Oil level measuring device for 10kV oil storage cabinet transformer

Abstract

This application belongs to the field of oil level measurement technology, specifically providing an oil level measuring device for a 10kV oil conservator transformer. The device includes a housing, a connecting rod, and a measuring tube. The connecting rod is vertically detachable within the housing, with a protruding pressing point at one end extending through the housing along its length. The measuring tube is fixed relative to the housing, positioned at the end of the housing furthest from the pressing point, and extends into the housing along its length. The connecting rod operates in two states: a first state and a second state. In the first state, the connecting rod is separated from the measuring tube, and the measuring tube extends into the oil. In the second state, the connecting rod abuts against the measuring tube, sealing the end of the measuring tube furthest from the oil. By setting up a measuring tube and extending it into the housing in conjunction with the vertically detachable connecting rod, the distance between the oil level inside the oil conservator transformer and the transformer cover can be accurately measured, reducing the probability of transformer failure.

Description

Technical Field

[0001] This application belongs to the field of oil level measurement technology, specifically relating to an oil level measuring device for a 10kV oil storage tank transformer. Background Technology

[0002] In terms of the usage of high-voltage transformers, 10kV transformers account for 80% of the total, and 10kV oil-container type transformers account for 65% of 10kV transformers.

[0003] Frequent failures have occurred in 10kV oil-conserving transformers. Analysis of these failures revealed that most were caused by a drop in the oil level inside the transformer.

[0004] After installation, a 10kV oil-container transformer maintains a 2-3° angle with the ground. Since the oil level inside the transformer remains horizontal, an air gap resembling a single-sided right-angled trapezoid exists between the oil surface and the transformer cover. This prevents some taps from being immersed in the transformer oil, thus failing to provide adequate insulation. Due to the difference in insulating strength between air and transformer oil, under heavy loads or overvoltage conditions, the transformer oil near the surface or taps exposed above the oil level are prone to puncturing the air gap, discharging to the casing and causing single-phase grounding or phase-to-phase short-circuit grounding.

[0005] Currently, although the oil level measuring device built into the 10kV oil conservator transformer can see the oil level, it can only give a general range, such as whether the oil level is sufficient or insufficient. It is difficult to capture the subtle changes in the oil level inside the oil conservator transformer, and therefore it is impossible to accurately judge the oil level inside the 10kV oil conservator transformer.

[0006] Therefore, there is an urgent need for a measuring device that can accurately determine the specific location of the oil level inside a 10kV oil conservator transformer, so as to carry out targeted maintenance on the 10kV oil conservator transformer. Summary of the Invention

[0007] Therefore, the technical problem to be solved by this application is to provide an oil level measuring device for a 10kV oil conservator transformer, which can accurately measure the distance between the oil level inside the 10kV oil conservator transformer and the transformer cover, thereby reducing the probability of failure of the 10kV oil conservator transformer; at the same time, it can accurately determine the specific location of the oil level, which is convenient for targeted maintenance of the transformer.

[0008] To address the aforementioned issues, this application provides an oil level measuring device for a 10kV oil storage tank transformer, comprising a housing, a connecting rod, and a measuring tube. The connecting rod is vertically and flexibly disposed within the housing, and a protruding pressing point is formed at one end of the connecting rod that penetrates the housing along its length. The measuring tube is fixed relative to the housing and is disposed at the end of the housing away from the pressing point, penetrating the housing along its length to extend into the housing.

[0009] The working states of the connecting rod include a first state and a second state. When the connecting rod is in the first state, it is separated from the measuring tube, and the measuring tube extends into the oil. When the connecting rod is in the second state, it is in contact with the measuring tube, and the connecting rod is used to close the end of the measuring tube away from the oil.

[0010] Optionally, the oil level measuring device for the 10kV oil storage tank transformer further includes a sealing gasket, which is disposed at the end of the connecting rod near the measuring tube.

[0011] Optionally, the oil level measuring device for the 10kV oil storage tank transformer further includes a pressure spring, which is disposed between the connecting rod and the sealing gasket. The first end of the pressure spring is connected to the connecting rod, and the second end of the pressure spring is fixed relative to the sealing gasket.

