Oil level gauge, oil reservoir and transformer

Abstract

This utility model discloses an oil level gauge, an oil tank, and a transformer. The oil level gauge includes an oil level tube, two connecting pipes, and an oil level monitoring component. The oil level tube has an internal oil level chamber with alternately spaced high and low oil level positions. At least a portion of the oil level tube is made of transparent insulating material. The two connecting pipes are spaced apart and connect the inner cavity of the oil tank to the oil level chamber. The oil level monitoring component includes two conductive elements and a conductive float. The two conductive elements are respectively positioned corresponding to the high and low oil level positions. The conductive float floats on the oil surface within the oil level chamber. When the conductive float contacts the conductive elements at the high or low oil level position, it emits a corresponding oil level indication signal. This utility model aims to achieve visualization of the oil level gauge, avoid false oil level readings, and simultaneously enable remote monitoring and alarms, improving the reliability of operation and maintenance.

Description

Technical Field

[0001] This utility model relates to the field of electrical equipment technology, and in particular to an oil level gauge, an oil tank, and a transformer. Background Technology

[0002] Oil level gauges are required to be installed on the transformer's oil conservator to indicate the oil level inside, allowing maintenance personnel to perform safe maintenance based on the indicated level. In related technologies, pointer-type oil level gauges are widely used in transformer oil conservator systems. These gauges consist of a pointer dial located outside the conservator and an oil level rod inside. The bladder expands and contracts according to the oil level, and the pointer on the dial rotates via the oil level rod. However, these pointer-type gauges not only have poor visibility but are also prone to displaying incorrect oil levels, resulting in false oil level readings. If maintenance personnel rely on false readings for transformer maintenance, unnecessary maintenance may occur, maintenance opportunities may be missed, and false readings could even cause transformer malfunctions, affecting the stability and reliability of the power supply. Furthermore, remote monitoring and alarm implementation with pointer-type oil level gauges is complex and costly. Utility Model Content

[0003] The main purpose of this utility model is to provide an oil level gauge that aims to make the oil level gauge visible, avoid false oil level readings, and enable remote monitoring and alarms, thereby improving the reliability of operation and maintenance.

[0004] To achieve the above objectives, the present invention proposes an oil level gauge, which is applied to an oil storage tank. The oil level gauge includes: An oil level tube has an internal oil level cavity, which has high oil level positions and low oil level positions spaced apart. At least a portion of the oil level tube is made of transparent insulating material. Two connecting pipes are spaced apart, and the two ends of each connecting pipe are respectively connected to the inner cavity of the oil tank and the oil level chamber; and An oil level monitoring component includes two conductive elements and a conductive float. The two conductive elements are respectively positioned to correspond to the high oil level position and the low oil level position. The conductive float floats on the oil surface in the oil level chamber. The conductive float contacts the conductive elements at the high oil level position or the low oil level position and emits a corresponding oil level indication signal.

[0005] In one embodiment of this utility model, the oil level pipe includes: The main body is made of transparent insulating material, and the two conductive components are respectively disposed on the inner wall surfaces of both ends of the main body, and the two connecting pipes are respectively connected to the main body; Two end caps are respectively sealed and connected to both ends of the main body. One of the end caps is also provided with a plurality of spaced-apart terminals. One end of the terminal is located in the part of the end cap that communicates with the oil level chamber, and the other end is located outside the oil level chamber. The two conductive components and the conductive float are each connected to a terminal block via a wire.

[0006] In one embodiment of the present invention, the main body is further provided with two mounting slots, the mounting slots are arranged around the inner wall surface of the main body, one mounting slot is arranged adjacent to the end face of the main body, and a conductive component is respectively installed in one of the mounting slots. The main body is also provided with a wire passage groove, the wire passage groove connecting the two mounting slots.

[0007] In one embodiment of the present invention, the oil level gauge further includes two sealing elements, which are respectively disposed between the conductive element and the end cap.

[0008] In one embodiment of this utility model, the inner diameter of the conductive element is not greater than the inner diameter of the main body.

[0009] In one embodiment of this utility model, the sidewalls at both ends of the oil level pipe are provided with abutment grooves; The end cap includes an end plate and a surrounding plate connected to the outer periphery of the end plate, the surrounding plate being inserted into an abutment groove.

