CN206211279U - A kind of rigid gas insulated power line build-out unit - Google Patents

Abstract

This invention proposes a rigid gas-insulated transmission line compensation unit, located at a corner section perpendicular to the line being compensated. It includes an intermediate housing and a conductor installed within the compensation unit. It also includes two flanged corrugated pipes, a shorting plate, a limiting plate, and an insulating support. A corrugated pipe is fixedly installed at each end of the intermediate housing, and a shorting plate and a limiting plate are fixedly installed on each corrugated pipe. The insulating support is installed within the intermediate housing, and the conductor is supported by the insulating support. This invention compensates for thermal expansion changes in the straight section by deflecting the corrugated pipes at the vertical corner section, achieving the purpose of line deflection compensation. Furthermore, it requires fewer compensation devices for busbars of the same length. This invention has advantages such as low cost, simple structure, and convenient installation.

Description

A rigid gas insulated transmission line compensation unit

technical field

The utility model relates to the field of high-voltage power transmission and transformation, in particular to a rigid gas-insulated power transmission line compensation unit.

Background technique

Rigid gas insulated transmission line (GIL) is a power transmission device composed of an insulating gas with a certain pressure enclosed inside a metal pipe, a central conductor providing a current channel, and other insulating components.

GIL is a large-capacity, high-voltage, long-distance transmission line. During the operation of the bus, due to temperature changes and thermal expansion and contraction effects, the length changes, and the foundation settlement during the long-term operation of the equipment will cause problems between rigidly connected equipment. generate a large internal stress. Current GIL lines use bellows to handle line compensation deflection. The specific way of use is that a bellows needs to be arranged between each two to three standard sections to compensate for the position and size changes caused by the thermal expansion and base displacement between the standard sections.

Utility model content

In order to solve the above problems, the utility model proposes a rigid gas insulated transmission line compensation unit, which is arranged at the corner part perpendicular to the line to be compensated, including an intermediate shell and a conductor installed in the compensation unit, and also includes two strips The bellows, short flow piece, limit piece and insulating support of the flange, the two ends of the intermediate housing are respectively fixed with a bellows, and the short flow piece and the limit piece are fixedly installed on the bellows. An insulating supporter is installed in the intermediate case, and the conductor is supported by the insulating supporter.

Further, the conductor is single-phase or three-phase.

Further, the number of the short tape-outs is a multiple of 2, and there are at least two.

Further, there are two limiting pieces.

Further, the short flow piece and the limit piece are fixedly connected with the flanges at both ends of the bellows.

Further, the intermediate housing and the bellows are fixedly connected by flange bolts.

Further, the insulating support includes a supporting insulator and a pot insulator, and the conductor is connected to the supporting insulator and the pot insulator; the supporting insulator is fixedly connected to the intermediate shell by welding an aluminum row, or is connected to the intermediate shell through a roller mechanism form a sliding connection.

The utility model uses the angle deflection of the corner section to compensate the length change of the straight section through the combination of two short bellows, so as to realize the purpose of compensating the deflection of the line, and can absorb relatively large temperature expansion and contraction in the vertical direction with a very short bellows section. Installation error. The utility model has the advantages of low cost, simple structure, convenient installation and the like.

Description of drawings

Figure 1 is a schematic diagram of the structure of a single-phase conductor installed in the compensation unit;

Figure 2a is a side perspective view of the installation position of the compensation unit and the single-phase conductor;

Figure 2b is a side view of the compensation unit;

Figure 2c is a cross-sectional view of the installation position of the compensation unit and the single-phase conductor;

Figure 3 is a schematic diagram of no deformation when the compensation unit is installed on the GIL line without thermal expansion and contraction;

Figure 4 is a schematic diagram of the GIL line after the installation of the compensation unit after absorbing deformation;

Fig. 5 is a structural schematic diagram of installing a three-phase conductor in the compensation unit of the present invention;

Figure 6a is a side perspective view of the installation position of the compensation unit and the three-phase conductor;

Figure 6b is a top view of the compensation unit;

Figure 6c is a cross-sectional view of the installation position of the compensation unit and the three-phase conductor;

Fig. 7 is a schematic diagram of the structure of the pot insulator.

In the figure: 1-bellows, 2-intermediate shell, 3-short flow sheet, 4-limit sheet, 5-conductor, 6-support insulator, 71-metal flange, 72-insulator, 73-conductor insert pieces.

detailed description

The specific implementation of a rigid gas insulated transmission line compensation unit of the present invention will be described in detail below in conjunction with the accompanying drawings. This embodiment is only used to illustrate the present invention and not to limit the scope of the present invention. Modifications of various equivalent forms of the novelty all fall within the scope defined by the appended claims of the present application.

