Transformer, oil state monitoring method and device thereof and storage medium

Abstract

The invention discloses a transformer, an oil state monitoring method and device thereof and a storage medium, and relates to the technical field of transformers. The method comprises the following steps: acquiring oil parameter information of a transformer and parameter information of an environment where the transformer is located; determining the oil level variation of the transformer according to the oil parameter information and the environment parameter information; and determining the state of the transformer oil according to the oil parameter information under the condition that the oil level variation meets a preset condition. According to the oil state monitoring method, the oil state of the transformer can be monitored by obtaining the oil parameter information of the transformer and the parameter information of the environment where the transformer is located, and therefore safety accidents caused by the abnormal oil state of the transformer can be avoided to a certain extent.

Description

Technical Field

[0001] The present invention relates to the technical field of transformers, and in particular to a method for monitoring the oil status of a transformer, a device for monitoring the oil status of a transformer, a computer-readable storage medium and a transformer. Background Art

[0002] Transformer oil (insulating oil) has excellent insulation properties, can effectively isolate live parts, prevent electrical breakdown, absorb and take away the heat generated by the core and winding during operation, and can quickly extinguish the arc to prevent arc damage to the equipment. However, the oil level indicated by the transformer oil level gauge may not match the actual oil level, which makes it difficult for maintenance personnel to find the safety hazards of the transformer. For example, when the oil level on the oil level gauge is lower than the actual oil level, the maintenance personnel will add oil to the transformer oil conservator. After increasing the oil volume to the "normal" oil level based on the oil level gauge indication, the actual amount of oil in the oil conservator will be too much. At this time, if the ambient temperature rises or the load increases, the oil will expand due to heat and will spray out from the transformer's pressure releaser; when the oil level on the oil level gauge is higher than the actual oil level, the oil level gauge on the oil conservator indicates the oil level is "normal", but the actual oil level is already at a very low position. This situation will cause the insulation strength of the transformer's internal windings and casing to be insufficient. At this time, the first exposed bushing will discharge to the casing, causing unplanned equipment shutdown. Therefore, it is necessary to monitor the oil level status of the transformer and remind maintenance personnel when the oil level is abnormal, which can avoid safety accidents of the transformer to a certain extent. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems in the related art to a certain extent. To this end, the first object of the present invention is to provide a method for monitoring the oil state of a transformer, which can monitor the state of the transformer oil by obtaining the oil parameter information of the transformer and the environmental parameter information of the transformer, so that safety accidents caused by abnormal transformer oil state can be avoided to a certain extent.

[0004] A second object of the present invention is to provide a transformer oil condition monitoring device.

[0005] A third object of the present invention is to provide a computer-readable storage medium.

[0006] A fourth objective of the present invention is to provide a transformer.

[0007] To achieve the above-mentioned purpose, the first aspect of the embodiment of the present invention proposes a method for monitoring the oil status of a transformer, the method comprising: obtaining oil parameter information of the transformer and environmental parameter information of the transformer; determining the oil level change of the transformer according to the oil parameter information and the environmental parameter information; and determining the status of the transformer oil according to the oil parameter information when the oil level change meets a preset condition.

[0008] According to one embodiment of the present invention, the oil parameter information includes oil temperature, the environmental parameter information includes ambient temperature and ambient air pressure, and determining the oil level change of the transformer based on the oil parameter information and the environmental parameter information includes: obtaining the correspondence between the oil temperature under the current ambient temperature and the ambient air pressure; and determining the oil level change of the transformer based on the oil temperature correspondence.

[0009] According to an embodiment of the present invention, the oil parameter information includes oil temperature, the environmental parameter information includes ambient temperature, and obtaining the oil parameter information of the transformer includes: obtaining the transformer load; and determining the oil temperature according to the transformer load and the ambient temperature.

[0010] According to an embodiment of the present invention, the oil level change satisfies a preset condition, comprising: when the oil level change is within a preset range, determining that the oil level change satisfies the preset condition.

[0011] According to one embodiment of the present invention, the oil parameter information includes the oil level, and determining the state of the transformer oil according to the oil parameter information includes: when the transformer is in a full-load state, if the oil level is greater than a first preset oil level threshold, determining that the state of the transformer oil is at risk of overflow; when the transformer is in a no-load state, if the oil level is less than a second preset oil level threshold, determining that the state of the transformer oil is at risk of insufficient oil.

