JP2020521230A - Prediction method of dissolved gas volume fraction in oil and terminal device - Google Patents

Abstract

This technical solution is applied to the technical field of dissolved gas monitoring, and provides a method and a terminal device for predicting a dissolved gas volume fraction in oil. The method includes acquiring volume fractions of gas components in a gas chamber at a first time point, a second time point, and a third time point in a non-equilibrium state, respectively, and obtaining a volume corresponding to the first time point. According to the fraction, the volume fraction corresponding to the second time point, the volume fraction corresponding to the third time point, and the volume fraction prediction formula, the volume fraction of the gas component in the gas chamber in the equilibrium state is calculated. Including and. This technical solution can predict the final value of the gas component volume fraction in the gas chamber in the equilibrium state according to the volume fraction of the gas component collected several times in the non-equilibrium state. It is not necessary to wait for equilibrium permeation before re-measuring the gas volume fraction, which reduces the time required to measure the dissolved gas volume fraction in oil. [Selection diagram] Figure 1

Description

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

There is an urgent need to transform the current equipment maintenance system as the power grid develops in a highly automated direction, and as the national economy and people's lives become more demanding about the reliability of the electricity supply The development trend that the condition maintenance system based on monitoring and fault diagnosis technology gradually replaces the preventive maintenance system has become inevitable. Compared with the importance of operational reliability of oil-filled power equipment such as transformers and the price of conventional online monitoring equipment, the use of online monitoring equipment has significant advantages in terms of technology and economy, Not only can it improve the operational management level, but it can also lay the foundation for the transition from a preventive maintenance system to a predictive maintenance system.

After the fault gas of oil-filled power equipment is generated, it is dissolved in insulating oil, but important technologies during online monitoring of dissolved gas in oil include oil-gas separation technology and gas quantitative analysis technology. .. Currently, online monitoring systems have to provide accurate volume fractions of dissolved gas in oil after gas permeation has reached equilibrium, and due to limitations in oil-gas separation technology, there is always a failure. The time required for the gas to reach equilibrium may increase. For example, Roland Gilbert tested the gas collector GP100 of the Morgan Schaffer company for the permeability of various fault gases, in which H ₂ reached equilibrium after 6 hours but required the longest equilibration time. C ₃ H ₈ was equilibrated after 239.3 hours and the rest of the gas was equilibrated within 96 hours. The new oil/gas separation membrane developed by Li Hong Lei and others at Tsinghua University in China has a total of 7 types of C ₂ H ₂ , C ₂ H ₄ , C ₂ H ₆ , CH ₄ , CO, CO ₂ and H _{2 within 12} h. Achieved the equilibrium of the fault gas. 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 online monitoring of dissolved gas in oil-filled power equipment.

In view of this, the embodiment of the present invention is to solve the problem that the current method of predicting the volume fraction is difficult to meet the real-time requirement of online monitoring of dissolved gas in oil-filled power equipment. Disclosed is a method for predicting a dissolved gas volume fraction and a terminal device.

The first aspect of the embodiment of the present invention is
Obtaining the volume fractions of the gas components in the gas chamber at the first time point, the second time point, and the third time point in the non-equilibrium state, respectively, the first time point and the second time point. Is equal to the interval between the second time point and the third time point, and the gas in the gas chamber passes through the oil/gas separation membrane to dissolve the dissolved gas in the oil of the oil-filled power equipment. Can be obtained by separating
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 the volume fraction prediction formula, the inside of the gas chamber in the equilibrium state is calculated. Calculating a volume fraction of a gas component, and a method of predicting a dissolved gas volume fraction in oil.

A second aspect of the embodiment of the present invention is
An acquisition module for acquiring the volume fractions of the gas components in the gas chamber at the first time point, the second time point, and the third time point in the non-equilibrium state, respectively. The interval between the two time points is equal to the interval between the second time point and the third time point, and the gas in the gas chamber passes through the oil/gas separation membrane into the oil of the oil-filled power equipment. An acquisition module obtained by separating the dissolved gas of
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 the volume fraction prediction formula, the inside of the gas chamber in the equilibrium state is calculated. A device for predicting a dissolved gas volume fraction in oil, comprising: a processing module for calculating a volume fraction of a gas component.

