Inverted current transformer evacuating and oiling device

Abstract

The utility model provides an inverted current transformer evacuating and oiling device, and belongs to the technical field of power transmission equipment. Comprising a transparent cylinder, an upper pressing plate and a lower pressing plate, the upper pressing plate is provided with a vacuumizing pipeline and an oil injection pipeline, the vacuumizing pipeline is connected with a vacuum system, the upper end of the oil injection pipeline is connected with an oil injection system, and the lower end of the oil injection pipeline is connected with a lower end extension pipe arranged in the transparent cylinder. The lower pressing plate is provided with a product connecting joint communicated with the transparent cylinder; when in use, the product connector is hermetically connected with an inverted current transformer base which is placed upside down; the lower-end extension tube penetrates through the lower pressing plate and is inserted into an aluminum tube of the inverted current transformer, and the outer diameter of the lower-end extension tube is smaller than the inner diameter of the aluminum tube. According to the vacuum principle that the vacuum degree of an inner cavity is low, the vacuum degree of an outer cavity is high and oil flows from the inner cavity to the outer cavity, the problem that a bubble interlayer exists in the inverted current transformer when oil is injected from the top is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of electric power transmission equipment, in particular to an inverted current transformer evacuation and oil filling device. Background Art

[0002] In the early stages, current transformers generally adopted an upright structure. However, with the rapid development of the power industry, especially in special application scenarios such as high voltage and high current, upright current transformers have gradually exposed limitations such as difficult installation and limited measurement accuracy. Inverted current transformers have emerged and gradually occupied an important position in the power system with their unique advantages. Given that inverted current transformers usually operate under high voltage environments, their insulation design must be rigorous and scientific. They must not only be able to withstand huge voltage stresses, but also have excellent insulation performance to ensure that the equipment can operate stably in various complex environments. Once the insulation design is improper or cannot withstand the corresponding voltage, the equipment faces the risk of breakdown, which may cause equipment damage, circuit interruption, and even more serious safety accidents. Therefore, the oil filling process of the inverted current transformer is particularly important.

[0003] In the conventional oil filling process, the oil is filled from the top to the bottom of the inverted current transformer, and the outer cavity of the inverted current transformer is close to the evacuation port, so its pressure is relatively small; on the contrary, the inner cavity is far away from the evacuation port, so its pressure is relatively large. This pressure difference leads to inconsistent vacuum degrees between the inner and outer cavities, where the vacuum degree of the inner cavity is relatively low, while the vacuum degree of the outer cavity is relatively high. During the top oil filling process, due to the difference in pressure and vacuum degree, bubble interlayers will inevitably appear inside the inverted current transformer, making it impossible to completely fill the inverted current transformer with oil. This not only affects the overall partial discharge test effect of the inverted current transformer, but also further reduces the pass rate of the discharge test.

[0004] Therefore, how to avoid the bubble interlayer inside the inverted current transformer during the oil filling process has become a technical problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0005] The purpose of the utility model is to provide an inverted current transformer vacuum oil filling device to overcome the defects of the inverted current transformer in the prior art that there is a bubble interlayer inside the inverted current transformer during the oil filling process, the inverted current transformer cannot be completely filled with oil, resulting in poor overall partial discharge test results and low discharge test pass rate. The inverted current transformer vacuum oil filling device provided by the utility model has the function of single product oil level control, thereby realizing full automatic control of the vacuum oil filling system.

[0006] The utility model solves the above technical problems through the following technical solutions:

[0007] An inverted current transformer vacuum oil injection device comprises a transparent cylinder, an upper pressing plate and a lower pressing plate, wherein both ends of the transparent cylinder are sealed by the upper pressing plate and the lower pressing plate; the upper pressing plate is provided with a vacuum pumping pipeline and an oil injection pipeline, the vacuum pumping pipeline is connected to a vacuum system, the upper end of the oil injection pipeline is connected to the oil injection system, and the lower end of the oil injection pipeline is connected to a lower end extension pipe arranged inside the transparent cylinder; the lower pressing plate is provided with a product connection joint connected to the transparent cylinder;

[0008] When in use, the product connection joint is sealed and connected to the base of the inverted current transformer placed upside down; the lower extension tube passes through the lower pressure plate and is inserted into the aluminum tube of the inverted current transformer, and the outer diameter of the lower extension tube is smaller than the inner diameter of the aluminum tube.

[0009] Furthermore, a tuning fork switch is inserted on the upper pressing plate, and the tuning fork switch is located inside the transparent tube.

[0010] Furthermore, the upper pressing plate and the lower pressing plate are fixed to both ends of the transparent tube by a plurality of fastening screws.

[0011] Furthermore, an oil-resistant sealing ring is provided between the upper pressing plate, the lower pressing plate and the transparent cylinder.

