function.

[0047] The ultra-high frequency signal and the ultrasonic signal that occur synchronously with it in the high-voltage transformer oil-paper insulation defect development assessment method integrating acoustic and electrical signals in this embodiment of the invention employ, as follows: Figure 1 The ultrasonic and ultra-high frequency signals of the transformer shown were acquired by a synchronous detection system.

[0048] To monitor ultrasonic signals synchronized with partial discharge electromagnetic signals, an ultrasonic sensor is installed on the outer wall of the high-voltage transformer, with a main sensing frequency band of 10kHz-400kHz. The sensor is connected to an ultrasonic conditioning unit, with the connecting cable not exceeding 5 meters. The ultrasonic conditioning unit filters and amplifies the ultrasonic signals received by the sensor, primarily in the 20kHz-200kHz frequency band, with an amplification gain of 60dB. The ultrasonic acquisition unit has a sampling rate of 1Ms / s and an analog bandwidth of 500kHz, enabling the acquisition of raw ultrasonic signals. Using an external trigger mode, the trigger output of the UHF acquisition unit is used as the external trigger source to achieve ultrasonic signal acquisition synchronized with the UHF signal.

[0049] The UHF acquisition unit and the ultrasonic acquisition unit communicate with the monitoring terminal via TCP / IP protocol. The monitoring terminal controls and acquires data from the two acquisition units, pairs and stores the ultrasonic and UHF signals of the same source for analysis, identifies pulse types, and assesses the defect development stage.

[0050] In one or more embodiments, a method for assessing the development of defects in the oil-paper insulation of high-voltage transformers that integrates acoustic and electrical components is provided, which may include the following steps S1 to S3.

[0051] The specific implementation process of steps S1 to S3 is as follows:

[0052] Step S1: Extract the UHF signal characteristics and the ultrasonic signal characteristics that occur synchronously with the oil-paper insulation defects in the ultra-high voltage transformer, and identify the partial discharge category, which includes Class I partial discharge and Class II partial discharge.

[0053] During the development and deterioration of oil-paper insulation defects in ultra-high voltage and extra-high voltage transformers, different types of partial discharge signals are generated, and the accompanying ultra-high frequency (UHF) and ultrasonic signal characteristics also show significant differences. Therefore, in order to accurately assess the development status of insulation defects, it is necessary to use a high-voltage transformer ultrasonic and UHF signal synchronous detection system to capture the UHF and ultrasonic signals occurring inside the transformer in real time. At the monitoring terminal, the partial discharge pulses are classified and statistically analyzed in real time by identifying the characteristics of UHF and ultrasonic signals.

[0054] The ultra-high frequency signal that induces type I partial discharge during the development of oil-paper insulation defects in ultra-high voltage transformers, such as... Figure 2 As shown, the duration of the original UHF signal is less than 350 ns, and the peak value is less than 200 mV. The normalized spectral distribution of this UHF signal is as follows. Figure 3 As shown, the main frequencies are distributed between 250MHz and 350MHz, with the main frequency points at 260MHz and 320MHz. Ultrasonic signals that occur synchronously with UHF signals include... Figure 4 As shown, the duration of the ultrasonic signal is less than 6ms and the peak value is less than 150mV.

[0055] UHF signals that induce type II partial discharge during the development of defects in the oil-paper insulation of ultra-high voltage transformers, such as... Figure 5 As shown, the original UHF signal has a duration greater than 500 ns, a peak value exceeding 200 mV, but less than 300 mV. The normalized spectral distribution of this UHF signal is as follows: Figure 6 As shown, the main frequency distribution is between 100MHz and 300MHz, with the main frequency points at 120MHz, 190MHz, and 260MHz. Compared to Type I partial discharge pulses, the low-frequency components are more abundant. Ultrasonic signals that occur synchronously with UHF signals include... Figure 7 As shown, the duration of the ultrasonic signal exceeds 8ms, the peak value is greater than 9V, and the ultrasonic signal excited by the type II partial discharge pulse is more significant.

[0056] Step S2: Based on the statistically obtained Type I partial discharge pulse... tTotal number of times within seconds N I ( t ) and Class II partial discharge pulse t Total number of times within seconds N II ( t ), to obtain the percentage of the Type I partial discharge pulse at second t. P I ( t ), the first type of partial discharge pulse t Rate of change of the number of seconds R I ( t ) and Class II partial discharge pulse t Rate of change of the number of seconds R II ( t ), and then according to R I ( t )and R II ( t The pulse change rate is obtained by weighted summation. R ( t );

[0057] Step S3: Integration N I ( t )and N II ( t The result of comparing the accumulated sum with the set first threshold N II ( t Is it 0? P I ( t The comparison results with the set second threshold and R ( t The results are compared with the set third threshold to assess the development stage of internal oil paper defects in ultra-high voltage transformers.

