Insulating oil filtration system and filtration method

Abstract

The present invention discloses an insulating oil filtering system and filtering method, which are used to solve the problem that the existing insulating oil filtering system is operated manually and has a low degree of automation. The insulating oil filtering system includes an oil filter, N first oil tank assemblies, a second oil tank assembly and a control device. The first oil tank in each first oil tank assembly is connected to the first oil inlet and the first oil outlet of the oil filter through a first valve and a second valve respectively; the second oil tank in the second oil tank assembly is connected to the first oil inlet and the first oil outlet of the oil filter through a third valve and a fourth valve respectively; the first liquid level detection instrument and the second liquid level detection instrument are respectively installed on the first oil tank and the second oil tank; the control device is used to control the opening and closing of the corresponding valve according to the detection result of the liquid level detection instrument to filter the insulating oil in the first oil tank. The insulating oil filtering system provided by the present invention does not require manual operation when filtering the insulating oil, thereby improving the oil filtering efficiency.

Description

Technical Field

[0001] The invention relates to the field of transformer insulating oil treatment, and in particular to an insulating oil filtering system and a filtering method. Background Art

[0002] Transformer oil plays a major role in insulation in the transformer, so it is also called insulating oil. Before injecting the insulating oil into the transformer, the original insulating oil needs to be filtered so that the insulating oil meets the use requirements of the transformer.

[0003] In the related art, when filtering the insulating oil, the opening and closing of the oil filter, the opening and closing of each valve on the oil tank, the switching of pipelines, etc. all need to be manually operated by on-site staff. The on-site staff have a large workload, the oil filter is frequently switched on and off, and the oil filtering efficiency is low, which greatly reduces the installation efficiency of the main equipment. Summary of the invention

[0004] The object of the present invention is to provide an insulating oil filtering system and a filtering method, which are used to solve the problem that the insulating oil filtering system in the related art is operated manually and has a low degree of automation.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] In a first aspect, some embodiments of the present invention provide an insulating oil filtration system, comprising: an oil filter, N first oil tank assemblies, a second oil tank assembly, and a control device. The oil filter comprises a first oil inlet and a first oil outlet. Each first oil tank assembly comprises a first oil tank, a first liquid level detection instrument, a first valve, and a second valve; the first oil tank is connected to the first oil inlet of the oil filter through the first valve, and the first oil tank is connected to the first oil outlet of the oil filter through the second valve; the first liquid level detection instrument is installed on the first oil tank, and is used to detect the liquid level height in the first oil tank; N≥1, N is an integer. The second oil tank assembly comprises a second oil tank, a second liquid level detection instrument, a third valve, and a fourth valve; the second oil tank is connected to the first oil inlet of the oil filter through the third valve, and the second oil tank is connected to the first oil outlet of the oil filter through the fourth valve; the second liquid level detection instrument is installed on the second oil tank, and is used to detect the liquid level height in the second oil tank. The control device is electrically connected to the oil filter, the first liquid level detection instrument, the first valve, the second valve, the second liquid level detection instrument, the third valve, and the fourth valve. For any first oil tank assembly and second oil tank assembly: if the detection result of the first liquid level detection instrument is greater than the first height threshold L1, and the detection result of the second liquid level detector is less than the second height threshold L2, the control device is used to control the first valve and the fourth valve to open, and control the second valve and the third valve to close; if the detection result of the second liquid level detection instrument is equal to the second height threshold L2, and the detection result of the first liquid level detection instrument is less than the second height threshold L2, then the third valve and the second valve are controlled to open, and the first valve and the fourth valve are controlled to close; wherein, L2>L1.

[0007] In some embodiments, the insulating oil filtration system further includes: an oil inlet main line and an oil outlet main line. The oil inlet main line has a first port and a plurality of first openings; the first port is detachably connected to the first oil inlet of the oil filter, a first oil tank is connected to the first opening through a first valve, and a second oil tank is connected to the first opening through a third valve. The oil outlet main line has a second port and a plurality of second openings; the second port is connected to the first oil outlet of the oil filter, a first oil tank is connected to the second opening through a second valve, and a second oil tank is connected to the second opening through a fourth valve.

[0008] In some embodiments, the insulating oil filtration system further includes: an insulating oil detection device, including a second oil inlet and a second oil outlet, the second oil inlet is connected to the first oil outlet, and the second oil outlet is connected to the second oil tank and the N first oil tanks. The control device is electrically connected to the insulating oil detection device, and the control device is also used to: receive detection data of the insulating oil detection device, and obtain at least one of the flow rate, water content, gas content and particle content of the insulating oil flowing through the insulating oil detection device according to the detection data; if the water content, gas content and particle content are less than the set value, then when the detection result of the first liquid level detection instrument is equal to the second height threshold L2, the first valve, the second valve, the third valve and the fourth valve are controlled to be closed.

[0009] In some embodiments, the insulating oil detection device includes a first pipeline, a detection tank, a vacuum pump and a vacuum gauge. The first pipeline has a second oil inlet and a second oil outlet. The detection tank includes a third oil inlet and a third oil outlet, the third oil inlet is connected to the second oil inlet, and the third oil outlet is connected to the second oil outlet. The vacuum pump is connected to the detection tank. The detection end of the vacuum gauge is located in the detection tank, and the vacuum gauge is used to detect the pressure in the detection tank. Among them, the vacuum pump and the vacuum gauge are electrically connected to the control device; the detection data includes the pressure in the detection tank; the control device is also used to control the opening and closing of the vacuum pump, and receive the pressure in the detection tank, and obtain the gas content of the insulating oil according to the pressure in the detection tank.

[0010] In some embodiments, the insulating oil detection device further includes a micro-water detector. The micro-water detector includes a fourth oil inlet and a fourth oil outlet, the fourth oil inlet is connected to the second oil inlet, and the fourth oil outlet is connected to the second oil outlet; the micro-water detector is used to detect the water content in the insulating oil, and the micro-water detector is electrically connected to the control device. The detection data also includes the water content of the insulating oil.

[0011] In some embodiments, the insulating oil detection device further includes a particle size detector, and / or a flow meter. The particle size detector includes a fifth oil inlet and a fifth oil outlet, the fifth oil inlet is connected to the second oil inlet, and the fifth oil outlet is connected to the second oil outlet; the particle size detector is used to detect the particle content in the insulating oil, and the particle size detector is electrically connected to the control device. The flow meter is located at the second oil inlet or the second oil outlet; the flow meter is used to detect the flow of the insulating oil flowing through the first pipeline, and the flow meter is electrically connected to the control device. Wherein, the detection data also includes the particle content of the insulating oil, and / or the flow of the insulating oil.

[0012] In some embodiments, the first oil tank assembly further includes: a first float switch and a second float switch. The first float switch is installed at the bottom end of the first oil tank, and is used to transmit a signal when the liquid level in the first oil tank reaches a third height threshold L3; the second float switch is installed at the top end of the first oil tank, and is used to transmit a signal when the liquid level in the first oil tank reaches a fourth height threshold L4. The second oil tank assembly further includes: a third float switch and a fourth float switch. The third float switch is installed at the bottom end of the second oil tank, and is used to transmit a signal when the liquid level in the second oil tank reaches a third height threshold L3; the fourth float switch is installed at the top end of the second oil tank, and is used to transmit a signal when the liquid level in the second oil tank reaches a fourth height threshold L4. Among them, L3≤L1, L4≥L2; the control device is electrically connected to the first float switch, the second float switch, the third float switch and the fourth float switch; the control device is also used to: control the first valve to close when receiving a signal from the first float switch; control the second valve to close when receiving a signal from the second float switch; control the third valve to close when receiving a signal from the third float switch; control the fourth valve to close when receiving a signal from the fourth float switch; and control the oil filter to close when receiving a signal from any one of the first float switch, the second float switch, the third float switch and the fourth float switch.