[0012] According to one embodiment of the present invention, the oil parameter information includes oil temperature, and obtaining the oil level of the transformer includes: obtaining the initial oil level by ultrasonic means; and correcting the initial oil level according to the oil temperature and the inclination angle of the transformer to obtain the oil level of the transformer.

[0013] According to one embodiment of the present invention, the initial oil level is corrected according to the oil temperature and the inclination angle of the transformer, including: determining a first compensation coefficient according to the oil temperature; determining a first oil level of the transformer according to the initial oil level and the first compensation coefficient; when the inclination angle of the transformer exceeds a preset angle threshold, determining a second compensation coefficient according to the inclination angle; determining the second oil level of the transformer according to the initial oil level and the second compensation coefficient; and determining the oil level of the transformer according to the first oil level and the second oil level.

[0014] According to one embodiment of the present invention, the oil parameter information includes: oil temperature, humidity and water-soluble acid. The state of the transformer oil is determined according to the oil parameter information, including: determining that the transformer oil is aged when any one of the following conditions is met: the oil temperature exceeds a preset temperature threshold, the humidity exceeds a preset humidity threshold, and the water-soluble acid is less than a preset pH threshold.

[0015] To achieve the above-mentioned purpose, the second aspect of the embodiment of the present invention proposes a transformer oil status monitoring device, including: a first acquisition module, used to obtain oil parameter information of the transformer; a second acquisition module, used to obtain environmental parameter information of the transformer; a first determination module, used to determine the oil level change of the transformer according to the oil parameter information and the environmental parameter information; a second determination module, used to determine the status of the transformer oil according to the oil parameter information when the oil level change meets the preset conditions.

[0016] To achieve the above objectives, a third aspect of the present invention provides a computer-readable storage medium on which a transformer oil status monitoring program is stored. When the transformer oil status monitoring program is executed by a processor, the aforementioned transformer oil status monitoring method is implemented.

[0017] To achieve the above-mentioned purpose, the fourth aspect of the embodiment of the present invention proposes a transformer, including a memory, a processor, and a transformer oil status monitoring program stored in the memory and executable on the processor. When the processor executes the transformer oil status monitoring program, the aforementioned transformer oil status monitoring method is implemented.

[0018] According to the transformer and its oil status monitoring method, device and storage medium of the embodiment of the present invention, the oil parameter information of the transformer and the environmental parameter information of the transformer are obtained; the oil level change of the transformer is determined according to the oil parameter information and the environmental parameter information; when the oil level change meets the preset conditions, the state of the transformer oil is determined according to the oil parameter information. The oil status monitoring method of the present invention can monitor the state of the transformer oil by obtaining the oil parameter information of the transformer and the environmental parameter information of the transformer, so that safety accidents caused by abnormal transformer oil state can be avoided to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a flow chart of a transformer oil condition monitoring method according to some embodiments of the present invention;

[0020] Figure 2 A block diagram of an oil condition monitoring device for a transformer according to some embodiments of the present invention;

[0021] Figure 3 is a block diagram of a transformer according to some embodiments of the present invention. DETAILED DESCRIPTION

[0022] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0023] The transformer and its oil condition monitoring method, device and storage medium according to the embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0024] Figure 1 FIG. 1 is a flow chart of a transformer oil condition monitoring method according to some embodiments of the present invention. Figure 1 The transformer oil condition monitoring method of the embodiment of the present application may include the following steps:

[0025] S110, obtaining oil parameter information of the transformer and environmental parameter information of the transformer.

[0026] Specifically, the oil parameter information of the transformer may include the oil temperature of the transformer, and the environmental parameter information of the transformer may include the ambient temperature and the ambient air pressure, wherein the oil temperature can be determined jointly based on the load of the transformer and the ambient temperature, the ambient temperature can be obtained by detecting a temperature sensor arranged outside the transformer, and the ambient air pressure can be obtained by detecting an air pressure sensor arranged outside the transformer.

[0027] S120: Determine the oil level change of the transformer according to the oil parameter information and the environmental parameter information.

[0028] Specifically, the oil level change of the transformer can be determined based on the oil temperature, ambient temperature and ambient pressure. For example, the corresponding relationship between the oil temperature under the current ambient temperature and ambient pressure is recorded, and the corresponding oil level is obtained. The oil level change of the transformer can be determined by taking the difference between the oil level before and after the oil temperature is increased or decreased by a unit temperature (for example, 1°C). For example, assuming that the oil temperature under the current ambient temperature and ambient pressure is x°C, the corresponding oil level is y cm, and when the oil temperature rises to x+1°C, the corresponding oil level is z cm, then the oil level change of the transformer can be determined to be zy cm.

