Transformer oil tank pressure monitoring method, system and device and readable storage medium

Abstract

The invention discloses a method, a system and a device for monitoring the pressure of a transformer oil tank and a readable storage medium. Wherein the internal and external environment data comprises the oil temperature in the transformer oil tank, the environment temperature of the environment where the transformer oil tank is located and the atmospheric pressure value of the environment where the transformer oil tank is located, calculating the internal and external temperature difference of the transformer oil tank according to the oil temperature and the environment temperature, and calculating the relative air pressure value of the transformer oil tank according to the internal and external temperature difference and the atmospheric pressure value; and comparing the relative pressure value with a preset threshold value, and sending feedback information to the monitoring platform according to a comparison result. A pressure sensor does not need to be arranged in the transformer oil tank or at a pressure cover of the transformer oil tank to monitor the pressure in the transformer oil tank, interference of the pressure sensor and external signals is avoided, and the reliability and accuracy of the monitoring system are improved.

Description

Technical Field

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

[0002] Oil-immersed transformer is a type of transformer, a device that changes AC voltage through the principle of electromagnetic induction. Compared with other transformers, oil-immersed transformer is a transformer that dissipates heat through transformer oil. Since the volume of transformer oil inside the transformer will expand or contract with changes in temperature, this directly affects the pressure inside the oil tank. In addition, changes in external ambient temperature will also affect the pressure inside the oil tank.

[0003] At present, the pressure in the transformer oil tank is mainly monitored by installing a pressure sensor at the pressure cover. However, this method does not start from the mechanism of transformer oil tank pressure formation. This method is easily interfered by the transformer oil tank pressure sensor itself and external signals, and has poor reliability and low accuracy.

[0004] The above contents are only used to assist in understanding the technical solution of the present invention and do not constitute an admission that the above contents are prior art. Summary of the invention

[0005] The main purpose of the present invention is to provide a method, system, device and readable storage medium for monitoring transformer oil tank pressure, so as to solve the problem that the current transformer oil tank monitoring method has poor reliability and low accuracy.

[0006] To achieve the above object, the present invention provides a method for monitoring transformer oil tank pressure, the method comprising:

[0007] Acquire internal and external environmental data of the transformer oil tank, wherein the internal and external environmental data include the oil temperature inside the transformer oil tank, the ambient temperature of the environment where the transformer oil tank is located, and the atmospheric pressure value of the environment where the transformer oil tank is located;

[0008] Calculating the temperature difference between the inside and outside of the transformer oil tank according to the oil temperature and the ambient temperature;

[0009] Calculating the relative air pressure value of the transformer oil tank according to the internal and external temperature difference and the atmospheric pressure value;

[0010] The relative pressure value is compared with a preset threshold value, and feedback information is sent to the monitoring platform according to the comparison result.

[0011] Furthermore, the step of calculating the relative air pressure value of the transformer oil tank according to the internal and external temperature difference and the atmospheric pressure value comprises:

[0012] Obtaining a preset standard atmospheric pressure and a first preset formula;

[0013] The relative air pressure value is calculated using the first preset formula according to the internal and external temperature difference, the atmospheric pressure value, and the standard atmospheric pressure.

[0014] Furthermore, the first preset formula is: 相对 =k1t 温差 +(P A –P G ), where P 相对 is the relative pressure value, k1 is a constant, P A is the atmospheric pressure value, the P G is the standard atmospheric pressure, t 温差 is the internal and external temperature difference.

[0015] Furthermore, the transformer includes an oil pump, an oil guide pipe, a cooling device, and a filter, and the transformer oil tank pressure monitoring method further includes:

[0016] If the comparison result is that the relative pressure value is greater than the preset threshold value, controlling the oil pump to extract part of the oil from the transformer oil tank into the cooling device;

[0017] The cooling device is controlled to cool the extracted part of the oil, wherein the extracted part of the oil is filtered by the filter and then re-enters the transformer oil tank through the oil guide pipe.

