Transformer oil extraction method and device based on oil chromatography monitoring device

Abstract

The invention provides a transformer oil extraction method and device based on an oil chromatography monitoring device. The oil extraction method of the transformer based on the oil chromatography monitoring device comprises the following steps: S1, disconnecting the oil extraction pipe in the oil chromatography online monitoring cabinet, and respectively connecting two disconnected pipe sections of the oil extraction pipe with a first communication port and a second communication port of a three-way valve; s2, an oil inlet of an oil outlet pipe is connected with a third communication port of the three-way valve, and a check valve is arranged on the oil outlet pipe; s3, an oil outlet hose is installed on an oil outlet of the oil outlet pipe; and S4, the three-way valve is controlled so that oil can be extracted from the transformer body through one part of the oil extraction pipe, the three-way valve, the oil outlet pipe and the oil outlet hose. Therefore, the oil extraction method of the transformer based on the oil chromatography monitoring device has the advantage of convenience in oil extraction.

Description

Technical Field

[0001] The invention relates to the technical field of transformers, and in particular to a transformer oil extraction method and device based on an oil chromatography monitoring device. Background Art

[0002] In the related art, the sampling valve of large transformers is designed and installed at the factory, and is mostly installed at the bottom of the transformer. Due to different installation methods, the ground clearance of the sampling valve is different, which makes it difficult to collect leaking oil during the sampling process. In addition, the sampling environment is unobstructed, and the ventilation and cooling systems are prone to dust, causing oil sample contamination. The oil sampling of large transformers is done by putting a silicone and rubber sampling tube on a threaded sampling valve. The silicone and rubber sampling tubes are elastic, and manual connection is difficult. If there is oil on the sampling valve or sampling tube, the sampling tube connection is easy to fall off, and the oil sample is easy to spray onto the ground and the clothes of the sampling personnel during the sampling process. The sampling of large transformer oil is relatively frequent, and waste oil or spraying will be generated after sampling. The management process of waste oil is complicated, and spraying is easy to pollute the environment. In addition, the sampling valve is prone to deformation and oil leakage after long-term use, and it is extremely inconvenient to replace. Summary of the invention

[0003] The present invention aims to solve one of the technical problems in the related art at least to a certain extent. To this end, an embodiment of the present invention provides a transformer oil extraction method and device based on an oil chromatography monitoring device.

[0004] The transformer oil extraction method based on the oil chromatogram monitoring device of the embodiment of the present invention comprises a transformer body and an oil chromatogram online monitoring cabinet, the transformer body has a No. 1 oil extraction port, the oil extraction device in the oil chromatogram online monitoring cabinet is connected to the No. 1 oil extraction port through an oil extraction pipe, and the transformer oil extraction method based on the oil chromatogram monitoring device comprises the following steps:

[0005] S1, disconnecting the oil extraction pipe in the oil chromatogram online monitoring cabinet, and connecting the two disconnected pipe sections of the oil extraction pipe to the first connecting port and the second connecting port of the three-way valve respectively;

[0006] S2, connecting the oil inlet of the oil outlet pipe to the third connecting port of the three-way valve, wherein the oil outlet pipe is provided with a check valve;

[0007] S3, installing an oil outlet hose on the oil outlet of the oil outlet pipe;

[0008] S4. Controlling the three-way valve so as to take oil from the transformer body through a portion of the oil taking pipe, the three-way valve, the oil outlet pipe and the oil outlet hose.

[0009] Therefore, the transformer oil extraction method based on the oil chromatography monitoring device according to the embodiment of the present invention has the advantage of being easy to extract oil.

[0010] In some embodiments, in step S1,

[0011] The first communication port is a lower opening of the three-way valve, and the second communication port is an upper opening of the three-way valve;

[0012] The oil extraction pipe is disconnected into a first pipe section and a second pipe section, the oil inlet of the first pipe section is connected to the No. 1 oil extraction port, the oil outlet of the first pipe section faces upward and is connected to the first connecting port, the oil inlet of the second pipe section faces downward and is connected to the second connecting port, and the oil outlet of the second pipe section is connected to the oil extraction device of the oil chromatogram online monitoring cabinet.

