WO2020141194A1

WO2020141194A1 - Basin-type insulator for gas insulated switchgears

Info

Publication number: WO2020141194A1
Application number: PCT/EP2020/050030
Authority: WO
Inventors: Chang Kai WU; Andreas Kloos
Original assignee: Siemens Aktiengesellschaft
Priority date: 2019-01-02
Filing date: 2020-01-02
Publication date: 2020-07-09
Also published as: CN209591683U

Abstract

The present utility model relates to an insulating basin used for a gas insulated switchgear, which can ensure the grounding performance of a shell without adding an installation or production procedure, which insulating basin comprises: a disk-shaped basin body, the basin body being cast from an insulating material; at least one conductive insert axially cast in the basin body, the conductive insert being a conductor material axially penetrating the basin body; and a connection insert axially penetrating the basin body, the connection insert being arranged on an outer circumference of the basin body and being provided with an axial threaded hole; the insulating basin further comprising a grounding conductor axially penetrating the basin body, wherein the grounding conductor is a conductor material axially cast on the outer circumference of the basin body, and heights of two axial ends of the grounding conductor are not less than those of two end faces of the basin body. The present utility model further relates to a gas insulated switchgear comprising the above insulating basin.

Description

BASIN-TYPE INSULATOR FOR GAS INSULATED SWITCHGEARS

Technical Field

The present utility model relates to an insulating basin, and in particular to an insulating basin for a gas insulated switchgear. In addition, the present utility model further relates to a gas insulated switchgear using such an insulating basin .

Background Art

In power systems, insulating basins, also referred to as basin- type insulators, are important components of gas insulated switchgears (hereinafter referred to as GISs) . An insulating basin in the prior art is shown in FIG. 1. In order to meet the requirements of the grounding of a shell, a current-conducting bar needs to be additionally provided on housings of components on two sides of the insulating basin. If the requirements of the grounding are met in this way, it is necessary to remove paint from shells of components which are in contact with installation faces of the current-conducting bar when the current-conducting bar is being installed, so as to ensure a good electrical connection. Alternatively, the contact portions are processed before a painting procedure is performed on the shells of the components, such that metal portions can be left exposed. In this way, the workload of on-site installation processing is increased, or the procedure and complexity of painting processing are increased. In addition, in some application scenarios, the shape of the shells on the two sides of the insulating basin limit the possibility of additionally providing the bridged current-conducting bar.

Therefore, there is a need for a solution of an insulating basin which can be installed more conveniently and can also ensure the grounding performance of a shell. Summary of the Utility Model

An object of the present utility model is to provide an insulating basin for a gas insulated switchgear, which can ensure the grounding performance of a shell without adding an installation or production procedure, which insulating basin comprises: a disk-shaped basin body, the basin body being cast from an insulating material; at least one conductive insert axially cast in the basin body, the conductive insert being a conductor material axially penetrating the basin body; and a connection insert axially penetrating the basin body, the connection insert being arranged on an outer circumference of the basin body and being provided with an axial threaded hole; the insulating basin further comprising a grounding conductor axially penetrating the basin body, wherein the grounding conductor is a conductor material axially cast on the outer circumference of the basin body, and heights of two axial ends of the grounding conductor are not less than those of two end faces of the basin body.

According to another aspect of the present utility model, the grounding conductor is partially embedded into the basin body and partially exposed on an outer circumferential face of the basin body.

According to another aspect of the present utility model, the insulating basin comprises four grounding conductors distributed at equal intervals, wherein two of said connection inserts are distributed between every two of the grounding conductors at equal intervals.

According to another aspect of the present utility model, the grounding conductor is provided with an axial threaded hole.

According to another aspect of the present utility model, the connection insert is axially cast in the basin body. According to another aspect of the present utility model, the connection insert is embedded into a hole reserved or post- processed in the basin body by means of a press fit.

According to another aspect of the present utility model, an inner wall of the threaded hole is provided with a conductive layer or a metal shielding band.

According to another aspect of the present utility model, the insulating basin comprises three conductive inserts which respectively correspond to three phases of an alternating current .

The present utility model further provides a gas insulated switchgear comprising an insulating basin as described above, wherein housings on two sides of the insulating basin are provided with threaded holes positioned corresponding to the insulating basin, and the housings are fixed to the insulating basin via screws.

Brief Description of the Drawings

FIG. 1 is a schematic diagram of an insulating basin in an installed state in the prior art;

FIG. 2 is a schematic structural diagram of an insulating basin according to a first embodiment of the present utility model; FIG. 3 is a schematic diagram of the insulating basin in an installed state according to the first embodiment of the present utility model; and

FIG. 4 is a schematic structural diagram of an insulating basin according to a second embodiment of the present utility model.

Description of reference signs

1 Basin body

2 Conductive insert

3 Connection insert

4 Grounding conductor

10 Housing Detailed Description of Embodiments

Particular embodiments of the present utility model are described below in conjunction with the accompanying drawings.

FIG. 2 illustrates an insulating basin according to a first embodiment. The insulating basin comprises a disk-shaped basin body 1 cast from an insulating material. Three conductive inserts 2 are axially embedded in the middle of the basin body 1. The conductive inserts 2 axially penetrate the basin body 1, and the three conductive inserts 2 respectively correspond to three phases of three-phase alternating current and can be used to connect alternating current lines on two sides of the insulating basin. A circle of connection inserts 3, which axially penetrate and are cast in the basin body 1, are further comprised on an outer circumferential side of the insulating basin. The connection inserts 3 are provided with an axial threaded hole. During installation of the insulating basin, housings 10 on two sides thereof are screwed to the threaded holes of the connection insert 3, so that the insulating basin is fixed to the housings 10 of adjacent components. In addition, a grounding conductor 4, which axially penetrates and is cast in the basin body, is further comprised on the outer circumferential side of the insulating basin. The grounding conductor is made of a conductor material, and two axial ends thereof slightly protrude from end faces of the basin body 1. The grounding conductor 4 is not completely embedded into the basin body 1 like the connection insert 3, but is partially embedded into the basin body 1, with the other part being exposed on a side face of the basin body 1 and having the same radius of curvature as the basin body 1, so that a complete geometrical shape is formed on the side face of the insulating basin .