[0018] Furthermore, the transformer oil tank further comprises a flow control valve, and is characterized in that the transformer oil tank pressure monitoring method further comprises:

[0019] Obtaining a preset initial flow value, and adjusting the flow control valve to an initial valve opening according to the initial flow value;

[0020] The relative air pressure value is acquired in real time, and the valve opening of the flow control valve is adjusted according to the relative air pressure value.

[0021] Further, adjusting the valve opening of the flow control valve according to the relative air pressure value includes:

[0022] According to the relative air pressure value, the valve opening of the flow control valve is adjusted using a second preset formula, where the second preset formula is K v =k2P 相对 +b, where the K v is the valve opening of the flow control valve, k2 is a constant, P 相对 is the relative air pressure value, and b is the initial valve opening.

[0023] Further, the internal and external environmental data include the oil temperature inside the transformer oil tank, and the obtaining of the internal and external environmental data of the transformer oil tank includes:

[0024] Obtain the primary current on the primary side, the secondary current on the secondary side, the primary voltage on the primary side, and the secondary voltage on the secondary side of the transformer;

[0025] Calculating the loss of the transformer, and calculating the oil temperature using a third preset formula;

[0026] Wherein, the third preset formula is: t 内 is the oil temperature, I1 is the primary current, I2 is the secondary current, R1 is the primary resistance of the primary side of the transformer, R2 is the secondary resistance of the secondary side of the transformer, C is the specific heat capacity of the transformer oil, m is the mass of the transformer oil, t 初 is the initial temperature of transformer oil, P 铁 is the iron loss of the transformer.

[0027] In addition, to achieve the above object, the present invention also provides a transformer oil tank pressure monitoring system, comprising:

[0028] An acquisition module is used to acquire internal and external environmental data of the transformer oil tank, wherein the internal and external environmental data include the oil temperature inside the transformer oil tank, the ambient temperature of the environment where the transformer oil tank is located, and the atmospheric pressure value of the environment where the transformer oil tank is located;

[0029] A calculation module, used to calculate the internal and external temperature difference of the transformer oil tank according to the internal oil temperature and the ambient temperature, and to calculate the relative air pressure value of the transformer oil tank according to the internal and external temperature difference and the atmospheric pressure value;

[0030] The information feedback module is used to compare the relative pressure value with a preset threshold value and send feedback information to the monitoring platform according to the comparison result.

[0031] In addition, to achieve the above-mentioned purpose, the present invention also provides a monitoring device for a transformer oil tank pressure, the monitoring device for the transformer oil tank pressure comprising: a memory, a processor, and a monitoring program for the transformer oil tank pressure stored in the memory and executable on the processor, the monitoring program for the transformer oil tank pressure implementing the steps of the monitoring method for the transformer oil tank pressure as described above when executed by the processor.

[0032] In addition, to achieve the above-mentioned purpose, the present invention also provides a readable storage medium, on which a transformer oil tank pressure monitoring program is stored. When the transformer oil tank pressure monitoring program is executed by a processor, the steps of the transformer oil tank pressure monitoring method as described above are implemented.

[0033] The present application obtains the internal and external environmental data of the transformer oil tank, wherein the internal and external environmental data include the oil temperature inside the transformer oil tank, the ambient temperature of the environment in which the transformer oil tank is located, and the atmospheric pressure value of the environment in which the transformer oil tank is located, and calculates the internal and external temperature difference of the transformer oil tank according to the oil temperature and the ambient temperature, and then calculates the relative air pressure value of the transformer oil tank according to the internal and external temperature difference and the atmospheric pressure value, compares the relative pressure value with a preset threshold value, and sends feedback information to the monitoring platform according to the comparison result. The present application does not need to set a pressure sensor inside the transformer oil tank or at the pressure cover of the transformer oil tank to monitor the pressure in the transformer oil tank, avoids interference between the pressure sensor itself and external signals, and improves the reliability and accuracy of the monitoring system. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A schematic flow chart of an embodiment of a method for monitoring transformer oil tank pressure according to the present invention;

[0035] Figure 2 A schematic flow chart of another embodiment of a method for monitoring transformer oil tank pressure of the present invention;

[0036] Figure 3 It is a schematic diagram of the transformer oil tank of the present invention.

