A standard apparatus and method for preparing transformer oil with trace moisture content

Abstract

This invention proposes a standard trace moisture transformer oil preparation device and method for use in the field of transformer oil testing in power systems. It is the first to propose a method that, by metering and adding a very small percentage of methanol as a co-solvent in the transformer oil as an intermediate transitional dissolution medium, a standard trace moisture transformer oil sample containing the vast majority of the components can be prepared. Simultaneously, a small-package filling device for preparing the standard trace moisture transformer oil was designed, solving the problem of deviations in traditional testing methods that use pure water as a standard sample to detect trace moisture content in transformer oil. This invention provides an accurate, convenient, economical, and efficient calibration standard oil sample for offline and online testing of trace moisture content in transformer oil, providing strong testing and supervision guarantees for ensuring the safe operation of high-voltage oil-filled power equipment.

Description

Technical Field

[0001] This invention relates to the field of transformer oil testing technology in power systems, and in particular to a standard trace moisture transformer oil preparation device and preparation method. Background Technology

[0002] The detection of trace moisture in transformer oil in power systems is a crucial testing method for monitoring a vast number of high-voltage oil-filled power equipment, playing a vital role in ensuring the safe operation of the power grid. Because the moisture content in transformer oil is measured in micrograms (µg / g), it places high demands on the testing instruments, the skill level of the operators, and the purity of the reagents. A known standard substance is needed to calibrate the accuracy, repeatability, and reliability of the testing instruments, as well as to verify the operator's skill level and the purity of the reagents. However, current methods primarily involve directly using a precision-calibrated micro-water syringe to extract a trace amount of pure water and inject it directly into the trace moisture analyzer as a calibration sample for transformer oil moisture content detection. This method of directly injecting pure water to calibrate the trace moisture content of transformer oil cannot accurately reflect the ratio of trace moisture content in the transformer oil due to the difference between the water and oil phases. If a standard oil sample containing a known trace moisture component could be developed to replace the currently used water sample as a standard, it would greatly reduce detection errors and provide a good benchmark for verifying the accuracy of the testing instruments, the operator's skill level, and the purity of the reagents. Summary of the Invention

[0003] This invention proposes a standard trace moisture transformer oil preparation device and preparation method, which can provide an accurate, convenient, economical and efficient calibration standard oil sample for offline and online detection of trace moisture content in transformer oil, and provide strong detection and supervision guarantee for ensuring the safe operation of high-voltage oil-filled power equipment.

[0004] The present invention adopts the following technical solution.

[0005] A method for preparing standard transformer oil with trace moisture content includes the following steps;

[0006] Step S1: First, a small proportion of methanol or alcohol solvent is added to high-purity transformer oil as a co-solvent to form a formulation oil. The main component of the formulation oil is transformer oil. The co-solvent makes trace amounts of water more easily soluble in the transformer oil.

[0007] Step S2: Add a trace amount of water to the quantitatively prepared oil, seal and stir evenly to form standard trace water transformer oil;

[0008] Step S3: Measure and add pure water to the corresponding precisely weighed oil according to the different proportions of pure water components in the oil to prepare a series of standard trace moisture transformer oils with different contents of trace water components.

[0009] Step S4: The series of standard trace moisture transformer oils from step S3 are sealed and metered into small plastic tubes for single use, and then heat-sealed into small packages as standard samples of trace moisture transformer oils for single use.

[0010] The alcohol solvent is high-purity methanol;

[0011] In step S3, the filling process uses a hot melt clamp, a precision graduated micro-water syringe with a long needle, and a sealed filling and weighing device;

[0012] The small package plastic tube is a tube with closed top and bottom openings, formed by molding high-quality transparent organic plastic. The lower part of the tube is connected to a first slender plastic tube with marked graduations, and the upper part of the tube is connected to a second slender plastic tube with marked graduations. Both the first and second slender plastic tubes are connected to the inner cavity of the tube. The first slender plastic tube can be inserted into the filling stainless steel tube of the sealing filling and weighing device and kept tightly sealed.

[0013] In step S3, the sealing and filling weighing device fills the prepared standard micro-water content transformer oil into the inner cavity of the tube through the first slender plastic tube while maintaining a sealed state. After filling, the marked scale part of the first slender plastic tube that is not inserted into the filling hard tube is sealed by heat fusion clamp.

[0014] The second slender plastic tube is used for venting and oil overflow after standard trace moisture transformer oil is filled into the inner cavity of the plastic tube.

[0015] After the tubular tube is filled with oil, the second slender plastic tube is sealed with a heat-melting clamp at the marked scale. The marked scale of the slender plastic tube serves to uniformly measure the standard micro-water content of transformer oil in the inner cavity of the plastic tube.

