Insulating gas purity detection circuit, method, device and equipment and storage medium

Abstract

The invention relates to the technical field of insulating gas component detection, in particular to an insulating gas purity detection circuit, method, device and equipment and a storage medium. The embodiment of the invention discloses an insulating gas purity detection method, which comprises the following steps of: firstly, acquiring a plurality of test data sets, and then for each test data set, acquiring a plurality of test data sets; determining comprehensive gas thermal conductivity according to a heating wire temperature rise equation so as to obtain a plurality of comprehensive gas thermal conductivities; and finally, determining the purity of the insulating gas according to the plurality of comprehensive gas thermal conductivities, the test starting temperature corresponding to the comprehensive gas thermal conductivities and the thermal conductivities of the plurality of gases at the preset temperature. According to the embodiment of the invention, the comprehensive thermal conductivity is determined from the temperature rise curve, and the purity of the insulating gas is determined based on the total thermal conductivity at different test initial temperatures, so that compared with a traditional thermal conductivity method for determining the purity of the gas by estimating the thermal conductivity of other gases except the insulating gas, the result is more accurate and reliable.

Description

Technical Field

[0001] The present invention relates to the technical field of insulating gas composition detection, and particularly to a circuit, method, device, equipment and storage medium for detecting the purity of insulating gas. Background Art

[0002] Insulating gas refers to a gas that is non-conductive or has extremely weak conductivity, and plays an important insulating role in electrical equipment. In gas-insulated switchgear (GIS), sulfur hexafluoride is the most widely used. Sulfur hexafluoride is a colorless, odorless, non-toxic and non-flammable inert gas. It has excellent insulating performance and arc extinguishing performance. Its insulation strength is about 2.5 times that of air, and its arc extinguishing ability is more than 100 times that of air.

[0003] Regular detection of sulfur hexafluoride is crucial for ensuring the safe and stable operation of equipment, protecting personnel health and the environment. The purity of sulfur hexafluoride gas is crucial for maintaining the insulation and arc extinguishing performance of electrical equipment. By detecting the purity, changes in gas quality can be detected in a timely manner and corresponding measures can be taken.

[0004] The detection of sulfur hexafluoride purity is mainly divided into gas chromatography, thermal conductivity method, and infrared spectroscopy. Among them, gas chromatography is characterized by complex operation procedures, the need for professional personnel and equipment, and infrared spectroscopy is characterized by high precision requirements for instruments and high prices, making it difficult to be used as a technical means for real-time monitoring or rapid detection.

[0005] The thermal conductivity method has the advantages of fast response speed and relatively simple operation, and is suitable for on-site rapid detection. However, the detection accuracy of this method is relatively low, the separation effect of some gases with similar thermal conductivities is poor, and it is easily affected by factors such as environmental temperature and pressure.

[0006] Based on this, it is necessary to develop and design a method for detecting the purity of insulating gas. Summary of the Invention

[0007] The embodiments of the present invention provide a circuit, method, device, equipment and storage medium for detecting the purity of insulating gas, which are used to solve the problem of relatively low detection accuracy of the thermal conductivity method for detecting gas purity in the prior art.

[0008] In a first aspect, the embodiments of the present invention provide a circuit for detecting the purity of insulating gas, including: a triode, a filter capacitor, a heating wire, a sampling resistor, and a processor;

[0009] The base of the triode is electrically connected to the processor. The emitter of the triode is electrically connected to the first end of the filter capacitor and the first end of the heating wire. The second end of the heating wire is electrically connected to the first end of the sampling resistor. The second end of the sampling resistor is electrically connected to the second end of the filter capacitor. The first end of the sampling resistor and the first end of the filter capacitor are respectively electrically connected to the current sampling terminal and the voltage sampling terminal of the processor;

[0010] When the processor receives the voltage sampling data and the current sampling data, the processor outputs a base control signal that makes the heating power of the heating wire constant according to the voltage sampling data and the current sampling data;

[0011] When the processor receives a plurality of test arrays, the processor outputs an indication of the purity of the insulating gas according to the plurality of test arrays, where the test array includes voltage sampling data, current sampling data, and a plurality of factor data affecting the temperature of the heating wire.

[0012] In a second aspect, an embodiment of the present invention provides a method for detecting the purity of an insulating gas, including: applied to the insulating gas purity detection circuit as described in the first aspect, the method for detecting the purity of the insulating gas includes:

[0013] Obtain a plurality of test data sets, where each test data set includes a plurality of first test arrays, the first test array includes voltage sampling data, current sampling data, and sampling time, and each test data set corresponds to a test starting temperature;

[0014] For each test data set, determine the comprehensive gas thermal conductivity according to the heating wire temperature rise equation, so as to obtain a plurality of comprehensive gas thermal conductivities, where each comprehensive gas thermal conductivity corresponds to a test starting temperature;

[0015] Determine the purity of the insulating gas according to the plurality of comprehensive gas thermal conductivities, the test starting temperatures corresponding to the comprehensive gas thermal conductivities, and the thermal conductivities of various gases at a predetermined temperature.