[0037] In the figure:

[0038] 100, oil tank body; 200, oil pump; 300, cooling device; 400, filter; 500, oil guide pipe; 600, flow control valve; 700, one-way valve.

[0039] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0041] The present invention further provides a method for monitoring transformer oil tank pressure. Figure 1 , Figure 1 The figure is a flow chart of an embodiment of a method for monitoring transformer oil tank pressure of the present invention.

[0042] In this embodiment, the executor of the transformer oil tank pressure monitoring method is a transformer oil tank pressure monitoring system, and the transformer oil tank pressure monitoring system includes a transformer oil tank pressure monitoring device or equipment, and the transformer oil tank pressure monitoring device can be a terminal device such as a PC or a handheld computer. The present invention obtains the internal and external environmental data of the transformer oil tank, wherein the internal and external environmental data include the oil temperature inside the transformer oil tank, the ambient temperature of the environment in which the transformer oil tank is located, and the atmospheric pressure value of the environment in which the transformer oil tank is located, and calculates the internal and external temperature difference of the transformer oil tank according to the oil temperature and the ambient temperature, and then calculates the relative air pressure value of the transformer oil tank according to the internal and external temperature difference and the atmospheric pressure value, compares the relative pressure value with a preset threshold value, and sends feedback information to the monitoring platform according to the comparison result. The steps of the transformer oil tank pressure monitoring method include:

[0043] Step S10, obtaining internal and external environmental data of the transformer oil tank, wherein the internal and external environmental data include the oil temperature inside the transformer oil tank, the ambient temperature of the environment where the transformer oil tank is located, and the atmospheric pressure value of the environment where the transformer oil tank is located;

[0044] In this embodiment, a temperature sensor (such as a PT100 platinum resistance temperature sensor or a thermocouple) may be provided inside the transformer oil tank, and the oil temperature inside the transformer oil tank may be detected by the temperature sensor provided inside the transformer oil tank. A temperature sensor and an air pressure sensor may be provided outside the transformer oil tank or near the transformer, and the ambient temperature of the environment in which the transformer oil tank is located may be detected by the temperature sensor provided outside the transformer oil tank or near the transformer, and the atmospheric pressure value of the environment in which the transformer oil tank is located may be detected by the air pressure sensor provided outside the transformer oil tank or near the transformer.

[0045] In some embodiments, the oil temperature inside the transformer oil tank may also be estimated by an indirect method, for example, estimating the oil temperature inside the transformer oil tank by the load and loss of the transformer.

[0046] Specifically, step S10 includes:

[0047] Step S11, obtaining a primary current on the primary side, a secondary current on the secondary side, a primary voltage on the primary side, and a secondary voltage on the secondary side of the transformer;

[0048] Step S12, calculating the loss of the transformer and calculating the oil temperature using a third preset formula.

[0049] In this embodiment, the third preset formula is: t 内is the oil temperature, I1 is the primary current, I2 is the secondary current, R1 is the primary resistance of the primary side of the transformer, R2 is the secondary resistance of the secondary side of the transformer, C is the specific heat capacity of the transformer oil, m is the mass of the transformer oil, t 初 is the initial temperature of transformer oil, P 铁 is the iron loss of the transformer.