[0012] Furthermore, the vacuum pumping pipeline is provided with an extension tube, and is connected to the vacuum system via the extension tube.

[0013] Furthermore, an upper end extension pipe is provided at the upper end of the oil injection pipeline, and is connected to the oil injection system via the upper end extension pipe.

[0014] Furthermore, the product connection joint is provided with a connection thread for connecting an inverted current transformer.

[0015] Furthermore, the bottom of the product connection joint is higher than the top of the aluminum tube.

[0016] Furthermore, the transparent tube is a cylindrical tube.

[0017] Furthermore, the transparent tube is made of glass.

[0018] Compared with the prior art, the beneficial effects of the utility model are:

[0019] The utility model provides an inverted current transformer vacuum oiling device, comprising a transparent cylinder, an upper pressure plate, a lower pressure plate, a product connection joint, a vacuum pipeline, an oiling pipeline, and a lower end extension tube, etc. When the inverted current transformer is oiled in a vacuum oiling system, an oiling pipeline extension tube is used, and the vacuum principle that the inner cavity has a low vacuum degree and the outer cavity has a high vacuum degree, and the oil will flow from the inner cavity to the outer cavity is used to solve the problem of the existence of an air bubble interlayer inside the inverted current transformer when the inverted current transformer is oiled from the top, thereby improving the overall partial discharge test effect of the inverted current transformer and further improving the qualified rate of the discharge test.

[0020] Furthermore, the inverted current transformer vacuum oil filling device of the utility model can also be provided with a tuning fork switch, and the liquid level is measured by the tuning fork switch, which has the function of controlling the oil level of a single inverted current transformer, thereby realizing full automatic control of the vacuum oil filling system.

[0021] Furthermore, the plurality of fastening screws arranged between the upper and lower pressing plates and the oil-resistant sealing rings arranged between the upper and lower pressing plates and the transparent tube help to enhance the sealing performance inside the transparent tube.

[0022] Furthermore, the extension tubes provided on the vacuum pumping pipeline and the oil injection pipeline facilitate the connection between the vacuum pumping and oil injection device and the vacuum system and the oil injection system, thereby improving the flexibility of the device when in use.

[0023] Furthermore, the connecting thread provided on the product connection joint facilitates the installation and disassembly of the vacuum oil filling device and the inverted current transformer.

[0024] Furthermore, by setting the bottom of the product connection joint higher than the top of the aluminum tube, the oil filling process is facilitated. When the inner cavity is filled with oil, the oil can overflow along the aluminum tube and be injected into the outer cavity in time. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings in the specification are used to provide further understanding of the present invention and constitute a part of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0026] Figure 1 It is a schematic diagram of the structure of the utility model;

[0027] Figure 2 It is a connection diagram of the utility model and an inverted current transformer;

[0028] Figure 3 This is a diagram of the use state of the utility model;

[0029] Including: 1. Transparent cylinder, 2. Upper pressure plate, 3. Lower pressure plate, 4. Tuning fork switch, 5. Vacuum pipeline, 6. Product connection joint, 7. Oil filling pipeline, 8. Oil-resistant sealing ring, 9. Fastening screw, 10. Lower end extension tube; 11. Inverted current transformer, 12. Aluminum tube, 13. Inner cavity, 14. Small hole, 15. Outer cavity, 16. Base. DETAILED DESCRIPTION

[0030] See also Figure 1 and Figure 2 The utility model provides an inverted current transformer vacuum oil filling device, comprising a transparent cylinder, an upper pressure plate, a lower pressure plate, a tuning fork switch and an oil filling pipeline; both ends of the transparent cylinder are sealed by the upper pressure plate and the lower pressure plate, the upper pressure plate is provided with a vacuum connection interface connected to the transparent cylinder, the vacuum connection interface is used to connect with the vacuum system, the tuning fork switch for measuring the liquid level is installed on the upper pressure plate, the upper pressure plate is provided with an oil filling pipeline, the upper end is connected to the oil filling pipeline, the lower end is introduced into the interior of the product aluminum tube, and the outer diameter of the lower end extension tube is smaller than the inner diameter of the inverted current transformer aluminum tube; the lower pressure plate is provided with a product connection joint connected to the transparent cylinder, the upper pressure plate and the lower pressure plate are fixed at both ends of the transparent cylinder by a plurality of fastening screws, an oil-resistant sealing ring is provided between the upper pressure plate and the lower pressure plate and the transparent cylinder, the transparent cylinder is a cylindrical cylinder, the product connection joint is provided with a connecting thread, the vacuum connection interface is provided with an extension tube, which is connected to the vacuum system through the extension tube, and the oil filling pipeline is provided with an oil filling extension tube, which is connected to the oil filling system through the extension tube.

[0031] The present invention is further described in detail below in conjunction with specific embodiments, but this is not intended to limit the present invention.

