Transformer bushing internal temperature monitoring method, device, equipment and storage medium

Abstract

Embodiments of the present invention disclose a method, apparatus, device, and storage medium for monitoring the internal temperature of a transformer bushing. The method includes: building a simulation model of the transformer bushing based on target parameters of the transformer bushing; correcting the simulation model based on a first shed temperature outside the transformer bushing operating under a first load current condition and a second shed temperature outside the simulation model to obtain a target corrected model; obtaining the internal temperature of the transformer bushing operating under the load current condition to be measured based on a third shed temperature outside the transformer bushing operating under the load current condition to be measured and the target simulation model; and monitoring the internal temperature of the transformer bushing using the above method, effectively improving the monitoring effect of the internal temperature of the transformer bushing, thereby achieving the purpose of promptly detecting transformer bushing faults.

Description

Technical Field

[0001] The present invention relates to the technical field of transformer bushing temperature measurement, and in particular to a method and device, equipment and storage medium for monitoring the internal temperature of a transformer bushing. Background Art

[0002] The transformer bushing is the primary insulation device outside the transformer box. It connects the transformer's internal leads to the external circuits, and serves as a protective and circuit-connecting device. A transformer bushing failure can cause the transformer to stop working, so ensuring stable operation of the transformer bushing is crucial. Therefore, timely detection of transformer bushing failures is crucial.

[0003] At present, one of the main methods to determine whether a transformer bushing has a fault is to detect the internal temperature of the transformer bushing. However, due to the airtightness of the transformer bushing itself and the inconvenience of disassembly after the bushing is installed and put into operation, the monitoring of the internal temperature of the transformer bushing has limitations. Therefore, the existing technology is not effective in measuring the internal temperature of the transformer bushing. It can only detect when the transformer bushing has a serious fault, and there is a problem that early faults of the transformer bushing cannot be discovered in time. Summary of the Invention

[0004] Based on this, it is necessary to propose a method and device, equipment and storage medium for monitoring the internal temperature of the transformer bushing to solve the problem of not being able to detect early faults of the transformer bushing in time.

[0005] To achieve the above objectives, the present application provides, in a first aspect, a method for monitoring the internal temperature of a transformer bushing, the method comprising:

[0006] Obtain target parameters of transformer bushing;

[0007] Building a simulation model of the transformer bushing according to the target parameters, wherein the simulation model is used to simulate the correlation between the shed temperature outside the transformer bushing and the internal temperature of the transformer bushing;

[0008] Acquire a first shed temperature outside the transformer bushing in operation under a first load current condition, and a second shed temperature outside the simulation model under the first load current condition;

[0009] Correcting the simulation model according to the first shed temperature, the second shed temperature, and the target parameter to obtain a corrected target simulation model;

[0010] The internal temperature of the transformer bushing in operation under the load current condition to be measured is obtained according to the third shed temperature outside the transformer bushing in operation under the load current condition to be measured and the target simulation model.

[0011] Furthermore, the target parameters include at least: current-carrying circuit parameters, transformer oil parameters, capacitor core parameters and porcelain bushing parameters;

[0012] The current-carrying loop parameters include at least: the material, size, and loop resistance of the conductive rod in the transformer bushing, and the contact form, roughness, microhardness, contact pressure, and contact resistance of the electrical connection of the transformer bushing;

[0013] The transformer oil parameters include at least: a first thermal conductivity parameter of the transformer oil;

[0014] The capacitor core parameters include at least: a second thermal conductivity parameter of the capacitor core;

[0015] The porcelain bushing parameters at least include: a third thermal conductivity parameter of the porcelain bushing.

[0016] Furthermore, the simulation model is corrected according to the first shed temperature, the second shed temperature and the target parameter to obtain a corrected target simulation model, which also includes:

[0017] Obtaining a first loop resistance of the current-carrying loop when the transformer bushing is not installed and a second loop resistance of the current-carrying loop after the transformer bushing is installed;

[0018] Obtaining an installation error of the transformer bushing according to a difference between the first loop resistance and the second loop resistance;

[0019] The simulation model is corrected according to the installation error.