[0050] The primary side of the transformer is the high voltage side of the transformer, and the secondary side of the transformer is the low voltage side of the transformer. The voltage transformer is installed on the busbars on the primary and secondary sides of the transformer, and the output end of the voltage transformer is connected to the voltage input end of the data acquisition module (such as PLC, RTU or data acquisition card) of the monitoring system of the transformer oil tank pressure, so that the primary voltage and secondary voltage of the primary and secondary sides of the transformer are detected through the voltage transformer. The current transformer is installed on the wires on the primary and secondary sides of the transformer, and the output end of the current transformer is connected to the data acquisition module of the monitoring system of the transformer oil tank pressure, so that the primary current and secondary current of the primary and secondary sides of the transformer are detected through the current transformer.

[0051] In some embodiments, the primary current and primary voltage on the primary side of the transformer and the secondary current and secondary voltage on the secondary side of the transformer may also be measured by a smart meter or a handheld test instrument (such as a multimeter or a multi-purpose tester).

[0052] The primary resistance of the primary side of the transformer and the secondary resistance of the secondary side of the transformer are the resistance of the primary winding and the secondary winding of the transformer respectively. The primary resistance and the secondary resistance are usually recorded in the transformer nameplate data or the product manual provided by the transformer manufacturer. After the transformer is manufactured and shipped, the transformer manufacturer will provide the specific values ​​of the primary resistance and the secondary resistance. The transformer monitoring personnel can enter the specific values ​​of the primary resistance and the secondary resistance in the transformer tank pressure monitoring system.

[0053] The specific heat capacity of transformer oil is usually between 0.46 kcal / (kg·℃) and 0.5 kcal / (kg·℃). Due to the different types, purity and measurement conditions of the oil, the specific heat capacity of transformer oil in different transformers is different. After the transformer is manufactured, the transformer manufacturer will provide the specific value of the specific heat capacity of the transformer oil. The transformer monitoring personnel can enter the specific value of the specific heat capacity of the transformer oil in the transformer tank pressure monitoring system.

[0054] The quality of transformer oil can be calculated by the volume of the transformer oil tank and the density of the transformer oil. The copper loss of the transformer is mainly caused by the resistance in the transformer winding. The copper loss is proportional to the square of the load current. Therefore, as the load increases, the copper loss will also increase significantly. The copper loss of the transformer can be calculated by obtaining the primary current, secondary current, primary resistance and secondary resistance of the primary and secondary sides of the transformer. The iron loss of the transformer is mainly caused by the hysteresis loss and eddy current loss in the transformer core. The iron loss of the transformer can be regarded as a constant value. As long as the transformer is energized, the iron loss of the transformer will exist even if there is no load. The iron loss of the transformer is usually recorded in the transformer nameplate data or the product manual provided by the transformer manufacturer.

[0055] The total loss of the transformer can be calculated by the copper loss of the transformer and the iron loss of the transformer, and the temperature of the transformer oil temperature rise can be calculated by the specific heat capacity of the transformer oil and the mass of the transformer oil, and the current temperature of the transformer oil can be calculated by the initial temperature of the transformer oil. The initial temperature of the transformer oil can be the temperature of the oil when the transformer is not working, or the ambient temperature of the current environment where the transformer oil tank is located. The monitoring personnel of the transformer can extract part of the transformer oil before the transformer works, and measure the temperature of the transformer oil in the current environment by using a temperature measuring instrument, or directly use the ambient temperature obtained by detecting the temperature sensor outside the transformer oil tank or near the transformer as the initial temperature of the transformer oil. In this embodiment, the temperature of the oil inside the transformer oil tank is estimated by an indirect method, and there is no need to set a temperature sensor inside the transformer oil tank, thereby avoiding the problem of inaccurate measurement of the temperature inside the oil caused by the failure of the temperature sensor itself.