[0013] In some embodiments, the first oil tank further comprises a first breathing port, and the first breathing port is located at the top of the first oil tank. The first oil tank assembly further comprises a first breathing valve and a first desiccant, and the first desiccant is connected between the first breathing valve and the first breathing port. The second oil tank further comprises a second breathing port, and the second breathing port is located at the top of the second oil tank. The second oil tank assembly further comprises a second breathing valve and a second desiccant, and the second desiccant is connected between the second breathing valve and the second breathing port.

[0014] In some embodiments, the first oil tank further has a first pressure relief port, which is located at the top of the first oil tank. The first oil tank assembly further includes: a first safety valve, which is installed at the first pressure relief port of the first oil tank. The second oil tank further has a second pressure relief port, which is located at the top of the second oil tank. The second oil tank assembly further includes: a second safety valve, which is installed at the second pressure relief port of the second oil tank.

[0015] In some embodiments, the first oil tank further has a first sampling port, and the first sampling port is located at the bottom of the first oil tank. The first oil tank assembly further includes: a fifth valve, installed at the first sampling port; the fifth valve is used to open and close the first sampling port. The second oil tank further has a second sampling port, and the second sampling port is located at the bottom of the second oil tank. The second oil tank assembly further includes: a sixth valve, installed at the second sampling port; the sixth valve is used to open and close the second sampling port.

[0016] In a second aspect, some embodiments of the present invention further provide an insulating oil filtering method, which is applied to the insulating oil filtering system described in any of the above embodiments, and the insulating oil filtering method includes: performing at least one oil filtering cycle process. The oil filtering cycle process includes: for any first oil tank assembly and second oil tank assembly: if the detection result of the first liquid level detection instrument is greater than the first height threshold L1, and the detection result of the second liquid level detection instrument is less than the second height threshold L2, then the first valve and the fourth valve are controlled to be opened, and the second valve and the third valve are controlled to be closed; and if the detection result of the second liquid level detection instrument is equal to the second height threshold L2, and the detection result of the first liquid level detection instrument is less than the second height threshold L2, then the third valve and the second valve are controlled to be opened, and the first valve and the fourth valve are controlled to be closed; wherein, L2>L1.

[0017] In some embodiments, before performing at least one oil filtration cycle process, the insulating oil filtration method also includes: obtaining the oil filtration order of N first oil tank assemblies, and performing at least one oil filtration cycle process on the N first oil tank assemblies in sequence according to the oil filtration order; N≥2.

[0018] In some embodiments, when the oil filtering system includes an insulating oil detection device, the insulating oil filtering method also includes: receiving detection data from the insulating oil detection device, and obtaining at least one of the flow rate, water content, gas content and particle content of the insulating oil based on the detection data; and if it is determined that the water content, gas content and particle content are less than the set value, after executing the current oil filtering cycle process, at least one oil filtering cycle process is performed on the next first oil tank assembly according to the oil filtering order.

[0019] In some embodiments, before obtaining the oil filtering order of the N first oil tank assemblies, the insulating oil filtering method further includes: obtaining the oil filling order of the N first oil tank assemblies; and performing the oil filling process on the N first oil tank assemblies in sequence according to the oil filling order. The oil filling process includes: if the detection result of the first liquid level detection instrument in a first oil tank assembly is less than or equal to the first height threshold L1, then controlling the second valve to open and controlling the first valve to close; and if the detection result of the first liquid level detection instrument is equal to the second height threshold L2, then controlling the second valve to close.

[0020] The insulating oil filtering system and insulating oil filtering method provided by the present invention have the following beneficial effects:

[0021] In summary, in the insulating oil filtering system provided by the present invention, the control device can control the opening and closing of the first valve, the second valve, the third valve and the fourth valve according to the liquid level height in the first oil tank detected by the first liquid level detection instrument and the liquid level height in the second oil tank detected by the second liquid level detection instrument, so as to realize the circulating tank filtering of the insulating oil in any first oil tank assembly through the oil filter machine and the second oil tank assembly. During the circulating tank filtering process, the opening and closing of the oil filter machine, the opening and closing of each valve on the oil tank, and the switching of the pipelines do not require manual operation, thereby improving the efficiency of the oil filtering work and thereby improving the installation efficiency of the main equipment.

[0022] In addition, when the number of first oil tank assemblies is greater than or equal to 2 (N≥2), the oil filtering order can be set in the control device, and the insulating oil in the N first oil tank assemblies can be circulated and filtered in turn according to the oil filtering order. That is, after the insulating oil quality in the current first oil tank assembly is qualified, after the current oil filtering cycle of the current first oil tank assembly is completed, the insulating oil in the next first oil tank assembly can be circulated and filtered. In this way, the insulating oil in all the first oil tank assemblies can be continuously filtered without frequently starting and stopping the oil filter machine, thereby improving the automation and work efficiency of the system, and thereby improving the installation efficiency of the transformer main equipment.

[0023] The beneficial technical effects of the insulating oil filtering method provided by the present invention are the same as the beneficial technical effects of the insulating oil filtering system provided by the embodiment of the present invention, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 A connection diagram of an insulating oil filtering system according to some embodiments of the present invention;

[0026] Figure 2 is a structural schematic diagram of a second oil tank assembly according to some embodiments of the present invention;

[0027] Figure 3 is a structural schematic diagram of a first oil tank assembly according to some embodiments of the present invention;

[0028] Figure 4 is a schematic diagram of an insulating oil detection device according to some embodiments of the present invention;

[0029] Figure 5 is a flow chart of an insulating oil filtering method according to some embodiments of the present invention;

[0030] Figure 6 is a flow chart of an insulating oil filtering method according to some embodiments of the present invention;

[0031] Figure 7 is a flow chart of an insulating oil filtering method according to some other embodiments of the present invention;

[0032] Figure 8 is a flow chart of an insulating oil filtering method according to some embodiments of the present invention;

[0033] Fig. 9 is a flow chart of an insulating oil filtering method according to some embodiments of the present invention;

[0034] Fig.10 The figure is a flow chart of an insulating oil filtering method according to some embodiments of the present invention.

[0035] Figure numerals: 100-insulating oil filtration system; 1-oil filter; 11-first oil inlet; 12-first oil outlet; 2-second oil tank assembly; 21-second oil tank; 211-second breathing port; 212-second pressure relief port; 213-second sampling port; 22-second liquid level detection instrument; 23-third valve; 24-fourth valve; 25-third float switch; 26-fourth float switch; 27-second breathing valve; 28-second desiccant; 29-second safety valve; 20-sixth valve; 3-first oil tank assembly; 31-first oil tank; 311-first breathing port; 312-first pressure relief port; 313-first sampling port; 32-first liquid level detection instrument; 33-first valve; 34-second valve; 35-first float switch; 36-first Two float switches; 37-first breathing valve; 38-first desiccant; 39-first safety valve; 30-fifth valve; 4-control device; 5-oil inlet main line; 51-first port; 52-first opening; 6-oil outlet main line; 61-second port; 62-second opening; 7-insulating oil detection device; 70-housing; 71-first pipeline; 711-second oil inlet; 712-second oil outlet; 72-detection tank; 721-third oil inlet; 722-third oil outlet; 73-vacuum pump; 74-vacuum gauge; 75-micro-water detector; 751-fourth oil inlet; 752-fourth oil outlet; 76-particle size detector; 761-fifth oil inlet; 762-fifth oil outlet; 77-flow meter; 78-buffer tank; 79-oil pump. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0038] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0039] In the description of the present invention, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] In the embodiments of the present application, the terms "include", "comprises" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0041] In the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.

