WO2019148766A1

WO2019148766A1 - Method for predicting volume fraction of dissolved gas in oil, and terminal device

Info

Publication number: WO2019148766A1
Application number: PCT/CN2018/093971
Authority: WO
Inventors: 龚雨含; 王崇皓; 孟令一; 马伟宁; 程佳
Original assignee: 华北理工大学
Priority date: 2018-02-02
Filing date: 2018-07-02
Publication date: 2019-08-08
Also published as: KR20200006559A; JP2020521230A; CN108229095A

Abstract

The present solution is applicable to the technical field of dissolved gas monitoring. Provided are a method for predicting the volume fraction of a dissolved gas in oil, and a terminal device. The method comprises: respectively acquiring the volume fractions of a gas component in a gas chamber at a first time point, a second time point and a third time point in a non-equilibrium state; and according to the volume fraction corresponding to the first time point, the volume fraction corresponding to the second time point, the volume fraction corresponding to the third time point, and a volume fraction prediction formula, calculating the volume fraction of the gas component in the gas chamber in an equilibrium state. In the present solution, a final value of the volume fraction of a gas component in a gas chamber in an equilibrium state can be predicted according to the volume fractions, that are collected multiple times, of the gas component in a non-equilibrium state, without measuring the volume fraction of the gas in the gas chamber after waiting for permeation to reach an equilibrium state, thus reducing the time required for measuring the volume fraction of a dissolved gas in oil.

Description

Method for predicting volume fraction of dissolved gas in oil and terminal device

Technical field

The invention belongs to the technical field of dissolved gas monitoring, and in particular relates to a method for predicting the volume fraction of dissolved gases in oil and a terminal device.

Background technique

With the development of the power grid to a high degree of automation and the increasing demand for power supply reliability by the national economy and the people's livelihood, it is urgent to change the current equipment maintenance system. The state maintenance system based on online monitoring and fault diagnosis technology gradually replaces preventive maintenance. The development trend of the system has become inevitable. From the point of view of the importance of the operational reliability of oil-filled power equipment such as transformers and the price of traditional online monitoring devices, the use of online monitoring devices has significant technical and economic advantages, which not only improves the management level of substation operation but also The foundation for the transition from a preventive maintenance system to a predictive maintenance system.

The fault gas of the oil-filled power equipment is dissolved in the insulating oil, and the key technologies in the on-line monitoring of dissolved gases in the oil include oil and gas separation technology and gas quantitative analysis technology. At present, the online monitoring system needs to give the accurate volume fraction of the dissolved gas in the oil after the gas permeation reaches equilibrium. Due to the limitation of the oil and gas separation technology, the time required for the fault gas to reach equilibrium is often longer. For example, Roland Gilbert tested the permeability of Morgan Schaffer's gas collection device GP100 for various fault gases, in which H2 reached equilibrium after 6 h, and C3H8, which required the longest equilibrium time, reached equilibrium after 239.3 h. The remaining gas reached equilibrium within 96h; a new type of oil and gas separation membrane developed by Li Honglei et al. of Tsinghua University, which realized C2H2, C2H4, C2H6, CH4, CO, CO2, H2 in 12h. The balance of faulty gases. However, the time required for the fault gas to reach equilibrium is still long, and it is difficult to meet the real-time demand for on-line monitoring of dissolved gas in oil-filled power equipment.

technical problem

In view of this, the embodiments of the present invention provide a method for predicting the volume fraction of dissolved gases in oil and terminal equipment to solve the problem that the current volume fraction prediction method is difficult to meet the real-time demand for on-line monitoring of dissolved gas in oil-filled power equipment.