[0016] In step S3, a precision-calibrated micro-water syringe is used to meter and inject high-purity water into the prepared oil.

[0017] In step S3, pure water is measured and added to the corresponding precisely weighed oil according to the pure water components of 10ug / g, 20ug / g, 30ug / g, and 40ug / g, respectively, to prepare a series of standard trace moisture transformer oils with trace water components of 10ug / g, 20ug / g, 30ug / g, and 40ug / g; these are supplied to power system transformer oil laboratories or substations for preventive testing.

[0018] A standard trace moisture transformer oil preparation device is used in the above-described standard trace moisture transformer oil preparation method. The sealed filling and weighing device includes: a precision weight sensor, a piston filler, a miniature bidirectional drive motor, a first miniature solenoid valve, a second miniature solenoid valve, a third miniature solenoid valve, a miniature ultrasonic generator, a miniature ultrasonic matching arc mirror probe, and a hot melt clamp.

[0019] The piston filler includes a piston column and piston cylinder structure made of high-quality stainless steel. The piston filler is placed on top of a precision weight sensor. A first micro solenoid valve is installed at the center of the top of the piston cylinder of the filler. The first micro solenoid valve is connected to a micro tee.

[0020] The straight end of the miniature tee is connected to a second miniature solenoid valve, the side end of the miniature tee is connected to a third miniature solenoid valve, and the other end of the second miniature solenoid valve is connected to a stainless steel filling hard tube.

[0021] Stainless steel filling hard tubes are used to fit into the first slender plastic tube with graduations in a small packaged plastic tube body.

[0022] The other end of the third miniature solenoid valve is connected to a connector for injecting high-purity transformer oil.

[0023] The piston cylinder of the filling device is inlaid with several miniature matching arc-shaped ultrasonic probes. The matching arc-shaped ultrasonic probes are integrated with the arc wall of the piston cylinder to avoid affecting the piston's pulling and pulling movement inside the piston cylinder and to ensure a seal.

[0024] Each matching curvature mirror ultrasonic probe is electrically connected in parallel to a miniature ultrasonic generator. The ultrasonic waves emitted by the miniature ultrasonic generator are transmitted into the piston cylinder through the matching curvature mirror ultrasonic probes, which oscillate and stir the standard trace amount of water transformer oil in the piston cylinder to make it uniform.

[0025] A miniature bidirectional drive motor is mounted on the outside of the piston cylinder. The miniature bidirectional drive motor drives the piston rod of the piston filler to reciprocate through a drive rod connected to the piston rod.

[0026] The method for preparing and filling 5 kg of standard trace moisture transformer oil with a trace moisture content of 10 ug / g under a constant temperature and humidity environment includes the following steps:

[0027] Step A1: Add 50g of high-purity methanol as a co-solvent to 4950g of high-purity transformer oil at a weight ratio of 1% of the transformer oil, and dissolve it evenly to form 5kg of prepared oil.

[0028] Step A2: Input the parameters required to prepare 5 kg of standard trace moisture transformer oil with a trace moisture content of 10 ug / g into the control module of the sealed filling and weighing device;

[0029] Step A3: Connect the connector pipe of the third micro solenoid valve (7). The other end of the connector pipe is used to enter the oil for preparation.

[0030] Step A4: Sequentially open the third micro solenoid valve and the first micro solenoid valve (5) of the sealed filling and weighing device.

[0031] Step A5: Turn on the micro bidirectional drive motor (9), and pull the piston rod (2) through the drive rod (10) to put a small amount of the prepared oil into the piston cylinder (3) through the third micro solenoid valve and the first micro solenoid valve for cleaning;

[0032] Step A6: When the miniature bidirectional drive motor pulls the piston rod to the set length via the drive rod, the third miniature solenoid valve is closed.

[0033] Step A7: Open the second micro solenoid valve (6), reverse the direction of the bidirectional micro drive motor, and slowly discharge the air and cleaning oil in the piston cylinder through the second micro solenoid valve until the drive piston column is pushed to the top of the piston cylinder to complete the cleaning process.

[0034] Step A8: Close the miniature bidirectional drive motor and the second miniature solenoid valve;

[0035] Step A9: Turn on the precision weight sensor (1);

[0036] Step A10: Open the third miniature solenoid valve;

[0037] Step A11: Turn on the micro bidirectional drive motor, pull the piston through the drive rod, and slowly draw the prepared oil into the piston cylinder through the third micro solenoid valve and the first micro solenoid valve.

