Partial discharge analysis method and device of power transformation equipment and medium

Abstract

The invention discloses a partial discharge analysis method and device of power transformation equipment and a medium. The method comprises the following steps: collecting current signals at a plurality of preset monitoring positions of the power transformation equipment; respectively calculating normalized current signal energy of the current signal at each monitoring position; performing overvoltage modal analysis according to the normalized current signal energy, and determining an overvoltage modal of the power transformation equipment; extracting partial discharge characteristics of each monitoring position according to the overvoltage mode; and performing analysis based on the partial discharge characteristics and pre-stored comparison data, and determining the partial discharge type of the power transformation equipment.

Description

Technical Field

[0001] The present invention relates to the technical field of power equipment status assessment, and more specifically, to a method, device, and medium for partial discharge analysis of substation equipment. Background Art

[0002] In the power system, the safe and stable operation of substation equipment is of crucial importance. Special operating conditions such as switch opening and closing operations and the system being struck by lightning will generate overvoltage phenomena, including internal overvoltage and external overvoltage, which are one of the main factors threatening the insulation safety of substation equipment. According to statistics, the proportion of foreign object discharge faults excited by overvoltage and vibration during the operation of gas-insulated metal-enclosed switchgear (GIS equipment) is about 55% or more. Therefore, by extracting the high-frequency current of substation equipment, based on the identification of overvoltage, analyzing the phase distribution of the high-frequency current, and judging whether the overvoltage generated by the operation or lightning strike has an impact on the equipment insulation. Therefore, how to accurately and efficiently express the equipment insulation state has become an urgent technical problem to be solved. Summary of the Invention

[0003] Aiming at the deficiencies of the prior art, the present invention provides a method, device, and medium for partial discharge analysis of substation equipment.

[0004] According to one aspect of the present invention, a method for partial discharge analysis of substation equipment is provided, including:

[0005] Collecting current signals at multiple preset monitoring positions of the substation equipment;

[0006] Calculating the normalized current signal energy of the current signals at each monitoring position respectively;

[0007] Performing overvoltage mode analysis based on the normalized current signal energy to determine the overvoltage mode of the substation equipment;

[0008] Extracting partial discharge characteristics of each monitoring position according to the overvoltage mode;

[0009] Analyzing based on the partial discharge characteristics and the pre-stored comparison data to determine the partial discharge type of the substation equipment.

[0010] Optionally, the monitoring positions include: GIS jumper, arrester grounding lead, transformer bushing end screen, and transformer core grounding lead.

[0011] Optionally, the calculation expression of the normalized current signal energy is:

[0012]

[0013] Wherein, u is the current signal matrix; P(k) is the overvoltage energy contained in the current signal collected by the k-th sensor, t is the time window (1 < t < N), N is the number of sampling points, i is the i-th sampling point of the sensor, and u k is the frequency modulation signal of the current signal collected by the k-th sensor.

[0014] Optionally, overvoltage mode analysis is performed according to the normalized current signal energy to determine the overvoltage mode of the substation equipment, including:

[0015] Select the normalized current signal energy at any monitoring position as the parameter value;

[0016] If the reference value is 0 and the normalized current signal energy at the remaining monitoring positions is also 0, it is determined that the overvoltage mode of the substation equipment has not experienced an overvoltage condition;

[0017] If the reference value is greater than 0 and the normalized current signal energy at the remaining monitoring positions is 0, it is determined that the overvoltage mode of the substation equipment has experienced a line overvoltage;

[0018] If the reference value is 0 and the normalized current signal energy at the remaining monitoring positions is greater than 0, it is determined that the overvoltage mode of the substation equipment is GIS switching operation.

[0019] Optionally, the comparison data includes: partial discharge phase width, ratio of the number of discharges in the positive and negative half cycles, ratio of the average discharge amplitudes in the positive and negative half cycles, discharge amplitude entropy value, and maximum discharge amplitude entropy value.

[0020] Optionally, local discharge characteristics of each monitoring position are extracted according to the overvoltage mode, including:

[0021] In the case where the overvoltage mode is experiencing a line overvoltage, the current signals collected by the arrester grounding lead sensor and the transformer bushing end screen sensor are extracted as local discharge characteristics;

[0022] In the case where the overvoltage mode is GIS switching operation, the current signals collected by the GIS jumper and the transformer core grounding lead sensor are extracted as local discharge characteristics.

