On-line filtering and monitoring device for transformer oil

Abstract

The utility model provides an on-line filtering and monitoring device for transformer oil. The on-line filtering and monitoring device comprises a detection device and an oil inlet filter, an oil inlet of the oil inlet filter is communicated with an oil outlet of the transformer, an oil outlet of the oil inlet filter is communicated with an oil inlet of the detection device, and an oil outlet of the detection device is communicated with an oil return port of the transformer; according to the invention, the detection device is arranged in the transformer oil circulating filtering oil path, so that a set of circulating pipeline can be effectively reduced, and the convenience of field installation and maintenance is improved.

Description

Technical Field

[0001] This utility model belongs to the field of online transformer oil filtration technology, specifically relating to an online filtration monitoring device for transformer oil. Background Technology

[0002] Transformer oil, as the medium for insulation and cooling of transformers, directly affects the normal operation of the transformer and the online monitoring system for transformer oil. However, during transformer operation, impurities such as metal fragments and dust can easily mix into the transformer oil, necessitating filtration to ensure the stable operation of the transformer and the online monitoring system for transformer oil.

[0003] Utility model patent application number CN202020675836 2 discloses an online transformer oil filtration monitoring system, which includes a circulating oil tank, a detection component, and a main control device. The circulating oil tank's outlet pipe is sequentially equipped with a filter, a three-way valve, and a return oil pipe, which is connected to the return port of the circulating oil tank. The detection component is connected to the circulating oil tank. However, as shown in the attached drawings, the circulating oil circuit of the detection component is independently set up from the transformer oil circulating oil circuit, without interference, resulting in numerous pipelines and inconvenience for on-site installation and maintenance. Utility Model Content

[0004] In view of the shortcomings of the prior art, the purpose of this utility model is to provide an online filtration and monitoring device for transformer oil that is easy to disassemble and maintain.

[0005] To achieve the above and other related objectives, this utility model provides an online filtration monitoring device for transformer oil, including a detection device and an oil inlet filter; the oil inlet of the oil inlet filter is connected to the oil outlet of the transformer, the oil outlet of the oil inlet filter is connected to the oil inlet of the detection device, and the oil outlet of the detection device is connected to the oil return port of the transformer; this invention sets the detection device in the transformer oil circulation filtration circuit, which can effectively reduce one set of circulation pipeline and improve the convenience of on-site installation and maintenance.

[0006] Preferably, the oil inlet filter includes a housing, a cover, and a filter element; the filter element is detachably disposed inside the housing, and the cover is detachably mounted on the housing; thus, the replacement and maintenance of the filter element can be easily completed.

[0007] Preferably, the oil inlet and oil outlet of the oil filter are located on different side walls of the housing, and the oil outlet of the oil filter is provided with an oil outlet connector installed on the detection device in a through-plate and through-wall manner; in this way, the oil filter and the detection device can be assembled into a whole, which not only further reduces the number of pipelines, but also reduces the risk of oil leakage between the oil filter and the detection device.

[0008] Preferably, the oil outlet of the detection device is connected to the oil return port of the transformer via an oil return filter to perform secondary filtration on the tested oil.

[0009] Preferably, the oil return filter includes a housing, a cover, and a filter element; the filter element is detachably disposed inside the housing, and the cover is detachably mounted on the housing; the housing of the oil return filter is provided with an oil inlet communicating with the inner side of the corresponding filter element and an oil outlet communicating with the outer side of the corresponding filter element, so as to facilitate the replacement of the filter element.

[0010] Preferably, the oil inlet and oil outlet of the oil return filter are located on different side walls of the housing, and the oil inlet of the oil return filter is provided with an oil inlet connector that is installed on the detection device in a through-plate and through-wall manner, so as to assemble the oil return filter on the detection device.

[0011] Preferably, the filter element is a sintered stainless steel filter element to improve its service life.

