Novel inclined sleeve structure for 126kV GIS (Gas Insulated Switchgear)

Abstract

A novel inclined sleeve structure for a 126kV GIS is characterized in that the upper part of a transition tank body is provided with three flange ports, each flange port is provided with an insulating sleeve, and the installation angle of the three insulating sleeves and the vertical direction form an angle of 30 degrees or 60 degrees; three conductors are arranged in the transition tank body, each conductor is formed by integrally casting a contact and a bent rod conductor, the three conductors are respectively arranged along the axes of the three flange ports, and a guide piece is arranged at the upper end of each conductor; a conducting rod is arranged in the insulating sleeve, one end of the conducting rod is installed in a contact of the conductor through a guide piece in the axis direction of the insulating sleeve, and the other end of the conducting rod is fixedly installed on a conducting end cover at the end of the insulating sleeve through a disc spring and a bolt. Through the structure, the utility model provides the novel inclined sleeve structure for the 126kV GIS, which can reduce the equipment size, reduce the equipment cost and reduce the manufacturing cost of a transformer substation.

Description

Technical Field

[0001] The utility model relates to the technical field of high-voltage switch transmission equipment, in particular to a novel inclined bushing structure for 126kV GIS. Background Art

[0002] At the beginning of the 21st century, to meet the needs of the power system, especially the construction of ultra-high voltage substations and the renovation and expansion of urban grid substations, after decades of continuous research, improvement, and development, modular and miniaturized structural design enabled the 126kV GIS to achieve full three-phase co-enclosure and whole-bay transportation, realizing the power sector's long-standing desire for simplicity, flexibility, economy, and reliability.

[0003] 126kV GIS is renowned for its compact design. In recent years, HGIS has also gained significant popularity among design and operation departments. HGIS offers a high cost-performance ratio and meets the power sector's requirements for a new, outdoor, simple, and reliable enclosed SF6 gas-insulated switchgear. In the HGIS product structure, sufficient safety margins must be maintained within the insulation distance of the bushing to ensure safe operation and meet relevant test standards. This results in the bushing occupying a significant portion of the overall product structure. The use of angled bushings makes the overall miniaturized product structure even more compact, reducing equipment and substation costs, and thus possessing broad practical application value. Summary of the Invention

[0004] The purpose of the utility model is to provide a new type of inclined bushing structure for 126kV GIS which has a reasonable structure, is safe and reliable, is easy to repair and maintain, and has high application value.

[0005] To solve the above technical problems, the technical solution of the utility model is: a new inclined bushing structure for 126kV GIS, characterized in that: three flange openings are provided on the upper part of the transition tank body, and an insulating bushing is installed on each flange opening, and the installation angle of the three insulating bushings is 30° or 60° to the vertical direction; three conductors are provided inside the transition tank body, and the conductors are integrally cast with contacts and bent rod conductors. The three conductors are respectively arranged along the axes of the three flange openings, and the upper ends of the conductors are provided with guides; a conductive rod is provided inside the insulating bushing, and one end of the conductive rod is installed in the contact of the conductor through a guide along the axis direction of the insulating bushing, and the other end is fixed to the conductive end cover at the end of the insulating bushing by a disc spring and bolts.

[0006] A shielding cover is provided inside the insulating sleeve at one end close to the transition tank body, and the conductive rod passes through the shielding cover and is installed and connected with the upper contact of the conductor.

[0007] The three conductors are three-phase conductors.

[0008] The conductor lower contact is fixed on the basin-type insulator by means of bolts.

[0009] The transition tank body is provided with an explosion-proof device, which is fixed to the transition tank body through a compression flange and a sealing ring.

[0010] The upper portion of the insulating sleeve is fixed to the conductive end cover through a flange via a sealing ring and electro-galvanized bolts, and the lower portion of the insulating sleeve is connected to the transition tank body through a flange.

