A transformer vacuum oiling system

Abstract

This utility model relates to the field of transformer manufacturing technology, and in particular to a transformer vacuum oil injection system, comprising a vacuum oil injection tank, a first vacuum unit, a first transformer, an oil outlet tank, an inner oil injection unit, a second transformer, a second vacuum unit, and an outer oil injection unit; the vacuum oil injection tank is connected to the first vacuum unit, and several first transformers are arranged inside the vacuum oil injection tank; several second transformers are arranged around the vacuum oil injection tank; the second vacuum unit is used to vacuum the several second transformers; the outer oil injection unit is connected to the inner oil injection unit; this utility model accelerates the production cycle of vacuum oil injection, effectively shortens the time the transformer body is exposed to air, reduces the risk of moisture absorption of insulating components, reduces the risk of transformer burnout, and solves the problems of long waiting time from the completion of transformer assembly to vacuum oil injection, excessive exposure time of the transformer body to air, high risk of moisture absorption of transformer body insulating components, and increased risk of transformer burnout.

Description

Technical Field

[0001] This utility model relates to the field of transformer manufacturing technology, and in particular to a transformer vacuum oil injection system. Background Technology

[0002] During the transformer production process, after the final assembly is completed, the transformer needs to undergo vacuum oil filling. The specific steps include: placing the assembled transformer in a vacuum oil filling tank, sealing the vacuum oil filling tank, first evacuating the inside of the vacuum oil filling tank and the inside of the transformer, and then filling the transformer with oil according to the required amount of oil under vacuum conditions.

[0003] However, some transformers have a large overall size, such as those used in 35kV photovoltaic power generation and energy storage systems. In these cases, a single vacuum oil filling tank can only accommodate a limited number of transformers, sometimes even just one or two. Due to limitations in site area and production costs, the number of vacuum oil filling tanks on a typical production site is small, and the number of transformers that can be vacuum-filled simultaneously is also limited. Therefore, the production cycle for vacuum oil filling is often slower than that for the final assembly process. This results in a longer waiting time between the completion of the final assembly and the vacuum oil filling, leading to excessive exposure of the transformer body to air and an increased risk of moisture absorption by the insulation components. When the transformer is running, the damp insulation components are prone to short circuits or thermal breakdowns after being energized, increasing the risk of transformer burnout. Utility Model Content

[0004] The main purpose of this utility model is to provide a transformer vacuum oil injection system. By simultaneously performing vacuum oil injection inside and outside the vacuum oil injection tank, the production cycle of vacuum oil injection is accelerated, effectively shortening the time the transformer body is exposed to air, reducing the risk of moisture absorption of insulating components, and thus reducing the risk of transformer burnout. This solves the problems of long waiting time from the completion of transformer assembly to vacuum oil injection, excessive exposure time of the transformer body to air, high risk of moisture absorption of the transformer body's insulating components, and increased risk of transformer burnout.

[0005] To achieve the above objectives, the present invention proposes a transformer vacuum oil injection system, comprising a vacuum oil injection tank, a first vacuum unit, a first transformer, an oil outlet tank, an internal oil injection unit, a second transformer, a second vacuum unit, and an external oil injection unit.

[0006] The vacuum oil filling tank is connected to the first vacuum pumping unit. The vacuum oil filling tank contains a plurality of the first transformers. The first vacuum pumping unit is used to evacuate the interior of the vacuum oil filling tank and the interior of the plurality of the first transformers. The oil outlet tank is connected to the vacuum oil filling tank through the inner oil filling unit. The inner oil filling unit is used to fill the plurality of the first transformers with oil when the oil outlet tank is in a vacuum state.

[0007] Several second transformers are arranged around the vacuum oil filling tank. The second vacuum pumping unit is connected to the first vacuum pumping unit. The tops of the several second transformers are respectively connected to the second vacuum pumping unit. The second vacuum pumping unit is used to evacuate the several second transformers.

[0008] The external oil injection unit is connected to the internal oil injection unit, and the bottoms of several second transformers are respectively connected to the external oil injection unit. The external oil injection unit is used to inject oil into several second transformers.

[0009] Optionally, the second vacuum unit includes a first air path and several second air paths; the exhaust end of the first air path is connected to the first vacuum unit, the air inlet end of the first air path is connected to the exhaust end of several second air paths, several second air paths are arranged in one-to-one correspondence with several second transformers, the air inlet end of each second air path is connected to the top of the second transformer, and the second air path is connected to the inner cavity of the second transformer.