[0056] Step S20, calculating the temperature difference between the inside and outside of the transformer oil tank according to the oil temperature and the ambient temperature;

[0057] Step S30, calculating the relative air pressure value of the transformer oil tank according to the internal and external temperature difference and the atmospheric pressure value;

[0058] In this embodiment, the transformer will generate more heat and cause the oil temperature to rise when it is overloaded for a long time. According to the oil temperature inside the transformer oil tank and the ambient temperature, the temperature difference between the oil temperature inside the transformer oil tank and the ambient temperature can be calculated, and then the relative air pressure value of the transformer oil tank can be calculated according to the internal and external temperature difference between the inside and outside of the transformer oil tank and the atmospheric pressure value. Among them, the atmospheric pressure value can be obtained by measuring the air pressure value of the current environment of the transformer with a barometer.

[0059] In some embodiments, the calculation may be performed directly based on the atmospheric pressure value of the current environment of the transformer, or the standard atmospheric pressure may be introduced to calculate the difference between the atmospheric pressure value of the current environment of the transformer and the standard atmospheric pressure.

[0060] Specifically, step S30 includes:

[0061] Step S21, obtaining a preset standard atmospheric pressure and a first preset formula;

[0062] Step S22, calculating the relative air pressure value using the first preset formula according to the internal and external temperature difference, the atmospheric pressure value, and the standard atmospheric pressure.

[0063] In this embodiment, the first preset formula is: 相对 =k1t 温差 +(P A –P G ), where P 相对 is the relative pressure value, k1 is a constant, P A is the atmospheric pressure value, the P G is standard atmospheric pressure, t 温差 is the temperature difference between inside and outside. Among them, k1 can be obtained through experiments, which represents the pressure change corresponding to each degree Celsius temperature difference change, k1t 温差 It reflects the effect of temperature change on the internal pressure of the oil tank. 温差 When the pressure increases, the pressure inside the fuel tank will also increase accordingly. A The relative pressure value P can be obtained by measuring the current air pressure of the transformer with a barometer. The standard atmospheric pressure is usually 1013.25 hPa or 1 standard atmospheric pressure. 相对 It is the pressure value above the transformer oil tank pressure cover. (P A –P G ) reflects the actual atmospheric pressure P A With standard atmospheric pressure P G By introducing this correction term, the change in actual atmospheric pressure can be taken into account, making the calculation result more accurate.

[0064] Step S40, comparing the relative pressure value with a preset threshold, and sending feedback information to a monitoring platform according to the comparison result.

[0065] In this embodiment, the preset threshold oil monitoring platform staff is set in the transformer oil tank pressure monitoring system, and the preset threshold can be a specific value or a numerical range. For example, the preset threshold can be 1.5 bar, or the preset threshold is 1.2 bar to 1.5 bar. The comparison result includes that the relative pressure value of the transformer oil tank is less than the preset threshold, the relative pressure value of the transformer oil tank is equal to the preset threshold, and the relative pressure value of the transformer is greater than the preset threshold. If the preset threshold is a numerical range, the relative pressure value of the transformer oil tank is less than the preset threshold, which can be understood as the relative pressure value of the transformer oil tank is less than the numerical value within the numerical range; the relative pressure value of the transformer oil tank is equal to the preset threshold, which can be understood as the relative pressure value of the transformer oil tank is within the numerical range; the relative pressure value of the transformer oil tank is greater than the preset threshold, which can be understood as the relative pressure value of the transformer oil tank is greater than the numerical value within the numerical range.

[0066] The monitoring platform can be a cloud platform or a terminal such as a computer or a mobile phone. The feedback information can be information including comparison results or warning information generated based on the comparison results. Transformer monitoring personnel can view the specific data or working status of the transformer oil tank in real time on the monitoring platform.