[0058] It should be noted that the first, second, and third thresholds were all obtained through simulation tests of Class I and Class II partial discharges occurring inside the transformer.

[0059] In this embodiment, preferably, the first threshold is set to 50; the second threshold is set to 60%; and the third threshold is set to 60%.

[0060] The variation of the number of Type I and Type II partial discharge pulses inside the transformer was captured in real time using a synchronous detection system of ultrasonic and ultra-high frequency signals for high-voltage transformers, and the development and deterioration state of oil-paper insulation defects were assessed. NI ( t () is the first type of partial discharge pulse. t Total number of times within seconds N II ( t () is the Class II partial discharge pulse t Total number of times within seconds. P I ( t () is the first type of partial discharge pulse. t The percentage of seconds is obtained from formula (1). R I ( t () is the first type of partial discharge pulse. t The rate of change of the number of seconds, R II ( t () is the Class II partial discharge pulse t Rate of change of the number of seconds, rate of change of the pulse R ( t The result is obtained from formula (2), where N I ( t-1 ) represents the first type of partial discharge pulse. t-1 Total number of times within seconds N II ( t-1 ) indicates the type II partial discharge pulse. t-1 Total number of times within seconds.

[0061] (1);

[0062] (2);

[0063] when N I ( t )+ N II ( t <50 or N II ( t When )=0, the internal oil paper defects of the high-voltage transformer are in the initial development stage.

[0064] when N I ( t )+ N II ( t ≥50, N II ( t ) > 0, and P I( t ≤60% or R ( t When the percentage is ≤60%, the internal oil-paper defects of the high-voltage transformer are in a stable development stage.

[0065] when N I ( t )+ N II ( t ≥50, N II ( t ) > 0, and P I ( t >60% or R ( t When the percentage is greater than 60%, the internal oil-paper defects of the high-voltage transformer are in a rapid development stage.

[0066] when N I ( t )+ N II ( t ≥50, N II ( t ) > 0, and P I ( t >60% and R ( t When the percentage of defects in the oil paper inside the high-voltage transformer exceeds 60%, the transformer is in a state of near breakdown.

[0067] This embodiment can accurately identify the type of partial discharge based on ultrasonic and ultra-high frequency partial discharge monitoring signals, and calculate the percentage of the first type of partial discharge pulse in second t. P I ( t ), the first type of partial discharge pulse t Rate of change of the number of seconds R I ( t ) and Class II partial discharge pulse t Rate of change of the number of seconds R II ( t ) and pulse change rate R ( t By comparing the results with the corresponding threshold, the development stage of the oil-paper insulation defects inside the transformer during actual operation can be accurately assessed, which can strongly support the safe and stable operation of ultra-high voltage transformers.

[0068] In one or more embodiments, a high-voltage transformer oil-paper insulation defect development assessment system integrating acoustic and electronic methods is also provided, which can be implemented in software. The high-voltage transformer oil-paper insulation defect development assessment system integrating acoustic and electronic methods includes the following software modules:

[0069] (1) Partial discharge identification module, which is used to extract the UHF signal characteristics and the ultrasonic signal characteristics that appear synchronously with the oil paper insulation defects in the ultra-high voltage transformer, and identify the partial discharge category, including Class I partial discharge and Class II partial discharge.

[0070] During the development and deterioration of oil-paper insulation defects in ultra-high voltage and extra-high voltage transformers, different types of partial discharge signals are generated, and the accompanying ultra-high frequency (UHF) and ultrasonic signal characteristics also show significant differences. Therefore, in order to accurately assess the development status of insulation defects, it is necessary to use a high-voltage transformer ultrasonic and UHF signal synchronous detection system to capture the UHF and ultrasonic signals occurring inside the transformer in real time. At the monitoring terminal, the partial discharge pulses are classified and statistically analyzed in real time by identifying the characteristics of UHF and ultrasonic signals.

