Pressure correction method and device for equilibrium constant of dissolved gas, medium and equipment

Abstract

The invention relates to the technical field of power equipment state monitoring, and discloses a pressure correction method and device for a dissolved gas equilibrium constant, a medium and equipment.The method comprises the steps that a liquid-phase reference chemical potential and a gas-phase reference chemical potential under standard atmospheric pressure are obtained, and the liquid-phase chemical potential and the gas-phase chemical potential of dissolved gas are established in combination with preset parameters; when the liquid-phase chemical potential is equal to the gas-phase chemical potential, constructing a chemical potential balance equation; and constructing target equilibrium constants under different air pressure conditions based on the dissolution concentration and the gas phase partial pressure, determining a reference equilibrium constant under the standard atmospheric pressure, and substituting the target equilibrium constants and the reference equilibrium constant into the chemical potential equilibrium equation to obtain a correction coefficient of the target equilibrium constants relative to the reference equilibrium constant. According to the method, the calculation accuracy of the component content of the dissolved gas in the transformer oil under different air pressure environment factors is improved, and the evaluation accuracy of the running state of the transformer is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of power equipment status monitoring, and in particular to a method, device, medium and equipment for correcting the pressure of a dissolved gas equilibrium constant. Background Art

[0002] Power transformers are crucial components in power systems, and their stable and safe operation has a direct impact on ensuring the reliability and security of the entire power grid. When a transformer fault occurs, such as partial discharge, overheating, or arcing, the insulating oil decomposes and produces a series of characteristic gases, such as hydrogen, methane, and acetylene. By monitoring changes in the composition of these gases dissolved in the oil, early warning and accurate diagnosis of potential equipment failures can be achieved.

[0003] However, traditional dissolved gas analysis (DGA) technology is highly dependent on specific environmental conditions for the accuracy of measurement data, and is particularly affected by atmospheric pressure. This makes the measurement data obtained in different environments inaccurate, and thus makes it impossible to accurately assess the transformer status. Summary of the Invention

[0004] In view of this, the present application provides a pressure correction method, device, medium and equipment for the dissolved gas equilibrium constant, the main purpose of which is to solve the technical problem that the accuracy of measurement data obtained by traditional dissolved gas analysis technology is greatly affected by gas pressure, resulting in low accuracy of the obtained measurement data.

[0005] According to a first aspect of the present invention, a method for pressure correction of a dissolved gas equilibrium constant is provided, the method comprising:

[0006] Acquiring a liquid phase reference chemical potential under standard atmospheric pressure, and establishing a liquid phase chemical potential of the dissolved gas based on the liquid phase reference chemical potential and a plurality of first preset parameters, wherein the first preset parameters include a dissolved concentration of the dissolved gas;

[0007] Acquiring a gas phase reference chemical potential under standard atmospheric pressure, and establishing a gas phase chemical potential of the dissolved gas based on the gas phase reference chemical potential and a plurality of second preset parameters, wherein the second preset parameters include a gas partial pressure of the dissolved gas;

[0008] When the liquid phase chemical potential is equal to the gas phase chemical potential, constructing a chemical potential balance equation;

[0009] A target equilibrium constant is constructed based on the dissolved concentration and the gas phase partial pressure, and a reference equilibrium constant under standard atmospheric pressure is determined according to the target equilibrium constant. The target equilibrium constant and the reference equilibrium constant are substituted into the chemical potential equilibrium equation to obtain a correction coefficient of the target equilibrium constant relative to the reference equilibrium constant, wherein the target equilibrium constant is the equilibrium constant of the dissolved gas under different gas pressure conditions.

[0010] Optionally, the first preset parameters further include an ideal gas constant, an absolute temperature, an activity coefficient, a partial molar volume of the dissolved gas, a current external total gas pressure, and a standard atmospheric pressure; and the expression for the liquid phase chemical potential is:

[0011] μ liguid =μ0 liguid +RTlnγC+v m (P-P0)

[0012] Where μ liguid is the liquid chemical potential, μ0 liguid is the liquid phase reference chemical potential, R is the ideal gas constant, T is the absolute temperature, γ is the activity coefficient, C is the dissolved gas concentration, v m is the partial molar volume of the dissolved gas, P is the current external total air pressure, and P0 is the standard atmospheric pressure.