[0020] Furthermore, the modifying the simulation model according to the first shed temperature, the second shed temperature and the target parameter to obtain a modified target simulation model specifically includes:

[0021] Calculating a correction coefficient according to the first shed temperature and the second shed temperature to obtain a first temperature correction coefficient;

[0022] Calculating a correction coefficient according to the first thermal conductivity parameter, the second thermal conductivity parameter, the third thermal conductivity parameter, and the first temperature correction coefficient to obtain a first weighted temperature correction coefficient;

[0023] The simulation model is corrected according to the first weighted temperature correction coefficient to obtain the target simulation model.

[0024] Furthermore, the simulation model is corrected according to the first weighted temperature correction coefficient to obtain the target simulation model, and then the method further includes:

[0025] Obtaining a fourth shed temperature outside the transformer bushing and a third loop resistance of the current-carrying loop during operation under a second load current condition different from the first load current;

[0026] calibrating the target simulation model according to the fourth shed temperature and the third loop resistance;

[0027] If the verification fails, obtaining a fifth shed temperature outside the transformer bushing in operation under a third load current condition, and a sixth shed temperature outside the simulation model under the third load current condition;

[0028] Calculating a correction coefficient according to the fifth shed temperature and the sixth shed temperature to obtain a second temperature correction coefficient under the third load current working condition;

[0029] calculating a correction coefficient according to the first thermal conductivity parameter, the second thermal conductivity parameter, the third thermal conductivity parameter, and the second temperature correction coefficient to obtain a second weighted temperature correction coefficient under a third load current condition;

[0030] Taking an average of the first weighted temperature correction coefficient and the second weighted temperature correction coefficient, and using the average as a third weighted temperature correction coefficient;

[0031] The target simulation model is corrected again according to the third weighted temperature correction coefficient.

[0032] Further, obtaining the internal temperature of the transformer bushing when operating under the load current condition to be measured based on the third shed temperature outside the transformer bushing when operating under the load current condition to be measured and the target simulation model specifically includes:

[0033] Acquiring a third shed temperature outside the transformer bushing during operation under the load current condition to be measured;

[0034] The shed temperature outside the target simulation model is set as the third shed temperature, and the internal temperature of the target simulation model is obtained as the internal temperature of the transformer bushing when the transformer bushing is operating under the load current condition to be measured.

[0035] Furthermore, the first shed temperature, the second shed temperature and the third shed temperature are obtained by using infrared temperature measurement technology.

[0036] To achieve the above-mentioned object, the second aspect of the present application provides a device for monitoring the internal temperature of a transformer bushing, the device comprising: a simulation model building module, a simulation model correction module and a temperature monitoring module;

[0037] The simulation model building module is used to obtain target parameters of the transformer bushing;

[0038] Building a simulation model of the transformer bushing according to the target parameters, wherein the simulation model is used to simulate the correlation between the shed temperature outside the transformer bushing and the internal temperature of the transformer bushing;

[0039] The simulation model correction module is used to obtain a first shed temperature outside the transformer bushing in operation under a first load current condition, and a second shed temperature outside the simulation model under the first load current condition;

[0040] Correcting the simulation model according to the first shed temperature, the second shed temperature, and the target parameter to obtain a corrected target simulation model;

[0041] The temperature monitoring module is used to obtain the internal temperature of the transformer bushing when operating under the load current condition to be measured based on the third shed temperature outside the transformer bushing when operating under the load current condition to be measured and the target simulation model.

[0042] To achieve the above-mentioned purpose, the third aspect of the present application provides a computer-readable storage medium storing a computer program, characterized in that when the computer program is executed by a processor, the processor executes the steps of the method described in the first aspect.

[0043] To achieve the above-mentioned objectives, the fourth aspect of the present application provides a computer device, comprising a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor executes the steps of the method described in the first aspect.

