FR2777128A1 - THREE-PHASE ARMORED CIRCUIT BREAKER HAVING SHIELDING ELEMENTS - Google Patents

Abstract

Three-phase circuit breaker of a shielded high-voltage switching installation, characterized by the fact that, among the two diameters (D and d), the connection holes having the clamps for fixing the shielding element (1), one corresponds to the diameter (D) of the first hole fitted with the flange (31) for fixing the shielding casing (30) and the other corresponds to the diameter (d) of the second hole fitted with the flange (32) for fixing the the shielding envelope (30).

Description

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  The three-phase shielded circuit breaker having shielding elements The invention relates to the field of electrical energy distribution; it applies to the construction of shielding elements intended, in high voltage switching installations shielded on the three phases and insulated with gas, to be connected to the flanges of the enclosure

  cylindrical shielding of a circuit breaker.

  In known high-voltage shielded switching installations, having a three-phase circuit breaker, the cylindrical shielding casing of the circuit breaker comprises a first radial connection hole for the passage of the current conductors to one of the sides of the contact contact system. cut of each phase, and a second radial hole for the passage of

  current conductors to the other side of the breaking contact system.

  On these two holes of the shielding envelope are mounted respectively fixing flanges for the connection of a shielding element. These elements are generally tubular in shape and also have two connection holes provided with a fixing flange (US Pat. No. 4,503,481). The shielding elements lead, on the one hand, to the busbar or the busbars of the installation, and, on the other hand, to a cable outlet or to a transformer or another device. At the transition to the busbar, there is generally mounted a combined disconnector / earthing switch device and at the transition to the outgoing cables or other, a current transformer. But eventually, the

  transition to the busbar may include an intensity transformer.

  The current transformer and the connection to the busbar may require different connection diameters for the two fixing flanges of the shielding casing of the circuit breaker. As a rule, we

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  however provides for the same diameter. However, since the shielding envelope of a current transformer thus connected requires a larger diameter, this is frequently divided transversely, the connection flanges being in the separation plane, larger than those of the envelope shielding.

  Starting from a circuit breaker having the characteristics defined above

  above, the invention aims to reduce the space which is needed to house converter elements and to improve the possibility of modular use

of these shielding elements.

  To obtain this result, in accordance with the present invention, it is provided that, among the two diameters of the connection holes with their fixing flanges of the shielding element, one corresponds to the diameter of the first hole having the fixing flange shielding envelope, and the other to the diameter of the second connection hole having the

  corresponding fixing flange of the shielding casing.

  Such a dimensioning of the connection holes and the fixing flanges in the shielding casing of the circuit breaker and of the shielding elements which are connected to it makes it possible to mount the shielding element on each of the holes of the shielding casing of the circuit breaker. It is thus possible to mount shielding elements of different lengths, so that, for example, two elements of identical or different length can be connected to each other at their largest hole with a shielding element of greater length, and connected by one of the smaller connection holes, to the shielding casing of the circuit breaker. If the shielding element is connected to the shielding casing of the circuit breaker through its largest connection opening, the constituent elements, in particular the cores of the current transformers, which carry the shielding element, penetrate into the shielding envelope through the hole thereof. A connection of this kind between a shielding element and the shielding envelope of a circuit breaker is known per se, for a single-phase circuit breaker with an axial connection hole for the passage of current to one of the sides of the

  breaking contact system (DE 43 14 821 AI).

Preferably:

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  - the shielding element is connected to the hole corresponding to the smallest diameter having the corresponding fixing flange of the shielding envelope, - to this shielding element, is connected another shielding element of the same kind as regards the two hole diameters

  connection provided with their fixing flange.

  - the shielding element is connected to the larger diameter connection hole by the fixing flange of the shielding casing of the circuit breaker, - this shielding element being provided with intensity transformer cores, which partially penetrate into the shielding cover of the circuit breaker. Figures 1 to 4 show three embodiments of shielding elements according to the invention, as well as their arrangement relative to a circuit breaker shielding envelope. They represent: Figure 1 a short shielding element Figure 2 a long shielding element Figure 3 a combination of the shielding elements of Figures 1 and 2, and Figure 4 a connection of shielding elements according to Figures 1

  and 3 to the shielding envelope of a circuit breaker.

  FIG. 1 represents a short shielding element, of tubular shape, which can be connected to a connection hole of the shielding casing of a circuit breaker. The element has for this purpose a first fixing flange 10 of larger diameter D and a second fixing flange 11, of smaller diameter d. In the region of the second flange 11 is fixed an insulator 12 supporting three phase conducting elements 13, 14. Inside the shielding element, a core 15 of an intensity transformer

  is arranged around each conductive element.

  FIG. 2 represents a shielding element 2, which also comprises a first flange 20 of larger diameter D as well as a second flange 21 of smaller diameter d, this element however being longer than the shielding element 1 shown in Figure 1. Around each phase conducting element 23 and 24, are arranged in this case four

  circular cores of an intensity transformer.

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  In Figure 3 are joined two shielding elements 1 and 2 in a common element, at the ends of which appear the small flanges

diameter d.

  FIG. 4 is a schematic representation of a vertical circuit breaker 3 of a shielded high-voltage switching installation, gas insulated, the shielding casing 30 of which has a first connection hole having fixing flanges 31 for the passage of the conductors to one of the sides of a breaking contact system, and a second hole, also radial with fixing flange 32 for the passage of the conductors to the other side of the contact system. The fixing flange 31 has a diameter D and the flange 32, a diameter d. A shielding element 1 is connected to the flange 31, and to the flange 32, an element constituted by the assembly of elements 1 and 2. The latter forms a cross element, which gives the

  transition between the circuit breaker and a busbar.

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Claims (4)

  1. Three-phase circuit breaker of a shielded, gas-insulated high-voltage switching installation, the cylindrical shielding casing of which has a first radial hole for the passage of the current conductors to one of the sides of the cut-off contact system. each of the phases, and a second radial hole for the passage of the current conductors to the other side of the breaking contact system, io0 the two holes of the shielding casing have different diameters and each of the holes is provided with '' a fixing flange for the connection of a connecting shielding element, at least one of the two shielding element is tubular in shape and also has two connection holes each having a fixing flange, characterized by the fact, that among the two diameters (D and d), connection holes having the fixing flanges (10 and 11) of the shielding element (1), one corresponds to the diameter (D) of the first hole provided with the flange ( 31) for fixing the shielding envelope (30) and the other corresponds to the diameter (d) of the second hole provided with the flange (32) for fixing the shielding envelope (30). 2. Circuit breaker according to claim 1, characterized in that, 6 2777128   that the shielding element (1) is connected to the hole corresponding to the smallest diameter (d) having the corresponding fixing flange (32) of the shielding casing (30) and that, to this shielding element (1) , is connected another shielding element (2) of the same kind with regard to the two diameters (D,   d) connection holes provided with their fixing flange.   3. Circuit breaker according to claim 2 characterized in that,   that the two shielding elements (1 and 2) are of different length.   4. Circuit breaker according to claim 1, characterized in that the shielding element (2) is connected to the larger diameter connection hole (D) by the flange (31) for fixing the shielding envelope of the circuit breaker (3), this shielding element being provided with cores (25) of current transformers, which partially penetrate into the casing (30) of shielding of the circuit breaker.