[0013] In some embodiments, in step S2,

[0014] The third communication port is a side opening of the three-way valve;

[0015] A storage box is arranged in the oil chromatogram online monitoring cabinet. Before taking oil, the oil outlet hose is installed on the oil outlet of the oil outlet pipe. After taking oil, the oil outlet hose is placed in the storage box.

[0016] In some embodiments, in step S4, the three-way valve is controlled so that the first pipe section of the oil extraction pipe is connected to the oil outlet pipe, so that oil can be extracted from the transformer body through the first pipe section, the three-way valve, the oil outlet pipe and the oil outlet hose.

[0017] In some embodiments, in step S4, the three-way valve can control the flow rate of the fluid entering the second pipe section and the oil outlet pipe.

[0018] The present invention also provides a transformer, comprising

[0019] A transformer body, wherein the transformer body has a No. 1 oil inlet, a No. 2 oil return inlet, and a transformer body oil inlet, wherein the No. 2 oil return inlet is located above the No. 1 oil inlet, the transformer body oil inlet is located at the bottom of the transformer body, and the transformer body oil inlet is located below the No. 1 oil inlet;

[0020] An oil chromatogram online monitoring cabinet, wherein the oil chromatogram online monitoring cabinet is provided with an oil extraction device;

[0021] An oil extraction pipe, the oil extraction pipe comprising a first pipe section and a second pipe section, the oil inlet of the first pipe section is connected to the first oil extraction port, the oil outlet of the first pipe section is connected to the first connecting port of the three-way valve, the oil inlet of the second pipe section is connected to the second connecting port of the three-way valve, and the oil outlet of the second pipe section is connected to the oil inlet of the oil extraction device;

[0022] An oil return pipe, wherein the oil inlet of the oil return pipe is connected to the oil extraction device, and the oil outlet of the oil return pipe is connected to the second oil return port;

[0023] An oil outlet pipe, the oil inlet of the oil outlet pipe is connected to the third connecting port of the three-way valve, and a check valve is provided on the oil outlet pipe.

[0024] In some embodiments, an oil outlet hose is provided on the oil outlet of the oil outlet pipe.

[0025] In some embodiments, the oil outlet of the first pipe segment faces upward, the first communication port faces downward, the oil inlet of the second pipe segment faces downward, and the second communication port faces upward.

[0026] In some embodiments, a storage box for placing the oil outlet hose is provided in the oil chromatography online monitoring cabinet.

[0027] In some embodiments, the distance between the three-way valve and the bottom of the oil chromatogram online monitoring cabinet is greater than or equal to 20 cm;

[0028] The three-way valve can adjust the flow rate of the fluid discharged from the second communication port and the third communication port;

[0029] The first pipe section, the oil return pipe and the oil outlet pipe are all provided with opening and closing valves. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a schematic diagram of a transformer according to an embodiment of the present invention.

[0031] Reference numerals:

[0032] 1. Transformer body, 11. No. 1 oil inlet, 12. No. 2 oil return inlet, 13. Transformer body oil inlet;

[0033] 2. Oil chromatography online monitoring cabinet;

[0034] 3. Take the oil pipe, 31, the first pipe section, 32, the second pipe section;

[0035] 4. Oil return pipe, 41. Opening and closing valve;

[0036] 5. Oil outlet pipe, 51. Check valve, 52. Oil outlet hose;

[0037] 6. Three-way valve, 61. First communication port, 62. Second communication port, 63. Third communication port. DETAILED DESCRIPTION

[0038] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0039] The following describes the oil extraction method of the transformer based on the oil chromatography monitoring device according to the embodiment of the present invention with reference to the accompanying drawings. Figure 1 As shown, the present invention also proposes an oil extraction device for a transformer based on an oil chromatography monitoring device. The following specifically describes the oil extraction method for a transformer based on an oil chromatography monitoring device according to an embodiment of the present invention in combination with the oil extraction device for a transformer based on an oil chromatography monitoring device according to an embodiment of the present invention.