[0042] See also Figure 1 Some embodiments of the present invention provide an insulating oil filtering system 100, including an oil filter 1, a second oil tank assembly 2, N first oil tank assemblies 3, and a control device 4 (such as Figure 4 shown).

[0043] The oil filter 1 includes a first oil inlet 11 and a first oil outlet 12. The insulating oil to be filtered flows into the interior of the oil filter 1 from the first oil inlet 11, and is filtered to remove impurities, moisture and gas inside the oil filter 1, and the insulating oil after filtering flows out from the first oil outlet 12. Exemplarily, the oil filter 1 can be a vacuum oil filter, which has the characteristics of small size, light weight, easy to move, low noise, long continuous working time, stable performance, and easy operation, so as to improve the filtering effect of the insulating oil.

[0044] See also Figure 3 In order to store insulating oil and control the flow direction of insulating oil according to the oil level, each of the N first oil tank assemblies 3 includes a first oil tank 31, a first liquid level detection instrument 32, a first valve 33 and a second valve 34. The first oil tank 31 is connected to the first oil inlet 11 of the oil filter 1 through the first valve 33, and the first oil tank 31 is connected to the first oil outlet 12 of the oil filter 1 through the second valve 34. The first liquid level detection instrument 32 is installed on the first oil tank 31 and is used to detect the liquid level in the first oil tank 31. Wherein, N≥1, N is an integer.

[0045] Exemplarily, the first oil tank 31 may be a horizontal cylindrical oil tank, which is mounted and fixed to the ground by a bracket. In this way, the height of the first oil tank 31 can be lowered while maintaining the same volume.

[0046] Exemplarily, the first liquid level detection instrument 32 may be a magnetic flap liquid level gauge, which may be installed on the end plate of the first oil tank 31 .

[0047] Exemplarily, the first oil tank 31 can be connected to the first oil inlet 11 and the first oil outlet 12 of the oil filter 1 through pipelines, respectively, and the first valve 33 and the second valve 34 can be installed at the corresponding openings on the first oil tank 31; or, the first valve 33 and the second valve 34 can also be installed on the corresponding pipelines.

[0048] See also Figure 2In order to store the insulating oil and control the flow direction of the insulating oil according to the oil level, the second oil tank assembly 2 includes a second oil tank 21, a second liquid level detection instrument 22, a third valve 23 and a fourth valve 24. The second oil tank 21 is connected to the first oil inlet 11 of the oil filter 1 through the third valve 23, and the second oil tank 21 is connected to the first oil outlet 12 of the oil filter 1 through the fourth valve 24. The second liquid level detection instrument 22 is installed on the second oil tank 21 and is used to detect the liquid level in the second oil tank 21.

[0049] Exemplarily, the number of the second oil tank assembly 2 can be one, which is used to empty and filter the insulating oil in the first oil tank assembly 3; or, the number of the second oil tank assembly 2 can be two or more, which can be used as backup oil tanks to ensure the continuous operation of the insulating oil filtration system 100 and improve operating efficiency.

[0050] Exemplarily, the second oil tank 21 may be a horizontal cylindrical oil tank, which is mounted and fixed to the ground by a bracket. In this way, the height of the second oil tank 21 can be lowered while maintaining the same volume.

[0051] Exemplarily, the second liquid level detection instrument 22 may be a magnetic flap liquid level gauge, which may be installed on the end plate of the second oil tank 21 .

[0052] Exemplarily, the second oil tank 21 can be connected to the first oil inlet 11 and the first oil outlet 12 of the oil filter 1 through pipelines, respectively, and the third valve 23 and the fourth valve 24 can be installed at the corresponding openings on the second oil tank 21; or, the third valve 23 and the fourth valve 24 can also be installed on the corresponding pipelines.

[0053] For example, Figure 2 and Figure 3 As shown, the structural composition of the first oil tank assembly 3 and the second oil tank assembly 2 can be completely the same, which is convenient for the design, installation and automated operation of the equipment in the system.

[0054] Exemplarily, the total volume of all the first oil tanks 31 and the second oil tanks 21 can be greater than or equal to 120% of the volume of the transformer, so that the system can continuously filter the insulating oil, and filter all the insulating oil required by the transformer, so as to improve the installation efficiency of the main equipment. For example, the volume of the transformer is 150T, the total number of the first oil tank assembly 3 and the second oil tank assembly 2 in the insulating oil filtering system can be 12, and the volume of the first oil tank 31 and the second oil tank 21 is 15T.

[0055] In order to realize the automatic operation of the insulating oil filtering system 100, the control device 4 is electrically connected to the oil filter 1, the first liquid level detection instrument 32, the first valve 33, the second valve 34, the second liquid level detection instrument 22, the third valve 23 and the fourth valve 24. For any first oil tank assembly 3 and second oil tank assembly 2, an oil filtering cycle process of filtering oil by pouring the tank through the oil filter 1 includes: in a first oil tank assembly 3, if the detection result of the first liquid level detection instrument 32 is greater than the first height threshold L1, and the detection result of the second liquid level detector 22 is less than the second height threshold L2, then the control device 4 is used to control the first valve 33 and the fourth valve 24 to open, and control the second valve 34 and the third valve 23 to close; if the detection result of the second liquid level detection instrument 22 is equal to the second height threshold L2, and the detection result of the first liquid level detection instrument 32 is less than the second height threshold L2, then the third valve 23 and the second valve 34 are controlled to open, and the first valve 33 and the fourth valve 24 are controlled to close; wherein, L2>L1. Based on this, the control device 4 can control the insulating oil filtering system 100 to continuously perform at least one oil filtering cycle process on the insulating oil in each first oil tank assembly 3 until the insulating oil meets the use requirements.

[0056] Exemplarily, the initial liquid level height of the insulating oil in each first oil tank 31 may be the second height threshold L2, and the initial liquid level height of the insulating oil in the second oil tank 21 may be less than or equal to the first height threshold L1. L1 and L2 are height thresholds set according to the structure and size of the first oil tank 31 and the second oil tank 21. For example, the first oil tank 31 and the second oil tank 21 are horizontal cylindrical oil tanks with a diameter of 2.6 m, and the value of L1 may be 100 mm to 150 mm (such as the value of L1 may be 100 mm, 125 mm, or 150 mm), and the value of L2 may be 2450 mm to 2500 mm (such as the value of L2 may be 2450 mm, 2475 mm, or 2500 mm).

[0057] In summary, in the insulating oil filtering system 100 provided by the present invention, the control device 4 can control the opening and closing of the first valve 33, the second valve 34, the third valve 23 and the fourth valve 24 according to the liquid level height in the first oil tank 31 detected by the first liquid level detection instrument 32 and the liquid level height in the second oil tank 21 detected by the second liquid level detection instrument 22, so as to realize the circulating tank filtering of the insulating oil in any first oil tank assembly 3 through the oil filter 1 and the second oil tank assembly 2. During the circulating tank filtering process, the opening and closing of the oil filter 1, the opening and closing of each valve on the oil tank, and the switching of the pipeline do not require manual operation, thereby improving the oil filtering work efficiency and thereby improving the installation efficiency of the main equipment.