[0044] The embodiments of the present invention have the following beneficial effects:

[0045] The present invention builds a simulation model of the transformer bushing according to target parameters of the transformer bushing, corrects the simulation model according to a first shed temperature of the outside of the transformer bushing operating under a first load current condition, and a second shed temperature of the outside of the simulation model under the first load current condition, to obtain a target correction model, obtains the internal temperature of the transformer bushing operating under the load current condition to be measured according to a third shed temperature of the outside of the transformer bushing operating under the load current condition to be measured and the target simulation model, uses the shed temperature of the outside of the transformer bushing and the target simulation model, and uses the obtained temperature of the simulation model under the load current condition to be measured as the internal temperature of the transformer bushing, so as to monitor the internal temperature of the transformer bushing, thereby effectively improving the monitoring effect of the internal temperature of the transformer bushing, so as to achieve the purpose of timely detecting transformer bushing faults. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0047] in:

[0048] Figure 1 1 is a flow chart of a method for monitoring the internal temperature of a transformer bushing according to an embodiment of the present invention;

[0049] Figure 2 In the embodiment of the present invention Figure 1 A schematic flow chart of detailed steps of step 400 of the illustrated embodiment;

[0050] Figure 3 Schematic diagram of a flow chart of a method for re-correcting a target simulation model in an embodiment of the present invention;

[0051] Figure 4 A schematic diagram of a process for correcting a simulation model using installation errors in an embodiment of the present invention;

[0052] Figure 5 This is a schematic structural diagram of a transformer bushing internal temperature monitoring device according to an embodiment of the present application;

[0053] Figure 6 This is a diagram of the internal structure of a computer device in an embodiment of the present application. DETAILED DESCRIPTION

[0054] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0055] In the embodiment of the present application, a method for monitoring the internal temperature of a transformer bushing is provided. Figure 1 , Figure 1 1 is a flow chart of a method for monitoring the internal temperature of a transformer bushing according to an embodiment of the present invention, which specifically includes:

[0056] Step 100, obtaining target parameters of the transformer bushing;

[0057] Since the transformer bushing is mainly composed of a capacitor core, an oil pillow, a flange, and upper and lower porcelain bushings, the main insulation is a capacitor core, which is composed of concentric capacitors in series and is enclosed in a sealed container composed of upper and lower porcelain bushings, an oil pillow, a flange and a base. The container is filled with treated transformer oil, making the internal main insulation an oil-paper structure. The flange is equipped with a vent plug, an oil extraction device, and a device for measuring the bushing dielectric loss and partial discharge. There are two sections of conductive rods in the transformer bushing, and there is an electrical connection structure between the two sections of conductive rods.

[0058] The target parameters of the transformer bushing include at least current-carrying circuit parameters, transformer oil parameters, capacitor core parameters and porcelain bushing parameters.

[0059] Specifically, the current-carrying loop parameters include at least the material, size, loop resistance, etc. of the conductive rod in the transformer bushing, as well as the contact form, roughness, microhardness, contact pressure and contact resistance, etc. of the electrical connection of the electrical connection structure of the transformer bushing; the transformer oil data includes at least the first thermal conductivity parameter, and may also include the components of the transformer oil; the capacitor core parameters include at least the second thermal conductivity parameter of the capacitor core, and may also include: the material, size, etc. of the capacitor core; the porcelain bushing data parameters include at least the third thermal conductivity parameter of the porcelain bushing, and may also include the material, size, etc. of the porcelain bushing.

[0060] The above target parameters are obtained to simulate the transformer bushing to obtain a simulation model. In addition, the thermal conductivity parameters of each component structure of the transformer bushing are obtained to make the obtained simulation model closer to the actual transformer bushing.

[0061] It is understandable that the transformer bushing structure is relatively complex, and the target parameters may also include more parameters and are not limited to the target parameters proposed in this embodiment. Anyone skilled in the art who increases or decreases the target parameters without paying any creativity falls within the scope of protection of the present invention. When more target parameters are obtained, the obtained simulation model will be more accurate.