[0010] Optionally, the second vacuum pumping unit further includes a first valve group and several second valve groups;

[0011] The first valve group is disposed in the first air passage, and the first valve group is used to control the opening and closing of the first air passage;

[0012] Each of the second gas paths is equipped with a second valve group, which is used to control the opening and closing of the second gas path.

[0013] Optionally, the first valve group includes a first valve and a second valve; the first air passage is provided with the first valve and the second valve in sequence, and the first valve is located near the exhaust end of the first air passage, and the second valve is located near the air inlet end of the first air passage;

[0014] The second valve group includes a third valve and a fourth valve; the second air passage is provided with the third valve and the fourth valve in sequence, with the third valve located near the exhaust end of the second air passage and the fourth valve located near the air inlet end of the second air passage.

[0015] Optionally, the external oil injection unit includes a first oil passage and several second oil passages; the oil inlet end of the first oil passage is connected to the internal oil injection unit, the oil outlet end of the first oil passage is connected to the oil inlet end of several second oil passages, the second oil passages are arranged in a one-to-one correspondence with the second transformer, and the oil outlet end of each second oil passage is connected to the bottom of the second transformer, and the second oil passages are connected to the inner cavity of the second transformer.

[0016] Optionally, the external oil injection unit further includes a main valve and several third valve groups;

[0017] The main valve is located in the first oil circuit and is used to control the opening and closing of the first oil circuit;

[0018] Each of the second oil passages is equipped with the third valve group, which is used to control the on / off state of the second oil passage.

[0019] Optionally, the third valve group includes a fifth valve, a sixth valve, and a seventh valve; the second oil circuit is sequentially provided with the fifth valve, the sixth valve, and the seventh valve, the fifth valve being located near the oil inlet end of the second oil circuit, the seventh valve being located near the oil outlet end of the second oil circuit, and the sixth valve being located between the fifth valve and the seventh valve;

[0020] The external oil injection unit also includes several first flow meters. Each of the second oil lines is equipped with a first flow meter. The first flow meter is used to monitor the oil injection flow of the second transformer and is located between the sixth valve and the seventh valve.

[0021] Optionally, the first vacuum pumping unit includes a first vacuum pipeline, a first vacuum pump assembly, and an eighth valve;

[0022] The inlet end of the first vacuum pipeline is connected to the vacuum oil filling tank, and the first vacuum pipeline is connected to the inner cavity of the vacuum oil filling tank and the inner cavity of the first transformer. The exhaust end of the first vacuum pipeline is connected to the inlet end of the first vacuum pump group. The eighth valve is located in the first vacuum pipeline, and the exhaust end of the first gas path is connected to the first vacuum pipeline. The exhaust end of the first gas path is located on the side of the eighth valve near the vacuum oil filling tank.

[0023] Optionally, the internal oil injection unit includes an oil injection pipeline, a ninth valve, a heater, a tenth valve, and a second flow meter;

[0024] The oil inlet of the oil injection pipeline is connected to the oil outlet tank, and the oil outlet of the oil injection pipeline is connected to the vacuum oil injection tank; the oil injection pipeline is provided with the ninth valve, the heater, the tenth valve and the second flow meter in sequence from its oil inlet to its oil outlet.

[0025] The second flow meter is used to monitor the oil injection flow rate of the vacuum oil injection tank; the oil inlet end of the first oil circuit is connected to the oil injection pipeline, and the oil inlet end of the first oil circuit is located on the side of the heater near the tenth valve.

[0026] Optionally, the transformer vacuum oil injection system further includes a third vacuum unit, which is connected to the oil outlet tank and is used to extract the gas in the oil outlet tank so that the inside of the oil outlet tank is in a vacuum state.

[0027] Compared with the prior art, the embodiments of this utility model have the following beneficial effects:

[0028] In this transformer vacuum oil injection system, a first transformer is placed inside a vacuum oil injection tank. A first vacuum unit then evacuates several first transformers. This method eliminates the need for a separate vacuum pipeline for each first transformer, reducing the number of pipelines and simplifying the piping system. An internal oil injection unit injects oil into several first transformers. Several second transformers are located around the vacuum oil injection tank. A second vacuum unit connects to the first vacuum unit, and the tops of several second transformers are connected to the second vacuum unit, thus evacuating several second transformers. An external oil injection unit connects to the internal oil injection unit, and the bottoms of several second transformers are connected to the external oil injection unit, thus injecting oil into several second transformers. Therefore, this transformer vacuum oil injection system, by simultaneously performing vacuum oil injection on multiple transformers inside and outside the vacuum oil injection tank, accelerates the production cycle of vacuum oil injection, shortens the waiting time from the completion of transformer assembly to vacuum oil injection, effectively reduces the time the transformer body is exposed to air, reduces the risk of moisture absorption of insulation components, and consequently reduces the risk of transformer burnout. Furthermore, this transformer vacuum oil injection system, while ensuring the quality of transformer products, does not require an additional number of vacuum oil injection tanks. Within the existing site area, by combining the first vacuum unit, the internal oil injection unit, the second vacuum unit, and the external oil injection unit, it can accelerate the production cycle of the vacuum oil injection process and has the advantage of low production cost. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of a transformer vacuum oil injection system according to an embodiment of the present invention;