[0058] In addition, when the number of first oil tank assemblies 3 is greater than or equal to 2 (N≥2), the oil filtering order can be set in the control device 4, and the insulating oil in the N first oil tank assemblies 3 can be circulated and filtered in turn according to the oil filtering order. That is, after the insulating oil in the current first oil tank assembly 3 meets the use requirements, after the current oil filtering cycle of the current first oil tank assembly 3 is completed, the insulating oil in the next first oil tank assembly 3 is continued to be circulated and filtered. In this way, there is no need to frequently start and stop the oil filter machine 1, and the insulating oil in all the first oil tank assemblies 3 can be continuously filtered, thereby improving the automation and work efficiency of the system, and thereby improving the installation efficiency of the main equipment of the transformer.

[0059] See also Figure 1 In some embodiments, the insulating oil filtering system 100 further includes an oil inlet main line 5 and an oil outlet main line 6. The oil inlet main line 5 has a first port 51 and a plurality of first openings 52. The first port 51 is detachably connected to the first oil inlet 11 of the oil filter 1, a first oil tank 31 is connected to the first opening 52 through a first valve 33, and a second oil tank 21 is connected to the first opening 52 through a third valve 23. The oil outlet main line 6 has a second port 61 and a plurality of second openings 62. The second port 61 is connected to the first oil outlet 12 of the oil filter 1, a first oil tank 31 is connected to the second opening 62 through a second valve 34, and a second oil tank 21 is connected to the second opening 62 through a fourth valve 24.

[0060] With such a design, the second oil tank 21 and the plurality of first oil tanks 31 can be placed together, and the pipeline connection between the second oil tank 21, the first oil tank 31 and the oil filter 1 is simplified. In addition, the first port 51 is detachably connected to the first oil inlet 11 of the oil filter 1. When filtering the insulating oil in each first oil tank assembly 3, the first port 51 can be connected to the first oil inlet 11; when injecting the insulating oil to be filtered into each first oil tank assembly 3, the connection between the first port 51 and the first oil inlet 11 can be disconnected, and the first oil inlet 11 can be connected to the outlet of the insulating oil transportation device (such as a tanker), so that the insulating oil to be filtered can be injected into the first oil tank 31 in each first oil tank assembly 3 in turn through the oil filter 1. Therefore, continuous oil unloading can be achieved without frequently switching the connection between the outlet of the insulating oil transportation device and different first oil tanks 31, thereby improving the efficiency of unloading oil into the first oil tank 31, thereby improving the installation efficiency of the transformer main equipment.

[0061] For example, Figure 1 As shown, a first oil tank 31 can be connected to the first opening 52 and the second opening 62 through a flexible hose, so that the pipeline connection is convenient.

[0062] For example, a second oil tank 21 may be connected to the first opening 52 and the second opening 62 through flexible hoses, respectively, so as to facilitate pipeline connection.

[0063] Exemplarily, the main oil inlet line 5 may include a hard pipe and a flexible hose connected to each other. The hard pipe is mounted in the oil tank group through a bracket, and the first opening 52 is located on the hard pipe; the flexible hose is connected between the hard pipe and the oil filter 1, so that the pipeline connection is convenient.

[0064] Exemplarily, the main oil outlet line 6 may include a hard pipe and a flexible hose connected to each other. The hard pipe is mounted in the oil tank group through a bracket, and the second opening 62 is located on the hard pipe; the flexible hose is connected between the hard pipe and the oil filter 1, so that the pipeline connection is convenient.

[0065] Exemplarily, a valve is provided at the first opening 52 for opening and closing the first opening 52 to ensure the normal operation of the system when the first valve 33 and the third valve 23 fail.

[0066] Exemplarily, a valve is provided at the second opening 62 for opening and closing the second opening 62 to ensure the normal operation of the system when the second valve 34 and the fourth valve 24 fail.

[0067] See also Figure 1 In some embodiments, the insulating oil filtration system 100 further includes an insulating oil detection device 7. The insulating oil detection device 7 includes a second oil inlet 711 and a second oil outlet 712. The second oil inlet 711 is connected to the first oil outlet 12, and the second oil outlet 712 is connected to the second oil tank 21 and the N first oil tanks 31. The control device 4 is electrically connected to the insulating oil detection device 7. For any first oil tank assembly 3 and the second oil tank assembly 2, the control device 4 is also used to: receive the detection data of the insulating oil detection device 7, and obtain at least one of the flow rate, water content, gas content and particle content of the insulating oil flowing through the insulating oil detection device 7 according to the detection data; if the water content, gas content and particle content are less than the set value, then when the detection result of the first liquid level detection instrument 32 is equal to the second height threshold L2, the first valve 33, the second valve 34, the third valve 23 and the fourth valve 24 are controlled to be closed.

[0068] It should be noted that when the number of first oil tank assemblies 3 is greater than or equal to 2 (N≥2), according to the oil filtering order, for the last first oil tank assembly 3 and the second oil tank assembly 2, if the water content, gas content and particle content are less than the set value, then when the detection result of the first liquid level detection instrument 32 is equal to the second height threshold L2, the control device 4 controls the first valve 33, the second valve 34, the third valve 23 and the fourth valve 24 to close, and at the same time, controls the oil filter 1 to shut down, so that the insulating oil filtration system 100 stops working.

[0069] With such a design, the insulating oil filtered by the oil filter 1 can be tested in real time. The control device 4 obtains the relevant parameters of the insulating oil based on the test data and records and stores them in real time. There is no need to perform manual sampling and testing after the oil filtering is completed and wait for the test results of the insulating oil. This prevents the problem of repeated re-sampling and testing due to sample contamination caused by improper sampling, thereby improving the installation efficiency of the main equipment of the transformer.

[0070] See also Figure 4 In some embodiments, the insulating oil detection device 7 includes a first pipeline 71, a detection tank 72, a vacuum pump 73 and a vacuum gauge 74. The first pipeline 71 has the second oil inlet 711 and the second oil outlet 712. The detection tank 72 includes a third oil inlet 721 and a third oil outlet 722, the third oil inlet 721 is connected to the second oil inlet 711, and the third oil outlet 722 is connected to the second oil outlet 712. The vacuum pump 73 is connected to the detection tank 72. The detection end of the vacuum gauge 74 is located in the detection tank 72, and the vacuum gauge 72 is used to detect the pressure in the detection tank 72. Among them, the vacuum pump 73 and the vacuum gauge 74 are electrically connected to the control device 4. The detection data includes the pressure in the detection tank; the control device 4 is also used to control the opening and closing of the vacuum pump 73, and receive the pressure in the detection tank 72, and obtain the gas content of the insulating oil according to the pressure in the detection tank 72.

[0071] With such a design, when the insulating oil detection device 7 is used to detect the gas concentration in the insulating oil, first, the third oil inlet 721 of the detection tank 72 is blocked, and the gas inside the detection tank 72 is extracted through the vacuum pump 73 connected to the detection tank 72, so that the inside of the detection tank 72 is in a negative pressure state, or even close to a vacuum state, and the first pressure p1 in the detection tank 72 at this time is obtained through the vacuum gauge 74. Subsequently, insulating oil with a volume of V1 is transported into the detection tank 72 through the third oil inlet 721. Since the detection tank 72 is in a negative pressure state, it is convenient for the insulating oil to enter the detection tank 72 through the third oil inlet 721, and it is also beneficial for the separation of the gas dissolved in the insulating oil from the insulating oil. The second pressure p2 in the detection tank 72 at this time is obtained through the vacuum gauge 74.