Technical solution

A first aspect of an embodiment of the invention provides a method for predicting a volume fraction of dissolved gases in an oil, comprising:

Obtaining a volume fraction of a gas component in the gas chamber at a first time point, a second time point, and a third time point in a non-equilibrium state; wherein an interval between the first time point and the second time point is equal to An interval between the second time point and the third time point; the gas in the gas chamber is separated by a gas separation membrane to dissolve dissolved gas in the oil-filled power equipment oil;

Calculating a volume of a gas component in the gas chamber in an equilibrium state according to a volume fraction corresponding to the first time point, a volume fraction corresponding to the second time point, a volume fraction corresponding to the third time point, and a volume fraction prediction formula fraction.

A second aspect of an embodiment of the present invention provides a predicting apparatus for a dissolved gas volume fraction in an oil, comprising:

Obtaining a module, respectively, for acquiring a volume fraction of a gas component in a gas chamber at a first time point, a second time point, and a third time point in a non-equilibrium state; wherein the first time point and the second time point The interval between the two is equal to the interval between the second time point and the third time point; the gas in the gas chamber is separated by the oil and gas separation membrane to dissolve the dissolved gas in the oil-filled power equipment oil;

a processing module, configured to calculate a balance state in a gas chamber according to a volume fraction corresponding to the first time point, a volume fraction corresponding to the second time point, a volume fraction corresponding to the third time point, and a volume fraction prediction formula The volume fraction of the gas component.

A third aspect of an embodiment of the present invention provides a terminal device including a memory, a processor, and a computer program stored in the memory and operable on the processor, the processor implementing the computer program A method for predicting the volume fraction of dissolved gases in oil in one aspect.

A fourth aspect of an embodiment of the present invention provides a computer readable storage medium storing a computer program that, when executed by a processor, implements a dissolved gas volume fraction in oil in the first aspect method of prediction.

Beneficial effect

Compared with the prior art, the embodiment of the present invention has the beneficial effects of: a volume fraction corresponding to a first time point in a non-equilibrium state, a volume fraction corresponding to a second time point, a volume fraction corresponding to a third time point, and a volume The fractional prediction formula is calculated to predict the volume fraction of the gas components in the gas chamber in equilibrium, thereby predicting the volume fraction of dissolved gases in the oil. The embodiment of the invention can predict the final value of the volume fraction of the gas component in the equilibrium state air chamber according to the volume fraction of the gas component collected in the non-equilibrium state, and does not have to wait for the penetration into the equilibrium state before measuring the gas. The volume fraction of gas in the chamber, thereby reducing the time required to measure the volume fraction of dissolved gases in the oil, and meeting the real-time demand for on-line monitoring of dissolved gases in oil-filled power equipment.

DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the embodiments or the description of the prior art will be briefly described below. It is obvious that the drawings in the following description are only the present invention. For some embodiments, other drawings may be obtained from those of ordinary skill in the art in light of the inventive workability.

1 is a flow chart showing an implementation of a method for predicting a volume fraction of dissolved gases in an oil according to an embodiment of the present invention;

2 is a flow chart showing an implementation of adjusting a preset time interval in a method for predicting a volume fraction of dissolved gases in an oil according to an embodiment of the present invention;

3 is a schematic diagram of a device for predicting a volume fraction of dissolved gas in an oil according to an embodiment of the present invention;

4 is a schematic diagram of a predicted terminal device for a dissolved gas volume fraction in oil according to an embodiment of the present invention.

Embodiments of the invention

In the following description, for purposes of illustration and description However, it will be apparent to those skilled in the art that the present invention may be practiced in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the invention.

In order to explain the technical solution described in the present invention, the following description will be made by way of specific embodiments.

1 is a flow chart for realizing a method for predicting a volume fraction of dissolved gas in an oil according to an embodiment of the present invention, which is described in detail as follows:

In S101, a volume fraction of a gas component in a gas chamber at a first time point, a second time point, and a third time point in a non-equilibrium state is respectively acquired; wherein the first time point and the second time point are The interval between the two is equal to the interval between the second time point and the third time point; the gas in the gas chamber is separated by the oil-gas separation membrane to dissolve the dissolved gas in the oil-filled power equipment oil.

