Device and method for preparing blank oil of transformer insulating oil

Abstract

The invention relates to a blank oil preparation device and method for transformer insulating oil, the device comprises a first oil preparation unit, a second oil preparation unit and a first solenoid valve, and the second oil preparation unit and the first oil preparation unit have the same structure; the first oil production unit comprises a first oil tank, a first stirring pump and a first vacuum pump; the second oil production unit comprises a second oil tank; the first oil tank is connected with the second oil tank in series through the first electromagnetic valve, the first stirring pump and the first vacuum pump are connected with the first oil tank in parallel, a first oil inlet and a first oil outlet are formed in the first oil tank, and the second oil tank and the first oil tank are identical in structure. The first electromagnetic valve is opened, and the first oil preparation unit and the second oil preparation unit both prepare blank oil; the first electromagnetic valve is closed, the first oil preparation unit or the second oil preparation unit is used for preparing blank oil, the other oil preparation unit is used for recycling waste oil, and then the waste oil is prepared into the blank oil. Compared with the prior art, the oil production quantity can be adjusted, and waste oil recovery has the advantages of high operability, high oil production efficiency and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of transformers, and in particular to a device and method for preparing blank oil of transformer insulating oil. Background Art

[0002] Oil-immersed electrical equipment (transformers, high-voltage reactors, converter transformers, etc.) is a key primary component of power grids. Its operating condition directly impacts the safety and stability of the power system. Internal defects can be detected using online dissolved gas in oil (DGA) monitoring devices. Chromatographic analysis of DGA in transformer oil has effectively prevented numerous serious accidents within power grid systems. Therefore, the accuracy and reliability of this device's performance are crucial for monitoring internal defects in primary equipment.

[0003] At present, in accordance with management regulations and technical requirements, the online monitoring equipment for dissolved gas in oil is mainly calibrated on site, or the relevant detection equipment is calibrated in the laboratory based on the same oil sample to grasp the accuracy of its monitoring data. The implementation methods include: before commissioning, it is necessary to carry out handover tests on the equipment, such as minimum detection concentration test, measurement error test, cross-sensitivity test and repeatability test; measurement error tests need to be carried out regularly during operation.

[0004] For example, the invention with publication number CN112432830A discloses a device and method for preparing a blank oil sample of transformer insulating oil, which includes a purge chamber for containing insulating oil, a gas input component for inputting inert gas into the purge chamber, a gas discharge component for exhausting gas into the purge chamber, and an oil sample output component connected to the purge chamber for sampling and oil treatment. The gas input component inputs gas into the purge chamber to bubble and purge the insulating oil, and after bubbling and purge, the oil sample is pressed into the oil sample output component.

[0005] For example, the utility model with publication number CN219302372U discloses a transformer blank oil and standard oil sample configuration device, including an oil cylinder, a piston rod is provided in the oil cylinder, the piston rod is connected to a first solenoid valve and a seventh solenoid valve, a second vacuum pump and a second circulating pump are garbage, a sixth solenoid valve is provided on the second circulating pump, the second circulating pump is connected to the inner wall of the oil cylinder through a second pressure sensor; the seventh solenoid valve is connected to the first circulating pump, and the first circulating pump is connected to an argon gas bottle through a fourth solenoid valve; the first vacuum pump is connected to the second vacuum pump and the first circulating pump through a third solenoid valve, the standard gas bottle is connected to an injection pump, and the injection pump is connected to the oil cylinder through a fifth solenoid valve, a second temperature sensor.

[0006] However, these existing preparation devices cannot stably and quantitatively control the degree of dissolved gas removal from insulating oil. When taking blank oil samples, operability is poor and they are easily exposed to air, contaminating the oil sample and affecting test results. Furthermore, the lack of device protection can easily lead to container rupture and liquid splashing. In particular, CN219302372U also performs standard gas mixing, a method that has proven unsuitable for field engineering.