Example 1:

In this example, the conductors inside the intermediate housing 2 are single-phase conductors 5, and the supporting insulators are single-phase supporting insulators. As shown in Figure 1, the compensation unit of the present invention is composed of two bellows 1 with flanges and an intermediate housing 2, and the compensation unit is arranged at the corner part perpendicular to the compensation line. As shown in Figures 2a and 2b, two corrugated pipes 1 are respectively installed on both ends of the intermediate housing 2 through flange bolts, and a short flow piece 3 is fixedly installed on each bellows through a flange. In this embodiment, the short flow piece has Two, the short flow piece 3 is connected to the flanges at both ends of the bellows 2; two limit pieces 4 are symmetrically fixed and installed on the bellows through the flanges. As shown in Figure 2c, the supporting insulator is installed inside the intermediate housing, and the conductor is installed on the supporting insulator 6. The supporting insulator fixes the conductor on the axis of the intermediate housing to avoid contact between the conductor and the intermediate housing to ensure effective insulation. The support insulator is fixedly connected with the intermediate case 2 by welding the aluminum row.

When the utility model is in use, the corrugated pipe 1 connects the intermediate housing 2 and the adjacent housings, and the conductors are inserted through contacts. The conductor is supported inside the housing by supporting insulators. As shown in Figure 3, there is no deformation when the GIL line does not expand with heat and contract with cold. A compensation unit is set at the corner of the line perpendicular to the line to be compensated. Using the compensation unit of the present invention Compensation design for the unit, as shown in Figure 4, the GIL bus bar appears to be offset by an angle of α, α is between 0°-3°, the conductor 5 moves with the housing at the same time, the compensation unit absorbs the deformation, and the conductor 5 passes through the adjacent housing. The conductor is inserted through the contact, and the compensation is realized through the contact. At this time, even if the GIL line expands with heat and contracts with cold, it will not affect the normal use of the line, ensuring the safety of the equipment during operation.

Example 2:

As shown in Fig. 5, Fig. 6a, 6b, 6c, in this example, the conductors inside the intermediate housing are three-phase conductors, and the supporting insulators are three-phase supporting insulators. The three-phase supporting insulators are connected with the intermediate housing 2 by a roller mechanism to form a sliding connection. Other structures are the same as in Embodiment 1.

Example 3:

In this example, the conductors inside the intermediate housing are three-phase conductors, and the supporting insulators are basin-type insulators. Pot insulators are mounted on flanges at the ends of corrugated pipes. As shown in FIG. 7 , the basin type insulator includes a metal flange 71 , an insulator 72 and a conductor insert 73 , the insulator 72 is embedded in the metal flange 71 , and the conductor insert 73 is embedded in the insulator 72 . The conductor 5 is mounted in the conductor insert 73 . Other structures are the same as in Embodiment 1.

The utility model combines a group of bellows into a compensation unit, and uses the ability of the bellows to absorb angle changes to compensate for lateral displacement changes to achieve the purpose of line compensation. Therefore, it is also called an angle compensation unit or a hinge compensation unit. The utility model is suitable for single or multi-item GIL with a voltage level of 110kV～1000kV, and is suitable for GIL insulating gas adopting SF ₆ , or mixed gas of SF ₆ and N ₂ , or pure compressed air. The scope of application is relatively wide, and the promotion value is high. The utility model has the advantages of large compensation amount, low cost, high reliability and convenient installation.

The preferred embodiment of the utility model has been described in detail above in conjunction with the accompanying drawings, but the utility model is not limited to the specific details of the above-mentioned embodiment, and within the scope of the technical concept of the utility model, the technical solution of the utility model can be carried out in many ways. These simple modifications all belong to the protection scope of the present utility model.

Claims (7)

1. A compensation unit for a rigid gas-insulated transmission line, which is arranged at a corner portion perpendicular to the line to be compensated, includes an intermediate housing (2) and a conductor (5) installed in the compensation unit, and is characterized in that it also includes two a bellows (1) with a flange, a short flow piece (3), a limit piece (4) and an insulating support member, and a bellows (1) is fixedly installed at both ends of the intermediate housing (2), so that The bellows (1) is fixedly installed with a short flow piece (3) and a limit piece (4), the insulating support is installed in the middle housing (2), and the conductor (5) passes through the Insulated support supports. 2. The rigid gas insulated transmission line compensation unit according to claim 1, wherein the conductor is single-phase or three-phase. 3. The rigid gas insulated transmission line compensation unit according to claim 1, characterized in that the number of the short run-outs (3) is a multiple of 2, and there are at least two. 4. The rigid gas insulated transmission line compensation unit according to claim 1, characterized in that there are two said limiting pieces (4). 5. The rigid gas insulated transmission line compensation unit according to claim 1, 2 or 3, characterized in that the short run-off piece (3) and the limit piece (4) are connected to the flanges at both ends of the bellows (1) Fixed connection. 6. The rigid gas insulated transmission line compensation unit according to claim 1, characterized in that, the intermediate housing (2) and the bellows (1) are fixedly connected by flange bolts. 7. The rigid gas insulated transmission line compensation unit according to claim 1, characterized in that, the insulating support includes a support insulator (6) and a pot insulator, and the conductor is connected to the support insulator or the pot insulator; the support The insulator (6) forms a fixed connection with the intermediate housing (2) through welding aluminum bars, or forms a sliding connection with the intermediate housing (2) through a roller mechanism.