Detection method for directly measuring gas in transformer oil by adopting near infrared spectrum

Abstract

The invention discloses a detection method for directly measuring gas in transformer oil by adopting a near infrared spectrum, which belongs to the technical field of gas detection and comprises the following steps: turning on a near infrared spectrum detection instrument; according to the method, before oil-gas separation is carried out on the oil, deoxidation treatment is specially carried out on the oil, the follow-up separation simplicity of other gases in the oil is effectively improved, when the gases are detected, the gases are modulated by a modulator and then are irradiated to a sample pool containing a gas sample, and after the light and gas molecules interact, the detection sensitivity is improved. According to the method, spectral data are received by a light sensor and are recorded by a data acquisition unit after pre-amplification and lock-in amplification processing, through the process, the overall accuracy of the data can be improved, the data subjected to two-way amplification is not prone to being lost, and the integrity of the data can be guaranteed; and a plurality of different types of visual display processes are provided for the final result data, so that the display and propagation effects of the information and the data can be greatly improved.

Description

Technical Field

[0001] The invention belongs to the technical field of gas detection, and in particular relates to a method for directly measuring gas in transformer oil by using near infrared spectroscopy. Background Art

[0002] Near infrared spectroscopy is a non-destructive testing technology widely used in the analysis of material structure and chemical composition. Near infrared spectroscopy is a technology that measures the absorption and reflection of light by materials in the near infrared light range of 700-2500 nanometers (0.7-2.5um). Different components can be identified and quantified by analyzing spectral data. Due to the characteristics of infrared spectroscopy, it is used in many detection fields, and this technology is also needed in the detection of gas in transformer oil.

[0003] A Chinese patent (CN107490560A) discloses a near-infrared spectral absorption gas detection system, comprising: a high-frequency modulator, a frequency multiplier, a phase lock, and a gas chamber; the characteristics are: the gas chamber is arranged between a light source and an optical splitter, the infrared light emitted by the light source is collimated into parallel light by an incident lens, passes through a cylinder, and exits from an exit lens, and irradiates the optical fiber of the optical splitter, the optical signal output by the optical splitter is transmitted to a preamplifier, the optical signal is converted into a current signal and amplified, the preamplifier transmits the amplified current signal to the phase lock, the phase lock converts the amplified current signal into a DC signal output, the DC signal is input to a filter for bandpass filtering, and the filtered DC signal is sent to a signal processor for processing. The system has the advantages of high precision, good accuracy, and low detection cost. Although the current gas detection method can complete the identification and detection of gas, it does not perform the pre-amplification and phase-locked amplification processing of the optical sensor during the gas detection process, thereby failing to improve the accuracy of the detection data. At the same time, the data is prone to loss and is difficult to retrieve and requires re-testing. In addition, the final detection result of this method is not tested by a calculation test, which makes it impossible to improve the accuracy of the final detection result. The actual application effect is not good. There is an urgent need for a method for directly measuring gas in transformer oil using near-infrared spectroscopy. Summary of the invention

[0004] The purpose of the present invention is to solve the problem that although the current gas detection method can complete the identification and detection of gas, it does not perform the pre-amplification and phase-locked amplification processing of the optical sensor during the gas detection process, thereby failing to improve the accuracy of the detection data, and the data is prone to loss, etc., and is not easy to retrieve and needs to be re-detected, and the final detection result of the method is not provided with a calculation test for detection, thereby failing to improve the accuracy of the final detection result and having a poor actual application effect. A method for directly measuring gas in transformer oil using near-infrared spectroscopy is proposed.

[0005] In order to achieve the above object, the present invention adopts the following technical scheme: a method for directly measuring gas in transformer oil using near infrared spectroscopy, comprising the following steps:

[0006] S1. Turn on the near-infrared spectrum detection instrument and perform preheating operation;

[0007] S2. Setting parameters of near infrared spectrum detection instrument;

[0008] S3, setting the light source parameters;

[0009] S4. Prepare test samples and process them;

[0010] S5, placing the treated sample oil in an oil-gas separation device for treatment;

[0011] S6, sending the collected gas to a sample cell of a near infrared spectrum detection instrument;

[0012] S7, near infrared spectrum detection instrument detects gas;

[0013] S8, processing the test results;

[0014] S9. Visualize the results.