[0007] In addition, waste oil will be generated during the inspection process (the definition of waste oil: the oil formed after blank oil is mixed with characteristic gas, which should be distinguished from waste oil in the common sense). The standard recommends using waste oil barrels to recycle it, but this part of the oil will not be able to directly participate in the standard oil and its calibration process again, resulting in a certain degree of waste.

[0008] In summary, the existing blank oil preparation devices for transformer insulating oil are generally unsuitable for on-site engineering. They are difficult to operate when taking blank oil samples, easily contaminating the blank oil. Furthermore, they cannot effectively recycle and reuse the waste oil, resulting in a certain degree of waste and increasing preparation costs. Summary of the Invention

[0009] The purpose of the present invention is to provide a blank oil preparation device and method for transformer insulating oil in order to overcome the defects of the above-mentioned prior art, such as low blank oil configuration efficiency and poor reliability and operability, and unsuitability for blank oil configuration in on-site engineering.

[0010] The purpose of the present invention can be achieved by the following technical solutions:

[0011] This solution provides a blank oil preparation device for transformer insulating oil, comprising a first oil preparation unit, a second oil preparation unit and a first solenoid valve, wherein the second oil preparation unit has the same structure as the first oil preparation unit;

[0012] The first oil production unit includes a first oil tank, a first stirring pump and a first vacuum pump, and the second oil production unit includes a second oil tank;

[0013] The first oil tank is connected in series with the second oil tank via a first solenoid valve, the first stirring pump and the first vacuum pump are respectively connected in parallel with the first oil tank, the first oil tank is provided with a first oil inlet and a first oil outlet, and the second oil tank has the same structure as the first oil tank;

[0014] The first solenoid valve is opened, and the first oil production unit and the second oil production unit both prepare blank oil;

[0015] The first solenoid valve is closed, the first oil-making unit or the second oil-making unit prepares blank oil, and the other oil-making unit is used to recycle waste oil, and subsequently prepare blank oil from the waste oil.

[0016] Preferably, the first oil-making unit further includes a first pressure plate, a No. 1 three-way valve, a second solenoid valve, a No. 2 three-way valve, a No. 3 three-way valve and a third solenoid valve;

[0017] One end of the first vacuum pump is connected to the air circuit of the first oil tank, and the other end is connected to the first pressure plate, and the first pressure plate is connected to the first oil tank through three-way valve No. 1; one end of the second solenoid valve is connected to three-way valve No. 1, and the other end is connected to three-way valve No. 2, one end of the first stirring pump is connected to three-way valve No. 2, and the other end is connected to three-way valve No. 3, one end of the third solenoid valve is connected to three-way valve No. 3, and the other end is connected to the first oil tank, and one end of the first solenoid valve is connected to three-way valve No. 3.

[0018] Preferably, the first oil-making unit further includes a fourth solenoid valve, one end of which is connected to the No. 2 three-way valve, and the other end of which is detachably connected to the external oil chamber.

[0019] Preferably, the oil inlet of the first oil tank is provided with a first oil inlet valve, and the oil outlet of the first oil tank is provided with a fifth solenoid valve.

[0020] Preferably, the blank oil preparation process of the first oil preparation unit and the second oil preparation unit is the same, and the blank oil preparation process of the first oil preparation unit is:

[0021] Close the fifth solenoid valve, the sixth solenoid valve, the fourth solenoid valve and the first solenoid valve to seal the first fuel tank from the inside and outside; open the second solenoid valve and the third solenoid valve;

[0022] Start the first stirring pump to stir the oil to form an oil mist with a sufficiently small particle size for molecular sieve degassing; start the first vacuum pump to extract the gas from the first oil tank, and set the target pressure in the first oil tank; when the pressure in the first oil tank reaches the target pressure, the oil in the first oil tank is degassed and dehydrated, and the preparation of blank oil is completed.

[0023] Preferably, the oil inlet of the second oil tank is provided with a second oil inlet valve, the oil outlet of the second oil tank is provided with a sixth solenoid valve, and the outlet ends of the sixth solenoid valve and the fifth solenoid valve are connected through a No. 4 three-way valve.

