Improved secondary lead pipe connecting structure of high-pressure gas current transformer

Abstract

The utility model relates to the technical field of high-pressure gas current transformers, and discloses an improved secondary lead tube connecting structure of a high-pressure gas current transformer, which comprises a shell, an anti-explosion sheet arranged at the top of the shell, a primary wiring terminal arranged on the outer side of the shell, and a primary series-parallel connection terminal arranged below the primary wiring terminal. An insulating support is arranged at the bottom of the shell, a novel secondary lead pipe is arranged in the insulating support, a secondary lead is connected in the novel secondary lead pipe, a sealed secondary wiring board is connected to the bottom of the secondary lead, a pressing ring is arranged at the bottom of the sealed secondary wiring board, and the sealed secondary wiring board is connected with an external secondary lead. And the external secondary lead is connected with an external secondary wiring board. By optimizing the connecting structure of the secondary lead tube, the sealing performance and the stability of equipment are remarkably improved, and the problems of gas leakage and insulation performance reduction are effectively prevented. Meanwhile, due to the design of the novel structure, the installation process is simpler and more convenient, and damage and maintenance cost caused by improper installation are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of high-voltage gas current transformers, and particularly to an improved connection structure of the secondary lead pipe of a high-voltage gas current transformer. Background Art

[0002] Due to its excellent insulation performance, SF6 gas is used in the insulation of current transformers. Compared with oil-immersed paper-insulated current transformers, SF6 current transformers have multiple advantages such as mature and stable technology, reliable performance, safety, short production cycle, no oil leakage, simple operation and maintenance, and rich experience, so they are deeply favored by power users. However, it also has significant drawbacks. First of all, SF6 gas is one of the six greenhouse gases. It is difficult to decompose, has a long lifespan, and has a high global warming potential of up to 23,900, posing a huge potential threat to the greenhouse effect. Therefore, strict control over the emission of SF6 gas is required. Secondly, the liquefaction temperature of SF6 gas is relatively high, which limits its use in alpine regions. Especially in an environment with high pressure and low temperature, SF6 gas is prone to liquefaction, resulting in a rapid decline in insulation performance. These two major drawbacks indicate that the usage amount of SF6 current transformers may gradually decrease.

[0003] Currently, two new products are being developed in China. One is a mixed-gas-insulated current transformer, in which SF6 is mixed with N2, CO2, CF4, or air, etc.; the other is a clean-air-insulated current transformer. However, since the insulation performance of both SF6 mixed gas and clean air is lower than that of pure SF6 gas, in order to ensure the insulation performance, it is necessary to increase the insulation distance and raise the gas pressure. In particular, the pressure of clean-air insulation needs to be increased more.

[0004] For SF6 gas-insulated current transformers, the sealing performance has always been a major challenge. Since gas leakage is inevitable, with the increase in pressure, the original sealing structure of the product may cause a significant increase in the gas leakage rate, making sealing more difficult. Therefore, improving the existing structure, reducing potential leakage links, and significantly enhancing the sealing performance of the product are the keys to ensuring that the new product does not affect the insulation performance due to the pressure drop caused by leakage. In addition, the secondary wiring board in the original structure, which is used for wiring the user's secondary measurement and protection devices, directly participates in the design of the product seal. During the installation process, the threads may be damaged due to excessive torque, and it is often impossible to replace them on-site, resulting in costly factory repairs.

[0005] Therefore, based on the above technical problems, it is necessary for those skilled in the art to develop an improved connection structure of the secondary lead pipe of a high-voltage gas current transformer. Content of the Utility Model

[0006] The purpose of the present utility model is to provide an improved connection structure for the secondary lead pipe of a high-voltage gas current transformer to solve the problems raised in the above-mentioned background technology.

[0007] To achieve the above purpose, the present utility model provides the following technical solutions:

[0008] A technical solution for an improved connection structure of the secondary lead pipe of a high-voltage gas current transformer, including a housing, a base flange is provided at the bottom of the housing, a rupture disc is provided at the top of the housing, a primary wiring terminal is provided on the outer side of the housing, a primary series-parallel terminal is provided below the primary wiring terminal, an insulating support is provided at the bottom of the housing, a new type of secondary lead pipe is provided inside the insulating support, a secondary lead is connected inside the new type of secondary lead pipe, the bottom of the secondary lead is connected to a sealed secondary wiring board, a compression ring is provided at the bottom of the sealed secondary wiring board, an external secondary lead is connected to the sealed secondary wiring board, and an external secondary wiring board is connected to the external secondary lead.

[0009] As a preferred technical solution, an insulating gas cavity is provided between the new type of secondary lead pipe and the insulating support, and the insulating gas cavity is used to fill insulating gas.

[0010] As a preferred technical solution, an adsorbent is filled between the sealed secondary wiring board and the new type of secondary lead pipe.