In the present embodiment, the separation process of the dissolved gas in the oil-filled power equipment oil by the oil-gas separation membrane is initially in a non-equilibrium state, and the dissolved gas in the oil continuously permeates into the gas chamber above the oil layer through the oil-gas separation membrane. When the gas in the oil and the gas chamber reaches an equilibrium state, the gas components in the gas chamber hardly change, and the equilibrium state is reached at this time. The gas in the gas chamber may contain a plurality of gas components, and may include, for example, hydrogen gas H ₂ , carbon monoxide CO, carbon dioxide CO _{2 ,} and methane CH _{4 ,} etc., and the prediction method provided by the embodiments of the present invention may be used for the volume of each gas component separately. The score is predicted. The following is an example of the prediction of the volume fraction of a gas component.

The first time point, the second time point and the third time point are selected in a non-equilibrium state, and the volume fraction of a gas component in the gas chamber at three time points is separately collected. For example, the volume fraction corresponding to the first time point is first collected, and then the volume fraction corresponding to the second time point and the volume fraction corresponding to the third time point are separately collected at the same time interval.

In S102, calculating a gas in the gas chamber under equilibrium according to a volume fraction corresponding to the first time point, a volume fraction corresponding to the second time point, a volume fraction corresponding to the third time point, and a volume fraction prediction formula The volume fraction of the component.

In this embodiment, the obtained volume fraction corresponding to the first time point, the volume fraction corresponding to the second time point, and the volume fraction corresponding to the third time point are substituted into the volume fraction prediction formula for calculation, and the equilibrium state can be calculated. The volume fraction of the gas component in the lower chamber. According to the predicted volume fraction of each target gas component in the gas chamber, the on-line monitoring of dissolved gas in the oil-filled power equipment can be performed.

The embodiment of the invention can calculate the volume fraction corresponding to the first time point in the non-equilibrium state, the volume fraction corresponding to the second time point, the volume fraction corresponding to the third time point, and the volume fraction prediction formula, and can predict the equilibrium state. The volume fraction of the gas components in the gas chamber, thereby predicting the volume fraction of dissolved gases in the oil. The embodiment of the invention can predict the final value of the volume fraction of the gas component in the equilibrium state air chamber according to the volume fraction of the gas component collected in the non-equilibrium state, and does not have to wait for the penetration into the equilibrium state before measuring the gas. The volume fraction of gas in the chamber, thereby reducing the time required to measure the volume fraction of dissolved gases in the oil, and meeting the real-time demand for on-line monitoring of dissolved gases in oil-filled power equipment.

As an embodiment of the present invention, the volume fraction prediction formula is:

among them,

a volume fraction of a gas component in the gas chamber in an equilibrium state; C _i(n-1) is a volume fraction corresponding to the first time point; C _in is a volume fraction corresponding to the second time point; C _{i( n+1)} is the volume fraction corresponding to the third time point.

As an embodiment of the present invention, the calculation process of the volume fraction prediction formula is specifically:

The volume fraction of gas components in the gas chamber during membrane separation from dissolved gases in the oil:

Where b is the diffusion coefficient; t is the time after the start of the infiltration; and C _i is the volume fraction of the gas component in the gas chamber;

The relationship between the volume fraction of the gas component in the gas chamber at the first time point t _n-1 in the non-equilibrium state and the volume fraction of the gas component in the gas chamber at the second time point t _n is obtained:

Where Δt=t _n -t _n-1 ; C _i(n-1) is the volume fraction of the gas component in the gas chamber at t _n-1 ; C _in is the volume fraction of the gas component in the gas chamber at t _n ;

According to the relationship, the intermediate calculation formula is obtained:

Where Δt=t _n -t _n-1 =t _n+1 -t _n ; C _i(n+1) is the volume fraction of the gas component in the gas chamber at the third time point t _n+1 ;

The intermediate calculation formula is simplified to obtain a volume fraction prediction formula as shown in the formula (1).

The calculation process of the volume fraction prediction formula will be specifically described below.