[0030] Figure 2 This is a schematic diagram of the structure of a transformer vacuum oil injection system according to another embodiment of the present invention.

[0031] In the attached diagram: 1. Vacuum oil filling tank; 2. First vacuum pumping unit; 21. First vacuum pipeline; 22. First vacuum pump group; 23. Eighth valve; 3. First transformer; 4. Oil outlet tank; 5. Internal oil filling unit; 51. Oil filling pipeline; 52. Ninth valve; 53. Heater; 54. Tenth valve; 55. Second flow meter; 6. Second transformer; 7. Second vacuum pumping unit; 71. First gas path; 72. Second gas path; 73. First valve group; 74. 1. First valve; 732. Second valve; 74. Second valve group; 741. Third valve; 742. Fourth valve; 8. External oil injection unit; 81. First oil circuit; 82. Second oil circuit; 83. Main valve; 84. Third valve group; 841. Fifth valve; 842. Sixth valve; 843. Seventh valve; 85. First flow meter; 9. Third vacuum unit; 91. Second vacuum pipeline; 92. Second vacuum pump group; 93. Eleventh valve. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0034] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0035] Furthermore, in this utility model, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the word "and / or" throughout the text means including three parallel solutions; taking "A and / or B" as an example, it includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0036] This utility model proposes a transformer vacuum oil injection system.

[0037] In the embodiments of this utility model, such as Figure 1 As shown, the transformer vacuum oil injection system includes a vacuum oil injection tank 1, a first vacuum unit 2, a first transformer 3, an oil outlet tank 4, an internal oil injection unit 5, a second transformer 6, a second vacuum unit 7, and an external oil injection unit 8.

[0038] Vacuum oil filling tank 1 is connected to the first vacuum pumping unit 2. Several first transformers 3 are installed inside the vacuum oil filling tank 1. The first vacuum pumping unit 2 is used to evacuate the inside of the vacuum oil filling tank 1 and the inside of the several first transformers 3. Oil outlet tank 4 is connected to the vacuum oil filling tank 1 through an internal oil filling unit 5. The internal oil filling unit 5 is used to fill the several first transformers 3 with oil when the oil outlet tank 4 is in a vacuum state.

[0039] Several second transformers 6 are arranged around the vacuum oil filling tank 1. The second vacuum pumping unit 7 is connected to the first vacuum pumping unit 2. The tops of the several second transformers 6 are respectively connected to the second vacuum pumping unit 7. The second vacuum pumping unit 7 is used to evacuate the several second transformers 6.

[0040] The external oil injection unit 8 is connected to the internal oil injection unit 5, and the bottoms of several second transformers 6 are respectively connected to the external oil injection unit 8. The external oil injection unit 8 is used to inject oil into several second transformers 6.

[0041] In this transformer vacuum oil injection system, the first transformer 3 is placed inside the vacuum oil injection tank 1, and then the first vacuum unit 2 is used to vacuum several first transformers 3. This vacuuming method eliminates the need for a separate vacuum pipeline for each first transformer 3, reducing the number of vacuum pipelines and simplifying the pipeline system. An inner oil injection unit 5 is used to inject oil into several first transformers 3. Several second transformers 6 are located around the vacuum oil injection tank 1. A second vacuum unit 7 is connected to the first vacuum unit 2, and the tops of several second transformers 6 are also connected to the second vacuum unit 7, thus achieving vacuuming of several second transformers 6. An outer oil injection unit 8 is connected to the inner oil injection unit 5, and the bottoms of several second transformers 6 are also connected to the outer oil injection unit 8, thus achieving oil injection into several second transformers 6. Therefore, this transformer vacuum oil injection system accelerates the production cycle of vacuum oil injection by simultaneously performing vacuum oil injection on multiple transformers inside and outside the vacuum oil injection tank 1. This shortens the waiting time from the completion of the transformer assembly to the vacuum oil injection process, effectively reducing the time the transformer body is exposed to air, lowering the risk of moisture damage to the insulation components, and thus reducing the risk of transformer burnout. Furthermore, this transformer vacuum oil injection system, while ensuring transformer product quality, does not require additional vacuum oil injection tanks 1. Within existing site conditions, by combining the first vacuum unit 2, the inner oil injection unit 5, the second vacuum unit 7, and the outer oil injection unit 8, it accelerates the production cycle of the vacuum oil injection process and has the advantage of low production cost.