[0071] The ultra-high frequency signal that induces type I partial discharge during the development of oil-paper insulation defects in ultra-high voltage transformers, such as... Figure 2 As shown, the duration of the original UHF signal is less than 350 ns, and the peak value is less than 200 mV. The normalized spectral distribution of this UHF signal is as follows. Figure 3 As shown, the main frequencies are distributed between 250MHz and 350MHz, with the main frequency points at 260MHz and 320MHz. Ultrasonic signals that occur synchronously with UHF signals include... Figure 4 As shown, the duration of the ultrasonic signal is less than 6ms and the peak value is less than 150mV.

[0072] UHF signals that induce type II partial discharge during the development of defects in the oil-paper insulation of ultra-high voltage transformers, such as... Figure 5 As shown, the original UHF signal has a duration greater than 500 ns, a peak value exceeding 200 mV, but less than 300 mV. The normalized spectral distribution of this UHF signal is as follows: Figure 6 As shown, the main frequency distribution is between 100MHz and 300MHz, with the main frequency points at 120MHz, 190MHz, and 260MHz. Compared to Type I partial discharge pulses, the low-frequency components are more abundant. Ultrasonic signals that occur synchronously with UHF signals include... Figure 7 As shown, the duration of the ultrasonic signal exceeds 8ms, the peak value is greater than 9V, and the ultrasonic signal excited by the type II partial discharge pulse is more significant.

[0073] (2) Partial discharge pulse parameter calculation module, which uses the first type of partial discharge pulse obtained from statistics as the parameter calculation module. tTotal number of times within seconds N I ( t ) and Class II partial discharge pulse t Total number of times within seconds N II ( t ), to obtain the percentage of the Type I partial discharge pulse at second t. P I ( t ), the first type of partial discharge pulse t Rate of change of the number of seconds R I ( t ) and Class II partial discharge pulse t Rate of change of the number of seconds R II ( t ), and then according to R I ( t )and R II ( t The pulse change rate is obtained by weighted summation. R ( t );

[0074] (3) The assessment module for the development stage of defects in oiled paper, which uses comprehensive... N I ( t )and N II ( t The result of comparing the accumulated sum with the set first threshold N II ( t Is it 0? P I ( t The comparison results with the set second threshold and R ( t The results are compared with the set third threshold to assess the development stage of internal oil paper defects in ultra-high voltage transformers.

[0075] In this embodiment, preferably, the first threshold is set to 50; the second threshold is set to 60%; and the third threshold is set to 60%.

[0076] The variation of the number of Type I and Type II partial discharge pulses inside the transformer was captured in real time using a synchronous detection system of ultrasonic and ultra-high frequency signals for high-voltage transformers, and the development and deterioration state of oil-paper insulation defects were assessed. N I ( t () is the first type of partial discharge pulse. t Total number of times within secondsN II ( t () is the Class II partial discharge pulse t Total number of times within seconds.

[0077] P I ( t () is the first type of partial discharge pulse. t The percentage of seconds is:

[0078] ;

[0079] R I ( t () is the first type of partial discharge pulse. t The rate of change of the number of seconds, R II ( t () is the Class II partial discharge pulse t Rate of change of the number of seconds, rate of change of the pulse R ( t The formula for ) is as follows, where N I ( t-1 ) represents the first type of partial discharge pulse. t- 1 Total number of times within seconds N II ( t-1 ) indicates the type II partial discharge pulse. t-1 Total number of times within seconds.

[0080] ;

[0081] when N I ( t )+ N II ( t <50 or N II ( t When )=0, the internal oil paper defects of the high-voltage transformer are in the initial development stage.

[0082] when N I ( t )+ N II ( t ≥50, N II ( t ) > 0, and P I ( t≤60% or R ( t When the percentage is ≤60%, the internal oil-paper defects of the high-voltage transformer are in a stable development stage.

[0083] when N I ( t )+ N II ( t ≥50, N II ( t ) > 0, and P I ( t >60% or R ( t When the percentage is greater than 60%, the internal oil-paper defects of the high-voltage transformer are in a rapid development stage.

[0084] when N I ( t )+ N II ( t ≥50, N II ( t ) > 0, and P I ( t >60% and R ( t When the percentage of defects in the oil paper inside the high-voltage transformer exceeds 60%, the transformer is in a state of near breakdown.

[0085] It should be noted that each module in the acoustic-electric integrated high-voltage transformer oil-paper insulation defect development assessment system of the present invention corresponds one-to-one with each step in the acoustic-electric integrated high-voltage transformer oil-paper insulation defect development assessment method of the above embodiments, and their specific implementation processes are the same, which will not be repeated here.