[0024] Preferably, the second oil-making unit includes a second vacuum pump, a second pressure plate, a No. 5 three-way valve, a seventh solenoid valve, a No. 6 three-way valve, a second stirring pump, a No. 7 three-way valve and an eighth solenoid valve;

[0025] One end of the second vacuum pump is connected to the second oil tank, and the other end is connected to the second pressure plate; one end of the No. 5 three-way valve is connected to the second pressure plate, and the other end is connected to the second oil tank;

[0026] One end of the seventh solenoid valve is connected to three-way valve No. 5, and the other end is connected to three-way valve No. 6. The two ends of the second stirring pump are respectively connected to three-way valve No. 6 and three-way valve No. 7. One end of the eighth solenoid valve is connected to three-way valve No. 7, and the other end is connected to the second oil tank. The first solenoid valve is connected to the second oil tank through three-way valve No. 6.

[0027] Preferably, the second oil control unit further includes a ninth solenoid valve, one end of which is connected to the No. 6 three-way valve, and the other end of which is detachably connected to the external oil chamber.

[0028] Preferably, the first oil production unit and the second oil production unit have the same waste oil recovery process, and the specific process of the second oil production unit for waste oil recovery is:

[0029] Close the sixth solenoid valve, the first solenoid valve and the ninth solenoid valve, open the second oil inlet valve, and connect the oil inlet of the second oil tank to the waste oil pipe;

[0030] Recover the waste oil into the second oil tank until all the waste oil is collected and close the second oil inlet valve;

[0031] Start the blank oil preparation process of the second oil-making unit to convert the waste oil in the second oil tank into qualified blank oil, and complete the recovery and reuse of the waste oil.

[0032] This solution also provides a method for preparing a blank oil preparation device for transformer insulating oil, comprising the following steps:

[0033] Confirm the actual amount of blank oil required for transformer insulating oil and compare the actual amount with the threshold oil amount;

[0034] If the actual oil usage is greater than the threshold oil amount, the first solenoid valve is opened, and the first oil production unit and the second oil production unit jointly prepare blank oil; otherwise, the first solenoid valve is closed, and the first oil production unit or the second oil production unit prepares blank oil;

[0035] Confirm whether waste oil recovery is required. If so, close the first solenoid valve and use the first oil-making unit and the second oil-making unit for waste oil recovery. Close the oil outlet of the oil-making unit and connect the oil inlet to the waste oil pipe. After collection is completed, close the oil inlet and start the blank oil preparation process to convert the waste oil into blank oil that meets the requirements.

[0036] Compared with the prior art, the present invention has the following advantages:

[0037] (1) This solution uses a solenoid valve to connect the first oil production unit and the second oil production unit in series. The first and second oil production units are connected to the new transformer. By opening the first solenoid valve, blank oil for the transformer can be prepared through the first and second oil production units at the same time. The simultaneous preparation of two circuits can effectively reduce the time for preparing blank oil in advance and improve the efficiency of oil preparation. In addition, according to the actual oil consumption demand of the transformer, the first solenoid valve can be closed and oil can be prepared through a single oil tank, so that the volume of the prepared oil can be flexibly adjusted to avoid the waste of blank oil, and the operability is strong.

[0038] (2) This solution sets corresponding solenoid valves at each oil outlet of the oil tank. After all the solenoid valves at the oil outlet are closed, the corresponding oil tank can be used as a waste oil container. After the waste oil is collected, the oil inlet is closed, and the vacuum pump and stirring pump are started to re-prepare the waste oil into blank oil, thus realizing the reuse of the waste oil. This avoids the waste of waste oil, reduces the cost of preparing blank oil, avoids waste, expands the scope of application of the oil preparation unit, and is more practical.