[0038] Step A12: When the set weight value of 5kg is reached, close the third micro solenoid valve and the micro bidirectional drive motor;

[0039] Step A13: Turn off the precision weight sensor and disconnect the oil connection pipe on the third miniature solenoid valve;

[0040] Step A14: Open the second miniature solenoid valve;

[0041] Step A20: Pass the long needle of the precision graduated micro water injector (11) through the second micro solenoid valve and the first micro solenoid valve;

[0042] Step A21: Push the precision graduated micro water injector to slowly inject pure water into the piston cylinder and mix it with the high-purity transformer oil in the piston cylinder;

[0043] Step A22: When the precision-calibrated micro-water syringe reaches the scale value of 0.05ml, remove the precision-calibrated micro-water syringe, close the first micro solenoid valve and the second micro solenoid valve. Assuming that 0.05ml of pure water is negligible compared to the volume of 5kg of prepared oil, take the density of pure water at 4°C as 1g / ml, or calculate the water density based on the preparation temperature, and calculate that the standard trace moisture transformer oil prepared at this time contains 10ug / g of trace water.

[0044] Step A23: Turn on the miniature ultrasonic generator (16), and emit ultrasonic waves through several matching arc-shaped mirror ultrasonic probes (4) embedded in the inner wall of the piston cylinder. These ultrasonic waves are emitted into the piston cylinder, which can oscillate and stir the transformer oil in the piston cylinder to accelerate the mixing and dissolution of pure water and the prepared oil.

[0045] Step A24: After the set time is reached, turn off the ultrasonic generator. After the sealed filling weighing device has stood still for the set time, you can start the small-package sealing and filling of the standard trace moisture transformer oil sample with a trace moisture content of 10ug / g.

[0046] After changing the component ratio, the above steps can be used to prepare a series of standard trace moisture transformer oils with trace moisture contents of 20ug / g, 30ug / g, and 40ug / g.

[0047] The process of filling disposable small plastic tubes with standard trace moisture transformer oil with a trace moisture content of 10ug / g and then heat-sealing them includes the following steps:

[0048] Step B1: Install the stainless steel filling hard tube (8) onto the piston cylinder second miniature solenoid valve connector;

[0049] Step B2: Insert the first slender plastic tube (13) at the bottom of the disposable small package plastic tube (14) into the filling stainless steel filling hard tube in the center of the piston cylinder, and keep it tightly sealed.

[0050] Step B3: Turn on the miniature bidirectional drive motor and push the piston rod through the drive rod;

[0051] Step B4: Open the first micro solenoid valve and the second micro solenoid valve. The standard trace amount of water transformer oil (12) in the piston cylinder begins to be slowly injected into the plastic tube body through the first micro solenoid valve, the second micro solenoid valve, and the first slender plastic tube of the plastic tube body, and the air is discharged through the second slender plastic tube (15) of the plastic tube body.

[0052] Step B5: When the second slender plastic tube of the plastic tube body has exhausted the air and oil begins to overflow, close the second micro solenoid valve, the first micro solenoid valve, and the micro bidirectional drive motor in sequence.

[0053] Step B6: Use heat fusion clamps to heat fuss and seal the graduations of the first and second slender plastic tubes respectively;

[0054] Step B7: Remove the small packaged plastic tube from the stainless steel filling hard tube, as well as the excess thin plastic tube portion;

[0055] Step B8: Continue with the process of filling the next small package of disposable plastic tubes with standard trace moisture transformer oil;

[0056] After changing the component ratio, the above steps can be used for the sealing and filling of a series of standard trace moisture transformer oils with trace moisture contents of 20ug / g, 30ug / g, and 40ug / g.

[0057] The sealed filling and weighing device includes a control module; the control module is pre-programmed with a control program for preparing a series of standard trace moisture transformer oil components; the input terminal of the control module is electrically connected to the weight sensor; and the output terminal of the control module is electrically connected to the input terminals of the first micro solenoid valve, the second micro solenoid valve, the third micro solenoid valve, the micro drive motor, the micro ultrasonic generator, etc.

[0058] In the field of transformer oil testing for power systems, this invention is the first to introduce a method that involves adding a very small percentage of methanol as a co-solvent to transformer oil as an intermediate transitional dissolution medium. This method prepares a standard trace moisture transformer oil sample containing the majority of the components. Simultaneously, a small-package filling device for preparing this standard trace moisture transformer oil was designed. This invention solves the problem of deviations in traditional testing methods that use pure water as a standard sample to detect trace moisture content in transformer oil. It provides an accurate, convenient, economical, and efficient calibration standard oil sample for both offline and online testing of trace moisture content in transformer oil, providing strong testing and supervision guarantees for ensuring the safe operation of high-voltage oil-filled power equipment.

[0059] In the field of transformer oil testing in power systems, this invention is the first to solve the problem of pure water being difficult to dissolve directly in transformer oil, thus making it impossible to prepare standard transformer oil samples with trace water content. It overcomes the shortcomings of current methods that use standard methanol samples containing trace water to calibrate trace water analyzers, which can easily lead to deviations in the measured trace water content of transformer oil. This invention provides accurate, convenient, economical, and efficient calibration standard samples for both offline and online testing of transformer oil trace water content, providing strong testing and supervision guarantees for ensuring the safe operation of high-voltage oil-filled power equipment.

