A portable standard oil sample storage device and on-site verification method

Abstract

The application relates to a portable standard oil sample storage device and a field calibration method, which is used for field calibration of an on-line monitoring device for dissolved gas in transformer oil, reference to standard oil sample preparation concentration requirements and actual demand, determination of target oil sample concentration and standard liquid oil sample concentration to be prepared, laboratory preparation of high-concentration standard liquid oil sample and calibration by using a table chromatograph, storage of the standard liquid oil sample into the application device, transportation to a test site, mixing and preparation of the target oil sample in the application device by using blank oil and the standard liquid oil sample, field calibration of the target oil sample by using a portable chromatograph, and field calibration of the on-line monitoring device for dissolved gas in transformer oil by being connected with the application device.

Description

Technical Field

[0001] This invention relates to the field of online monitoring technology for power equipment, and in particular to the design of a portable standard oil sample storage device and a field verification method. Background Technology

[0002] Online chromatographic monitoring devices can quickly and accurately analyze fault characteristic gases in oil-filled electrical equipment, providing a reliable guarantee for the long-term stable operation of oil-immersed power equipment such as transformers. However, in actual operation, drift and data instability in online oil and gas monitoring devices can lead to false alarms and missed alarms, significantly reducing the effectiveness and accuracy of online monitoring data. Therefore, in accordance with national standards, operation and maintenance units should periodically conduct on-site verification of the accuracy and repeatability of online chromatographic monitoring devices.

[0003] Current on-site calibration techniques for online chromatographic monitoring devices require the pre-preparation of standard oil samples and their transport to the test site. The results of the online chromatographic monitoring device are then compared with the analytical data from laboratory chromatographic instruments to calibrate and evaluate the measurement error and repeatability of the online chromatographic monitoring device.

[0004] Chinese patent publication number CN214174383U discloses a standard oil sample storage device for on-site verification. This device has an oil tank with an air bladder inside. The cavity between the oil tank and the air bladder is used to store the standard oil sample. A high-pressure gas cylinder is connected to the air bladder to maintain a constant pressure on the standard oil sample in the storage tank, preventing gas escape due to external pressure and temperature. Chinese patent application publication number CN112110013A discloses a portable oil storage device. This device's oil sample storage unit is connected to a pressure regulating unit to adjust the pressure within the oil sample storage unit. The detection end of the oil sample state detection unit is located on the oil sample storage unit to detect the storage state of the oil sample. Both patents mention constant-pressure transportation of pre-prepared oil samples for testing. However, neither patent considers the unavoidable evaporation of dissolved gases during long-distance transportation, which could lead to some deviation in the measurement results.

[0005] In summary, although existing technologies have improved the equipment, they still cannot completely prevent the volatilization of standard oil samples during transportation. First, during transportation, the concentrations of various dissolved characteristic gases in the oil change due to bumps, external pressure, and temperature, reducing the accuracy of on-site calibration of online chromatographic monitoring devices. Second, the harsh environmental conditions at calibration sites make it impossible to prepare standard oil samples on-site using laboratory methods. Finally, the standard oil sample preparation process is cumbersome, the oil sample storage time is short, and there is a lack of flexibility to adjust the target oil sample concentration according to on-site conditions. Summary of the Invention

[0006] To address the problems in the background technical documents, such as the susceptibility of oil sample transportation to external influences and the cumbersome preparation of oil samples, this invention proposes an improved solution.

[0007] On one hand, the present invention provides a portable standard oil sample storage device, including an oil storage unit, which is connected to a gas storage unit and a circulation unit, and the oil storage unit and the gas storage unit are connected by a pipeline; a gas pressure controller and a pressure gauge are sequentially connected to the pipeline between the gas storage unit and the oil storage unit; the oil storage unit includes an oil storage tank, a piston is installed inside the oil storage tank, a blank oil inlet valve and an oil outlet valve are installed at the bottom of the oil storage tank, and a second exhaust valve is installed at the top of the oil storage tank; the circulation unit includes an oil inlet pipe connected to the oil storage tank, one end of the oil inlet pipe is located at the bottom of the oil storage tank, and the other end is located outside the oil storage tank; an oil outlet pipe is installed at the bottom of the oil storage tank, and a circulation valve and an oil pump are installed between the oil inlet pipe and the oil outlet pipe; an oil inlet solenoid valve is installed at the end of the oil outlet pipe away from the bottom, and an oil outlet solenoid valve is installed at the end of the oil outlet pipe away from the oil storage tank;

[0008] Preferably, the gas storage unit includes a gas storage cylinder and a pressure regulating valve connected to the outlet of the gas storage cylinder, and a first exhaust valve is provided at the upper end of the gas storage cylinder;

[0009] The circulation valve includes a first circulation valve and a second circulation valve, which are located at both ends of the oil pump, respectively.