[0016] In a possible implementation manner, obtaining the test data set includes:

[0017] Sample and enclose a sample gas of a predetermined volume;

[0018] After the temperature of the sample gas is uniform and stable, use the temperature of the sample gas as the test starting temperature;

[0019] Heat the heating wire with a constant heating power and make the sample gas flow through the heating wire at a predetermined gas flow rate;

[0020] Synchronously sample the heating voltage and heating current, and construct the obtained voltage sampling data, current sampling data, and sampling time into a first test array;

[0021] Construct multiple first test arrays into a test data set.

[0022] In a possible implementation manner, for each test data set, determining the comprehensive gas thermal conductivity according to the heating wire temperature rise equation includes:

[0023] Construct the voltage sampling data and current sampling data extracted from the first test array into a sampling pair;

[0024] Determine multiple heating wire resistances according to multiple sampling pairs;

[0025] Determine multiple heating wire temperatures according to the multiple heating wire resistances and the relationship between the heating wire resistance and temperature, where each heating wire temperature corresponds to a first test array;

[0026] Fit the heating wire temperature rise equation according to the test start temperature corresponding to the test data set, the multiple heating wire temperatures, and the sampling time of the multiple first test arrays, so as to determine the comprehensive gas thermal conductivity.

[0027] In a possible implementation manner, the heating wire temperature rise equation is:

[0028]

[0029] In the formula, T is the heating wire temperature, P is the heating wire power, e is the natural constant, t is the time variable, T 0 is the start temperature, α is the temperature rise constant, λ is the thermal conductivity, p is the gas pressure, and V is the gas volume.

[0030] In a possible implementation manner, the fitting of the heating wire temperature rise equation according to the test start temperature corresponding to the test data set, the multiple heating wire temperatures, and the sampling time of the multiple first test arrays, so as to determine the comprehensive gas thermal conductivity, includes:

[0031] Obtain multiple first thermal conductivities;

[0032] Construct the multiple heating wire temperatures into a temperature observation array;

[0033] Substitute the test start temperature corresponding to the test data set into the heating wire temperature rise equation to obtain a first intermediate equation;

[0034] Substitute the multiple first thermal conductivities into the heating wire temperature rise equation respectively to obtain multiple second intermediate equations;

[0035] For each second intermediate equation, substitute the sampling times of multiple first test arrays in the test dataset into the second intermediate equation in sequence, and construct the obtained heating wire temperature estimation values into a temperature estimation value array;

[0036] Determine multiple mean absolute percentage errors according to the temperature observation array and multiple temperature estimation value arrays, where each mean absolute percentage error corresponds to a second intermediate equation;

[0037] Add the multiple mean absolute percentage errors to multiple error queues respectively, where each error queue corresponds to a second intermediate equation;

[0038] If there is no error less than the error threshold among the multiple mean absolute percentage errors, adjust the multiple first thermal conductivities according to the multiple error queues, and jump to the step of substituting the multiple first thermal conductivities into the heating wire temperature rise equation respectively to obtain multiple second intermediate equations;

[0039] Otherwise, take the minimum value of the multiple mean absolute percentage errors as the target value, and take the thermal conductivity of the second intermediate equation corresponding to the target as the comprehensive gas thermal conductivity.

[0040] In a possible implementation manner, the determining the purity of the insulating gas according to the multiple comprehensive gas thermal conductivities, the test start temperatures corresponding to the comprehensive gas thermal conductivities, and the thermal conductivities of various gases at a predetermined temperature includes:

[0041] Obtain multiple thermal conductivity vectors, where each thermal conductivity vector corresponds to a test start temperature, and the thermal conductivity vector is constructed according to the thermal conductivities of various gases at a predetermined temperature;

[0042] Construct the multiple comprehensive gas thermal conductivities into a comprehensive thermal conductivity vector;

[0043] Construct the multiple thermal conductivity vectors into a thermal conductivity matrix;

[0044] Construct an insulating gas purity equation according to the comprehensive thermal conductivity vector and the thermal conductivity matrix, where the insulating gas purity equation is:

[0045]

[0046] In the formula, Aλ m,n is the thermal conductivity of the nth gas at the mth test start temperature, C n is the purity of the nth gas, λ m is the comprehensive gas thermal conductivity at the mth test start temperature;

[0047] Solve the insulating gas purity equation to obtain the purity of the insulating gas.

[0048] In a third aspect, an embodiment of the present invention provides an insulating gas purity detection device for implementing the insulating gas purity detection method described in the second aspect above or any possible implementation manner of the second aspect. The insulating gas purity detection device includes:

[0049] A test data acquisition module for acquiring a plurality of test data sets. Each test data set includes a plurality of first test arrays. The first test array includes voltage sampling data, current sampling data, and sampling time. Each test data set corresponds to a test starting temperature;

[0050] A comprehensive thermal conductivity determination module for, for each test data set, determining the comprehensive gas thermal conductivity according to the heating wire temperature rise equation, thereby obtaining a plurality of comprehensive gas thermal conductivities. Each comprehensive gas thermal conductivity corresponds to a test starting temperature;

[0051] And,

[0052] An insulating gas purity determination module for determining the purity of the insulating gas according to the plurality of comprehensive gas thermal conductivities, the test starting temperatures corresponding to the comprehensive gas thermal conductivities, and the thermal conductivities of various gases at a predetermined temperature.