[0039] (3) This solution provides an oil circuit connecting the first and second oil-making units to the external oil chamber, and provides corresponding solenoid valves on the oil circuit to control the opening and closing of the oil circuit. This facilitates the storage of the prepared blank oil, further avoiding waste of blank oil and reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 A schematic diagram of the internal oil circuit of the blank oil preparation device provided by the present invention;

[0041] Figure 2 A schematic structural diagram of the first oil tank of the preparation device provided by the present invention;

[0042] Figure 3 A front view of the first fuel tank and the second fuel tank structure provided by the present invention;

[0043] In the figure: 1, first oil tank, 2, second oil tank, 3, first solenoid valve, 4, first stirring pump, 5, first vacuum pump, 6, first pressure plate, 7, three-way valve No. 1, 8, second solenoid valve, 9, three-way valve No. 2, 10, three-way valve No. 3, 11, third solenoid valve, 12, fourth solenoid valve, 13, first oil inlet valve, 14, fifth solenoid valve, 15, second oil inlet valve, 16, sixth solenoid valve, 17, three-way valve No. 4, 18, second vacuum pump, 19, second pressure plate, 20, three-way valve No. 5, 21, seventh solenoid valve, 22, three-way valve No. 6, 23, second stirring pump, 24, three-way valve No. 7, 25, eighth solenoid valve, 26, ninth solenoid valve, 27, insulation layer. DETAILED DESCRIPTION

[0044] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of 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. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0045] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0046] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0047] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limiting the present invention.

[0048] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0049] Furthermore, terms such as "horizontal" and "vertical" do not necessarily mean that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0050] Example 1

[0051] like Figure 1 and Figure 2As shown, this embodiment provides a blank oil preparation device for transformer insulating oil, comprising a first oil preparation unit, a second oil preparation unit and a first solenoid valve 3. The second oil preparation unit has the same structure as the first oil preparation unit.

[0052] The first oil production unit includes a first oil tank 1, a first stirring pump 4 and a first vacuum pump 5, and the second oil production unit includes a second oil tank 2;

[0053] The first oil tank 1 is connected in series with the second oil tank 2 via a first solenoid valve 3. The first stirring pump 4 and the first vacuum pump 5 are respectively connected in parallel with the first oil tank 1. The first oil tank 1 is provided with a first oil inlet and a first oil outlet. The second oil tank 2 has the same structure as the first oil tank 1.

[0054] The first solenoid valve 3 is opened, and both the first oil production unit and the second oil production unit prepare blank oil;

[0055] The first solenoid valve 3 is closed, and the first oil-making unit or the second oil-making unit prepares blank oil. The other oil-making unit is used to recycle waste oil, and subsequently prepares blank oil from the waste oil.

[0056] In this embodiment, the first oil production unit further includes a first pressure plate 6, a No. 1 three-way valve 7, a second solenoid valve 8, a No. 2 three-way valve 9, a No. 3 three-way valve 10 and a third solenoid valve 11;

[0057] One end of the first vacuum pump 5 is connected to the air circuit of the first oil tank 1, and the other end is connected to the first pressure plate 6. The first pressure plate 6 is connected to the first oil tank 1 through the three-way valve No. 1 7; one end of the second solenoid valve 8 is connected to the three-way valve No. 1 7, and the other end is connected to the three-way valve No. 2 9. One end of the first stirring pump 4 is connected to the three-way valve No. 2 9, and the other end is connected to the three-way valve No. 3 10. One end of the third solenoid valve 11 is connected to the three-way valve No. 3 10, and the other end is connected to the first oil tank 1. One end of the first solenoid valve 3 is connected to the three-way valve No. 3 10.

[0058] A solenoid valve connects the first and second oil preparation units in series. Once connected to the new transformer, opening the first solenoid valve allows for simultaneous preparation of transformer blank oil. This dual-circuit simultaneous preparation effectively reduces the time required to prepare blank oil, improving oil preparation efficiency. The first solenoid valve can be closed to allow preparation from a single tank, allowing for flexible adjustment of the volume of prepared oil and enhancing operability.

[0059] In this embodiment, the first oil-making unit further includes a fourth solenoid valve 12. One end of the fourth solenoid valve 12 is connected to the No. 2 three-way valve 9, and the other end is detachably connected to the external oil chamber. This allows the empty or unused oil in the first oil tank 1 to be stored in the external oil chamber for subsequent use, thus avoiding waste of empty oil and reducing the cost of empty oil usage.