[0086] The structure of the electronic device according to an embodiment of the present invention will be described in detail below. The electronic device provided in this embodiment includes at least one processor, a memory, a user interface, and at least one network interface. The various components in the integrated acoustic and electrical high-voltage transformer oil-paper insulation defect development assessment system are coupled together through a bus system. It can be understood that the bus system is used to realize the connection and communication between these components. In addition to a data bus, the bus system also includes a power bus, a control bus, and a status signal bus. The user interface may include a display, keyboard, mouse, trackball, click wheel, buttons, a touchpad, or a touch screen, etc.

[0087] It is understood that the memory can be volatile memory or non-volatile memory, or both. The memory in this embodiment of the invention is capable of storing data to support the operation of the terminal. Examples of this data include any computer programs used to operate on the terminal, such as operating systems and applications. The operating system includes various system programs, such as the framework layer, core library layer, driver layer, etc., used to implement various basic services and handle hardware-based tasks. Applications can include various applications.

[0088] In some embodiments, the acoustic-electric integrated high-voltage transformer oil-paper insulation defect development assessment system provided in this invention can be implemented using a combination of hardware and software. As an example, the acoustic-electric integrated high-voltage transformer oil-paper insulation defect development assessment system provided in this invention can be a processor in the form of a hardware decoding processor, programmed to execute the acoustic-electric integrated high-voltage transformer oil-paper insulation defect development assessment method provided in this invention. For example, the hardware decoding processor can employ one or more application-specific integrated circuits (ASICs), DSPs, programmable logic devices (PLDs), complex programmable logic devices (CPLDs), field-programmable gate arrays (FPGAs), or other electronic components.

[0089] As an example, a processor can be an integrated circuit chip with signal processing capabilities, such as a general-purpose processor, a digital signal processor (DSP), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc., where a general-purpose processor can be a microprocessor or any conventional processor, etc.

[0090] As an example of the hardware implementation of the high-voltage transformer oil-paper insulation defect development assessment system integrating acoustic and electronic components provided in this embodiment of the invention, the device provided in this embodiment of the invention can be directly executed by a processor in the form of a hardware decoding processor. For example, it can be executed by one or more application-specific integrated circuits (ASICs), DSPs, programmable logic devices (PLDs), complex programmable logic devices (CPLDs), field-programmable gate arrays (FPGAs), or other electronic components to implement the high-voltage transformer oil-paper insulation defect development assessment method integrating acoustic and electronic components provided in this embodiment of the invention.

[0091] The memory in this embodiment of the invention is used to store various types of data to support the operation of the acoustic-electric integrated high-voltage transformer oil-paper insulation defect development assessment system, or to store program code for executing the methods described above. Examples of such data include: any executable instructions for operating on the acoustic-electric integrated high-voltage transformer oil-paper insulation defect development assessment system, such as executable instructions, and programs implementing the acoustic-electric integrated high-voltage transformer oil-paper insulation defect development assessment method of this embodiment of the invention may be included in the executable instructions.

[0092] Specifically, according to embodiments of this application, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, embodiments of this application include a computer program product comprising a computer program carried on a computer-readable medium, the computer program containing program code for performing the methods described above. In such embodiments, the computer program can be downloaded and installed from a network via a communication component, and / or installed from a removable medium. When the computer program is executed by a central processing unit, it performs the various functions defined in the apparatus of this application.

[0093] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, as well as combinations of blocks in the flowchart illustrations 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, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart. Figure 1 One or more processes and / or boxes Figure 1A device that provides the functions specified in one or more boxes.