[0062] Step 200: Building a simulation model of the transformer bushing according to the target parameters, the simulation model is used to simulate the correlation between the shed temperature outside the transformer bushing and the internal temperature of the transformer bushing;

[0063] Specifically, a simulation model of the transformer bushing is built in the simulation software according to the target parameters of the transformer bushing.

[0064] Furthermore, a detailed electrothermal coupling field simulation model of the transformer bushing can be constructed in simulation software (e.g., Comsol) based on the target parameters of the transformer bushing. This model simulates the transformer bushing, simulating the relationship between the shed temperature outside the transformer bushing and the internal temperature of the transformer bushing. It is understood that the aforementioned current-carrying circuit parameters can simulate the conductive rods and electrical connection structure within the transformer bushing, while the transformer oil parameters, capacitor core parameters, and porcelain bushing data parameters can simulate the various components of the transformer bushing, making the simulation model more similar to the actual transformer bushing.

[0065] Step 300, obtaining a first shed temperature outside a transformer bushing in operation under a first load current condition, and a second shed temperature outside a simulation model under the first load current condition;

[0066] Specifically, the first shed temperature may be measured using infrared temperature measurement technology.

[0067] Step 400, correcting the simulation model according to the first shed temperature, the second shed temperature and the target parameters to obtain a corrected target simulation model;

[0068] For a better understanding of step 400, please refer to 2, Figure 2 In the embodiment of the present invention Figure 1 The flowchart of the detailed steps of step 400 of the embodiment shown specifically includes:

[0069] Step 410, calculating a correction coefficient based on the first shed temperature and the second shed temperature to obtain a first temperature correction coefficient;

[0070] Specifically, it can be obtained using the following formula:

[0071] T1=K1×T2

[0072] Wherein, T1 is the first shed temperature, T2 is the second shed temperature, and K1 is the first temperature correction coefficient.

[0073] Step 420, calculating a correction coefficient based on the first thermal conductivity parameter, the second thermal conductivity parameter, the third thermal conductivity parameter, and the first temperature correction coefficient to obtain a first weighted temperature correction coefficient;

[0074] Specifically, it can be obtained using the following formula:

[0075]

[0076] Among them, K si1 is the first weighted temperature correction coefficient, K1 is the first temperature correction coefficient, λ i is the i-th thermal conductivity parameter of the transformer bushing, where the value of i is one, two, or three, and the value of n is three.

[0077] Step 430 , correcting the simulation model according to the first weighted temperature correction coefficient to obtain a target simulation model.

[0078] Specifically, the simulation model is corrected using the first weighted temperature correction coefficient to achieve a target simulation model that is closer to the actual transformer bushing, thereby improving the accuracy of obtaining the internal temperature of the transformer bushing using the target simulation model.

[0079] After step 430, the target simulation model is further modified. Figure 3 , Figure 3 This is a schematic diagram of a process for re-correcting a target simulation model according to an embodiment of the present invention, specifically including:

[0080] Step 431, obtaining a fourth shed temperature outside the bushing of the transformer operating under a second load current condition different from the first load current and a third loop resistance of the current-carrying loop;

[0081] Specifically, the temperature of the fourth shed can be measured using infrared temperature measurement technology.

[0082] Step 432: Verify the target simulation model based on the fourth shed temperature and the third loop resistance;

[0083] Specifically, the fourth shed temperature and the third loop resistance are substituted into the target simulation model for verification.

[0084] If the verification passes, proceed directly to step 500.

[0085] Step 433: If the verification fails, obtaining a fifth shed temperature outside the operating transformer bushing under the third load current condition and a sixth shed temperature outside the simulation model under the third load current condition;

[0086] Specifically, the temperature of the fifth shed can be measured using infrared temperature measurement technology.

[0087] Step 434, calculating a correction coefficient based on the fifth shed temperature and the sixth shed temperature to obtain a second temperature correction coefficient under a third load current condition;

[0088] Specifically, it can be obtained using the following formula:

[0089] T5=K2×T6

[0090] Wherein, T5 is the fifth shed temperature, T6 is the sixth shed temperature, and K2 is the second temperature correction coefficient.