[0040] The transformer includes a transformer body 1 and an oil chromatogram online monitoring cabinet 2. The transformer body 1 has a No. 1 oil extraction port 11. The oil extraction device in the oil chromatogram online monitoring cabinet 2 is connected to the No. 1 oil extraction port 11 through an oil extraction pipe 3. The transformer oil extraction method based on the oil chromatogram monitoring device according to an embodiment of the present invention includes the following steps:

[0041] S1. Disconnect the oil extraction pipe 3 located in the oil chromatogram online monitoring cabinet 2, and connect the two disconnected pipe sections of the oil extraction pipe 3 to the first connecting port 61 and the second connecting port 62 of the three-way valve 6 respectively. In step S1, the first connecting port 61 is the lower opening of the three-way valve 6, and the second connecting port 62 is the upper opening of the three-way valve 6. The oil extraction pipe 3 is disconnected into the first pipe section 31 and the second pipe section 32, the oil outlet of the first pipe section 31 faces the upper side, the first connecting port 61 faces the lower side, the oil inlet of the second pipe section 32 faces the lower side, and the second connecting port 62 faces the upper side. The oil inlet of the first pipe section 31 is connected with the No. 1 oil extraction port 11, the oil outlet of the first pipe section 31 faces the upper side and is connected to the first connecting port 61, the oil inlet of the second pipe section 32 faces the lower side and is connected to the second connecting port 62, and the oil outlet of the second pipe section 32 is connected to the oil extraction device of the oil chromatogram online monitoring cabinet 2.

[0042] S2, connecting the oil inlet of the oil outlet pipe 5 to the third communication port 63 of the three-way valve 6, and the check valve 51 is provided on the oil outlet pipe 5. Specifically, the third communication port 63 is a side opening of the three-way valve 6.

[0043] S3, installing the oil outlet hose 52 on the oil outlet of the oil outlet pipe 5.

[0044] S4. The three-way valve 6 is controlled so as to take oil from the transformer body 1 through a part of the oil taking pipe 3, the three-way valve 6, the oil outlet pipe 5 and the oil outlet hose 52.

[0045] According to the transformer oil extraction method based on the oil chromatogram monitoring device of the embodiment of the present invention, the oil extraction pipe 3 located in the oil chromatogram online monitoring cabinet 2 is disconnected, so that the two disconnected sections of the oil extraction pipe 3 and the oil outlet pipe 5 can be connected through the three-way valve 6. Therefore, when it is necessary to extract oil from the transformer, an oil outlet hose 52 can be installed on the oil outlet of the oil outlet pipe 5, and then the three-way valve 6 is controlled so that a part of the oil extraction pipe 3, the three-way valve 6, the oil outlet pipe 5 and the oil outlet hose 52 are connected in sequence, so as to facilitate the extraction of oil from the transformer body 1.

[0046] like Figure 1 As shown, the transformer oil extraction device based on the oil chromatography monitoring device according to an embodiment of the present invention includes a transformer body 1, an oil chromatography online monitoring cabinet 2, an oil extraction pipe 3, an oil return pipe 4 and an oil outlet pipe 5.

[0047] The transformer body 1 has a No. 1 oil inlet 11, a No. 2 oil return inlet 12 and a transformer body oil inlet 13. The No. 2 oil return inlet 12 is located above the No. 1 oil inlet 11, and the transformer body oil inlet 13 is located at the lower part of the transformer body 1. The transformer body oil inlet 13 is located below the No. 1 oil inlet 11. The transformer body oil inlet 13 is an oil inlet that requires manual access to the oil pipe.