[0012] Preferably, the online filtration monitoring device includes a first three-way valve and a second three-way valve; both the first and second three-way valves include a valve body, a valve core, and a valve core drive; the valve body is provided with a first connector, a second connector, and a third connector that communicate with each other, and the valve core is rotatably disposed within the valve body; the valve core rotates under the action of the valve core drive to switch between a first position and a second position; when the valve core is in the first position, the first connector and the second connector are connected; when the valve core is in the second position, the first connector and the third connector are connected; the first connector of the first three-way valve is connected to the... The oil inlet of the inlet filter is connected, and the second connector of the first three-way valve is connected to the oil outlet of the transformer; the first connector of the second three-way valve is connected to the oil outlet of the return oil filter, and the second connector of the second three-way valve is connected to the oil return port of the transformer; the third connectors of the first and second three-way valves are spare test connectors; thus, the third connector of the first three-way valve can be used as the oil inlet for testing other transformer oils, and the third connector of the second three-way valve can be used as the oil return port for testing other transformer oils, so as to complete the online filtration and testing of other transformer oils.

[0013] Preferably, the detection device is a gas monitoring device for transformer oil.

[0014] Preferably, a sealing ring is provided between the housing and the cover to prevent leakage.

[0015] As described above, the online filtration monitoring device for transformer oil of this utility model has the following beneficial effects:

[0016] 1) This application sets the detection device in the circulating filtration oil circuit formed by the transformer and the inlet oil filter, so as to realize the circulating filtration and circulating detection of transformer oil in one circulating oil circuit. Compared with the traditional two independent circulating pipelines, the number of pipelines is greatly reduced, which not only facilitates on-site installation and maintenance, but also reduces the space occupied. In addition, this application adds return oil filters at the oil outlet of the detection device and the return oil outlet of the transformer, which can further improve the circulating filtration effect of transformer oil.

[0017] 2) Both the inlet and return oil filters in this application are designed with detachable filter elements, and both the inlet and return oil filters are integrated into the detection device in a through-plate and through-wall manner. This not only facilitates the replacement and maintenance of filter elements, but also further reduces pipelines and improves on-site installation efficiency. In addition, the setting of the first three-way valve and the second three-way valve makes it convenient for users to filter and detect transformer oil other than that of the transformer, thereby improving the utilization rate of the filtration monitoring device. Attached Figure Description

[0018] Figure 1 A schematic diagram of an online transformer oil filtration and monitoring device provided in an embodiment of this utility model (transformer not shown).

[0019] Figure 2 This is an exploded 3D view of the filter.

[0020] Figure 3 This is a schematic diagram of the filter element in a filter.

[0021] Figure 4 This is a schematic diagram of the structure after the oil inlet filter and the first three-way valve are assembled.

[0022] Figure 5 This is a schematic diagram of the structure after the return oil filter and the second three-way valve are assembled.

[0023] Figure 6 This is a schematic diagram of the internal valve core of a three-way valve.

[0024] Explanation of reference numerals in the attached figures

[0025] The device includes: detection device 1, inlet filter 2a, return filter 2b, housing 21, inlet connector 211, outlet connector 212, housing cover 22, filter element 23, core 231, adapter 232, oil passage 233, sealing ring 24, first three-way valve 3a, second three-way valve 3b, first connector 311, second connector 312, third connector 313, valve core 32, first flow hole 321, second flow hole 322, and valve core drive component 33. Detailed Implementation

[0026] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0027] Please see Figures 1 to 6 It should be understood that the structures, proportions, sizes, etc., illustrated in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and are not intended to limit the scope of this invention. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of this invention, should still fall within the scope of the disclosed technical content. Furthermore, the terms "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and not intended to limit the scope of this invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this invention.