[0013] Optionally, the second preset parameters further include an ideal gas constant, absolute temperature, and standard atmospheric pressure; the expression of the gas phase chemical potential is:

[0014]

[0015] Where μ gas is the gas phase chemical potential, μ0 gas is the gas phase reference chemical potential, R is the ideal gas constant, T is the absolute temperature, P gas is the gas phase partial pressure of dissolved gas, and P0 is the standard atmospheric pressure.

[0016] Optionally, the expression for the gas partial pressure of the dissolved gas is:

[0017] P gas =yP

[0018] Where y is the gas phase mole fraction.

[0019] Optionally, the expression of the target equilibrium constant is:

[0020]

[0021] Where, P is the current external total air pressure, C is the dissolved concentration, P gas is the gas phase partial pressure of the dissolved gas.

[0022]

[0023] Where K0 is the reference equilibrium constant, lnK0 is the natural logarithm of the reference equilibrium constant, μ gas is the gas phase chemical potential, μ0 gas is the gas phase reference chemical potential, R is the ideal gas constant, T is the absolute temperature, P0 is the standard atmospheric pressure, and lnP0 is the natural logarithm of the standard atmospheric pressure.

[0024] Optionally, the correction coefficient is expressed as:

[0025]

[0026] Where, v m is the partial molar volume of the dissolved gas.

[0027] According to a second aspect of the present invention, there is provided a pressure correction device for a dissolved gas equilibrium constant, the device comprising:

[0028] a liquid phase chemical potential establishing module, configured to obtain a liquid phase reference chemical potential under standard atmospheric pressure, and establish a liquid phase chemical potential of the dissolved gas based on the liquid phase reference chemical potential and a plurality of first preset parameters, wherein the first preset parameters include the dissolved concentration of the dissolved gas;

[0029] a gas phase chemical potential establishing module, configured to obtain a gas phase reference chemical potential under standard atmospheric pressure, and establish the gas phase chemical potential of the dissolved gas based on the gas phase reference chemical potential and a plurality of second preset parameters, wherein the second preset parameters include the gas partial pressure of the dissolved gas;

[0030] a chemical potential balance equation building module, configured to build a chemical potential balance equation when the liquid phase chemical potential is equal to the gas phase chemical potential;

[0031] A correction coefficient calculation module is used to construct a target equilibrium constant based on the dissolved concentration and the gas phase partial pressure, and determine a reference equilibrium constant under standard atmospheric pressure based on the target equilibrium constant, substitute the target equilibrium constant and the reference equilibrium constant into the chemical potential equilibrium equation to obtain a correction coefficient of the target equilibrium constant relative to the reference equilibrium constant, wherein the target equilibrium constant is the equilibrium constant of the dissolved gas under different gas pressure conditions.

[0032] According to a third aspect of the present invention, a storage medium is provided, on which a computer program is stored, and when the program is executed by a processor, the above-mentioned pressure correction method for the dissolved gas equilibrium constant is implemented.

[0033] According to a fourth aspect of the present invention, a computer device is provided, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the above-mentioned pressure correction method for the dissolved gas equilibrium constant when executing the program.

[0034] The present invention provides a pressure correction method, device, medium and equipment for the dissolved gas equilibrium constant. By obtaining the reference chemical potential of the liquid and gas phases under standard atmospheric pressure and establishing corresponding liquid and gas phase chemical potential models in combination with parameters such as dissolved concentration and gas partial pressure, it ensures that the true chemical potential state of the dissolved gas can be accurately calculated under different environmental conditions. On the basis of constructing the chemical potential equilibrium equation, the equilibrium constant of the dissolved gas can also be dynamically adjusted according to different external conditions, which not only solves the problem of measurement result deviation of traditional DGA technology under different atmospheric pressures, but also enables the accurate dissolved gas component content to be obtained under any given atmospheric conditions. Based on the corrected target equilibrium constant, the evaluation of the transformer operating status can be more accurate, further improving the reliability of transformer health monitoring.

[0035] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0037] Figure 1 A schematic flow chart showing a method for correcting the pressure of a dissolved gas equilibrium constant provided by an embodiment of the present invention is shown;

[0038] Figure 2 A schematic structural diagram of a pressure correction device for a dissolved gas equilibrium constant provided by an embodiment of the present invention is shown;

[0039] Figure 3 A schematic diagram of the structure of a computer device provided by an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0040] The following describes exemplary embodiments of the present application in more detail with reference to the accompanying drawings. Although exemplary embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present application and to fully convey the scope of the present application to those skilled in the art.