[0067] The present application obtains the internal and external environmental data of the transformer oil tank, wherein the internal and external environmental data include the oil temperature inside the transformer oil tank, the ambient temperature of the environment in which the transformer oil tank is located, and the atmospheric pressure value of the environment in which the transformer oil tank is located, and calculates the internal and external temperature difference of the transformer oil tank according to the oil temperature and the ambient temperature, and then calculates the relative air pressure value of the transformer oil tank according to the internal and external temperature difference and the atmospheric pressure value, compares the relative pressure value with the preset threshold value, and sends feedback information to the monitoring platform according to the comparison result. The present application does not need to set a pressure sensor inside the transformer oil tank or at the pressure cover of the transformer oil tank to monitor the pressure in the transformer oil tank, avoids interference between the pressure sensor itself and external signals, and improves the reliability and accuracy of the monitoring system.

[0068] Based on the first embodiment, a second embodiment of the transformer oil tank pressure monitoring method of the present invention is proposed. Figure 2 As shown, the above transformer oil tank pressure monitoring method also includes:

[0069] Step S50, if the comparison result is that the relative pressure value is greater than the preset threshold, controlling the oil pump 200 to extract part of the oil from the transformer oil tank into the cooling device 300;

[0070] Step S60, controlling the cooling device 300 to cool the extracted part of the oil, wherein the extracted part of the oil is filtered by the filter 400 and then re-enters the transformer oil tank through the oil guide pipe 500.

[0071] Reference Figure 3 , Figure 3 Schematic diagram of the structure of the transformer oil tank in this embodiment.

[0072] In this embodiment, the transformer oil tank includes an oil pump 200, an oil guide pipe 500, a cooling device 300, and a filter 400, wherein the oil pump 200 is connected to the oil tank body 100 of the transformer oil tank and communicated with the inside of the transformer oil tank, and is used to extract the transformer oil in the transformer oil tank. The oil pump 200 can be connected to the oil pump 200 through the oil guide pipe 500; the oil guide pipe 500 is used to sequentially connect a first connecting port (not shown) of the oil tank body 100 of the transformer oil tank, the oil pump 200, the cooling device 300, the filter 400, and a second connecting port (not shown) of the oil tank body 100, thereby forming a cooling and pressure reduction circuit. If it is detected that the relative pressure value of the transformer oil tank is greater than a preset threshold, the oil pump 200 is controlled to extract part of the oil in the oil tank body 100 of the transformer oil tank, and the extracted part of the oil is cooled by the cooling device 300 and filtered by the filter 400 in turn before re-entering the transformer oil tank, wherein the cooling device 300 can be an air-cooled radiator or a cooling tower, and the filter 400 is mainly used to filter impurities and moisture in the transformer oil to ensure that the oil is clean.

[0073] In some embodiments, the transformer oil tank further includes a flow control valve 600, which can be disposed on the oil guide pipe 500 between the oil tank body 100 and the oil pump 200. Since the liquid level of the transformer oil in the transformer oil tank cannot be too low, otherwise it will affect the normal operation of the transformer, the amount of transformer oil extracted by the oil pump 200 can be controlled by setting the flow control valve 600.

[0074] The flow control valve 600 has an initial flow value, which is set by the transformer staff. The initial flow value is used to control the flow control valve 600 to adjust to the valve opening corresponding to the initial flow value when it is necessary to extract part of the oil inside the transformer tank through the oil pump 200, so as to extract part of the oil at the first time and reduce the pressure inside the transformer tank in time. In addition, the monitoring system of the transformer tank pressure will obtain the relative air pressure value of the transformer tank in real time, adjust the valve opening of the flow control valve 600 according to the relative air pressure value, thereby adjusting the valve opening of the flow control valve 600 in real time, and then adjusting the pressure inside the transformer tank to a normal range.

[0075] In some embodiments, the valve opening of the flow control valve 600 can be adjusted using a second preset formula, and the second preset formula is K v =k2P 相对 +b, where K v is the valve opening of the flow control valve 600, k2 is a constant, P 相对is the relative air pressure value, b is the initial valve opening. k2 can be set to a specific value through experiments. The initial valve opening is the valve opening adjusted by the staff after the flow control valve 600 is installed. The transformer staff can input k2 and b into the monitoring system of the transformer oil tank pressure.