[0028] The online filtration and monitoring device for transformer oil provided in this embodiment is used to connect to the transformer to achieve online filtration and detection of the transformer oil; such as Figure 1 and Figure 2 As shown, the online filtration monitoring device includes a detection device 1 and an oil inlet filter 2a. The oil inlet of the oil inlet filter 2a is connected to the oil outlet of the transformer, the oil outlet of the oil inlet filter 2a is connected to the oil inlet of the detection device 1, and the oil outlet of the detection device 1 is connected to the oil return port of the transformer. In this way, the transformer, the oil inlet filter 2a, and the detection device 1 can be connected in series to form a circulating oil circuit that can realize transformer oil filtration and detection. Compared with the traditional scheme of using two independent circulating oil circuits for filtration and detection, the scheme of this application can significantly reduce the number of pipelines, reduce the difficulty of on-site installation and maintenance, and reduce the overall space occupied.

[0029] In a preferred embodiment, such as Figure 2 As shown, the oil inlet filter 2a includes a housing 21, a cover 22, and a filter element 23. The filter element 23 is detachably installed inside the housing 21 by means of insertion or other means, and the cover 22 is installed on the housing 21 by means of bolts, clips, or other detachable structures. Thus, the filter element 23 can be replaced simply by removing the cover 22.

[0030] It is understood that the oil inlet and oil outlet of the oil filter 2a can be located on the housing 21 or the cover 22, and there is no limitation on this, as long as the oil inlet of the oil filter 2a is connected to the inside of the filter element 23 and the oil outlet of the oil filter 2a is connected to the outside of the filter element 23; in this embodiment, the oil inlet and oil outlet of the oil filter 2a are preferably located on the housing 21.

[0031] At this time, as Figure 3 As shown, the filter element 23 includes a core 231 and an adapter 232 located at the upper end of the core 231. The adapter 232 is provided with an oil channel 233 that connects the oil inlet to the inside of the core 231, ensuring that the transformer oil coming in through the oil inlet can smoothly enter the inside of the core 231 through the oil channel 233, and be filtered layer by layer from the outside to the inside of the core 231. The filtered transformer oil is discharged from the oil inlet filter 2a through the oil outlet.

[0032] It should be noted that the outer diameter of the adapter 232 is not less than the outer diameter of the core 231; in this embodiment, the outer diameter of the adapter 232 needs to be greater than the outer diameter of the core 231. In this way, when the filter element 23 is inserted into the stepped hole in the housing 21, the step structure of the stepped hole can stably support the adapter 232, ensuring the insertion stability of the filter element 23.

[0033] It should be noted that, in order to prevent oil from leaking into the gap between the oil inlet and the oil channel 233 and into the gap between the housing 21 and the filter element 23, resulting in the leaked oil being discharged without being filtered, the oil supply connector for supplying oil needs to be inserted into the oil channel 233 through the oil inlet for oil supply; of course, in order not to affect the replacement of the filter element 23, the inserted oil supply connector can also be removed from the oil channel 233.

[0034] It is understood that the oil supply connector can be threaded or directly plugged into the oil channel 233, and there is no limitation on this. In this embodiment, the oil supply connector is preferably threaded into the oil channel 233. In order to prevent oil from spreading and leaking along the threads, PTFE tape can be wrapped around the threads of the oil supply connector.

[0035] It should be noted that a sealing ring 24 is provided between the housing 21 and the cover 22 to prevent oil from seeping out from the gap between the housing 21 and the cover 24.

[0036] Of course, in other embodiments, the oil inlet filter 2a may also adopt an integrated filter structure.

[0037] like Figure 1 and Figure 4 As shown, in order to further reduce the pipeline structure and improve the integration of the entire online filter monitoring device, the oil inlet and oil outlet of the oil filter 2a need to be located on different side walls of the housing 21, and an oil outlet connector 212 is provided at the oil outlet of the oil filter 2a. The oil outlet connector 212 penetrates the housing of the detection device 1 and is connected to the oil inlet of the detection device 1, so that the oil filter 2a is installed on the detection device 1 in a through-plate and through-wall manner. This installation method can further improve the structural compactness of the online filter monitoring device, thereby reducing the space occupied.