[0012] When the working state of the connecting rod switches from the first state to the second state, the pressure spring deforms and is used to apply an elastic force to the sealing gasket in the direction of the measuring tube.

[0013] Optionally, the sealing gasket is made of a flexible material.

[0014] Optionally, the measuring tube is made of a transparent material.

[0015] Optionally, the measuring tube is marked with a scale in millimeters, and the scale increases along the direction of the measuring tube toward the oil.

[0016] Optionally, the oil level measuring device for the 10kV oil storage tank transformer further includes a limiter, which includes a short side and a long side. At least part of the short side is disposed inside the housing and is fixed relative to the measuring tube. The long side is disposed on the side of the housing near the oil and is perpendicular to the measuring tube. An initial scale is marked on the measuring tube at a position relative to the long side.

[0017] Optionally, a press-lock buckle is provided on the outer peripheral wall of the connecting rod, and a locking hole is provided on the outer shell. When the connecting rod is switched to the second working state, the press-lock buckle is inserted into the locking hole to restrict the lifting and lowering of the connecting rod.

[0018] Optionally, the connecting rod includes a first section and a second section, the first section being disposed on the side of the second section opposite to the measuring tube, and the diameter of the first section being larger than the diameter of the second section; the oil level measuring device for the 10kV oil storage tank transformer further includes a stop ring and a return spring, the stop ring being fixed relative to the outer shell, the projection of the stop ring on the connecting rod being located on the second section, the return spring being disposed between the first section and the stop ring, the first end of the return spring being connected to the first section, and the second end of the return spring being fixed relative to the stop ring;

[0019] When the working state of the connecting rod switches from the first state to the second state, the return spring accumulates elastic potential energy under the drive of the connecting rod; when the working state of the connecting rod switches from the second state to the first state, the elastic potential energy of the return spring is released.

[0020] Optionally, the oil level measuring device for the 10kV oil storage tank transformer also includes a level, which is mounted on the housing.

[0021] Beneficial effects

[0022] The oil level measuring device for a 10kV oil conservator transformer provided in the embodiments of the present invention, by setting a measuring tube and having the measuring tube extend into the outer shell and cooperate with the liftable connecting rod, can accurately measure the distance between the oil level inside the oil conservator transformer and the transformer cover. It can easily capture subtle changes in the oil level inside the oil conservator transformer, thereby accurately judging the oil level inside the oil conservator transformer and reducing the probability of oil conservator transformer failure. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of an oil level measuring device for a 10kV oil storage tank transformer when the connecting rod is in the first state, according to an optional embodiment of this application.

[0024] Figure 2 This is a schematic diagram of the structure of an oil level measuring device for a 10kV oil storage tank transformer when the connecting rod is in the second state, according to an optional embodiment of this application.

[0025] The reference numerals in the attached figures are as follows:

[0026] 1. Outer shell; 2. Connecting rod; 21. First section; 22. Second section; 3. Measuring tube; 4. Sealing gasket; 5. Pressure spring; 6. Limiter; 61. Short side; 62. Long side; 7. Press lock; 8. Stop ring; 9. Return spring; 10. Level. Detailed Implementation

[0027] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the present invention.

[0028] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0029] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0030] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0031] See Figure 1 and Figure 2As shown in the embodiment of this application, an oil level measuring device for a 10kV oil conservator transformer is provided, including a housing 1, a connecting rod 2, and a measuring tube 3. The connecting rod 2 is vertically and vertically disposed inside the housing 1, and a protruding pressing point is formed at one end of the housing 1 that extends through the housing 1 along its length. The measuring tube 3 is fixed relative to the housing 1 and is disposed at the end of the housing 1 away from the pressing point, extending through the housing 1 along its length to reach into the housing 1. The working states of the connecting rod 2 include a first state and a second state. When the connecting rod 2 is in the first state, the connecting rod 2 is separated from the measuring tube 3, and the measuring tube 3 extends into the oil. When the connecting rod 2 is in the second state, the connecting rod 2 abuts against the measuring tube 3, and the connecting rod 2 is used to close the end of the measuring tube 3 away from the oil. By setting a measuring tube 3 and having it extend into the outer casing 1 to cooperate with the liftable connecting rod 2, the distance between the oil level inside the oil conservator transformer and the transformer cover can be accurately measured. This makes it easy to capture subtle changes in the oil level inside the oil conservator transformer, thereby accurately judging the oil level inside the oil conservator transformer and reducing the probability of oil conservator transformer failure.