[0023] According to another aspect of the present invention, a local discharge analysis device for substation equipment is provided, including:

[0024] A collection module for collecting current signals at multiple preset monitoring positions of the substation equipment;

[0025] A calculation module for respectively calculating the normalized current signal energy of the current signals at each monitoring position;

[0026] An analysis module, configured to perform overvoltage mode analysis based on the normalized current signal energy to determine the overvoltage mode of the substation equipment;

[0027] An extraction module, configured to extract the partial discharge characteristics of each monitoring position according to the overvoltage mode;

[0028] A determination module, configured to perform analysis based on the partial discharge characteristics and the pre-stored comparison data to determine the partial discharge type of the substation equipment.

[0029] According to another aspect of the present invention, there is provided a computer-readable storage medium storing a computer program for executing the method described in any of the above aspects of the present invention.

[0030] According to another aspect of the present invention, there is provided an electronic device, including: a processor; a memory for storing executable instructions of the processor; the processor is configured to read the executable instructions from the memory and execute the instructions to implement the method described in any of the above aspects of the present invention.

[0031] Therefore, the current sensing array container expression method for substation equipment based on overvoltage recognition in the present invention conducts multi-point array monitoring on transformers, arresters, and GIS equipment at a certain UHV substation, captures the overvoltage signals excited by the opening and closing of a certain circuit breaker and the partial discharge of internal insulating parts of the GIS, and avoids major faults of UHV substation equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] By referring to the following drawings, the exemplary embodiments of the present invention can be more fully understood:

[0033] Figure 1 is a schematic flowchart of a partial discharge analysis method for substation equipment provided by an exemplary embodiment of the present invention;

[0034] Figure 2 is a schematic layout diagram of a substation equipment synchronous monitoring unit provided by an exemplary embodiment of the present invention;

[0035] Figure 3 is a schematic diagram of a state expression container module provided by an exemplary embodiment of the present invention;

[0036] Figure 4 is an insulation defect map excited by the action of a PRPD circuit breaker in the CT gas chamber on the II bus side provided by an exemplary embodiment of the present invention;

[0037] Figure 5 is an insulation defect map excited by the action of a PRPS circuit breaker in the CT gas chamber on the II bus side provided by an exemplary embodiment of the present invention;

[0038] Figure 6 It is the insulation defect map excited at the moment when the PRPD breaker in the CT gas chamber on the I busbar side provided by an exemplary embodiment of the present invention operates;

[0039] Figure 7 It is the insulation defect map excited at the moment when the PRPS breaker in the CT gas chamber on the I busbar side provided by an exemplary embodiment of the present invention operates;

[0040] Figure 8 It is the structural schematic diagram of the partial discharge analysis device for substation equipment provided by an exemplary embodiment of the present invention;

[0041] Figure 9 It is the structure of the electronic device provided by an exemplary embodiment of the present invention. Detailed implementation manners

[0042] Next, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments of the present invention. It should be understood that the present invention is not limited by the exemplary embodiments described herein.

[0043] It should be noted that: unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present invention.

[0044] Those skilled in the art can understand that terms such as "first" and "second" in the embodiments of the present invention are only used to distinguish different steps, devices, or modules, etc., and neither represent any specific technical meaning nor indicate an inevitable logical order between them.

[0045] It should also be understood that in the embodiments of the present invention, "a plurality" may refer to two or more, and "at least one" may refer to one, two, or more.

[0046] It should also be understood that for any component, data, or structure mentioned in the embodiments of the present invention, without clear definition or contrary indication in the context, it can generally be understood as one or more.

[0047] In addition, the term "and / or" in the present invention is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in the present invention generally represents an "or" relationship between the associated objects before and after.

[0048] It should also be understood that the present invention emphasizes the differences between the various embodiments, and the same or similar parts can be referred to each other. For the sake of brevity, they will not be described in detail one by one.

[0049] Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the drawings are not drawn in actual proportional relationships.

[0050] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way a limitation on the present invention, its application, or its use.

[0051] Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and devices should be regarded as part of the specification.