A third aspect of the embodiment of the present invention includes a memory, a processor, and a computer program stored in the memory and executable by the processor, wherein the oil in the first aspect is executed when the processor executes the computer program. Provided is a terminal device that realizes the method for predicting the dissolved gas volume fraction of.

A fourth aspect of an embodiment of the present invention is a computer readable computer program storing a computer program that implements the method of predicting a dissolved gas volume fraction in oil according to the first aspect when the computer program is executed by a processor. Storage medium is provided.

Compared with the prior art, the embodiments of the present invention have the following beneficial effects. By calculating for 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 The volume fraction of the gas component in the gas chamber in the equilibrium state can be predicted, and thus the volume fraction of dissolved gas in oil can be predicted. The embodiment of the present invention can predict the final value of the volume fraction of the gas component in the equilibrium gas chamber according to the volume fraction of the gas component collected several times in the non-equilibrium state. It is not necessary to wait for permeation to equilibrium before re-measuring the volume fraction of the gas in the room, which reduces the time required to measure the dissolved gas volume fraction in oil and reduces Meet the real-time demand for online monitoring of dissolved gas in power equipment.

3 is a flowchart showing implementation of a method for predicting a dissolved gas volume fraction in oil provided by an embodiment of the present invention. 6 is a flowchart showing an implementation of adjusting a preset time interval in the method for predicting a dissolved gas volume fraction in oil provided by an embodiment of the present invention. It is a schematic diagram of the prediction apparatus of the dissolved gas volume fraction in oil provided by the Example of this invention. It is a schematic diagram of the prediction terminal device of the dissolved gas volume fraction in oil provided by the Example of this invention.

Hereinafter, in order to more clearly describe the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced. The drawings in the following description are merely some embodiments of the present invention, and it is obvious that those skilled in the art can obtain other drawings by these drawings, provided that they do not contribute to creative work. ..

The following description, for purposes of explanation and not limitation, details of particular system configurations, techniques, etc. are provided so that the embodiments of the invention may be fully understood. However, it will be apparent to those skilled in the art that the present invention may be implemented in other embodiments without such details. In other cases, detailed descriptions of well-known systems, devices, circuits and methods are omitted in order to avoid unnecessary detail that would interfere with the description of the invention.

In order to explain the technical solutions described in the present invention, the following will be described by way of specific examples.

FIG. 1 is a flowchart showing an implementation of a method for predicting a dissolved gas volume fraction in oil provided by an embodiment of the present invention, and specifically, the following.

In S101, the volume fractions of the gas components in the gas chamber at the first time point, the second time point, and the third time point in the non-equilibrium state are respectively acquired, and the volume fractions of the first time point and the second time point are acquired. The interval is equal to the interval between the second time point and the third time point, and the gas in the gas chamber passes through the oil/gas separation membrane to dissolve the dissolved gas in the oil of the oil-filled power equipment. Obtained separately.

In the present example, the process of separating the dissolved gas in the oil of the oil-filled power equipment using the oil/gas separation membrane is initially in a non-equilibrium state, and the dissolved gas in the oil is the oil/gas. It continuously permeates through the separation membrane into the gas chamber above the oil layer. After the gas in the oil and the gas in the gas chamber reach the equilibrium state, the gas components in the gas chamber hardly change, and the gas enters the equilibrium state at this point. The gas in the gas chamber may include a plurality of gas components such as hydrogen (H ₂ ), carbon monoxide (CO), carbon dioxide (CO ₂ ) and methane (CH ₄ ). The prediction method provided by the embodiments of the present invention can be used to predict the volume fraction of each gas component separately, the following is an example of predicting the volume fraction of a gas component. As described below.

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

In S102, 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 the volume fraction prediction formula, Calculate the volume fraction of gas components in the gas chamber.

In the present embodiment, the acquired 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. When the calculation is performed, the volume fraction of the gas component in the gas chamber in the equilibrium state can be calculated. Online monitoring of the dissolved gas of the oil-filled power equipment can be performed according to the predicted volume fraction of each target gas component in the gas chamber in the equilibrium state.