Through the analysis of the membrane permeation mechanism, the dynamic process expression of membrane separation on oil and gas, that is, the relationship between volume fraction and time, and the variation of volume fraction C _i of a gas component in the membrane separation process can be obtained. As shown in formula (2). It can be seen from equation (2) that it is usually only valuable when the penetration reaches the measured value of the equilibrium gas volume, which means that the measurement data before the equilibrium time point is reached does not accurately reflect the volume fraction of dissolved gases in the oil. The prediction method provided by the embodiment of the present invention can solve the problem.

In a non-equilibrium state, for a gas component, the volume fraction measured at t _n-1 point is C _i(n-1) , and the volume fraction measured at t _n point is C _in , which corresponds to this infiltration. The volume fraction when the process reaches equilibrium is

Then have the following relationship:

Since the time points t _n-1 and t _{n are} in an independent permeation process, there is b _n-1 = b _n = b, and the measurement time interval t _{n -} t _n-1 = Δt is set, when the temperature is constant, such as The relationship shown by the formula (3) is established.

Similarly, the relationship between the volume fraction measured by the t _n point and the volume fraction measured by C _in and t _n+1 is C _i(n+1) :

The simultaneous calculation formulas (3) and (6) can obtain the intermediate calculation formula shown in the formula (4), and the intermediate calculation formula is simplified to finally obtain the volume fraction prediction formula shown in the formula (1).

It can be seen from the above calculation process that the prediction method subtly eliminates the influence of the diffusion coefficient b on the volume fraction prediction result. Since the magnitude of the diffusion coefficient b is related to the temperature and the pressure, the prediction of the volume fraction prediction formula provided by the embodiment of the present invention can eliminate the influence of the external temperature and pressure on the prediction result, thereby improving the accuracy of the volume fraction prediction result.

This embodiment can be calculated by using the measured value of the gas component volume fraction at the same time interval in the same infiltration process, and accurately predicting the gas component in the gas chamber under equilibrium without knowing the diffusion coefficient b value. The final value of the volume fraction does not have to wait for the permeate into the equilibrium state before measuring the volume fraction of the gas in the gas chamber, thereby reducing the time for obtaining the volume fraction of the gas component in the gas chamber in equilibrium.

As an embodiment of the present invention, the volume fractions of the gas components in the gas chamber when the first time point, the second time point, and the third time point are respectively acquired in the non-equilibrium state include:

Obtain the volume fraction of the gas component in the gas chamber every preset time interval in the non-equilibrium state, and collect the volume fraction obtained in the adjacent three times as a group of data. The three volume fractions in each group of collected data are in chronological order. a volume fraction of gas components in the gas chamber as the first time point, the second time point, and the third time point;

Calculating a gas component in the gas chamber under equilibrium according to a volume fraction corresponding to the first time point, a volume fraction corresponding to the second time point, a volume fraction corresponding to the third time point, and a volume fraction prediction formula The volume fraction includes:

Calculating, according to the volume fraction corresponding to the first time point in the collected data of each group, the volume fraction corresponding to the second time point, the volume fraction corresponding to the third time point, and the volume fraction prediction formula, respectively calculating the equilibrium state corresponding to each group of collected data The volume fraction of gas components in the gas chamber;

The volume fraction of the gas components in the gas chamber in the equilibrium state corresponding to the collected data of each group is averaged, and the average value is taken as the volume fraction of the gas component in the gas chamber in the equilibrium state.

For example, when the oil-filled power device is in a non-equilibrium state, the volume fraction of the gas component in the gas chamber is obtained every predetermined time interval (for example, 10 minutes), and if the volume fraction is sequentially collected in the chronological order, For B, C, D, E, and F, the collected data can be divided into four groups, which are (A, B, C), (B, C, D), (C, D, E) and (D, E, F); or the divided collection data can be two groups, specifically (A, B, C) and (D, E, F).