[0072] Based on the above two pressures (negative pressures) p1 and p2, since the volume of the insulating oil transported in the detection tank 72 is V1 and the volume of the detection tank 72 is V2, both are known quantities, the control device 4 is based on the formula:

[0073]

[0074] The volume concentration of gas dissolved in insulating oil can be directly calculated. R is the molar gas constant and Vm is the molar volume of gas, both of which are known constants. T1 is the ambient temperature, which can be directly obtained or measured. The value is the Celsius temperature plus 273.15.

[0075] In summary, the pressure (negative pressure) before and after the insulating oil is injected into the detection tank 72 can be measured by simply using the vacuum pump 73 and the vacuum gauge 74. The volume concentration of the gas dissolved in the insulating oil can be calculated based on the above formula, known constants and ambient temperature. This detection method does not require the use of carrier gas and other consumables, is conducive to the continuous use of the insulating oil detection device 7, and has a lower detection and use cost.

[0076] It should be noted that when detecting the pressure (negative pressure) when insulating oil is contained in the detection tank 72, it is necessary to leave it to stand for a period of time after the insulating oil is transported into the detection tank 72. This allows the gas dissolved in the insulating oil to separate from the insulating oil in the negative pressure environment, and the temperature in the detection tank 72 is kept consistent with the ambient temperature after being left to stand for a period of time, both being T1, so as to improve the detection accuracy.

[0077] Exemplarily, the second oil inlet 711 and the second oil outlet 712 are located at two ends of the first pipeline 71. Exemplarily, the first pipeline 71 is connected in series to the main oil outlet pipeline 6 near the first oil outlet 12 of the oil filter 1.

[0078] Exemplarily, the insulating oil detection device 7 also includes a shell 70 , and a first pipeline 71 , a detection tank 72 , a vacuum pump 73 and a vacuum gauge 74 are located in the shell 70 , so as to facilitate the connection of the insulating oil detection device 7 with other pipelines in the insulating oil filtration system 100 .

[0079] Exemplarily, the third oil inlet 721 is connected to the second oil inlet 711 via a pipeline, and a valve for controlling the on-off of the pipeline is provided on the connecting pipeline.

[0080] Exemplarily, the insulating oil detection device 7 further includes a buffer tank 78, which is connected between the second oil outlet 712 and the third oil outlet 722 through a pipeline, and a valve for controlling the on-off of the pipeline is provided on the pipeline between the buffer tank 78 and the detection tank 72; the vacuum pump 73 is connected to the air outlet of the buffer tank 78, and further connected to the detection tank 72. In this way, it can be prevented that the insulating oil enters the vacuum pump 73 when the detection tank 72 is evacuated.

[0081] Exemplarily, the insulating oil detection device 7 further includes an oil pump 79, which is connected between the buffer tank 78 and the second oil outlet 712 through a pipeline, and the oil pump 79 is electrically connected to the control device 4; a one-way valve is provided on the pipeline between the oil pump 79 and the second oil outlet 712. In this way, the insulating oil in the detection tank 72 and the buffer tank 78 can be guided back to the first pipeline 71 through the oil pump 79, and the insulating oil can be prevented from flowing back to the detection tank 72.

[0082] Exemplarily, the vacuum gauge 74 may be a thin film capacitance gauge; or, the vacuum gauge 74 may be a Pirani resistance gauge, both of which may be used to measure pressure (negative pressure).

[0083] See also Figure 4 In some embodiments, the insulating oil detection device 7 further includes a micro-water detector 75, and the micro-water detector 75 includes a fourth oil inlet 751 and a fourth oil outlet 752, wherein the fourth oil inlet 751 is connected to the second oil inlet 711, and the fourth oil outlet 752 is connected to the second oil outlet 712. The micro-water detector 75 is used to detect the water content in the insulating oil, and the micro-water detector 75 is electrically connected to the control device 4. The detection data also includes the water content of the insulating oil. In this way, the water content of the insulating oil flowing through the first pipeline 71 can be detected in real time, and then the water content of the insulating oil after filtering by the oil filter 2 can be detected in real time, thereby improving the detection accuracy and detection efficiency.

[0084] It should be noted that, in other embodiments, the insulating oil detection device 7 may further include a thermometer (not shown in the figure), the detection end of the thermometer is located in the detection tank 75, and the thermometer is used to detect the temperature of the insulating oil in the detection tank; the thermometer is electrically connected to the control device 4. Among them, the detection data also includes the temperature of the insulating oil in the detection tank 72, and the control device 4 is also used to receive the temperature of the insulating oil in the detection tank 72, and obtain the water content of the insulating oil according to the pressure in the detection tank 72 and the temperature of the insulating oil in the detection tank 72.

[0085] Usually, a small amount of water is mixed in the insulating oil. Since water has two different states, gaseous and liquid, it will affect the measurement result of the second pressure p2. Therefore, the temperature in the detection tank 72 can be controlled to measure the two different second pressures p2 of water in gaseous and liquid states. In this way, the amount of water can be calculated according to the ideal gas state equation, and then the concentration of water in the insulating oil can be obtained, which is generally parts per million (ppm).

[0086] Exemplarily, the thermometer can be integrated with the vacuum gauge 74 , and the detection end is located in the detection tank 72 , so as to simplify the design and the difficulty of line connection.

[0087] See also Figure 4In some embodiments, the insulating oil detection device 7 further includes a particle size detector 76. The particle size detector 76 includes a fifth oil inlet 761 and a fifth oil outlet 762, wherein the fifth oil inlet 761 is connected to the second oil inlet 711, and the fifth oil outlet 762 is connected to the second oil outlet 712. The particle size detector 76 is used to detect the particle content in the insulating oil, and the particle size detector 76 is electrically connected to the control device 4. The detection data further includes the particle content of the insulating oil. In this way, the particle content of the insulating oil flowing through the first pipeline 71 can be detected in real time, and then the particle contamination of the insulating oil after filtering by the oil filter 2 can be detected in real time, thereby improving the detection accuracy and detection efficiency.

[0088] See also Figure 4 In some embodiments, the insulating oil detection device 7 also includes a flow meter 77. The flow meter 77 is located at the second oil inlet 711 or the second oil outlet 712. The flow meter 77 is used to detect the flow rate of the insulating oil flowing through the first pipeline 71. The flow meter 77 is electrically connected to the control device. Among them, the detection data also includes the flow rate of the insulating oil. In this way, if the second liquid level detection instrument 22 in the second oil tank assembly 2 or the first liquid level detection instrument 32 in the first oil tank assembly 3 fails and cannot detect the liquid level of the insulating oil in the corresponding oil tank, the flow meter 77 can be used to detect whether there is insulating oil flowing in the system pipeline to prevent the oil filter 2 from idling and causing overheating and damage to the oil filter 2.

[0089] It should be noted that, in other embodiments, the insulating oil detection device 7 includes both a particle size detector 76 and a flow meter 77, and the specific installation positions are as described above and will not be repeated.

[0090] Exemplarily, the flow meter 77 may be a mass flow meter; alternatively, the flow meter 77 may be a volume flow meter, either of which may be used.

[0091] For example, the control device 4 can be integrated with the insulating oil detection device 7 to facilitate the connection of the detection circuit. Figure 4 As shown, the interior of the housing 70 can be divided into two chambers by a partition, the detection component in the oil quality detection device 7 is located in the lower chamber, and the control device 4 is located in the upper chamber.