In the embodiment of the present invention, 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. By performing the calculation for, the volume fraction of the gas component in the gas chamber in the equilibrium state can be predicted, and the volume fraction of the dissolved gas in oil can be predicted. The embodiment of the present invention predicts the final value of the gas component volume fraction in the equilibrium gas chamber according to the volume fraction of the gas component collected several times in the non-equilibrium state, and There is no need to wait for permeation to equilibrium before re-measuring the gas volume fraction, which reduces the time required to measure the dissolved gas volume fraction in oil and reduces the Meet the real-time demand for online monitoring of dissolved gases.

As one embodiment of the present invention, the volume fraction prediction formula is formula (1).

In the formula, C _i ^max is a volume fraction of the gas component in the gas chamber in the equilibrium state, C _i(n−1) is a volume fraction corresponding to the first time point, and C _in is , C _i(n+1) is the volume fraction corresponding to the third time point.

式中、ｂは、拡散係数であり、ｔは、透過開始後の時間であり、Ｃ_ｉは、ｔのときのガス室内のガス成分の体積分率であり、
非平衡状態での第１の時点ｔ_ｎ−１のときのガス室内のガス成分の体積分率と第２の時点ｔ_ｎのときのガス室内のガス成分の体積分率の間の関係式である式（３）が得られ、

式中、Δｔ＝ｔ_ｎ−ｔ_ｎ−１であり、Ｃ_{ｉ（ｎ−１）}は、ｔ_ｎ−１のときのガス室内のガス成分の体積分率であり、Ｃ_ｉｎは、ｔ_ｎのときのガス室内のガス成分の体積分率であり、
前記関係式によって、中間計算式である式（４）が得られ、

式中、Δｔ＝ｔ_ｎ−ｔ_ｎ−１＝ｔ_ｎ＋１−ｔ_ｎであり、Ｃ_{ｉ（ｎ＋１）}は、第３の時点ｔ_ｎ＋１の時のガス室内のガス成分の体積分率であり、
前記中間計算式を簡略化して、式（１）に示されたような体積分率予測式を取得する。 As one embodiment of the present invention, the calculation process of the volume fraction prediction formula is specifically as follows.
According to the equation (2) which is the volume fraction of the gas component in the gas chamber in the membrane separation process of the dissolved gas in oil,

Where b is the diffusion coefficient, t is the time after the start of permeation, C _i is the volume fraction of the gas component in the gas chamber at t,
The relational expression 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 A formula (3) is obtained,

In the formula, 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 , and C _in is t _n . Is the volume fraction of the gas component in the gas chamber at
From the relational expression, an intermediate calculation expression (4) is obtained,

Where Δt=t _n −t _n−1 =t _n+1 −t _n , and 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 as shown in 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 the membrane and oil/gas separation, that is, the relational expression between the volume fraction and the time, can be obtained, and the gas component volume fraction in the gas chamber in the membrane separation process can be obtained. The law of change of C _i is as shown in equation (2). From equation (2), it can be seen that permeation is usually only valuable when the equilibrium gas volume measurement is reached, which means that the measured data before the equilibrium point is reached is dissolved in oil. It means that the volume fraction of gas cannot be accurately reflected. However, the prediction method provided by the embodiments of the present invention can solve this problem.

In a non-equilibrium state, for a certain gas component, the volume fraction measured at the t _n-1 point is C _i(n-1), and the volume fraction measured at the t _n point is C _in. In this case, when the corresponding volume fraction when the permeation process reaches equilibrium is C _i ^max , the following relationship (5) is established.

Since the times t _n-1 and t _n are in the independent transmission process, there is b _n-1 =b _n =b and the temperature is constant with the measurement time interval t _n −t _n−1 =Δt. , The relationship as shown in Expression (3) is established.

Similarly, the relational expression of _t volume fraction measured at _n points _{C in} the _{t n + 1} volume fraction measured at point _{C i (n + 1)} is as in equation (6).

If the equations (3) and (6) are combined, the intermediate calculation formula shown in the formula (4) can be obtained. If the intermediate calculation formula is simplified, the volume fraction prediction shown in the final formula (1) can be obtained. Get the expression.

From the above calculation process, it can be seen that the prediction method intelligently removes the influence of the diffusion coefficient b on the prediction result of the volume fraction. Since the magnitude of the diffusion coefficient b is related to the temperature and the pressure, the influence of the external temperature and the pressure on the prediction result can be eliminated by predicting the volume fraction prediction formula provided by the embodiment of the present invention. This improves the accuracy of the prediction result of the volume fraction.