[0042] This invention solves the problems of long waiting time between the completion of transformer assembly and vacuuming and oil injection, excessive exposure time of the transformer body to air, high risk of moisture damage to the transformer body insulation components, and increased risk of transformer burnout.

[0043] It should be noted that in this transformer vacuum oil filling system, "first transformer 3" and "second transformer 6" are only used to distinguish between the transformer located inside the vacuum oil filling tank 1 and the transformer located outside the vacuum oil filling tank 1. In reality, first transformer 3 and second transformer 6 can be the same transformer product or different transformer products. For example, both first transformer 3 and second transformer 6 are oil-immersed transformers.

[0044] like Figure 1 As shown, in one embodiment of this application, the second vacuuming unit 7 includes a first air passage 71 and a plurality of second air passages 72; the exhaust end of the first air passage 71 is connected to the first vacuuming unit 2, the air inlet end of the first air passage 71 is connected to the exhaust end of the plurality of second air passages 72, the plurality of second air passages 72 are arranged in a one-to-one correspondence with a plurality of second transformers 6, the air inlet end of each second air passage 72 is connected to the top of the second transformer 6, and the second air passage 72 is connected to the inner cavity of the second transformer 6.

[0045] The second vacuuming unit 7 includes a first air passage 71 and several second air passages 72. By connecting the exhaust end of the first air passage 71 to the first vacuuming unit 2 and the inlet end of the first air passage 71 to the exhaust ends of several second transformers 6, the second transformers 6 are vacuumed from the top. The gas inside the second transformer 6 enters the second air passages 72 and the first air passages 71 in sequence, then enters the first vacuuming unit 2 and is discharged, thus achieving the vacuuming of the second transformer 6.

[0046] like Figure 1 As shown, in one embodiment of this application, the second vacuum unit 7 further includes a first valve group 73 and a plurality of second valve groups 74;

[0047] The first valve group 73 is disposed in the first air passage 71, and the first valve group 73 is used to control the opening and closing of the first air passage 71.

[0048] Each second air passage 72 is equipped with a second valve group 74, which is used to control the opening and closing of the second air passage 72.

[0049] The first gas path 71 serves as the main pipeline of the second vacuum pumping unit 7, and several second gas paths 72 serve as branch pipelines of the second vacuum pumping unit 7. By installing a first valve group 73 in the first gas path 71 and a second valve group 74 in the second gas paths 72, in an emergency, closing the first valve group 73 can quickly cut off the first gas path 71, thus de-connecting the second vacuum pumping unit 7 to the first vacuum pumping unit 2; closing the second valve group 74 can quickly cut off the second gas path 72, de-connecting the second gas path 72 to the second transformer 6. Therefore, the installation of the first valve group 73 and the second valve group 74 can protect the vacuum pumping and oil injection system of this transformer, further extending its service life.

[0050] like Figure 1 As shown, in one embodiment of this application, the first valve group 73 includes a first valve 731 and a second valve 732; the first air passage 71 is provided with the first valve 731 and the second valve 732 in sequence, and the first valve 731 is located near the exhaust end of the first air passage 71, and the second valve 732 is located near the air inlet end of the first air passage 71.

[0051] The second valve group 74 includes a third valve 741 and a fourth valve 742; the second air passage 72 is provided with the third valve 741 and the fourth valve 742 in sequence, with the third valve 741 located near the exhaust end of the second air passage 72 and the fourth valve 742 located near the air inlet end of the second air passage 72.

[0052] By setting a first valve 731 and a second valve 732 in the first gas path 71, and a third valve 741 and a fourth valve 742 in the second gas path 72, the first gas path 71 and the second gas path 72 can be controlled and maintained in segments, which can further optimize the vacuuming efficiency.

[0053] To further explain, before evacuating several second transformers 6, it is necessary to open the first valve 731, the second valve 732, the third valve 741, and the fourth valve 742, so that the first valve 731, the second valve 732, the third valve 741, and the fourth valve 742 are in the open state.

