Method and device for monitoring mechanical state of transformer winding

Abstract

The present invention discloses a method and device for monitoring the mechanical condition of transformer windings. The method comprises: obtaining the load harmonic distortion rate and voltage harmonic distortion rate of a target transformer; comparing the load harmonic distortion rate and voltage harmonic distortion rate with a first predetermined threshold value to obtain a first comparison result; based on the first comparison result, collecting a vibration signal of the target transformer; and determining a mechanical condition monitoring result of the windings in the target transformer based on the vibration signal. This invention solves the technical problem of the difficulty in accurately determining the mechanical condition of a running transformer winding based on vibration signals.

Description

Technical Field

[0001] The present invention relates to the field of transformer mechanical state monitoring, and in particular to a method and device for monitoring the mechanical state of a transformer winding. Background Art

[0002] In related technologies, the vibration signal of the transformer's oil tank wall can be used to determine the mechanical vibration state of the transformer's windings. However, for a running transformer, its vibration signal is generated by the coupled vibration of the iron core and windings. Therefore, it is impossible to determine whether the abnormal vibration signal is caused by an abnormal iron core or an abnormal winding. In addition, the vibration signal generated by a running transformer is also easily affected by voltage harmonic distortion, load harmonic distortion, etc., which may cause misjudgment of the mechanical vibration state.

[0003] Therefore, in the related art, there is a technical problem that it is difficult to accurately determine the mechanical state of the winding of the operating transformer based on the vibration signal.

[0004] To address the above-mentioned problems, no effective solutions have been proposed so far. Summary of the Invention

[0005] Embodiments of the present invention provide a method and device for monitoring the mechanical state of a transformer winding, so as to at least solve the technical problem that it is difficult to accurately determine the mechanical state of a winding of a running transformer based on a vibration signal.

[0006] According to one aspect of an embodiment of the present invention, a method for monitoring the mechanical state of a transformer winding is provided, including: obtaining a load harmonic distortion rate and a voltage harmonic distortion rate of a target transformer; comparing the load harmonic distortion rate and the voltage harmonic distortion rate with a first predetermined threshold value, respectively, to obtain a first comparison result; based on the first comparison result, collecting a vibration signal of the target transformer; and determining a mechanical state monitoring result of the winding in the target transformer based on the vibration signal.

[0007] Optionally, based on the first comparison result, the vibration signal of the target transformer is collected, including: when the first comparison result is that the load harmonic distortion rate is less than the first predetermined threshold and the voltage harmonic distortion is less than the first predetermined threshold, obtaining the load rate of the target transformer; comparing the load rate of the target transformer with the second predetermined threshold to obtain a second comparison result; based on the second comparison result, collecting the vibration signal.

[0008] Optionally, based on the second comparison result, a vibration signal is collected, including: when the second comparison result is that the load rate of the target transformer is less than a second predetermined threshold, determining a load transfer strategy between the target transformer and the load transfer transformer; based on the load transfer strategy, transferring the load of the load transfer transformer to the target transformer until the load rate of the target transformer is greater than or equal to the second predetermined threshold, and collecting a vibration signal.

[0009] Optionally, before determining the transfer strategy between the target transformer and the load transfer transformer, it also includes: determining a candidate transformer connected in parallel with the target transformer; obtaining the load rate of the candidate transformer; and determining the load transfer transformer based on the load rate of the candidate transformer.

[0010] Optionally, the above method further includes: monitoring the oil temperature of the target transformer during the collection of the vibration signal; and transferring the load transferred to the target transformer back to the load transfer transformer when the oil temperature is greater than an alarm value.

[0011] Optionally, the above method further includes: after the vibration signal acquisition is completed, transferring the load transferred to the target transformer back to the load transfer transformer.

[0012] Optionally, based on the vibration signal, the mechanical state monitoring result of the winding in the target transformer is determined, including: extracting the high-frequency vibration component in the vibration signal; when the high-frequency vibration component is greater than the warning value, determining that the mechanical state monitoring result of the winding in the target transformer is an abnormal mechanical state of the winding.