[0091] Step 435 , calculating a correction coefficient based on the first thermal conductivity parameter, the second thermal conductivity parameter, the third thermal conductivity parameter, and the second temperature correction coefficient to obtain a second weighted temperature correction coefficient under a third load current condition;

[0092] Specifically, it can be obtained using the following formula:

[0093]

[0094] Among them, K si2 is the second weighted temperature correction coefficient, K2 is the second temperature correction coefficient, λ i is the thermal conductivity parameter of the transformer bushing.

[0095] Step 436 , taking the average of the first weighted temperature correction coefficient and the second weighted temperature correction coefficient, and using the average as the third weighted temperature correction coefficient;

[0096] Specifically, we can take K si1 and K si2 The average value is used as the third weighted temperature correction coefficient K si3 .

[0097] Step 437: Correct the target simulation model again according to the third weighted temperature correction coefficient.

[0098] Specifically, the third weighted temperature correction coefficient K is used si3 The target simulation model is revised again to achieve more accurate simulation results of the final simulation model.

[0099] For steps 433 to 437, the shed temperature outside the transformer bushing and the shed temperature outside the simulation model can be measured multiple times under different load current conditions, and correction coefficients can be calculated multiple times based on the multiple measurement results and the thermal conductivity parameters of the transformer bushing to obtain multiple weighted temperature coefficients. The average value of the multiple weighted temperature coefficients is taken to correct the target simulation model again, so as to achieve a more accurate simulation result of the simulation model finally obtained.

[0100] Before step 400, the simulation model is corrected using the installation error. Figure 4 , Figure 4 This is a schematic diagram of a simulation model correction process using installation errors in an embodiment of the present invention, specifically including:

[0101] Step 401, obtaining a first loop resistance of a current-carrying loop when the transformer bushing is not installed and a second loop resistance of the current-carrying loop after the transformer bushing is installed;

[0102] Specifically, the first loop resistance of the current-carrying circuit when the transformer bushing is not installed is the loop resistance of the electrical connection of the transformer bushing current-carrying circuit when the transformer bushing is not installed. When obtaining the first loop resistance of the current-carrying circuit when the transformer bushing is not installed, a four-wire method can be used to perform multiple measurements to obtain multiple measurement values. The measurement values ​​are compared, and measurement values ​​with large errors are removed. The average of the measurement values ​​after error removal is taken as the first loop resistance of the current-carrying circuit when the transformer bushing is not installed.

[0103] Specifically, the second loop resistance of the current-carrying loop after the transformer bushing is installed is the loop resistance of the current-carrying loop of the transformer bushing after the transformer bushing is installed but not put into operation.

[0104] Step 402, obtaining an installation error of the transformer bushing according to a difference between the first loop resistance and the second loop resistance;

[0105] Specifically, the installation error of the transformer bushing is the error in the loop resistance of the current-carrying loop of the transformer bushing before and after the installation of the transformer bushing. That is, the difference between the first loop resistance and the second loop resistance in the embodiment of the present application can be used as the installation error. The installation error can be expressed as:

[0106] ΔR 21 =R2-R1

[0107] Wherein, R1 is the first loop resistance, and R2 is the second loop resistance.

[0108] Step 403: Correct the simulation model according to the installation error.

[0109] Specifically, the installation error of the transformer bushing is added to the simulation model to correct the simulation model.

[0110] Step 500 : obtaining the internal temperature of the transformer bushing in operation under the load current condition to be measured according to the third shed temperature outside the transformer bushing in operation under the load current condition to be measured and the target simulation model.

[0111] Specifically, the third shed temperature outside the transformer bushing in operation under the load current condition to be measured is obtained;

[0112] The shed temperature outside the target simulation model is set to the third shed temperature, and the internal temperature of the target simulation model is obtained as the internal temperature of the transformer bushing when the transformer bushing is operating under the load current condition to be measured. When the internal temperature of the transformer bushing is higher than the preset range, it is determined that the transformer bushing is in an abnormal state. In this way, the temperature inside the transformer bushing is monitored and it is determined whether the transformer bushing has a fault.