[0029] S130: When the oil level change satisfies a preset condition, determine the state of the transformer oil according to the oil parameter information.

[0030] Specifically, if the amount of oil level change that increases or decreases within a unit temperature meets the preset conditions, such as the amount of oil level change is within a preset range, the state of the transformer oil can be determined based on the oil parameter information (such as the oil level), for example, to determine whether there is a risk of transformer oil overflow when the transformer is in a full-load state, or to determine whether there is a risk of transformer oil shortage when the transformer is in an unloaded state. If the amount of oil level change that increases or decreases within a unit temperature does not meet the preset conditions, for example, the amount of oil level change is not within the preset range, it means that there may be gas impurities in the oil, which poses a safety risk, and the transformer can be controlled to issue an early warning.

[0031] The oil status monitoring method of the present invention can monitor the status of transformer oil by acquiring oil parameter information of the transformer and environmental parameter information of the transformer, thus avoiding safety accidents caused by abnormal transformer oil status to a certain extent.

[0032] In some embodiments, the oil parameter information may include oil temperature, and the environmental parameter information may include ambient temperature and ambient air pressure. Determining the oil level change of the transformer based on the oil parameter information and the environmental parameter information includes: obtaining the correspondence between the oil temperature under the current ambient temperature and ambient air pressure; and determining the oil level change of the transformer based on the oil temperature correspondence.

[0033] Specifically, factors such as changes in the internal temperature of the transformer, changes in load, transformer oil quality, changes in ambient temperature, and changes in ambient air pressure will affect the oil level of the transformer. For example, an increase in the transformer load and an increase in the ambient temperature will cause the internal temperature of the transformer to rise; a decrease in the transformer load and a decrease in ambient temperature will cause the internal temperature of the transformer to decrease. When the internal temperature of the transformer increases, the expansion coefficient of the transformer oil will increase, causing the oil level to rise; conversely, when the internal temperature of the transformer decreases, the expansion coefficient of the transformer oil will decrease, causing the oil level to drop. For another example, when the quality of the oil is unqualified or aged, the viscosity of the oil will change, thereby affecting the expansion coefficient of the oil and causing changes in the oil level. For another example, when the ambient air pressure drops, the expansion coefficient of the oil will also decrease accordingly, causing the oil level to drop; conversely, when the ambient air pressure rises, the expansion coefficient of the oil will also increase accordingly, causing the oil level to rise.

[0034] Therefore, based on the influencing factors of the transformer oil level and the historical transformer oil level change data set, a machine learning algorithm or a deep learning algorithm is used to train the transformer oil level analysis model, wherein the historical transformer oil level change data set includes input variables and corresponding output variables. In an embodiment of the present invention, the input variables are ambient temperature, ambient air pressure, and oil temperature data under the current ambient temperature and ambient air pressure, and the corresponding output variable is the oil level change of the transformer.

[0035] For example, under the current ambient temperature and ambient pressure, the oil temperature of the transformer is obtained to form a corresponding relationship between the oil temperature under the current ambient temperature and ambient pressure. The ambient temperature, ambient pressure and corresponding oil temperature data are input into the transformer oil level analysis model for calculation, so as to determine the change in oil level that increases or decreases within unit temperature.

[0036] In some embodiments, the oil parameter information may include oil temperature, the environmental parameter information may include ambient temperature, and obtaining the oil parameter information of the transformer includes: obtaining the transformer load; and determining the oil temperature according to the transformer load and the ambient temperature.

[0037] Specifically, factors such as ambient temperature, transformer load, oil pump operation, and oil level will affect the transformer oil temperature. Among them, ambient temperature will directly affect the heat dissipation effect of the transformer, and then affect the transformer oil temperature. For example, in summer, when the temperature is high, the heat dissipation effect of the transformer is poor, and the transformer oil temperature will also increase accordingly, which is prone to overheating. The load size of the transformer will also affect the transformer oil temperature. When the transformer load increases, the current and power inside the transformer will increase accordingly, thereby generating heat and causing the oil temperature to rise. The oil pump plays a vital role in the oil circulation inside the transformer. When the pumping speed of the oil pump cannot meet the oil circulation requirements inside the transformer, it will cause the oil circulation to be poor, thereby affecting the heat dissipation effect of the transformer and causing the oil temperature to rise. The oil inside the transformer should maintain a certain oil level. When the oil level is too low, the heat inside the transformer is not easy to dissipate, increasing the transformer oil temperature. When the oil level is too high, the oil inside the transformer will produce steam, which will affect the normal operation of the transformer.