[0032] Embodiment 1

[0033] Reference Figure 1 The utility model provides an inverted current transformer vacuum oiling device, comprising a transparent cylinder 1, an upper pressing plate 2 and a lower pressing plate 3, wherein both ends of the transparent cylinder 1 are sealed by the upper pressing plate 2 and the lower pressing plate 3; the upper pressing plate 2 is provided with a vacuum pipeline 5 and an oiling pipeline 7, the vacuum pipeline 5 is connected to the vacuum oiling system, the upper end of the oiling pipeline 7 is connected to the oiling system, and the lower end of the oiling pipeline 7 is connected to the lower end extension pipe 10 arranged inside the transparent cylinder 1; the lower pressing plate 3 is provided with a product connection joint 6 connected to the transparent cylinder 1;

[0034] When in use, the inverted current transformer is placed upside down, and the product connection joint 6 is sealed and connected to the base 16 of the inverted current transformer 11; the lower end extension tube 10 passes through the lower pressure plate 3 and is inserted into the aluminum tube 12 of the inverted current transformer 11, and the outer diameter of the lower end extension tube 10 is smaller than the inner diameter of the aluminum tube 12.

[0035] Reference Figure 2In this embodiment, first, the lower end extension tube 10 of the oil filling pipeline of the vacuum oil filling device is inserted into the aluminum tube 12, and then the vacuum oil filling device is sealed and connected to the inverted current transformer through the product connection joint 6, wherein the tooling height of the product connection joint 6 is 322mm and the outer diameter is 166mm. Then the vacuum pipeline 5 is connected to the vacuum system, and the upper end of the oil filling pipeline 7 is connected to the oil filling system. Before oil filling, the vacuum is first evacuated through the vacuum pipeline to provide a vacuum environment. During the oil filling process, the oil is injected into the inner cavity 13 along the aluminum tube 12 through the small hole 14. After the inner cavity is filled with oil, the oil overflows upward along the aluminum tube. After the oil overflows, it flows into the product outer cavity 15 along the outside of the aluminum tube 12 to fill the outer cavity with oil; at the same time, in a vacuum environment, the outer cavity 15 of the inverted current transformer is closer to the mouth of the vacuum pipeline, and is more susceptible to the action of the vacuum system, resulting in the rapid extraction of gas molecules inside it. According to the proportional relationship between gas pressure and molecular number density, the outer cavity 15 presents a lower pressure due to the reduction of gas molecules. On the contrary, the inner cavity 13 is far away from the vacuum line, and the number of gas molecules is relatively large, resulting in a higher pressure. When the pressure increases, the collision between gas molecules becomes more frequent, thereby reducing the vacuum degree of the inner cavity 13. Therefore, the vacuum degree of the inner cavity 13 is lower than that of the outer cavity 15.

[0036] According to the principle of vacuum mechanics, when there is a difference in vacuum between two areas, the area with a higher vacuum has a lower pressure than the area with a lower vacuum. Under the effect of this pressure difference, the injected oil tends to flow from the inner cavity 13 with a lower vacuum to the outer cavity 15 with a higher vacuum to achieve a pressure balance. In other words, the oil in the inner cavity 13 will naturally penetrate into the outer cavity 15 through the small holes on the outer shell.

[0037] When the outer cavity 15 of the inverted current transformer is also filled with oil, the oil will continue to fill the gap inside the product connection joint 6 until the oil overflows the product connection joint 6 and flows into the transparent tube 1. At this time, the operator can observe the oil filling situation based on the transparent tube 1, manually close the valve of the oil filling system, stop the oil filling, and complete the oil filling of the inverted current transformer. The process of filling the inverted current transformer with oil using this device significantly optimizes the distribution of oil, effectively solves the problem of bubble interlayers that may exist inside the inverted current transformer when the oil is filled from the top, and can ensure that the inverted current transformer is completely filled with oil, thereby greatly improving its insulation performance. This not only significantly improves the overall partial discharge test effect of the current transformer, but also further improves the pass rate of the discharge test, providing a strong guarantee for the stable and efficient operation of the power system.

[0038] Embodiment 2

[0039] Reference Figure 1A tuning fork switch 4 connected to the transparent cylinder 1 is provided on the upper pressure plate 2. The oil filling process is the same as that of the first embodiment. The difference from the first embodiment is that, since the inner diameter of the aluminum tube 12 is much larger than the outer diameter of the lower extension tube 10, when the outer cavity is filled with oil, the oil overflows upward into the transparent cylinder 1. When the oil level in the transparent cylinder 1 rises to the tuning fork switch 4, the oil filling system will automatically close the valve of the oil filling system, that is, stop the oil filling. By setting the tuning fork switch, the vacuum oil filling device of the inverted current transformer has the function of controlling the oil level of a single product, thereby realizing the full automatic control of the vacuum oil filling system.