[0060] The main advantages of this invention are as follows:

[0061] 1) Within a certain range of trace water content, by metering and adding methanol, which accounts for a very small percentage of the components, to the transformer oil as a co-solvent, a standard trace water transformer oil sample containing the absolute majority of the components can be prepared.

[0062] 2) Develop a sealed filling and weighing device that can integrate an ultrasonic probe with a curved mirror surface that matches the inner wall of the piston cylinder;

[0063] 3) In the field of transformer oil testing in power systems, a production method for a sealed small packaging device for standard trace moisture transformer oil samples was designed;

[0064] 4) A better method for preparing standard trace moisture transformer oil samples;

[0065] 5) Better preparation methods for standard trace moisture transformer oil samples and sealed small packaging methods. Attached Figure Description

[0066] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0067] Appendix Figure 1 This is a schematic diagram of a sealed filling and weighing device;

[0068] Appendix Figure 2 This is a schematic diagram illustrating the configuration and operation of the sealed filling and weighing device;

[0069] Appendix Figure 3 This is a schematic diagram of the sealing, metering, and filling of small-package plastic tubes by the sealing and filling weighing device.

[0070] Appendix Figure 4 This is a schematic diagram showing the parallel electrical connection between the ultrasonic probes of each matching curvature mirror and the miniature ultrasonic generator.

[0071] Appendix Figure 5 This is a schematic diagram of a small packaged plastic tube and a micro-syringe;

[0072] Appendix Figure 6 This is a schematic diagram of the control module's control program.

[0073] In the diagram: 1-Weight sensor; 2-Piston column; 3-Piston cylinder; 4-Matching arc mirror ultrasonic probe; 5-First miniature solenoid valve; 6-Second miniature solenoid valve; 7-Third miniature solenoid valve; 8-Stainless steel filling hard tube; 9-Miniature bidirectional drive motor; 10-Drive rod; 11-Micro syringe; 12-Standard trace moisture transformer oil; 13-First slender plastic tube; 14-Small packaged plastic tube; 15-Second slender plastic tube; 16-Miniature ultrasonic generator. Detailed Implementation

[0074] As shown in the figure, a method for preparing standard transformer oil with trace moisture includes the following steps;

[0075] Step S1: First, a small proportion of methanol or alcohol solvent is added to high-purity transformer oil as a co-solvent to form a formulation oil. The main component of the formulation oil is transformer oil. The co-solvent makes trace amounts of water more easily soluble in the transformer oil.

[0076] Step S2: Add a trace amount of water to the quantitatively prepared oil, seal and stir evenly to form standard trace water transformer oil;

[0077] Step S3: Measure and add pure water to the corresponding precisely weighed oil according to the different proportions of pure water components in the oil to prepare a series of standard trace moisture transformer oils with different contents of trace water components.

[0078] Step S4: The series of standard trace moisture transformer oils from step S3 are sealed and metered into small plastic tubes for single use, and then heat-sealed into small packages as standard samples of trace moisture transformer oils for single use.

[0079] The alcohol solvent is high-purity methanol;

[0080] In step S3, the filling process uses a hot melt clamp, a precision graduated micro-water syringe with a long needle, and a sealed filling and weighing device;

[0081] The small package plastic tube is a tube with closed top and bottom openings, formed by molding high-quality transparent organic plastic. The lower part of the tube is connected to a first slender plastic tube with marked graduations, and the upper part of the tube is connected to a second slender plastic tube with marked graduations. Both the first and second slender plastic tubes are connected to the inner cavity of the tube. The first slender plastic tube can be inserted into the filling stainless steel tube of the sealing filling and weighing device and kept tightly sealed.

[0082] In step S3, the sealing and filling weighing device fills the prepared standard micro-water content transformer oil into the inner cavity of the tube through the first slender plastic tube while maintaining a sealed state. After filling, the marked scale part of the first slender plastic tube that is not inserted into the filling hard tube is sealed by heat fusion clamp.

[0083] The second slender plastic tube is used for venting and oil overflow after standard trace moisture transformer oil is filled into the inner cavity of the plastic tube.

[0084] After the tubular tube is filled with oil, the second slender plastic tube is sealed with a heat-melting clamp at the marked scale. The marked scale of the slender plastic tube serves to uniformly measure the standard micro-water content of transformer oil in the inner cavity of the plastic tube.

[0085] In step S3, a precision-calibrated micro-water syringe is used to meter and inject high-purity water into the prepared oil.