[0052] It should be noted that like reference numerals and letters indicate like items in the following figures, and thus, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0053] Embodiments of the present invention can be applied to electronic devices such as terminal devices, computer systems, servers, etc., which can operate together with numerous other general-purpose or special-purpose computing system environments or configurations. Examples of well-known terminal devices, computing systems, environments, and / or configurations suitable for use with terminal devices, computer systems, servers, etc. include, but are not limited to: personal computer systems, server computer systems, thin clients, thick clients, handheld or laptop devices, microprocessor-based systems, set-top boxes, programmable consumer electronics, network personal computers, minicomputer systems, mainframe computer systems, and distributed cloud computing technology environments including any of the above systems, and so on.

[0054] Terminal devices, computer systems, servers, etc. can be described in the general context of computer system-executable instructions (such as program modules) executed by a computer system. Generally, program modules can include routines, programs, object programs, components, logic, data structures, etc., which perform specific tasks or implement specific abstract data types. The computer system / server can be implemented in a distributed cloud computing environment where tasks are executed by remote processing devices linked through a communication network. In a distributed cloud computing environment, program modules can be located on local or remote computing system storage media including storage devices.

[0055] Exemplary method

[0056] Figure 1 It is a schematic flowchart of a partial discharge analysis method for a power transformation device provided by an exemplary embodiment of the present invention. This embodiment can be applied to an electronic device, such as Figure 1 As shown, the partial discharge analysis method 100 for the power transformation device includes the following steps:

[0057] Step 101: Collect current signals at multiple preset monitoring positions of the substation equipment;

[0058] Step 102: Calculate the normalized current signal energy of the current signals at each monitoring position respectively;

[0059] Step 103: Conduct overvoltage mode analysis based on the normalized current signal energy to determine the overvoltage mode of the substation equipment;

[0060] Step 104: Extract the partial discharge characteristics of each monitoring position according to the overvoltage mode;

[0061] Step 105: Analyze based on the partial discharge characteristics and the pre-stored comparison data to determine the partial discharge type of the substation equipment.

[0062] Specifically, the present invention uses a distributed monitoring mode, that is, sensor arrays deployed at multiple positions of the power equipment simultaneously monitor the overvoltage current signals and the discharge signals of internal defects, and then the container algorithm is used for state expression, reducing the calculation amount and calculation time. The core lies in using the current sensing array to monitor the current in the substation equipment in real time. The current sensing array consists of multiple high-precision current sensors, which can capture the tiny changes in the current signal, so as to achieve a sensitive response to overvoltage events. By collecting and analyzing these current data, characteristic parameters related to overvoltage can be extracted, such as the changes in the current waveform, the increase or decrease of the amplitude, etc., and then the accurate identification of overvoltage events can be realized.

[0063] In addition, the container expression method plays an important role in this technology. The container expression method is a technical means for structuring and standardizing complex data and information. It can effectively integrate and manage the large amount of data collected by the current sensing array, facilitating subsequent data analysis and decision support. Through the container expression method, the current data can be associated with overvoltage events, establishing a complete monitoring and identification system, providing a strong guarantee for the safe operation of the power system.

[0064] Thus, the present invention proposes a method for analyzing partial discharge of substation equipment. Through array-type synchronous monitoring by current sensors distributed at different positions of the substation equipment, the overvoltage current signals and partial discharge signals are identified, and the insulation state of the equipment is efficiently expressed through the container processing method, ensuring the safe and stable operation of the equipment. The specific implementation process is as follows:

[0065] 1. Substation equipment synchronous monitoring unit

[0066] The synchronous monitoring unit of substation equipment consists of multiple high-frequency current sensors installed on the GIS jumper, the grounding lead of the lightning arrester, the end screen of the transformer bushing, and the grounding lead of the transformer core, a high-frequency current receiving module, and a state expression container module. The sensors are wireless sensors, and the equipment current information is monitored synchronously at the same time. The layout schematic diagram is as Figure 2 shown:

[0067] Figure 2 In the figure, the GIS jumper sensor, the lightning arrester grounding lead sensor, the transformer bushing end screen sensor, and the transformer core grounding lead sensor collect data simultaneously to monitor the partial discharge signals generated inside the equipment, as well as the overvoltage signals caused by abnormal working conditions such as GIS equipment operation and lightning arrester being struck by lightning. The signals are transmitted to the high-frequency current receiving module via wireless communication, and then the state expression container is used to identify overvoltage and judge partial discharge events.

