Three-phase common-box GIL branch unit

Abstract

The utility model discloses a three-phase common-box GIL branch unit, which comprises a tubular shell, a conductor assembly is arranged in the shell, the conductor assembly is fixed on a flange at one end of the shell through a basin-type insulator bolt, and a cover plate assembly is arranged on a flange at the other end of the shell; the conductor assembly comprises three conductors which are fixed on the basin-type insulator through bolts, and each conductor is provided with a branch conductor; and the side wall of the shell is also provided with a plurality of branch cylinders which can be used for assembling branch conductor outgoing lines and an access cover plate for installing the access cover plate. The three-phase conductor in the device adopts an integrated structure, and the conductor is fixedly assembled with one end of the basin-type insulator, so that the structure is simple, the number of parts is small, and the manufacturing cost is effectively reduced; in the installation and use process, the conductor assembly is integrally pushed into the shell, so that the installation difficulty is reduced, and the production efficiency is improved; meanwhile, the outer side of the basin-type insulator is provided with the contact seat assembly, and the assembly is simple and convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of high-voltage power transmission and transformation, in particular to a three-phase common box GIL branch unit. Background Art

[0002] Rigid gas-insulated transmission lines (GIL) have the advantages of large transmission capacity, high safety performance and long service life. They have been widely used in urban underground power transmission, steel, chemical industry and new energy fields.

[0003] GIL is divided into two types according to the distribution of conductors: three-phase conductor common box and three-phase conductor separate box. GIL transmission system usually adopts the combination of three-phase conductor common box and three-phase conductor separate box. The three-phase conductor common box structure is mainly used for the power transmission of the main busbar, and the three-phase conductor separate box structure is mainly used for the power distribution of different output ends. The overall structure can achieve the engineering construction goals of small footprint, compact structure and low comprehensive cost.

[0004] The conversion unit of three-phase conductor common box and three-phase conductor split box is the key to GIL transmission system. The common GIL three-phase conductor conversion unit has a complex structure, many parts, and the assembly process is not easy to control. In actual engineering use, the branch unit is a small-volume air chamber, and it is generally necessary to add a gas connection device to connect the three-phase branch with the phase split unit, which increases the cost of use and the risk of gas leakage. Therefore, a three-phase common box GIL branch unit is proposed. Utility Model Content

[0005] The utility model aims to solve the shortcomings in the prior art and proposes a three-phase common box GIL branch unit.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A three-phase common box GIL branch unit comprises a tubular shell, in which a conductor assembly is installed, the conductor assembly is fixed to a flange at one end of the shell by means of pot-type insulator bolts, and a cover assembly is installed on the flange at the other end of the shell; the conductor assembly comprises three conductors fixed to the pot-type insulator by bolts, and branch conductors are arranged on the conductors; a plurality of branch cylinders are also arranged on the side wall of the shell, for the branch conductors to be able to lead out and for the inspection cover assembly for installing the inspection cover.

[0008] Furthermore, the conductor includes a connecting conductor, a straight conductor, a shielding ball and the branch conductor; the connecting conductor and the shielding ball are respectively arranged at both ends of the straight conductor, the branch conductor is arranged on the side of the straight conductor, and the conductor is bolted to the pot insulator through the connecting conductor.

[0009] Furthermore, the shielding ball is an arc-shaped structure.

[0010] Furthermore, the branch conductor is also connected to a contact assembly.

[0011] Furthermore, a contact seat assembly is installed on a side of the pot-type insulator away from the inner cavity of the shell.

[0012] Furthermore, the cover plate of the cover plate assembly is provided with an inflation hole on which an air valve can be installed.

[0013] Furthermore, a pressure gauge is connected to the cover plate of the cover plate assembly.

[0014] Furthermore, the shell is made of aluminum alloy.

[0015] The beneficial effects of the utility model are:

[0016] 1. The three-phase conductors in this device adopt an integrated structure, and the conductors are fixedly assembled with one end of the basin insulator, which has a simple structure, few parts, and effectively reduces the manufacturing cost;

[0017] 2. During installation and use, the conductor assembly can be pushed into the shell as a whole, which reduces the difficulty of installation and improves production efficiency. At the same time, a contact seat assembly is arranged on the outside of the pot-type insulator, which makes the assembly simple and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a structural schematic diagram of a three-phase common box GIL branch unit proposed by the utility model;

[0019] Figure 2 This is a schematic diagram of the structure of the conductor assembly in a three-phase common box GIL branch unit proposed by the utility model;

[0020] Figure 3 for Figure 2 Schematic diagram of the structure of the conductor.