[0032] The outer casing 1 can be a cylinder with open ends. The outer casing 1 is used to install the connecting rod 2 and the measuring tube 3. By setting the outer casing 1, a stable setting position is provided for the connecting rod 2 and the measuring tube 3, which improves the reliability of oil level measurement.

[0033] The connecting rod 2 is vertically and flexibly disposed within the housing 1, meaning that the connecting rod 2 is relatively displaced relative to the housing 1 along its length. In this embodiment, the length direction of the housing 1 is the height direction of the housing 1.

[0034] Specifically, during the movement of connecting rod 2 relative to housing 1, at least a portion of connecting rod 2 protrudes towards the open upper side of housing 1 to form a pressing point. It should be noted that the inspector can adjust the position of connecting rod 2 relative to housing 1 by pushing or pulling the pressing point, that is, control the lifting and lowering of connecting rod 2 and adjust the working state of connecting rod 2.

[0035] The measuring tube 3 is located at the end of the outer shell 1 away from the pressing point. The measuring tube 3 is fixed relative to the outer shell 1, that is, the measuring tube 3 is stationary relative to the outer shell 1 in the length direction of the outer shell 1.

[0036] Specifically, one end of the measuring tube 3 can extend into the housing 1 through the open end of the housing 1.

[0037] In this configuration, the connecting rod 2 is positioned opposite the measuring tube 3 along the length of the outer casing 1.

[0038] Specifically, the outer diameter of connecting rod 2 is larger than the inner diameter of measuring tube 3.

[0039] The working states of the connecting rod 2 include a first state and a second state. When the connecting rod 2 switches from the first state to the second state, the connecting rod 2 moves toward the measuring tube 3. When the connecting rod 2 switches from the second state to the first state, the connecting rod 2 moves away from the measuring tube 3.

[0040] Specifically, when the connecting rod 2 is in the first working state, the connecting rod 2 is separated from the measuring tube 3, and both ends of the measuring tube 3 are open to the atmosphere, so that when the measuring tube 3 is inserted into the oil inside the oil conservator transformer, the oil can enter the measuring tube 3 until the oil level in the measuring tube 3 is the same as the oil level inside the oil conservator transformer. When the connecting rod 2 is in the second working state, the connecting rod 2 is in contact with the measuring tube 3, and the connecting rod 2 can seal the end of the measuring tube 3 away from the oil. At this time, the air pressure at the end of the measuring tube 3 away from the connecting rod 2 is balanced, so that the oil level in the measuring tube 3 will not drop, and the oil is stored in the measuring tube 3. The measuring tube 3 can be removed from the oil inside the oil conservator transformer for observation.

[0041] In one implementation, the length of the measuring tube 3 is greater than the height of the oil tank of the oil conservator transformer, allowing the measuring tube 3 to extend to the bottom of the oil tank. In this case, the oil level inside the measuring tube 3 is used to characterize the oil level inside the oil conservator transformer. In another implementation, the length of the measuring tube 3 is less than the height of the oil tank, preventing the measuring tube 3 from extending to the bottom of the oil tank. In this case, the oil level inside the measuring tube 3 cannot characterize the oil level inside the oil conservator transformer, but the height of the oil-free section above the oil level inside the measuring tube 3 can characterize the distance between the oil surface inside the oil conservator transformer and the transformer cover. That is, the height of the oil-free section above the oil level inside the measuring tube 3 can determine the distance between the oil surface inside the oil conservator transformer and the transformer cover. It should be noted that the oil-free section is the part of the measuring tube 3 that extends into the oil conservator transformer but contains no oil.