[0041] The embodiment of the present application provides a method for correcting the pressure of the dissolved gas equilibrium constant, such as Figure 1 As shown, the method includes the following steps:

[0042] 101. Obtain a liquid phase reference chemical potential under standard atmospheric pressure, and establish a liquid phase chemical potential of the dissolved gas based on the liquid phase reference chemical potential and a plurality of first preset parameters, wherein the first preset parameters include a dissolved concentration of the dissolved gas.

[0043] Among them, liquid phase chemical potential is an important concept in thermodynamics, which refers to the change in free energy of a component in the liquid phase under certain temperature and pressure conditions. Specifically, the liquid phase chemical potential describes the change in the Gibbs free energy of the system when a substance transfers from one phase to another; the liquid phase reference chemical potential refers to the liquid phase reference chemical potential of dissolved gas in transformer oil under standard atmospheric pressure conditions. Once the liquid phase reference chemical potential is used as a benchmark, this benchmark can be used in combination with specific parameters under actual operating conditions to calculate the liquid phase chemical potential under specific circumstances to reflect the impact of these changes on the chemical potential of the dissolved gas.

[0044] In the embodiment of the present application, the error caused by different gas pressure conditions can be accurately adjusted. By accurately calculating the liquid phase chemical potential, the actual concentration of the dissolved gas can be measured more accurately, which is crucial for evaluating the internal state of the transformer and has a relatively wide range of applications.

[0045] 102. Obtain a gas phase reference chemical potential under standard atmospheric pressure, and establish a gas phase chemical potential of the dissolved gas based on the gas phase reference chemical potential and a plurality of second preset parameters, wherein the second preset parameters include a gas partial pressure of the dissolved gas.

[0046] Among them, gas-phase chemical potential is also an important concept in thermodynamics, which refers to the change in free energy of a component in the gas phase under specific temperature and pressure conditions; the gas-phase reference chemical potential is the reference chemical potential of the dissolved gas in its gas phase under standard atmospheric pressure conditions. It is a basic value derived from experimental data or literature and is used for subsequent calculations.

[0047] In the embodiment of the present application, similar to establishing the liquid phase chemical potential in step 101, by precisely adjusting the gas phase chemical potential to reflect the influence of the actual gas partial pressure, the actual concentration of the dissolved gas can be calculated more accurately, which is crucial for evaluating the internal state of the transformer and also has a relatively wide range of applications.

[0048] 103. When the chemical potential of the liquid phase is equal to the chemical potential of the gas phase, construct the chemical potential equilibrium equation.

[0049] Among them, when the chemical potential of the liquid phase is equal to the chemical potential of the gas phase, constructing the chemical potential equilibrium equation means that in a closed system, when the transfer of a dissolved gas between the liquid phase and the gas phase reaches a dynamic equilibrium state, the chemical potential of the component in the two phases is equal. This principle is based on the second law of thermodynamics, that is, in a state of equilibrium, substances tend to diffuse from areas of high chemical potential to areas of low chemical potential until the chemical potential of the substance in each phase reaches equilibrium.

[0050] In the embodiment of the present application, by ensuring the balance of the chemical potential of the liquid phase and the gas phase, the actual concentration of the dissolved gas under actual conditions can be more accurately reflected, and the accurate chemical potential balance equation helps to better understand the physical and chemical processes occurring inside the transformer.

[0051] 104. Construct a target equilibrium constant based on the dissolved concentration and the gas phase partial pressure, and determine the reference equilibrium constant under standard atmospheric pressure based on the target equilibrium constant. Substitute the target equilibrium constant and the reference equilibrium constant into the chemical potential equilibrium equation to obtain the correction coefficient of the target equilibrium constant relative to the reference equilibrium constant, where the target equilibrium constant is the equilibrium constant of the dissolved gas under different atmospheric pressure conditions.

[0052] Among them, under specific atmospheric pressure conditions, a target equilibrium constant can be constructed based on the dissolved gas concentration and partial pressure in the gas phase obtained from actual measurements, which specifically reflects the distribution of dissolved gas under current conditions. The reference equilibrium constant under standard atmospheric pressure is measured or calculated under known standard atmospheric pressure conditions, and represents the behavior of dissolved gas under ideal conditions. When the liquid phase chemical potential is equal to the gas phase chemical potential, that is, the system is in equilibrium, this relationship can be expressed by the chemical potential equilibrium equation. Combining the above two equilibrium constants, an equation can be established to reflect the relationship between them, and finally a correction coefficient is obtained to quantify the deviation caused by changes in atmospheric pressure, and then the measurement results can be adjusted to more accurately reflect the dissolved gas concentration under real conditions.