[0015] As a further description of the above technical solution:

[0016] In S1, the near infrared spectrum detection instrument is turned on and preheated for 5-10 minutes.

[0017] As a further description of the above technical solution:

[0018] In S2, the parameters of the near infrared spectrum detection instrument are set, and the set parameters include the measurement range, the number of scans and the scan interval.

[0019] As a further description of the above technical solution:

[0020] In S3, light source parameters are set, including light source intensity, spectral resolution and integration time parameters.

[0021] As a further description of the above technical solution:

[0022] In S4, a test sample is prepared and processed. The processing method is to take transformer oil, add it into a filtering system, filter it, and then place it into a deoxidation device to deoxidize it.

[0023] As a further description of the above technical solution:

[0024] In S5, the treated sample oil is placed in an oil-gas separation device for treatment, and the gas dissolved in the transformer oil is collected.

[0025] As a further description of the above technical solution:

[0026] In S6, the collected gas is uniformly delivered to the sample pool of the near-infrared spectrum detection instrument by using the gas path control unit. Before the gas is delivered, the overall air tightness of the gas path control unit is checked.

[0027] As a further description of the above technical solution:

[0028] In S7, the near-infrared spectrum detection instrument detects the gas, and the specific process is: the light source emits near-infrared light, which is modulated by the modulator and irradiated onto the sample pool containing the gas sample. After the light interacts with the gas molecules, it is received by the light sensor. After pre-amplification and phase-locked amplification processing, the data acquisition unit records the spectral data.

[0029] As a further description of the above technical solution:

[0030] In S8, the collected test results are processed and analyzed by data analysis software to obtain gas type and content data, and the data is backed up and stored. A gas adsorption test is set up and the test results are calculated. The specific process is as follows:

[0031] A1. Select the appropriate adsorbent based on the type and content of the gas obtained from the test results

[0032] A2. Place the adsorbent in the testing equipment and prepare the test color card;

[0033] A3. Introduce the test gas sample into the test equipment;

[0034] A4. Calculate the type and content of the gas by the color change of the color card;

[0035] A5. If it is inconsistent with the test result, re-test.

[0036] As a further description of the above technical solution:

[0037] In S9, the results are visualized, and the visualization method is one or more of chart display, legend display and graphic display.

[0038] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0039] In the present invention, before the oil-gas separation, the method specifically performs a deoxygenation treatment on the oil, which effectively improves the simplicity of subsequent separation of other gases in the oil, and improves the subsequent detection effect. When detecting the gas, the light is modulated by the modulator and irradiated onto the sample pool containing the gas sample. After the light interacts with the gas molecules, it is received by the light sensor. After pre-amplification and phase-locked amplification, the data acquisition unit records the spectral data. Through this process, the overall accuracy of the data can be improved, and the data after bidirectional amplification is not easily lost, which can ensure the integrity of the data. At the same time, in the method, there are multiple different types of visual display processes for the final result data, which can greatly improve the display and dissemination effect of information and data. In the end, the method is also provided with a re-inspection test, which can calculate the final detection result, so as to find errors in the detection result, which is helpful to improve the accuracy of the final detection result and improve the application effect of the method. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 The figure is a flow chart of a method for directly measuring gas in transformer oil using near infrared spectroscopy.

[0041] Figure 2 This is an experimental example of the determination of dissolved gas in transformer oil using near-infrared spectroscopy to directly measure gas in transformer oil. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] Example 1

[0044] See also Figure 1 The present invention provides a technical solution: a method for directly measuring gas in transformer oil using near infrared spectroscopy, comprising the following steps:

[0045] S1. Turn on the near-infrared spectroscopy detection instrument and perform a 5-min preheating operation;

[0046] S2. Setting parameters of the near infrared spectrum detection instrument, including the measurement range, the number of scans and the scan interval;

[0047] S3, setting the light source parameters, including light source intensity, spectral resolution and integration time parameters;

[0048] S4, prepare test samples, and process them, the processing method is, take transformer oil, add it into a filtration system, filter it, then place it into a deoxidation device, deoxidize it;