[0042] Specifically, in this embodiment, the length of the measuring tube 3 is less than the height of the oil tank of the oil conservator transformer. By measuring the height of the oil-free section above the oil level inside the measuring tube 3, the distance between the oil level inside the oil conservator transformer and the transformer cover can be accurately determined, making it easier to judge the oil level inside the oil conservator transformer and reducing the probability of transformer failure. It is understood that the height of the oil-free section can be measured using tools such as rulers, tape measures, and calipers. However, due to the size of the measuring hole, the measurement is cumbersome, requires manual secondary calculation, and is inaccurate, or the measuring tools are expensive.

[0043] In some possible implementations provided in this application, see [link to relevant documentation]. Figure 1 and Figure 2As shown, the oil level measuring device for a 10kV oil conservator transformer also includes a sealing gasket 4, which is located at the end of the connecting rod 2 near the measuring tube 3. By placing the sealing gasket 4 at the end of the connecting rod 2 near the measuring tube 3, the sealing effect of the connecting rod 2 on the end of the measuring tube 3 away from the oil can be improved, ensuring that the oil level inside the measuring tube 3 remains unchanged after it is removed from the oil, thereby improving the accuracy of the measurement results.

[0044] The sealing pad 4 can be cylindrical or cuboid, etc. The sealing pad 4 is set at the end of the connecting rod 2 near the measuring tube 3, and the sealing pad 4 moves synchronously with the connecting rod 2.

[0045] Specifically, when the connecting rod 2 is in the first working state, the sealing gasket 4 is separated from the measuring tube 3; when the connecting rod 2 is in the second working state, the sealing gasket 4 abuts against the end of the measuring tube 3 away from the oil, and is used to seal the measuring tube 3.

[0046] In some possible implementations provided in this application, see [link to relevant documentation]. Figure 1 and Figure 2 As shown, the oil level measuring device for a 10kV oil storage tank transformer also includes a pressure spring 5. The pressure spring 5 is disposed between the connecting rod 2 and the sealing gasket 4. The first end of the pressure spring 5 is connected to the connecting rod 2, and the second end of the pressure spring 5 is fixed relative to the sealing gasket 4. When the working state of the connecting rod 2 switches from the first state to the second state, the pressure spring 5 deforms and is used to apply an elastic force to the sealing gasket 4 in the direction of the measuring tube 3.

[0047] Understandably, after repeated use, the end of the measuring tube 3 that contacts the sealing gasket 4 in the oil level measuring device of a 10kV oil conservator transformer is prone to wear. Since the travel of the connecting rod 2 and the sealing gasket 4 is fixed, the sealing gasket 4 may not be able to seal tightly with the measuring tube 3. By setting a pressure spring 5 and connecting the connecting rod 2 to the sealing gasket 4 through the pressure spring 5, the wear of the measuring tube 3 can be compensated, thereby improving the sealing effect at the end of the measuring tube 3 away from the oil. This ensures that the oil level inside the measuring tube 3 remains unchanged after it is removed from the oil, thus improving the accuracy of the measurement results.

[0048] Among them, the pressure spring 5 can be helical, which is an elastic element that undergoes elastic deformation under pressure.

[0049] Specifically, when connecting rod 2 switches from the first state to the second state, connecting rod 2 drives the sealing gasket 4 to move towards the measuring tube 3 via pressure spring 5, and continues to move towards the measuring tube 3 after the sealing gasket 4 contacts the end of the measuring tube 3. At this time, since the sealing gasket 4 is fixed, the pressure spring 5 deforms under the pressure applied by connecting rod 2, thereby applying an elastic force to the sealing gasket 4 towards the measuring tube 3, improving the sealing effect of the sealing gasket 4 on the end of the measuring tube 3 away from the oil.