[0053] In the embodiment of the present application, the error caused by the change of the ambient pressure can be effectively corrected, and accurate results can be provided under different air pressure environments. Accurate dissolved gas concentration data is crucial for the early detection of potential problems inside the transformer.

[0054] The present invention provides a pressure correction method, device, medium and equipment for the dissolved gas equilibrium constant. By obtaining the reference chemical potential of the liquid and gas phases under standard atmospheric pressure and establishing corresponding liquid and gas phase chemical potential models in combination with parameters such as dissolved concentration and gas partial pressure, it ensures that the true chemical potential state of the dissolved gas can be accurately calculated under different environmental conditions. On the basis of constructing the chemical potential equilibrium equation, the equilibrium constant of the dissolved gas can also be dynamically adjusted according to different external conditions, which not only solves the problem of measurement result deviation of traditional DGA technology under different atmospheric pressures, but also enables the accurate dissolved gas component content to be obtained under any given atmospheric conditions. Based on the corrected target equilibrium constant, the evaluation of the transformer operating status can be more accurate, further improving the reliability of transformer health monitoring.

[0055] In the above embodiment, it is first necessary to explain the mechanism of the influence of atmospheric pressure on the equilibrium constant of dissolved gas in transformer oil, which is specifically divided into two situations: high-pressure environment and low-pressure environment. Under high-pressure environment, the chemical potential of gas molecules in oil will increase. In order to maintain the chemical potential balance between the oil phase and the gas phase, more gas needs to be dissolved in the oil, which in turn causes the equilibrium constant to be greater than the equilibrium constant under the reference state. As the equilibrium constant increases, the solubility of the gas also increases. Under low-pressure environment, the gas dissolved in the oil is more likely to escape into the gas phase, resulting in the equilibrium constant being less than the equilibrium constant under the reference state. As the equilibrium constant decreases, the solubility of the gas also decreases.

[0056] Furthermore, the expression of liquid phase chemical potential is established as:

[0057] μ liguid =μ0 liguia +RTlnγC+v m (P-P0)

[0058] Where μ liguid is the liquid chemical potential, μ0 liguid is the liquid phase reference chemical potential, R is the ideal gas constant, T is the absolute temperature, γ is the activity coefficient, C is the dissolved gas concentration, v m is the partial molar volume of the dissolved gas, P is the current external total pressure, P0 is the standard atmospheric pressure, and the activity coefficient is assumed to be 1;

[0059] And the expression for establishing the gas phase chemical potential is:

[0060]

[0061] Where μ gas is the gas phase chemical potential, μ0 gas is the gas phase reference chemical potential, R is the ideal gas constant, T is the absolute temperature, P gasis the gas phase partial pressure of dissolved gas, P0 is the standard atmospheric pressure;

[0062] Among them, the expression of the gas partial pressure of the dissolved gas is:

[0063] P gas =yP

[0064] Where y is the gas phase mole fraction;

[0065] Furthermore, when the system reaches equilibrium, the chemical potential of the liquid phase is equal to the chemical potential of the gas phase, that is,

[0066] μl i gi u d=μ gas

[0067] Then the chemical potential balance equation is established:

[0068]

[0069] Furthermore, the equilibrium constant is defined as the ratio of the dissolved concentration to the gas phase partial pressure, and the expression of the target equilibrium constant is:

[0070]

[0071] Where, P is the current external total air pressure, C is the dissolved concentration, P gas is the gas phase partial pressure of the dissolved gas;

[0072]

[0073] At the same time, let the reference equilibrium constant under standard atmospheric pressure be K0, then the expression of the reference equilibrium constant is:

[0074] Where K0 is the reference equilibrium constant, lnK0 is the natural logarithm of the reference equilibrium constant, μ0 gas is the gas phase reference chemical potential, μ0 liguid is the liquid phase reference chemical potential, R is the ideal gas constant, T is the absolute temperature, P0 is the standard atmospheric pressure, and lnP0 is the natural logarithm of the standard atmospheric pressure.