[0013] According to another aspect of an embodiment of the present invention, a device for monitoring the mechanical state of a transformer winding is also provided, including: an acquisition module for acquiring the load harmonic distortion rate and the voltage harmonic distortion rate of a target transformer; a comparison module for comparing the load harmonic distortion rate and the voltage harmonic distortion rate with a first predetermined threshold value, respectively, to obtain a first comparison result; an acquisition module for acquiring a vibration signal of the target transformer based on the first comparison result; and a determination module for determining a mechanical state monitoring result of the winding in the target transformer based on the vibration signal.

[0014] According to another aspect of an embodiment of the present invention, a computer-readable storage medium is also provided, which includes a stored program, wherein when the program is running, the device where the computer-readable storage medium is located is controlled to execute any of the above-mentioned methods for monitoring the mechanical state of the transformer winding.

[0015] According to another aspect of an embodiment of the present invention, a computer device is provided, comprising: a memory and a processor, wherein the memory stores a computer program; and the processor is configured to execute the computer program stored in the memory, wherein when the computer program is executed, the processor executes any one of the above-mentioned methods for monitoring the mechanical state of a transformer winding.

[0016] In an embodiment of the present invention, the load harmonic distortion rate, voltage harmonic distortion rate, and load rate of a target transformer are monitored in real time. When both the load harmonic distortion rate and the voltage harmonic distortion rate are less than a first predetermined threshold, i.e., the vibration signal at this time will not cause misjudgment of the mechanical state due to excessive load harmonic distortion rate and voltage harmonic distortion rate, the load rate of the target transformer is then compared with a second predetermined threshold. When the load rate of the target transformer is greater than the second predetermined threshold, it indicates that the vibration signal at this time will not be unable to accurately judge the mechanical state of the winding due to excessively low load of the target transformer, and the vibration signal can be directly collected. If the load rate of the target transformer is greater than or equal to the second predetermined threshold, the embodiment of the present invention increases the load rate of the target transformer by means of a load transfer transformer. After the load rate of the target transformer reaches the second predetermined threshold, the vibration signal is collected again. This achieves the purpose of enabling the vibration signal to accurately represent the mechanical state of the target transformer winding, thereby achieving the technical effect of improving the accuracy and reliability of judging the mechanical state of the transformer winding based on the vibration signal, and further solving the technical problem of difficulty in accurately judging the mechanical state of the winding of a running transformer based on the vibration signal. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0018] Figure 1 is a flow chart of a method for monitoring the mechanical state of a transformer winding according to an embodiment of the present invention;

[0019] Figure 2 This is a flow chart of a method for intelligently controlling the load rate of an in-service transformer and comprehensively monitoring the mechanical state of the windings, provided according to an optional embodiment of the present invention;

[0020] Figure 3 4 is a structural block diagram of a device for monitoring the mechanical state of a transformer winding provided according to an embodiment of the present invention. DETAILED DESCRIPTION

[0021] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0022] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0023] Monitoring the vibration signal from the transformer tank wall can effectively identify mechanical vibration conditions such as transformer winding deformation. However, for operating transformers, the tank wall vibration signal is generated by the coupled vibration of the core and windings. When an abnormal vibration signal occurs, it is difficult to distinguish between core and winding anomalies. This is particularly true for transformers in remote suburban areas with low year-round load factors. When the load factor is low, the contribution of winding vibration to the vibration signal is minimal. Mechanical anomalies such as winding deformation may not generate abnormal vibration signals, leading to misjudgments. Furthermore, high voltage harmonic distortion and load harmonic distortion in operating transformers can also affect the transformer vibration signal, causing misjudgments.

[0024] In response to the above problems, an embodiment of the present invention provides a method embodiment for monitoring the mechanical state of a transformer winding. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0025] Figure 1 FIG. 1 is a flow chart of a method for monitoring the mechanical state of a transformer winding according to an embodiment of the present invention. Figure 1 As shown, the method includes the following steps:

[0026] Step S102, obtaining the load harmonic distortion rate and voltage harmonic distortion rate of the target transformer;

[0027] Step S104, comparing the load harmonic distortion rate and the voltage harmonic distortion rate with a first predetermined threshold value to obtain a first comparison result;

[0028] Step S106: Based on the first comparison result, collecting a vibration signal of the target transformer;

[0029] Step S108: determining a mechanical state monitoring result of the winding in the target transformer based on the vibration signal.