[0086] In step S3, pure water is measured and added to the corresponding precisely weighed oil according to the pure water components of 10ug / g, 20ug / g, 30ug / g, and 40ug / g, respectively, to prepare a series of standard trace moisture transformer oils with trace water components of 10ug / g, 20ug / g, 30ug / g, and 40ug / g; these are supplied to power system transformer oil laboratories or substations for preventive testing.

[0087] A standard trace moisture transformer oil preparation device is used in the above-described standard trace moisture transformer oil preparation method. The sealed filling and weighing device includes: a precision weight sensor, a piston filler, a miniature bidirectional drive motor, a first miniature solenoid valve, a second miniature solenoid valve, a third miniature solenoid valve, a miniature ultrasonic generator, a miniature ultrasonic matching arc mirror probe, and a hot melt clamp.

[0088] The piston filler includes a piston column and piston cylinder structure made of high-quality stainless steel. The piston filler is placed on top of a precision weight sensor. A first micro solenoid valve is installed at the center of the top of the piston cylinder of the filler. The first micro solenoid valve is connected to a micro tee.

[0089] The straight end of the miniature tee is connected to a second miniature solenoid valve, the side end of the miniature tee is connected to a third miniature solenoid valve, and the other end of the second miniature solenoid valve is connected to a stainless steel filling hard tube.

[0090] Stainless steel filling hard tubes are used to fit into the first slender plastic tube with graduations in a small packaged plastic tube body.

[0091] The other end of the third miniature solenoid valve is connected to a connector for injecting high-purity transformer oil.

[0092] The piston cylinder of the filling device is inlaid with several miniature matching arc-shaped ultrasonic probes. The matching arc-shaped ultrasonic probes are integrated with the arc wall of the piston cylinder to avoid affecting the piston's pulling and pulling movement inside the piston cylinder and to ensure a seal.

[0093] Each matching curvature mirror ultrasonic probe is electrically connected in parallel to a miniature ultrasonic generator. The ultrasonic waves emitted by the miniature ultrasonic generator are transmitted into the piston cylinder through the matching curvature mirror ultrasonic probes, which oscillate and stir the standard trace amount of water transformer oil in the piston cylinder to make it uniform.

[0094] A miniature bidirectional drive motor is mounted on the outside of the piston cylinder. The miniature bidirectional drive motor drives the piston rod of the piston filler to reciprocate through a drive rod connected to the piston rod.

[0095] The method for preparing and filling 5 kg of standard trace moisture transformer oil with a trace moisture content of 10 ug / g under a constant temperature and humidity environment includes the following steps:

[0096] Step A1: Add 50g of high-purity methanol as a co-solvent to 4950g of high-purity transformer oil at a weight ratio of 1% of the transformer oil, and dissolve it evenly to form 5kg of prepared oil.

[0097] Step A2: Input the parameters required to prepare 5 kg of standard trace moisture transformer oil with a trace moisture content of 10 ug / g into the control module of the sealed filling and weighing device;

[0098] Step A3: Connect the connecting pipe of the third miniature solenoid valve 7. The other end of the connecting pipe is used to enter the mixing oil.

[0099] Step A4: Sequentially open the third micro solenoid valve and the first micro solenoid valve 5 of the sealed filling and weighing device;

[0100] Step A5: Turn on the micro bidirectional drive motor 9, and pull the piston rod 2 through the drive rod 10 to allow a small amount of prepared oil to enter the piston cylinder 3 through the third micro solenoid valve and the first micro solenoid valve for cleaning.

[0101] Step A6: When the miniature bidirectional drive motor pulls the piston rod to the set length via the drive rod, the third miniature solenoid valve is closed.

[0102] Step A7: Open the second micro solenoid valve 6, reverse the direction of the bidirectional micro drive motor, and slowly discharge the air and cleaning oil in the piston cylinder through the second micro solenoid valve until the drive piston column is pushed to the top of the piston cylinder to complete the cleaning process.

[0103] Step A8: Close the miniature bidirectional drive motor and the second miniature solenoid valve;

[0104] Step A9: Turn on the precision weight sensor 1;

[0105] Step A10: Open the third miniature solenoid valve;

[0106] Step A11: Turn on the micro bidirectional drive motor, pull the piston through the drive rod, and slowly draw the prepared oil into the piston cylinder through the third micro solenoid valve and the first micro solenoid valve.