[0092] Exemplarily, the control device 4 may include a data processing unit and a display unit. The data processing unit may be connected to the oil filter 1, the first liquid level detection instrument 32, the first valve 33, the second valve 34, the second liquid level detection instrument 22, the third valve 23, the fourth valve 24, the first float switch 35, the second float switch 36, the third float switch 25, the fourth float switch 26, the vacuum gauge 74, the vacuum pump 73, the thermometer 75, the particle size detector 76 and the flow meter 77. The data processing unit is used to process the received signals and detection data, and display the state of the insulating oil filter system 100 and the parameters of the insulating oil on the display unit; the data processing unit is also used to control the opening and closing of the oil filter 1. The display unit may be a touch screen, which can display the processing results of the data processing unit, and can also interact with the user to operate the insulating oil filter system 100 through the control device 4.

[0093] See also Figure 3 In some embodiments, the first oil tank assembly 3 further includes a first float switch 35 and a second float switch 36. The first float switch 35 is installed at the bottom of the first oil tank 31, and is used to transmit a signal when the liquid level in the first oil tank 31 reaches a third height threshold L3. The second float switch 36 is installed at the top of the first oil tank 31, and is used to transmit a signal when the liquid level in the first oil tank 31 reaches a fourth height threshold L4.

[0094] See also Figure 2 The second oil tank assembly 2 further includes a third float switch 25 and a fourth float switch 26. The third float switch 25 is installed at the bottom of the second oil tank 21, and is used to transmit a signal when the liquid level in the second oil tank 21 reaches a third height threshold L3. The fourth float switch 26 is installed at the top of the second oil tank 21, and is used to transmit a signal when the liquid level in the second oil tank 21 reaches a fourth height threshold L4.

[0095] Wherein, L3≤L1, L4≥L2; the control device 4 is electrically connected to the first float switch 35, the second float switch 36, the third float switch 25 and the fourth float switch 26. The control device 4 is also used to: control the first valve 33 to close when receiving a signal from the first float switch 35; control the second valve 34 to close when receiving a signal from the second float switch 36; control the third valve 23 to close when receiving a signal from the third float switch 25; and control the fourth valve 24 to close when receiving a signal from the fourth float switch 26. In addition, the control device 4 is also used to: control the oil filter 1 to close when receiving a signal from any one of the first float switch 35, the second float switch 36, the third float switch 25 and the fourth float switch 26.

[0096] With such a design, the control device 4 can close the corresponding valve to stop the oil discharge when the insulating oil in the first oil tank 31 or the second oil tank 21 is about to be emptied (the liquid level reaches the third height threshold L3), so as to prevent the oil filter 2 from being damaged due to idling and overheating due to the lack of insulating oil in the pipeline. The control device 4 can also close the corresponding valve to stop the oil filling when the insulating oil in the first oil tank 31 or the second oil tank 21 is about to be filled (the liquid level reaches the fourth height threshold L4), so as to prevent the problem of excessive oil injection due to the oil tank filling. On this basis, when the control device 4 receives a signal from any one of the first float switch 35, the second float switch 36, the third float switch 25 and the fourth float switch 26, it turns off the oil filter 1 and stops the insulating oil filter system 100 from working. In this way, it can prevent the corresponding valve on the first oil tank 31 or the second oil tank 21 from malfunctioning, causing the insulating oil filter system 100 to malfunction and cause safety hazards.

[0097] For example, the value of L3 may be 100 mm or 75 mm, and the value of L4 may be 2500 mm or 2550 mm.

[0098] For example, when the control device 4 receives the signal transmitted by the corresponding float switch, in addition to controlling the corresponding valve to close, it can also send an alarm message to remind the user. If the corresponding valve fails to close, the oil filter 1 is directly closed to ensure the safety of the system.

[0099] See also Figure 3 In some embodiments, the first oil tank 31 further has a first breathing port 311, and the first breathing port 311 is located at the top of the first oil tank 31. The first oil tank assembly 3 further includes a first breathing valve 37 and a first desiccant 38, and the first desiccant 38 is connected between the first breathing valve 37 and the first breathing port 311.

[0100] See also Figure 2 The second oil tank 21 also has a second breathing port 211, and the second breathing port 211 is located at the top of the second oil tank 21. The second oil tank assembly 2 also includes a second breathing valve 27 and a second moisture absorber 28, and the second moisture absorber 28 is connected between the second breathing valve 37 and the second breathing port 211.

[0101] With such a design, the first oil tank 31 or the second oil tank 21 can ensure that the space inside the tank is isolated from the atmosphere within a certain pressure range through the corresponding breathing valve, and can communicate with the atmosphere (breathe) when the pressure exceeds or falls below this pressure range, thereby preventing the tank from being damaged due to overpressure or vacuum, and reducing the evaporation loss of the insulating oil. In addition, the corresponding desiccant can prevent moisture in the air from penetrating into the insulating oil and affecting the insulating performance of the insulating oil.

[0102] Exemplarily, the breathing valve and the corresponding breathing port may be connected via a pipeline, and the desiccant is disposed on the corresponding pipeline.

[0103] See also Figure 3 In some embodiments, the first oil tank 31 further has a first pressure relief port 312, and the first pressure relief port 312 is located at the top of the first oil tank 31. The first oil tank assembly 3 further includes a first safety valve 39, which is installed at the first pressure relief port 312 of the first oil tank 31.

[0104] See also Figure 2 The second oil tank 21 also has a second pressure relief port 212, and the second pressure relief port 212 is located at the top of the second oil tank 21. The second oil tank assembly 2 also includes a second safety valve 29, which is installed at the second pressure relief port 212 of the second oil tank 21.

[0105] With such a design, when the pressure in the first oil tank 31 or the second oil tank 21 is too high, the pressure can be released through the corresponding safety valve to ensure the safety and reliability of the insulating oil filtering system 100 .

[0106] See also Figure 3 In some embodiments, the first oil tank 31 further comprises a first sampling port 313, and the first sampling port 313 is located at the bottom of the first oil tank 31. The first oil tank assembly 3 further comprises a fifth valve 30, which is installed at the first sampling port 313, and the fifth valve 30 is used to open and close the first sampling port 313.

[0107] See also Figure 2 The second oil tank 21 also has a second sampling port 213, and the second sampling port 213 is located at the bottom of the second oil tank 21. The second oil tank assembly 2 also includes a sixth valve 20, which is installed at the second sampling port 213; the sixth valve 20 is used to open and close the second sampling port 213.

[0108] With such a design, the insulating oil in the first oil tank 31 or the second oil tank 21 can be tested by manual sampling, and the test results of the insulating oil detection device 7 can be combined to determine whether the insulating oil is qualified, thereby ensuring the quality of the insulating oil and further ensuring the reliability of the transformer main equipment.

[0109] See also Figure 5 Some embodiments of the present invention provide an insulating oil filtering method, which is applied to the insulating oil filtering system 100 described in any of the above embodiments. The insulating oil filtering method includes S100.

[0110] S100: Execute at least one oil filtering cycle process, the oil filtering cycle process includes S101 to S102 (such as Figure 6 shown).

[0111] S101: For any first oil tank assembly 3 and second oil tank assembly 2: if the detection result of the first liquid level detection instrument 32 is greater than the first height threshold L1, and the detection result of the second liquid level detector 22 is less than the second height threshold L2, the first valve 33 and the fourth valve 24 are controlled to be opened, and the second valve 34 and the third valve 23 are controlled to be closed.