[0076] In some embodiments, the transformer oil tank further includes a one-way valve 700, which can be disposed on the oil guide pipe 500 between the cooling device 300 and the filter 400. The one-way valve 700 effectively prevents the cooled oil from flowing back to the cooling device 300.

[0077] In this embodiment, part of the oil in the transformer oil tank is extracted by the oil pump 200, and the extracted part of the oil is cooled by the cooling device 300. The cooled transformer oil will re-enter the transformer oil tank, thereby quickly reducing the oil temperature in the transformer oil tank, and then reducing the pressure in the transformer oil tank, thereby avoiding abnormal operation or even explosion of the transformer due to excessive pressure inside the transformer oil tank.

[0078] In addition, an embodiment of the present invention further provides a transformer oil tank pressure monitoring system, the transformer oil tank pressure monitoring system comprising:

[0079] An acquisition module is used to acquire internal and external environmental data of the transformer oil tank, wherein the internal and external environmental data include the oil temperature inside the transformer oil tank, the ambient temperature of the environment where the transformer oil tank is located, and the atmospheric pressure value of the environment where the transformer oil tank is located;

[0080] A calculation module, used to calculate the internal and external temperature difference of the transformer oil tank according to the internal oil temperature and the ambient temperature, and to calculate the relative air pressure value of the transformer oil tank according to the internal and external temperature difference and the atmospheric pressure value;

[0081] The information feedback module is used to compare the relative pressure value with a preset threshold value and send feedback information to the monitoring platform according to the comparison result.

[0082] In addition, an embodiment of the present invention also provides a transformer oil tank pressure monitoring device, which includes: a memory, a processor, and a transformer oil tank pressure monitoring program stored in the memory and executable on the processor. When the transformer oil tank pressure monitoring program is executed by the processor, the steps of the above-mentioned transformer oil tank pressure monitoring method are implemented.

[0083] In addition, this embodiment also provides a readable storage medium, characterized in that a transformer oil tank pressure monitoring program is stored on the readable storage medium, and when the transformer oil tank pressure monitoring program is executed by the processor, the above-mentioned transformer oil tank pressure monitoring method steps are implemented.

[0084] The processor and the memory may be connected via a bus or other means.

[0085] The memory, as a non-transient computer-readable storage medium, can be used to store non-transient software programs and non-transient computer executable programs. In addition, the memory may include a high-speed random access memory, and may also include a non-transient memory, such as at least one disk storage device, a flash memory device, or other non-transient solid-state storage device. In some embodiments, the memory may optionally include a memory remotely disposed relative to the processor, and these remote memories may be connected to the processor via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0086] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or system. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or system including the element.

[0087] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0088] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes a number of instructions for a terminal device (which can be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the methods described in each embodiment of the present invention.

[0089] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A method for monitoring transformer oil tank pressure, characterized in that: The transformer oil tank pressure monitoring method comprises: Acquire internal and external environmental data of the transformer oil tank, wherein the internal and external environmental data include the oil temperature inside the transformer oil tank, the ambient temperature of the environment where the transformer oil tank is located, and the atmospheric pressure value of the environment where the transformer oil tank is located; Calculating the temperature difference between the inside and outside of the transformer oil tank according to the oil temperature and the ambient temperature; Calculating the relative air pressure value of the transformer oil tank according to the internal and external temperature difference and the atmospheric pressure value; The relative pressure value is compared with a preset threshold value, and feedback information is sent to the monitoring platform according to the comparison result.

2. The method for monitoring transformer oil tank pressure according to claim 1, characterized in that: The step of calculating the relative air pressure value of the transformer oil tank according to the internal and external temperature difference and the atmospheric pressure value comprises: Obtaining a preset standard atmospheric pressure and a first preset formula; The relative air pressure value is calculated using the first preset formula according to the internal and external temperature difference, the atmospheric pressure value, and the standard atmospheric pressure.