[0048] An oil extraction device is provided in the oil chromatogram online monitoring cabinet 2. The oil extraction pipe 3 includes a first pipe section 31 and a second pipe section 32, the oil inlet of the first pipe section 31 is connected to the No. 1 oil extraction port 11, the oil outlet of the first pipe section 31 is connected to the first connecting port 61 of the three-way valve 6, the oil inlet of the second pipe section 32 is connected to the second connecting port 62 of the three-way valve 6, and the oil outlet of the second pipe section 32 is connected to the oil inlet of the oil extraction device.

[0049] The oil inlet of the oil return pipe 4 is connected to the oil extraction device, and the oil outlet of the oil return pipe 4 is connected to the second oil return port 12. The oil chromatogram online monitoring system in the oil chromatogram online monitoring cabinet 2 is a device for real-time monitoring of the dissolved gas content in the transformer oil. This system can detect potential faults inside the transformer in a timely manner by continuously analyzing the gas components in the oil, so as to take preventive measures to avoid equipment failures and power outages. The transformer oil can enter the oil extraction device from the oil extraction pipe 3, and then return to the transformer body 1 through the oil return pipe 4.

[0050] The oil inlet of the oil outlet pipe 5 is connected to the third connecting port 63 of the three-way valve 6. The oil outlet pipe 5 is provided with a check valve 51, which is a one-way valve so that the oil in the oil outlet pipe 5 can flow outward, and the external fluid cannot enter the oil extraction pipe 3 through the oil outlet pipe 5. The oil outlet of the oil outlet pipe 5 is provided with an oil outlet hose 52.

[0051] According to the embodiment of the present invention, the oil extraction device for the transformer based on the oil chromatography monitoring device of the embodiment of the present invention disconnects the oil extraction pipe 3 into the first pipe section 31 and the second pipe section 32 in the oil chromatography online monitoring cabinet 2, and the oil outlet pipe 5, the first pipe section 31 and the second pipe section 32 are connected in sequence through the three-way valve 6, so that when the oil in the transformer body 1 needs to be taken out, the oil can be discharged through the oil outlet pipe 5.

[0052] In some embodiments, in step S2, a storage box is set in the oil chromatogram online monitoring cabinet 2. Before taking oil, the oil outlet hose 52 is installed on the oil outlet of the oil outlet pipe 5. After the oil is taken, the oil outlet hose 52 is placed in the storage box. A storage box for placing the oil outlet hose 52 is provided in the oil chromatogram online monitoring cabinet 2, so that the oil outlet hose 52 is convenient to store, the storage location is clean and dry, and there is no need to remove and carry after the oil is taken, which effectively speeds up the oil taking efficiency. For example, the oil outlet hose 52 is made of at least one of rubber and silicone. The length of the oil outlet hose 52 is greater than or equal to 50 cm and less than or equal to 70 cm.

[0053] In some embodiments, in step S4, the three-way valve 6 is controlled so that the first pipe section 31 of the oil extraction pipe 3 is connected to the oil outlet pipe 5, so that oil can be taken from the transformer body 1 through the first pipe section 31, the three-way valve 6, the oil outlet pipe 5 and the oil outlet hose 52. Specifically, the three-way valve 6 can adjust the fluid flow discharged from the second connecting port 62 and the third connecting port 63, so that the three-way valve 6 can control the fluid flow into the second pipe section 32 and the oil outlet pipe 5, so that the flow of oil discharged from the oil outlet hose 52 is convenient for the staff to collect. For example, the three-way valve 6 is a multifunctional three-way valve.

[0054] In some embodiments, the distance between the three-way valve 6 and the bottom of the oil chromatogram online monitoring cabinet 2 is greater than or equal to 20 cm. For example, the distance between the three-way valve 6 and the bottom of the oil chromatogram online monitoring cabinet 2 is 40 cm.

[0055] In some embodiments, the first pipe section 31, the oil return pipe 4 and the oil outlet pipe 5 are all provided with an opening and closing valve 41, so as to prevent oil leakage. Specifically, the No. 1 oil intake port 11, the No. 2 oil return port 12 and the transformer body oil intake port 13 are all provided with sampling valves, and the opening and closing valve 41 in the first pipe section 31 is located in the oil chromatogram online monitoring cabinet 2.