[0030] When the load harmonic distortion rate and / or voltage harmonic distortion rate of the target transformer is high, it will affect the vibration signal of the target transformer, resulting in the inability to accurately judge the mechanical state of the winding of the target transformer. Therefore, before collecting the vibration signal of the target transformer, the embodiment of the present invention first obtains the load harmonic distortion rate and voltage harmonic distortion rate of the target transformer, and compares the load harmonic distortion rate and voltage harmonic distortion rate with a first predetermined threshold value respectively to obtain a first comparison result, that is, to judge whether the load harmonic distortion rate and / or voltage harmonic distortion rate of the current target transformer is high, and then collects the target transformer according to the first comparison result. For example, when the first comparison result is that the load harmonic distortion rate is less than the first predetermined threshold value and the voltage harmonic distortion rate is less than the first predetermined threshold value, the vibration signal of the target transformer is collected; and when the first comparison result is that either the load harmonic distortion rate or the voltage harmonic distortion rate is greater than the first predetermined threshold value, the vibration signal of the target transformer is not collected, so as to ensure that the vibration signal collected in this embodiment is not affected by the load harmonic distortion rate or the voltage harmonic distortion rate or is less affected, thereby improving the reliability of the vibration signal and the accuracy of judging the mechanical state of the target transformer winding based on the vibration signal.

[0031] It should be noted that the target transformer in this embodiment may be a transformer in operation.

[0032] It should be noted that the above-mentioned first predetermined threshold can be set separately for the load harmonic distortion rate and the voltage harmonic distortion rate, that is, the load harmonic distortion rate and the voltage harmonic distortion rate can be compared corresponding to different first predetermined thresholds, or the same first predetermined threshold can be set for the load harmonic distortion rate and the voltage harmonic distortion rate. The value of the first predetermined threshold can also be specifically set according to actual application, for example, 3%, 5%, 8%, etc.

[0033] As an optional embodiment, based on the first comparison result, the vibration signal of the target transformer is collected, including: when the first comparison result is that the load harmonic distortion rate is less than the first predetermined threshold and the voltage harmonic distortion is less than the first predetermined threshold, obtaining the load rate of the target transformer; comparing the load rate of the target transformer with the second predetermined threshold to obtain a second comparison result; based on the second comparison result, collecting the vibration signal.

[0034] For a running transformer, its vibration signal is generated by the coupled vibration of the core and winding. When the load factor of the transformer is low, the contribution of the winding vibration to the vibration signal is small. At this time, if the vibration signal is abnormal, it is difficult to distinguish whether it is caused by the core abnormality or the winding abnormality, and it is also difficult to determine the mechanical state of the target transformer winding. Therefore, in this embodiment, based on the first comparison result, that is, after determining that the load harmonic distortion rate and the voltage harmonic distortion rate are both less than the first predetermined threshold, the current load factor of the target transformer is further obtained, that is, the ratio of the current voltage of the target transformer to the rated voltage, and the load factor is compared with the second predetermined threshold to determine whether the load factor of the target transformer is small. For example, if the load factor of the target transformer is greater than or equal to the second predetermined threshold, then the vibration signal can be collected at this time, and the mechanical state of the target transformer winding can be accurately determined based on the vibration signal collected at this time.

[0035] It should be noted that the value of the second predetermined threshold can be specifically set according to actual applications, for example, 50%, etc.

[0036] As an optional embodiment, based on the second comparison result, collecting a vibration signal includes: when the second comparison result is that the load rate of the target transformer is less than a second predetermined threshold, determining a load transfer strategy between the target transformer and the load transfer transformer; based on the load transfer strategy, transferring the load of the load transfer transformer to the target transformer until the load rate of the target transformer is greater than or equal to the second predetermined threshold, and collecting a vibration signal.