[0054] Preferably, the first valve 731 is a manual ball valve, the second valve 732 is an electric vacuum valve, the third valve 741 is a vacuum four-way ball valve, and the fourth valve 742 is a manual ball valve.

[0055] like Figure 1 As shown, in one embodiment of this application, the external oil injection unit 8 includes a first oil passage 81 and a plurality of second oil passages 82; the oil inlet end of the first oil passage 81 is connected to the internal oil injection unit 5, the oil outlet end of the first oil passage 81 is connected to the oil inlet end of the plurality of second oil passages 82, the second oil passages 82 are arranged one-to-one with the second transformer 6, and the oil outlet end of each second oil passage 82 is connected to the bottom of the second transformer 6, and the second oil passages 82 are connected to the inner cavity of the second transformer 6.

[0056] The external oil injection unit 8 includes a first oil passage 81 and several second oil passages 82. By connecting the oil inlet end of the first oil passage 81 to the internal oil injection unit 5 and connecting the oil outlet end of the first oil passage 81 to the oil inlet end of several second oil passages 82, the second transformer 6 is injected with oil from the bottom. The oil in the oil tank 4 enters the internal oil injection unit 5 from the oil outlet, then enters the first oil passage 81 and the second oil passage 82 in sequence, and finally enters the second transformer 6, thus realizing the oil injection of the second transformer 6.

[0057] like Figure 1 As shown, in one embodiment of this application, the external oil injection unit 8 further includes a main valve 83 and a plurality of third valve groups 84;

[0058] The main valve 83 is located in the first oil circuit 81 and is used to control the opening and closing of the first oil circuit 81.

[0059] Each second oil passage 82 is equipped with a third valve group 84, which is used to control the opening and closing of the second oil passage 82.

[0060] The first oil circuit 81 serves as the main pipeline of the external oil injection unit 8, and several second oil circuits 82 serve as branch pipelines of the external oil injection unit 8. By setting a main valve 83 in the first oil circuit 81, opening the main valve 83 allows oil from the internal oil injection unit 5 to enter the second oil circuit 82, initiating oil injection. When the required oil volume for the second transformer 6 is reached, or in case of an emergency, the main valve 83 is closed to stop oil injection. By setting a third valve group 84 in the second oil circuit 82 to control the opening and closing of the second oil circuit 82, the vacuum oil injection system of this transformer can be protected, further extending the service life of the vacuum oil injection system of this transformer.

[0061] like Figure 1 As shown, in one embodiment of this application, the third valve group 84 includes a fifth valve 841, a sixth valve 842, and a seventh valve 843; the second oil passage 82 is sequentially provided with the fifth valve 841, the sixth valve 842, and the seventh valve 843, the fifth valve 841 is located near the oil inlet end of the second oil passage 82, the seventh valve 843 is located near the oil outlet end of the second oil passage 82, and the sixth valve 842 is located between the fifth valve 841 and the seventh valve 843;

[0062] The external oil injection unit 8 also includes several first flow meters 85. Each second oil circuit 82 is equipped with a first flow meter 85. The first flow meter 85 is used to monitor the oil injection flow of the second transformer 6, and the first flow meter 85 is located between the sixth valve 842 and the seventh valve 843.

[0063] The fifth valve 841, the sixth valve 842 and the seventh valve 843 can be set to control and maintain the second oil circuit 82 in sections. The flow meter can be used to provide real-time feedback on the actual oil injection flow into the second transformer 6, which can further optimize the oil injection efficiency of the second oil circuit 82.

[0064] To further explain, before filling several second transformers 6 with oil, the main valve 83, the fifth valve 841, the sixth valve 842, and the seventh valve 843 need to be opened so that the main valve 83, the fifth valve 841, the sixth valve 842, and the seventh valve 843 are in the open state.

[0065] Preferably, the fifth valve 841 is a manual four-way valve, the sixth valve 842 is a pneumatic ball valve, and the seventh valve 843 is a manual ball valve.

[0066] like Figure 1 As shown, in one embodiment of this application, the first vacuum pumping unit 2 includes a first vacuum pipeline 21, a first vacuum pump group 22, and an eighth valve 23;

[0067] The inlet end of the first vacuum line 21 is connected to the vacuum oil tank 1, and the first vacuum line 21 is connected to the inner cavity of the vacuum oil tank 1 and the inner cavity of the first transformer 3. The outlet end of the first vacuum line 21 is connected to the inlet end of the first vacuum pump group 22. The eighth valve 23 is located on the first vacuum line 21. The outlet end of the first gas passage 71 is connected to the first vacuum line 21. The outlet end of the first gas passage 71 is located on the side of the eighth valve 23 near the vacuum oil tank 1.