[0068] Refer to Figure 3 shown. The state expression container module consists of a data perception container and a terminal control container. The data perception container is divided into area a1, and the terminal control container includes areas a2 and a3, which are used to analyze overvoltage modes and identify partial discharge types respectively.

[0069] 2. Overvoltage signal identification method and process based on synchronous monitoring

[0070] In the first step, the high-frequency current receiving module extracts the frequency modulation signal u of the current signal collected by each sensor k . The sensors and the corresponding collected signals are numbered as k. Taking Figure 2 as an example, the currents obtained by the No. 1 GIS jumper sensor, the No. 2 GIS jumper sensor, the lightning arrester grounding lead sensor, the transformer bushing end screen sensor, and the transformer core grounding lead sensor are u1 to u5. The current signals are represented in matrix form. When the number of sampling points is N, the matrix expression is:

[0071]

[0072] In the second step, the state expression container module calculates the normalized current signal energy.

[0073]

[0074] Among them, P(k) is the overvoltage energy contained in the current signal collected by the kth sensor, t is the time window (1 < t < N), and i is the ith sampling point of the sensor.

[0075] In the third step, the state expression container module performs overvoltage mode analysis. Randomly select the current signal energy of the lightning arrester grounding lead sensor (for example, P(3)) as the reference value, and compare the remaining current signal energies with the reference value.

[0076] Case 1: The reference value is 0 and the energies of the remaining current signals are also 0, indicating that the main substation equipment has not experienced overvoltage conditions.

[0077] Case 2: The reference value is greater than 0 and the energies of the remaining current signals are 0, indicating that the main substation equipment has experienced line overvoltage.

[0078] Case 3: The reference value is 0 and the energies of the remaining current signals are greater than 0, indicating that there are GIS switching operations.

[0079] 3. Expression method of current sensing array container

[0080] The first step is to access the signals of the data perception container. As Figure 3 shown, the sub-data u k received by each sensor is stored in the container area a1, and the overvoltage mode is called and calculated by the area a2.

[0081] The second step is that the state expression container module extracts the partial discharge characteristics of each monitoring position according to the overvoltage mode. The partial discharge phase width, the ratio of the number of discharges in the positive and negative half-cycles, the ratio of the average discharge amplitudes in the positive and negative half-cycles, the discharge amplitude entropy value, and the maximum discharge amplitude entropy value are stored in the area a3; when Case 2 occurs, the current signals collected by the arrester grounding lead sensor and the transformer bushing end screen sensor are retrieved to analyze the partial discharge type; when Case 3 occurs, the current signals collected by the GIS jumper 1 sensor, the GIS jumper 2 sensor, and the transformer core grounding lead sensor are retrieved to analyze the partial discharge type. Among them, the partial discharge type can be identified according to Appendix D of "Q / GDW 11059.2—2018 On-site Application Guide for Partial Discharge Live Testing Technology of Gas Insulated Metal Enclosed Switchgear Part 2 Ultra High Frequency Method", which will not be elaborated here.

[0082] The expression method of the current sensing array container of substation equipment based on overvoltage recognition conducts multi-point array monitoring of transformers, arresters, and GIS equipment in a certain UHV substation, captures the overvoltage signals excited by the switching of a certain circuit breaker and the partial discharge of the internal insulation parts of the GIS, and avoids major failures of UHV substation equipment.

[0083] In an embodiment of the present invention, the expression method of the current sensing array container of substation equipment based on overvoltage recognition conducts multi-point array monitoring of transformers, arresters, and GIS equipment in a certain UHV substation. At the moment when the circuit breaker operates, the switching overvoltage signal is recognized, and the insulation defects excited during the operation process are synchronously recognized, such as Figure 4 , Figure 5 , Figure 6 and Figure 7 shown.

[0084] After the circuit breaker operates, multiple re-breakdowns generated in the arc extinguishing chamber excite UHF partial discharges with an amplitude of about 250 mV. Among them, the action signal distribution on the II-bus side is about 100 - 130°, and the action signal distribution on the I-bus side is about 270°. Due to the extremely fast speed of the re-breakdown process of the circuit breaker arc extinguishing chamber contacts, the generated UHF signal frequency is much higher than that of conventional partial discharges. The overvoltage sensing module of the array sensor collects "dogtooth" signals with a higher amplitude and fewer discharge times within a single cycle.