3. The method for monitoring transformer oil tank pressure according to claim 2, characterized in that: The first preset formula is: 相对 =k1t 温差 +(P A –P G ), where P 相对 is the relative pressure value, k1 is a constant, P A is the atmospheric pressure value, the P G is the standard atmospheric pressure, t 温差 is the internal and external temperature difference.

4. The method for monitoring transformer oil tank pressure according to claim 1, characterized in that: The transformer includes an oil pump, an oil guide pipe, a cooling device, and a filter. The transformer oil tank pressure monitoring method also includes: If the comparison result is that the relative pressure value is greater than the preset threshold value, controlling the oil pump to extract part of the oil from the transformer oil tank into the cooling device; The cooling device is controlled to cool the extracted part of the oil, wherein the extracted part of the oil is filtered by the filter and then re-enters the transformer oil tank through the oil guide pipe.

5. The method for monitoring transformer oil tank pressure according to claim 4, wherein the transformer oil tank further comprises a flow control valve, characterized in that: The transformer oil tank pressure monitoring method further includes: Obtaining a preset initial flow value, and adjusting the flow control valve to an initial valve opening according to the initial flow value; The relative air pressure value is acquired in real time, and the valve opening of the flow control valve is adjusted according to the relative air pressure value.

6. The method for monitoring transformer oil tank pressure according to claim 5, characterized in that: The step of adjusting the valve opening of the flow control valve according to the relative air pressure value comprises: According to the relative air pressure value, the valve opening of the flow control valve is adjusted using a second preset formula, where the second preset formula is K v =k2P 相对 +b, where the K v is the valve opening of the flow control valve, k2 is a constant, P 相对 is the relative air pressure value, and b is the initial valve opening.

7. The method for monitoring transformer oil tank pressure according to claim 5, characterized in that: The internal and external environmental data include the oil temperature inside the transformer oil tank, and the step of obtaining the internal and external environmental data of the transformer oil tank includes: Obtain the primary current on the primary side, the secondary current on the secondary side, the primary voltage on the primary side, and the secondary voltage on the secondary side of the transformer; Calculating the loss of the transformer, and calculating the oil temperature using a third preset formula; Wherein, the third preset formula is: t 内 is the oil temperature, I1 is the primary current, I2 is the secondary current, R1 is the primary resistance of the primary side of the transformer, R2 is the secondary resistance of the secondary side of the transformer, C is the specific heat capacity of the transformer oil, m is the mass of the transformer oil, t 初 is the initial temperature of transformer oil, P 铁 is the iron loss of the transformer.

8. A transformer oil tank pressure monitoring system, characterized in that: The transformer tank pressure monitoring system comprises: An acquisition module is used to acquire internal and external environmental data of the transformer oil tank, wherein the internal and external environmental data include the oil temperature inside the transformer oil tank, the ambient temperature of the environment where the transformer oil tank is located, and the atmospheric pressure value of the environment where the transformer oil tank is located; A calculation module, used to calculate the internal and external temperature difference of the transformer oil tank according to the internal oil temperature and the ambient temperature, and to calculate the relative air pressure value of the transformer oil tank according to the internal and external temperature difference and the atmospheric pressure value; The information feedback module is used to compare the relative pressure value with a preset threshold value and send feedback information to the monitoring platform according to the comparison result.

9. A transformer oil tank pressure monitoring device, characterized in that: The transformer oil tank pressure monitoring device comprises: a memory, a processor, and a transformer oil tank pressure monitoring program stored in the memory and executable on the processor. When the transformer oil tank pressure monitoring program is executed by the processor, the steps of the method described in any one of claims 1 to 7 are implemented.

10. A readable storage medium, characterized in that: The readable storage medium stores a transformer oil tank pressure monitoring program, and the transformer oil tank pressure monitoring program, when executed by a processor, implements the steps of the method according to any one of claims 1 to 7.

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