[0056] In the related art, the design of the sampling valve opening of large transformers is relatively sophisticated and complex, the sampling position (oil extraction port 13 of the transformer body) is relatively low, the pressure at the bottom of the transformer is relatively high, the sampling frequency of technical supervision is relatively high, and the sampling valve opening is not easy to control during sampling, which can easily cause waste and pollution of oil samples. In addition, due to different installation methods, the ground clearance of the sampling valve is different, which makes it difficult to pick up leaking oil during the sampling process, and the sampling environment is unobstructed, and the ventilation and cooling systems are prone to dust, causing oil sample pollution. The sampling tubes are all elastic, and manual connection is difficult. If there is oil stain on the sampling valve or sampling tube, the sampling tube connection is easy to fall off, and the oil sample is easily sprayed onto the ground and the clothes of the sampling personnel during the sampling process. The sampling valve is prone to deformation and oil leakage after long-term use, and it is extremely inconvenient to replace.

[0057] The oil extraction method of the transformer based on the oil chromatography monitoring device according to the embodiment of the present invention is to disconnect and transform the oil extraction pipe 3 in the oil chromatography online monitoring cabinet 2, install a three-way valve 6 on the oil extraction pipe 3, install an oil outlet pipe 5 on the third connecting port 63 of the three-way valve 6, and install an oil outlet hose 52 on the oil outlet of the oil outlet pipe 5, so as to form a transformer according to the embodiment of the present invention. Thus, the installation position of the oil extraction device is changed, and the original oil extraction from the spiral oil drain valve position at the bottom of the transformer (the oil extraction port 13 of the transformer body) is changed to the oil extraction from the oil outlet pipe 5 in the oil chromatography online monitoring cabinet 2. The original single manual connection oil extraction is changed to a fixed and semi-closed oil extraction, so that oil can be discharged from the oil outlet pipe 5 in the oil chromatography online monitoring cabinet 2. After controlling the first pipe section 31 of the three-way valve 6 to be connected with the oil outlet pipe 5, the sampling valve on the No. 1 oil extraction port 11 is opened, and the transformer oil flows into the sampling container through the sampling valve and the oil outlet hose 52 by pressure, which greatly improves the convenience of oil extraction.

[0058] The three-way valve 6 controls the flow rate in the oil outlet pipe 5, thereby reducing the splashing of transformer oil, thereby reducing oil sample pollution and leakage problems. Before the transformation, oil extraction easily causes damage to the oil extraction valve. After the transformation, the oil extraction position (oil outlet pipe 5) is far away from the transformer body, further reducing the risk of oil extraction.

[0059] Therefore, the transformer oil extraction method based on the oil chromatography monitoring device according to the embodiment of the present invention has the advantage of being convenient for oil extraction.

[0060] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0061] In addition, 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. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0062] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0063] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0064] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0065] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A transformer oil extraction method based on an oil chromatography monitoring device, characterized in that: The transformer comprises a transformer body and an oil chromatogram online monitoring cabinet, wherein the transformer body has a No. 1 oil extraction port, and an oil extraction device in the oil chromatogram online monitoring cabinet is connected to the No. 1 oil extraction port through an oil extraction pipe. The transformer oil extraction method based on the oil chromatogram monitoring device comprises the following steps: S1, disconnecting the oil extraction pipe in the oil chromatogram online monitoring cabinet, and connecting the two disconnected pipe sections of the oil extraction pipe to the first connecting port and the second connecting port of the three-way valve respectively; S2, connecting the oil inlet of the oil outlet pipe to the third connecting port of the three-way valve, wherein the oil outlet pipe is provided with a check valve; S3, installing an oil outlet hose on the oil outlet of the oil outlet pipe; S4. Controlling the three-way valve so as to take oil from the transformer body through a portion of the oil taking pipe, the three-way valve, the oil outlet pipe and the oil outlet hose.