[0068] By connecting the exhaust end of the first gas path 71 to the first vacuum line 21, and combining the first vacuum line 21, the first vacuum pump group 22, and the eighth valve 23, the vacuum oil filling tank 1 and several second transformers 6 are evacuated. The exhaust end of the first gas path 71 is located on the side of the eighth valve 23 near the vacuum oil filling tank 1. Thus, by controlling the eighth valve 23, it is more convenient to control the start or end of the evacuation of the entire system.

[0069] Preferably, the eighth valve 23 is an electric butterfly valve, and the ninth valve 52 is a pneumatic ball valve.

[0070] like Figure 1 As shown, in one embodiment of this application, the internal oil injection unit 5 includes an oil injection pipeline 51, a ninth valve 52, a heater 53, a tenth valve 54, and a second flow meter 55;

[0071] The oil inlet end of the oil filling pipeline 51 is connected to the oil outlet tank 4, and the oil outlet end of the oil filling pipeline 51 is connected to the vacuum oil filling tank 1; the oil filling pipeline 51 is provided with a ninth valve 52, a heater 53, a tenth valve 54 and a second flow meter 55 in sequence from its oil inlet end to its oil outlet end.

[0072] The second flow meter 55 is used to monitor the oil injection flow rate of the vacuum oil injection tank 1; the oil inlet of the first oil passage 81 is connected to the oil injection pipeline 51, and the oil inlet of the first oil passage 81 is located on the side of the heater 53 near the tenth valve 54.

[0073] By connecting the oil inlet of the first oil passage 81 to the oil injection pipeline 51, and combining the ninth valve 52, heater 53, tenth valve 54 and second flow meter 55, the oil from the oil tank 4 is heated by the heater 53 and enters the first transformer 3 of the vacuum oil injection tank 1 through the oil injection pipeline 51, and enters the second transformer 6 through the first oil passage 81 and the second oil passage 82, thus realizing the oil injection of the first transformer 3 and the second transformer 6. Moreover, the actual oil injection flow of the vacuum oil injection tank 1 can be fed back in real time, and the amount of oil required by the transformer can be accurately controlled.

[0074] Preferably, the tenth valve 54 is a pneumatic ball valve.

[0075] To further explain, the vacuum oil filling tank 1 is provided with several internal oil filling branches (not shown in the figure). The oil inlet end of the several internal oil filling branches is connected to the oil outlet end of the oil filling pipeline 51. The internal oil filling branches are set one-to-one with the first transformer 3, and the oil outlet end of the internal oil filling branch is connected to the inner cavity of the first transformer 3.

[0076] To further clarify, in this transformer vacuum oil filling system, it's not necessarily better to have more second transformers 6. If there are too many second transformers 6, the flow rate of the oil filling pipeline 51 will not be able to meet the simultaneous oil filling needs of these second transformers 6. This is because the oil filling flow rate is limited by the maximum flow rate of the oil pump (generally used to pump transformer oil from the outlet tank 4). Generally, the transformers closer to the outlet of the outlet tank 4 have a larger oil filling flow rate and are filled first, while those farther away have a smaller oil filling flow rate. Only after the transformers closer to the outlet of the outlet tank 4 have finished filling will the oil filling flow rate of the transformers farther away increase. Therefore, the number of second transformers 6 needs to be set according to the actual situation.

[0077] like Figure 1 As shown, in a preferred embodiment of this utility model, two first transformers 3 and three second transformers 6 are provided. This is based on a comprehensive consideration of factors such as the production cycle of the final assembly process, the production cycle of vacuuming and oil injection, the site conditions, and avoiding excessively long pipelines.

[0078] like Figure 2 As shown, in one embodiment of this application, the transformer vacuum oil injection system further includes a third vacuum unit 9, which is connected to the oil outlet tank 4 and is used to extract the gas in the oil outlet tank 4 so that the inside of the oil outlet tank 4 is in a vacuum state.

[0079] By setting up a third vacuum unit 9, the inside of the oil tank 4 is kept in a vacuum state, which prevents the oil from contacting air and causing oxidation. It also prevents residual air bubbles in the oil, further ensuring the quality of the transformer product.

[0080] In one embodiment of the present invention, the third vacuum pumping unit 9 includes a second vacuum pipeline 91, a second vacuum pump group 92, and an eleventh valve 93; the pumping end and the exhaust end of the second vacuum pipeline 91 are respectively connected to the oil tank 4 and the inlet end of the second vacuum pump group 92; the eleventh valve 93 is disposed on the second vacuum pipeline 91 and is used to control the opening and closing of the second vacuum pipeline 91.