[0010] The gas storage unit, oil storage unit, and circulation unit are all located inside the outer casing, and the bottom of the outer casing is equipped with casters.

[0011] On the other hand, the present invention provides a method for on-site verification of a portable standard oil sample storage device, comprising the following steps:

[0012] S1. Determine the target oil sample concentration based on the on-site calibration standards, calculate the concentration of the standard solution oil sample and the volume of the standard mixed gas in the laboratory, and prepare the standard solution oil sample;

[0013] S2. Inject standard liquid oil samples into a portable standard oil sample storage device in the laboratory;

[0014] S3. Inject blank oil into another portable standard oil sample storage device in the laboratory;

[0015] S4. Transport the portable standard oil sample storage device containing the standard liquid oil sample and the portable standard oil sample storage device containing the blank oil sample to the experimental site;

[0016] S5. At the experimental site, a standard liquid oil sample is extracted and injected into a portable storage device containing blank oil for mixing to obtain a target oil sample. The target oil sample is then extracted for calibration to obtain the target oil sample calibrated concentration, and then on-site verification is performed.

[0017] Preferably, the required standard solution oil sample concentration is calculated based on the target oil sample concentration preparation formula, specifically using the following formula:

[0018] Standard solution oil sample concentration:

[0019] c 标准液 =100×c 目标油样max

[0020] c 标准液 —Standard solution oil sample concentration, in μL / L;

[0021] c 目标油样max —Maximum concentration of the target oil sample, in μL / L;

[0022] Calculate the volume of the standard mixed gas based on the concentration of the standard liquid oil sample:

[0023]

[0024] c 标准液 —Standard solution oil sample concentration, in μL / L;

[0025] V 空白油 —The volume of blank oil used for preparation is in liters (L), typically 10L.

[0026] c 标准混合气体 —Standard mixed gas concentration, in μL / L;

[0027] V 标准混合气体 —The volume of standard mixed gas added during preparation, in liters (L);

[0028] δ—The dissolution ratio of the standard mixed gas in the oil mixing machine, provided by the instrument manufacturer.

[0029] Preferably, the standard mixed gas in S1 is H2, CO, CO2, CH4, C2H6, C2H2 and total hydrocarbons, and the configuration is to shake for 20 minutes and let stand for 1 hour;

[0030] Preferably, the specific operation of injecting the standard liquid oil sample in S2 is as follows: close the pressure stabilizing valve and the first exhaust valve, then open the second exhaust valve, so that the pressure in the oil storage tank is equal to the atmospheric pressure; open the blank oil inlet valve, the inlet solenoid valve, the first circulation valve, the second circulation valve, the oil sampling solenoid valve, and the oil discharge valve, and the piston moves downward to the bottom of the oil storage tank; close the inlet solenoid valve, the first circulation valve, the second circulation valve, the oil sampling solenoid valve, and the oil discharge valve, and the standard liquid in the transformer oil dissolved gas standard oil sample preparation device is injected into the oil storage tank along the inlet pipeline, and then close the blank oil inlet valve and the second exhaust valve;

[0031] Preferably, the volume of the blank oil in S3 is generally 10L, and the step of injecting the blank oil is the same as the operation of injecting the standard solution in S2.