[0053] In a fourth aspect, an embodiment of the present invention provides an electronic device including a memory and a processor. A computer program that can run on the processor is stored in the memory. When the processor executes the computer program, the steps of the method described in the second aspect above or any possible implementation manner of the second aspect are implemented.

[0054] In a fifth aspect, an embodiment of the present invention provides a computer-readable storage medium storing a computer program. When the computer program is executed by a processor, the steps of the method described in the second aspect above or any possible implementation manner of the second aspect are implemented.

[0055] The beneficial effects of the embodiment of the present invention compared with the prior art are:

[0056] An embodiment of the present invention discloses a method for detecting the purity of an insulating gas. First, a plurality of test data sets are obtained. Each test data set includes a plurality of first test arrays. The first test array includes voltage sampling data, current sampling data, and sampling time. Each test data set corresponds to a test starting temperature. Then, for each test data set, the comprehensive gas thermal conductivity is determined according to the heating wire temperature rise equation, so as to obtain a plurality of comprehensive gas thermal conductivities. Each comprehensive gas thermal conductivity corresponds to a test starting temperature. Finally, according to the plurality of comprehensive gas thermal conductivities, the test starting temperatures corresponding to the comprehensive gas thermal conductivities, and the thermal conductivities of various gases at a predetermined temperature, the purity of the insulating gas is determined. By determining the temperature rise curve according to the voltage across the heating wire and the current flowing through it at a predetermined heating power, determining the comprehensive thermal conductivity from the temperature rise curve, and then determining the purity of the insulating gas based on the total thermal conductivity at different test starting temperatures, the method of the embodiment of the present invention is more accurate and reliable than the traditional thermal conductivity method that estimates the thermal conductivity of other gases except the insulating gas to determine the gas purity. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0058] Figure 1 is the schematic circuit diagram of the insulating gas purity detection provided by the embodiment of the present invention;

[0059] Figure 2 is the flowchart of the insulating gas purity detection method provided by the embodiment of the present invention;

[0060] Figure 3 is the functional block diagram of the insulating gas purity detection device provided by the embodiment of the present invention;

[0061] Figure 4 is the functional block diagram of the electronic device provided by the embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0062] In the following description, specific details such as specific system structures and technologies are proposed for the purpose of illustration rather than limitation, so as to thoroughly understand the embodiments of the present invention. However, those skilled in the art should clearly understand that the present invention can also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, and methods are omitted to avoid unnecessary details from interfering with the description of the present invention.

[0063] To make the objectives, technical solutions, and advantages of the present invention clearer, the following will explain through specific embodiments in conjunction with the accompanying drawings.

[0064] The following details the embodiments of the present invention. This example is implemented on the premise of the technical solution of the present invention, providing detailed implementation manners and specific operation procedures. However, the protection scope of the present invention is not limited to the following embodiments.

[0065] Figure 1 It is the schematic diagram of the insulating gas purity detection circuit provided by the first aspect of the embodiment of the present invention.

[0066] An insulating gas purity detection circuit includes: a triode, a filtering capacitor, a heating wire, a sampling resistor, and a processor;

[0067] The base of the triode is electrically connected to the processor. The emitter of the triode is electrically connected to the first end of the filtering capacitor and the first end of the heating wire. The second end of the heating wire is electrically connected to the first end of the sampling resistor. The second end of the sampling resistor is electrically connected to the second end of the filtering capacitor. The first end of the sampling resistor and the first end of the filtering capacitor are respectively electrically connected to the current sampling terminal and the voltage sampling terminal of the processor;

[0068] When the processor receives the voltage sampling data and the current sampling data, the processor outputs a base control signal that makes the heating power of the heating wire constant according to the voltage sampling data and the current sampling data;

[0069] When the processor receives multiple test arrays, the processor outputs an indication of the insulating gas purity according to the multiple test arrays, where the test arrays include voltage sampling data, current sampling data, and multiple factor data affecting the temperature of the heating wire.

[0070] Exemplarily, as Figure 1 shown, the base of the triode Q1 is connected to a control output terminal of the processor 101. The collector of the triode Q1 is electrically connected to the positive pole of the power supply. The emitter of the triode Q1 is electrically connected to one end of the heating wire R1. The other end of the heating wire R1 is electrically connected to one end of the sampling resistor R2. The other end of the sampling resistor R2 is grounded. In addition, a filtering capacitor C1 is connected in parallel at both ends of the series circuit of the heating wire R1 and the sampling resistor R2.

[0071] The processor 101 adjusts the output voltage of the triode Q1 by controlling the duty cycle of the control terminal connected to the base of the triode Q1. Moreover, since the voltage at the emitter terminal of the triode Q1 and the voltage of the sampling resistor R2 are respectively fed back to the processor 101, the processor 101 can know the sampling voltage and sampling current of the heating wire R1, and further calculate the actual output power of the heating wire R1.

