FR2777127A1 - SINGLE-PHASE SHIELDED PANEL FOR HIGH VOLTAGE SWITCHING INSTALLATION - Google Patents

Abstract

In this single-phase shielded switchboard for high-voltage gas-insulated switching installation, the distance (a) between the vertical planes assigned to the two end circuit-breakers and the vertical plane of the middle circuit-breaker (12) is less than the distance (f) between the two end circuit breakers (11, 13) and the middle circuit breaker (12).

Description

Single-phase shielded switchboard for high-voltage switching installation

  The invention relates to the field of electrical energy distribution; it applies to the three-dimensional production of single-phase switchboards for high-voltage three-phase switching installations with gas insulation, the circuit breakers of which are arranged parallel side by side and in which the other components are placed above the

respective circuit breakers.

  In switching installations of the design described above, the distance between the poles of the three phases and therefore the width of the three-phase distribution board is determined by the dimensions, and particularly by the diameter, of the circuit breaker casing. The circuit breakers are arranged inside their shielded casing approximately in the middle, and at a certain distance from each other The other components connected to the phases of the switchboard are arranged respectively, in the middle, in a vertical plane above and below the corresponding circuit breaker. The circuit breaker casings are provided with vertically directed terminals, making it possible to install all of the components of the switchboard in the pole pitch defined by the circuit breakers, and to respect approximately the same pole pitch for the end phases of the adjacent switchboards, ( Braun Boveri Newspaper

Mitt. 4-73, pages 146 and 147).

  To be able to obtain as small a pole pitch as possible in a single-phase shielded switchboard, it is already known that it is necessary to make the shielded casing of the three circuit breakers in a single foundry piece (DE 89 07 711 U,

DE 89 07 710 U).

  Starting from a single-phase armored panel, in which the three circuit breakers are arranged side by side, parallel in their armored casing, a

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  a prescribed spacing, in which the shielded casing of the three circuit breakers is provided with terminals directed in a vertically plane for the connection of the other components of the switchboard and in which the other components, associated with one of the phases, of the switchboard are arranged above corresponding circuit breakers and in the middle in a vertical plane, the present invention aims to improve the accessibility, necessary for maintenance purposes, to the various switchgear panels, by

  modification of the layout in volume, of the components of these tables.

  To obtain this result, the invention starts from the basic idea that in high-voltage switching installations, the distance between the poles of the three phases of an armored panel is conditioned by the dimensions of the circuit breaker casings, but that the other components of the panels can be arranged using means specific to high-voltage techniques, such as increasing the gas pressure and optimizing the field layout (by giving the conductive parts an adequate configuration), which makes it possible to limit the diameter of the shielded casing of the other components to a value lower than that of the circuit breaker casing. This arrangement is purposely used in the present invention, in which the distance between the vertical planes assigned to the two end circuit breakers and the vertical plane assigned to the indoor circuit breaker is less than the distance between the planes of the

  two end circuit breakers and the corresponding plan of the interior circuit breaker.

  In this way, the components of the three stages of the array are closely related to each other, while the two end phases of two adjacent arrays have a larger interval between them. Significantly improved accessibility is obtained between adjacent tables. For construction, the invention has been made in such a way that the axes of the terminals of the casings of the two end circuit breakers are offset horizontally relative to the axis of the corresponding circuit breaker. This arrangement also makes it possible to mount on the front face of the shielded casings of the circuit breakers, connection flanges for the components of the switchboard, grounding switches among others, and consequently

  respect the same reduced interval.

  Preferably, the flanges arranged on the front face have

  also the smallest distance.

  In a switchboard thus designed, the pole pitch of the circuit breakers is

  higher than the other components of the array.

  Figures 1 to 3 give an example of embodiment of the new configuration of the switchboard, in which, Figure 1 is a plan view of the three casings of the circuit breakers, arranged side by side, Figure 2 is a vertical sectional view of an armored panel and,

  Figure 3 is a plan view of two tables arranged side by side.

  FIG. 1 represents what is called a block casing 1 intended to receive the three circuit breakers of a single-phase armored panel, constructed in accordance with DE 89 07 711 U. This casing is provided with three parts, 11, 12 and 13 for each of the three circuit breakers respectively. On each of these three parts is mounted a first connection flange 14 and a second connection flange 15 through which one reaches the current terminals 18 and 19 of the three circuit breakers. Each part of the casing is provided at one end with a connection flange 16 on the front side, and at the other end with a connection flange 17 on the front side. The

  circuit breaker drive devices are coupled by the flanges 17.

  The figure also shows the length f, which represents the distance between the axes of the two end poles of the circuit breakers and the axis of the median circuit breaker. It also shows the length a, which represents the distance between the median axes of the flanges 14, 15 and 16 of the two end elements 11 and 13 of the casing, and the median axis of the flanges 14, and 16 of the element median 12 of the casing, this median axis coinciding with that of the median circuit breaker. The length a is smaller than the length f, that is to say that the axes of the flanges 14, 15 and 16 of the two end elements 11 and 13 of the casing are not in the same vertical plane as that of the three parts of the casing, but are offset laterally towards the inside thereof. The pole pitch of the switchboard components connected to the flanges 14

  and 15, is therefore lower than that of the circuit breakers mounted in the casing 1.

  Figure 2 gives an overview of the components arranged in front of the busbar of a single-phase armored panel. Are successively attached to the housing flange 1, first a bushing insulator 2, then a busbar disconnector 3, then a spacer 4, finally a second busbar disconnector. We will recognize here the offset arrangement of the flanges 15 relative to the median plane

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  elements 11 and 13 of the casing 1, the pole pitch has components 2 to 5 being less than the pole pitch f of the parts 11, 12 and 13 of the casing 1 in

  which are placed the circuit breakers.

  FIG. 3 represents two adjacent tables 10 and 20 of unit width b. In addition to the components shown in FIG. 2, a three-phase armored busbar 6 is schematically represented with the drives 61 of the disconnectors, the drives 7 of the circuit breakers,

  as well as other shielding elements 8.

  The figure also represents the pole pitch a of the other components Io of the table arranged above each casing, as well as the distance d, greater than the pole pitch a, and also also greater than the pole pitch f of the circuit breakers, represented in FIGS. 1 and 2 , The length d symbolizes the distance between the axes of the neighboring exterior phases of the two adjacent tables. - The figure also shows the distance e which symbolizes space

  free access between the two tables 10 and 20.

Claims (3)

  1. Single-phase shielded panel for gas-insulated high-voltage switching installation, in which the three circuit breakers are arranged side by side, parallel in their shielded casing, at a prescribed spacing, in which the shielded casing of the three circuit breakers is provided with terminals directed in a plane vertically for the connection of the other components of the switchboard, and in which the other components, associated with one of the phases, of the switchboard are arranged above the corresponding circuit breakers and in the middle in a vertical plane characterized in that the distance (a) between the vertical planes assigned to the two end circuit breakers 1s and the vertical plane of the middle circuit breaker (12) is less than the distance (f) between the two end circuit breakers (11, 13) and the circuit breaker median (12).   2. Armored panel according to claim 1, characterized in that, the axes of the terminals (14, 15) of the armored casings (11, 12) of the two end circuit breakers and the axis of the corresponding armored casing are offset in the horizontal plane.   3. Armored panel according to claim 1 or 2, in which the shielded casings (11, 12, 13) of the circuit breakers are further provided with a front connection flange (16) for the connection of another component, characterized by the fact that the flanges (16) arranged on the front face also have the smallest distance (a).