[0032] Preferably, the volume of the standard liquid oil sample extracted in S5 is calculated using the following formula:

[0033]

[0034] V 标准液 —The volume of standard solution required to prepare an oil sample of the target concentration, in liters (L);

[0035] c 标准液 —Standard solution oil sample concentration, in μL / L;

[0036] c 目标油样 —Target oil sample concentration, in μL / L;

[0037] V 空白油 —Add blank oil volume to prepare the target concentration oil sample, in L, usually 10L;

[0038] Preferably, the mixing method described in S5 is as follows: the second exhaust valve is opened, and the pressure inside the oil storage tank is equal to the atmospheric pressure; the standard liquid sample syringe is connected to the oil inlet, the oil inlet solenoid valve is opened, and the standard liquid sample V is drawn. 标准液 The standard solution oil sample enters the storage tank along the oil mixing pipeline, and then the oil inlet solenoid valve is closed; the first circulation valve, oil pump and second circulation valve are opened, and the standard oil sample drawn by the oil pump is circulated and mixed with the storage tank through the circulation pipeline, and then the first circulation valve, oil pump and second circulation valve are closed; preferably, the mixing time in S5 is 1 hour and the settling time is 1 hour; the method for calibrating the concentration of the target oil sample is to draw 50 mL of the target oil sample and send it to the laboratory for testing or use a portable chromatograph for testing, and complete the testing within 4 days; when the target oil sample is taken, the pipeline connection and valves should be fully sealed, the air remaining in the sampling joint must be completely removed, no air bubbles should be generated in the oil during operation, and the syringe core should be able to move freely after sampling to avoid the formation of a negative pressure cavity. The target oil sample should be stored away from light and avoid violent vibration during transportation;

[0039] In this invention, blank oil refers to unused new transformer oil; target oil sample concentration refers to the estimated oil sample concentration set as needed before the preparation of standard oil sample, which can be used to calculate the volume of the required initial concentration oil sample; target oil sample calibration concentration refers to the standard oil sample concentration obtained by laboratory or portable chromatograph after the preparation of standard oil sample, which can be used for subsequent online chromatographic on-site verification calculation.

[0040] The beneficial effects of this invention are:

[0041] (1) This invention proposes a portable standard oil sample storage device and on-site verification method. The method prepares a target oil sample by uniformly mixing a high-concentration standard solution with blank oil at the test site, thereby realizing the on-site preparation of standard oil samples. This effectively reduces the error caused by the change in the concentration of dissolved gas in the oil during transportation. At the same time, the concentration of the target oil sample can be adjusted according to the on-site conditions to improve the accuracy and flexibility of standard oil sample preparation.

[0042] (2) Target oil samples are prepared using blank oil at the test site, and the concentration of the target oil samples is directly calibrated using a portable chromatograph. On-site testing only requires carrying the device invented in this patent and the portable chromatograph, reducing the cost of transporting large quantities of standard oil samples and saving manpower and resources. This device improves the efficiency of on-site calibration testing of online chromatographic monitoring devices, enabling the configuration of standard oil samples in multiple scenarios, such as laboratories or work sites (where environmental conditions are inferior to laboratory environments), thus reducing the risk of environmental pollution from standard oil samples.

[0043] (3) The device of the present invention uses inert gas to pressurize the oil storage device, which is convenient and safe to operate;

[0044] (4) The device of the present invention cleverly utilizes the weight of the piston and the air pressure to quickly exhaust the gas in the oil storage device, and can also use the weight of the piston itself and the pressure generated by the inert gas to maintain the pressure of the oil storage device during transportation. Attached Figure Description

[0045] Figure 1 This is a schematic diagram of a portable standard oil sample storage device.

[0046] 1. Outer shell; 2. Gas tank; 3. Pressure regulating valve; 4. First exhaust valve; 5. Gas pressure controller; 6. Pressure gauge; 7. Second exhaust valve; 8. Piston; 9. Oil tank; 10. Oil inlet solenoid valve; 11. First circulation valve; 12. Oil pump; 13. Second circulation valve; 14. Oil extraction solenoid valve; 15. Blank oil inlet valve; 16. Oil discharge valve; 17. Casters.