[0107] Step A12: When the set weight value of 5kg is reached, close the third micro solenoid valve and the micro bidirectional drive motor;

[0108] Step A13: Turn off the precision weight sensor and disconnect the oil connection pipe on the third miniature solenoid valve;

[0109] Step A14: Open the second miniature solenoid valve;

[0110] Step A20: Pass the long needle of the precision graduated micro water injector 11 through the second micro solenoid valve and the first micro solenoid valve;

[0111] Step A21: Push the precision graduated micro water injector to slowly inject pure water into the piston cylinder and mix it with the high-purity transformer oil in the piston cylinder;

[0112] Step A22: When the precision-calibrated micro-water syringe reaches the scale value of 0.05ml, remove the precision-calibrated micro-water syringe, close the first micro solenoid valve and the second micro solenoid valve. Assuming that 0.05ml of pure water is negligible compared to the volume of 5kg of prepared oil, take the density of pure water at 4°C as 1g / ml, or calculate the water density based on the preparation temperature, and calculate that the standard trace moisture transformer oil prepared at this time contains 10ug / g of trace water.

[0113] Step A23: Turn on the miniature ultrasonic generator 16. The ultrasonic waves emitted by the several matching arc-shaped mirror ultrasonic probes 4 embedded in the inner wall of the piston cylinder are sent into the piston cylinder to oscillate and stir the transformer oil in the piston cylinder, thereby accelerating the mixing and dissolution of pure water and the prepared oil.

[0114] Step A24: After the set time is reached, turn off the ultrasonic generator. After the sealed filling weighing device has stood still for the set time, you can start the small-package sealing and filling of the standard trace moisture transformer oil sample with a trace moisture content of 10ug / g.

[0115] After changing the component ratio, the above steps can be used to prepare a series of standard trace moisture transformer oils with trace moisture contents of 20ug / g, 30ug / g, and 40ug / g.

[0116] The process of filling disposable small plastic tubes with standard trace moisture transformer oil with a trace moisture content of 10ug / g and then heat-sealing them includes the following steps:

[0117] Step B1: Install the stainless steel filling hard tube 8 onto the piston cylinder second miniature solenoid valve connector;

[0118] Step B2: Insert the first slender plastic tube 13 at the bottom of the disposable small package plastic tube 14 into the stainless steel filling hard tube in the center of the piston cylinder, and keep it tightly sealed.

[0119] Step B3: Turn on the miniature bidirectional drive motor and push the piston rod through the drive rod;

[0120] Step B4: Open the first micro solenoid valve and the second micro solenoid valve. The standard trace amount of water and transformer oil 12 in the piston cylinder will slowly be injected into the plastic tube body through the first micro solenoid valve, the second micro solenoid valve, and the first slender plastic tube of the plastic tube body, and the air will be discharged through the second slender plastic tube 15 of the plastic tube body.

[0121] Step B5: When the second slender plastic tube of the plastic tube body has exhausted the air and oil begins to overflow, close the second micro solenoid valve, the first micro solenoid valve, and the micro bidirectional drive motor in sequence.

[0122] Step B6: Use heat fusion clamps to heat fuss and seal the graduations of the first and second slender plastic tubes respectively;

[0123] Step B7: Remove the small packaged plastic tube from the stainless steel filling hard tube, as well as the excess thin plastic tube portion;

[0124] Step B8: Continue with the process of filling the next small package of disposable plastic tubes with standard trace moisture transformer oil;

[0125] After changing the component ratio, the above steps can be used for the sealing and filling of a series of standard trace moisture transformer oils with trace moisture contents of 20ug / g, 30ug / g, and 40ug / g.

[0126] The sealed filling and weighing device includes a control module; the control module is pre-programmed with a control program for preparing a series of standard trace moisture transformer oil components; the input terminal of the control module is electrically connected to the weight sensor; and the output terminal of the control module is electrically connected to the input terminals of the first micro solenoid valve, the second micro solenoid valve, the third micro solenoid valve, the micro drive motor, the micro ultrasonic generator, etc.

Claims

1. A standard micro moisture transformer oil formulation method characterized by: The method comprises the following steps; Step S1, a small amount of methanol or alcohol solvent is added into high-purity transformer oil as a cosolvent to form a configuration oil, the main component of the configuration oil is transformer oil, and the cosolvent makes the trace amount of water more easily dissolved in the transformer oil; Step S2, a trace amount of water is added into the quantitative configuration oil, and the standard trace water transformer oil is formed after sealing and uniform stirring; Step S3, according to different proportions of pure water components containing trace water in the configuration oil, the pure water is measured and added into the corresponding accurately weighed configuration oil to form a series of standard trace water transformer oils with different contents of trace water components; Step S4, the series of standard trace water transformer oils in step S3 are sealed, metered and filled into small packaging plastic tube bodies, and then are heat-sealed to be packaged into small packaging specifications as one-time-use trace water transformer oil standard samples; The alcohol solvent is high-purity methanol; In step S3, a hot melt clamp, a precision scale micro water injector with a long needle and a sealed filling weighing device are used in the filling process; The small packaging plastic tube body is an upper and lower port closed tube body formed of transparent organic plastic, a first slender plastic tube with a marked scale is connected to the lower part of the tube body, a second slender plastic tube with a marked scale is connected to the upper part of the tube body, the first slender plastic tube and the second slender plastic tube are both communicated with the inner cavity of the tube body, the first slender plastic tube can be inserted into the filling stainless steel tube of the sealed filling weighing device and kept in a tight seal state; In step S3, the sealed filling weighing device keeps the sealed state, fills the standard micro water content transformer oil which has been configured into the inner cavity of the tube body through the first slender plastic tube, and after the filling is completed, the first slender plastic tube is heat-sealed at the marked scale of the part which is not inserted into the filling hard tube by the hot melt clamp; The second slender plastic tube is used for exhaust and oil overflow after the standard trace water transformer oil is filled into the inner cavity of the plastic tube body; When the filling of the oil into the inner cavity of the tubular tube body is completed, the second slender plastic tube is heat-sealed at the marked scale by the hot melt clamp, and the marked scale of the slender plastic tube plays a role in uniformly metering the standard micro water content transformer oil in the inner cavity of the plastic tube body; In step S3, the precision scale micro water injector is used for metering and injecting high-purity water into the configuration oil.