[0021] In the figure: 1. Contact seat assembly; 2. Conductor assembly; 2-1. Basin insulator; 2-2. Conductor; 2-2-1. Connecting conductor; 2-2-2. Straight conductor; 2-2-3. Branch conductor; 2-2-4. Shielding ball; 2-3. Contact assembly; 3. Housing; 4. Pressure gauge; 5. Air valve; 6. Cover assembly; 6-1. Cover; 7. Inspection cover assembly; 7-1. Inspection cover. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0023] Reference Figure 1 and Figure 2 A three-phase common box GIL branch unit comprises a tubular shell 3, a conductor assembly 2 is installed in the shell 3, the conductor assembly 2 is bolted to the flange at one end of the shell 3 through a pot-type insulator 2-1, and a cover assembly 6 is installed on the flange at the other end of the shell 3; the conductor assembly 2 comprises three conductors 2-2 bolted to the pot-type insulator 2-1, and each of the conductors 2-2 is provided with a branch conductor 2-2-3; a plurality of branch cylinders are also provided on the side wall of the shell 3, which can be used for the branch conductors 2-2-3 to lead out and for installing an inspection cover assembly 7 for the inspection cover 6-1. During installation and use, the conductor assembly can be pushed into the shell as a whole, which reduces the difficulty of installation and improves production efficiency; the shell metal-encloses the internal components and fills them with insulating gas for insulation, isolates the internal live conductors from the outside world, and ensures the insulation of the shell. Bolt holes are provided on the flanges at both ends of the shell to allow the units to be spliced.

[0024] The inspection cover assembly 7 arranged on the side wall of the shell can be opened to clean the insulating parts and collect particles. When the foreign matter moves under the action of the electric field and jumps to the bottom flange, it enters the shielding pit and stops jumping.

[0025] Reference Figure 3 , the conductor 2-2 includes a connecting conductor 2-2-1, a straight conductor 2-2-2, a shielding ball 2-2-4 and the branch conductor 2-2-3; the connecting conductor 2-2-1 and the shielding ball 2-2-4 are respectively arranged at the two ends of the straight conductor 2-2-2, the branch conductor 2-2-3 is arranged on the side of the straight conductor 2-2-2, and the conductor 2-2 is bolted to the pot-type insulator 2-1 through the connecting conductor 2-2-1. The pot-type insulator mainly functions to support the conductor and isolate the air chamber. The three conductors are an integral welded structure and can also be cast as a whole. When the conductor is long, welding is easy to adopt. The length of the three-phase conductor and the spacing of the branches can be adjusted according to the specific project needs. The three-phase conductor in this device adopts an integrated structure, and the conductor is fixedly assembled with one end of the pot-type insulator. The structure is simple, the number of parts is small, and the manufacturing cost is effectively reduced.

[0026] The shielding ball 2-2-4 is an arc-shaped structure. The arc-shaped shielding ball arranged at the end of the straight conductor mainly plays a role in shielding the electric field at the end.

[0027] The branch conductor 2-2-3 is also connected to a contact assembly 2-3 to facilitate subsequent assembly.

[0028] A contact seat assembly 1 is also installed on the side of the pot-type insulator 2-1 away from the inner cavity of the shell 3, which can be slidably connected with other units, and the assembly is simple and convenient.

[0029] The cover plate 6 - 1 of the cover plate assembly 6 is provided with an inflation hole for installing the air valve 5 .

[0030] The cover plate 6 - 1 of the cover plate assembly 6 is also connected to a pressure gauge 4 .

[0031] The shell 3 is made of aluminum alloy, which can shield the internal magnetic field and reduce eddy current loss.

[0032] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A three-phase common box GIL branch unit, comprising a tubular housing (3), characterized in that: A conductor assembly (2) is installed in the housing (3), the conductor assembly (2) being bolted to a flange at one end of the housing (3) through a pot-type insulator (2-1), and a cover assembly (6) is installed on the flange at the other end of the housing (3); the conductor assembly (2) comprises three conductors (2-2) bolted to the pot-type insulator (2-1), and each of the conductors (2-2) is provided with a branch conductor (2-2-3); a plurality of branch cylinders are also provided on the side wall of the housing (3), for the branch conductors (2-2-3) to be led out and for the inspection cover assembly (7) for installing an inspection cover (6-1).

2. A three-phase common box GIL branch unit according to claim 1, characterized in that: The conductor (2-2) comprises a connecting conductor (2-2-1), a straight conductor (2-2-2), a shielding ball (2-2-4) and the branch conductor (2-2-3); the connecting conductor (2-2-1) and the shielding ball (2-2-4) are respectively arranged at two ends of the straight conductor (2-2-2), the branch conductor (2-2-3) is arranged on the side of the straight conductor (2-2-2), and the conductor (2-2) is bolted to the pot insulator (2-1) through the connecting conductor (2-2-1).

3. A three-phase common box GIL branch unit according to claim 2, characterized in that: The shielding ball (2-2-4) is an arc-shaped structure.

4. A three-phase common box GIL branch unit according to claim 2, characterized in that: The branch conductor (2-2-3) is also connected to a contact assembly (2-3).

5. A three-phase common box GIL branch unit according to claim 1, characterized in that: A contact seat assembly (1) is also installed on the side of the pot-type insulator (2-1) away from the inner cavity of the shell (3).

6. A three-phase common box GIL branch unit according to claim 1, characterized in that: The cover plate (6-1) of the cover plate assembly (6) is provided with an air filling hole on which an air valve (5) can be installed.

7. A three-phase common box GIL branch unit according to claim 1, characterized in that: The cover plate (6-1) of the cover plate assembly (6) is also connected to a pressure gauge (4).

8. A three-phase common box GIL branch unit according to claim 1, characterized in that: The shell (3) is made of aluminum alloy.

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