[0072] The present invention aims to control the heating power of the heating wire to a constant value. Based on this constant heating power and the temperature change curve of the heating wire, the comprehensive gas thermal conductivity is obtained. Then, based on the thermal conductivities of different gases and the comprehensive gas thermal conductivity, the purity of the insulating gas is determined. The embodiments of the present invention are described in detail from the second aspect.

[0073] Figure 2 It is a flowchart of the insulating gas purity detection method provided in the second aspect of the embodiments of the present invention.

[0074] As Figure 2 shown, it shows the implementation flowchart of the insulating gas purity detection method provided in the embodiments of the present invention, which is described in detail as follows:

[0075] In step 201, a plurality of test data sets are obtained. Each test data set includes a plurality of first test arrays. The first test array includes voltage sampling data, current sampling data, and sampling time. Each test data set corresponds to a test starting temperature.

[0076] In some embodiments, obtaining the test data set includes:

[0077] Sampling and enclosing a sample gas in a predetermined volume;

[0078] After the temperature of the sample gas is uniform and stable, the temperature of the sample gas is used as the test starting temperature;

[0079] Heating the heating wire with a constant heating power and allowing the sample gas to flow through the heating wire at a predetermined gas flow rate;

[0080] Synchronously sampling the heating voltage and heating current, and constructing the obtained voltage sampling data, current sampling data, and sampling time into a first test array;

[0081] Constructing a plurality of first test arrays into a test data set.

[0082] Exemplarily, in some application scenarios, the gas is sampled and enclosed in a circulation pipeline. The circulation pipeline is heat-insulated from the outside. There are devices in the circulation pipeline that can control the gas flow rate, measure the gas flow temperature, and measure the air pressure of the sample gas in the closed pipeline.

[0083] When conducting a test, the enclosed gas is first temperature - homogenized, and the air temperature and air pressure at this moment are recorded (the air temperature is used as the starting temperature of the test). Then, the heating wire is controlled to heat at a constant power, and the sample gas is controlled to flow through the heating wire at a predetermined flow rate. Next, the processor samples the voltage across the heating wire and the current flowing through it at a predetermined time node. These data, together with the sampling time, are constructed into a first test array. By repeating the above steps, a test data set composed of multiple first test arrays is obtained.

[0084] The process of obtaining a test data set based on a certain starting temperature of the test is described in detail above. In fact, other data sets are also obtained in the same way, except that the corresponding starting temperatures of the tests are different.

[0085] In step 202, for each test data set, the comprehensive gas thermal conductivity is determined according to the heating wire temperature - rise equation, thereby obtaining multiple comprehensive gas thermal conductivities. Among them, each comprehensive gas thermal conductivity corresponds to a starting temperature of the test.

[0086] In some embodiments, for each test data set, determining the comprehensive gas thermal conductivity according to the heating wire temperature - rise equation includes:

[0087] Constructing a sampling pair from the voltage sampling data and current sampling data extracted from the first test array;

[0088] Determining multiple heating wire resistances according to multiple sampling pairs;

[0089] Determining multiple heating wire temperatures according to the multiple heating wire resistances and the relationship between the heating wire resistance and temperature, where each heating wire temperature corresponds to a first test array;

[0090] Fitting the heating wire temperature - rise equation according to the starting temperature of the test data set corresponding to the test, the multiple heating wire temperatures, and the sampling time of the multiple first test arrays, thereby determining the comprehensive gas thermal conductivity.

[0091] In some embodiments, the heating wire temperature - rise equation is:

[0092]

[0093] In the formula, T is the heating wire temperature, P is the heating wire power, e is the natural constant, t is the time variable, T 0 is the starting temperature, α is the temperature - rise constant, λ is the thermal conductivity, p is the gas pressure, and V is the gas volume.

[0094] In some embodiments, fitting the heating wire temperature - rise equation according to the starting temperature of the test data set corresponding to the test, the multiple heating wire temperatures, and the sampling time of the multiple first test arrays, thereby determining the comprehensive gas thermal conductivity, includes:

[0095] Obtain multiple first thermal conductivities;

[0096] Construct the temperatures of the multiple heating wires into a temperature observation array;

[0097] Substitute the test start temperature corresponding to the test data set into the heating wire temperature rise equation to obtain a first intermediate equation;

[0098] Substitute the multiple first thermal conductivities into the heating wire temperature rise equation respectively to obtain multiple second intermediate equations;

[0099] For each second intermediate equation, substitute the sampling times of multiple first test arrays in the test data set into the second intermediate equation in sequence, and construct the obtained heating wire temperature estimation values into a temperature estimation value array;

[0100] Determine multiple mean absolute percentage errors according to the temperature observation array and multiple temperature estimation value arrays, where each mean absolute percentage error corresponds to a second intermediate equation;

[0101] Add the multiple mean absolute percentage errors to multiple error queues respectively, where each error queue corresponds to a second intermediate equation;

[0102] If there is no error less than the error threshold among the multiple mean absolute percentage errors, adjust the multiple first thermal conductivities according to the multiple error queues, and jump to the step of substituting the multiple first thermal conductivities into the heating wire temperature rise equation respectively to obtain multiple second intermediate equations;

[0103] Otherwise, take the minimum value of the multiple mean absolute percentage errors as the target value, and take the thermal conductivity of the second intermediate equation corresponding to the target as the comprehensive gas thermal conductivity.