[0040] Preferably, the upper pressing plate 2 and the lower pressing plate 3 are provided with multiple fastening screws 9 fixed at both ends of the transparent tube 1; preferably, an oil-resistant sealing ring 8 is provided between the upper pressing plate 2 and the lower pressing plate 3 and the transparent tube 1. The above preferred scheme helps to enhance the sealing performance inside the transparent tube.

[0041] Preferably, the vacuum pumping pipeline 5 is provided with an extension tube, which is connected to the vacuum system through the extension tube; preferably, the upper end of the oil filling pipeline 7 is provided with an upper end extension tube, which is connected to the oil filling system through the upper end extension tube. Through the above preferred scheme, it is convenient to connect the vacuum pumping and oil filling device with the vacuum system and the oil filling system, thereby improving the flexibility of the device when used.

[0042] Preferably, the product connection joint 6 is provided with a connection thread for connecting the inverted current transformer, which is helpful for the installation and removal of the evacuation and oil filling device and the inverted current transformer.

[0043] Preferably, the bottom of the product connection joint 6 is higher than the top of the aluminum tube 12, which helps to speed up the oil filling process. When the inner cavity is filled with oil, it is convenient for the oil to overflow along the aluminum tube and be injected into the outer cavity in time.

[0044] Preferably, the transparent tube 1 is a cylindrical tube; preferably, the transparent tube 1 is made of glass.

[0045] The above content is a further detailed description of the utility model in combination with a specific preferred implementation method. It cannot be determined that the specific implementation methods of the utility model are limited to this. For ordinary technicians in the technical field to which the utility model belongs, they can make several simple deductions or substitutions without departing from the concept of the utility model, which should be regarded as belonging to the utility model and the scope of patent protection determined by the submitted claims.

Claims

1. An inverted current transformer evacuation and oil filling device, characterized in that: It comprises a transparent cylinder (1), an upper pressing plate (2) and a lower pressing plate (3), wherein both ends of the transparent cylinder (1) are sealed by the upper pressing plate (2) and the lower pressing plate (3); the upper pressing plate (2) is provided with a vacuum pumping pipeline (5) and an oil injection pipeline (7), wherein the vacuum pumping pipeline (5) is connected to a vacuum system, the upper end of the oil injection pipeline (7) is connected to the oil injection system, and the lower end of the oil injection pipeline (7) is connected to a lower extension pipe (10) arranged inside the transparent cylinder (1); the lower pressing plate (3) is provided with a product connection joint (6) which is connected to the transparent cylinder (1); When in use, the product connection joint (6) is sealedly connected to the base (16) of the inverted current transformer (11) placed in an inverted position; the lower end extension tube (10) passes through the lower pressure plate (3) and is inserted into the aluminum tube (12) of the inverted current transformer (11), and the outer diameter of the lower end extension tube (10) is smaller than the inner diameter of the aluminum tube (12).

2. The inverted current transformer evacuation and oil filling device according to claim 1, characterized in that: A tuning fork switch (4) is inserted into the upper pressing plate (2), and the tuning fork switch (4) is located inside the transparent cylinder (1).

3. The inverted current transformer evacuation and oil filling device according to any one of claims 1 to 2, characterized in that: The upper pressing plate (2) and the lower pressing plate (3) are fixed to the two ends of the transparent cylinder (1) via a plurality of fastening screws (9).

4. The inverted current transformer evacuation and oil filling device according to claim 3, characterized in that: An oil-resistant sealing ring (8) is provided between the upper pressing plate (2), the lower pressing plate (3) and the transparent cylinder (1).

5. The inverted current transformer evacuation and oil filling device according to any one of claims 1 to 2, characterized in that: The vacuum extraction pipeline (5) is provided with an extension pipe and is connected to the vacuum system via the extension pipe.

6. The inverted current transformer evacuation and oil filling device according to any one of claims 1 to 2, characterized in that: An upper end extension pipe is provided at the upper end of the oil injection pipeline (7), and is connected to the oil injection system via the upper end extension pipe.

7. The inverted current transformer evacuation and oil filling device according to any one of claims 1 to 2, characterized in that: The product connection joint (6) is provided with a connection thread and is used for connecting an inverted current transformer (11).

8. The inverted current transformer evacuation and oil filling device according to any one of claims 1-2, characterized in that: The bottom of the product connection joint (6) is higher than the top of the aluminum tube (12).

9. The inverted current transformer evacuation and oil filling device according to any one of claims 1 to 2, characterized in that: The transparent tube (1) is a cylindrical tube.

10. The inverted current transformer evacuation and oil filling device according to any one of claims 1 to 2, characterized in that: The transparent tube (1) is made of glass.

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