[0038] Therefore, based on the influencing factors of the transformer oil temperature and the historical transformer oil temperature data set, a machine learning algorithm or a deep learning algorithm is used to train the transformer oil temperature calculation model, wherein the historical transformer oil temperature data set includes input variables and corresponding output variables. In an embodiment of the present invention, the input variables are the transformer load and the ambient temperature, and the corresponding output variable is the oil temperature of the transformer.

[0039] Exemplarily, the transformer load and the ambient temperature are input into the oil temperature calculation model for calculation, and the output of the oil temperature calculation model is the oil temperature of the transformer. The transformer load can be obtained by reading the reading of the load indicator set on the transformer.

[0040] It should be noted that the standard oil temperature corresponding to the current ambient temperature and transformer load can be obtained by querying a two-dimensional mapping table between the ambient temperature, transformer load and oil temperature based on the ambient temperature and transformer load. The two-dimensional mapping table includes multiple ambient temperature data and transformer load data and the standard oil temperature corresponding to each ambient temperature data and transformer load data. If the oil temperature of the transformer output after the current transformer load and ambient temperature are input into the oil temperature calculation model is significantly higher than the standard oil temperature, it means that the heat dissipation component of the transformer is likely to be abnormal, and the transformer will issue an early warning.

[0041] In some embodiments, the oil level change satisfies a preset condition, including: when the oil level change is within a preset range, determining that the oil level change satisfies the preset condition. The preset range is calibrated according to actual conditions and is not specifically limited here.

[0042] For example, assuming that the preset range of the oil level change is greater than or equal to -1 cm and less than or equal to 1 cm, if the oil level change within a unit temperature is 2 cm (the oil level rises by 2 cm) or -2 cm (the oil level drops by 2 cm), it is determined that the oil level change does not meet the preset condition. If the oil level change within a unit temperature is 0.5 cm (the oil level rises by 0.5 cm) or -0.5 cm (the oil level drops by 0.5 cm), it is determined that the oil level change meets the preset condition.

[0043] In some embodiments, the oil parameter information may include the oil level, and the state of the transformer oil is determined according to the oil parameter information, including: when the transformer is in a fully loaded state, if the oil level is greater than a first preset oil level threshold, then the transformer oil state is determined to be at risk of overflow; when the transformer is in an unloaded state, if the oil level is less than a second preset oil level threshold, then the transformer oil state is determined to be at risk of insufficient oil. The first preset oil level threshold is greater than the second preset oil level threshold, and the first preset oil level threshold and the second preset oil level threshold can be calibrated according to actual conditions, and no specific restrictions are made here.

[0044] Specifically, the oil parameter information may also include the oil level, which can be detected by an ultrasonic sensor installed on the transformer. If the oil level is too high, when the transformer is fully loaded, oil will overflow. If the oil level rises abnormally to the top of the oil pillow, the pressure relief valve of the transformer will overflow, causing the transformer to trip or even damage. If the oil level is too low, when the transformer is running at no-load, it will cause discharge in the high-voltage bushing, causing an accident. If there is a serious lack of oil, the internal iron core coil of the transformer will be exposed to the air, and it is easy for the insulation to be damp and cause lead discharge and insulation breakdown accidents. Therefore, when the transformer is in a fully loaded state, the oil level can be compared with the first preset oil level threshold to determine whether there is a risk of transformer oil overflow. When the transformer is in an unloaded state, the oil level can be compared with the second preset oil level threshold to determine whether there is a risk of transformer oil shortage.

[0045] Exemplarily, when the transformer is in a fully loaded state, if the oil level is less than or equal to the first preset oil level threshold, it is determined that there is no risk of transformer oil overflow; if the oil level is greater than the first preset oil level threshold, it is determined that there is a risk of transformer oil overflow. At this time, the operator can be reminded to check whether the oil level is too high due to excessive refueling or abnormal temperature rise of the cooler, and take corresponding oil draining measures to restore the normal oil level, but the oil level should be controlled to correspond to the current oil temperature. When the transformer is in an unloaded state, if the oil level is greater than or equal to the second preset oil level threshold, it is determined that there is no risk of transformer oil shortage; if the oil level is less than the second preset oil level threshold, it is determined that there is a risk of transformer oil shortage. At this time, the operator can be reminded to check whether the oil level is too low due to oil leakage or sudden load changes, and take corresponding oil replenishment measures to restore the normal oil level.