[0060] In this embodiment, the blank oil preparation process of the first oil production unit and the second oil production unit is the same. The blank oil preparation process of the first oil production unit is:

[0061] Close the fifth solenoid valve 14, the sixth solenoid valve 16, the fourth solenoid valve 12 and the first solenoid valve 3 to seal the first fuel tank 1 from the inside and outside; open the second solenoid valve 8 and the third solenoid valve 11;

[0062] Start the first stirring pump 4 to stir the oil to form an oil mist with a sufficiently small particle size for molecular sieve degassing; start the first vacuum pump 5 to extract the gas from the first oil tank 1 and set the target pressure in the first oil tank 1; when the pressure in the first oil tank 1 reaches the target pressure, the oil in the first oil tank 1 is degassed and dehydrated, and the preparation of blank oil is completed.

[0063] In this embodiment, a first oil inlet valve 13 is provided at the oil inlet of the first oil tank 1, and a fifth solenoid valve 14 is provided at the oil outlet of the first oil tank 1. A second oil inlet valve 15 is provided at the oil inlet of the second oil tank 2, and a sixth solenoid valve 16 is provided at the oil outlet of the second oil tank 2. The outlets of the sixth solenoid valve 16 and the fifth solenoid valve 14 are connected via a No. 4 three-way valve 17.

[0064] By connecting the oil outlets of the first oil tank 1 and the second oil tank 2 and setting corresponding solenoid valves on their respective oil outlet pipelines to control the opening and closing of the corresponding oil outlet pipelines, the first oil tank 1 and the second oil tank 2 can be better coordinated to be used together or alone for preparing blank oil, thereby avoiding errors in the selection of the oil outlet of the oil making unit and the connection with the oil inlet of the transformer. Control can be achieved only through the corresponding solenoid valves, reducing the operational complexity of on-site engineering, facilitating operation, and helping to improve oil making efficiency.

[0065] In this embodiment, the second oil production unit includes a second vacuum pump 18, a second pressure plate 19, a No. 5 three-way valve 20, a seventh solenoid valve 21, a No. 6 three-way valve 22, a second stirring pump 23, a No. 7 three-way valve 24 and an eighth solenoid valve 25;

[0066] One end of the second vacuum pump 18 is connected to the second oil tank 2 , and the other end is connected to the second pressure plate 19 . One end of the No. 5 three-way valve 20 is connected to the second pressure plate 19 , and the other end is connected to the second oil tank 2 .

[0067] One end of the seventh solenoid valve 21 is connected to the three-way valve No. 5 20, and the other end is connected to the three-way valve No. 6 22. The two ends of the second stirring pump 23 are respectively connected to the three-way valve No. 6 22 and the three-way valve No. 7 24. One end of the eighth solenoid valve 25 is connected to the three-way valve No. 7 24, and the other end is connected to the second oil tank 2. The first solenoid valve 3 is connected to the second oil tank 2 through the three-way valve No. 6 22.

[0068] In this embodiment, the first oil production unit and the second oil production unit have the same waste oil recovery process. The specific process of waste oil recovery in the second oil production unit is as follows:

[0069] Close the sixth solenoid valve 16, the first solenoid valve 3 and the ninth solenoid valve 26, and open the second oil inlet valve 15 to connect the oil inlet of the second oil tank 2 to the waste oil pipe;

[0070] Recover the waste oil into the second oil tank 2 until all the waste oil is collected, and then close the second oil inlet valve 15;

[0071] The blank oil preparation process of the second oil making unit is started to convert the waste oil in the second oil tank 2 into blank oil that meets the requirements, thereby completing the recovery and reuse of the waste oil.

[0072] In this embodiment, the second oil-making unit further includes a ninth solenoid valve 26 , one end of the ninth solenoid valve 26 is connected to the No. 6 three-way valve 22 , and the other end is detachably connected to the external oil chamber.

