Transformer protection method, transformer protection device, and computer-readable storage medium

Abstract

The application discloses a transformer protection method, a transformer protection device and a computer readable storage medium. The transformer comprises a transformer body and an oil pressure release valve connected with the transformer body. The transformer protection method comprises the following steps: acquiring current oil pressure in the transformer body; comparing the current oil pressure with preset oil pressure, and acquiring current oil level according to the current oil pressure and comparing the current oil level with preset oil level; issuing a first alarm when the current oil pressure reaches the preset oil pressure, and issuing a second alarm when the current oil level reaches the preset oil level. The transformer protection method can protect the transformer through oil pressure and oil level obtained from the oil pressure.

Description

Technical Field

[0001] This invention relates to the field of transformer technology, and in particular to a transformer protection method, a transformer protection device, and a computer-readable storage medium. Background Technology

[0002] With the continuous expansion of the power grid, the operating conditions of transformers are becoming increasingly complex, and the operating status of transformers directly affects the power grid. Transformer oil pressure relief valves are crucial components for transformer protection, as they detect the oil pressure inside the transformer and take corresponding actions to protect it. However, based on field operating experience, oil pressure relief valves may malfunction, affecting the reliable operation of the transformer. Currently, due to the lack of dynamic monitoring and recording of oil pressure characteristics, field operators cannot promptly detect potential faults, and there are no effective means for fault analysis after a fault occurs. During transformer operation, oil level, oil temperature, and pressure are highly correlated with the reliable operation of the transformer. Many faults are caused by elevated oil temperature, increased internal pressure, and abnormal oil levels. For example, to better adapt to oil pressure relief valves and ensure transformer operation, standard oil temperature-oil level curves are typically set at the factory. However, during actual oil filling operations, because oil breathing and immersion are slow processes, manufacturers often add slightly more oil to ensure sufficient quantity, potentially leading to overfilling. When a transformer is in operation, the effect of thermal expansion and contraction causes the oil temperature to rise and the oil pressure to increase, resulting in an abnormal oil level. This, in turn, causes the oil pressure relief valve to malfunction and damage the transformer.

[0003] In view of the above-mentioned deficiencies, it is necessary to provide a new transformer protection method, transformer protection device, and computer-readable storage medium. Summary of the Invention

[0004] The main objective of this invention is to provide a transformer protection method, a transformer protection device, and a computer-readable storage medium, aiming to solve the problem that existing methods of protecting transformers based on oil pressure are not very effective.

[0005] To achieve the above objectives, the present invention proposes a transformer protection method, wherein the transformer includes a transformer body and an oil pressure relief valve connected to the transformer body, and the transformer protection method includes the following steps:

[0006] Obtain the current oil pressure inside the transformer body;

[0007] Compare the current oil pressure with the preset oil pressure, and obtain the current oil level based on the current oil pressure, and compare the current oil level with the preset oil level;

[0008] A first alarm is issued when the current oil pressure reaches the preset oil pressure, and a second alarm is issued when the current oil level reaches the preset oil level.

[0009] Preferably, after the steps of comparing the current oil pressure and the preset oil pressure, obtaining the current oil level based on the current oil pressure, and comparing the current oil level and the preset oil level, the method further includes:

[0010] When the current oil pressure reaches the oil pressure threshold, the oil pressure release valve is opened, and the oil pressure threshold is greater than the preset oil pressure.

[0011] Preferably, the step of comparing the current oil pressure with the preset oil pressure, obtaining the current oil level based on the current oil pressure, and comparing the current oil level with the preset oil level further includes:

[0012] Obtain the current oil temperature inside the transformer body;

[0013] The steps of comparing the current oil pressure with the preset oil pressure, obtaining the current oil level based on the current oil pressure, and comparing the current oil level with the preset oil level include:

[0014] When the current oil pressure reaches the preset oil pressure, the actual oil temperature and oil level curve is obtained based on the change of the current oil temperature and the current oil level over time within a preset time period.

[0015] The actual oil temperature and level curve is compared with the preset oil temperature and level curve to determine whether the current oil level is reasonable. The preset oil temperature and level curve is the curve of the preset oil level changing with the preset oil temperature within a preset time period.

[0016] Preferably, the step of comparing the actual oil temperature and level curve with a preset oil temperature and level curve to determine whether the current oil level is reasonable, wherein the preset oil temperature and level curve is a curve showing the change of the preset oil level with the preset oil temperature over a preset time period, includes:

[0017] Calculate the difference between the current oil level and the preset oil level;

[0018] If the difference is outside the preset difference range, the current oil level is determined to be unreasonable.