[0050] In some possible embodiments provided in this application, the sealing gasket 4 is made of a flexible material. By making the sealing gasket 4 of a flexible material, wear on the sealing gasket 4 and the measuring tube 3 can be reduced, thus extending the service life of the device.

[0051] In some possible embodiments provided in this application, the measuring tube 3 is made of a transparent material. By making the measuring tube 3 transparent, it is easier for inspectors to determine the oil level inside the measuring tube 3, thereby improving the accuracy of the measurement results.

[0052] In some possible implementations provided in this application, see [link to relevant documentation]. Figure 1 and Figure 2 As shown, the measuring tube 3 is marked with millimeter-level graduations, which increase in the direction towards the oil in the measuring tube 3. Setting millimeter-level graduations on the measuring tube 3 improves the accuracy of oil level measurement, enabling maintenance personnel to accurately determine the oil level inside the oil conservator transformer and reduce the probability of transformer failure.

[0053] The scale includes scale lines and scale values. The scale lines extend along the length of the measuring tube 3, and the distance between two adjacent scale values ​​is 1 mm.

[0054] Specifically, the scale values ​​increase vertically from top to bottom. In this embodiment, the scale value corresponding to the height of the inner wall of the transformer cover is the reference point, i.e., the starting point of the scale.

[0055] In some possible implementations provided in this application, see [link to relevant documentation]. Figure 1 and Figure 2 As shown, the oil level measuring device for a 10kV oil storage tank transformer also includes a limiter 6. The limiter 6 includes a short side 61 and a long side 62. At least part of the short side 61 is located inside the housing 1 and is fixed relative to the measuring tube 3. The long side 62 is located on the side of the housing 1 near the oil. The long side 62 is perpendicular to the measuring tube 3. The measuring tube 3 is marked with an initial scale at a position relative to the long side 62.

[0056] The limiter 6 includes a short side 61 and a long side 62, which can be integrally formed.

[0057] Among them, the short side 61 can be a partial cylindrical surface, and the axis of the partial cylindrical surface coincides with the axis of the measuring tube 3.

[0058] Among them, the long side 62 can be a fan ring, and the axis of the fan ring also coincides with the axis of the measuring tube 3.

[0059] Specifically, the central angle of some cylindrical surfaces coincides with and is the same as the central angle of the sector ring.

[0060] The short side 61 extends along the axial direction of the measuring tube 3, and the long side 62 extends along the radial direction perpendicular to the measuring tube 3.

[0061] Specifically, the short side 61 is disposed inside the outer casing 1 and is fixed relative to the measuring tube 3, while the long side 62 is disposed outside the outer casing 1 and is fixed relative to the short side 61. In one embodiment, the long side 62 is fitted against the end face of the outer casing 1, in which case the entire short side 61 is disposed inside the outer casing 1; in another embodiment, there is a gap between the long side 62 and the end face of the outer casing 1, and this gap is used to snap onto the transformer cover, in which case a portion of the short side 61 is disposed inside the outer casing 1.

[0062] The long side 62 is used to fit the inner wall of the transformer cover to ensure that the measuring tube 3 is perpendicular to the transformer cover.

[0063] Specifically, the initial scale is marked at the position on the measuring tube 3 relative to the long side 62. By setting the initial scale at the position on the measuring tube 3 relative to the long side 62, maintenance personnel can accurately measure the distance between the oil level inside the oil conservator transformer and the transformer cover, avoiding interference from the thickness of the transformer cover on the measurement results and improving the accuracy of the measurement results.

[0064] In some possible implementations provided in this application, see [link to relevant documentation]. Figure 2 As shown, a press-lock 7 is provided on the outer peripheral wall of the connecting rod 2, and a locking hole is provided on the outer shell 1. When the connecting rod 2 switches to the second working state, the press-lock 7 is inserted into the locking hole to restrict the lifting and lowering of the connecting rod 2.

[0065] The press-lock 7 is located on the outer peripheral wall of the connecting rod 2, and the height of the press-lock 7 protruding from the outer peripheral wall of the connecting rod 2 is adjustable.