[0112] S102: If the detection result of the second liquid level detection instrument 22 is equal to the second height threshold L2, and the detection result of the first liquid level detection instrument 32 is less than the second height threshold L2, the third valve 23 and the second valve 24 are controlled to be opened, and the first valve 33 and the fourth valve 24 are controlled to be closed; wherein, L2>L1.

[0113] Exemplarily, the oil filter machine 2 may be turned on before step S100; or, the oil filter machine 2 may be turned on between step S101 and step S102, and both are usable.

[0114] For example, for any one of the first oil tank assembly 3 and the second oil tank assembly 2, one oil filtering cycle process may be performed; or, multiple oil filtering cycles may be performed until the quality of the insulating oil after filtering is qualified.

[0115] The beneficial technical effects of the insulating oil filtering method provided by the present invention are the same as the beneficial technical effects of the insulating oil filtering system 100 provided by the embodiment of the present invention, and will not be repeated here.

[0116] See also Figure 7 In some embodiments, before performing at least one oil filtering cycle process, the insulating oil filtering method further includes S200.

[0117] S200: Obtaining the oil filtering order of the N first oil tank assemblies 3, and performing at least one oil filtering cycle process on the N first oil tank assemblies 3 in sequence according to the oil filtering order; N≥2.

[0118] Exemplarily, the oil filtering order may be determined according to the position of the first oil tank assembly 3 ; or, the oil filtering order may also be determined according to the number of the first oil tank assembly 3 .

[0119] With such a design, the insulating oil in the N first oil tank assemblies 3 can be circulated and filtered in turn according to the oil filtering order, that is, after the insulating oil in the current first oil tank assembly 3 is qualified, after the current oil filtering cycle of the current first oil tank assembly 3 is completed, the insulating oil in the next first oil tank assembly 3 is continuously circulated and filtered. In this way, there is no need to frequently start and stop the oil filter machine 1, and the insulating oil in all the first oil tank assemblies 3 can be continuously filtered, which improves the automation and work efficiency of the system, and further improves the installation efficiency of the main equipment of the transformer.

[0120] See also Figure 8 In some embodiments, when the oil filtering system 100 includes the insulating oil detection device 7, the insulating oil filtering method further includes S300 and S400.

[0121] S300: receiving detection data from the insulating oil detection device 7, and obtaining at least one of the flow rate, water content, gas content and particle content of the insulating oil according to the detection data.

[0122] S400: If it is determined that the water content, gas content and particle content are less than the set values, after the current oil filtering cycle is executed, at least one oil filtering cycle is executed for the next first oil tank assembly 3 according to the oil filtering order.

[0123] Exemplarily, step S300 and step S400 can be performed simultaneously with step S200 and step S100, that is, when the insulating oil is filtered in sequence, it is detected in real time whether the insulating oil meets the use requirements, and whether to perform the oil filtering cycle process on the next first oil tank assembly 3 is adjusted according to the detection result.

[0124] Exemplarily, the set value of the water content may be 5 mg / L.

[0125] For example, the set value of the gas content may be 0.1%.

[0126] Exemplarily, the set value of the particle content may be that the number of particles larger than 5 um in 100 mL of insulating oil is less than or equal to 2000.

[0127] With such a design, the insulating oil after filtering by the oil filter 1 can be tested in real time, and the relevant parameters of the insulating oil can be obtained based on the test data and recorded and stored in real time, so as to judge in real time whether the insulating oil after filtering meets the use requirements, thereby improving the efficiency of the insulating oil filtering treatment and further improving the installation efficiency of the transformer main equipment.

[0128] See also Fig. 9 In some embodiments, before obtaining the oil filtering order of the N first oil tank assemblies 3, the insulating oil filtering method further includes S500 and S600.

[0129] S500: Obtaining the oil filling order of N first oil tank assemblies 3;

[0130] S600: Perform the oil filling process on the N first oil tank assemblies 3 in sequence according to the oil filling order. The oil filling process includes S601 and S602 (such as Fig.10 shown).

[0131] S601: If in a first oil tank assembly 3, the detection result of the first liquid level detection instrument 32 is less than or equal to the first height threshold L1, the second valve 34 is controlled to be opened, and the first valve 33 is controlled to be closed.

[0132] S602: If the detection result of the first liquid level detection instrument 32 is equal to the second height threshold L2, the second valve 34 is controlled to be closed.

[0133] Illustratively, before step S500, the first oil inlet 11 of the oil filter 2 can be connected to the outlet of the insulating oil transportation equipment (such as a tanker truck), and then the oil filter 2 can be turned on; alternatively, the oil filter 2 can be turned on between step S500 and step S600, both of which can be used.

[0134] Exemplarily, the oil filling sequence may be determined according to the positions of the first oil tank assemblies 3 ; or, the oil filling sequence may also be determined according to the numbers of the first oil tank assemblies 3 .

[0135] With such a design, the insulating oil in the insulating oil transport equipment can be continuously injected into the N first oil tanks 31 through the oil filter 1, thereby avoiding frequent switching of the oil filling port to reduce the oil filling efficiency, thereby affecting the installation efficiency of the transformer main equipment.

[0136] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art who is familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. An insulating oil filtration system, characterized in that: include: The oil filter comprises a first oil inlet and a first oil outlet; N first oil tank assemblies, each of which includes a first oil tank, a first liquid level detection instrument, a first valve, and a second valve; the first oil tank is connected to the first oil inlet of the oil filter through the first valve, and the first oil tank is connected to the first oil outlet of the oil filter through the second valve; the first liquid level detection instrument is installed on the first oil tank, and is used to detect the liquid level height in the first oil tank; N≥2, N is an integer; a second oil tank assembly, the second oil tank assembly comprising a second oil tank, a second liquid level detection instrument, a third valve and a fourth valve; the second oil tank is connected to the first oil inlet of the oil filter through the third valve, and the second oil tank is connected to the first oil outlet of the oil filter through the fourth valve; the second liquid level detection instrument is installed on the second oil tank, and is used to detect the liquid level height in the second oil tank; and, A control device is electrically connected to the oil filter, the first liquid level detection instrument, the first valve, the second valve, the second liquid level detection instrument, the third valve and the fourth valve; for any one of the first oil tank assembly and the second oil tank assembly: if the detection result of the first liquid level detection instrument is greater than the first height threshold L1, and the detection result of the second liquid level detection instrument is less than the second height threshold L2, then the control device is used to control the first valve and the fourth valve to open, and control the second valve and the third valve to close; if the detection result of the second liquid level detection instrument is equal to the second height threshold L2, and the detection result of the first liquid level detection instrument is less than the second height threshold L2, then the third valve and the second valve are controlled to open, and the first valve and the fourth valve are controlled to close; wherein, L2>L1.

2. The insulating oil filtration system according to claim 1, characterized in that: The insulating oil filtration system further comprises: an oil inlet main line having a first port and a plurality of first openings; the first port is detachably connected to the first oil inlet of the oil filter, one of the first oil tanks is connected to one of the first openings through the first valve, and one of the second oil tanks is connected to one of the first openings through the third valve; and The main oil outlet line has a second port and a plurality of second openings; the second port is connected to the first oil outlet of the oil filter, one of the first oil tanks is connected to one of the second openings through the second valve, and one of the second oil tanks is connected to one of the second openings through the fourth valve.