[0019] Preferably, after the steps of comparing the current oil pressure and the preset oil pressure, obtaining the current oil level based on the current oil pressure, and comparing the current oil level and the preset oil level, the method further includes:

[0020] When the current oil pressure reaches the preset oil pressure, the current oil pressure is stored.

[0021] Preferably, after the step of storing the current oil pressure when the current oil pressure reaches the preset oil pressure, the method further includes:

[0022] Store the current oil temperature.

[0023] Preferably, the step of storing the current oil temperature includes:

[0024] The current oil pressure and current oil temperature at the same moment are stored in a mapping table.

[0025] Preferably, after the step of storing the current oil temperature, the method further includes:

[0026] The current oil temperature and current oil pressure are sent to external devices for storage and analysis.

[0027] Furthermore, to achieve the above objectives, the present invention also proposes a transformer protection device, wherein the transformer includes a transformer body and an oil pressure relief valve connected to the transformer body, and the transformer protection device includes:

[0028] The processor, sensing components, alarm, memory, and transformer protection program stored in the memory and executable on the processor, wherein:

[0029] The sensing component includes an oil pressure sensor, which is used to detect the current oil pressure inside the transformer body and send it to the processor;

[0030] The processor is used to control the alarm to sound.

[0031] When the transformer protection program is executed by the processor, it implements the steps of the transformer protection method as described above.

[0032] In addition, the present invention also proposes a computer-readable storage medium storing a transformer protection program, which, when executed by a processor, implements the steps of the transformer protection method as described above.

[0033] In this invention, the transformer includes a transformer body and an oil pressure relief valve connected to the transformer body. The transformer protection method includes the following steps: acquiring the current oil pressure within the transformer body; comparing the current oil pressure with a preset oil pressure, and acquiring the current oil level based on the current oil pressure, and comparing the current oil level with the preset oil level; issuing a first alarm when the current oil pressure reaches the preset oil pressure, and issuing a second alarm when the current oil level reaches the preset oil level. This transformer protection method takes the transformer's oil pressure as the research object, compares the current oil pressure with a preset oil pressure, and issues a first alarm when the current oil pressure reaches the preset oil pressure. Furthermore, it acquires the current oil level based on the current oil pressure and issues a second alarm when the current oil level reaches the preset oil level. By collecting the current oil pressure in real time and determining whether the current oil pressure and current oil level are reasonable, and providing corresponding feedback when unreasonable, that is, issuing a corresponding early warning before the oil pressure relief valve operates, the method protects the transformer to ensure normal operation.

[0034] The beneficial effects of adopting the above technical solution are as follows:

[0035] (1) This technical solution can monitor oil temperature and oil level values ​​and transmit these values ​​remotely via a low-power microprocessor system. Considering the need for more efficient on-site analysis, the system also includes a local storage module. This module can activate storage logic when the pressure reaches the alarm threshold, recording the pressure and temperature changes before and during the alarm. The recording medium is a small TF memory card. Maintenance and analysis personnel can easily remove the TF card to read and analyze the data, facilitating the monitoring and analysis of the transformer's operating status.

[0036] (2) The default data format is an Excel spreadsheet, which makes it easy to draw change curves. By combining the characteristics of pressure and temperature changes, the transformer oil quantity / level can be evaluated to determine whether it is appropriate. This allows for planned oil replenishment or drainage, and provides early warning of possible oil pressure relief valve operation trends inside the transformer, thereby improving the reliability of transformer operation. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0038] Figure 1 This is a flowchart illustrating a transformer protection method according to an embodiment of the present invention;

[0039] Figure 2 This is a schematic diagram of the transformer structure in one embodiment of the present invention;

[0040] Figure 3 This is a cross-sectional schematic diagram of an oil storage tank in one embodiment of the present invention;

[0041] Figure 4 This is a structural block diagram of a transformer protection device according to an embodiment of the present invention;

[0042] Figure 5 This is a flowchart illustrating the operation of a transformer protection device in one embodiment of the present invention.

[0043] Explanation of icon numbers:

[0044]

[0045]

[0046] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0047] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0048] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0049] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0050] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0051] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0052] This invention proposes a transformer protection method, a transformer protection device, and a computer-readable storage medium, aiming to solve the problem of the poor effectiveness of existing transformer protection methods based on oil pressure.

