FR1465683A - Outdoor electrical installation at medium or high voltage - Google Patents

Description

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Outdoor electrical installation at medium or high voltage. The invention, due to the collaboration of MM. Paiil Mondoulet and Maurice Voulat relates to medium or high voltage outdoor electrical installations comprising at least one busbar arranged above at least one outdoor circuit breaker.

In the case of medium, high, or very high voltage outdoor stations where at least one circuit breaker can be connected to at least one busbar, the minimum area occupied by the station is determined by the size of the circuit breaker (s). - tor (s) and (or) set (s) of bars which are generally juxtaposed. In the case of the double busbar extension of existing single busbar substations, this is generally not available. not enough space to install the second busbar next to the first set.

The first object of the invention is to allow this extension of existing stations when there is not enough room to install the busbars and a circuit breaker one beside the other.

Another object of the invention is to allow the transformation of a single busbar station according to the invention into a double busbar station in the same size, with very few adjustments.

Another object of the invention is to reduce the horizontal bulk of outdoor stations comprising two circuit breakers connected to a single busbar.

Yet another object is to protect the busbars and the circuit breakers of outdoor stations against bad weather and in particular against lightning strikes.

Yet another object of the invention is to limit the damage in the event of an explosion of a circuit breaker or of a measuring transformer.

Yet another object is to permit and facilitate safe on-the-job maintenance of each of the elements of outdoor stations of the kind mentioned.

The electrical installation according to the invention is characterized in that each busbar is enclosed in a closed compartment comprising an earthed metal casing protecting the bars and the other material placed inside the central compartment from external agents. such as rain, disconnectors with rotating bushings connecting the bars to the poles of the circuit breaker.

Two embodiments of the invention will now be described by way of non-limiting examples with reference to the accompanying drawings, in which.

FIG. 1 is an elevational view, partially in section, of a station according to the invention comprising two sets of bars cooperating with a circuit breaker; FIG. 2 is an elevation, partially in section, of a station according to the invention with a single busbar cooperating with two juxtaposed circuit breakers.

In FIG. 1, the output conductors 10 of a three-phase circuit breaker 11, placed on the earth, drive a receiver, not shown, such as a transformer.

The opposite terminals 12 of the circuit breaker are connected by conductors 13 to the terminals of two three-phase disconnectors with rotary bushings 14. respectively 15. These bushings, the lower insulating part of which is equipped for the outside, that is to say offers a sufficiently long escape path when this part is exposed to bad weather, pass through the floor of closed compartments. 16 and 17 comprising an earthed metal casing protecting the bars and the other material disposed inside the compartment against external agents such as rain. The terminals on

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18, respectively 19 of the disconnectors are connected to the corresponding phases of two three-phase busbars 20 and 21, each bar of which is individually coated with insulating material which makes it possible to join. the three bars of each set. The bars and the upper parts of the disconnectors are thus protected from the elements. and lightning strikes. On the other hand, the compartments form corridors and the visible opening made by the disconnectors allows personnel to access the compartments in complete safety. The compartments 16, 17 are carried by a suitable frame 22 and the arrangement of the compartments above the circuit breaker 11 prevents contamination of the latter by dust, rain, snow, etc. The arrangement according to the invention also makes it possible to eliminate the guard wires of the busbars, 23 denotes measurement transformers.

Figure 2 shows an outdoor station according to the invention with two three-phase circuit breakers 24, 25 connected respectively to the lower terminals 26, 27 of two three-phase disconnectors 28, 29 whose rotary bushings pass through the floor of the closed compartment 30 comprising a metal casing - earthing lique protecting the bars and other equipment placed inside the compartment against external agents such as rain. The opposite terminals of the disconnectors are connected to a single three-phase busbar set 31, each bar of which is: individually coated in insulating material. This execution provides the same advantages as those described above.

Claims (1)

SUMMARY 1 Outdoor electrical installation at medium or high voltage comprising at least one busbar arranged above at least one outdoor circuit breaker, characterized in that each busbar is enclosed in a closed compartment comprising a earthed metal enclosure protecting the bars and other equipment placed inside the compartment against agents. exterior such as rain, disconnectors with rotating bushings connecting the bars to the poles of the circuit breaker; 2 Installation according to paragraph 1, characterized in that the bars are individually coated with insulating material in a manner known per se; 3 Installation according to paragraph 2 with two sets of bars characterized in that the bars of the two sets are arranged in mixed phases.