CN206225948U - A kind of rigid gas insulated power lines branch unit - Google Patents

Abstract

The utility model discloses a kind of rigid gas insulated power lines branch unit, housing (2) including disc insulator, flange and both ends open, wherein, the housing includes multiple branch's housings (3) being interconnected with housing, branch's housing outer end opening；The flange is arranged on the opening of housing two ends and branch's housing, and disc insulator is arranged on flange.The branched structure that the utility model is provided, is separated three branch road connection other equipments on three-phase bus unit.This three branch roads can be connected with single-phase bus, be easy to experiment, operation and the malfunction elimination of different branch, and greatly reduce floor space, make installation more flexibility and reliability.

Description

A rigid gas insulated transmission line branch unit

technical field

The utility model relates to the high-voltage power industry, in particular to a branch unit used in rigid gas-insulated transmission lines.

Background technique

Rigid gas insulated transmission line (GIL) is a power transmission device composed of an insulating gas enclosed inside a metal pipe with a certain pressure, a central conductor providing a current channel, and other insulating components. GIL is a closed structure with metal rigidity, which is less affected by the external atmosphere and environment, and has no external magnetic field. The internal use of SF ₆ or SF ₆ and N ₂ mixed gas has good insulation performance, low dielectric loss, no aging problem, no flammability, and high reliability. It adopts a compact closed structure and occupies less space than overhead lines. The layout is flexible, which can simplify the system wiring and improve the reliability of the power supply of the whole system.

As a large-capacity, high-voltage, long-distance transmission line, GIL has problems such as adding current branches, installing test equipment, or introducing other auxiliary units. When converting the three-phase communal busbar into a branched single-phase busbar, the current solution is to design a single-support insulator to support the conductor inside the three-phase shell, which requires an additional number of openings on the branch shell for installing the single-phase busbar. Supporting insulators, the product structure is complicated, the processing is difficult, the installation is inconvenient, and the cost is high.

Utility model content

In order to solve the above technical problems, the utility model provides a rigid gas insulated transmission line branch unit, which branches the three-phase communal GIL into a single-phase GIL to facilitate connection with overhead lines, GIS equipment, transformers and other equipment. Or divide one round of three-phase common GIL into: one round of three-phase common GIL and one round of single-phase GIL. When there is no such requirement, it can also be sealed with a cover plate on the branch housing. The concrete technical scheme of the utility model is as follows:

A rigid gas insulated transmission line branch unit, comprising a pot insulator, a branch housing with a flange and a conductor installed in the branch unit, wherein,

The branch housing includes a main housing and three branch housings communicating with the main housing, and the outer end of the branch housing is open;

The flange is welded on both ends of the housing and the opening of the branch housing, the pot insulator is installed on the flange, and the pot insulator is connected with the conductor.

Further, the conductors include straight conductors and bent conductors; the straight conductors are installed in the main housing and connected to three-phase pot insulators, and the bent conductors are installed in the branch housing to connect with single-phase pot insulators. The insulator is connected, the straight conductor has a fixed contact, the curved conductor has a moving contact, and the fixed contact and the moving contact are connected through contact fingers.

Further, the pot insulator is a three-phase pot insulator or a single-phase pot insulator.

Further, the branch unit includes a cover plate installed on the flange.

Further, the inside of the branch unit is filled with insulating gas at a certain pressure, including: SF ₆ , a mixed gas of SF ₆ and N ₂ , and compressed air.

Further, the branch casings are distributed in parallel along the axial direction of the main casing.

Further, the branch casings are distributed on the same radial section of the main casing, or on different radial sections of the main casing.

The beneficial effects of the utility model are:

The branch unit provided by the utility model divides it into three branches on the three-phase GIL to connect to other equipment. These three branches can be connected with single-phase GIL, which is convenient for the test, operation and troubleshooting of different branches, and greatly reduces the occupied area, making the installation more flexible and reliable.

Description of drawings

Fig. 1 is the structural representation of embodiment 1 of branch unit of the present invention;

Fig. 1 a is the right view of Fig. 1;

Fig. 1 b is the I-I sectional view of Fig. 1;

Figure 1b-1 H-H sectional view of Figure 1;

Figure 1b-2 G-G sectional view of Figure 1;

Fig. 1c is a schematic diagram of the connection structure at the conductor branch of embodiment 1;

Figure 2a is a cross-sectional view of Embodiment 2 of the branch unit of the present invention;

Fig. 2b is the F-F sectional view of Fig. 2a;

Fig. 2b-1 is the E-E sectional view of Fig. 2a;

Figure 2b-2 is a D-D sectional view of Figure 2a;

Fig. 2c is a schematic diagram of the connection structure at the conductor branch of embodiment 2;

The side perspective view of Fig. 3a embodiment 3, it is the G-G sectional view of Fig. 3b;

Figure 3b is a cross-sectional perspective view of Example 3.

detailed description

The specific implementation of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be noted that these specific descriptions are only for those of ordinary skill in the art to understand the present invention more easily and clearly, rather than limiting interpretation of the present invention. .

The branch unit of the utility model is suitable for converting a rigid gas insulated transmission line with a three-phase integrated structure (three-phase integrated type) into a rigid gas insulated transmission line with a three-phase split structure (single-phase type), or splitting the three-phase The body structure (single-phase system) is converted into a three-phase system structure (three-phase system). Applicable to the voltage level of 66kV ~ 330kV. The branch casings on the branch casing are perpendicular to the axis of the main casing, and the branch casings can be arranged in parallel, on different planes or in the same radial section of the main casing. The branch housing can be a pull-out hole on the main housing, or an insertion welding hole. The number of branch casings is three.