[0010] In one embodiment of the present invention, the end cover having the wiring terminal further includes an extension plate, the extension plate being connected to the outer periphery of the end plate and extending in a direction away from the surrounding plate, the extension length of the extension plate being greater than the extension length of the wiring terminal outside the oil level cavity.

[0011] In one embodiment of this utility model, the outer surface of the main body is provided with an oil level scale line.

[0012] This utility model also provides an oil storage tank, which includes: An oil drum, wherein one end of the oil drum is open; A cover plate, wherein the cover plate is sealed to the open end of the oil drum, and the cover plate has two spaced-apart mounting holes communicating with the inner cavity of the oil drum; and An oil level gauge, wherein the two connecting pipes of the oil level gauge are respectively sealed and connected to the mounting hole.

[0013] This utility model also provides a transformer, which includes the oil conservator.

[0014] In this invention, a transparent, insulated oil level tube is used to connect the inner cavity of the oil tank and the oil level chamber via two spaced-apart connecting pipes, enabling visual monitoring of the oil level. An oil level monitoring component is installed, using a conductive float to contact a conductive element located at a high or low oil level position to form a conductive circuit, thereby triggering an alarm signal and achieving remote monitoring of the oil level. Compared to traditional pointer-type oil level gauges, this invention eliminates the need for an oil level rod inside the oil tank, avoiding errors and false oil level readings caused by mechanical transmission and jamming of the oil level rod, thus improving the accuracy of the oil level display. Furthermore, the oil level monitoring component can output corresponding oil level signals at high and low oil level positions, facilitating remote monitoring. This allows maintenance personnel to take maintenance measures based on the oil level signals output by the monitoring component. The structure for oil level monitoring in this solution is simple and cost-effective. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of an embodiment of the oil storage tank of this utility model; Figure 2 for Figure 1 Exploded view of the structure of the central oil storage tank; Figure 3 This is a cross-sectional view of an embodiment of the oil level gauge of this utility model; Figure 4 for Figure 3 A schematic diagram of the sectional view in another embodiment.

[0017] Explanation of icon numbers:

[0018] 100. Oil level gauge; 10. Oil level pipe; 11. Main pipe body; 111. Oil level chamber; 112. Mounting groove; 113. Wiring groove; 114. High oil level position; 115. Low oil level position; 116. Abutment groove; 13. End cap; 131. End plate; 132. Enclosure plate; 133. Extension plate; 134. Terminal block; 30. Oil level monitoring assembly; 31. Conductive component; 33. Conductive float; 40. Sealing component; 50. Connecting pipe; 200. Oil tank; 210. Oil drum; 230. Cover plate; 231. Mounting hole.

[0019] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0020] 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.

[0021] 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.

[0022] 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.

[0023] 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.

[0024] Oil level gauges are required to be installed on the transformer's oil conservator to indicate the oil level inside, allowing maintenance personnel to perform safe maintenance based on the indicated level. In related technologies, pointer-type oil level gauges are widely used in transformer oil conservator systems. These gauges consist of a pointer dial located outside the conservator and an oil level rod inside. The bladder expands and contracts according to the oil level, and the pointer on the dial rotates via the oil level rod. However, these pointer-type gauges not only have poor visibility but are also prone to displaying incorrect oil levels, resulting in false oil level readings. If maintenance personnel rely on false readings for transformer maintenance, unnecessary maintenance may occur, maintenance opportunities may be missed, and false readings could even cause transformer malfunctions, affecting the stability and reliability of the power supply. Furthermore, remote monitoring and alarm implementation with pointer-type oil level gauges is complex and costly.

[0025] To solve the above-mentioned technical problems, this utility model proposes an oil level gauge 100.