[0037] When the second comparison result is that the load rate of the target transformer is less than the second predetermined threshold, that is, the load rate of the current target transformer is too small, in order to ensure that the collected vibration signal can be used to accurately infer the mechanical state of the winding, this embodiment adopts a load control method to formulate a load transfer strategy for one or more load transfer transformers connected in parallel with the target transformer, and transfer the load of the load transfer transformer to the target transformer to increase the load rate of the target transformer, thereby increasing the contribution of the winding vibration in the target transformer to the vibration signal. When the load rate of the target transformer is greater than or equal to the second predetermined threshold, it means that the contribution of the winding vibration in the target transformer to the vibration signal is large enough, and the mechanical state of the winding can be judged by the vibration signal. At this time, the vibration signal continues to be collected.

[0038] As an optional embodiment, before determining the transfer strategy between the target transformer and the load transfer transformer, it also includes: determining a candidate transformer connected in parallel with the target transformer; obtaining the load rate of the candidate transformer; and determining the load transfer transformer based on the load rate of the candidate transformer.

[0039] When determining the load transfer transformer, any transformer or all transformers connected in parallel with the target transformer can be directly determined as the load transfer transformer, and the load amount that needs to be transferred to the target transformer can be determined according to the load rate of the load transfer transformer. Alternatively, the load rate of each candidate transformer connected in parallel with the target transformer can be obtained first, and the load transfer transformer can be determined according to the size of its load rate. For example, the candidate transformer with the largest current load rate can be determined as the load transfer transformer, or all candidate transformers whose current load rate exceeds a predetermined threshold can be determined as load transfer transformers. The candidate transformers can also be sorted from large to small according to the load rate, and the candidate transformers ranked in the top few positions can be determined as load transfer transformers based on the sorting results, and so on.

[0040] As an optional embodiment, the above method further includes: monitoring the oil temperature of the target transformer during the collection of the vibration signal; and transferring the load transferred to the target transformer back to the load transfer transformer when the oil temperature is greater than an alarm value.

[0041] To protect the normal operation of the target transformer, this embodiment monitors the oil temperature of the target transformer in real time during the process of collecting vibration signals after transferring part of the load of the load transfer transformer to the target transformer. When the oil temperature is greater than the alarm value, the load transferred to the target transformer is promptly transferred back to the load transfer transformer.

[0042] As an optional embodiment, the above method further includes: after the vibration signal acquisition is completed, transferring the load transferred to the target transformer back to the load transfer transformer.

[0043] After the vibration signal collection is completed, on the one hand, the load transferred to the target transformer can be transferred back to the load transfer transformer. On the other hand, the load transferred to the target transformer can be retained in the target transformer or distributed according to other distribution strategies based on the current load rate of the load transfer transformer. For example, if the current load rate of the load transfer transformer is high, in order to avoid overloading the load transfer transformer after the load is transferred back, the load can be retained in the target transformer. For example, if there are multiple load transfer transformers and the load rate of one of the load transfer transformers is high, the load transferred to the target transformer can be transferred to other load transfer transformers according to a certain distribution ratio, and so on.

[0044] As an optional embodiment, based on the vibration signal, the mechanical state monitoring result of the winding in the target transformer is determined, including: extracting the high-frequency vibration component in the vibration signal; when the high-frequency vibration component is greater than the warning value, determining that the mechanical state monitoring result of the winding in the target transformer is an abnormal winding mechanical state. On the basis of ensuring that the collected vibration signal can be used to accurately infer the mechanical state of the target transformer winding, the collected vibration signal can be analyzed and processed, for example, the high-frequency vibration component is extracted from the vibration signal, and then the extracted high-frequency vibration component is compared with the warning value. If the high-frequency vibration component is greater than the warning value, it means that the vibration signal is abnormal, that is, the winding of the target transformer is abnormal, for example, the winding is loose, the winding is deformed, etc., thereby achieving the purpose of judging the mechanical state of the target transformer winding based on the vibration signal.

[0045] Based on the above embodiments and optional embodiments, the present invention proposes an optional implementation manner, which is described below.

[0046] An optional embodiment of the present invention proposes a method and device for intelligently controlling the load rate of an in-service transformer and comprehensively monitoring the mechanical state of the windings.

[0047] The device mainly includes a load monitoring module, a load control module, a transformer oil temperature monitoring module, a harmonic monitoring module, and a vibration monitoring and processing module.