2. A method of formulating a standard trace moisture transformer oil according to claim 1, characterized in that: In step S3, according to the pure water components containing 10ug / g, 20ug / g, 30ug / g and 40ug / g of trace water in the configuration oil, the pure water is measured and added into the corresponding accurately weighed configuration oil to form a series of standard trace water transformer oils with the contents of 10ug / g, 20ug / g, 30ug / g and 40ug / g of trace water components; the standard trace water transformer oils are provided for the detection test of the power system transformer oil test room or the preventive test of the substation.

3. A standard trace moisture transformer oil formulation device for implementing the standard trace moisture transformer oil formulation method of claim 1, characterized by: The sealed filling weighing device comprises an accurate weight sensor, a piston filler, a micro bidirectional drive motor, a first micro electromagnetic valve, a second micro electromagnetic valve, a third micro electromagnetic valve, a micro ultrasonic wave generator, a micro ultrasonic wave anastomosis arc mirror probe and a hot melt clamp. The piston filler comprises a piston column made of stainless steel, a piston cylinder structure, the piston filler is placed on a precise weight sensor, a first micro electromagnetic valve is installed at the top center of the piston cylinder of the filler, and the first micro electromagnetic valve is connected with a micro three-way pipe; The straight pipe end of the micro three-way pipe is connected with a second micro electromagnetic valve, the side pipe end of the micro three-way pipe is connected with a third micro electromagnetic valve, and the other end of the second micro electromagnetic valve is connected with a stainless steel filling hard tube; The stainless steel filling hard tube is used for sleeving a first slender plastic tube with a scale on a small plastic tube body; The other end of the third micro electromagnetic valve is connected with a joint for injecting high-purity transformer oil; A plurality of micro anastomosis radian mirror surface ultrasonic probes are inlaidly installed on the inner wall of the piston cylinder, the micro anastomosis radian mirror surface ultrasonic probes are integrated with the circular arc wall of the piston cylinder to avoid affecting the pulling movement of the piston in the piston cylinder and to ensure sealing; The micro anastomosis radian mirror surface ultrasonic probes are electrically connected in parallel to a micro ultrasonic generator, the ultrasonic waves emitted by the micro ultrasonic generator are emitted to the piston cylinder through the micro anastomosis radian mirror surface ultrasonic probes, and the standard trace moisture transformer oil arranged in the piston cylinder is oscillated and stirred to be uniform; A micro bidirectional driving motor is installed outside the piston cylinder, the micro bidirectional driving motor drives the piston column of the piston filler to make reciprocating movement through a driving rod connected with the piston column.

