Embedded pole of ring main unit

Abstract

An incoming and outgoing line end and a vacuum arc-extinguishing chamber are arranged on the same straight line, the other end of a solid-sealed polar pole body is provided with an L-shaped epoxy resin pouring solid-sealed insulating part, an insulating pull rod is directly connected with the moving end of the vacuum arc-extinguishing chamber, and the upper end of the solid-sealed polar pole, the static end of the vacuum arc-extinguishing chamber and a copper conductor are connected with a static contact; after the scheme is adopted, the integral structure integration of the mechanical strength, the electrical insulation performance and the heat dissipation performance can be realized in a compact space.

Description

Technical Field

[0001] This utility model relates to a ring main unit, specifically a solid-sealed pole used in a ring main unit. Background Technology

[0002] In medium-voltage switchgear, solid-sealed poles are widely used in vacuum circuit breakers and vacuum load switches to provide external insulation and support for the vacuum interrupter. Solid-sealed poles are manufactured by pouring epoxy resin into a preheated mold containing the vacuum interrupter, using an APG casting process. Solid-sealed poles completely isolate the vacuum interrupter and other conductive components from the external environment, preventing damage from external forces and the environment, and enhancing insulation strength. Solid-sealed poles also significantly reduce manual assembly work, minimizing potential errors during the assembly process.

[0003] Traditional solid-sealed pole structures on the market typically have the upper and lower inlet / outlet terminals vertically connected to the vacuum interrupter. The upper end connects to the stationary contact of the vacuum interrupter, while the lower end is cast into the cylindrical wall of the solid-sealed pole and connected to the moving end of the pole via a flexible connector. A threaded insert for installation is located on the lower end face of the pole. This type of solid-sealed pole offers excellent performance, but its structure is primarily suited for center-mounted switchgear. It cannot be used in specially designed switchgear or ring main units. Furthermore, these units require sensors to display high-voltage live signals, but smaller ring main units cannot accommodate individual sensors. Utility Model Content

[0004] The purpose of this invention is to provide a solid-sealed pole with complete structure and function and that meets the requirements for electrical insulation.

[0005] To achieve the above objectives, this utility model provides a solid-sealed pole for a ring main unit. The pole body is made of epoxy resin, and a vacuum interrupter is disposed within the epoxy resin-sealed pole body, comprising the epoxy resin body and the internal vacuum interrupter. The inlet and outlet terminals are aligned with the vacuum interrupter, which is located outside the epoxy resin. At the upper end of the solid-sealed pole, an insulating pull rod is directly connected to the flexible connector and the moving end of the vacuum interrupter. At the upper end of the solid-sealed pole, there is a threaded insert for fixing the copper busbar. At the lower end of the solid-sealed pole… The stationary end of the vacuum interrupter is directly connected to the copper conductor. Each phase has four fixed post threaded inserts on the end face of the solidified pole, which can fix the solidified pole to the support mounting plate. A copper post insert is provided at the lower end of the solidified pole body. A square epoxy resin cast insulating part is provided between the copper post insert and the solidified pole body. An L-shaped epoxy resin cast solidified insulating part is provided at the other end of the solidified pole body. The insulating pull rod is directly connected to the moving end of the vacuum interrupter. At the upper end of the solidified pole, the stationary end of the vacuum interrupter is connected to the copper conductor as a stationary contact.

[0006] A sensor wiring threaded insert is fitted onto the copper pillar insert. The sensor wiring threaded insert contains a mesh internal sensor, which can lead out the high-voltage live signal from inside the cabinet to the live display.

[0007] By adopting the above solution, this utility model can ensure mechanical strength and electrical insulation performance in a compact space. The L-shaped epoxy resin cast and sealed insulation component is heightened, the safety distance is increased, the reliability is improved, and the heat dissipation performance is integrated into the entire structure. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the structure of the utility model;

[0009] Figure 2 This is a schematic diagram of the structure of this utility model from below;

[0010] Figure 3 This is the top view of the structure of this utility model.

[0011] Label Explanation:

[0012] 1. Solidified pole body; 2. Long L-shaped epoxy resin cast solidified insulation component; 3. Cable contact; 4. Stationary contact; 5. Vacuum interrupter; 6. Threaded insert for fixed flexible connection mechanism; 7. Square epoxy resin cast insulation component; 8. Fixed support insert; 9. Internal sensor; 10. Sensor wiring threaded insert Detailed Implementation

[0013] To explain in detail the technical content, structural features, objectives and effects of this utility model, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0014] Please see Figure 1 as well as Figure 2 , 3This utility model relates to a ring main unit with a solid-sealed pole, comprising a cylindrical solid-sealed pole body 1 and a vacuum interrupter 5 disposed within it. The vacuum interrupter 5 can be a vacuum circuit breaker or a vacuum load switch. The inlet and outlet terminals of the vacuum interrupter 5 are aligned with the vacuum interrupter 5. A moving cable contact 3 is located at one end of the solid-sealed pole body 1. A ring of square epoxy resin cast insulation 7 is provided between the cable contact 3 and the solid-sealed pole body to ensure sufficient creepage distance of live parts and prevent surface discharge of live parts on the surface of the solid-sealed pole. Four fixing support inserts 8 are provided on the side of the solid-sealed pole body 1 to fix the solid-sealed pole to the support beams on both sides of the ring main unit. The other end of the solid-sealed pole body 1 is provided with a long L-shaped epoxy resin cast solid-sealed insulation 2, which has two side insulating sheets to strengthen the support and ensure that the voltage at the inlet and outlet terminals does not discharge surfacely when the vacuum interrupter is in the open state. At the upper end of the solid-sealed pole body 1, there is a threaded insert 6 on the upper end face of the fixed copper busbar, and a threaded insert for fixing the flexible connection mechanism, which connects the vacuum interrupter to the stationary contact.

[0015] A sensor wiring threaded insert 10 is fitted onto cable contact 3. The sensor wiring threaded insert 10 contains a mesh internal sensor, which can lead the high-voltage live signal from inside the cabinet to the live display. The insulating pull rod is directly connected to the moving end of the vacuum interrupter (not shown in the figure).

[0016] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent shape or structural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A sealed terminal block for a ring main unit, wherein the terminal block body is made of epoxy resin, and a vacuum interrupter is disposed within the epoxy resin sealed terminal block body, comprising an epoxy resin body and an internal vacuum interrupter, characterized in that: The incoming and outgoing lines are aligned with the vacuum interrupter. The incoming and outgoing lines are located outside the epoxy resin. At the upper end of the solidified pole, the insulating rod is directly connected to the soft connection and the moving end of the vacuum interrupter. At the upper end of the solidified pole, there is a threaded insert for fixing the copper busbar. At the lower end of the solidified pole, the stationary end of the vacuum interrupter is directly connected to the copper conductor. Each phase of the end face of the solidified pole has four threaded inserts for fixing the pole to the support mounting plate. A copper column insert is located at the lower end of the solidified pole body. A square epoxy resin cast insulating part is provided between the copper column insert and the solidified pole body. An L-shaped epoxy resin cast solidified insulating part is provided at the other end of the solidified pole body. The insulating rod is directly connected to the moving end of the vacuum interrupter. At the upper end of the solidified pole, the stationary end of the vacuum interrupter is connected to the copper conductor as a stationary contact.

2. The ring main unit solid-sealed pole as described in claim 1, characterized in that: A sensor wiring threaded insert is fitted onto the copper pillar insert. The sensor wiring threaded insert contains a mesh internal sensor, which can lead out the high-voltage live signal from inside the cabinet to the live display.

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