[0075] Substituting the reference equilibrium parameters into the chemical potential equilibrium equation, we can obtain the relationship between the target equilibrium constant and the reference equilibrium constant:

[0076]

[0077] A pressure correction method for a dissolved gas equilibrium constant provided in an embodiment of the present application is used to correct the measured concentration of hydrogen in transformer oil at high altitudes:

[0078] Specifically, the transformer is located at an altitude of 3000 meters, the current air pressure is 70kPa, the standard atmospheric pressure is 101.3kPa, and the partial molar volume of the dissolved gas is Temperature T = 298K, ideal gas constant is 8.314J / (mol·k), then based on the relationship between the target equilibrium constant and the reference equilibrium constant

[0079] Then the target equilibrium constant is obtained as:

[0080]

[0081] Further, as Figure 1 The specific implementation of the method, the embodiment of the present application provides a pressure correction device for the dissolved gas equilibrium constant, such as Figure 2 As shown, the device includes: a liquid phase chemical potential establishment module 301, a gas phase chemical potential establishment module 302, a chemical potential balance equation establishment module 303 and a correction coefficient calculation module 304.

[0082] a liquid phase chemical potential establishing module 301, configured to obtain a liquid phase reference chemical potential at standard atmospheric pressure, and establish a liquid phase chemical potential of the dissolved gas based on the liquid phase reference chemical potential and a plurality of first preset parameters, wherein the first preset parameters include a dissolved concentration of the dissolved gas;

[0083] a gas phase chemical potential establishing module 302, configured to obtain a gas phase reference chemical potential at standard atmospheric pressure, and establish a gas phase chemical potential of the dissolved gas based on the gas phase reference chemical potential and a plurality of second preset parameters, wherein the second preset parameters include a gas partial pressure of the dissolved gas;

[0084] A chemical potential balance equation building module 303 is used to build a chemical potential balance equation when the liquid phase chemical potential is equal to the gas phase chemical potential;

[0085] The correction coefficient calculation module 304 is used to construct a target equilibrium constant based on the dissolved concentration and the gas phase partial pressure, and determine the reference equilibrium constant under standard atmospheric pressure based on the target equilibrium constant. The target equilibrium constant and the reference equilibrium constant are substituted into the chemical potential equilibrium equation to obtain the correction coefficient of the target equilibrium constant relative to the reference equilibrium constant, wherein the target equilibrium constant is the equilibrium constant of the dissolved gas under different atmospheric pressure conditions.

[0086] In a specific application scenario, in the liquid phase chemical potential establishment module 301, the first preset parameters also include the ideal gas constant, absolute temperature, activity coefficient, partial molar volume of dissolved gas, current external total pressure, and standard atmospheric pressure; the expression of the liquid phase chemical potential is:

[0087] μ liguid =μ0 liguid +RTlnγC+vm (P-P0)

[0088] Where μ liguid is the liquid chemical potential, μ0 liguid is the liquid phase reference chemical potential, R is the ideal gas constant, T is the absolute temperature, γ is the activity coefficient, C is the dissolved gas concentration, v m is the partial molar volume of the dissolved gas, P is the current external total air pressure, and P0 is the standard atmospheric pressure.

[0089] In a specific application scenario, in the gas phase chemical potential establishing module 302, the second preset parameters also include the ideal gas constant, absolute temperature and standard atmospheric pressure; the expression of the gas phase chemical potential is:

[0090]

[0091] Where μ gas is the gas phase chemical potential, μ0 gas is the gas phase reference chemical potential, R is the ideal gas constant, T is the absolute temperature, P gas is the gas phase partial pressure of dissolved gas, and P0 is the standard atmospheric pressure.

[0092] In a specific application scenario, in the gas phase chemical potential establishment module 302, the expression of the gas partial pressure of the dissolved gas is:

[0093] P gas =yP

[0094] Where y is the gas phase mole fraction.

[0095] In a specific application scenario, in the correction coefficient calculation module 304, the expression of the target equilibrium constant is:

[0096]

[0097] Where P is the current external total pressure, C is the dissolved concentration, and P gas is the gas phase partial pressure of the dissolved gas.

[0098] In a specific application scenario, in the correction coefficient calculation module 304, the expression of the reference equilibrium constant is:

[0099]

[0100] Where K0 is the reference equilibrium constant, lnK0 is the natural logarithm of the reference equilibrium constant, μ0 gas is the gas phase reference chemical potential, μ0 liguid is the liquid phase reference chemical potential, R is the ideal gas constant, T is the absolute temperature, P0 is the standard atmospheric pressure, and lnP0 is the natural logarithm of the standard atmospheric pressure.