This example can be calculated by using the measured values of the gas component volume fractions of the same permeation process at the same time intervals, and the gas in the gas chamber in the equilibrium state can be calculated without knowing the diffusion coefficient b value. It is not necessary to accurately predict the final value of the component volume fraction and wait for permeation to equilibrium before re-measurement of the gas volume fraction in the gas chamber, thereby Shorten the time to obtain the gas component volume fraction.

As one embodiment of the present invention, acquiring the volume fractions of the gas components in the gas chamber at the first time point, the second time point, and the third time point in the non-equilibrium state, respectively,
In the non-equilibrium state, the volume fraction of the gas component in the gas chamber is acquired once at each preset time interval, and the volume fractions acquired three times adjacently are set as one set of collected data, and in the order of time, Including sequentially making the three volume fractions in the collected data of the set the volume fractions of the gas components in the gas chamber at the first time point, the second time point and the third time point,
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 the volume fraction prediction formula, the inside of the gas chamber in the equilibrium state is calculated. Calculating the volume fraction of gas components is
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 the volume fraction prediction formula in the collected data of each set, Calculating the volume fractions of the gas components in the gas chamber at equilibrium corresponding to the collected data, and
Obtaining the average value of the volume fraction of the gas component in the gas chamber in the equilibrium state corresponding to the collected data of each set, and the average value as the volume fraction of the gas component in the gas chamber in the equilibrium state. Including.

For example, when the transmission of the oil-filled power equipment is in a non-equilibrium state, the volume fraction of the gas component in the gas chamber is acquired once every preset time interval (for example, 10 minutes), and is collected sequentially in time order. When the volume fractions obtained are A, B, C, D, E and F, the divided collection data are specifically (A, B, C), (B, C, D), (respectively). C, D, E) and (D, E, F) or four sets of collected data are specifically (A, B, C) and (D, E, F), respectively. ) Are two sets.

According to the collected data of each set and the volume fraction prediction formula, it is possible to predict the volume fraction of the gas component in the gas chamber in the equilibrium state corresponding to the collected data of each set, which corresponds to the collected data of each set. By averaging with respect to the volume fraction, the volume fraction of the gas component in the gas chamber in the final equilibrium state can be obtained.

This example can reduce the effect of a single data collection error on the final prediction result by averaging the volume fractions predicted by the data sets collected several times, and The prediction accuracy of the volume fraction of the gas component in the gas chamber is further improved.

As an example of the present invention, as shown in FIG. 2, after the average value is used as the volume fraction of the gas component in the gas chamber in the equilibrium state, the following can be further included.

In S201, it further includes performing an online analysis of the dissolved gas in the oil according to the volume fraction of each gas component in the gas chamber in the equilibrium state.

In this example, according to the volume fraction of each gas component in the gas chamber in the predicted equilibrium state, online analysis of the dissolved gas in the oil, whether the oil-filled power equipment has failed, and Analyze the cause of failure. For example, by comparing the volume fraction of each gas component in the gas chamber in the equilibrium state with the preset warning value, it can be determined whether or not the oil-filled power equipment has failed.

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

In this example, the preset time interval can be adjusted according to the result of the online analysis of the dissolved gas in the oil, thereby predicting the volume fraction of each gas component in the gas chamber in the equilibrium state. By adjusting the time until, the online analysis result of dissolved gas in oil can more effectively track the operating state of oil-filled power equipment such as transformers. For example, when the first preset threshold value is set and the online analysis result of the dissolved gas in the oil exceeds the first preset threshold value, it can be shown that the oil-filled power equipment is likely to fail, and the preset time period is set to Decrease and shorten the prediction time of the volume fraction of each gas component in the gas chamber at equilibrium state, thereby avoiding the problem that the prediction time is too long and the failure of the oil-filled power equipment is not found in time. Thus, it is possible to more effectively track the operating state of the oil-filled power equipment such as the transformer.