[0053] Please refer to Figure 1 and Figure 4 , Figure 5 This invention proposes a transformer protection method, wherein the transformer includes a transformer body and an oil pressure relief valve connected to the transformer body, and the transformer protection method includes the following steps:

[0054] Step S10: Obtain the current oil pressure inside the transformer body;

[0055] Step S20: Compare the current oil pressure with the preset oil pressure, and obtain the current oil level based on the current oil pressure, and compare the current oil level with the preset oil level;

[0056] Step S30: Issue a first alarm when the current oil pressure reaches the preset oil pressure, and issue a second alarm when the current oil level reaches the preset oil level.

[0057] The transformer of the present invention includes a transformer body and an oil pressure relief valve connected to the transformer body. The transformer protection method takes the oil pressure of the transformer as the research object, compares the current oil pressure with the preset oil pressure, and issues a first alarm when the current oil pressure reaches the preset oil pressure. Moreover, it obtains the current oil level based on the current oil pressure and issues a second alarm when the current oil level reaches the preset oil level. By collecting the current oil pressure in real time and judging whether the current oil pressure and current oil level are reasonable, and making corresponding feedback when they are unreasonable, that is, giving a corresponding early warning before the oil pressure relief valve is activated, so as to protect the transformer to operate normally.

[0058] This invention provides a scientific, reasonable, and comprehensive transformer protection method. It enables the design of an oil pressure relief valve capable of monitoring oil temperature and pressure based on the structural characteristics of the valve. First, the required sensor parameters for oil temperature and pressure of the transformer oil pressure relief valve are clearly defined, such as the upper and lower limits of oil temperature, the maximum range of oil pressure, and resolution. Based on these parameters, the material, volume, power supply, and output method of the sensor are selected according to their characteristics. Second, the structural parameters of the transformer oil pressure relief valve are limited according to the structural requirements to ensure the feasibility and requirements of on-site installation and measurement. After determining the structure based on the selected parameters, the sensor is selected based on the electrical parameters. Then, the processing circuit and functions are designed, ultimately achieving the integration of the structure and hardware. This includes designing the volume of the oil temperature and pressure sensor probes in contact with the oil, the signal extraction method, and oil leakage prevention measures. The insulation, installation, and electromagnetic shielding of the circuit board where the processor 4 is located are also considered. Third, based on the proposed transformer oil pressure relief valve structure, traditional oil pressure relief valve structural parameters for optimization are selected.

[0059] The selection of oil pressure sensor 22 is based on the upper and lower limits of the oil level change in the transformer, and the selection of oil temperature sensor 21 is based on the upper and lower limits of the top oil temperature of the transformer. Both oil pressure sensor 22 and oil temperature sensor 21 are immersed in oil during operation, and their lifespan during long-term oil immersion operation should be considered when selecting them.

[0060] The transformer includes an oil conservator 20 connected to the transformer body 10 and a breather vent pipe 30 connected to the oil conservator 20. The top end of the breather vent pipe 30 is connected to the bottom end of the oil conservator 20, and an oil pressure sensor 22 is installed at the bottom end of the breather vent pipe 30. The processor 3 is also used to control the alarm 5 to sound when the current oil pressure reaches the preset oil pressure. To enable on-site personnel to know the current oil pressure status, the processor 3 controls the alarm 5 to sound when the current oil pressure reaches the preset oil pressure, and on-site personnel can know that the current oil pressure has reached the preset oil pressure based on the alarm status. The alarm 5 can be a warning light, a buzzer, etc.

[0061] In one embodiment, step S20 is followed by:

[0062] When the current oil pressure reaches the oil pressure threshold, the oil pressure release valve is opened, and the oil pressure threshold is greater than the preset oil pressure.

[0063] When the current oil pressure reaches the oil pressure threshold, the processor 3 controls the valve body 1 of the oil pressure relief valve to open the transformer body 10, so as to release the pressure inside the transformer body 10 and protect the transformer.

[0064] Furthermore, the procedure prior to step S20 also includes:

[0065] Obtain the current oil temperature inside the transformer body;

[0066] Step S20 includes:

[0067] When the current oil pressure reaches the preset oil pressure, the actual oil temperature and oil level curve is obtained based on the change of the current oil temperature and the current oil level over time within a preset time period.