[0113] In an embodiment of the present invention, a simulation model of a transformer bushing is built according to target parameters of the transformer bushing, and the simulation model is corrected according to a first shed temperature of the outside of the transformer bushing operating under a first load current condition and a second shed temperature of the outside of the simulation model under the first load current condition to obtain a target correction model. The internal temperature of the transformer bushing operating under the load current condition to be measured is obtained according to a third shed temperature of the outside of the transformer bushing operating under the load current condition to be measured and the target simulation model. The obtained internal temperature of the transformer bushing is used to determine whether the transformer bushing is in a normal state, thereby monitoring the internal temperature of the transformer bushing. Therefore, the above method effectively improves the monitoring effect of the internal temperature of the transformer bushing, so as to achieve the purpose of timely detecting transformer bushing faults.

[0114] In another embodiment of the present invention, a training calculation can be performed based on the target simulation model to obtain an expression representing the correlation between the external shed temperature of the transformer bushing and the internal temperature of the transformer bushing. By substituting the external shed temperature of the transformer bushing operating under the load current condition to be measured into the expression with the correlation relationship, the internal temperature of the transformer bushing is obtained. Using the above method, the internal temperature of the transformer bushing can be obtained more quickly, thereby improving monitoring efficiency.

[0115] In the embodiment of the present application, a device for monitoring the internal temperature of a transformer bushing is provided. Figure 5 , Figure 5 Schematic diagram of the structure of the transformer bushing internal temperature monitoring device in an embodiment of the present application, the device includes: a simulation model building module 601, a simulation model correction module 602 and a temperature monitoring module 603;

[0116] A simulation model building module 601 is used to obtain target parameters of the transformer bushing;

[0117] A simulation model of the transformer bushing is built based on the target parameters. The simulation model is used to simulate the correlation between the shed temperature outside the transformer bushing and the internal temperature of the transformer bushing.

[0118] The simulation model correction module 602 is configured to obtain a first shed temperature outside the operating transformer bushing under a first load current condition, and a second shed temperature outside the simulation model under the first load current condition;

[0119] The simulation model is modified according to the first shed temperature, the second shed temperature and the target parameter to obtain a modified target simulation model;

[0120] The temperature monitoring module 603 is used to obtain the internal temperature of the transformer bushing under the load current condition to be measured based on the third shed temperature outside the transformer bushing under the load current condition to be measured and the target simulation model.

[0121] Through the transformer bushing internal temperature monitoring device, the target parameters of the transformer bushing are obtained to build a simulation model of the transformer bushing. The simulation model is corrected according to the first shed temperature of the outside of the transformer bushing operating under the first load current condition and the second shed temperature of the outside of the simulation model under the first load current condition to obtain a target correction model. The internal temperature of the transformer bushing operating under the load current condition to be measured is obtained according to the third shed temperature of the outside of the transformer bushing operating under the load current condition to be measured and the target simulation model. The obtained internal temperature of the transformer bushing is used to determine whether the transformer bushing is in a normal state, thereby monitoring the internal temperature of the transformer bushing. Therefore, the above device effectively improves the monitoring effect of the internal temperature of the transformer bushing, so as to achieve the purpose of timely detection of transformer bushing faults.

[0122] Figure 6 FIG1 shows the internal structure of a computer device in one embodiment of the present invention. The computer device can be a terminal or a system. Figure 6 As shown, the computer device includes a processor, a memory, and a network interface connected via a system bus. The memory includes a non-volatile storage medium and an internal memory. The non-volatile storage medium of the computer device stores an operating system and may also store a computer program. When the computer program is executed by the processor, the processor can implement the various steps in the above method embodiment. The internal memory may also store a computer program. When the computer program is executed by the processor, the processor can implement the various steps in the above method embodiment. It will be understood by those skilled in the art that Figure 6 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than shown in the figure, or combine certain components, or have a different component arrangement.

[0123] In one embodiment, a computer device is provided, including a memory and a processor. The memory stores a computer program. When the computer program is executed by the processor, the processor executes each step in the above method embodiment.