[0081] Preferably, the eleventh valve 93 is an electric butterfly valve.

[0082] In another embodiment of this utility model, the third vacuum pumping unit 9 can be replaced with the first vacuum pumping unit 2.

[0083] Combination Figure 2 The actual usage process of one embodiment of this utility model is as follows:

[0084] (1) Preparation for operation: Place the two first transformers 3 that need to be vacuumed and injected with oil in the vacuum oil injection tank 1, and place the three second transformers 6 (the first transformers 3 and the second transformers 6 are the same product) within 10 meters of the vacuum oil injection tank 1.

[0085] Connect the first vacuum line 21 to the vacuum oil filling tank 1 and the first vacuum pump group 22;

[0086] Connect the oil injection pipeline 51 to the oil outlet tank 4 and the vacuum oil injection tank 1;

[0087] Connect the second vacuum line 91 to the oil tank 4 and the second vacuum pump group 92;

[0088] Connect the first vacuum line 21, the first gas line 71, the three second gas lines 72 and the three second transformers 6;

[0089] Connect the oil injection line 51, the first oil line 81, the three second oil lines 82 and the three second transformers 6.

[0090] Set the evacuation stop value of the vacuum oil filling tank 1 to 500Pa and the start value to 700Pa; set the closing value of the second valve 732 to -60kPa and the opening value to -55kPa, then close the tank door of the vacuum oil filling tank 1 and set the required oil filling volume for the first transformer 3 and the second transformer 6.

[0091] (2) Operation Procedure: Start the automatic operation program, and sequentially open the first valve 731, the second valve 732, the third valve 741, and the fourth valve 742, as well as the eighth valve 23, to begin evacuating the interior of the vacuum oil filling tank 1, the two first transformers 3, and the three second transformers 6. Observe the changes in the vacuum gauge readings on the vacuum oil filling tank 1 and the second transformers 6. When the vacuum level of the first gas passage 71 reaches -60 kPa, close the first valve 731 and the second valve 732, and continue evacuating the interior of the vacuum oil filling tank 1. The vacuum inside the first transformers 3 and the second transformers 6 needs to be maintained for 1 hour before oil filling (depending on the actual process requirements).

[0092] Open valves 52 (ninth) and 54 (tenth) to fill oil into the first transformer 3. Open valves 83 (main), 841 (fifth), 842 (sixth), and 843 (seventh) to fill oil into the second transformer 6. During the oil filling process, maintain a vacuum of approximately -60 kPa to -50 kPa. Once the set oil filling volume is reached, close valve 52 to end the oil filling process. After oil filling is complete, sequentially close valves 843 (seventh), 842 (sixth), 841 (fifth), and 83 (main) of the external oil filling unit 8; close valve 54 (tenth) of the internal oil filling unit 5; then sequentially close valves 742 (fourth), 741 (third), 732 (second), and 731 (first) of the second vacuum unit 7; valve 23 (eighth) of the first vacuum unit 2; and finally, close valve 93 (eleventh) of the third vacuum unit 9. Then, open the vacuum oil filling tank 1, take out the first transformer 3, and test the first transformer 3 after it has been left to stand under normal pressure for 24 hours. The second transformer 6 is then tested after it has been left to stand under a vacuum of about -60 kPa for 24 hours.

[0093] The technical principles of this utility model have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of this utility model and should not be construed as limiting the scope of protection of this utility model in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of this utility model without any inventive effort, and these embodiments will all fall within the scope of protection of this utility model.

Claims

1. A transformer vacuum oil filling system, characterized by, It includes a vacuum oil injection tank, a first vacuum pumping unit, a first transformer, an oil outlet tank, an internal oil injection unit, a second transformer, a second vacuum pumping unit, and an external oil injection unit; The vacuum oil filling tank is connected to the first vacuum pumping unit. The vacuum oil filling tank contains a plurality of the first transformers. The first vacuum pumping unit is used to evacuate the interior of the vacuum oil filling tank and the interior of the plurality of the first transformers. The oil outlet tank is connected to the vacuum oil filling tank through the inner oil filling unit. The inner oil filling unit is used to fill the plurality of the first transformers with oil when the oil outlet tank is in a vacuum state. Several second transformers are arranged around the vacuum oil filling tank. The second vacuum pumping unit is connected to the first vacuum pumping unit. The tops of the several second transformers are respectively connected to the second vacuum pumping unit. The second vacuum pumping unit is used to evacuate the several second transformers. The external oil injection unit is connected to the internal oil injection unit, and the bottoms of several second transformers are respectively connected to the external oil injection unit. The external oil injection unit is used to inject oil into several second transformers.