3. The insulating oil filtration system according to claim 1 or 2, characterized in that: The insulating oil filtering system further includes: an insulating oil detection device, including a second oil inlet and a second oil outlet, the second oil inlet is connected to the first oil outlet, and the second oil outlet is connected to the second oil tank and N first oil tanks; The control device is electrically connected to the insulating oil detection device, and is further used to: receive detection data from the insulating oil detection device, and obtain at least one of the flow rate, water content, gas content and particle content of the insulating oil flowing through the insulating oil detection device according to the detection data; if the water content, the gas content and the particle content are less than set values, then when the detection result of the first liquid level detection instrument is equal to the second height threshold L2, control the first valve, the second valve, the third valve and the fourth valve to be closed.

4. The insulating oil filtration system according to claim 3, characterized in that: The insulating oil detection device comprises: A first pipeline having the second oil inlet and the second oil outlet; A detection tank, comprising a third oil inlet and a third oil outlet, wherein the third oil inlet is connected to the second oil inlet, and the third oil outlet is connected to the second oil outlet; a vacuum pump, connected to the detection tank; and A vacuum gauge, wherein the detection end of the vacuum gauge is located in the detection tank, and the vacuum gauge is used to detect the pressure in the detection tank; Wherein, the vacuum pump and the vacuum gauge are electrically connected to the control device; the detection data includes the pressure in the detection tank; the control device is also used to control the opening and closing of the vacuum pump, and to receive the pressure in the detection tank, and obtain the gas content of the insulating oil according to the pressure in the detection tank.

5. The insulating oil filtration system according to claim 4, characterized in that: The insulating oil detection device also includes: a micro-water detector, comprising a fourth oil inlet and a fourth oil outlet, wherein the fourth oil inlet is connected to the second oil inlet, and the fourth oil outlet is connected to the second oil outlet; the micro-water detector is used to detect the water content in the insulating oil, and the micro-water detector is electrically connected to the control device; Wherein, the detection data also includes the water content of the insulating oil.

6. The insulating oil filtration system according to claim 4, characterized in that: The insulating oil detection device also includes: a particle size detector, comprising a fifth oil inlet and a fifth oil outlet, wherein the fifth oil inlet is connected to the second oil inlet, and the fifth oil outlet is connected to the second oil outlet; the particle size detector is used to detect the particle content in the insulating oil, and the particle size detector is electrically connected to the control device; and / or, a flow meter, located at the second oil inlet or the second oil outlet; the flow meter is used to detect the flow rate of the insulating oil flowing through the first pipeline, and the flow meter is electrically connected to the control device; The detection data further includes the particle content of the insulating oil and / or the flow rate of the insulating oil.

7. The insulating oil filtration system according to claim 1 or 2, characterized in that: The first oil tank assembly further includes: a first float switch and a second float switch; the first float switch is installed at the bottom end of the first oil tank, and is used to transmit a signal when the liquid level in the first oil tank reaches a third height threshold L3; the second float switch is installed at the top end of the first oil tank, and is used to transmit a signal when the liquid level in the first oil tank reaches a fourth height threshold L4; The second oil tank assembly further includes: a third float switch and a fourth float switch; the third float switch is installed at the bottom end of the second oil tank, and is used to transmit a signal when the liquid level in the second oil tank reaches a third height threshold L3; the fourth float switch is installed at the top end of the second oil tank, and is used to transmit a signal when the liquid level in the second oil tank reaches a fourth height threshold L4; Among them, L3≤L1, L4≥L2; the control device is electrically connected to the first float switch, the second float switch, the third float switch and the fourth float switch; the control device is also used to: control the first valve to be closed when receiving the signal of the first float switch; control the second valve to be closed when receiving the signal of the second float switch; control the third valve to be closed when receiving the signal of the third float switch; control the fourth valve to be closed when receiving the signal of the fourth float switch; and control the oil filter to be closed when receiving the signal of any one of the first float switch, the second float switch, the third float switch and the fourth float switch.

8. The insulating oil filtration system according to claim 1 or 2, characterized in that: The first oil tank also has a first breathing port, which is located at the top of the first oil tank; the first oil tank assembly also includes a first breathing valve and a first desiccant, and the first desiccant is connected between the first breathing valve and the first breathing port; The second oil tank also has a second breathing port, which is located at the top of the second oil tank; the second oil tank assembly also includes a second breathing valve and a second desiccant, which is connected between the second breathing valve and the second breathing port.

9. The insulating oil filtration system according to claim 1 or 2, characterized in that: The first oil tank also has a first pressure relief port, and the first pressure relief port is located at the top of the first oil tank; the first oil tank assembly also includes: a first safety valve, installed at the first pressure relief port of the first oil tank; The second oil tank also has a second pressure relief port, which is located at the top of the second oil tank; the second oil tank assembly also includes: a second safety valve installed at the second pressure relief port of the second oil tank.

10. The insulating oil filtration system according to claim 1 or 2, characterized in that: The first oil tank also has a first sampling port, which is located at the bottom of the first oil tank; the first oil tank assembly also includes: a fifth valve installed at the first sampling port; the fifth valve is used to open and close the first sampling port; The second oil tank also has a second sampling port, which is located at the bottom of the second oil tank; the second oil tank assembly also includes: a sixth valve installed at the second sampling port; the sixth valve is used to open and close the second sampling port.

11. A method for filtering insulating oil, characterized in that: The insulating oil filtering system applied to any one of claims 1 to 10, wherein the insulating oil filtering method comprises: Perform at least one oil filtering cycle process, the oil filtering cycle process comprising: For any one of the first oil tank assembly and the second oil tank assembly: if the detection result of the first liquid level detection instrument is greater than a first height threshold L1, and the detection result of the second liquid level detection instrument is less than a second height threshold L2, the first valve and the fourth valve are controlled to be opened, and the second valve and the third valve are controlled to be closed; and If the detection result of the second liquid level detection instrument is equal to the second height threshold L2, and the detection result of the first liquid level detection instrument is less than the second height threshold L2, the third valve and the second valve are controlled to be opened, and the first valve and the fourth valve are controlled to be closed; wherein, L2>L1.

12. The insulating oil filtering method according to claim 11, characterized in that: Before performing at least one oil filtering cycle, the insulating oil filtering method further comprises: Obtain an oil filtering order for the N first oil tank assemblies, and perform the oil filtering cycle process on the N first oil tank assemblies in sequence at least once according to the oil filtering order; N≥2.

13. The insulating oil filtering method according to claim 12, characterized in that: In the case where the oil filtering system includes an insulating oil detection device, the insulating oil filtering method further includes: receiving detection data from the insulating oil detection device, and obtaining at least one of the flow rate, water content, gas content and particle content of the insulating oil according to the detection data; and If it is determined that the water content, the gas content and the particle content are less than the set values, after the current oil filtering cycle is executed, the oil filtering cycle is executed at least once for the next first oil tank assembly according to the oil filtering order.

14. The insulating oil filtering method according to claim 12 or 13, characterized in that: Before obtaining the oil filtering order of the N first oil tank assemblies, the insulating oil filtering method further includes: Obtaining the oil filling order of the N first oil tank assemblies; and Performing an oil filling process on the N first oil tank assemblies in sequence according to the oil filling sequence; Wherein, the oil injection process includes: If in one of the first oil tank assemblies, the detection result of the first liquid level detection instrument is less than or equal to the first height threshold L1, the second valve is controlled to be opened and the first valve is controlled to be closed; If the detection result of the first liquid level detection instrument is equal to the second height threshold L2, the second valve is controlled to be closed.

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