[0104] Exemplarily, in the embodiment of the present invention, the comprehensive gas thermal conductivity is obtained by combining the test data set with the heating wire temperature rise equation. Actually, each test data set will obtain a comprehensive gas thermal conductivity corresponding to the test start temperature.

[0105] The reason for obtaining multiple comprehensive gas thermal conductivities is that the gas thermal conductivity is affected by multiple factors, and the more significant one is the gas temperature. That is to say, the gas shows different thermal conductivities under different temperature conditions, and moreover, the change of this thermal conductivity with temperature is not a simple linear relationship, and this non-linearity is more obvious at higher temperatures.

[0106] The gas components in the insulating environment, or the possible components, can be known. Based on the thermal conductivities of different gases at different temperatures, it is possible to more accurately determine the gas purity. That is, as proposed in the embodiments of the present invention, by obtaining multiple comprehensive gas thermal conductivities and combining the differences in gas thermal conductivities at different temperatures, a system of equations is constructed to obtain a more accurate purity of the insulating gas.

[0107] To achieve the above object, in the embodiments of the present invention, voltage sampling data and current sampling data are extracted from the first test array, the resistance value of the heating wire is calculated through the two data, and based on the temperature-resistance curve of the heating wire, the temperature of the heating wire is determined. In this way, for each first test array, a heating wire temperature and the corresponding time of this temperature are obtained. By testing the starting temperature, the heating wire temperature, and the corresponding time of this temperature, the heating wire temperature rise equation can be fitted. The temperature rise equation is:

[0108]

[0109] In the formula, T is the heating wire temperature, P is the heating wire power, e is the natural constant, t is the time variable, T 0 is the starting temperature, α is the temperature rise constant, λ is the thermal conductivity, p is the gas pressure, and V is the gas volume.

[0110] Fitting the heating wire temperature rise equation is actually a process of determining the coefficients of the temperature rise equation. In the above equation, except for the thermal conductivity, the other parameters can be obtained through observation. Therefore, the purpose of fitting is to make the heating wire temperature and the corresponding time of this temperature as close as possible to the temperature curve expressed by the temperature rise equation.

[0111] There are various fitting methods. For example, the least squares method is used. The embodiments of the present invention adopt an improved method to improve the efficiency of the fitting process through parallel processing.

[0112] Specifically, multiple possible thermal conductivities are randomly initialized and substituted into the above equation to form multiple second intermediate equations. Then, the sampling times of the first test array are sequentially input into the above second intermediate equations. The temperature corresponding to the sampling time output by the second intermediate equations and the temperature obtained through the first test array are used to calculate the mean absolute percentage error, which is expressed by the formula:

[0113]

[0114] The above equation is a general equation for calculating the mean absolute percentage error. In the embodiments of the present invention, y i is the i-th temperature obtained through the first test array, and is the i-th temperature obtained through the second intermediate equation. The mean absolute percentage error is added to the error queue. In other words, the above steps are performed for each second intermediate equation, and multiple error queues are obtained.

[0115] If there is a case where the mean absolute percentage error is less than the error threshold, then the thermal conductivity in the second intermediate equation corresponding to the minimum value among those less than the error threshold is used as the comprehensive thermal conductivity. Otherwise, based on the multiple mean absolute percentage errors, the optimal second intermediate equation is found, and then the optimal historical optimal second intermediate equation is found from the error queue. Combining the two optimal second intermediate equations, the thermal conductivity substituted into the second intermediate equation is modified, and so on until the above reciprocation termination condition (there is a case where the mean absolute percentage error is less than the error threshold) is satisfied.

[0116] In step 203, based on the multiple comprehensive gas thermal conductivities, the test start temperatures corresponding to the comprehensive gas thermal conductivities, and the thermal conductivities of various gases at a predetermined temperature, the purity of the insulating gas is determined.

[0117] In some embodiments, the determining the purity of the insulating gas based on the multiple comprehensive gas thermal conductivities, the test start temperatures corresponding to the comprehensive gas thermal conductivities, and the thermal conductivities of various gases at a predetermined temperature includes:

[0118] Obtain multiple thermal conductivity vectors, where each thermal conductivity vector corresponds to a test start temperature, and the thermal conductivity vector is constructed based on the thermal conductivities of various gases at a predetermined temperature;

[0119] Construct the multiple comprehensive gas thermal conductivities into a comprehensive thermal conductivity vector;

[0120] Construct the multiple thermal conductivity vectors into a thermal conductivity matrix;

[0121] Based on the comprehensive thermal conductivity vector and the thermal conductivity matrix, construct an insulating gas purity equation, where the insulating gas purity equation is:

[0122]

[0123] In the formula, Aλ m,n is the thermal conductivity of the n-th gas at the m-th test start temperature, C n is the purity of the n-th gas, λ m is the comprehensive gas thermal conductivity at the m-th test start temperature;

[0124] Solve the insulating gas purity equation to obtain the purity of the insulating gas.