[0124] In one embodiment, a computer-readable storage medium is provided, which stores a computer program. When the computer program is executed by a processor, the processor executes the steps in the above method embodiment.

[0125] Those skilled in the art will appreciate that all or part of the processes in the above-mentioned embodiments can be implemented by instructing the relevant hardware through a computer program. The program can be stored in a non-volatile computer-readable storage medium. When the program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0126] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0127] The above embodiments merely illustrate several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art could make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A method for monitoring the internal temperature of a transformer bushing, characterized in that: The method comprises: Obtain target parameters of transformer bushing; Building a simulation model of the transformer bushing according to the target parameters, wherein the simulation model is used to simulate the correlation between the shed temperature outside the transformer bushing and the internal temperature of the transformer bushing; Acquire a first shed temperature outside the transformer bushing in operation under a first load current condition, and a second shed temperature outside the simulation model under the first load current condition; Correcting the simulation model according to the first shed temperature, the second shed temperature, and the target parameter to obtain a corrected target simulation model; Obtaining an internal temperature of the transformer bushing when operating under the load current condition to be measured based on a third shed temperature outside the transformer bushing when operating under the load current condition to be measured and the target simulation model; The target parameters include at least transformer oil parameters, capacitor core parameters and porcelain bushing parameters, wherein the transformer oil parameters include at least a first thermal conductivity parameter of the transformer oil; the capacitor core parameters include at least a second thermal conductivity parameter of the capacitor core; and the porcelain bushing parameters include at least a third thermal conductivity parameter of the porcelain bushing. The step of correcting the simulation model according to the first shed temperature, the second shed temperature, and the target parameter to obtain a corrected target simulation model specifically includes: Calculating a correction coefficient according to the first shed temperature and the second shed temperature to obtain a first temperature correction coefficient; Calculating a correction coefficient according to the first thermal conductivity parameter, the second thermal conductivity parameter, the third thermal conductivity parameter, and the first temperature correction coefficient to obtain a first weighted temperature correction coefficient; Correcting the simulation model according to the first weighted temperature correction coefficient to obtain the target simulation model; The first temperature correction coefficient is obtained using the following formula: T1=K1×T2 Where, T1 is the first shed temperature, T2 is the second shed temperature, and K1 is the first temperature correction coefficient; The first weighted temperature correction coefficient is obtained using the following formula: Where K si1 is the first weighted temperature correction coefficient, K1 is the first temperature correction coefficient, λ i is the i-th thermal conductivity parameter of the transformer bushing, where the value of i is one, two, or three, and the value of n is three.

2. The method according to claim 1, characterized in that The target parameters include at least: current-carrying loop parameters; The current-carrying loop parameters include at least the material, size, and loop resistance of the conductive rod in the transformer bushing, and the contact form, roughness, microhardness, contact pressure, and contact resistance of the electrical connection of the transformer bushing.

3. The method according to claim 1, characterized in that The step of correcting the simulation model according to the first shed temperature, the second shed temperature and the target parameter to obtain a corrected target simulation model further includes: Obtaining a first loop resistance of the current-carrying loop when the transformer bushing is not installed and a second loop resistance of the current-carrying loop after the transformer bushing is installed; Obtaining an installation error of the transformer bushing according to a difference between the first loop resistance and the second loop resistance; The simulation model is corrected according to the installation error.