As an example of the present invention, the example of the present invention verifies the effectiveness and real time of the dissolved gas volume fraction prediction algorithm in oil by comparing with the measurement of off-line gas chromatography. To obtain the volume fractions of various gas components in the gas chamber at equilibrium, we use offline gas chromatography measurements, one set of predictions based on collected data and one set of predictions based on the average of multiple sets of collected data, respectively. The comparison of the verification data is as shown in Table 1.

From Table 1, since the prediction of the gas volume fraction in the equilibrium state using the prediction method described in the example of the present invention is highly accurate and takes a short time, the dissolved gas in oil with respect to the volume fraction is predicted. It can meet the requirements of effectiveness and timeliness of online monitoring.

In the embodiment of the present invention, 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. By performing the calculation for, the volume fraction of the gas component in the gas chamber in the equilibrium state can be predicted, and the volume fraction of the dissolved gas in oil can be predicted. The embodiment of the present invention predicts the final value of the gas component volume fraction in the gas chamber in the equilibrium state in accordance with the volume fraction of the gas component collected several times in the non-equilibrium state, and It is not necessary to wait for permeation to equilibrium before re-measuring the gas volume fraction, which reduces the time required to measure the dissolved gas volume fraction in oil and reduces the Meet the real-time demand for online monitoring of dissolved gases.

The magnitude of the order of each step in the above embodiments does not mean before and after the order of execution, and the execution order of each process should be determined by its function and internal logic. It should be understood that the implementation process of an example should not be construed as limiting.

Corresponding to the method for predicting the dissolved gas volume fraction in oil described in the above examples, FIG. 3 is a schematic diagram of the device for predicting the dissolved gas volume fraction in oil provided by the embodiment of the present invention. showed that. For convenience of explanation, only the portion related to the present embodiment is shown.

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

The acquisition module 31 is used to acquire the volume fractions of the gas components in the gas chamber at the first time point, the second time point, and the third time point in the non-equilibrium state, respectively. The interval between the second time points is equal to the interval between the second time points and the third time points, and the gas in the gas chamber passes through the oil/gas separation membrane to the oil-filled power equipment. It is obtained by separating dissolved gas in oil.

The processing module 32 is in an equilibrium state 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 the volume fraction prediction formula. It is used to calculate the volume fraction of gas components in the gas chamber at.

である。 Preferably, the volume fraction prediction formula is

Is.

In the formula, C _i ^max is a volume fraction of the gas component in the gas chamber in the equilibrium state, C _i(n−1) is a volume fraction corresponding to the first time point, and C _in is , C _i(n+1) is the volume fraction corresponding to the third time point.

によって、
式中、ｂは、拡散係数であり、ｔは、透過開始後の時間であり、Ｃ_ｉは、ｔのときのガス室内のガス成分の体積分率であり、
非平衡状態での第１の時点ｔ_ｎ−１のときのガス室内のガス成分の体積分率と第２の時点ｔ_ｎのときのガス室内のガス成分の体積分率の間の関係式：

が得られ、
式中、Δｔ＝ｔ_ｎ−ｔ_ｎ−１であり、Ｃ_{ｉ（ｎ−１）}は、ｔ_ｎ−１のときのガス室内のガス成分の体積分率であり、Ｃ_ｉｎは、ｔ_ｎのときのガス室内のガス成分の体積分率であり、
前記関係式に応じて、中間計算式：

が得られ、
式中、Δｔ＝ｔ_ｎ−ｔ_ｎ−１＝ｔ_ｎ＋１−ｔ_ｎであり、Ｃ_{ｉ（ｎ＋１）}は、第３の時点ｔ_ｎ＋１のときのガス室内のガス成分の体積分率であり、
前記中間計算式を簡略化して、前記体積分率予測式を取得する。 Preferably, the calculation process of the volume fraction prediction formula is specifically
Volume fraction of gas components in gas chamber during membrane separation process of dissolved gas in oil:

By
Where b is the diffusion coefficient, t is the time after the start of permeation, C _i is the volume fraction of the gas component in the gas chamber at t,
The relational expression 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,
In the formula, 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 , and C _in is t _n . Is the volume fraction of the gas component in the gas chamber at
According to the relational expression, an intermediate calculation formula:

Is obtained,
Where Δt=t _n −t _n−1 =t _n+1 −t _n , and 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.