[0049] S5, placing the treated sample oil in an oil-gas separation device for treatment, and collecting the gas dissolved in the transformer oil;

[0050] S6. The collected gas is evenly delivered to the sample pool of the near-infrared spectrum detection instrument by using the gas path control unit. Before the gas is delivered, the overall air tightness of the gas path control unit is checked;

[0051] S7, near-infrared spectrum detection instrument detects gas, the specific process is: the light source emits near-infrared light, which is modulated by the modulator and irradiated onto the sample pool containing the gas sample. After the light interacts with the gas molecules, it is received by the light sensor, and after pre-amplification and phase-locked amplification processing, the data acquisition unit records the spectrum data;

[0052] S8. Process and analyze the collected test results through data analysis software to obtain gas type and content data, back up and store the data, set up a gas adsorption test, and calculate the test results. The specific process is as follows:

[0053] A1. Select the appropriate adsorbent based on the type and content of the gas obtained from the test results

[0054] A2. Place the adsorbent in the testing equipment and prepare the test color card;

[0055] A3. Introduce the test gas sample into the test equipment;

[0056] A4. Calculate the type and content of the gas by the color change of the color card;

[0057] A5. If it is inconsistent with the test results, retest;

[0058] S9. Visualize the results using legend display and graphic display.

[0059] In this embodiment, the method specifically performs a deoxygenation treatment on the oil before performing oil-gas separation on the oil, which effectively improves the ease of subsequent separation of other gases in the oil and improves the subsequent detection effect.

[0060] Example 2

[0061] See also Figure 1 The present invention provides a technical solution: a method for directly measuring gas in transformer oil using near infrared spectroscopy, comprising the following steps:

[0062] S1. Turn on the near-infrared spectroscopy detection instrument and perform a preheating operation for 8 minutes;

[0063] S2. Setting parameters of the near infrared spectrum detection instrument, including the measurement range, the number of scans and the scan interval;

[0064] S3, setting the light source parameters, including light source intensity, spectral resolution and integration time parameters;

[0065] S4, prepare test samples, and process them, the processing method is, take transformer oil, add it into a filtration system, filter it, then place it into a deoxidation device, deoxidize it;

[0066] S5, placing the treated sample oil in an oil-gas separation device for treatment, and collecting the gas dissolved in the transformer oil;

[0067] S6. The collected gas is evenly delivered to the sample pool of the near-infrared spectrum detection instrument by using the gas path control unit. Before the gas is delivered, the overall air tightness of the gas path control unit is checked;

[0068] S7, near-infrared spectrum detection instrument detects gas, the specific process is: the light source emits near-infrared light, which is modulated by the modulator and irradiated onto the sample pool containing the gas sample. After the light interacts with the gas molecules, it is received by the light sensor, and after pre-amplification and phase-locked amplification processing, the data acquisition unit records the spectrum data;

[0069] S8. Process and analyze the collected test results through data analysis software to obtain gas type and content data, back up and store the data, set up a gas adsorption test, and calculate the test results. The specific process is as follows:

[0070] A1. Select the appropriate adsorbent based on the type and content of the gas obtained from the test results

[0071] A2. Place the adsorbent in the testing equipment and prepare the test color card;

[0072] A3. Introduce the test gas sample into the test equipment;

[0073] A4. Calculate the type and content of the gas by the color change of the color card;

[0074] A5. If it is inconsistent with the test results, retest;

[0075] S9. Visualize the results using charts.

[0076] In this embodiment, when the method detects gas, the light is modulated by a modulator and then irradiated onto a sample pool containing a gas sample. After the light interacts with the gas molecules, it is received by the light sensor. After pre-amplification and phase-locked amplification, the data acquisition unit records the spectral data. Through this process, the overall accuracy of the data can be improved, and the data after bidirectional amplification is not easily lost, which can ensure the integrity of the data.