[0048] Figure 2 Flowchart of the method for intelligently controlling the load rate of an operating transformer and comprehensively monitoring the mechanical state of the windings according to an optional embodiment of the present invention. Figure 2 As shown, in combination with the above modules, the device proposed in the optional implementation manner of the present invention is described below.

[0049] (1) The load monitoring module monitors the load rate of the target transformer and the load transfer transformer in real time.

[0050] (2) The harmonic monitoring module monitors the load harmonic distortion rate and voltage harmonic distortion rate of the target transformer in real time.

[0051] (3) When any one of the load harmonic distortion rate and voltage harmonic distortion rate of the target transformer is greater than 5%, the load control module and the vibration monitoring processing module are locked, that is, load regulation or vibration signal collection of the target transformer is prohibited at this time.

[0052] (4) When the target transformer load harmonic distortion rate and voltage harmonic distortion rate are both less than 5%, and the target transformer load rate is greater than 50%, a command can be directly sent to the vibration monitoring module to collect the vibration monitoring signal.

[0053] (5) When the target transformer load and voltage harmonic distortion rate are both less than 5% and the target transformer load rate is less than 50%, an unlocking instruction is issued to the load control module. The load control module transfers the load of another transformer in the substation (i.e., the load transfer transformer) to the target transformer as required. When the target transformer load rate is greater than 50%, the load transfer is stopped and a locking instruction is issued to the load control module. At the same time, an instruction is issued to the vibration monitoring module to collect vibration monitoring signals. After the load transfer, the transformer oil temperature monitoring module is immediately started to monitor the target transformer oil temperature to protect the transformer operation. After the vibration signal collection is completed, the load control device is started again to transfer the aforementioned load back to the original transformer. During the vibration signal collection period, if it is detected that the target transformer oil temperature exceeds the alarm value, the load control device is immediately started to transfer the aforementioned transferred load back to the original transformer.

[0054] (6) The vibration monitoring and processing module has a built-in evaluation algorithm that can analyze and process the collected vibration signals and extract the high-frequency vibration components in the vibration signals.

[0055] (7) When the high-frequency component of the vibration exceeds the warning value, it is judged that the mechanical state of the winding is abnormal; otherwise, it is judged that the mechanical state of the winding is normal.

[0056] According to an embodiment of the present invention, a device for monitoring the mechanical state of a transformer winding is also provided. Figure 3 FIG. 1 is a structural block diagram of a device for monitoring the mechanical state of a transformer winding according to an embodiment of the present invention. Figure 3 As shown, the device includes: an acquisition module 31, a comparison module 32, a collection module 33 and a determination module 34. The device is described below.

[0057] An acquisition module 31 is used to acquire the load harmonic distortion rate and voltage harmonic distortion rate of the target transformer; a comparison module 32 is connected to the acquisition module 31 and is used to compare the load harmonic distortion rate and the voltage harmonic distortion rate with a first predetermined threshold value, respectively, to obtain a first comparison result; an acquisition module 33 is connected to the comparison module 32 and is used to acquire the vibration signal of the target transformer based on the first comparison result; a determination module 34 is connected to the acquisition module 33 and is used to determine the mechanical condition monitoring result of the winding in the target transformer based on the vibration signal.

[0058] According to an embodiment of the present invention, a computer-readable storage medium is also provided, which includes a stored program, wherein when the program is running, the device where the computer-readable storage medium is located is controlled to execute any of the above-mentioned methods for monitoring the mechanical state of the transformer winding.

[0059] According to an embodiment of the present invention, a computer device is also provided, comprising: a memory and a processor, wherein the memory stores a computer program; and the processor is configured to execute the computer program stored in the memory, wherein when the computer program is executed, the processor executes any one of the above-mentioned methods for monitoring the mechanical state of a transformer winding.

[0060] The serial numbers of the above embodiments of the present invention are for description only and do not represent the advantages or disadvantages of the embodiments.

[0061] In the above embodiments of the present invention, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0062] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only exemplary. For example, the division of the units can be a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0063] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0064] In addition, the functional units in the various embodiments of the present invention may be integrated into a single processing unit, each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0065] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, server or network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic disk or optical disk, etc. Various media that can store program codes.