[0073] By setting up an oil circuit connecting the first and second oil-making units to the external oil chamber and installing a corresponding solenoid valve on the oil circuit to control the opening and closing of the oil circuit, it is convenient to store the blank oil after configuration, further avoiding the waste of blank oil and reducing costs.

[0074] like Figure 3 As shown, in this embodiment, the first and second oil tanks 1 and 2 are enclosed by an insulation layer 27, within which a heating element is located. By enclosing the insulation layer 27 on the outside of the first and second oil tanks 1 and 2 and utilizing the heating element within the insulation layer 27, the oil preparation environment can be adjusted to accommodate more complex environments, thereby better adapting to on-site transformer blank oil preparation projects and achieving greater practicality.

[0075] Example 2

[0076] This embodiment is substantially the same as the first embodiment, except that this embodiment provides a method for preparing a blank oil preparation device for transformer insulating oil, which comprises the following steps:

[0077] Confirm the actual amount of blank oil required for transformer insulating oil and compare the actual amount with the threshold oil amount;

[0078] If the actual amount of oil used is greater than the threshold oil amount, the first solenoid valve 3 is opened, and the first oil production unit and the second oil production unit jointly prepare blank oil; otherwise, the first solenoid valve 3 is closed, and the first oil production unit or the second oil production unit prepares blank oil;

[0079] Confirm whether waste oil recovery is required. If so, close the first solenoid valve 3 and use the first oil-making unit and the second oil-making unit for waste oil recovery. Close the oil outlet of the oil-making unit and connect the oil inlet to the waste oil pipe. After collection is completed, close the oil inlet and start the blank oil preparation process to convert the waste oil into blank oil that meets the requirements.

[0080] In this embodiment, the specific process of preparing blank oil through the oil production circuit is as follows:

[0081] Close the fifth solenoid valve 14, the sixth solenoid valve 16, the fourth solenoid valve 12, the ninth solenoid valve 26, the first oil inlet valve 13 and the second oil inlet valve 15 to seal the first oil tank 1 and the second oil tank 2 from the inside and outside.

[0082] Close the first solenoid valve 3 to make the first oil tank 1 and the second oil tank 2 become independent oil chambers;

[0083] The preparation process of blank oil for the two fuel tanks is the same. The following takes the preparation process of the first fuel tank 1 as an example:

[0084] Confirm that the second solenoid valve 8 and the third solenoid valve 11 are conducting;

[0085] Start the first stirring pump 4 to stir the oil and form an oil mist with a sufficiently small particle size for molecular sieve degassing. It should be understood that the integration of the stirring pump and the molecular sieve is not the focus of this solution and belongs to the existing technology, so it will not be described in detail.

[0086] Start the first vacuum pump 5 to extract the gas from the first oil tank 1 to create a certain degree of vacuum in the first oil tank 1;

[0087] When the pressure in the first oil tank 1 reaches the vacuum set value, the oil in the first oil tank 1 completes the degassing and dehydration process, and the blank oil preparation is completed.

[0088] Furthermore, the ease of blank oil preparation can be controlled by opening and closing the first solenoid valve 3, and the blank oil volume can be adjusted, enabling the preparation of small-capacity blank oil. Existing blank oils require the configuration of 10L of blank oil, as specified in the aforementioned reference standard. However, actual engineering verification does not require this much, and blank oil easily loses its blank properties after being prepared and not used. Therefore, selecting either the first tank 1 or the second tank 2 as a degassing tank significantly reduces the space required for stirring and degassing, reducing energy consumption by at least 50%. The small capacity here means that the standard container does not need to be used, meaning only one oil chamber is sufficient. For the configuration process, refer to the aforementioned blank oil preparation process.

[0089] In this embodiment, both the first oil tank 1 and the second oil tank can be used as a waste oil recovery system. In this embodiment, the second oil tank 2 is used as the waste oil recovery system to illustrate the specific process of waste oil recovery:

[0090] Closing valves: the sixth solenoid valve 16, the first solenoid valve 3 and the ninth solenoid valve 26;

[0091] Connect the oil inlet of the second oil tank 2 to the waste oil pipe, open the second oil inlet valve 15, and allow the waste oil to flow into the second oil tank 2. After all the waste oil has been collected, close the second oil inlet valve 15.