[0038] In a further embodiment, such as Figure 1 As shown, the oil outlet of the detection device 1 is connected to the oil return port of the transformer via the oil return filter 2b; the filter pore size of the oil return filter 2b is preferably smaller than that of the oil inlet filter 2a, so as to achieve double filtration during the circulation process.

[0039] It should be noted that the structure of the return oil filter 2b is the same as that of the inlet oil filter 2a; see the attached diagram for details. Figure 2 This will not be elaborated upon here.

[0040] It should be noted that, since transformer oil contains certain acidic substances, the shell 21 and the cover 22 need to be made of corrosion-resistant materials such as stainless steel and aluminum alloy. The filter element 23 is preferably made of stainless steel sintered filter element, and the sealing ring 24 is preferably made of corrosion-resistant O-ring.

[0041] In addition, to ensure the insulation performance of the transformer oil, the inlet filter 2a and the return filter 2b are equipped with micron-level filtration precision to effectively remove air bubbles and oil suds from the transformer oil.

[0042] Of course, in order to improve the integration of the return oil filter 2b with the detection device 1, such as Figure 1 and Figure 5 As shown, the oil inlet and outlet of the return oil filter 2b need to be located on different side walls of the housing 21, and an oil inlet connector 211 is provided at the oil inlet of the return oil filter 2b. The oil inlet connector 211 penetrates the housing of the detection device 1 and is connected to the oil outlet of the detection device 1, so that the return oil filter 2b is installed on the detection device 1 in a through-plate and through-wall manner. This installation method can further improve the structural compactness of the online filtration monitoring device, thereby reducing the space occupied.

[0043] In a further embodiment, such as Figure 1 , Figure 4 , Figure 5 and Figure 6 As shown, the online filtration monitoring device also includes a first three-way valve 3a and a second three-way valve 3b; both the first three-way valve 3a and the second three-way valve 3b include a valve body 31, a valve core 32 and a valve core drive member 33; wherein, the valve body 31 is provided with a first connector 311, a second connector 312 and a third connector 313 that are interconnected, and the valve core 32 is rotatably disposed within the valve body 31; thus, when the valve core 32 rotates under the action of the valve core drive member 33, it can switch between a first position connecting the first connector 131 and the second connector 132 and a second position connecting the first connector 131 and the third connector 133.

[0044] Specifically, such as Figure 4 and Figure 5As shown, the first connector 311 of the first three-way valve 3a is connected to the oil inlet of the oil filter 2a, and the second connector 312 of the first three-way valve 3a is connected to the oil outlet of the transformer; the first connector 311 of the second three-way valve 3b is connected to the oil outlet of the return oil filter 2b, and the second connector 312 of the second three-way valve 3b is connected to the return oil outlet of the transformer; while the third connectors 313 of the first three-way valve 3a and the third connectors 313 of the second three-way valve 3b can be used as spare connectors to connect to other transformer oil sources. Thus, by simply adjusting the state of each three-way valve, transformer oil from different transformer oil sources can be filtered and detected online, improving the utilization rate of the online filtration monitoring device.

[0045] It should be noted that in each three-way valve, the first connector 311, the second connector 312, and the third connector 313 can be arranged perpendicularly to each other, or the second connector 312 and the third connector 313 can be arranged collinearly, and the first connector 311 can be arranged perpendicularly to the second connector 312. There is no limitation on this. For ease of operation, in this embodiment, the second connector 312 and the third connector 313 are arranged collinearly in the vertical direction, the first connector 311 is arranged perpendicularly to the second connector 312, and the first connector 311 is arranged collinearly with the rotation axis of the valve core drive 33.

[0046] At this time, as Figure 6 As shown, the valve core 32 is spherical in shape, and has a first flow hole 321 and a second flow hole 322 that are vertically connected. The first flow hole 321 is always connected to the first connector 311, and the second flow hole 322 can be switched between a first position connected to the second connector 312 and a second position connected to the third connector 313, so as to realize the circulation filtration and detection of transformer oil from different sources.