The insulating gas filled with a certain pressure inside the branch unit includes: SF ₆ , mixed gas of SF ₆ and N ₂ , and compressed air.

Example 1:

As shown in Figure 1, 1a, 1b, 1b-1, 1b-2, a rigid gas insulated transmission line branch unit includes three single-phase pot insulators 1, a three-phase pot insulator 5, and a cover plate 4 , branch shell 2, conductor. The branch housing 2 includes a main housing and a branch housing 3 . The main casing is provided with three equidistant and parallel branch casings 3 with open outer ends along the axial direction, and the branch casings 3 have open outer ends. Openings are provided at both ends of the main casing. The branch housings are used to branch three-phase conductors, and each branch housing accommodates one phase conductor. The branch housing has a different diameter than the main housing.

The three-phase pot insulator 5 is installed on the flange at the right end of the main shell, the cover plate 4 is installed on the left end flange of the main shell, and the three single-phase pot insulators 1 are respectively installed on the flanges of the branch shell .

As shown in Figure 1c, the conductors include a straight conductor 61 and a curved conductor 62; the straight conductor 61 is installed in the main housing and connected to the three-phase basin insulator 5, and the curved conductor 62 is installed in the branch housing and connected to the single-phase basin insulator 1 connection, the connection structure at the conductor branch is shown in Figure 1c, the straight conductor 61 is provided with a static contact 64, and the L-shaped curved conductor 62 has a movable contact 63, and the static contact 63 and the movable contact 64 are inserted through the contact fingers. Unplug the connection.

Example 2:

As shown in Figures 2a, 2b, 2b-1, and 2b-2, a rigid gas-insulated transmission line branch unit includes three single-phase basin insulators 1, two three-phase basin insulators 5, branch housings 2 and conductor. Two three-phase pot insulators 5 are respectively installed on the flanges at both ends of the main shell, and three single-phase pot insulators 1 are respectively mounted on the flanges of the branch shell 3 . The connection structure at the conductor branch is shown in Figure 2c. Two sections of straight conductors are connected to a T-bent conductor. There is a fixed contact 64 on the straight conductor 61, and a moving contact 63 on the T-bend conductor 62. The static contact 63 and The moving contact 64 is plugged and connected through contact fingers. All the other structures are the same as example 1.

Example 3:

As shown in Figures 3a and 3b, a rigid gas insulated transmission line branch unit includes three single-phase pot insulators 1, a branch case 2, a three-phase pot insulator 5, a cover plate and conductors. The planes of the three branch casings 3 of the branch casing 2 are perpendicular to the axis of the main casing, and the three branch casings 3 are distributed on the same section of the main casing. The three-phase pot insulator is installed on the flange at the right end of the main shell, and the cover plate is installed on the left end flange of the main shell. The conductors are installed in the main housing, and the straight conductors 61 are installed on three-phase pot insulators. The bent conductors 62 are mounted on single phase basin insulation. Straight conductors and bent conductors are inserted through the fixed contacts at the ends of the straight conductors and the moving contacts at the ends of the bent conductors. The connection structure at the conductor branch is shown in Figure 1c. All the other structures are the same as example 1.

The rigid gas insulated transmission line branch unit provided by the utility model divides it into three branches on the three-phase GIL to connect other equipment. These three branches can be connected with single-phase GIL, which is convenient for the test, operation and troubleshooting of different branches, and greatly reduces the occupied area, making the installation more flexible and reliable.

The above description is only an example of the preferred combination of the present utility model, and is not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present utility model should be included in the Within the protection scope of the present utility model.

Claims (8)

1. a kind of rigid gas insulated power lines branch unit, it is characterised in that including disc insulator,

Branch's housing (2) with flange and the conductor in branch units, wherein,

Branch's housing includes main casing and three branch road housings (3) being interconnected with main casing, the branch road housing (3) Outer end opening；

On the opening of the main casing two ends and branch road housing (3), the disc insulator is arranged on institute to the flange welding State on flange, the disc insulator is connected with the conductor.

2. branch units according to claim 1, it is characterised in that the conductor includes straight conductor (61) and curved conductor (62)；The straight conductor (61) is connected in the main casing with three-phase disc insulator (5), curved conductor (62) peace It is connected with single-phase disc insulator (1) in the branch road housing, there is static contact (64) on the straight conductor (61), it is described curved There is moving contact (63) on conductor (62), the static contact (64) and the moving contact (63) are plugged by fingertip and connected.

3. branch units according to claim 1, it is characterised in that the disc insulator is three-phase disc insulator Or single-phase disc insulator (1) (5).

4. branch units according to claim 1, it is characterised in that the branch units includes being arranged on the flange Cover plate (4).

5. branch units according to claim 1, it is characterised in that the branch units inside filling certain pressure it is exhausted Edge gas, including：SF₆、SF₆And N₂Mixed gas, compressed air.

6. branch units according to claim 1, it is characterised in that the branch road housing is along the main casing axial direction side To parallel distribution.

7. branch units according to claim 1, it is characterised in that the branch road housing is distributed in the same of the main casing On one radial section.

8. branch units according to claim 1, it is characterised in that the branch road housing is distributed in the main casing not With on radial section.