[0077] Example 3

[0078] See also Figure 1 The present invention provides a technical solution: a method for directly measuring gas in transformer oil using near infrared spectroscopy, comprising the following steps:

[0079] S1. Turn on the near-infrared spectroscopy detection instrument and perform a 10-min preheating operation;

[0080] S2. Setting parameters of the near infrared spectrum detection instrument, including the measurement range, the number of scans and the scan interval;

[0081] S3, setting the light source parameters, including light source intensity, spectral resolution and integration time parameters;

[0082] S4, prepare test samples, and process them, the processing method is, take transformer oil, add it into a filtration system, filter it, then place it into a deoxidation device, deoxidize it;

[0083] S5, placing the treated sample oil in an oil-gas separation device for treatment, and collecting the gas dissolved in the transformer oil;

[0084] S6. The collected gas is evenly delivered to the sample pool of the near-infrared spectrum detection instrument by using the gas path control unit. Before the gas is delivered, the overall air tightness of the gas path control unit is checked;

[0085] S7, near-infrared spectrum detection instrument detects gas, the specific process is: the light source emits near-infrared light, which is modulated by the modulator and irradiated onto the sample pool containing the gas sample. After the light interacts with the gas molecules, it is received by the light sensor, and after pre-amplification and phase-locked amplification processing, the data acquisition unit records the spectrum data;

[0086] S8. Process and analyze the collected test results through data analysis software to obtain gas type and content data, back up and store the data, set up a gas adsorption test, and calculate the test results. The specific process is as follows:

[0087] A1. Select the appropriate adsorbent based on the type and content of the gas obtained from the test results

[0088] A2. Place the adsorbent in the testing equipment and prepare the test color card;

[0089] A3. Introduce the test gas sample into the test equipment;

[0090] A4. Calculate the type and content of the gas by the color change of the color card;

[0091] A5. If it is inconsistent with the test results, retest;

[0092] S9. Visualize the results using charts.

[0093] In this embodiment, in this method, the final result data has a variety of different types of visualization display processes, which can greatly improve the display and dissemination effect of information and data.

[0094] Example 4

[0095] See also Figure 1 The present invention provides a technical solution: a method for directly measuring gas in transformer oil using near infrared spectroscopy, comprising the following steps:

[0096] S1. Turn on the near-infrared spectroscopy detection instrument and perform a 7-minute preheating operation;

[0097] S2. Setting parameters of the near infrared spectrum detection instrument, including the measurement range, the number of scans and the scan interval;

[0098] S3, setting the light source parameters, including light source intensity, spectral resolution and integration time parameters;

[0099] S4, prepare test samples, and process them, the processing method is, take transformer oil, add it into a filtration system, filter it, then place it into a deoxidation device, deoxidize it;

[0100] S5, placing the treated sample oil in an oil-gas separation device for treatment, and collecting the gas dissolved in the transformer oil;

[0101] S6. The collected gas is evenly delivered to the sample pool of the near-infrared spectrum detection instrument by using the gas path control unit. Before the gas is delivered, the overall air tightness of the gas path control unit is checked;

[0102] S7, near-infrared spectrum detection instrument detects gas, the specific process is: the light source emits near-infrared light, which is modulated by the modulator and irradiated onto the sample pool containing the gas sample. After the light interacts with the gas molecules, it is received by the light sensor, and after pre-amplification and phase-locked amplification processing, the data acquisition unit records the spectrum data;

[0103] S8. Process and analyze the collected test results through data analysis software to obtain gas type and content data, back up and store the data, set up a gas adsorption test, and calculate the test results. The specific process is as follows:

[0104] A1. Select the appropriate adsorbent based on the type and content of the gas obtained from the test results

[0105] A2. Place the adsorbent in the testing equipment and prepare the test color card;

[0106] A3. Introduce the test gas sample into the test equipment;

[0107] A4. Calculate the type and content of the gas by the color change of the color card;

[0108] A5. If it is inconsistent with the test results, retest;

[0109] S9. Visualize the results using charts.

[0110] In this embodiment, before the oil-gas separation, the method specifically performs a deoxygenation treatment on the oil, which effectively improves the simplicity of subsequent separation of other gases in the oil and improves the subsequent detection effect. When detecting the gas, the light is modulated by the modulator and irradiated onto the sample pool containing the gas sample. After the light interacts with the gas molecules, it is received by the light sensor. After pre-amplification and phase-locked amplification, the data acquisition unit records the spectral data. Through this process, the overall accuracy of the data can be improved, and the data after bidirectional amplification is not easily lost, which can ensure the integrity of the data. At the same time, in this method, there are many different types of visual display processes for the final result data, which can greatly improve the display and dissemination effect of information and data. In addition, the method is also provided with a re-inspection test at the end, which can calculate the final detection result, so as to find errors in the detection result, which helps to improve the accuracy of the final detection result and improve the application effect of the method.