[0125] Exemplarily, as described above, the thermal conductivity of a gas has a strong correlation with the temperature point at which the gas is located. Given the known gases that may be doped into the insulating gas, by measuring the thermal conductivities of various gases at a predetermined temperature, a thermal conductivity vector can be constructed. In other words, the thermal conductivity vector is a combination of the thermal conductivities of various gases corresponding to a certain temperature point. Since the embodiments of the present invention are based on a preset test starting temperature, each thermal conductivity vector corresponds to such a test starting temperature.

[0126] Construct multiple thermal conductivity vectors into a thermal conductivity matrix (each thermal conductivity vector serves as a row vector), and construct the comprehensive gas thermal conductivity into a column vector. Based on the temperature correspondence, the following equation can be constructed:

[0127]

[0128] In the formula, Aλ m,n is the thermal conductivity of the nth gas at the mth test starting temperature, C n is the purity of the nth gas, and λ m is the comprehensive gas thermal conductivity at the mth test starting temperature.

[0129] By solving the above equation, concentration information of various gases including the purity of the insulating gas can be obtained.

[0130] In the embodiment of the method for detecting the purity of the insulating gas of the present invention, first, multiple test data sets are obtained. Each test data set includes multiple first test arrays, and the first test array includes voltage sampling data, current sampling data, and sampling time. Each test data set corresponds to a test starting temperature. Then, for each test data set, the comprehensive gas thermal conductivity is determined according to the heating wire temperature rise equation, thereby obtaining multiple comprehensive gas thermal conductivities, where each comprehensive gas thermal conductivity corresponds to a test starting temperature. Finally, based on the multiple comprehensive gas thermal conductivities, the test starting temperatures corresponding to the comprehensive gas thermal conductivities, and the thermal conductivities of various gases at a predetermined temperature, the purity of the insulating gas is determined. In the embodiment of the present invention, by determining the temperature rise curve according to the voltage across the heating wire and the current flowing through it at a predetermined heating power, the comprehensive thermal conductivity is determined from the temperature rise curve, and then the purity of the insulating gas is determined based on the total thermal conductivity at different test starting temperatures. Compared with the traditional thermal conductivity method that estimates the thermal conductivity of other gases except the insulating gas to determine the gas purity, the result is more accurate and reliable.

[0131] It should be understood that the magnitudes of the sequence numbers of the steps in the above embodiments do not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.

[0132] The following are the device embodiments of the present invention. For details not described in detail herein, reference may be made to the corresponding method embodiments above.

[0133] Figure 3 It is a functional block diagram of an insulating gas purity detection device provided in the third aspect of the embodiment of the present invention. Referring to Figure 3 , the insulating gas purity detection device includes: a test data acquisition module 301, a comprehensive thermal conductivity determination module 302, and an insulating gas purity determination module 303, where:

[0134] The test data acquisition module 301 is used to acquire a plurality of test data sets. Each test data set includes a plurality of first test arrays, and each first test array includes voltage sampling data, current sampling data, and sampling time. Each test data set corresponds to a test start temperature;

[0135] The comprehensive thermal conductivity determination module 302 is used to determine the comprehensive gas thermal conductivity for each test data set according to the heating wire temperature rise equation, so as to obtain a plurality of comprehensive gas thermal conductivities. Each comprehensive gas thermal conductivity corresponds to a test start temperature;

[0136] The insulating gas purity determination module 303 is used to determine the purity of the insulating gas according to the plurality of comprehensive gas thermal conductivities, the test start temperatures corresponding to the comprehensive gas thermal conductivities, and the thermal conductivities of various gases at a predetermined temperature.

[0137] Figure 4 It is a functional block diagram of an electronic device provided in the embodiment of the present invention. As Figure 4 shown, the electronic device 4 of this embodiment includes: a processor 400 and a memory 401. A computer program 402 that can run on the processor 400 is stored in the memory 401. When the processor 400 executes the computer program 402, the steps in the above-mentioned various insulating gas purity detection methods and embodiments are implemented, such as Figure 2 the steps 201 to 203 shown.

[0138] Exemplarily, the computer program 402 can be divided into one or more modules / units. The one or more modules / units are stored in the memory 401 and executed by the processor 400 to complete the present invention.

[0139] The electronic device 4 can be a computing device such as a desktop computer, a notebook, a palm computer, and a cloud server. The electronic device 4 may include, but is not limited to, a processor 400 and a memory 401. Those skilled in the art can understand that Figure 4This is only an example of the electronic device 4 and does not constitute a limitation on the electronic device 4. It may include more or fewer components than those shown in the figure, or combine certain components, or different components. For example, the electronic device 4 may further include input / output devices, network access devices, buses, etc.