[0026] Reference Figure 1 and Figure 2 In one embodiment of this utility model, an oil level gauge 100 is applied to an oil tank 200. The oil level gauge 100 includes an oil level pipe 10, two connecting pipes 50, and an oil level monitoring component 30. The oil level pipe 10 has an oil level cavity 111 inside, which has a high oil level position 114 and a low oil level position 115. At least a portion of the oil level pipe 10 is made of transparent insulating material. The two connecting pipes 50 are arranged at intervals, and the two ends of each connecting pipe 50 are respectively connected to the inner cavity of the oil tank 200 and the oil level cavity 111. The oil level monitoring component 30 includes two conductive elements 31 and a conductive float 33. The two conductive elements 31 are respectively arranged corresponding to the high oil level position 114 and the low oil level position 115. The conductive float 33 floats on the oil surface in the oil level cavity 111. The conductive float 33 can contact the conductive elements 31 at the high oil level position 114 or the low oil level position 115 and emit a corresponding oil level indication signal.

[0027] Parts of the oil level tube 10 can be made of insulating materials such as glass or transparent acrylic, so that maintenance personnel can directly observe the oil level inside the oil level tube 10 from the outside. At least a part of the oil level tube 10 can be understood as a component of the oil level tube 10, or all components of the oil level tube 10, or a part of a component of the oil level tube 10. To ensure that the oil level tube 10 can withstand the vibration and pressure during transformer operation, it is made of high-strength, oil-resistant, and highly transparent engineering acrylic to ensure good mechanical properties and excellent oil resistance, preventing deformation or aging even after long-term contact with transformer oil. The oil level tube 10 has a cylindrical or square column structure with a hollow interior to form an oil level cavity 111 for containing oil. The high oil level position 114 and the low oil level position 115 of the oil level cavity 111 are set according to the height of the oil conservator 200. The connecting pipe 50 can be made of metal or acrylic to connect the inner cavity of the oil tank 200 and the oil level chamber 111 of the oil level gauge 100. The conductive component 31 can be made of metal such as copper or copper alloy, and the conductive component 31 is installed at the high oil level position 114 and the low oil level position 115 of the oil level chamber 111.

[0028] The conductive float 33 can be made of hollow metal spheres or metal sheets, such as aluminum alloy sheets, and is processed into a suitable float shape through a stamping process. During processing, the thickness and weight of the float are strictly controlled to ensure that it has appropriate buoyancy in the transformer oil and can sensitively follow changes in oil level. At the same time, the surface of the float is treated with anti-corrosion measures, such as coating with a corrosion-resistant metal film, to prevent corrosion caused by long-term contact with transformer oil. The conductive float 33 can float up and down with changes in oil level. When the conductive float 33 is at the high oil level position 114 or the low oil level position 115, the conductive float 33 will contact the conductive component 31 at the corresponding position, forming a conductive circuit, thereby triggering an alarm signal.

[0029] In one embodiment of this utility model, a transparent and insulated oil level pipe 10 is used to connect the inner cavity of the oil tank 200 and the oil level cavity 111 via two spaced-apart connecting pipes 50. This enables visual monitoring of the oil level in the oil tank 200. An oil level monitoring component 30 is installed, and a conductive float 33 contacts a conductive element 31 located at a high oil level position 114 or a low oil level position 115 to form a conductive circuit, thereby triggering an alarm signal and achieving remote detection of the oil level. Compared to the traditional pointer-type oil level gauge 100, this utility model eliminates the need for an oil level rod inside the oil tank 200, avoiding errors and false oil level readings caused by the mechanical transmission of the oil level rod, thus improving the accuracy of the oil level display. Furthermore, the oil level monitoring component 30 can output corresponding oil level signals at the high oil level position 114 and the low oil level position 115, facilitating remote monitoring. This allows maintenance personnel to take maintenance measures based on the oil level signals output by the oil level monitoring component 30. The structure for oil level monitoring in this solution is simple and cost-effective.

[0030] Reference Figures 2 to 4 In one embodiment of this utility model, the oil level pipe 10 includes a main body 11 and two end caps 13. The main body 11 is made of transparent insulating material. Two conductive elements 31 are respectively disposed at both ends of the main body 11. Two connecting pipes 50 are respectively connected to the main body 11. The two end caps 13 are respectively sealed and connected to the inner wall surfaces of both ends of the main body 11. One of the end caps 13 is provided with a plurality of spaced terminals 134. One end of the terminal 134 is located in the part of the end cap 13 that communicates with the oil level cavity 111, and the other end extends to the outside of the oil level cavity 111. The conductive elements 31 and the conductive floats 33 are respectively connected to the terminal 134 through wires.