[0047] Figure 2 This is a flowchart of a portable method for on-site preparation and storage of standard oil samples. Detailed Implementation

[0048] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0049] Example 1

[0050] This embodiment provides a portable standard oil sample storage device, specifically including an oil storage unit, which is connected to a gas storage unit and a circulation unit. The oil storage unit and the gas storage unit are connected by a pipeline. A gas pressure controller 5 and a pressure gauge 6 are sequentially connected to the pipeline between the gas storage unit and the oil storage unit. The oil storage unit includes an oil tank 9, with a piston 8 installed inside the oil tank 9. A blank oil inlet valve 15 and an oil outlet valve 16 are installed at the bottom of the oil tank 9, and a second exhaust valve 7 is installed at the top of the oil tank 9. The circulation unit includes an oil inlet pipe connected to the oil tank 9. One end of the oil inlet pipe is located at the bottom of the oil tank 9, and the other end is located outside the oil tank 9. An oil outlet pipe is installed at the bottom of the oil tank 9. A circulation valve and an oil pump 12 are installed between the oil inlet pipe and the oil outlet pipe. An oil inlet solenoid valve 10 is installed at the end of the oil outlet pipe away from the bottom, and an oil outlet solenoid valve 14 is installed at the end of the oil outlet pipe away from the oil tank 9.

[0051] The gas storage unit includes a gas storage cylinder 2 and a pressure regulating valve 3 connected to the outlet of the gas storage cylinder 2. A first exhaust valve 4 is provided at the upper end of the gas storage cylinder 2.

[0052] The circulation valve includes a first circulation valve 11 and a second circulation valve 13, which are located at both ends of the oil pump 12, respectively.

[0053] The gas storage unit, oil storage unit and circulation unit are all located inside the outer casing 1, and the bottom of the outer casing 1 is equipped with casters 17.

[0054] Example 2

[0055] This embodiment, based on the portable standard oil sample storage device provided in Embodiment 1, provides an on-site calibration method. The specific operation steps are as follows.

[0056] Step 1: Inject blank oil

[0057] Prepare three portable standard oil sample storage devices as provided in Example 1 in advance, inject blank oil (referring to unused new transformer oil), and process them by high-purity nitrogen bubbling, stirring, and vacuuming. The specific operation is as follows:

[0058] Close the pressure regulating valve 3 and the first exhaust valve 4, then open the second exhaust valve 7 to make the pressure inside the oil storage tank 9 equal to the atmospheric pressure; open the blank oil inlet valve 15, the oil inlet solenoid valve 10, the first circulation valve 11, the second circulation valve 13, the oil take-up solenoid valve 14, and the oil drain valve 16, and the piston moves downward by gravity until the piston reaches the bottom of the oil storage tank 9; close the oil inlet solenoid valve 10, the first circulation valve 11, the second circulation valve 13, the oil take-up solenoid valve 14, and the oil drain valve 16. When the amount of blank oil injected into the oil storage tank 9 along the oil inlet pipeline is 10L, close the blank oil inlet valve 15 and the second exhaust valve 7.

[0059] Step 2: Prepare standard solution

[0060] The target oil sample concentration is determined based on the on-site calibration standards. The concentration of the standard solution oil sample and the volume of the standard mixed gas are calculated, and the standard solution oil sample is prepared. The specific operation is as follows:

[0061] S1. Determine the target oil sample concentration and the standard solution oil sample concentration to be prepared.

[0062] According to Q / GDW10536-2021 "Technical Specification for Online Monitoring Device of Dissolved Gases in Transformer Oil", the concentrations of each dissolved characteristic gas in the target oil sample required for on-site calibration of the online chromatographic monitoring device were determined. All concentrations of each dissolved characteristic gas were less than the limits for each dissolved characteristic gas in blank oil specified in Q / GDW11304.41-2015 "Technical Specification for Live-Line Testing Instruments for Power Equipment Part 4-1: Technical Specification for Live-Line Testing Instruments for Dissolved Gas Analysis in Oil (Gas Chromatography)". Based on the target oil sample concentration and the standard solution preparation formula, the required standard solution oil sample concentration was calculated. The standard solution oil sample volume was fixed at 10L. The target oil sample concentrations are shown in Table 1.

[0063] Table 1

[0064]

[0065] The specific formula for the concentration of the standard solution oil sample is as follows:

[0066] c 标准液 =100×c 目标油样max

[0067] c 标准液 —Standard solution oil sample concentration, μL / L;

[0068] c 目标油样max —Maximum concentration of the target oil sample, μL / L;

[0069] The target concentration of the laboratory-prepared standard solution is calculated based on the standard solution oil sample concentration formula, as shown in Table 2.

[0070] Table 2

[0071]

[0072] Calculate the volume of the standard mixed gas based on the concentration of the standard liquid oil sample:

[0073]

[0074] c 标准液 —Standard solution concentration, μL / L;

[0075] V 空白油 —The volume of blank oil used for preparation is in liters (L). Take 10L.