[0066] Specifically, the press-lock 7 includes a main body, a movable latch, and an elastic element. The main body is fixedly mounted on the outer peripheral wall of the connecting rod 2 to support and fix the movable latch. The movable latch can be the part that is pressed and moves, and cooperates with the main body to lock and unlock. The elastic element can be a spring, etc., to reset the movable latch after pressing.

[0067] The locking hole can be round, square, elliptical, or polygonal, etc.

[0068] Specifically, when the connecting rod 2 is switched to the second state, the pressing latch 7 is positioned opposite to the locking hole. The pressing latch 7 can be inserted into the locking hole, which is used to limit the pressing latch in the lifting direction of the connecting rod 2, thereby achieving the purpose of limiting the lifting of the connecting rod 2. At this time, there is no need for maintenance personnel to continuously apply force to the connecting rod 2 through the pressing point, which can reduce the amount of manual labor and improve the convenience of operation.

[0069] It is understandable that when link 2 switches from the second state to the first state, it is necessary to first unlock the press lock 7, that is, press the press lock 7 so that the press lock 7 can be disengaged from the locking hole.

[0070] In some possible implementations provided in this application, see [link to relevant documentation]. Figure 1 and Figure 2 As shown, the connecting rod 2 includes a first section 21 and a second section 22. The first section 21 is located on the side of the second section 22 away from the measuring tube 3, and the diameter of the first section 21 is larger than the diameter of the second section 22. The oil level measuring device for the 10kV oil storage tank transformer also includes a stop ring 8 and a return spring 9. The stop ring 8 is fixed relative to the outer shell 1, and the projection of the stop ring 8 on the connecting rod 2 is located on the second section 22. The return spring 9 is located between the first section 21 and the stop ring 8. The first end of the return spring 9 is connected to the first section 21, and the second end of the return spring 9 is fixed relative to the stop ring 8. When the working state of the connecting rod 2 switches from the first state to the second state, the return spring 9 accumulates elastic potential energy under the drive of the connecting rod 2. When the working state of the connecting rod 2 switches from the second state to the first state, the elastic potential energy of the return spring 9 is released. By setting a reset spring 9, a force can be applied to the connecting rod 2 in a direction away from the measuring tube 3 when the connecting rod 2 switches from the second state to the first state. This eliminates the need for maintenance personnel to pull the connecting rod 2 by pressing the point, reducing manual labor and improving the convenience of the device.

[0071] In some possible implementations provided in this application, see [link to relevant documentation]. Figure 1 and Figure 2 As shown, the oil level measuring device for a 10kV oil conservator transformer also includes a level 10, which is mounted on the housing 1. By mounting the level 10 on the housing 1, the tilt of the oil conservator transformer can be detected, increasing the functionality of the device and improving the user experience.

[0072] Among them, the level 10 can be a level ruler, etc.

[0073] Specifically, the outer casing 1 has a slot, and the level 10 is embedded in the slot for fixation. In one embodiment, the slot extends along the length of the outer casing 1, in which case the level 10 is arranged vertically; in another embodiment, the slot extends along the tangent of the circumference of the outer casing 1, in which case the level 10 is arranged horizontally.

[0074] The oil level measuring device for a 10kV oil conservator transformer provided in the embodiments of this application, by setting a measuring tube 3 and having the measuring tube 3 extend into the outer shell 1 and cooperate with the liftable connecting rod 2, can accurately measure the distance between the oil level inside the oil conservator transformer and the transformer top cover. It can easily capture subtle changes in the oil level inside the oil conservator transformer, thereby accurately judging the oil level inside the oil conservator transformer and reducing the probability of oil conservator transformer failure.

[0075] It will be readily understood by those skilled in the art that the aforementioned advantageous methods can be freely combined and superimposed without conflict.

[0076] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application. The above are merely preferred embodiments of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this application, and these improvements and modifications should also be considered within the protection scope of this application.