4. The method according to claim 1, wherein The simulation model is corrected according to the first weighted temperature correction coefficient to obtain the target simulation model, and then the method further includes: Obtaining a fourth shed temperature outside the transformer bushing and a third loop resistance of the current-carrying loop during operation under a second load current condition different from the first load current; calibrating the target simulation model according to the fourth shed temperature and the third loop resistance; If the verification fails, obtaining a fifth shed temperature outside the transformer bushing in operation under a third load current condition, and a sixth shed temperature outside the simulation model under the third load current condition; Calculating a correction coefficient according to the fifth shed temperature and the sixth shed temperature to obtain a second temperature correction coefficient under the third load current working condition; calculating a correction coefficient according to the first thermal conductivity parameter, the second thermal conductivity parameter, the third thermal conductivity parameter, and the second temperature correction coefficient to obtain a second weighted temperature correction coefficient under a third load current condition; Taking an average of the first weighted temperature correction coefficient and the second weighted temperature correction coefficient, and using the average as a third weighted temperature correction coefficient; Correcting the target simulation model again according to the third weighted temperature correction coefficient; The second temperature correction coefficient is obtained using the following formula: T5=K2×T6 Where T5 is the fifth shed temperature, T6 is the sixth shed temperature, K2 is the second temperature correction coefficient, The second weighted temperature correction coefficient is obtained using the following formula: Where K si2 is the second weighted temperature correction coefficient, K2 is the second temperature correction coefficient, λ i is the thermal conductivity parameter of the transformer bushing.

5. The method according to claim 1, wherein Obtaining the internal temperature of the transformer bushing when operating under the load current condition to be measured based on the third shed temperature outside the transformer bushing when operating under the load current condition to be measured and the target simulation model specifically includes: Acquiring a third shed temperature outside the transformer bushing during operation under the load current condition to be measured; The shed temperature outside the target simulation model is set as the third shed temperature, and the internal temperature of the target simulation model is obtained as the internal temperature of the transformer bushing when the transformer bushing is operating under the load current condition to be measured.

6. The method according to claim 1, characterized in that The first shed temperature, the second shed temperature and the third shed temperature are obtained by using infrared temperature measurement technology.

7. A transformer bushing internal temperature monitoring device, characterized in that: The device comprises: a simulation model building module, a simulation model correction module and a temperature monitoring module; The simulation model building module is used to obtain target parameters of the transformer bushing; Building a simulation model of the transformer bushing according to the target parameters, wherein the simulation model is used to simulate the correlation between the shed temperature outside the transformer bushing and the internal temperature of the transformer bushing; The simulation model correction module is used to obtain a first shed temperature outside the transformer bushing in operation under a first load current condition, and a second shed temperature outside the simulation model under the first load current condition; Correcting the simulation model according to the first shed temperature, the second shed temperature, and the target parameter to obtain a corrected target simulation model; The temperature monitoring module is configured to obtain the internal temperature of the transformer bushing when the transformer bushing is operating under the load current condition to be measured based on the third shed temperature outside the transformer bushing when the transformer bushing is operating under the load current condition to be measured and the target simulation model; The target parameters include at least transformer oil parameters, capacitor core parameters and porcelain bushing parameters, wherein the transformer oil parameters include at least a first thermal conductivity parameter of the transformer oil; the capacitor core parameters include at least a second thermal conductivity parameter of the capacitor core; and the porcelain bushing parameters include at least a third thermal conductivity parameter of the porcelain bushing. The simulation model correction module is further configured to calculate a correction coefficient according to the first shed temperature and the second shed temperature to obtain a first temperature correction coefficient; Calculating a correction coefficient according to the first thermal conductivity parameter, the second thermal conductivity parameter, the third thermal conductivity parameter, and the first temperature correction coefficient to obtain a first weighted temperature correction coefficient; Correcting the simulation model according to the first weighted temperature correction coefficient to obtain the target simulation model; The first temperature correction coefficient is obtained using the following formula: T1=K1×T2 Where, T1 is the first shed temperature, T2 is the second shed temperature, and K1 is the first temperature correction coefficient; The first weighted temperature correction coefficient is obtained using the following formula: Where K si1 is the first weighted temperature correction coefficient, K1 is the first temperature correction coefficient, λ i is the i-th thermal conductivity parameter of the transformer bushing, where the value of i is one, two, or three, and the value of n is three.

8. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the processor is caused to perform the steps of the method according to any one of claims 1 to 6.

9. A computer device comprising a memory and a processor, characterized in that: The memory stores a computer program, and when the computer program is executed by the processor, the processor is caused to perform the steps of the method according to any one of claims 1 to 6.

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