[0085] The action signal propagates to the housing grounding bar sensor, and a partial discharge pattern is accumulated for 500 cycles (1 s). The pattern shows the characteristics of insulation defects. The signal disappears 2 s after the circuit breaker operates. The surface defect is excited by the circuit breaker operation. After the circuit breaker is closed for a period of time, the breaker contacts short-circuit the closing resistor and the grading capacitor, and the electric field is relatively uniform, so the discharge disappears.

[0086] Therefore, the present invention uses a distributed monitoring mode, that is, sensor arrays deployed at multiple positions of power equipment simultaneously monitor overvoltage current signals and discharge signals of internal defects, and then the container algorithm is used for state expression, reducing the calculation amount and calculation time. The core lies in using the current sensing array to monitor the current in the substation equipment in real time. The current sensing array is composed of multiple high-precision current sensors, which can capture the tiny changes in the current signal, so as to achieve a sensitive response to overvoltage events. By collecting and analyzing these current data, characteristic parameters related to overvoltage can be extracted, such as changes in the current waveform, increases and decreases in amplitude, etc., and then accurate identification of overvoltage events can be achieved.

[0087] Exemplary apparatus

[0088] Figure 8 It is a schematic structural diagram of a partial discharge analysis device for substation equipment provided by an exemplary embodiment of the present invention. As Figure 8 shown, the device 800 includes:

[0089] A collection module 810 for collecting current signals at multiple preset monitoring positions of the substation equipment;

[0090] A calculation module 820 for respectively calculating the normalized current signal energy of the current signals at each monitoring position;

[0091] An analysis module 830 for performing overvoltage mode analysis based on the normalized current signal energy to determine the overvoltage mode of the substation equipment;

[0092] An extraction module 840 for extracting partial discharge characteristics of each monitoring position according to the overvoltage mode;

[0093] A determination module 850 for analyzing based on the partial discharge characteristics and pre-stored comparison data to determine the partial discharge type of the substation equipment.

[0094] Optionally, the monitoring positions include: GIS jumper busbars, arrester grounding leads, the end screens of transformer bushings, and transformer core grounding leads.

[0095] Optionally, the calculation expression for the normalized current signal energy is:

[0096]

[0097] In the formula, u is the current signal matrix; P(k) is the overvoltage energy contained in the current signal collected by the k-th sensor, t is the time window (1 < t < N), N is the number of sampling points, i is the i-th sampling point of the sensor, and u k is the frequency modulation signal of the current signal collected by the k-th sensor.

[0098] Optionally, the analysis module 830 includes:

[0099] A selection sub-module, configured to select the normalized current signal energy at any monitoring position as the parameter value;

[0100] A first determination sub-module, configured to determine that the overvoltage mode of the substation equipment has not experienced an overvoltage condition if the reference value is 0 and the normalized current signal energies at the remaining monitoring positions are also 0;

[0101] A second determination sub-module, configured to determine that the overvoltage mode of the substation equipment has experienced a line overvoltage if the reference value is greater than 0 and the normalized current signal energies at the remaining monitoring positions are 0;

[0102] A third determination sub-module, configured to determine that the overvoltage mode of the substation equipment is a GIS switching operation if the reference value is 0 and the normalized current signal energies at the remaining monitoring positions are greater than 0.

[0103] Optionally, the comparison data includes: partial discharge phase width, ratio of the number of discharges in the positive and negative half-cycles, ratio of the average discharge amplitudes in the positive and negative half-cycles, discharge amplitude entropy value, and maximum discharge amplitude entropy value.

[0104] Optionally, the extraction module 840 includes:

[0105] A first extraction sub-module, configured to extract the current signals collected by the arrester grounding lead sensor and the end screen sensor of the transformer bushing as partial discharge characteristics when the overvoltage mode is experiencing a line overvoltage;

[0106] A second extraction sub-module, configured to extract the current signals collected by the GIS jumper busbar and the transformer core grounding lead sensor as partial discharge characteristics when the overvoltage mode is a GIS switching operation.

[0107] Exemplary electronic device

[0108] Figure 9 is the structure of an electronic device provided by an exemplary embodiment of the present invention. As Figure 9 shown, the electronic device 90 includes one or more processors 91 and a memory 92.