According to the data collected by each group and the volume fraction prediction formula, the volume fraction of the gas components in the gas chamber under the equilibrium state corresponding to each group of collected data can be predicted, and the volume fraction corresponding to each group of collected data can be averaged to obtain the final equilibrium state. The volume fraction of gas components in the lower air chamber.

In this embodiment, by averaging the volume fractions predicted by the multiple acquisition data sets, the influence of the single data acquisition error on the final prediction result can be reduced, and the prediction of the volume fraction of the gas components in the gas chamber under the equilibrium state can be further improved. degree.

As an embodiment of the present invention, as shown in FIG. 2, after the average value is taken as the volume fraction of the gas component in the gas chamber in the equilibrium state, the method may further include:

In S201, on-line analysis of dissolved gases in the oil is performed according to the volume fraction of each gas component in the gas chamber in an equilibrium state.

In the present embodiment, according to the predicted volume fraction of each gas component in the gas chamber, an on-line analysis of the dissolved gas in the oil can be performed, and whether the oil-filled power equipment malfunctions and the cause of the failure are analyzed. For example, it is possible to determine whether the oil-filled power device has failed by comparing the volume fraction of each gas component in the gas chamber in a balanced state with a preset warning value.

In S202, the preset time interval is adjusted according to the online analysis result of dissolved gases in the oil.

In the present embodiment, the preset time interval may be adjusted according to the result of on-line analysis of dissolved gases in the oil, thereby adjusting the time after which the volume fraction of each gas component in the gas chamber in the equilibrium state is predicted, so that the dissolved gas in the oil Online analysis results can more effectively track the operating status of oil-filled power equipment such as transformers. For example, the first preset threshold may be set. If the on-line analysis result of the dissolved gas in the oil exceeds the first preset threshold, the oil-filled power device is easily damaged, and the preset time and time may be reduced, thereby shortening the gas chamber in the equilibrium state. The prediction time of the volume fraction of each gas component avoids the problem that the predicted time of the oil-filled power equipment is not detected in time, and the operation state of the oil-filled power equipment such as the transformer is more effectively tracked.

As an embodiment of the present invention, the present invention verifies the effectiveness and real-time performance of the dissolved gas volume fraction prediction algorithm in oil by comparing with offline gas chromatography measurement. In order to obtain the volume fraction of various gas components in the gas chamber under equilibrium, the offline gas chromatographic measurement is used, the prediction is performed according to the single set of collected data, and the prediction is performed according to the average of the multiple sets of collected data, and the verification data pair is as shown in Table 1. .

Table 1 verification data comparison table

It can be seen from Table 1 that the prediction method mentioned in the embodiment of the present invention is used to predict the gas volume fraction in the equilibrium state with high accuracy and short time, and can satisfy the effectiveness and timeliness of volume fraction on-line monitoring of dissolved gases in oil. Requirements.

It should be understood that the size of the sequence of the steps in the above embodiments does not imply a sequence of executions, and the order of execution of the processes should be determined by its function and internal logic, and should not be construed as limiting the implementation of the embodiments of the present invention.

Corresponding to the prediction method of the dissolved gas volume fraction in the oil described in the above embodiments, FIG. 3 is a schematic view showing the apparatus for predicting the dissolved gas volume fraction in the oil provided by the embodiment of the present invention. For the convenience of explanation, only the parts related to the present embodiment are shown.

Referring to FIG. 3, the apparatus includes an acquisition module 31 and a processing module 32.

The obtaining module 31 is configured to respectively acquire volume fractions of gas components in the air chamber at the first time point, the second time point, and the third time point in the non-equilibrium state; wherein the first time point and the second time The interval between the points is equal to the interval between the second time point and the third time point; the gas in the gas chamber is separated by the oil gas separation membrane to dissolve the dissolved gas in the oil-filled power equipment oil.

The processing module 32 is configured to calculate a gas chamber in a balanced state according to a volume fraction corresponding to the first time point, a volume fraction corresponding to the second time point, a volume fraction corresponding to the third time point, and a volume fraction prediction formula The volume fraction of the gas component.