Preferably, the acquisition module 31 is specifically,
In the non-equilibrium state, the volume fraction of the gas component in the gas chamber is acquired once at each preset time interval, and the volume fractions acquired three times adjacently are set as one set of collected data, and in the order of time, Used to sequentially take the three volume fractions in the collected data of the set as the volume fractions of the gas components in the gas chamber at the first time point, the second time point and the third time point,
The processing module 32 is, specifically,
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 the volume fraction prediction formula in the collected data of each set, Calculate the volume fractions of gas components in the gas chamber in the equilibrium state corresponding to the collected data,
Used to find the average value of the volume fraction of the gas component in the gas chamber in the equilibrium state corresponding to the collected data of each set, and use the average value as the volume fraction of the gas component in the gas chamber in the equilibrium state To be done.

Preferably, the device is
Depending on the volume fraction of each gas component in the gas chamber in equilibrium, perform an online analysis of the dissolved gas in the oil,
It further includes an adjustment module for adjusting the preset time interval according to the result of the online analysis of the dissolved gas in the oil.

In the embodiment of the present invention, 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. By performing the calculation for, the volume fraction of the gas component in the gas chamber in the equilibrium state can be predicted, and the volume fraction of the dissolved gas in oil can be predicted. The embodiment of the present invention predicts the final value of the gas component volume fraction in the gas chamber in the equilibrium state in accordance with the volume fraction of the gas component collected several times in the non-equilibrium state, and It is not necessary to wait for permeation to equilibrium before re-measuring the gas volume fraction, which reduces the time required to measure the dissolved gas volume fraction in oil and reduces Meet the real-time demand for on-line monitoring of dissolved gases.

FIG. 4 is a schematic diagram of a terminal device provided according to an embodiment of the present invention. As shown in FIG. 4, the terminal device 4 of the embodiment is a processor 40, a memory 41, and a predictor of a dissolved gas volume fraction in oil that is stored in the memory 41 and can operate on the processor 40. A computer program 42 such as a program is included. When the processor 40 executes the computer program 42, the steps in the embodiment of the method for predicting the dissolved gas volume fraction in each oil described above are realized, for example, steps 101 to 102 shown in FIG. Alternatively, when the processor 40 executes the computer program 42, it implements the functions of each module/unit in the above embodiments of each device, such as the functions of the modules 31 to 32 shown in FIG.

Exemplarily, the computer program 42 is stored in the memory 41 and may be divided into one or more modules/units to be executed by the processor 40, thus completing the present invention. The one or more modules/units may be a series of computer program instruction segments capable of completing a particular function, the instruction segments describing the execution process of the computer program 42 in the terminal device 4. Used to 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 acquisition module is used to acquire the volume fractions of the gas components in the gas chamber at the first time point, the second time point, and the third time point in the non-equilibrium state, respectively, and the first time point and the The interval between the second time points is equal to the interval between the second time points and the third time points, and the gas in the gas chamber passes through the oil/gas separation membrane to the oil of the oil-filled power equipment. It is obtained by separating the dissolved gas inside.

The processing module is in an equilibrium state 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 the volume fraction prediction formula. Used to calculate the volume fraction of gas components in the gas chamber of the.

The terminal device 4 can 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. FIG. 4 is merely an example of a terminal device 4, which does not constitute a limitation on the terminal device 4, may include more or less parts than shown, or may combine several or different parts, For example, those skilled in the art will understand that 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), another general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), or the like. It may be a Field-Programmable Gate Array (FPGA) or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, etc. A general purpose processor may be a microprocessor or the processor may be 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 an internal storage device of the terminal device 4. The memory 41 is, for example, a plug-in hard disk mounted in the terminal device 4, a smart media (registered trademark) card (Smart Media Card: SMC), a secure digital (SD) card, a flash card (Flash Card). For example, it may be an external storage device of the terminal device 4. Further, the memory 41 may include both an internal storage unit and an external storage device of the terminal device 4. The memory 41 is used to store the computer program and other programs and data required by the terminal device. The memory 41 can be used to temporarily store the output data or the data to be output.