[0109] The processor 91 can be a central processing unit (CPU) or other forms of processing units with data processing capabilities and / or instruction execution capabilities, and can control other components in the electronic device to perform desired functions.

[0110] The memory 92 may include one or more computer program products, and the computer program products may include various forms of computer-readable storage media, such as volatile memory and / or non-volatile memory. The volatile memory may include, for example, random access memory (RAM) and / or cache memory, etc. The non-volatile memory may include, for example, read-only memory (ROM), hard disk, flash memory, etc. One or more computer program instructions may be stored on the computer-readable storage medium, and the processor 91 may run the program instructions to implement the methods of the software programs of the various embodiments of the present invention described above and / or other desired functions. In one example, the electronic device may further include: an input device 93 and an output device 94, and these components are interconnected through a bus system and / or other forms of connection mechanisms (not shown).

[0111] In addition, the input device 93 may further include, for example, a keyboard, a mouse, and so on.

[0112] The output device 94 can output various information to the outside. The output device 94 may include, for example, a display, a speaker, a printer, and a communication network and its connected remote output devices, and so on.

[0113] Of course, for simplicity, Figure 9 only some of the components related to the present invention in the electronic device are shown in , and components such as buses, input / output interfaces, etc. are omitted. In addition, according to specific application scenarios, the electronic device may further include any other appropriate components.

[0114] Exemplary computer program product and computer-readable storage medium

[0115] In addition to the above methods and devices, embodiments of the present invention may also be computer program products, which include computer program instructions that, when run by a processor, cause the processor to execute the steps in the methods according to various embodiments of the present invention described in the "Exemplary Methods" section above of this specification.

[0116] The computer program product can be written in any combination of one or more programming languages for executing the program code of the operations of the embodiments of the present invention. The programming languages include object-oriented programming languages such as Java, C++, etc., and also include conventional procedural programming languages such as the "C" language or similar programming languages. The program code can be executed entirely on the user's computing device, partially on the user's device, executed as an independent software package, partially on the user's computing device and partially on a remote computing device, or entirely on a remote computing device or server.

[0117] In addition, an embodiment of the present invention can also be a computer-readable storage medium storing computer program instructions, which, when run by a processor, cause the processor to execute the steps in the methods according to various embodiments of the present invention described in the "Exemplary Method" section above of this specification.

[0118] The computer-readable storage medium can adopt any combination of one or more readable media. The readable medium can be a readable signal medium or a readable storage medium. The readable storage medium can, for example, include but is not limited to an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the above. More specific examples (non-exhaustive list) of the readable storage medium include: an electrical connection having one or more wires, a portable disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above.

[0119] The basic principles of the present invention have been described above in conjunction with specific embodiments. However, it should be noted that the advantages, benefits, effects, etc. mentioned in the present invention are only examples and not limitations, and it cannot be considered that these advantages, benefits, effects, etc. are essential for each embodiment of the present invention. In addition, the above-disclosed specific details are only for the purposes of illustration and facilitating understanding, rather than limitations. The above details do not limit the present invention to necessarily adopt the above specific details for implementation.

[0120] Each embodiment in this specification is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. The same or similar parts among the embodiments can be referred to each other. For the system embodiments, since they basically correspond to the method embodiments, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiments.

[0121] The block diagrams of the devices, systems, apparatuses, and systems involved in the present invention are only illustrative examples and are not intended to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, systems, apparatuses, and systems can be connected, arranged, and configured in any manner. Words such as "including", "comprising", "having", etc. are open-ended terms, meaning "including but not limited to", and can be used interchangeably with each other. The word "or" and "and" used herein refer to the phrase "and / or", and can be used interchangeably with it, unless the context clearly indicates otherwise. The word "such as" used herein refers to the phrase "such as but not limited to", and can be used interchangeably with it.

[0122] The methods and systems of the present invention can be implemented in many ways. For example, the methods and systems of the present invention can be implemented by software, hardware, firmware, or any combination of software, hardware, and firmware. The above order of the steps for the methods is for illustration only, and the steps of the methods of the present invention are not limited to the specific order described above, unless otherwise specifically stated. In addition, in some embodiments, the present invention can also be implemented as a program recorded in a recording medium, and these programs include machine-readable instructions for implementing the methods according to the present invention. Therefore, the present invention also covers a recording medium storing a program for executing the methods according to the present invention.