[0092] By starting the blank oil preparation component of the second oil tank 2, the waste oil in the second oil tank 2 can be converted into blank oil that meets the requirements.

[0093] It can be understood that when the first solenoid valve 3 is closed, the second fuel tank 2 will not have any impact on the first fuel tank 1, and the two fuel tanks can be used independently.

[0094] Corresponding solenoid valves are installed at each oil outlet of the oil tank. After all the solenoid valves at the oil outlet are closed, the corresponding oil tank can be used as a waste oil container. After the waste oil is collected, the oil inlet is closed, and the vacuum pump and stirring pump are started to re-prepare the waste oil into blank oil, thus realizing the reuse of the waste oil. This avoids the waste of waste oil, reduces the cost of preparing blank oil, avoids waste, expands the application range of the oil preparation unit, and is more practical.

[0095] The above describes in detail the preferred embodiments of the present invention. It should be understood that those skilled in the art can make numerous modifications and variations based on the concepts of the present invention without inventive effort. Therefore, any technical solutions that can be derived by those skilled in the art through logical analysis, reasoning, or limited experimentation based on the concepts of the present invention and the prior art should be within the scope of protection defined by the claims.

Claims

1. A blank oil preparation device for transformer insulating oil, characterized in that: It comprises a first oil-making unit, a second oil-making unit and a first solenoid valve (3), wherein the second oil-making unit has the same structure as the first oil-making unit; The first oil production unit includes a first oil tank (1), a first stirring pump (4) and a first vacuum pump (5), and the second oil production unit includes a second oil tank (2); The first oil tank (1) is connected in series to the second oil tank (2) via a first solenoid valve (3); the first stirring pump (4) and the first vacuum pump (5) are respectively connected in parallel to the first oil tank (1); the first oil tank (1) is provided with a first oil inlet and a first oil outlet; the second oil tank (2) has the same structure as the first oil tank (1); The first solenoid valve (3) is opened, and the first oil production unit and the second oil production unit both prepare blank oil; The first solenoid valve (3) is closed, the first oil-making unit or the second oil-making unit prepares blank oil, and the other oil-making unit is used to recycle waste oil, and subsequently prepare blank oil from the waste oil.

2. The blank oil preparation device for transformer insulating oil according to claim 1, characterized in that: The first oil-making unit further comprises a first pressure plate (6), a No. 1 three-way valve (7), a second solenoid valve (8), a No. 2 three-way valve (9), a No. 3 three-way valve (10) and a third solenoid valve (11); One end of the first vacuum pump (5) is connected to the air path of the first oil tank (1), and the other end is connected to the first pressure plate (6). The first pressure plate (6) is connected to the first oil tank (1) through the No. 1 three-way valve (7); one end of the second solenoid valve (8) is connected to the No. 1 three-way valve (7), and the other end is connected to the No. 2 three-way valve (9); one end of the first stirring pump (4) is connected to the No. 2 three-way valve (9), and the other end is connected to the No. 3 three-way valve (10); one end of the third solenoid valve (11) is connected to the No. 3 three-way valve (10), and the other end is connected to the first oil tank (1); one end of the first solenoid valve (3) is connected to the No. 3 three-way valve (10).

3. The blank oil preparation device for transformer insulating oil according to claim 2, characterized in that: The first oil-making unit further comprises a fourth solenoid valve (12), one end of which is connected to the No. 2 three-way valve (9), and the other end of which is detachably connected to the external oil chamber.

4. The blank oil preparation device for transformer insulating oil according to claim 2, characterized in that: The oil inlet of the first oil tank (1) is provided with a first oil inlet valve (13), and the oil outlet of the first oil tank (1) is provided with a fifth solenoid valve (14).