For convenience and simplicity of description, only the division of the above functional units and modules will be illustrated and described, but in an actual application, the above functions may be assigned and different functional units and modules may be used as necessary. It will be apparent to those skilled in the art to complete, ie, divide the internal structure of the device into different functional units or modules to complete all or some of the above functions. Each functional unit and module in the embodiments may be integrated into one processing unit, or each unit may physically exist separately, or two or more units may be integrated into one unit. Alternatively, the integrated unit may be implemented in the form of hardware or a software functional unit. It should be noted that the specific names of each functional unit and module are only for the purpose of promoting mutual differentiation and are not intended to limit the scope of protection of the present application. For the specific working process of the units and modules of the above system, reference can be made to the corresponding process in the embodiments of the method described above, and details are not described here again.

In the above embodiments, all the explanations of the respective embodiments are focused, and for the portions which are not described in detail or explained in one embodiment, the related explanations of other embodiments are referred to. it can.

Those skilled in the art can understand that the various exemplary units and algorithm steps described in the embodiments disclosed herein can be implemented by electronic hardware or a combination of computer software and electronic hardware. right. Whether these functions are implemented in hardware or software depends on the particular application of the technical solution and the design constraints. A technician may implement the described functionality by implementing it in different ways for a particular application, but such an implementation should not be considered beyond the scope of the present invention.

It is to be understood that in the embodiments provided by the present invention, the disclosed device/terminal device and method can be implemented in other ways. For example, the above-described device/terminal device embodiments are merely examples, and for example, the division of the modules or units is only division of logical functions, and in actual implementation, another division method, for example, Multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. In addition, the displayed or discussed mutual couplings or direct couplings or communication connections can be indirect couplings or communication connections via several interfaces, devices or units, electrical, mechanical Or it could be another form.

Units described as separate parts may or may not be physically separated, and parts displayed as units may or may not be physical units, i.e. in one place. It may be deployed or distributed across multiple network units. Depending on the actual demand, some or all of the units can be selected to realize the purpose of the scheme of this embodiment.

It should be noted that each functional unit in each embodiment of the present invention may be integrated into one processing unit, each unit may physically exist separately, or two or more units may be combined into one unit. May be integrated. The above integrated unit may be implemented in the form of hardware or software functional unit.

When the integrated modules/units are realized in the form of software functional units and sold or used as individual products, they can be stored in one computer-readable storage medium. Based on such an understanding, the present invention can also be completed by a computer program that implements all or part of the processes in the methods of the above-described embodiments and instruct relevant hardware. , Which can be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method embodiments can be realized. Here, the computer program includes computer program code, which may be in a source code form, an object code form, an executable file or some intermediate form. The computer-readable medium is any entity or device capable of carrying the computer program code, a recording medium, a U flash disk, a removable hard disk, a magnetic disk, an optical disk, a computer memory, a read-only memory (ROM). Memory), Random Access Memory (RAM), electrical carrier signals, communication signals, software distribution media, and the like. It should be noted that the content contained on the computer-readable medium may be appropriately scaled up or down according to the requirements of jurisdiction law and patent practice. For example, in some jurisdictions, computer readable media do not contain electrical carrier signals and communication signals in accordance with law and patent practice.

The embodiments described above are merely intended for illustrating the technical solutions of the present invention and are not intended to be limiting, and the present invention will be described in detail with reference to the aforementioned embodiments. However, those skilled in the art may modify the technical solution described in each of the above-described embodiments or replace some technical features equivalently. It is to be understood that the essence of the corresponding technical solution shall all be included within the protection scope of the present invention without departing from the spirit and scope of the technical solution of each embodiment of the present invention.

Claims (10)

A method for predicting a dissolved gas volume fraction in oil, comprising:
Obtaining the volume fractions of the gas components in the gas chamber at the first time point, the second time point, and the third time point in the non-equilibrium state, respectively, the first time point and the second time point. Is equal to the interval between the second time point and the third time point, and the gas in the gas chamber passes through the oil/gas separation membrane to dissolve the dissolved gas in the oil of the oil-filled power equipment. Can be obtained by separating
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 the volume fraction prediction formula, the gas chamber in an equilibrium state. And calculating a volume fraction of the gas component of the above. The volume fraction prediction formula is