[0076] c标准混合气体 —Standard mixed gas concentration, μL / L;

[0077] V 标准混合气体 —The volume of the standard mixed gas added during preparation, in L;

[0078] δ—The dissolution ratio of the standard mixed gas in the oil mixing machine, provided by the instrument manufacturer.

[0079] S2. Preparation of standard solution oil sample

[0080] Inject blank oil into the transformer oil dissolved gas standard oil sample preparation device, accurately extract the standard mixed gas and mix it with the blank oil using a 10mL syringe, shake at room temperature for 20 minutes, and let stand for 1 hour.

[0081] S3. Transfer the standard solution sample to the standard oil sample preparation and storage device.

[0082] Close the pressure regulating valve 3 and the first exhaust valve 4, then open the second exhaust valve 7, and the pressure inside the oil storage tank 9 becomes equal to the atmospheric pressure; open the blank oil inlet valve 15, the oil inlet solenoid valve 10, the first circulation valve 11, the second circulation valve 13, the oil extraction solenoid valve 14, and the oil discharge valve 16, and the piston moves downwards by gravity until it reaches the bottom of the oil storage tank 9; close the oil inlet solenoid valve 10, the first circulation valve 11, the second circulation valve 13, the oil extraction solenoid valve 14, and the oil discharge valve 16, and the standard liquid in the transformer oil dissolved gas standard oil sample preparation device is injected into the oil storage tank 9 along the oil inlet pipeline, then close the blank oil inlet valve 15 and the second exhaust valve 7, and label the outside of the device "standard liquid".

[0083] S4. Laboratory chromatograph calibration

[0084] Open the oil extraction solenoid valve 14, use a 100mL syringe to draw 50mL of standard solution oil sample, use a laboratory chromatograph to detect and calibrate it, and then close the oil extraction solenoid valve 14.

[0085] Step 3: Transport to the experimental site

[0086] Open the pressure regulating valve 3 and the gas pressure controller 5. The inert gas in the gas storage cylinder 2 is delivered to the piston 8 through the gas pipeline, so that the upper part of the oil storage tank 9 and all valves are in a completely sealed state. Then close the pressure regulating valve 3 and the gas pressure controller 5, and transport the oil storage tank to the test site. During transportation, avoid violent shaking.

[0087] Step 4: Oil preparation at the experimental site

[0088] S1. At the experimental site, open the second exhaust valve 7, and the pressure inside the oil storage tank 9 is equal to the atmospheric pressure; connect the standard liquid sample syringe to the oil inlet, open the oil inlet solenoid valve 10, and use a 100mL syringe to draw standard liquid sample V. 标准液The standard liquid sample enters the oil storage tank 9 along the oil distribution pipeline, and then the oil inlet solenoid valve 10 is closed.

[0089] The volume of the standard liquid oil sample extracted is calculated using the following formula:

[0090]

[0091] V 标准液 —The volume of standard solution required to prepare an oil sample of the target concentration, in L;

[0092] c 标准液 —Standard solution oil sample concentration, μL / L;

[0093] c 目标油样 —Target oil sample concentration, μL / L;

[0094] V 空白油 — To prepare the target concentration oil sample, add 10L of blank oil.

[0095] The required standard solution oil sample volumes for preparing the target oil sample concentration are shown in Table 3.

[0096] Table 3

[0097] Standard solution oil sample volume (mL) low concentration 10.00 medium concentration 50.00 high concentration 100.00

[0098] S2. Open the first circulation valve 11, oil pump 12 and the second circulation valve 13. The standard oil sample drawn by the oil pump 12 is repeatedly circulated and mixed with the oil storage tank 9 through the circulation pipeline. After circulating for 1 hour, the gas and liquid phases reach equilibrium to form the target concentration standard oil sample. Close the first circulation valve 11, oil pump 12 and the second circulation valve 13. Let the target concentration standard oil sample stand for 1 hour. The target concentration standard oil sample is stable.