[0066] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A method for monitoring the mechanical state of a transformer winding, characterized in that: include: Obtain the load harmonic distortion rate and voltage harmonic distortion rate of the target transformer; Comparing the load harmonic distortion rate and the voltage harmonic distortion rate with first predetermined thresholds respectively to obtain a first comparison result; Based on the first comparison result, collecting a vibration signal of the target transformer; Determining a mechanical condition monitoring result of a winding in the target transformer based on the vibration signal; The step of collecting the vibration signal of the target transformer based on the first comparison result includes: obtaining the load rate of the target transformer when the first comparison result is that the load harmonic distortion rate is less than the first predetermined threshold and the voltage harmonic distortion is less than the first predetermined threshold; comparing the load rate of the target transformer with a second predetermined threshold to obtain a second comparison result; and collecting the vibration signal based on the second comparison result. Wherein, collecting the vibration signal based on the second comparison result includes: when the second comparison result is that the load rate of the target transformer is less than the second predetermined threshold, determining a load transfer strategy between the target transformer and the load transfer transformer; based on the load transfer strategy, transferring the load of the load transfer transformer to the target transformer until the load rate of the target transformer is greater than or equal to the second predetermined threshold, and collecting the vibration signal.

2. The method according to claim 1, characterized in that Before determining the load transfer strategy between the target transformer and the load transfer transformer, the method further includes: determining a candidate transformer connected in parallel with the target transformer; Obtaining the load rate of the candidate transformer; The load transfer transformer is determined based on the load rate of the candidate transformer.

3. The method according to claim 1, characterized in that The method further comprises: During the collection of the vibration signal, monitoring the oil temperature of the target transformer; When the oil temperature is greater than an alarm value, the load transferred to the target transformer is transferred back to the load transfer transformer.

4. The method according to claim 1, wherein The method further comprises: After the vibration signal acquisition is completed, the load transferred to the target transformer is transferred back to the load transfer transformer.

5. The method according to any one of claims 1 to 4, characterized in that Determining a mechanical condition monitoring result of a winding in the target transformer based on the vibration signal includes: extracting a high-frequency vibration component from the vibration signal; When the high-frequency vibration component is greater than the warning value, it is determined that the mechanical state monitoring result of the winding in the target transformer is abnormal.

6. A device for monitoring the mechanical state of a transformer winding, characterized in that: include: An acquisition module is used to obtain the load harmonic distortion rate and voltage harmonic distortion rate of the target transformer; a comparison module, configured to compare the load harmonic distortion rate and the voltage harmonic distortion rate with a first predetermined threshold value, respectively, to obtain a first comparison result; an acquisition module, configured to acquire a vibration signal of the target transformer based on the first comparison result; a determination module, configured to determine a mechanical condition monitoring result of a winding in the target transformer based on the vibration signal; The acquisition module is further configured to, when the first comparison result is that the load harmonic distortion rate is less than the first predetermined threshold and the voltage harmonic distortion is less than the first predetermined threshold, obtain the load rate of the target transformer; compare the load rate of the target transformer with a second predetermined threshold to obtain a second comparison result; and acquire the vibration signal based on the second comparison result; Among them, the acquisition module is also used to determine the load transfer strategy between the target transformer and the load transfer transformer when the second comparison result is that the load rate of the target transformer is less than the second predetermined threshold; based on the load transfer strategy, transfer the load of the load transfer transformer to the target transformer until the load rate of the target transformer is greater than or equal to the second predetermined threshold, and collect the vibration signal.

7. A computer-readable storage medium, characterized in that The computer-readable storage medium includes a stored program, wherein when the program is executed, the device where the computer-readable storage medium is located is controlled to execute the method for monitoring the mechanical state of a transformer winding according to any one of claims 1 to 5.

8. A computer device, characterized in that: include: memory and processor, The memory stores a computer program; The processor is configured to execute a computer program stored in the memory, and when the computer program is run, the processor is enabled to execute the method for monitoring the mechanical state of a transformer winding according to any one of claims 1 to 5.

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