And
In the formula, C _i ^max is a volume fraction of the gas component in the gas chamber in an equilibrium state, C _i(n−1) is a volume fraction corresponding to the first time point, and C _in Is the volume fraction corresponding to the second time point, and C _i(n+1) is the volume fraction corresponding to the third time point,
The method for predicting a dissolved gas volume fraction in oil according to claim 1. Specifically, the calculation process of the volume fraction prediction formula is as follows.
Volume fraction of gas component in gas chamber in membrane separation process of dissolved gas in oil:

By
Where b is the diffusion coefficient, t is the time after the start of permeation, C _i is the volume fraction of the gas component in the gas chamber at t,
The relational expression 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,
In the formula, 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 , and C _in is t _n . Is the volume fraction of the gas component in the gas chamber at
According to the above relational expression, an intermediate calculation formula:

Is obtained,
Where Δt=t _n −t _n−1 =t _n+1 −t _n , and 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 dissolved gas volume fraction in oil according to claim 2. Obtaining the volume fractions of the gas components in the gas chamber at the first time point, the second time point, and the third time point in the non-equilibrium state, respectively,
In the non-equilibrium state, the volume fraction of the gas component in the gas chamber is acquired once at each preset time interval, and the volume fractions acquired adjacent three times are set as one set of collected data, in the order of time, Including sequentially making the three volume fractions in the collected data of each set the volume fractions of the gas components in the gas chamber at the first time point, the second time point, and the third time point,
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 the volume fraction prediction formula, the inside of the gas chamber in the equilibrium state is calculated. Calculating the volume fraction of gas components is
Collection of each set 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 the volume fraction prediction formula in the collected data of each set Calculating the volume fractions of the gas components in the gas chamber at equilibrium corresponding to the data,
Obtaining an average value of the volume fractions of the gas components in the gas chamber in the equilibrium state corresponding to the collected data of each set, and using the average value as the volume fraction of the gas components in the gas chamber in the equilibrium state ,
The method for predicting a dissolved gas volume fraction in oil according to claim 1. After the average value and the volume fraction of the gas component in the gas chamber in the equilibrium state,
According to the volume fraction of each gas component in the gas chamber in equilibrium, online analysis of dissolved gas in oil,
Further adjusting the preset time interval according to an online analysis result of dissolved gas in oil,
The method for predicting a dissolved gas volume fraction in oil according to claim 4. A device for predicting a dissolved gas volume fraction in oil,
An acquisition module for acquiring the volume fractions of the gas components in the gas chamber at the first time point, the second time point, and the third time point in the non-equilibrium state, respectively. The interval between the two time points is equal to the interval between the second time point and the third time point, and the gas in the gas chamber passes through the oil/gas separation membrane into the oil of the oil-filled power equipment. An acquisition module obtained by separating the dissolved gas of
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 the volume fraction prediction formula, the inside of the gas chamber in the equilibrium state is calculated. A processing module for calculating a volume fraction of a gas component, and a device for predicting a dissolved gas volume fraction in the oil. A device for predicting a dissolved gas volume fraction in oil,
The volume fraction prediction formula is

And
In the formula, C _i ^max is a volume fraction of the gas component in the gas chamber in the equilibrium state, C _i(n−1) is a volume fraction corresponding to the first time point, and C _in is , The volume fraction corresponding to the second time point, and C _i(n+1) is the volume fraction corresponding to the third time point, the apparatus for predicting a dissolved gas volume fraction in oil. Specifically, the calculation process of the volume fraction prediction formula is as follows.
Volume fraction of gas components in gas chamber during membrane separation process of dissolved gas in oil:

By
Where b is the diffusion coefficient, t is the time after the start of permeation, C _i is the volume fraction of the gas component in the gas chamber at t,
The relational expression 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,
In the formula, 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 , and C _in is t _n . Is the volume fraction of the gas component in the gas chamber at
Intermediate formula according to the above relational expression:

Is obtained,
Where Δt=t _n −t _n−1 =t _n+1 −t _n , and 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 device for predicting a dissolved gas volume fraction in oil according to claim 7. A terminal device including a memory, a processor, and a computer program stored in the memory and executable by the processor,
6. The terminal device which implements the steps of the method according to any one of claims 1 to 5 when the processor executes the computer program. A computer-readable storage medium for storing a computer program,
6. A computer-readable storage medium that implements the steps of the method according to any one of claims 1-5 when the computer program is executed by a processor.

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