[0068] The actual oil temperature and level curve is compared with the preset oil temperature and level curve to determine whether the current oil level is reasonable. The preset oil temperature and level curve is the curve of the preset oil level changing with the preset oil temperature within a preset time period.

[0069] Oil temperature sensor 21 is installed inside the transformer body 10. Processor 3 is also used to obtain the actual oil temperature and level curve based on the change of current oil temperature and current oil level over time when the current oil pressure reaches the preset oil pressure. By comparing the actual oil temperature and level curve with the preset oil temperature and level curve, alarm 5 is controlled to sound when the comparison is inconsistent. For the transformer oil pressure relief valve, two alarm conditions are designed: one is that the current oil pressure is close to the preset oil pressure for the transformer oil pressure relief valve to operate; the other is that the relationship between oil temperature and oil level does not conform to the oil temperature and oil level relationship curve designed by the factory. When the actual oil temperature and level curve is inconsistent with the preset oil temperature and level curve, alarm 5 can be controlled by processor 3 to sound an alarm, so as to diagnose in real time whether there is a problem of insufficient oil or excessive oil in the transformer. The following uses the time window adjustment algorithm to derive and explain this, calculate the change of current oil temperature and current oil pressure, evaluate whether the relationship curve between current oil level and current oil temperature is reasonable, and guide the operation and maintenance personnel to add or drain oil.

[0070] Please combine Figure 2 and Figure 3 As shown, the derivation relationship used to calculate the oil temperature and oil level curves for an oil tank 20 with a circular cross-section is explained:

[0071] ΔV=BG0.9*Δt(1)

[0072] ΔV - the volume of change, in meters 3

[0073] B - Transformer oil expansion coefficient

[0074] G - Total oil weight of the transformer, KG

[0075] Δt - Change in oil temperature, °C

[0076] Dividing the changed volume ΔV by the length L of the oil tank 20 yields the changed area ΔS. Area S should be equal to half the area of ​​the circle minus the area of ​​the sector corresponding to angle α, plus the area of ​​ΔAOB, i.e.:

[0077]

[0078] Divide equation (1) by L to get equation (3).

[0079]

[0080] The parameters of the transformer are: G, B, R, and L, which are constants.

[0081] Equation (3) can be used to determine the oil level height h corresponding to different oil temperature variations Δt.

[0082] As can be seen from the above, the transformer oil pressure relief valve can calculate the corresponding oil level h1 by measuring different oil temperature changes. The oil pressure sensor 22 in the transformer oil pressure relief valve can measure the oil level h2 based on the linear relationship between oil level and oil pressure. By comparing the calculated oil level h1 with the measured oil level h2, it can be inferred whether the oil level at the current oil temperature is reasonable, and then whether it conforms to the oil temperature and oil level relationship designed by the factory.

[0083] In another embodiment, the step of comparing the actual oil temperature and level curve with a preset oil temperature and level curve to determine whether the current oil level is reasonable, wherein the preset oil temperature and level curve is a curve showing the change of the preset oil level with the preset oil temperature over a preset time period, includes:

[0084] Calculate the difference between the current oil level and the preset oil level;

[0085] If the difference is outside the preset difference range, the current oil level is determined to be unreasonable.

[0086] Processor 3 is used to calculate the current oil level based on the current oil pressure, calculate the difference between the current oil level and the preset oil level, and compare the difference with the preset difference range. When the difference is outside the preset difference range, it indicates that the current oil level is unreasonable. The processor determines whether the preset oil level is reasonable in order to better protect the transformer. In this embodiment, the current oil level can be calculated through the linear relationship between the current oil pressure and the current oil level. By comparing the preset oil level and the current oil level, when the preset oil level and the current oil level are not equal, the oil pressure and oil temperature can be adjusted to achieve a balance between the two.

[0087] The process after step S20 also includes:

[0088] When the current oil pressure reaches the preset oil pressure, the current oil pressure is stored.

[0089] The transformer oil pressure relief valve also includes a memory 4 electrically connected to the processor 3. The processor 3 is also used to store the current oil pressure in the memory 4 when the current oil pressure reaches the preset oil pressure. For better on-site analysis, a local memory 4 can be designed. The processor 3 activates the memory 4 when the oil pressure reaches the alarm threshold, i.e., the preset oil pressure. Because the oil pressure of the transformer oil pressure relief valve is continuously collected, the changes in oil pressure and oil temperature before, during, and after the alarm are recorded. The recording medium is a USB flash drive or memory card, and maintenance analysts can extract the storage medium for data analysis at any time. Furthermore, the changes can be recorded based on the alarm threshold, i.e., the preset oil pressure, as a trigger condition, thus serving as an effective means of fault early warning and post-fault analysis.