[0011] As a preferred technical solution, an O-ring seal is provided between the base flange and the sealed secondary wiring board, and the O-ring seal is used to enhance the sealing performance of the structure.

[0012] As a preferred technical solution, the sealed secondary wiring board is tightly sealed and fixed to the base flange by bolts through a compression ring.

[0013] As a preferred technical solution, the rupture disc is made of a special alloy material and structure, has excellent explosion-proof performance, and can rupture in time when the pressure abnormally increases caused by internal faults of the high-voltage gas current transformer, preventing equipment damage.

[0014] As a preferred technical solution, the housing is made of high-strength aluminum alloy material, having excellent explosion-proof and sealing performance.

[0015] Compared with the prior art, the beneficial effects of the present utility model are:

[0016] The utility model relates to an improved connection structure of the secondary lead pipe of a high-voltage gas current transformer. By optimizing the connection structure of the secondary lead pipe, the sealing performance and stability of the equipment are significantly improved, effectively preventing problems such as gas leakage and deterioration of insulation performance. At the same time, the design of the new structure makes the installation process more convenient, reducing damage and maintenance costs caused by improper installation.

[0017] The utility model relates to an improved connection structure of the secondary lead pipe of a high-voltage gas current transformer. By adding a secondary wiring board that does not participate in sealing, when the secondary wiring screw is damaged during user installation, it can be quickly replaced at the construction site without returning to the factory to replace the secondary wiring board that participates in sealing.

[0018] The utility model effectively reduces the internal volume of the product and the content of SF6 in the mixed gas by removing the metal sealing tank inside the product base, and can effectively reduce the emission of SF6 under the same leakage rate.

[0019] The utility model relates to an improved connection structure of the secondary lead pipe of a high-voltage gas current transformer, which can significantly reduce the number of welds, thereby improving the overall sealing performance. In addition, it can also reduce the labor intensity during the construction process and improve the installation and use efficiency. Description of the Drawings

[0020] Figure 1 It is a schematic diagram of the overall structure of an improved connection structure of the secondary lead pipe of a high-voltage gas current transformer;

[0021] Figure 2 It is a schematic diagram of the partial structure of an improved connection structure of the secondary lead pipe of a high-voltage gas current transformer.

[0022] In the reference numerals of the drawings: 1. housing; 11. explosion-proof film; 12. primary series-parallel terminals; 13. primary wiring terminal; 2. insulating pillar; 21. new secondary lead pipe; 22. secondary lead; 23. insulating gas chamber; 24. sealed secondary wiring board; 25. pressure ring; 26. adsorbent; 27. external secondary lead; 28. external secondary wiring board; 3. base flange. Detailed Embodiments

[0023] The features and exemplary embodiments of various aspects of the present utility model will be described in detail below. In order to make the objectives, technical solutions and advantages of the present utility model clearer, the following further describes the present utility model in detail with reference to the accompanying drawings and specific embodiments. For those skilled in the art, the present utility model can be implemented without some of these specific details. The following description of the embodiments is only to provide a better understanding of the present utility model by showing examples of the present utility model. Embodiment

[0024] As Figure 1 , Figure 2 shown, the utility model provides an improved technical solution for the connection structure of the secondary lead pipe of a high-voltage gas current transformer: including a housing 1, a base flange 3 is arranged at the bottom of the housing 1, the housing 1 is made of high-strength aluminum alloy material, with excellent explosion-proof and sealing performance, an explosion-proof film 11 is arranged at the top of the housing 1, the explosion-proof film 11 is made of special alloy material and structure, with excellent explosion-proof performance, and can rupture in time when the pressure abnormally increases caused by internal faults of the high-voltage gas current transformer, preventing equipment damage. A primary wiring terminal 13 is arranged on the outside of the housing 1, a primary series-parallel terminal 12 is arranged below the primary wiring terminal 13, an insulating support 2 is arranged at the bottom of the housing 1, a new type of secondary lead pipe 21 is arranged inside the insulating support 2, an insulating gas cavity 23 is arranged between the new type of secondary lead pipe 21 and the insulating support 2, and the insulating gas cavity 23 is used to fill insulating gas. A secondary lead 22 is connected inside the new type of secondary lead pipe 21, the bottom of the secondary lead 22 is connected with a sealed secondary wiring board 24, an adsorbent 26 is filled between the sealed secondary wiring board 24 and the new type of secondary lead pipe 21, a pressure ring 25 is arranged at the bottom of the sealed secondary wiring board 24, and the sealed secondary wiring board 24 is tightly sealed and fixed on the base flange 3 by bolts through the pressure ring 25. The sealed secondary wiring board 24 is connected with an external secondary lead 27, an O-ring seal is arranged between the base flange 3 and the sealed secondary wiring board 24, the O-ring seal is used to enhance the sealing performance of the structure, and the external secondary lead 27 is connected with an external secondary wiring board 28.