5. The blank oil preparation device for transformer insulating oil according to claim 4, characterized in that: The blank oil preparation process of the first oil production unit and the second oil production unit is the same, and the blank oil preparation process of the first oil production unit is: Closing the fifth solenoid valve (14), the sixth solenoid valve (16), the fourth solenoid valve (12) and the first solenoid valve (3) to seal the first oil tank (1) from the inside and outside; opening the second solenoid valve (8) and the third solenoid valve (11); The first stirring pump (4) is started to stir the oil to form an oil mist with a sufficiently small particle size, and molecular sieve degassing is performed; the first vacuum pump (5) is started to extract the gas from the first oil tank (1), and the target pressure in the first oil tank (1) is set; when the pressure in the first oil tank (1) reaches the target pressure, the oil in the first oil tank (1) is degassed and dehydrated, and the preparation of blank oil is completed.

6. The blank oil preparation device for transformer insulating oil according to claim 4, characterized in that: The oil inlet of the second oil tank (2) is provided with a second oil inlet valve (15), the oil outlet of the second oil tank (2) is provided with a sixth solenoid valve (16), and the outlet ends of the sixth solenoid valve (16) and the fifth solenoid valve (14) are connected via a No. 4 three-way valve (17).

7. The blank oil preparation device for transformer insulating oil according to claim 6, characterized in that: The second oil production unit includes a second vacuum pump (18), a second pressure plate (19), a No. 5 three-way valve (20), a seventh solenoid valve (21), a No. 6 three-way valve (22), a second stirring pump (23), a No. 7 three-way valve (24) and an eighth solenoid valve (25); One end of the second vacuum pump (18) is connected to the second oil tank (2), and the other end is connected to the second pressure plate (19); one end of the No. 5 three-way valve (20) is connected to the second pressure plate (19), and the other end is connected to the second oil tank (2); One end of the seventh solenoid valve (21) is connected to the No. 5 three-way valve (20), and the other end is connected to the No. 6 three-way valve (22); the two ends of the second stirring pump (23) are respectively connected to the No. 6 three-way valve (22) and the No. 7 three-way valve (24); one end of the eighth solenoid valve (25) is connected to the No. 7 three-way valve (24), and the other end is connected to the second oil tank (2); the first solenoid valve (3) is connected to the second oil tank (2) through the No. 6 three-way valve (22).

8. The blank oil preparation device for transformer insulating oil according to claim 7, characterized in that: The second oil control unit further comprises a ninth solenoid valve (26), one end of which is connected to the No. 6 three-way valve (22), and the other end of which is detachably connected to the external oil chamber.

9. The blank oil preparation device for transformer insulating oil according to claim 7, characterized in that: The first oil production unit and the second oil production unit have the same process for waste oil recovery. The specific process of waste oil recovery by the second oil production unit is as follows: Close the sixth solenoid valve (16), the first solenoid valve (3) and the ninth solenoid valve (26), open the second oil inlet valve (15), and connect the oil inlet of the second oil tank (2) to the waste oil pipe; Recover the waste oil into the second oil tank (2) until all the waste oil has been collected, and then close the second oil inlet valve (15); The blank oil preparation process of the second oil preparation unit is started to convert the waste oil in the second oil tank (2) into blank oil that meets the requirements, thereby completing the recovery and reuse of the waste oil.

10. A method for preparing a blank oil preparation device for transformer insulating oil according to any one of claims 1 to 9, characterized in that: The following steps are involved: Confirm the actual amount of blank oil required for transformer insulating oil and compare the actual amount with the threshold oil amount; If the actual amount of oil used is greater than the threshold amount of oil, the first solenoid valve (3) is opened, and the first oil production unit and the second oil production unit jointly prepare blank oil; otherwise, the first solenoid valve (3) is closed, and the first oil production unit or the second oil production unit prepares blank oil; Confirm whether waste oil recovery is required. If waste oil recovery is required, close the first solenoid valve (3), and use the first oil-making unit and the second oil-making unit for waste oil recovery; close the oil outlet of the oil-making unit, connect the oil inlet to the waste oil pipe, and after the collection is completed, close the oil inlet, start the blank oil preparation process, and convert the waste oil into blank oil that meets the requirements.

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