[0046] In this way, when the transformer oil level is determined to be too high or too low by monitoring the oil parameter information, the operator is reminded to take corresponding measures to restore the normal oil level, which can avoid safety accidents caused by too high or too low transformer oil to a certain extent.

[0047] In some embodiments, the oil parameter information may include oil temperature, and obtaining the oil level of the transformer includes: obtaining the initial oil level by ultrasonic means; and correcting the initial oil level according to the oil temperature and the inclination angle of the transformer to obtain the oil level of the transformer.

[0048] Specifically, the initial oil level can be obtained by detecting an ultrasonic sensor installed on the transformer. When the ultrasonic wave propagates through the transformer wall in the oil and gas of the transformer, it is reflected at the interface. The height of the transformer oil, i.e., the initial oil level of the transformer, is calculated based on the time difference between the solid-liquid and gas interfaces and the propagation speed in the transformer oil. However, the oil temperature of the transformer will affect the propagation speed of the ultrasonic wave, resulting in inaccurate transformer oil level measurement. For example, the higher the oil temperature, the lower the corresponding ultrasonic wave propagation speed, which will result in a higher transformer oil level measurement result. In addition, the transformer may have a certain inclination angle relative to the horizontal plane, which can be detected and obtained by the inclination angle sensor installed on the transformer. When the inclination angle is too large, it will also lead to inaccurate transformer oil level measurement, for example, resulting in a lower transformer oil level measurement result.

[0049] Therefore, it is necessary to correct the initial oil level according to the oil temperature and the tilt angle of the transformer. For example, a first compensation coefficient is determined according to the oil temperature, and a second compensation coefficient is determined according to the tilt angle of the transformer. The first compensation coefficient and the second compensation coefficient are used to correct the initial oil level to obtain the accurate oil level of the transformer.

[0050] In some embodiments, the initial oil level is corrected according to the oil temperature and the inclination angle of the transformer, including: determining a first compensation coefficient according to the oil temperature; determining a first oil level of the transformer according to the initial oil level and the first compensation coefficient; determining a second compensation coefficient according to the inclination angle when the inclination angle of the transformer exceeds a preset angle threshold; determining a second oil level of the transformer according to the initial oil level and the second compensation coefficient; determining the oil level of the transformer according to the first oil level and the second oil level. The preset angle threshold can be calibrated according to actual conditions, and no specific limitation is made here.

[0051] Specifically, the first compensation coefficient can be obtained based on the current oil temperature by querying a one-dimensional mapping table between the oil temperature and the first compensation coefficient, wherein the one-dimensional mapping table includes a plurality of oil temperature data and a first compensation coefficient corresponding to each oil temperature data. The first compensation coefficient corresponding to the standard oil temperature is 1. When the oil temperature is greater than the standard oil temperature, the first compensation coefficient is less than 1, and the higher the oil temperature, the smaller the corresponding first compensation coefficient. When the oil temperature is less than the standard oil temperature, the first compensation coefficient is greater than 1, and the lower the oil temperature, the larger the corresponding first compensation coefficient. Exemplarily, the first compensation coefficient is obtained according to the current oil temperature, and the first compensation coefficient is multiplied by the initial oil level to obtain the first oil level of the transformer. In this way, the oil level is negatively compensated when the oil temperature is high, and the oil level is positively compensated when the oil temperature is low.

[0052] Specifically, the second compensation coefficient can be obtained based on the inclination angle of the transformer by querying a one-dimensional mapping table between the inclination angle of the transformer and the second compensation coefficient. The one-dimensional mapping table includes a plurality of inclination angle data and a second compensation coefficient corresponding to each inclination angle data. When the inclination angle of the transformer does not exceed the preset angle threshold, the corresponding second compensation coefficient is 1. When the inclination angle of the transformer exceeds the preset angle threshold, the second compensation coefficient is greater than 1, and the larger the inclination angle, the larger the corresponding second compensation coefficient. Exemplarily, the second compensation coefficient is determined according to the inclination angle of the transformer, and the second oil level of the transformer is obtained by multiplying the second compensation coefficient by the initial oil level. In this way, the oil level is positively compensated when the inclination angle of the transformer exceeds the preset angle threshold.