[0123] It should also be noted that in the systems, apparatuses, and methods of the present invention, each component or each step can be decomposed and / or recombined. These decompositions and / or recombinations should be regarded as equivalent solutions of the present invention. The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of the present invention. Therefore, the present invention is not intended to be limited to the aspects shown herein, but rather to the broadest scope consistent with the principles and novel features disclosed herein.

[0124] The above description has been given for purposes of illustration and description. In addition, this description is not intended to limit the embodiments of the present invention to the forms disclosed herein. Although multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and subcombinations thereof.

Claims

1. A method for analyzing partial discharge of a power transformation device, characterized in that Including: Collecting current signals at multiple preset monitoring positions of substation equipment; Calculating the normalized current signal energy of the current signals at each monitoring position respectively; Performing overvoltage mode analysis based on the normalized current signal energy to determine the overvoltage mode of the substation equipment; Extracting partial discharge characteristics of each monitoring position according to the overvoltage mode; Performing analysis based on the partial discharge characteristics and pre-stored comparison data to determine the partial discharge type of the substation equipment.

2. The method according to claim 1, wherein The monitoring positions include: GIS jumper, arrester grounding lead, transformer bushing end shield, and transformer core grounding lead.

3. The method according to claim 1, wherein The calculation expression of the normalized current signal energy is: Wherein, u is a current signal matrix; P(k) is the overvoltage energy contained in the current signal collected by the k-th sensor, t is a time window (1 < t < N), N is the number of sampling points, i is the i-th sampling point of the sensor, and u k is the frequency modulation signal of the current signal collected by the k-th sensor.

4. The method according to claim 1, characterized in that Performing overvoltage mode analysis based on the normalized current signal energy to determine the overvoltage mode of the substation equipment, including: Selecting the normalized current signal energy at any monitoring position as the parameter value; If the reference value is 0 and the normalized current signal energies at the remaining monitoring positions are also 0, it is determined that the overvoltage mode of the substation equipment is not experiencing an overvoltage condition; If the reference value is greater than 0 and the normalized current signal energies at the remaining monitoring positions are 0, it is determined that the overvoltage mode of the substation equipment is experiencing a line overvoltage; If the reference value is 0 and the normalized current signal energies at the remaining monitoring positions are greater than 0, it is determined that the overvoltage mode of the substation equipment is GIS switching operation.

5. The method according to claim 1, characterized in that, The comparison data includes: partial discharge phase width, ratio of positive and negative half-cycle discharge times, ratio of average discharge amplitudes of positive and negative half-cycles, discharge amplitude entropy value, and maximum discharge amplitude entropy value.

6. The method according to claim 1, wherein Extracting partial discharge characteristics of each monitoring position according to the overvoltage mode, including: When the overvoltage mode is experiencing a line overvoltage, extracting the current signals collected by the arrester grounding lead sensor and the transformer bushing end shield sensor as the partial discharge characteristics; When the overvoltage mode is GIS switching operation, extracting the current signals collected by the GIS jumper and the transformer core grounding lead sensor as the partial discharge characteristics.

7. A partial discharge analysis device for a power transformation equipment, characterized in that, Including: A collection module for collecting current signals at multiple preset monitoring positions of substation equipment; A calculation module for calculating the normalized current signal energy of the current signals at each monitoring position respectively; An analysis module for performing overvoltage mode analysis based on the normalized current signal energy to determine the overvoltage mode of the substation equipment; An extraction module for extracting partial discharge characteristics of each monitoring position according to the overvoltage mode; A determination module for performing analysis based on the partial discharge characteristics and pre-stored comparison data to determine the partial discharge type of the substation equipment.

8. The device according to claim 7, characterized in that The monitoring positions include: GIS jumper, arrester grounding lead, transformer bushing end shield, and transformer core grounding lead.

9. A computer-readable storage medium, characterized in that, The storage medium stores a computer program, and the computer program is used to execute the method according to any one of claims 1-6 above.

10. An electronic device, characterized in that, The electronic device includes: A processor; A memory for storing instructions executable by the processor; The processor is configured to read the executable instructions from the memory and execute the instructions to implement the method according to any one of claims 1-6 above.

Images