[0031] In one embodiment of this utility model, the main body 11 can be made of insulating materials such as glass or transparent acrylic to ensure oil level visibility. To facilitate maintenance personnel in directly observing the scale position corresponding to the conductive float 33 to obtain oil level data, an oil level scale line is also provided on the outer surface of the main body 11. The oil level scale line can be directly printed or etched on the outer surface of the main body 11. The scale line can be set as horizontal stripes with equal spacing and marked with corresponding height values ​​so that maintenance personnel can directly understand the actual oil level through the scale line. The main body 11 and the two connecting pipes 50 can be connected separately or as an integral structure. The two end caps 13 can be sealed to the main body 11 by means of threaded connection, snap connection, or ultrasonic welding. The wiring terminal 134 is made of copper material with good conductivity, and its quantity is set to 3 according to actual needs. The wiring terminal 134 can be integrated with the end cap 13 by means of insert to improve its sealing performance and also avoid the problem of sealing the terminal hole due to the setting of the terminal hole. The conductors can be oil-resistant insulated wires, and wiring is achieved through the wire groove 113. Understandably, the conductors can be soldered to the terminals 134 and conductive components 31. The wire groove 113 facilitates the wiring of the two conductive components 31. The connection structure between the conductive component 31 and the terminal 134 ensures reliable electrical signal transmission, facilitating remote monitoring. The sealing design of the end cap 13 ensures the sealing of the oil level chamber 111, preventing oil leakage.

[0032] Understandably, terminal 134 here is only used to achieve electrical signal conduction between the two conductive components 31 and the conductive float 33, and does not represent the connection of the entire oil level detection circuit. The conductive components 31 and the conductive float 33 inside the oil level gauge 100 are connected to external signal lines via wires and terminal 134. Shielded cables are used for signal transmission to reduce the impact of external electromagnetic interference on the signal. One end of the cable connects to the wiring of the oil level gauge 100, and the other end connects to the signal acquisition module of the background monitoring system. In the background monitoring system, an alarm program is set for abnormal oil level signals. When the conductive float 33 contacts the conductive component 31 at the low oil level position 115 or the conductive component 31 at the high oil level position 114, the detection circuit forms a closed loop, the corresponding oil level signal is transmitted to the system background, and the alarm program is immediately activated. This can alert maintenance personnel to the abnormal oil level through audible and visual alarms. Simultaneously, the background system records the time and related information of the oil level anomaly for subsequent analysis and processing by maintenance personnel.

[0033] Reference Figures 2 to 4 In one embodiment of the present invention, the sidewalls of the two ends of the oil level pipe 10 are provided with abutment grooves 116; the end cap 13 includes an end plate 131 and a surrounding plate 132 connected to the outer periphery of the end plate 131, and the surrounding plate 132 is inserted into the abutment groove 116.

[0034] In one embodiment of this utility model, the abutment groove 116 is an annular groove structure, the depth of which matches the thickness of the surrounding plate 132, ensuring that the surrounding plate 132 can be tightly inserted and fixed. The tight fit between the surrounding plate 132 and the abutment groove 116 effectively prevents oil leakage, achieving rapid positioning and stable connection between the end cap 13 and the oil level pipe 10. Compared with threaded connections or snap-fit ​​fixing, the fit between the surrounding plate 132 and the abutment groove 116 has higher sealing reliability and assembly efficiency, and will not loosen due to long-term vibration. Furthermore, sealant can be injected after the surrounding plate 132 is inserted into the abutment groove 116 to further enhance the sealing effect.

[0035] The end plate 131 and the surrounding plate 132 are integrally formed. The length of the surrounding plate 132 is slightly less than the depth of the abutment groove 116 to allow for an appropriate gap for filling with sealing material after insertion. The inner wall of the abutment groove 116 may be provided with anti-slip textures or raised structures to enhance the friction between the surrounding plate 132 and the abutment groove 116 and prevent the end cap 13 from loosening. In addition, the inner surface of the surrounding plate 132 may be coated with an oil-resistant rubber layer to further improve the sealing performance.