[0053] It should be noted that the tilt angle of the transformer cannot exceed the limited tilt angle. Generally speaking, the size of the limited tilt angle is related to the rated capacity of the transformer. For a small transformer, the limited tilt angle is 3 degrees, and for a large transformer, the limited tilt angle is 1.5 degrees. This can ensure that the oil plane is uniform when the transformer is running, and the transformer oil can circulate normally inside the transformer without uneven oil immersion. The stability and safe operation of the transformer can be guaranteed to a certain extent. Correspondingly, the size of the preset angle threshold is also related to the rated capacity of the transformer. For example, for a small transformer, the preset angle threshold can be 1.5 degrees, and for a large transformer, the preset angle threshold can be 0.5 degrees. The preset angle threshold can be calibrated according to actual conditions, and no specific restrictions are made here.

[0054] Specifically, the oil level of the transformer is determined according to the first oil level and the second oil level. Exemplarily, the formula for determining the oil level of the transformer by setting the weight coefficient α is as follows:

[0055] Transformer oil level = first oil level × α + second oil level × (1-α)

[0056] The weight coefficient α is calibrated according to the actual situation and is not specifically limited here.

[0057] In this way, the initial oil level can be corrected according to the oil temperature and the tilt angle of the transformer, which can improve the accuracy of oil level measurement.

[0058] In some embodiments, the oil parameter information may include: oil temperature, humidity and water-soluble acid. The state of the transformer oil is determined based on the oil parameter information, including: determining that the transformer oil is aged when any one of the following conditions is met: the oil temperature exceeds a preset temperature threshold, the humidity exceeds a preset humidity threshold, and the water-soluble acid is less than a preset pH threshold.

[0059] Specifically, transformer oil aging will lead to a decrease in transformer insulation performance, increase the risk of insulation breakdown, and produce partial discharge, which will aggravate the aging process and affect the safety of the transformer. Therefore, by real-time monitoring of oil parameter information, such as monitoring oil temperature, humidity and water-soluble acid, and judging whether at least one of the oil temperature, humidity and water-soluble acid meets the aging judgment condition, it is determined whether the transformer oil is aged. For example, if the oil temperature meets the aging judgment condition, it is determined that the transformer oil is aged, and the transformer oil needs to be replaced at this time; otherwise, the transformer oil does not need to be replaced. Among them, the oil temperature can be calculated and obtained through the oil temperature calculation model, and the humidity and water-soluble acid can be obtained by real-time detection according to the online monitoring system. The specific acquisition method is not limited here.

[0060] Exemplarily, the starting temperature of transformer oil oxidation is 60°C to 70°C. When the transformer oil temperature reaches 90°C to 100°C, its oxidation and deterioration degree intensify. Therefore, if the oil temperature of the transformer oil exceeds the preset temperature threshold, for example, the oil temperature exceeds 90°C, it is determined that the transformer oil is aged. The high humidity of the transformer oil indicates that the transformer oil may be invaded by water, thereby causing the aging degree of the transformer oil to intensify. Therefore, if the humidity of the transformer oil exceeds the preset humidity threshold, for example, the humidity exceeds 50%, it is determined that the transformer oil is aged. A high water-soluble acid value usually indicates that the transformer oil contains more acidic substances, for example, the transformer oil contains oil oxidation or foreign matter, thereby causing the aging degree of the transformer oil to intensify. Therefore, if the water-soluble acid of the transformer oil is less than the preset pH threshold, for example, the water-soluble acid (PH value) is less than 4.2, it is determined that the transformer oil is aged.

[0061] It should be noted that a machine learning algorithm or a deep learning algorithm can be used to train a transformer oil aging model based on a historical transformer oil aging data set and aging judgment conditions, wherein the historical transformer oil aging data set includes input variables and corresponding output variables. In an embodiment of the present invention, the input variables are oil temperature, humidity, and water-soluble acid, and the corresponding output variable is the oil aging judgment result. Exemplarily, one or more of the oil temperature, humidity, and water-soluble acid are input into the transformer oil aging model, and the output of the transformer oil aging model is the oil aging judgment result, for example, the judgment result is aging or not aging.

[0062] In this way, when the transformer oil is determined to be aged by monitoring the oil parameter information, the transformer oil is replaced, which can avoid safety accidents caused by the aging of the transformer oil to a certain extent.