[0090] Furthermore, in order to achieve multiple functions, after the step of storing the current oil pressure when the current oil pressure reaches the preset oil pressure, the method further includes:

[0091] Store the current oil temperature.

[0092] Processor 3 is also used to store the current oil temperature in memory 4. For more comprehensive analysis, the current oil temperature can be stored in memory 4.

[0093] Additionally, in the above embodiments, the step of storing the current oil temperature includes:

[0094] The current oil pressure and the current oil temperature at the same moment are stored in a mapping table.

[0095] The memory 4 is a read / write memory. The processor 3 is also used to store the current oil pressure and current oil temperature at the same moment in the memory 4 as a mapping table. The read data is in Excel format, which makes it easier to plot the change curves. This allows for the assessment of whether the transformer oil quantity is appropriate based on the change characteristics of oil pressure and oil temperature, thereby providing early warning of possible transformer oil pressure relief valve operation trends inside the transformer.

[0096] In one embodiment, the step of storing the current oil temperature further includes:

[0097] The current oil temperature and current oil pressure are sent to external devices for storage and analysis.

[0098] The transformer oil pressure relief valve also includes a communicator electrically connected to the processor 3. The processor 3 is also used to communicate with external devices via the communicator to send the current oil temperature and current oil pressure to the external devices. To enable remote analysis, the oil temperature and oil level values ​​can be remotely transmitted to the external devices via a low-power microprocessor system, where the external devices can analyze the oil temperature and oil level values.

[0099] Additionally, please combine Figure 4As shown, the present invention also proposes a transformer protection device. The transformer includes a transformer body 10 and an oil pressure relief valve connected to the transformer body. The transformer protection device includes a processor 3, a sensing component 2, an alarm 4, a memory 5, and a transformer protection program stored in the memory 5 and executable on the processor 3. The sensing component 2 includes an oil pressure sensor 22, which is used to detect the current oil pressure inside the transformer body and send it to the processor 3. The processor 3 is used to control the alarm 4 to sound an alarm. When the transformer protection program is executed by the processor 3, it implements the steps of the transformer protection method described above.

[0100] The transformer of the present invention includes a transformer body 10 and an oil pressure relief valve connected to the transformer body 10. The transformer protection device includes a processor 3, an alarm 5, and a sensing component 2. In one embodiment, the oil pressure relief valve includes a valve body 1, and the sensing component 2 includes an oil temperature sensor 21 and an oil pressure sensor 22. The valve body 1, the oil temperature sensor 21, the oil pressure sensor 22, and the alarm 5 are electrically connected to the processor 3. When it is necessary to detect the oil temperature and oil pressure of the transformer, the oil temperature sensor 21 detects the current oil temperature in the oil tank 20 and sends the current oil temperature to the processor 3. The oil pressure sensor 22 detects the current oil pressure in the breather vent pipe 30 and sends the current oil pressure to the processor 3. The processor 3 receives the current oil temperature and current oil pressure, compares the current oil pressure with a preset oil pressure, and controls the alarm 5 to issue a first alarm when the current oil pressure reaches the preset oil pressure. When the current oil level reaches the preset oil level, it controls the alarm 5 to issue a second alarm. The present invention relates to a transformer body and an oil pressure relief valve connected to the transformer body. The transformer protection method takes the transformer's oil pressure as the research object, compares the current oil pressure with the preset oil pressure, and issues a first alarm when the current oil pressure reaches the preset oil pressure. Furthermore, it obtains the current oil level based on the current oil pressure and issues a second alarm when the current oil level reaches the preset oil level. By collecting the current oil pressure in real time and judging whether the current oil pressure and current oil level are reasonable, and making corresponding feedback when they are unreasonable, that is, giving a corresponding early warning before the oil pressure relief valve operates, the transformer can be protected to operate normally.

[0101] The transformer body 10 and the oil pressure relief valve are installed on the upper part of the transformer body 10. An oil conservator 20 is connected to the top of the transformer body 10, and a breather vent pipe 30 is provided at the bottom of the oil conservator 20. The oil pressure sensor 21 and the oil temperature sensor 22 are both installed inside the valve body 1 of the oil pressure relief valve, so that the pressure borne by the oil pressure relief valve can be collected in real time. When the pressure reaches the threshold, the pressure will be released through the breather vent pipe 30.