[0025] According to the above scheme, in this embodiment, during use, the high-voltage gas current transformer is installed in an appropriate position, connected to an external power supply through the primary wiring terminal 13, and the series-parallel control of the current is carried out through the primary series-parallel terminal 12. When the high-voltage gas current transformer is working, the insulating gas in the insulating gas cavity 23 can effectively isolate the electrical components inside the current transformer from the external environment, ensuring the safe and stable operation of the equipment. At the same time, the adsorbent 26 can absorb the moisture and impurities entering the insulating gas cavity 23, ensuring the purity and insulation performance of the insulating gas.

[0026] When secondary wiring is required, the external secondary lead 27 is connected to the sealed secondary wiring board 24 and connected to external equipment through the external secondary wiring board 28. Since the external secondary wiring board 28 does not participate in the sealing, during the wiring process, even if problems such as damage to the terminal screw occur, there is no need to deflate and repair the entire high-voltage gas current transformer, and only the terminal screw on the external secondary wiring board 28 needs to be replaced, greatly saving the maintenance time and cost.

[0027] In addition, due to the design of the new secondary lead tube 21, the desiccant is placed in the lead tube wall at the lower end of the insulating sleeve, removing the metal seal tank in the original structure, thus eliminating a large number of welds, greatly reducing the probability of leakage, and improving the sealing performance of the product. At the same time, by reducing the internal volume of the product and the content of SF6, the emission of SF6 is reduced, which is beneficial to environmental protection and sustainable development.

[0028] In summary, the improved secondary lead tube connection structure technical solution of the high-voltage gas current transformer provided by the present utility model has excellent insulation performance, explosion-proof performance, sealing performance and environmental protection performance, can effectively solve the problems existing in the prior art, improve the reliability and service life of the equipment, and has broad application prospects and market prospects.

[0029] The working principle and usage process of the present utility model: After the components of this solution are assembled in sequence, work according to the above-mentioned embodiments in sequence according to actual needs, and these are all the working steps.

[0030] The above is only a preferred specific embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution of the present utility model and its inventive concept, makes equivalent substitutions or changes, and should be covered by the protection scope of the present utility model.

[0031] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inner", "front", "center", "both ends", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present utility model.

[0032] In the present utility model, unless otherwise clearly defined and limited, the terms "installation", "setting", "connection", "fixation", "swivel connection", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, for those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0033] In accordance with the embodiments of the present utility model as described above, these embodiments do not describe all the details in detail, nor do they limit the utility model to only the specific embodiments. Obviously, many modifications and variations can be made according to the above description. The present specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present utility model, so that those skilled in the art can make good use of the present utility model and its modified use based on the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. An improved high-voltage gas current transformer secondary lead tube connection structure, characterized in that: The invention comprises a shell (1), wherein a base flange (3) is arranged at the bottom of the shell (1), an explosion-proof disk (11) is arranged at the top of the shell (1), a primary wiring terminal (13) is arranged outside the shell (1), a primary series-parallel terminal (12) is arranged below the primary wiring terminal (13), an insulating pillar (2) is arranged at the bottom of the shell (1), a new type of secondary lead tube (21) is arranged inside the insulating pillar (2), a secondary lead (22) is connected inside the new type of secondary lead tube (21), a sealed secondary wiring board (24) is connected at the bottom of the secondary lead (22), a pressure ring (25) is arranged at the bottom of the sealed secondary wiring board (24), an external secondary lead (27) is connected to the sealed secondary wiring board (24), and the external secondary lead (27) is connected to the external secondary wiring board (28).

2. The improved high-voltage gas current transformer secondary lead tube connection structure according to claim 1 is characterized in that: An insulating gas cavity (23) is provided between the novel secondary lead tube (21) and the insulating support pillar (2), and the insulating gas cavity (23) is used to be filled with insulating gas.

3. The improved high-voltage gas current transformer secondary lead tube connection structure according to claim 1 is characterized in that: A material filled with an adsorbent (26) is provided between the sealed secondary wiring board (24) and the novel secondary lead tube (21).

4. The improved high-voltage gas current transformer secondary lead tube connection structure according to claim 1 is characterized in that: An O-shaped sealing ring is provided between the base flange (3) and the sealed secondary terminal board (24), and the O-shaped sealing ring is used to enhance the sealing performance of the structure.

5. The improved high-voltage gas current transformer secondary lead tube connection structure according to claim 1 is characterized in that: The sealed secondary terminal board (24) is fixed to the base flange (3) by means of a pressure ring (25) and compressed and sealed by bolts.

6. The improved high-voltage gas current transformer secondary lead tube connection structure according to claim 1, characterized in that: The housing (1) is made of high-strength aluminum alloy material and has excellent explosion-proof and sealing properties.

Images