[0036] Reference Figures 2 to 4 In one embodiment of the present invention, the end cover 13 with the wiring terminal 134 further includes an extension plate 133. The extension plate 133 is connected to the outer periphery of the end plate 131 and extends in a direction away from the surrounding plate 132. The extension length of the extension plate 133 is greater than the extension length of the wiring terminal 134 outside the oil level chamber 111.

[0037] In one embodiment of the present invention, the extension plate 133, the end plate 131, and the surrounding plate 132 are integral structures. The extension plate 133 serves as an additional structure of the end cover 13 and is used to protect the wiring terminal 134 extending outside the oil level chamber 111. The extension length of the extension plate 133 is 1.5-2 times the extension length of the wiring terminal 134 outside the oil level chamber 111 to ensure coverage of the wiring terminal 134. The extension plate 133 forms a physical isolation barrier to prevent external objects from directly colliding with the wiring terminal 134 and reduce the risk of loose connection lines.

[0038] Reference Figures 2 to 4 In one embodiment of the present invention, the main body 11 is further provided with two mounting grooves 112. The mounting grooves 112 are arranged around the inner wall surface of the main body 11. One mounting groove 11 is arranged near the end face of the main body 11. A conductive component 31 is respectively installed in one mounting groove 112. The main body 11 is also provided with a wire passage groove 113, which connects the two mounting grooves 112.

[0039] In one embodiment of this utility model, the mounting groove 112 is an annular groove structure provided on the inner wall of the main body 11. Its depth and width are designed according to the size of the conductive component 31 to ensure that the conductive component 31 can be stably installed. The wire passage groove 113 is a channel provided on the inner wall of the main body 11 to accommodate the wires connecting the conductive component 31. The cross-sectional shape of the wire passage groove 113 can be rectangular, circular, or other shapes suitable for the wires to pass through. By setting the mounting groove 112 and the wire passage groove 113, the stable installation of the conductive component 31 and the orderly arrangement of the wires are achieved. The mounting groove 112 enables the conductive component 31 to be accurately positioned inside the main body 11, ensuring reliable contact with the conductive float 33. The wire passage groove 113 connects the two mounting grooves 112, facilitating the routing of wires inside the main body 11 and avoiding exposed wires that affect aesthetics or cause safety hazards. This structural design improves the installation accuracy and reliability of the oil level monitoring component 30, while simplifying internal wiring and facilitating production and maintenance.

[0040] Reference Figures 2 to 4 In one embodiment of the present invention, the oil level gauge 100 further includes two sealing elements 40, which are respectively disposed between the conductive element 31 and the end cap 13.

[0041] In one embodiment of this utility model, the sealing element 40 can be made of elastic materials such as rubber, silicone, nitrile rubber, or acrylate, and its shape matches the mounting groove 112, such as an annular gasket or an O-ring. The sealing element 40 fills the gap between the conductive element 31 and the end cap 13 by compression deformation, preventing oil leakage. Specifically, the sealing element 40 can be disposed between the axial end face of the conductive element 31 and the inner side of the end cap 13, or it can wrap around the circumferential outer surface of the conductive element 31. By providing the sealing element 40 between the conductive element 31 and the end cap 13, the problem of oil leakage caused by insufficient sealing of the oil level chamber 111 is effectively solved, avoiding oil leakage and environmental pollution. Figures 2 to 4 In one embodiment of this utility model, the inner diameter of the conductive element 31 is not greater than the inner diameter of the main body 11.

[0042] In one embodiment of the present invention, the conductive element 31 adopts a ring-shaped metal structure, and its inner diameter is the same as or slightly smaller than the inner diameter of the main body 11. In an optional embodiment, the inner diameter of the conductive element 31 is 1-3 mm smaller than the inner diameter of the main body 11. In this way, when the conductive float 33 floats up and down in the oil level cavity 111, it shakes, so as to make contact with the conductive element 31 and realize circuit conduction.