4. A standard micro moisture transformer oil formulation device as claimed in claim 3, wherein: The method for preparing and filling 5kg standard trace moisture transformer oil with a moisture content of 10ug / g in a constant temperature and humidity environment by the preparation device comprises the following steps: Step A1, 50g high-purity methanol as a cosolvent is added to 4950g high-purity transformer oil according to 1% of the weight of the transformer oil, and after uniform dissolution, 5kg preparation oil is formed; Step A2, the parameters required for preparing 5kg standard trace moisture transformer oil with a moisture content of 10ug / g are input into the control module of the sealed filling weighing device; Step A3, the joint connecting pipe of the third micro electromagnetic valve (7) is connected, and the other end of the connecting pipe is used for feeding the preparation oil; Step A4, the third micro electromagnetic valve and the first micro electromagnetic valve (5) of the sealed filling weighing device are opened in sequence; Step A5, the micro bidirectional driving motor (9) is opened, the piston column (2) is pulled through the driving rod (10), and a small amount of preparation oil is fed into the piston cylinder (3) through the third micro electromagnetic valve and the first micro electromagnetic valve for cleaning; Step A6, when the micro bidirectional driving motor pulls the piston column to the set length through the driving rod, the third micro electromagnetic valve is closed; Step A7, the second micro electromagnetic valve (6) is opened, the driving direction of the bidirectional micro driving motor is reversely opened, the air and cleaning oil in the piston cylinder are slowly discharged through the second micro electromagnetic valve until the piston column is driven to the top of the piston cylinder, and the cleaning process is completed; Step A8, the micro bidirectional driving motor and the second micro electromagnetic valve are closed; Step A9, the precise weight sensor (1) is opened; Step A10, the third micro electromagnetic valve is opened; Step A11, the micro bidirectional driving motor is opened, the piston is pulled through the driving rod, and the preparation oil is slowly drawn into the piston cylinder through the third micro electromagnetic valve and the first micro electromagnetic valve. Step A12, to set the weight of 5 kg, close the third micro electromagnetic valve, micro bidirectional drive motor; Step A13, close the precise weight sensor, remove the third micro electromagnetic valve on the configuration of oil connection pipe; Step A14, open the second micro electromagnetic valve; Step A20, the precision scale micro water injector (11) long needle through the second micro electromagnetic valve, the first micro electromagnetic valve; Step A21, push the precision scale micro water injector, slowly inject pure water into the piston cylinder, and mix with the high-purity transformer oil in the piston cylinder; Step A22, when the precision scale micro water injector reaches 0.05 ml, remove the precision scale micro water injector, close the first micro electromagnetic valve and the second micro electromagnetic valve. The 0.05 ml of pure water compared to the volume of 5 kg of configuration oil can be ignored. The density of pure water at 4℃ is 1 g / ml, or the water density is calculated by the configuration temperature. The calculation shows that the standard micro water content transformer oil prepared at this time contains 10 ug / g of micro water; Step A23, open the micro ultrasonic generator (16), and emit ultrasonic waves through the several anastomotic arc mirror ultrasonic probes (4) embedded in the inner wall of the piston cylinder, which are emitted to the inside of the piston cylinder body to play a role in stirring and mixing the transformer oil in the piston cylinder body, and accelerate the mixing and dissolution of pure water and configuration oil; Step A24, after reaching the set time, close the ultrasonic generator. After the sealed filling weighing device is placed for the set time, the standard micro water content transformer oil sample with 10 ug / g of micro water content can be sealed and packaged; After changing the component ratio, the above steps can be used to prepare a series of standard micro water content transformer oils with 20 ug / g, 30 ug / g, and 40 ug / g of micro water content.

5. A standard micro moisture transformer oil formulation device as claimed in claim 4, wherein: The process of sealing, metering, and filling the standard micro water content transformer oil with 10 ug / g of micro water content into a one-time small package plastic tube and heat sealing the packaged process includes the following steps: Step B1, install the stainless steel filling hard tube (8) on the second micro electromagnetic valve joint of the piston cylinder; Step B2, insert the first slender plastic tube (13) at the bottom of the one-time small package plastic tube body (14) into the stainless steel filling hard tube in the center of the piston cylinder, and keep it tightly sealed; Step B3, open the micro bidirectional drive motor, and push the piston column through the drive rod; Step B4, open the first micro electromagnetic valve and the second micro electromagnetic valve. The standard micro water content transformer oil (12) in the piston cylinder starts to slowly flow into the plastic tube body through the first micro electromagnetic valve, the second micro electromagnetic valve, and the first slender plastic tube of the plastic tube body, and the air is discharged through the second slender plastic tube (15) of the plastic tube body; Step B5, when the second slender plastic tube of the plastic tube body starts to overflow oil after discharging the air, sequentially close the second micro electromagnetic valve, the first micro electromagnetic valve, and the micro bidirectional drive motor; Step B6, use a hot melt clamp to heat seal the first slender plastic tube and the second slender plastic tube at the scale respectively; Step B7, remove the small package plastic tube body from the stainless steel filling hard tube, and the excess slender plastic tube part; Step B8, continue to fill the next small package of disposable plastic tube body with standard micro water transformer oil; After changing the component ratio, the above steps can be used for the sealing and filling of a series of standard micro water transformer oils with 20ug / g, 30ug / g, 40ug / g micro water content.

6. A standard micro moisture transformer oil formulation device as claimed in claim 3, wherein: The sealing and filling weighing device comprises a control module; the control module is preprogrammed with a control program for preparing a series of component standard micro water transformer oils, the input end of the control module is electrically connected to the weight sensor, and the output end of the control module is respectively electrically connected to the input end of the first micro electromagnetic valve, the second micro electromagnetic valve, the third micro electromagnetic valve, the micro driving motor and the micro ultrasonic generator.

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