[0111] In addition to Examples 1-4, it should be noted that:

[0112] The experiment of measuring dissolved gas in transformer oil was carried out, and some specific experimental data were obtained, such as Figure 2 :

[0113] During the test, a near-infrared broadband tunable fiber laser is used as the light source, and the wavelength range is usually targeted at the characteristic absorption lines of common dissolved gases in transformer oil.

[0114] For the measurement spectra of acetylene, carbon monoxide, methane and carbon dioxide, appropriate laser output wavelengths can be selected, which are 1531.59nm, 1568.04nm, 1572.34nm and 1527.38nm.

[0115] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A method for directly measuring gas in transformer oil using near infrared spectroscopy, characterized in that: The steps include: S1. Turn on the near-infrared spectrum detection instrument and perform preheating operation; S2. Setting parameters of near infrared spectrum detection instrument; S3, setting the light source parameters; S4. Prepare test samples and process them; S5, placing the treated sample oil in an oil-gas separation device for treatment; S6, sending the collected gas to a sample cell of a near infrared spectrum detection instrument; S7, near infrared spectrum detection instrument detects gas; S8. Process the test results, set up a gas adsorption test, and calculate the test results; S9. Visualize the results.

2. The method for directly measuring gas in transformer oil using near infrared spectroscopy according to claim 1 is characterized in that: In S1, the near infrared spectrum detection instrument is turned on and preheated for 5-10 minutes.

3. The method for directly measuring gas in transformer oil using near infrared spectroscopy according to claim 1 is characterized in that: In S2, the parameters of the near infrared spectrum detection instrument are set, and the set parameters include the measurement range, the number of scans and the scan interval.

4. The method for directly measuring gas in transformer oil using near infrared spectroscopy according to claim 1 is characterized in that: In S3, light source parameters are set, including light source intensity, spectral resolution and integration time parameters.

5. The method for directly measuring gas in transformer oil using near infrared spectroscopy according to claim 1 is characterized in that: In S4, a test sample is prepared and processed. The processing method is to take transformer oil, add it into a filtering system, filter it, and then place it into a deoxidation device to deoxidize it.

6. The method for directly measuring gas in transformer oil using near infrared spectroscopy according to claim 1 is characterized in that: In S5, the treated sample oil is placed in an oil-gas separation device for treatment, and the gas dissolved in the transformer oil is collected.

7. The method for directly measuring gas in transformer oil using near infrared spectroscopy according to claim 1 is characterized in that: In S6, the collected gas is uniformly delivered to the sample pool of the near-infrared spectrum detection instrument by using the gas path control unit. Before the gas is delivered, the overall air tightness of the gas path control unit is checked.

8. The method for directly measuring gas in transformer oil using near infrared spectroscopy according to claim 1 is characterized in that: In S7, the near-infrared spectrum detection instrument detects the gas, and the specific process is: the light source emits near-infrared light, which is modulated by the modulator and irradiated onto the sample pool containing the gas sample. After the light interacts with the gas molecules, it is received by the light sensor. After pre-amplification and phase-locked amplification processing, the data acquisition unit records the spectral data.

9. The method for directly measuring gas in transformer oil using near infrared spectroscopy according to claim 1, characterized in that: In S8, the collected test results are processed and analyzed by data analysis software to obtain gas type and content data, and the data is backed up and stored. A gas adsorption test is set up and the test results are calculated. The specific process is as follows: A1. Select the appropriate adsorbent based on the type and content of the gas obtained from the test results A2. Place the adsorbent in the testing equipment and prepare the test color card; A3. Introduce the test gas sample into the test equipment; A4. Calculate the type and content of the gas by the color change of the color card; A5. If it is inconsistent with the test result, re-test.

10. The method for directly measuring gas in transformer oil using near infrared spectroscopy according to claim 1, characterized in that: In S9, the results are visualized, and the visualization method is one or more of chart display, legend display and graphic display.

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