2. The transformer oil extraction method based on the oil chromatography monitoring device according to claim 1 is characterized in that: In step S1, The first communication port is a lower opening of the three-way valve, and the second communication port is an upper opening of the three-way valve; The oil extraction pipe is disconnected into a first pipe section and a second pipe section, the oil inlet of the first pipe section is connected to the No. 1 oil extraction port, the oil outlet of the first pipe section faces upward and is connected to the first connecting port, the oil inlet of the second pipe section faces downward and is connected to the second connecting port, and the oil outlet of the second pipe section is connected to the oil extraction device of the oil chromatogram online monitoring cabinet.

3. The transformer oil extraction method based on the oil chromatography monitoring device according to claim 1 is characterized in that: In step S2, The third communication port is a side opening of the three-way valve; A storage box is arranged in the oil chromatogram online monitoring cabinet. Before taking oil, the oil outlet hose is installed on the oil outlet of the oil outlet pipe. After taking oil, the oil outlet hose is placed in the storage box.

4. The transformer oil extraction method based on the oil chromatography monitoring device according to claim 2 is characterized in that: In step S4, the three-way valve is controlled so that the first pipe section of the oil extraction pipe is connected to the oil outlet pipe, so that oil can be extracted from the transformer body through the first pipe section, the three-way valve, the oil outlet pipe and the oil outlet hose.

5. The transformer oil extraction method based on the oil chromatography monitoring device according to claim 4 is characterized in that: In the step S4, the three-way valve can control the flow rate of the fluid flowing into the second pipe section and the oil outlet pipe.

6. A transformer oil extraction device based on an oil chromatography monitoring device, characterized in that: include A transformer body, wherein the transformer body has a No. 1 oil inlet, a No. 2 oil return inlet, and a transformer body oil inlet, wherein the No. 2 oil return inlet is located above the No. 1 oil inlet, the transformer body oil inlet is located at the bottom of the transformer body, and the transformer body oil inlet is located below the No. 1 oil inlet; An oil chromatogram online monitoring cabinet, wherein the oil chromatogram online monitoring cabinet is provided with an oil extraction device; An oil extraction pipe, the oil extraction pipe comprising a first pipe section and a second pipe section, the oil inlet of the first pipe section is connected to the first oil extraction port, the oil outlet of the first pipe section is connected to the first connecting port of the three-way valve, the oil inlet of the second pipe section is connected to the second connecting port of the three-way valve, and the oil outlet of the second pipe section is connected to the oil inlet of the oil extraction device; An oil return pipe, wherein the oil inlet of the oil return pipe is connected to the oil extraction device, and the oil outlet of the oil return pipe is connected to the second oil return port; An oil outlet pipe, the oil inlet of the oil outlet pipe is connected to the third connecting port of the three-way valve, and a check valve is provided on the oil outlet pipe.

7. The transformer oil extraction device based on the oil chromatography monitoring device according to claim 6 is characterized in that: An oil outlet hose is arranged on the oil outlet of the oil outlet pipe.

8. The transformer oil extraction device based on the oil chromatography monitoring device according to claim 6 is characterized in that: The oil outlet of the first pipe section faces upward, and the first communication port faces downward. The oil inlet of the second pipe section faces downward, and the second communication port faces upward.

9. The transformer oil extraction device based on the oil chromatography monitoring device according to claim 7, characterized in that: A storage box for placing the oil outlet hose is provided in the oil chromatogram online monitoring cabinet.

10. The transformer oil extraction device based on the oil chromatography monitoring device according to any one of claims 6 to 9, characterized in that: The distance between the three-way valve and the bottom of the oil chromatogram online monitoring cabinet is greater than or equal to 20 cm; The three-way valve can adjust the flow rate of the fluid discharged from the second communication port and the third communication port; The first pipe section, the oil return pipe and the oil outlet pipe are all provided with opening and closing valves.

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