2. The transformer vacuum oil filling system of claim 1, wherein, The second vacuum pumping unit includes a first air path and several second air paths; the exhaust end of the first air path is connected to the first vacuum pumping unit, the air inlet end of the first air path is connected to the exhaust end of several second air paths, several second air paths are arranged one-to-one with several second transformers, the air inlet end of each second air path is connected to the top of the second transformer, and the second air path is connected to the inner cavity of the second transformer.

3. The transformer vacuum oil filling system of claim 2, wherein, The second vacuum pumping unit also includes a first valve group and several second valve groups; The first valve group is disposed in the first air passage, and the first valve group is used to control the opening and closing of the first air passage; Each of the second gas paths is equipped with a second valve group, which is used to control the opening and closing of the second gas path.

4. The transformer vacuum oil filling system of claim 3, wherein, The first valve group includes a first valve and a second valve; the first air passage is provided with the first valve and the second valve in sequence, and the first valve is located near the exhaust end of the first air passage, and the second valve is located near the air inlet end of the first air passage; The second valve group includes a third valve and a fourth valve; the second air passage is provided with the third valve and the fourth valve in sequence, with the third valve located near the exhaust end of the second air passage and the fourth valve located near the air inlet end of the second air passage.

5. The transformer vacuum oil filling system of claim 1, wherein, The external oil injection unit includes a first oil passage and several second oil passages; the oil inlet end of the first oil passage is connected to the internal oil injection unit, the oil outlet end of the first oil passage is connected to the oil inlet end of several second oil passages, the second oil passages are arranged one-to-one with the second transformer, and the oil outlet end of each second oil passage is connected to the bottom of the second transformer, and the second oil passages are connected to the inner cavity of the second transformer.

6. The transformer vacuum oil filling system of claim 5, wherein, The external oil injection unit also includes a main valve and several third valve groups; The main valve is located in the first oil circuit and is used to control the opening and closing of the first oil circuit; Each of the second oil passages is equipped with the third valve group, which is used to control the on / off state of the second oil passage.

7. The transformer vacuum oil filling system of claim 6, wherein, The third valve group includes a fifth valve, a sixth valve, and a seventh valve; the second oil circuit is sequentially provided with the fifth valve, the sixth valve, and the seventh valve, with the fifth valve located near the oil inlet of the second oil circuit, the seventh valve located near the oil outlet of the second oil circuit, and the sixth valve located between the fifth valve and the seventh valve; The external oil injection unit also includes several first flow meters. Each of the second oil lines is equipped with a first flow meter. The first flow meter is used to monitor the oil injection flow of the second transformer and is located between the sixth valve and the seventh valve.

8. The transformer vacuum oil filling system of claim 2, wherein, The first vacuum pumping unit includes a first vacuum pipeline, a first vacuum pump assembly, and an eighth valve; The inlet end of the first vacuum pipeline is connected to the vacuum oil filling tank, and the first vacuum pipeline is connected to the inner cavity of the vacuum oil filling tank and the inner cavity of the first transformer. The exhaust end of the first vacuum pipeline is connected to the inlet end of the first vacuum pump group. The eighth valve is located in the first vacuum pipeline, and the exhaust end of the first gas path is connected to the first vacuum pipeline. The exhaust end of the first gas path is located on the side of the eighth valve near the vacuum oil filling tank.

9. The transformer vacuum oil filling system of claim 8, wherein, The internal oil injection unit includes an oil injection pipeline, a ninth valve, a heater, a tenth valve, and a second flow meter; The oil inlet of the oil injection pipeline is connected to the oil outlet tank, and the oil outlet of the oil injection pipeline is connected to the vacuum oil injection tank; the oil injection pipeline is provided with the ninth valve, the heater, the tenth valve and the second flow meter in sequence from its oil inlet to its oil outlet. The second flow meter is used to monitor the oil injection flow rate of the vacuum oil injection tank; the oil inlet end of the first oil circuit is connected to the oil injection pipeline, and the oil inlet end of the first oil circuit is located on the side of the heater near the tenth valve.

10. The transformer vacuum oil filling system of claim 1, wherein, The transformer vacuum oil injection system also includes a third vacuum unit, which is connected to the oil outlet tank and is used to extract the gas in the oil outlet tank so that the inside of the oil outlet tank is in a vacuum state.

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