[0043] Reference Figure 1 and Figure 2This utility model also proposes an oil storage tank 200, which includes an oil drum 210, a cover plate 230, and an oil level gauge 100. One end of the oil drum 210 is open, and the cover plate 230 is sealed to the open end of the oil drum 210. The cover plate 230 and the oil drum 210 enclose an inner cavity for containing oil. Typically, the oil storage tank 200 is horizontally positioned, i.e., it is placed horizontally. The cover plate 230 has two spaced-apart mounting holes 231 that communicate with the inner cavity of the oil drum 210. The two connecting pipes 50 in the oil level gauge 100 are respectively sealed to the mounting holes 231. The specific structure of the oil level gauge 100 is as described in the above embodiments. Since this oil storage tank 200 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0044] Understandably, to ensure reliable sealing between the oil level gauge 100 and the oil tank 200, a sealing gasket is installed between the mounting hole 231 and the connecting pipe 50. The sealing gasket is made of oil-resistant rubber, and its shape matches the contact area between the connecting pipe 50 and the mounting hole 231. A limiting step is provided on the connecting pipe 50, and the sealing gasket abuts against the limiting step. Then, fasteners such as bolts and nuts are used to fix the connecting pipe 50 to the cover plate 230 and press the sealing gasket tightly to ensure a good seal and no oil leakage.

[0045] This utility model also provides a transformer, which includes an oil conservator 200. The oil conservator 200 includes an oil tank 210, a cover plate 230, and an oil level gauge 100. The specific structure of the oil conservator 200 is as described in the above embodiments. Since this transformer adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0046] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. An oil level gauge for use in an oil reservoir, characterised in that, The oil level gauge includes: An oil level tube has an oil level cavity inside, the oil level cavity having high oil level positions and low oil level positions spaced apart, and at least a portion of the oil level tube is made of transparent insulating material; Two connecting pipes are spaced apart, and the two ends of each connecting pipe are respectively connected to the inner cavity of the oil tank and the oil level chamber; and An oil level monitoring component includes two conductive elements and a conductive float. The two conductive elements are respectively positioned to correspond to the high oil level position and the low oil level position. The conductive float floats on the oil surface in the oil level chamber. The conductive float contacts the conductive elements at the high oil level position or the low oil level position and emits a corresponding oil level indication signal.

2. The oil level gauge as described in claim 1, characterized in that, The oil level pipe includes: The main body is made of transparent insulating material, and the two conductive components are respectively disposed on the inner wall surfaces of both ends of the main body. The two connecting pipes are respectively connected to the main body. Two end caps are respectively sealed and connected to both ends of the main body. One of the end caps is also provided with a plurality of spaced-apart terminals. One end of the terminal is located in the part of the end cap that communicates with the oil level chamber, and the other end is located outside the oil level chamber. The two conductive components and the conductive float are each connected to a terminal block via a wire.

3. The oil level gauge as described in claim 2, characterized in that, The main body is also provided with two mounting slots, which are arranged around the inner wall of the main body. One mounting slot is arranged near the end face of the main body. A conductive component is installed in one of the mounting slots. The main body is also provided with a wire passage groove, which connects the two mounting slots.

4. The oil level gauge as described in claim 3, characterized in that, The oil level gauge also includes two sealing elements, which are respectively disposed between the conductive element and the end cap.

5. The oil level gauge as described in claim 3, characterized in that, The inner diameter of the conductive element is not greater than the inner diameter of the main body.

6. The oil level gauge as described in claim 2, characterized in that, The sidewalls at both ends of the oil level pipe are provided with abutment grooves; The end cap includes an end plate and a surrounding plate connected to the outer periphery of the end plate, the surrounding plate being inserted into an abutment groove.

7. The oil level gauge as described in claim 6, characterized in that, The end cap with the terminal block also includes an extension plate, which is connected to the outer periphery of the end plate and extends in a direction away from the surrounding plate. The extension length of the extension plate is greater than the extension length of the terminal block outside the oil level chamber.

8. The oil level gauge as described in claim 2, characterized in that, The outer surface of the main body is provided with oil level markings.

9. An oil storage tank, characterized in that, include: An oil drum, wherein one end of the oil drum is open; A cover plate, which is sealed to the open end of the oil drum, and the cover plate has two spaced-apart mounting holes that communicate with the inner cavity of the oil drum; as well as The oil level gauge as described in any one of claims 1 to 8, wherein the two connecting pipes in the oil level gauge are respectively sealed to the mounting hole.

10. A transformer, characterized in that, Includes the oil storage tank as described in claim 9.

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