[0063] In summary, by acquiring the oil parameter information of the transformer and the environmental parameter information of the transformer to monitor the oil level status and oil aging status of the transformer oil, safety accidents caused by excessively high transformer oil level, excessively low oil level and transformer oil aging can be avoided to a certain extent.

[0064] Corresponding to the above embodiment, the present application also proposes a transformer oil status monitoring device.

[0065] Reference Figure 2 The transformer oil state monitoring device 200 includes: a first acquisition module 210, a second acquisition module 220, a first determination module 230 and a second determination module 240.

[0066] Among them, the first acquisition module 210 is used to obtain the oil parameter information of the transformer; the second acquisition module 220 is used to obtain the environmental parameter information of the transformer; the first determination module 230 is used to determine the oil level change of the transformer according to the oil parameter information and the environmental parameter information; the second determination module 240 is used to determine the state of the transformer oil according to the oil parameter information when the oil level change meets the preset conditions.

[0067] According to one embodiment of the present invention, when the oil parameter information includes oil temperature and the environmental parameter information includes ambient temperature and ambient air pressure, the first determination module 230 is specifically used to obtain the corresponding relationship between the oil temperature under the current ambient temperature and ambient air pressure; and determine the oil level change of the transformer according to the corresponding relationship between the oil temperature.

[0068] According to an embodiment of the present invention, when the oil parameter information includes oil temperature and the environmental parameter information includes ambient temperature, the first acquisition module 210 is specifically used to acquire the transformer load; and determine the oil temperature according to the transformer load and the ambient temperature.

[0069] According to an embodiment of the present invention, the second determination module 240 is specifically configured to determine whether the oil level change satisfies a preset condition when the oil level change is within a preset range.

[0070] According to one embodiment of the present invention, when the oil parameter information includes the oil level, the second determination module 240 is specifically used to, when the transformer is in a full-load state, if the oil level is greater than a first preset oil level threshold, determine that the state of the transformer oil is at risk of overflow; when the transformer is in a no-load state, if the oil level is less than a second preset oil level threshold, determine that the state of the transformer oil is at risk of insufficient.

[0071] According to an embodiment of the present invention, when the oil parameter information includes oil temperature, the first acquisition module 210 is specifically used to obtain the initial oil level by ultrasonic means; and correct the initial oil level according to the oil temperature and the inclination angle of the transformer to obtain the oil level of the transformer.

[0072] According to one embodiment of the present invention, the first acquisition module 210 is also used to determine a first compensation coefficient based on the oil temperature; determine a first oil level of the transformer based on the initial oil level and the first compensation coefficient; when the inclination angle of the transformer exceeds a preset angle threshold, determine a second compensation coefficient based on the inclination angle; determine the second oil level of the transformer based on the initial oil level and the second compensation coefficient; and determine the oil level of the transformer based on the first oil level and the second oil level.

[0073] According to one embodiment of the present invention, when the oil parameter information includes: oil temperature, humidity and water-soluble acid, the second determination module 240 is also used to determine the aging of the transformer oil when any one of the following conditions is met: the oil temperature exceeds a preset temperature threshold, the humidity exceeds a preset humidity threshold, and the water-soluble acid is less than a preset pH threshold.

[0074] It should be pointed out that the above explanation of the embodiment and beneficial effects of the transformer oil condition monitoring method is also applicable to the transformer oil condition monitoring device of the embodiment of the present invention, and will not be elaborated here in detail to avoid redundancy.

[0075] Corresponding to the above embodiments, the present application also proposes a computer-readable storage medium.

[0076] The computer-readable storage medium of the present application stores a transformer oil status monitoring program thereon, and the transformer oil status monitoring program implements the aforementioned transformer oil status monitoring method when executed by a processor.

[0077] It should be noted that the above-mentioned explanation of the embodiment and beneficial effects of the method for monitoring the oil condition of a transformer is also applicable to the computer-readable storage medium of the embodiment of the present invention, and will not be elaborated here in detail to avoid redundancy.

[0078] Corresponding to the above embodiment, the present application also proposes a transformer.

[0079] See also Figure 3 As shown, the transformer 300 of the present application includes a memory 310, a processor 320, and a transformer oil status monitoring program stored in the memory 310 and executable on the processor 320. When the processor 320 executes the transformer oil status monitoring program, the aforementioned transformer oil status monitoring method is implemented.