Preferably, the volume fraction prediction formula is:

among them,

Preferably, the calculation process of the volume fraction prediction formula is specifically:

The intermediate calculation formula is simplified to obtain the volume fraction prediction formula.

Preferably, the obtaining module 31 is specifically configured to:

The processing module 32 is specifically configured to:

Preferably, the device further comprises an adjustment module, the adjustment module is configured to:

On-line analysis of dissolved gases in oil according to the volume fraction of each gas component in the gas chamber under equilibrium;

The preset time interval is adjusted according to the online analysis result of dissolved gases in the oil.

FIG. 4 is a schematic diagram of a terminal device according to an embodiment of the present invention. As shown in FIG. 4, the terminal device 4 of this embodiment includes a processor 40, a memory 41, and a computer program 42 stored in the memory 41 and operable on the processor 40, such as a dissolved gas volume in the oil. The forecasting procedure for the score. The steps in the embodiment of the method for predicting the dissolved gas volume fraction in each of the above-described oils when the processor 40 executes the computer program 42, such as steps 101 to 102 shown in FIG. Alternatively, when the processor 40 executes the computer program 42, the functions of the modules/units in the above various device embodiments are implemented, such as the functions of the modules 31 to 32 shown in FIG.

Illustratively, the computer program 42 can be partitioned into one or more modules/units that are stored in the memory 41 and executed by the processor 40 to complete this invention. The one or more modules/units may be a series of computer program instruction segments capable of performing a particular function, the instruction segments being used to describe the execution of the computer program 42 in the terminal device 4. For example, the computer program 42 can be divided into an acquisition module and a processing module, and the specific functions of each module are as follows:

The terminal device 4 may be a computing device such as a desktop computer, a notebook, a palmtop computer, and a cloud server. The terminal device may include, but is not limited to, a processor 40 and a memory 41. It will be understood by those skilled in the art that FIG. 4 is only an example of the terminal device 4, does not constitute a limitation of the terminal device 4, may include more or less components than those illustrated, or combine some components, or different components. For example, the terminal device may further include an input/output device, a network access device, a bus, a display, and the like.

The processor 40 may be a central processing unit (CPU), or may be other general-purpose processors, a digital signal processor (DSP), an application specific integrated circuit (ASIC), Field-Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware components, etc. The general purpose processor may be a microprocessor or the processor or any conventional processor or the like.

The memory 41 may be an internal storage unit of the terminal device 4, such as a hard disk or a memory of the terminal device 4. The memory 41 may also be an external storage device of the terminal device 4, for example, a plug-in hard disk equipped on the terminal device 4, a smart memory card (SMC), and a secure digital (SD). Card, flash card, etc. Further, the memory 41 may also include both an internal storage unit of the terminal device 4 and an external storage device. The memory 41 is used to store the computer program and other programs and data required by the terminal device. The memory 41 can also be used to temporarily store data that has been output or is about to be output.

It will be apparent to those skilled in the art that, for convenience and brevity of description, only the division of each functional unit and module described above is exemplified. In practical applications, the above functions may be assigned to different functional units as needed. The module is completed by dividing the internal structure of the device into different functional units or modules to perform all or part of the functions described above. Each functional unit and module in the embodiment may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit, and the integrated unit may be hardware. Formal implementation can also be implemented in the form of software functional units. In addition, the specific names of the respective functional units and modules are only for the purpose of facilitating mutual differentiation, and are not intended to limit the scope of protection of the present application. For the specific working process of the unit and the module in the foregoing system, reference may be made to the corresponding process in the foregoing method embodiment, and details are not described herein again.

In the above embodiments, the descriptions of the various embodiments are different, and the parts that are not detailed or described in a certain embodiment can be referred to the related descriptions of other embodiments.

Those of ordinary skill in the art will appreciate that the elements and algorithm steps of the various examples described in connection with the embodiments disclosed herein can be implemented in electronic hardware or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the solution. A person skilled in the art can use different methods for implementing the described functions for each particular application, but such implementation should not be considered to be beyond the scope of the present invention.