[0099] S3. Open the oil sampling solenoid valve 14, use a 100mL syringe to draw 50mL of the target concentration standard oil sample, inject 10mL of inert carrier gas, select a closed, dry test background, use a portable chromatograph to detect the sample, determine the calibration concentration of the target concentration standard oil sample, and close the oil sampling solenoid valve 14. When sampling the target concentration standard oil sample, the pipeline connections and valves should be fully sealed; any residual air in the sampling connector must be completely removed, and no air bubbles should be generated in the oil during operation; after sampling, the syringe core should be able to move freely to avoid forming a negative pressure cavity; the oil sample should be stored away from light and avoid violent vibration during transportation; the oil sample should be analyzed and tested within 4 days after extraction.

[0100] Step 5: On-site verification

[0101] Open the pressure regulating valve 3 and the gas pressure controller 5. The inert gas in the gas storage cylinder 2 is delivered to the piston 8 through the gas pipeline, and the oil storage device is in a pressurized state. Open the oil inlet solenoid valve 10 and the oil outlet solenoid valve 14. Connect the oil inlet of the online chromatographic monitoring device to the oil outlet of the standard oil sample preparation and storage device, and connect the oil outlet of the online monitoring device to the oil inlet of the standard oil sample preparation and storage device to begin the verification.

[0102] Detection and Analysis

[0103] The results of on-site calibration of the actual target oil sample concentration using a portable chromatograph are shown in Table 4, and the results of preparing the target oil sample concentration using traditional methods are shown in Table 5.

[0104] Table 4

[0105]

[0106] Table 5

[0107]

[0108] The measurement errors of the target concentration oil sample prepared by the method of this patent invention and the traditional method are compared. The results are shown in Table 6 (measurement error of the target concentration oil sample prepared by the method of this patent invention) and Table 7 (measurement error of the target concentration oil sample prepared by the traditional method).

[0109] Table 6

[0110]

[0111] Table 7

[0112]

[0113] Comparing Tables 4 and 5, it can be seen that the concentration of the target oil sample prepared using the device provided by the present invention is higher than that prepared by the traditional method, which indicates that the device of the present invention can reduce gas volatilization in the transportation process; comparing Tables 6 and 7, the measurement error of the target concentration oil sample prepared by the method of the present invention is lower than that prepared by the traditional method, which confirms that the method of the present invention can reduce the concentration preparation error.

[0114] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A portable standard oil sample storage device, characterized by, The application relates to a portable standard oil sample storage device, which comprises a storage unit, a gas storage unit and a circulating unit; a gas pressure controller (5) and a pressure gauge (6) are sequentially connected on a pipeline between the gas storage unit and the storage unit; the storage unit comprises a storage tank (9), the inside of the storage tank (9) is provided with a piston (8), the bottom of the storage tank (9) is provided with a blank oil inlet valve (15) and an oil discharge valve (16), and the upper end of the storage tank (9) is provided with a second exhaust valve (7); the circulating unit comprises an oil inlet pipe which is communicated with the storage tank (9), one end of the oil inlet pipe is located at the bottom of the storage tank (9), the other end of the oil inlet pipe is located outside the storage tank (9), the bottom of the storage tank (9) is provided with an oil taking pipe, a circulating valve and an oil pump (12) are arranged between the oil inlet pipe and the oil taking pipe, an oil inlet electromagnetic valve (10) is arranged at the end of the oil taking pipe which is far away from the bottom, and an oil taking electromagnetic valve (14) is arranged at the end of the oil taking pipe which is far away from the storage tank (9); The gas storage unit comprises a gas storage cylinder (2) and a pressure stabilizing valve (3) which is connected with the outlet of the gas storage cylinder (2), and the upper end of the gas storage cylinder (2) is provided with a first exhaust valve (4); The circulating valve comprises a first circulating valve (11) and a second circulating valve (13), and the first circulating valve (11) and the second circulating valve (13) are respectively located at the two ends of the oil pump (12); The gas storage unit, the storage unit and the circulating unit are arranged in the inside of a shell (1), and the bottom of the shell (1) is provided with universal wheels (17).