[0080] It should be pointed out that the above-mentioned explanation of the embodiment and beneficial effects of the method for monitoring the oil condition of a transformer is also applicable to the transformer of the embodiment of the present invention, and will not be elaborated here in detail to avoid redundancy.

[0081] It should be noted that the logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be specifically implemented in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purposes of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection portion with one or more wirings (electronic device), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing in other suitable ways if necessary, and then stored in a computer memory.

[0082] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0083] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0084] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0085] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0086] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A method for monitoring oil condition of a transformer, characterized in that: The method comprises: Obtaining oil parameter information of the transformer and environmental parameter information of the transformer; Determining an oil level change of the transformer according to the oil parameter information and the environmental parameter information; When the oil level change satisfies a preset condition, the state of the transformer oil is determined according to the oil parameter information.

2. The transformer oil condition monitoring method according to claim 1, characterized in that: The oil parameter information includes oil temperature, the environmental parameter information includes ambient temperature and ambient air pressure, and determining the oil level change of the transformer according to the oil parameter information and the environmental parameter information includes: Obtaining the corresponding relationship between the current ambient temperature and the oil temperature under the ambient pressure; The oil level change of the transformer is determined according to the oil temperature correspondence.

3. The transformer oil condition monitoring method according to claim 1, characterized in that: The oil parameter information includes oil temperature, the environmental parameter information includes environmental temperature, and obtaining the oil parameter information of the transformer includes: Get transformer load; The oil temperature is determined according to the transformer load and the ambient temperature.

4. The transformer oil condition monitoring method according to claim 1, characterized in that: The oil level change meets the preset conditions, including: When the oil level change is within a preset range, it is determined that the oil level change satisfies a preset condition.

5. The method for monitoring the oil condition of a transformer according to any one of claims 1 to 4, characterized in that: The oil parameter information includes an oil level, and determining the state of the transformer oil according to the oil parameter information includes: When the transformer is in a fully loaded state, if the oil level is greater than a first preset oil level threshold, determining that the transformer oil is in a state of overflow risk; When the transformer is in a no-load state, if the oil level is less than a second preset oil level threshold, it is determined that the transformer oil is at risk of being insufficient.

6. The transformer oil condition monitoring method according to claim 5, characterized in that: The oil parameter information includes oil temperature, and obtaining the oil level of the transformer includes: Obtain the initial oil level by ultrasonic method; The initial oil level is corrected according to the oil temperature and the inclination angle of the transformer to obtain the oil level of the transformer.

7. The transformer oil condition monitoring method according to claim 6, characterized in that: Correcting the initial oil level according to the oil temperature and the inclination angle of the transformer includes: determining a first compensation coefficient according to the oil temperature; determining a first oil level of the transformer according to the initial oil level and the first compensation coefficient; When the tilt angle of the transformer exceeds a preset angle threshold, determining a second compensation coefficient according to the tilt angle; determining a second oil level of the transformer according to the initial oil level and the second compensation coefficient; The oil level of the transformer is determined according to the first oil level and the second oil level.

8. The method for monitoring transformer oil condition according to any one of claims 1 to 4, characterized in that: The oil parameter information includes: oil temperature, humidity and water-soluble acid. Determining the state of transformer oil according to the oil parameter information includes: When any one of the following conditions is met: the oil temperature exceeds a preset temperature threshold, the humidity exceeds a preset humidity threshold, and the water-soluble acid is less than a preset pH threshold, it is determined that the transformer oil is aged.

9. A transformer oil condition monitoring device, characterized in that: include: A first acquisition module is used to acquire oil parameter information of the transformer; A second acquisition module is used to acquire environmental parameter information of the transformer; A first determination module, configured to determine an oil level change of the transformer according to the oil parameter information and the environmental parameter information; The second determination module is used to determine the state of the transformer oil according to the oil parameter information when the oil level change meets a preset condition.

10. A computer-readable storage medium, characterized in that: A transformer oil condition monitoring program is stored thereon, and when the transformer oil condition monitoring program is executed by a processor, a transformer oil condition monitoring method according to any one of claims 1-8 is implemented.

11. A transformer, characterized in that: The invention comprises a memory, a processor and a transformer oil condition monitoring program stored in the memory and executable on the processor. When the processor executes the transformer oil condition monitoring program, the transformer oil condition monitoring method according to any one of claims 1 to 10 is implemented.

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