[0101] In a specific application scenario, the correction coefficient is expressed as:

[0102]

[0103] Where, v m is the partial molar volume of the dissolved gas.

[0104] It should be noted that for other corresponding descriptions of the functional units involved in the pressure correction device for dissolved gas equilibrium constant provided in this embodiment, please refer to Figure 1 The corresponding description in will not be repeated here.

[0105] Based on the above Figure 1 The method shown, accordingly, this embodiment also provides a storage medium, which stores a computer program, and when the program is executed by a processor, it implements the pressure correction method of the dissolved gas equilibrium constant.

[0106] Based on this understanding, the technical solution of the present application can be embodied in the form of a software product. The software product to be identified can be stored in a non-volatile storage medium (which can be a CD-ROM, USB flash drive, mobile hard disk, etc.), including a number of instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to execute the pressure correction method of the dissolved gas equilibrium constant in each implementation scenario of the present application.

[0107] Based on the above Figure 1 The method shown, and Figure 2 In order to achieve the above-mentioned purpose, the pressure correction device embodiment of the dissolved gas equilibrium constant shown in FIG. Figure 3 As shown, this embodiment also provides a physical device for congestion control, which includes a communication bus, a processor, a memory, and a communication interface. It may also include an input / output interface and a display device. The various functional units can communicate with each other via the bus. The memory stores a computer program, and the processor is configured to execute the program stored in the memory and implement the pressure correction method for the dissolved gas equilibrium constant described in the above embodiment.

[0108] Optionally, the physical device may further include a user interface, a network interface, a camera, a radio frequency (RF) circuit, a sensor, an audio circuit, a Wi-Fi module, etc. The user interface may include a display, an input unit such as a keyboard, etc., and the optional user interface may also include a USB interface, a card reader interface, etc. The network interface may optionally include a standard wired interface, a wireless interface (such as a Wi-Fi interface), etc.

[0109] Those skilled in the art will understand that the congestion control entity device structure provided in this embodiment does not constitute a limitation on the entity device, and may include more or fewer components, or a combination of certain components, or different component arrangements.

[0110] The storage medium may also include an operating system and a network communication module. The operating system is a program that manages the physical device hardware and the software resources to be identified, supporting the execution of the information processing program and other software and / or programs to be identified. The network communication module is used to enable communication between components within the storage medium and with other hardware and software in the physical information processing device.

[0111] Through the description of the above implementation methods, those skilled in the art can clearly understand that the present application can be implemented by means of software plus the necessary general hardware platform, or by hardware. By applying the technical solution of the present application, by obtaining the reference chemical potential of the liquid and gas phases under standard atmospheric pressure, and combining parameters such as dissolved concentration and gas partial pressure to establish corresponding liquid and gas phase chemical potential models, it is ensured that the true chemical potential state of the dissolved gas can be accurately calculated under different environmental conditions; on the basis of constructing the chemical potential equilibrium equation, the equilibrium constant of the dissolved gas can also be dynamically adjusted according to different external conditions, which not only solves the problem of measurement result deviation of the traditional DGA technology under different atmospheric pressures, but also enables the accurate dissolved gas component content to be obtained under any given atmospheric conditions; based on the corrected target equilibrium constant, the evaluation of the transformer operating status can be more accurate, further improving the reliability of transformer health monitoring.

[0112] Those skilled in the art will understand that the accompanying drawings are only schematic diagrams of a preferred implementation scenario, and the modules or processes in the accompanying drawings are not necessarily required to implement the present application. Those skilled in the art will understand that the modules in the devices in the implementation scenario can be distributed in the devices of the implementation scenario according to the implementation scenario description, or can be changed accordingly and located in one or more devices different from the implementation scenario. The modules of the above-mentioned implementation scenario can be combined into one module, or can be further split into multiple sub-modules.

[0113] The serial numbers of the above application are for descriptive purposes only and do not represent the advantages or disadvantages of the implementation scenarios. The above disclosure only discloses several specific implementation scenarios of the present application, but the present application is not limited thereto. Any changes that can be conceived by those skilled in the art should fall within the scope of protection of the present application.