In the embodiments provided by the present invention, it should be understood that the disclosed apparatus/terminal device and method may be implemented in other manners. For example, the device/terminal device embodiments described above are merely illustrative. For example, the division of the modules or units is only a logical function division. In actual implementation, there may be another division manner, for example, multiple units. Or components may be combined or integrated into another system, or some features may be omitted or not performed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in electrical, mechanical or other form.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.

The integrated modules/units, if implemented in the form of software functional units and sold or used as separate products, may be stored in a computer readable storage medium. Based on such understanding, the present invention implements all or part of the processes in the foregoing embodiments, and may also be completed by a computer program to instruct related hardware. The computer program may be stored in a computer readable storage medium. The steps of the various method embodiments described above may be implemented when the program is executed by the processor. Wherein, the computer program comprises computer program code, which may be in the form of source code, object code form, executable file or some intermediate form. The computer readable medium may include any entity or device capable of carrying the computer program code, a recording medium, a USB flash drive, a removable hard disk, a magnetic disk, an optical disk, a computer memory, a read-only memory (ROM). , random access memory (RAM, Random Access Memory), electrical carrier signals, telecommunications signals, and software distribution media. It should be noted that the content contained in the computer readable medium may be appropriately increased or decreased according to the requirements of legislation and patent practice in a jurisdiction, for example, in some jurisdictions, according to legislation and patent practice, computer readable media It does not include electrical carrier signals and telecommunication signals.

The embodiments described above are only for explaining the technical solutions of the present invention, and are not intended to be limiting; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art will understand that The technical solutions described in the examples are modified, or some of the technical features are equivalently replaced; and the modifications or substitutions do not deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in Within the scope of protection of the present invention.

Claims

A method for predicting a volume fraction of dissolved gases in an oil, comprising:

Obtaining a volume fraction of a gas component in the gas chamber at a first time point, a second time point, and a third time point in a non-equilibrium state; wherein an interval between the first time point and the second time point is equal to An interval between the second time point and the third time point; the gas in the gas chamber is separated by a gas separation membrane to dissolve dissolved gas in the oil-filled power equipment oil;

Calculating a volume of a gas component in the gas chamber in an equilibrium state according to a volume fraction corresponding to the first time point, a volume fraction corresponding to the second time point, a volume fraction corresponding to the third time point, and a volume fraction prediction formula fraction.
A method for predicting a volume fraction of dissolved gases in an oil according to claim 1, wherein said volume fraction prediction formula is:

among them,
a volume fraction of a gas component in the gas chamber in an equilibrium state; C i(n-1) is a volume fraction corresponding to the first time point; C in is a volume fraction corresponding to the second time point; C i( n+1) is the volume fraction corresponding to the third time point.
The method for predicting a volume fraction of dissolved gases in an oil according to claim 2, wherein the calculation process of the volume fraction prediction formula is specifically:

The volume fraction of gas components in the gas chamber during membrane separation from dissolved gases in the oil:

Where b is the diffusion coefficient; t is the time after the start of the infiltration; and C i is the volume fraction of the gas component in the gas chamber;

The relationship between the volume fraction of the gas component in the gas chamber at the first time point t n-1 in the non-equilibrium state and the volume fraction of the gas component in the gas chamber at the second time point t n is obtained:

Where Δt=t n -t n-1 ; C i(n-1) is the volume fraction of the gas component in the gas chamber at t n-1 ; C in is the volume fraction of the gas component in the gas chamber at t n ;

According to the relationship, the intermediate calculation formula is obtained:

Where Δt=t n -t n-1 =t n+1 -t n ; C i(n+1) is the volume fraction of the gas component in the gas chamber at the third time point t n+1 ;

The intermediate calculation formula is simplified to obtain the volume fraction prediction formula.
The method for predicting a volume fraction of dissolved gas in an oil according to any one of claims 1 to 3, wherein the first time point, the second time point, and the third time point in the non-equilibrium state are respectively obtained The volume fraction of gas components in the chamber includes:

Obtain the volume fraction of the gas component in the gas chamber every preset time interval in the non-equilibrium state, and collect the volume fraction obtained in the adjacent three times as a group of data. The three volume fractions in each group of collected data are in chronological order. a volume fraction of gas components in the gas chamber as the first time point, the second time point, and the third time point;

Calculating a gas component in the gas chamber under equilibrium according to a volume fraction corresponding to the first time point, a volume fraction corresponding to the second time point, a volume fraction corresponding to the third time point, and a volume fraction prediction formula The volume fraction includes:

Calculating, according to the volume fraction corresponding to the first time point in the collected data of each group, the volume fraction corresponding to the second time point, the volume fraction corresponding to the third time point, and the volume fraction prediction formula, respectively calculating the equilibrium state corresponding to each group of collected data The volume fraction of gas components in the gas chamber;

The volume fraction of the gas components in the gas chamber in the equilibrium state corresponding to the collected data of each group is averaged, and the average value is taken as the volume fraction of the gas component in the gas chamber in the equilibrium state.
The method for predicting a volume fraction of a dissolved gas in an oil according to claim 4, wherein after the average value is used as a volume fraction of a gas component in the gas chamber in an equilibrium state, the method further comprises:

On-line analysis of dissolved gases in oil according to the volume fraction of each gas component in the gas chamber under equilibrium;

The preset time interval is adjusted according to the online analysis result of dissolved gases in the oil.
A device for predicting a volume fraction of dissolved gases in an oil, comprising:

Obtaining a module, respectively, for acquiring a volume fraction of a gas component in a gas chamber at a first time point, a second time point, and a third time point in a non-equilibrium state; wherein the first time point and the second time point The interval between the two is equal to the interval between the second time point and the third time point; the gas in the gas chamber is separated by the oil and gas separation membrane to dissolve the dissolved gas in the oil-filled power equipment oil;

a processing module, configured to calculate a balance state in a gas chamber according to a volume fraction corresponding to the first time point, a volume fraction corresponding to the second time point, a volume fraction corresponding to the third time point, and a volume fraction prediction formula The volume fraction of the gas component.
A prediction device for a dissolved gas volume fraction in an oil, comprising: the volume fraction prediction formula is:

among them,
a volume fraction of a gas component in the gas chamber in an equilibrium state; C i(n-1) is a volume fraction corresponding to the first time point; C in is a volume fraction corresponding to the second time point; C i( n+1) is the volume fraction corresponding to the third time point.
The apparatus for predicting a volume fraction of dissolved gas in an oil according to claim 7, wherein the calculation process of the volume fraction prediction formula is specifically:

The volume fraction of gas components in the gas chamber during membrane separation from dissolved gases in the oil:

Where b is the diffusion coefficient; t is the time after the start of the infiltration; and C i is the volume fraction of the gas component in the gas chamber;

The relationship between the volume fraction of the gas component in the gas chamber at the first time point t n-1 in the non-equilibrium state and the volume fraction of the gas component in the gas chamber at the second time point t n is obtained:

Where Δt=t n -t n-1 ; C i(n-1) is the volume fraction of the gas component in the gas chamber at t n-1 ; C in is the volume fraction of the gas component in the gas chamber at t n ;

According to the relationship, the intermediate calculation formula is obtained:

Where Δt=t n -t n-1 =t n+1 -t n ; C i(n+1) is the volume fraction of the gas component in the gas chamber at the third time point t n+1 ;

The intermediate calculation formula is simplified to obtain the volume fraction prediction formula.
A terminal device comprising a memory, a processor, and a computer program stored in the memory and operable on the processor, wherein the processor executes the computer program as claimed in claim 1 5 The steps of any of the methods described.
A computer readable storage medium storing a computer program, wherein the computer program, when executed by a processor, implements the steps of the method of any one of claims 1 to 5.