[0094] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for assessing the development of defects in the oil-paper insulation of high-voltage transformers by integrating acoustic and electrical methods, characterized in that, include: The characteristics of ultra-high frequency signals and synchronous ultrasonic signals during the development of oil-paper insulation defects in ultra-high voltage transformers were extracted to identify the types of partial discharge, including Type I partial discharge and Type II partial discharge. Based on the statistically obtained Type I partial discharge pulse, the... t Total number of times within seconds N I ( t ) and Class II partial discharge pulse t Total number of times within seconds N II ( t ), to obtain the percentage of the Type I partial discharge pulse at second t. P I ( t ), the first type of partial discharge pulse t Rate of change of the number of seconds R I ( t ) and Class II partial discharge pulse t Rate of change of the number of seconds R II ( t ), and then according to R I ( t )and R II ( t The pulse change rate is obtained by weighted summation. R ( t ); comprehensive N I ( t )and N II ( t The result of comparing the accumulated sum with the set first threshold N II ( t Is it 0? P I ( t The comparison results with the set second threshold and R ( t The results are compared with the set third threshold to assess the development stage of internal oil-paper defects in ultra-high voltage transformers. when N I ( t )+ N II ( t < first threshold or N II ( t When )=0, the internal oil paper defects of the high-voltage transformer are in the initial development stage; when N I ( t )+ N II ( t )≥first threshold, N II ( t ) > 0, and P I ( t )≤ second threshold or R ( t When the value is less than or equal to the third threshold, the oil-paper defects inside the high-voltage transformer are in a stable development stage. when N I ( t )+ N II ( t )≥first threshold, N II ( t ) > 0, and P I ( t > second threshold or R ( t When the threshold value exceeds the third threshold, the internal oil-paper defects of the high-voltage transformer are in a rapid development stage. when N I ( t )+ N II ( t )≥first threshold, N II ( t ) > 0, and P I ( t ) > second threshold and R ( t When the value exceeds the third threshold, the internal oil paper defect of the high-voltage transformer is in a state of imminent breakdown.

2. The method for assessing the development of defects in the oil-paper insulation of high-voltage transformers integrating acoustic and electrical components as described in claim 1, characterized in that, The ultra-high frequency signal characteristics corresponding to the type I partial discharge induced during the development of oil-paper insulation defects in ultra-high voltage transformers, and the ultrasonic signal characteristics that occur simultaneously with it are as follows: The duration of the original ultra-high frequency signal is less than 350 ns, and the peak value is less than 200 mV; The original UHF signal frequency distribution is between 250MHz and 350MHz, with frequency points distributed at 260MHz and 320MHz; The duration of the ultrasonic signal is less than 6ms and the peak value is less than 150mV.

3. The method for assessing the development of defects in the oil-paper insulation of high-voltage transformers integrating acoustic and electrical components as described in claim 1, characterized in that... The characteristics of the ultra-high frequency signal corresponding to the type II partial discharge induced during the development of oil-paper insulation defects in ultra-high voltage transformers and the characteristics of the ultrasonic signal that occurs simultaneously with it are as follows: The duration of the original UHF signal is greater than 500 ns, the peak value exceeds 200 mV, and the peak value is less than 300 mV; The original UHF signal frequency distribution is between 100MHz and 300MHz, with frequency points distributed at 120MHz, 190MHz and 260MHz. The ultrasonic signal duration exceeds 8ms and the peak value is greater than 9V.

4. A high-voltage transformer oil-paper insulation defect development assessment system integrating acoustic and electrical components, characterized in that, The method for assessing the development of defects in the oil-paper insulation of high-voltage transformers based on the integration of acoustic and electrical systems as described in any one of claims 1-3 includes: The partial discharge identification module is used to extract the ultra-high frequency signal characteristics and the ultrasonic signal characteristics that occur simultaneously with the oil-paper insulation defects in ultra-high voltage transformers, and to identify the partial discharge category, which includes Class I partial discharge and Class II partial discharge. The partial discharge pulse parameter calculation module uses the statistically obtained first-order partial discharge pulse parameter to calculate the first-order partial discharge pulse parameter. t Total number of times within seconds N I ( t ) and Class II partial discharge pulse t Total number of times within seconds N II ( t ), to obtain the percentage of the Type I partial discharge pulse at second t. P I ( t ), the first type of partial discharge pulse t Rate of change of the number of seconds R I ( t ) and Class II partial discharge pulse t Rate of change of the number of seconds R II ( t ), and then according to R I ( t )and R II ( t The pulse change rate is obtained by weighted summation. R ( t ); The oil paper defect development stage assessment module uses a comprehensive approach. N I ( t )and N II ( t The result of comparing the accumulated sum with the set first threshold N II ( t Is it 0? P I ( t The comparison results with the set second threshold and R ( t The results are compared with the set third threshold to assess the development stage of internal oil paper defects in ultra-high voltage transformers.

5. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the program is executed by the processor, it implements the steps in the method for assessing the development of defects in the oil-paper insulation of high-voltage transformers that integrates acoustic and electrical systems as described in any one of claims 1-3.

6. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the steps in the method for assessing the development of defects in the oil-paper insulation of high-voltage transformers that integrates acoustic and electrical systems as described in any one of claims 1-3.

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