[0140] The so-called processor 400 may be a central processing unit (CPU), or may also be other general-purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.

[0141] The memory 401 may be an internal storage unit of the electronic device 4, such as the hard disk or memory of the electronic device 4. The memory 401 may also be an external storage device of the electronic device 4, such as a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, etc. equipped on the electronic device 4. Further, the memory 401 may also include both the internal storage unit and the external storage device of the electronic device 4. The memory 401 is used to store the computer program 402 and other programs and data required by the electronic device 4. The memory 401 may also be used to temporarily store data that has been output or is to be output.

[0142] Those skilled in the art can clearly understand that, for the convenience and brevity of description, only the above-mentioned division of each functional unit and module is used as an example. In actual applications, the above functions can be allocated to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. Each functional unit and module in the embodiments can be integrated into a processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of a software functional unit. In addition, the specific names of each functional unit and module are only for the convenience of mutual distinction and do not limit the protection scope of this application. The specific working processes of the units and modules in the above system can refer to the corresponding processes in the foregoing method embodiments and will not be elaborated herein.

[0143] In the above embodiments, the descriptions of each embodiment have their own emphases. For the parts not detailed or recorded in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0144] Those of ordinary skill in the art can realize that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be implemented by electronic hardware, or by a combination of computer software and electronic hardware. Whether these functions are executed in hardware or software depends on the specific application and design constraints of the technical solution. Professional technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present invention.

[0145] In the embodiments provided by the present invention, it should be understood that the disclosed device / electronic device and method can be implemented in other ways. For example, the device / electronic device embodiments described above are only illustrative. For example, the division of the module or unit is only a logical function division. In actual implementation, there can be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed coupling or direct coupling or communication connection to each other can be through some interfaces. The indirect coupling or communication connection of the device or unit can be in electrical, mechanical or other forms.

[0146] The unit described as a separated component may or may not be physically separated, and the component displayed as a unit may or may not be a physical unit, that is, it can be located in one place, or can be distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0147] In addition, each functional unit in various embodiments of the present invention may be integrated into one processing unit, may exist separately as individual physical units, or two or more units may be integrated into one unit. The above-mentioned integrated units may be implemented in the form of hardware or in the form of software functional units.

[0148] If the integrated module / unit is implemented in the form of a software functional unit and sold or used as an independent product, it may be stored in a computer-readable storage medium. Based on such understanding, all or part of the processes in the above-mentioned implementation methods of the present invention can also be completed by instructing relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium. When the computer program is executed by a processor, the steps of the above-mentioned various method and device embodiments can be implemented. Among them, the computer program includes computer program code, and the computer program code can be in the form of source code, object code, executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disc, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signal, telecommunication signal, and software distribution medium, etc.

[0149] The above-mentioned embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. An insulating gas purity detection circuit, characterized in that: include: Transistor, filter capacitor, heating wire, sampling resistor and processor; The base of the transistor is electrically connected to the processor, the emitter of the transistor is electrically connected to the first end of the filter capacitor and the first end of the heating wire, the second end of the heating wire is electrically connected to the first end of the sampling resistor, the second end of the sampling resistor is electrically connected to the second end of the filter capacitor, and the first end of the sampling resistor and the first end of the filter capacitor are electrically connected to the current sampling terminal and the voltage sampling terminal of the processor respectively; When the processor receives the voltage sampling data and the current sampling data, the processor outputs a base control signal that makes the heating power of the heating wire constant according to the voltage sampling data and the current sampling data; When the processor receives a plurality of test arrays, the processor outputs an indication of the purity of the insulating gas according to the plurality of test arrays, wherein the test arrays include voltage sampling data, current sampling data, and data of a plurality of factors affecting the temperature of the heating wire.

2. A method for detecting the purity of insulating gas, characterized in that: Applied to the insulating gas purity detection circuit as claimed in claim 1, the insulating gas purity detection method comprises: Acquire multiple test data sets, wherein each test data set includes multiple first test arrays, the first test arrays include voltage sampling data, current sampling data and sampling time, and each test data set corresponds to a test starting temperature; For each test data set, the comprehensive gas thermal conductivity is determined according to the heating wire temperature rise equation, thereby obtaining a plurality of comprehensive gas thermal conductivities, wherein each comprehensive gas thermal conductivity corresponds to a test starting temperature; The purity of the insulating gas is determined based on the multiple comprehensive gas thermal conductivities, the test start temperature corresponding to the comprehensive gas thermal conductivities, and the thermal conductivities of the multiple gases at a predetermined temperature.

3. The insulating gas purity detection method according to claim 2, characterized in that: Obtaining the test dataset includes: Take samples and seal a predetermined volume of sample gas; After the temperature of the sample gas is uniform and stable, the temperature of the sample gas is used as the test starting temperature; Heating the heating wire with a constant heating power, and allowing the sample gas to flow through the heating wire at a predetermined gas flow rate; Synchronously sampling the heating voltage and the heating current, and constructing the obtained voltage sampling data, current sampling data and sampling time into a first test array; A plurality of first test arrays are constructed as a test data set.