Claims

1. An oil level measuring device for a 10kV oil-storage transformer, characterized in that, The device includes a housing (1), a connecting rod (2), and a measuring tube (3). The connecting rod (2) is vertically and vertically disposed inside the housing (1) and forms a protruding pressing point by penetrating one end of the housing (1) along the length direction of the housing (1). The measuring tube (3) is fixed relative to the housing (1) and is disposed at one end of the housing (1) away from the pressing point. It penetrates the housing (1) along the length direction of the housing (1) to extend into the housing (1). The working states of the connecting rod (2) include a first state and a second state. When the connecting rod (2) is in the first state, it is separated from the measuring tube (3) and the measuring tube (3) extends into the oil. When the connecting rod (2) is in the second state, it abuts against the measuring tube (3) and the connecting rod (2) is used to close the end of the measuring tube (3) away from the oil. The measuring tube (3) is marked with a scale in millimeters, and the scale increases in the direction of the measuring tube (3) toward the oil. The oil level measuring device for the 10kV oil storage tank transformer also includes a limiter (6), which includes a short side (61) and a long side (62). At least part of the short side (61) is located inside the housing (1) and is fixed relative to the measuring tube (3). The long side (62) is located on the side of the housing (1) near the oil. The long side (62) is perpendicular to the measuring tube (3). An initial scale is marked on the measuring tube (3) at a position relative to the long side (62). There is a gap between the long side (62) and the end face of the outer shell (1) for snapping on the transformer cover.

2. The oil level measuring device for a 10kV oil conservator-type transformer according to claim 1, characterized in that, The oil level measuring device for the 10kV oil storage tank transformer also includes a sealing gasket (4), which is located at one end of the connecting rod (2) near the measuring tube (3).

3. The oil level measuring device for a 10kV oil storage tank type transformer according to claim 2, characterized in that, The oil level measuring device for the 10kV oil storage tank transformer also includes a pressure spring (5), which is disposed between the connecting rod (2) and the sealing gasket (4). The first end of the pressure spring (5) is connected to the connecting rod (2), and the second end of the pressure spring (5) is fixed relative to the sealing gasket (4). When the working state of the connecting rod (2) switches from the first state to the second state, the pressure spring (5) deforms and is used to apply an elastic force to the sealing gasket (4) in the direction of the measuring tube (3).

4. The oil level measuring device for a 10kV oil conservator-type transformer according to claim 2, characterized in that, The sealing gasket (4) is made of a flexible material.

5. The oil level measuring device for a 10kV oil storage tank type transformer according to claim 1, characterized in that, The measuring tube (3) is made of transparent material.

6. The oil level measuring device for a 10kV oil conservator-type transformer according to claim 1, characterized in that, A press lock (7) is provided on the outer peripheral wall of the connecting rod (2), and a locking hole is provided on the outer shell (1). When the connecting rod (2) is switched to the second working state, the press lock (7) is inserted into the locking hole to restrict the lifting and lowering of the connecting rod (2).

7. The oil level measuring device for a 10kV oil conservator-type transformer according to claim 6, characterized in that, The connecting rod (2) includes a first section (21) and a second section (22). The first section (21) is located on the side of the second section (22) away from the measuring tube (3). The diameter of the first section (21) is larger than the diameter of the second section (22). The oil level measuring device for the 10kV oil storage tank transformer also includes a stop ring (8) and a return spring (9). The stop ring (8) is fixed relative to the outer shell (1). The projection of the stop ring (8) on the connecting rod (2) is located on the second section (22). The return spring (9) is located between the first section (21) and the stop ring (8). The first end of the return spring (9) is connected to the first section (21), and the second end of the return spring (9) is fixed relative to the stop ring (8). When the working state of the connecting rod (2) switches from the first state to the second state, the return spring (9) accumulates elastic potential energy under the drive of the connecting rod (2); when the working state of the connecting rod (2) switches from the second state to the first state, the elastic potential energy of the return spring (9) is released.

8. The oil level measuring device for a 10kV oil-storage transformer according to claim 1, characterized in that, The oil level measuring device for the 10kV oil storage tank transformer also includes a level (10), which is mounted on the outer casing (1).

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