Claims

1. A method for pressure correction of dissolved gas equilibrium constant, characterized in that: The method comprises: Acquiring a liquid phase reference chemical potential under standard atmospheric pressure, and establishing a liquid phase chemical potential of the dissolved gas based on the liquid phase reference chemical potential and a plurality of first preset parameters, wherein the first preset parameters include a dissolved concentration of the dissolved gas; Acquiring a gas phase reference chemical potential under standard atmospheric pressure, and establishing a gas phase chemical potential of the dissolved gas based on the gas phase reference chemical potential and a plurality of second preset parameters, wherein the second preset parameters include a gas partial pressure of the dissolved gas; When the liquid phase chemical potential is equal to the gas phase chemical potential, constructing a chemical potential balance equation; A target equilibrium constant is constructed based on the dissolved concentration and the gas phase partial pressure, and a reference equilibrium constant under standard atmospheric pressure is determined according to the target equilibrium constant. The target equilibrium constant and the reference equilibrium constant are substituted into the chemical potential equilibrium equation to obtain a correction coefficient of the target equilibrium constant relative to the reference equilibrium constant, wherein the target equilibrium constant is the equilibrium constant of the dissolved gas under different gas pressure conditions.

2. The method according to claim 1, characterized in that The first preset parameters also include the ideal gas constant, absolute temperature, activity coefficient, partial molar volume of the dissolved gas, current external total gas pressure and standard atmospheric pressure; the expression of the liquid phase chemical potential is: m liguid =μ0 liguid +RTlnγC+v m (P-P0) Where μ liguid is the liquid chemical potential, μ0 liguid is the liquid phase reference chemical potential, R is the ideal gas constant, T is the absolute temperature, γ is the activity coefficient, C is the dissolved gas concentration, v m is the partial molar volume of the dissolved gas, P is the current external total air pressure, and P0 is the standard atmospheric pressure.

3. The method according to claim 1, characterized in that The second preset parameters also include the ideal gas constant, absolute temperature and standard atmospheric pressure; the expression of the gas phase chemical potential is: Where μ gas is the gas phase chemical potential, μ0 gas is the gas phase reference chemical potential, R is the ideal gas constant, T is the absolute temperature, P gas is the gas phase partial pressure of dissolved gas, and P0 is the standard atmospheric pressure.

4. The method according to claim 3, characterized in that The expression of the gas partial pressure of the dissolved gas is: P gas =yP Where y is the gas phase mole fraction.

5. The method according to claim 1, wherein The expression of the target equilibrium constant is: Where P is the current external total pressure, C is the dissolved concentration of dissolved gas, and P gas is the gas phase partial pressure of the dissolved gas.

6. The method according to claim 5, characterized in that The expression of the reference equilibrium constant is: Where K0 is the reference equilibrium constant, lnK0 is the natural logarithm of the reference equilibrium constant, μ0 gas is the gas phase reference chemical potential, μ0 liguid is the liquid phase reference chemical potential, R is the ideal gas constant, T is the absolute temperature, P0 is the standard atmospheric pressure, and lnP0 is the natural logarithm of the standard atmospheric pressure.

7. The method according to claim 6, characterized in that The expression of the correction coefficient is: Where, v m is the partial molar volume of the dissolved gas.

8. A pressure correction device for dissolved gas equilibrium constant, characterized in that: The device comprises: a liquid phase chemical potential establishing module, configured to obtain a liquid phase reference chemical potential under standard atmospheric pressure, and establish a liquid phase chemical potential of the dissolved gas based on the liquid phase reference chemical potential and a plurality of first preset parameters, wherein the first preset parameters include the dissolved concentration of the dissolved gas; a gas phase chemical potential establishing module, configured to obtain a gas phase reference chemical potential under standard atmospheric pressure, and establish the gas phase chemical potential of the dissolved gas based on the gas phase reference chemical potential and a plurality of second preset parameters, wherein the second preset parameters include the gas partial pressure of the dissolved gas; a chemical potential balance equation building module, configured to build a chemical potential balance equation when the liquid phase chemical potential is equal to the gas phase chemical potential; A correction coefficient calculation module is used to construct a target equilibrium constant based on the dissolved concentration and the gas phase partial pressure, and determine a reference equilibrium constant under standard atmospheric pressure based on the target equilibrium constant, substitute the target equilibrium constant and the reference equilibrium constant into the chemical potential equilibrium equation to obtain a correction coefficient of the target equilibrium constant relative to the reference equilibrium constant, wherein the target equilibrium constant is the equilibrium constant of the dissolved gas under different gas pressure conditions.

9. A storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

10. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

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