The grounding conductor 4 is also provided with a threaded hole for fixing a screw. Four grounding conductors 4 are arranged on the insulating basin at equal intervals, and two of the connection inserts 3 are arranged between every two of the grounding conductors 4 at equal distances, that is, there are twelve threaded holes in total on the circumference of the insulating basin for fixing screws. However, according to an actual application scenario, the above threaded hole may not be positioned in the grounding conductor 4, and a stable electrical connection between the grounding conductor 4 and the housings on the two sides is ensured by fixing screws in other positions. Likewise, the number of the grounding conductors 4 and the interval between the threaded holes can also be adjusted according to an actual application scenario.

The insulating basin in the first embodiment is shown in an installed state in FIG. 3. An insulating basin is sandwiched between two metal housings 10, which is fixed by means of a circle of screws on the outer circumferential side. One screw is tightened on either side of each threaded hole, wherein two screws at two ends of the grounding conductor 4 ensure a good contact between the housings 10 on the two sides and the grounding conductor, particularly at the threaded hole in the grounding conductor. The screws ensure a good contact between the housings on the two sides and the grounding conductor. Since the contact face is not an exposed face, a painting processing is not needed essentially, so that no special paint removal is needed in the installation process or no special procedure is needed to protect metal at the contact position from being covered by paint in the processing process.

A conductive layer or a metal shielding band is arranged on an inner wall of the threaded hole in the insulating basin, to adjust an internal electric field, so as to avoid the occurrence of concentration of field strength.

An insulating basin according to a second embodiment of the present utility model is shown in FIG. 4, which differs from the insulating basin in the first embodiment in that only one conductive insert 4 is comprised for a GIS with three phases separately routed.

In a gas insulated switchgear provided in the present utility model, the above insulating basin can be applied in any position in which housings on two sides need to be connected via an insulating basin, and a three-phase insulating basin in the first embodiment or a single-phase insulating basin in the second embodiment is selected according to the number of conductors actually comprised in the gas insulated switchgear. A flange of the housing on either side of the insulating basin is provided with through holes corresponding to the threaded holes in the insulating basin, and particularly to the threaded hole in the grounding conductor 4, and screws are used to ensure the good contact between the housings 10 on the two sides and the grounding conductor 4.

Although the content of the present utility model has been described in detail by means of the above preferred embodiments, it should be appreciated that the above description should not be construed as limiting the present utility model. Various modifications and replacements of the present utility model will be apparent to those skilled in the art upon reading the above content. Therefore, the scope of protection of the present utility model shall be limited by the appended claims. In addition, any reference sign in the claims should not be construed as limiting the claims involved. The term "comprise" does not exclude other apparatuses or steps not listed in the claims or the specification. The terms "first", "second", etc. are only used to refer to names, and do not denote any particular order. Herein, "parallel", "perpendicular", etc. are not strictly limited in the mathematical and/or geometrical sense, and further include errors that can be understood by those skilled in the art and are allowable during manufacture or use.

Claims

1. An insulating basin for a gas insulated switchgear, which insulating basin comprises:

a disk-shaped basin body (1), the basin body (1) being cast from an insulating material;

at least one conductive insert (2) axially cast in the basin body (1), the conductive insert (2) being a conductor material axially penetrating the basin body (1); and

a connection insert (3) axially penetrating the basin body, the connection insert (3) being arranged on an outer circumference of the basin body (1) and being provided with an axial threaded hole;

the insulating basin further comprising a grounding conductor (4) axially penetrating the basin body, wherein the grounding conductor (4) is a conductor material axially cast on the outer circumference of the basin body (1), and heights of two axial ends of the grounding conductor are not less than those of two end faces of the basin body (1) .

2. The insulating basin as claimed in claim 1, wherein the grounding conductor (4) is partially embedded into the basin body (1) and partially exposed on an outer circumferential face of the basin body (1) .

3. The insulating basin as claimed in claim 2, comprising four grounding conductors (4) distributed at equal intervals, wherein two of said connection inserts (3) are distributed between every two of the grounding conductors (4) at equal intervals .

4. The insulating basin as claimed in claim 1, wherein the grounding conductor (4) is provided with an axial threaded hole .

5. The insulating basin as claimed in claim 1, wherein the connection insert (3) is axially cast in the basin body.

6. The insulating basin as claimed in claim 1, wherein the connection insert (3) is embedded into a hole reserved or post- processed in the basin body (1) by means of a press fit.

7. The insulating basin as claimed in claim 1, wherein an inner wall of the threaded hole is provided with a conductive layer or a metal shielding band.

8. The insulating basin as claimed in claim 1, comprising three conductive inserts (2) which respectively correspond to three phases of alternating current.

9. A gas insulated switchgear, comprising an insulating basin of any of claims 1 to 8.

10. The gas insulated switchgear as claimed in claim 9, wherein housings on two sides of the insulating basin are provided with threaded holes positioned corresponding to the insulating basin, and the housings (10) are fixed to the insulating basin via screws.