[0102] In addition, the present invention proposes a computer-readable storage medium, characterized in that the computer-readable storage medium stores a transformer protection program, which, when executed by a processor, implements the steps of the transformer protection method described above.

[0103] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A transformer protection method, wherein the transformer includes a transformer body, an oil conservator connected to the transformer body, and an oil pressure relief valve connected to the transformer body, wherein the oil pressure relief valve is equipped with an oil pressure sensor, characterized in that, The transformer protection method includes the following steps: Obtain the current oil pressure inside the transformer body; Compare the current oil pressure with the preset oil pressure, and obtain the current oil level based on the current oil pressure, and compare the current oil level with the preset oil level; A first alarm is issued when the current oil pressure reaches the preset oil pressure, and a second alarm is issued when the current oil level reaches the preset oil level; Before the steps of comparing the current oil pressure with the preset oil pressure, obtaining the current oil level based on the current oil pressure, and comparing the current oil level with the preset oil level, the method further includes: Obtain the current oil temperature inside the transformer body; The steps of comparing the current oil pressure with the preset oil pressure, obtaining the current oil level based on the current oil pressure, and comparing the current oil level with the preset oil level include: When the current oil pressure reaches the preset oil pressure, the actual oil temperature and oil level curve is obtained according to the change of the current oil temperature and the current oil level over time within a preset time. The change in volume is calculated by the change in oil temperature, the oil expansion coefficient and the total oil weight of the transformer. The preset oil level under the change in oil temperature is obtained by calculating the change in volume and the length L of the oil conservator. The actual oil temperature and level curve is compared with the preset oil temperature and level curve to determine whether the current oil level is reasonable. The preset oil temperature and level curve is the curve of the preset oil level changing with the preset oil temperature within a preset time. The step of comparing the actual oil temperature and level curve with the preset oil temperature and level curve to determine whether the current oil level is reasonable, wherein the preset oil temperature and level curve is a curve showing the change of the preset oil level with the preset oil temperature over a preset time period, includes: The oil pressure relief valve calculates the corresponding calculated oil level h1 by changing the oil temperature, and the oil pressure sensor can measure the actual oil level h2 based on the linear relationship between oil level and oil pressure. Calculate the difference between the measured oil level h2 and the calculated oil level h1; If the difference is outside the preset difference range, the current oil level is determined to be unreasonable.

2. The transformer protection method as described in claim 1, characterized in that, The steps of comparing the current oil pressure with the preset oil pressure, obtaining the current oil level based on the current oil pressure, and comparing the current oil level with the preset oil level further include: When the current oil pressure reaches the oil pressure threshold, the oil pressure release valve is opened, and the oil pressure threshold is greater than the preset oil pressure.

3. The transformer protection method as described in claim 1, characterized in that, The steps of comparing the current oil pressure with the preset oil pressure, obtaining the current oil level based on the current oil pressure, and comparing the current oil level with the preset oil level further include: When the current oil pressure reaches the preset oil pressure, the current oil pressure is stored.

4. The transformer protection method as described in claim 3, characterized in that, The step of storing the current oil pressure when the current oil pressure reaches the preset oil pressure further includes: Store the current oil temperature.

5. The transformer protection method as described in claim 4, characterized in that, The step of storing the current oil temperature includes: The current oil pressure and current oil temperature at the same moment are stored in a mapping table.

6. The transformer protection method as described in claim 4, characterized in that, Following the step of storing the current oil temperature, the following is also included: The current oil temperature and current oil pressure are sent to external devices for storage and analysis.

7. A transformer protection device, the transformer comprising a transformer body and an oil pressure relief valve connected to the transformer body, characterized in that, The transformer protection device includes: The processor, sensing components, alarm, memory, and transformer protection program stored in the memory and executable on the processor, wherein: The sensing component includes an oil pressure sensor, which is used to detect the current oil pressure inside the transformer body and send it to the processor; The processor is used to control the alarm to sound. When the transformer protection program is executed by the processor, it implements the steps of the transformer protection method as described in any one of claims 1 to 6.

8. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a transformer protection program, which, when executed by a processor, implements the steps of the transformer protection method as described in any one of claims 1 to 6.

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