[0011] The beneficial effects of the utility model are:

[0012] Compared with the original straight bushing, the new inclined bushing structure for 126kV GIS provided by the utility model effectively reduces the insulation distance between the charged point of the bushing and the surrounding objects, improves the safety margin, reduces the overall size of the 126kV GIS equipment, reduces equipment costs, and reduces the cost of substations, and has high application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1a This is a schematic diagram of the 30° inclined casing assembly;

[0014] Figure 1b This is a schematic diagram of the 60° inclined casing assembly;

[0015] Figure 2 1 is a schematic cross-sectional view of the inclined casing structure;

[0016] Figure 3 It is a schematic diagram of the transition tank structure;

[0017] Figure 4 It is a schematic diagram of the internal conductor;

[0018] Figure 5 It is the application of inclined casing in actual engineering. DETAILED DESCRIPTION

[0019] A novel inclined bushing structure for 126kV GIS systems features three flanges on the upper portion of the transition tank (1), each fitted with an insulating bushing (2). The upper portion of the insulating bushing (2) is secured to the conductive end cap (6) via flanges using sealing rings and electro-galvanized bolts. The lower flanges of the insulating bushings (2) are connected to the transition tank (1). The three insulating bushings (2) are installed at an angle of 30° or 60° to the vertical. This alters the existing transition tank structure and the orientation of the three flanges on the tank that connect to the insulating bushings, allowing the insulating bushings to be aligned at an angle of 30° or 60° to the vertical after docking with the transition tank. This design meets diverse user space requirements and offers a wide range of practical applications. Within the transition tank (1), three three-phase conductors (3) are housed. The conductors (3) are integrally cast with the contacts and bent rod conductors. The three conductors (3) are arranged along the axes of the three flanges. Guides (4) are located at the upper ends of the conductors (3). The lower contacts (3) and the pot insulators (3) are connected to the GIS equipment via contact assembly. A conductive rod 5 is installed inside the insulating sleeve 2. One end of the conductive rod 5 is installed within the contact of the conductor 3 via a guide 4 along the axis of the insulating sleeve 2. The other end is secured to a conductive end cap 6 at the end of the insulating sleeve 2 via a disc spring and bolts. This structure offers a rational overall structure, flexible assembly, and easy maintenance, making it widely applicable to miniaturized GIS and HGIS products.

[0020] Preferably, a shielding cover 7 is provided inside the insulating sleeve 2, near one end of the transition tank body 1, and the conductive rod 5 passes through the shielding cover 7 and is installed and connected to the upper contact of the conductor 3. The shielding cover 7 effectively reduces the end field strength, avoids corona discharge, and increases the breakdown voltage of the sleeve end to the shell.

[0021] Preferably, an explosion-proof device 8 is provided on the transition tank body 1, and the explosion-proof device 8 is fixed to the transition tank body 1 through a clamping flange and a sealing ring. The clamping flange presses the explosion-proof membrane into one body, and the adsorbent cover is placed inside the tank body, which is safe and reliable.

Claims

1. A new type of inclined bushing structure for 126kV GIS, characterized by: The upper part of the transition tank body (1) is provided with three flange openings, each flange opening is provided with an insulating sleeve (2), and the installation angle of the three insulating sleeves (2) is 30° or 60° with respect to the vertical direction; three conductors (3) are provided inside the transition tank body (1), and the conductors (3) are formed by integrally casting the contacts and the bent rod conductors. The three conductors (3) are respectively arranged along the axes of the three flange openings, and the upper ends of the conductors (3) are provided with guide members (4); a conductive rod (5) is provided inside the insulating sleeve (2), and the conductive rod (5) is installed in the contact of the conductor (3) through the guide member (4) along the axis direction of the insulating sleeve (2), and the other end is fixed to the conductive end cover (6) at the end of the insulating sleeve (2) through a disc spring and a bolt.

2. The novel 126kV GIS inclined bushing structure according to claim 1 is characterized in that: A shielding cover (7) is provided inside the insulating sleeve (2) at one end close to the transition tank (1), and the conductive rod (5) passes through the shielding cover (7) and is installed and connected with the upper contact of the conductor (3).

3. The novel 126kV GIS inclined bushing structure according to claim 1 is characterized in that: The three conductors (3) are three-phase conductors.

4. The novel 126kV GIS inclined bushing structure according to claim 1 is characterized in that: The lower contact of the conductor (3) is fixed to the basin-type insulator by means of bolts.

5. The novel 126kV GIS inclined bushing structure according to claim 1 is characterized in that: The transition tank body (1) is provided with an explosion-proof device (8), which is fixed to the transition tank body (1) via a compression flange and a sealing ring.

6. The novel 126kV GIS inclined bushing structure according to claim 1 is characterized in that: The upper portion of the insulating sleeve (2) is fixed to the conductive end cover (6) via a flange through a sealing ring and electrogalvanized bolts, and the lower flange of the insulating sleeve (2) is connected to the transition tank body (1).

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