[0047] It is understood that the detection device 1 mentioned above can be any transformer oil monitoring device, such as a transformer oil gas monitoring device or a contaminant monitoring device, and is not limited thereto. In this embodiment, the detection device 1 is preferably a transformer oil gas monitoring device, which is used to analyze the gas in the transformer oil to determine whether the transformer has malfunctioned. Since the transformer oil gas monitoring device is existing technology, it will not be described in detail here.

[0048] In summary, this utility model effectively overcomes the various shortcomings of the prior art and has high industrial application value.

[0049] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. An online filtration monitoring device for transformer oil, comprising a detection device (1) and an inlet filter (2a); characterized in that, The oil inlet of the oil filter (2a) is connected to the oil outlet of the transformer, the oil outlet of the oil filter (2a) is connected to the oil inlet of the detection device (1), and the oil outlet of the detection device (1) is connected to the oil return port of the transformer.

2. The online filtration monitoring device according to claim 1, characterized in that, The oil inlet filter (2a) includes a housing (21), a cover (22) and a filter element (23); the filter element (23) is detachably disposed inside the housing (21), and the cover (22) is detachably mounted on the housing (21).

3. The online filtration monitoring device according to claim 2, characterized in that, The oil inlet and outlet of the oil filter (2a) are located on different side walls of the housing (21), and the oil outlet of the oil filter (2a) is provided with an oil outlet connector (212) installed on the detection device (1) in a through-plate and through-wall manner.

4. The online filtration monitoring device according to any one of claims 1 to 3, characterized in that, The oil outlet of the detection device (1) is connected to the oil return port of the transformer via the oil return filter (2b).

5. The online filtration monitoring device according to claim 4, characterized in that, The return oil filter (2b) includes a housing (21), a cover (22), and a filter element (23); the filter element (23) is detachably disposed inside the housing (21), and the cover (22) is detachably installed on the housing (21); the housing (21) of the return oil filter (2b) is provided with an oil inlet communicating with the inner side of the corresponding filter element and an oil outlet communicating with the outer side of the corresponding filter element.

6. The online filtration monitoring device according to claim 5, characterized in that, The oil inlet and outlet of the oil return filter (2b) are located on different side walls of the housing (21), and the oil inlet of the oil return filter (2b) is provided with an oil inlet connector (211) installed on the detection device (1) in a through-plate and through-wall manner.

7. The online filtration monitoring device according to any one of claims 2 to 3, characterized in that, The filter element (23) is a sintered stainless steel filter element.

8. The online filtration monitoring device according to claim 4, characterized in that, The online filtration monitoring device includes a first three-way valve (3a) and a second three-way valve (3b); both the first three-way valve (3a) and the second three-way valve (3b) include a valve body (31), a valve core (32), and a valve core drive (33); the valve body (31) is provided with a first connector (311), a second connector (312), and a third connector (313) that are interconnected, and the valve core (32) is rotatably disposed within the valve body (31); the valve core (32) rotates under the action of the valve core drive (33) to switch between a first position and a second position; when the valve core (32) is in the first position, the first connector (311) and the second connector (312) are connected; the valve core (311) 32) When in the second position, the first connector (311) is connected to the third connector (313); the first connector (311) of the first three-way valve (3a) is connected to the oil inlet of the oil filter (2a), and the second connector (312) of the first three-way valve (3a) is connected to the oil outlet of the transformer; the first connector (311) of the second three-way valve (3b) is connected to the oil outlet of the return oil filter (2b), and the second connector (312) of the second three-way valve (3b) is connected to the return oil outlet of the transformer; the third connector (313) of the first three-way valve (3a) and the third connector (313) of the second three-way valve (3b) are spare test connectors.

9. The online filtration monitoring device according to claim 1, characterized in that, The detection device (1) is a gas monitoring device in transformer oil.

10. The online filtration monitoring device according to claim 2, characterized in that, A sealing ring (24) is provided between the housing (21) and the cover (22).

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