4. The insulating gas purity detection method according to claim 2, characterized in that: For each test data set, the comprehensive gas thermal conductivity is determined according to the heating wire temperature rise equation, including: constructing the voltage sampling data and the current sampling data extracted from the first test array into a sampling pair; Determine multiple heating wire resistance values ​​according to multiple sampling pairs; Determine a plurality of heating wire temperatures according to the plurality of heating wire resistance values ​​and the relationship between the heating wire resistance value and the temperature, wherein each heating wire temperature corresponds to a first test array; The heating wire temperature rise equation is fitted according to the test start temperature corresponding to the test data set, the multiple heating wire temperatures and the sampling time of the multiple first test arrays, so as to determine the comprehensive gas thermal conductivity.

5. The insulating gas purity detection method according to claim 4, characterized in that: The heating wire temperature rise equation is: Where T is the temperature of the heating wire, P is the power of the heating wire, e is a natural constant, t is a time variable, T0 is the starting temperature, α is the temperature rise constant, λ is the thermal conductivity, p is the gas pressure, and V is the gas volume.

6. The insulating gas purity detection method according to claim 4, characterized in that: The method of fitting the heating wire temperature rise equation according to the test start temperature corresponding to the test data set, the multiple heating wire temperatures and the sampling time of the multiple first test arrays to determine the comprehensive gas thermal conductivity includes: obtaining a plurality of first thermal conductivities; constructing the multiple heating wire temperatures into a temperature observation array; Substituting the test start temperature corresponding to the test data set into the heating wire temperature rise equation to obtain a first intermediate equation; Substituting the plurality of first thermal conductivities into the heating wire temperature rise equation respectively to obtain a plurality of second intermediate equations; For each second intermediate equation, the sampling times of the plurality of first test arrays in the test data set are sequentially substituted into the second intermediate equation, and the obtained estimated values ​​of the heating wire temperature are constructed as an array of estimated temperature values; Determine a plurality of mean absolute percentage errors according to the temperature observation array and a plurality of temperature estimation value arrays, wherein each mean absolute percentage error corresponds to a second intermediate equation; Adding the multiple mean absolute percentage errors to multiple error queues respectively, wherein each error queue corresponds to a second intermediate equation; If there is no error less than the error threshold among the multiple mean absolute percentage errors, adjusting the multiple first thermal conductivities according to the multiple error queues, and jumping to the step of substituting the multiple first thermal conductivities into the heating wire temperature rise equation respectively to obtain multiple second intermediate equations; Otherwise, the minimum value among the multiple mean absolute percentage errors is used as the target value, and the thermal conductivity of the second intermediate equation corresponding to the target is used as the comprehensive gas thermal conductivity.

7. The insulating gas purity detection method according to any one of claims 2 to 6, characterized in that: The step of determining the purity of the insulating gas according to the plurality of comprehensive gas thermal conductivities, the test start temperature corresponding to the comprehensive gas thermal conductivities, and the thermal conductivities of the plurality of gases at a predetermined temperature comprises: Acquire a plurality of thermal conductivity vectors, wherein each thermal conductivity vector corresponds to a test starting temperature, and the thermal conductivity vector is constructed according to thermal conductivities of a plurality of gases at a predetermined temperature; constructing the plurality of integrated gas thermal conductivities into an integrated thermal conductivity vector; constructing the plurality of thermal conductivity vectors into a thermal conductivity matrix; According to the comprehensive thermal conductivity vector and the thermal conductivity matrix, an insulating gas purity equation is constructed, wherein the insulating gas purity equation is: In the formula, Aλ m,n is the thermal conductivity of the nth gas at the mth test starting temperature, C n is the purity of the nth gas, λ m is the comprehensive gas thermal conductivity at the starting temperature of the mth test; The insulating gas purity equation is solved to obtain the purity of the insulating gas.

8. An insulating gas purity detection device, characterized in that: Used to implement the insulating gas purity detection method according to any one of claims 2 to 7, the insulating gas purity detection device comprises: A test data acquisition module, used to acquire multiple test data sets, wherein each test data set includes multiple first test arrays, the first test arrays include voltage sampling data, current sampling data and sampling time, and each test data set corresponds to a test starting temperature; A comprehensive thermal conductivity determination module is used to determine the comprehensive gas thermal conductivity according to the heating wire temperature rise equation for each test data set, thereby obtaining a plurality of comprehensive gas thermal conductivities, wherein each comprehensive gas thermal conductivity corresponds to a test starting temperature; as well as, The insulating gas purity determination module is used to determine the purity of the insulating gas based on the multiple comprehensive gas thermal conductivities, the test starting temperature corresponding to the comprehensive gas thermal conductivities, and the thermal conductivities of the multiple gases at a predetermined temperature.

9. An electronic device comprising a memory and a processor, wherein the memory stores a computer program that can be run on the processor, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 2 to 7 are implemented.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the method as claimed in any one of claims 2 to 7 are implemented.

Images