2. A method of field verification of a portable standard oil sample storage device, characterized in that, The application further discloses a standard oil sample preparation method, which comprises the following steps: S1. determining a target oil sample concentration according to a field calibration standard, calculating a standard liquid oil sample concentration and a standard mixed gas volume, and preparing the standard liquid oil sample; S2. injecting the standard liquid oil sample into the portable standard oil sample storage device; S3. injecting blank oil into another portable standard oil sample storage device; S4. transporting the portable standard oil sample storage device injected with the standard liquid oil sample and the portable standard oil sample storage device injected with the blank oil to an experimental site; S5. extracting the standard liquid oil sample, injecting the standard liquid oil sample into the portable standard oil sample storage device containing the blank oil to obtain a target oil sample, extracting the target oil sample to obtain a target oil sample calibration concentration, and then performing field calibration.

3. The method of claim 2, wherein the portable standard oil sample storage device is a portable standard oil sample storage device as claimed in any one of claims 1 to 2. The required standard liquid oil sample concentration is calculated according to a target oil sample concentration preparation calculation formula, and the formula is as follows: The standard liquid oil sample concentration is calculated according to a target oil sample concentration preparation calculation formula, and the formula is as follows: c 标准液 - standard liquid oil sample concentration in μL / L; c 目标油样max - target oil sample concentration maximum value in μL / L; The standard mixed gas volume is calculated according to the standard liquid oil sample concentration, and the formula is as follows: c 标准液 - standard liquid oil sample concentration in μL / L; V 空白油 - Volume of blank oil at formulation, in L; c 标准混合气体 - Standard gas mixture concentration in μL / L; V 标准混合气体 - Standard gas volume added at formulation, in L; The standard mixed gas is H2, CO, CO2, CH4, C2H6, C2H2 and total hydrocarbon, and the preparation is oscillation for 20 min and standing for 1 h.

4. The method of claim 2, wherein the portable standard oil sample storage device field verification method is characterized by, ​ 5. The method of claim 2, wherein the portable standard oil sample storage device field verification method is characterized by, The specific operation of injecting the standard liquid oil sample in S2 is as follows: the pressure stabilizing valve (3) and the first exhaust valve (4) are closed, then the second exhaust valve (7) is opened, the pressure in the oil storage tank (9) is equal to the atmospheric pressure; the blank oil inlet valve (15), the oil inlet solenoid valve (10), the first circulating valve (11), the second circulating valve (13), the oil taking solenoid valve (14) and the oil discharge valve (16) are opened, the piston moves downward to the bottom of the oil storage tank (9); the oil inlet solenoid valve (10), the first circulating valve (11), the second circulating valve (13), the oil taking solenoid valve (14) and the oil discharge valve (16) are closed, the standard liquid in the transformer oil dissolved gas standard oil sample preparation device is injected into the oil storage tank (9) along the oil inlet pipeline, then the blank oil inlet valve (15) and the second exhaust valve (7) are closed.

6. The method of claim 2, wherein, The step of injecting the blank oil in S3 is the same as the operation of injecting the standard liquid oil sample in S2.

7. The method of claim 2, wherein the portable standard oil sample storage device field verification method is characterized by, The volume of the standard liquid oil sample drawn in S5 is calculated by the following formula: V 标准液 - the volume of the standard liquid oil sample required to prepare the target concentration oil sample, in L; c 标准液 - standard liquid oil sample concentration in μL / L; c 目标油样 - target oil sample concentration in μL / L; V 空白油 - Volume of blank oil to which the oil sample at the target concentration is formulated, in L.

8. The method of claim 2, wherein the portable standard oil sample storage device field verification method is characterized by, The mixing method in S5 is: opening the second exhaust valve (7), the pressure in the oil tank (9) is equal to the atmospheric pressure; a standard liquid oil sample injector is connected to the oil inlet, the oil inlet solenoid valve (10) is opened, and the standard liquid oil sample V 标准液 is extracted; the standard liquid oil sample enters the oil tank (9) along the oil distribution pipeline, and then the oil inlet solenoid valve (10) is closed; the first circulating valve (11), the oil pump (12) and the second circulating valve (13) are opened, the standard oil sample extracted by the oil pump (12) is mixed with the oil tank (9) through the circulating pipeline, and then the first circulating valve (11), the oil pump (12) and the second circulating valve (13) are closed.

9. The method of claim 2, wherein the portable standard oil sample storage device field verification method is characterized by, The mixing time in S5 is 1 h, the static time is 1 h; the calibration method of the target oil sample concentration is to draw 50 mL of the target oil sample and complete the determination.

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