FR2786945A1 - Electrical cut-out for medium and high tension use includes reversible support for attachment to overhead cable support poles - Google Patents

Abstract

The cut-out may be attached to support poles in two configurations according to the cable positions. The medium and high tension cut-out device comprises a box (100) which contain the cut-out mechanism. The box provides a sealed container for the mechanism with an integral step down transformer, and arc-extinguishing gas. This box has attached a reversible console which fits on top of the box, enabling the box to be attached to its support in one of two positions symmetrically placed 180 degrees apart, according to which side the source of supply is placed w.r.t. the box. The console (500) has an arched shape in the form of a U whose cross-section is complementary to that of the box.

Description

The present invention relates to electrical cut-off devices for

  exterior, in particular for an assembly installed at the top of posts, for

  medium and / or high voltage shutdown.

  Many electrical switching devices have already been proposed for this purpose. However, to the knowledge of the Applicant, the known electrical cut-off devices are not entirely satisfactory. The present invention therefore aims to improve the electrical cutoff devices for medium / high voltage. According to a first aspect of the present invention, the aforementioned object is achieved by means of a device comprising a housing which houses electrical cut-off means and means for hooking the box on a support, characterized in that the hooking means comprise a reversible console on the housing to allow to selectively hang the housing on the support in two symmetrical positions from one another at 1800, depending on whether the power source in

  voltage is located on one side or the other of the case.

  According to a second aspect of the present invention, this object is achieved by a device comprising a box which houses electrical cut-off means and means ensuring an electrical connection through at least one wall of the box, which crossing means comprise a conductor central surrounded by an electrically insulating element, characterized in that the electrically insulating element comprises a rigid body of synthetic material surrounded by a sheath of silicone material. According to an advantageous characteristic of the present invention, the rigid body of synthetic material is formed of resin

epoxy.

  According to another advantageous characteristic of the present invention, an adhesive means is provided between the rigid body of material

  synthetic and the sheath in silicone material.

d -1, -, -

  According to another advantageous characteristic of the present

  invention, the sheath made of silicone material is provided with annular fins.

  According to a third aspect of the present invention, the aforementioned object is achieved by means of a device comprising a housing which houses electrical cut-off means characterized in that the housing is

  made of metal and the fact that it houses a voltage transformer.

  According to another advantageous characteristic of the present

  invention, the metal housing has truncated wall angles.

  Other features, purposes and advantages of this

  invention, will appear on reading the detailed description which follows,

  and with reference to the appended drawings, given by way of nonlimiting example, and in which: - Figure 1 shows a general view of an electrical cut-off device according to the present invention installed at the top of a pole, - the 2 shows a schematic view in horizontal section of an electrical cut-out device housing according to the present invention, FIG. 3 represents a view of means for passing through the walls of the housing according to the present invention, according to a top half view in axial section, - Figure 4 shows a similar partial view in axial section of the crossing means at the level of the electrically insulating body, - Figure 5 shows a partial in vertical section of the electrical switch box according to the present invention, - the FIG. 6 represents an external lateral view of the same housing, and - FIGS. 7, 8 and 9 respectively represent two orthogonal lateral views between e them and a top view of a console

  support according to the present invention.

  We see in Figure 1 attached, an electrical cutoff device according to the present invention placed in a housing 100 fixed at the top of a pole P. The electrical cutoff device itself can be the subject of many variants and will therefore not be described in the

detail later.

  We can find examples of embodiment of such means of electrical cut-off in documents FR-A-2693834, FR-A-2683673, FR-

  A-2685540, FR-A-2762710 and FR-A-2675944.

  These electrical cutoff means placed in the housing 100 are preferably controlled mechanically using a rigid rod T which runs along the pole P from the base of the housing 100 and which terminates at the bottom of the pole in a system. manual or mechanized control

  schematized under the reference Sc.

  More precisely still, the electrical cut-off means are placed between two sections Lil and Li2 of an average electrical line or

  high voltage, by way of non-limiting example at 20,000 volts.

  These two sections Lil and Li2 of lines to be separated on command are mechanically connected to the top of the post P by any means

  suitable, for example using insulators 11,12.

  The phase conductors of a first section Lil are connected to respective means T1 passing through a first vertical face of the housing 100. The phase conductors of the second section Li2 are connected symmetrically to respective means T2 passing through a second

  vertical face of the housing 100, opposite the first aforementioned.

  Preferably, the system is completed by means capable of limiting the possible overvoltage at the level of the phase lines. Such overvoltage limiting means can be formed of a surge arrester based on varistors, interposed for example between the phase lines and the neutral or

  the mass as shown diagrammatically under the reference Pa in FIG. 1.

  Of course, inside the housing 100 the actual electrical cutoff means are interposed between the crossing means T1

and the crossing means T2.

  To control the associated electronic cut-out management system, it is generally necessary to have a low power supply

voltage, for example 240/300 Volts.

  It is conventional for this to lower the high or medium voltage (20,000 volts for example) using a step-down transformer located outside the housing 100, preferably at the top of the pole P. However, it is recommended in the context of the invention of

  place such a transformer 200 inside the housing 100.

  Thus, at no additional cost, using the box 100 of the electrical cut-off means, effective protection of the transformer

against the weather.

  More specifically, in the context of the present invention, the

  housing 100 is preferably made of folded and welded sheet metal.

  More precisely still, preferably, in its vertical part the housing 100 comprises: two parallel parallel and opposite main vertical walls 110, 112, each receiving in a position juxtaposed vertically the three crossing means T1 and respectively the three crossing means T2 associated with the two sections of lines Lil and Li2, two secondary vertical walls 114, 116, mutually parallel and perpendicular to the aforementioned main walls 110, 112 and 20. four sections of vertical walls 120, 122, 124, 126 respectively ensuring the connection between the adjacent vertical edges of the walls

  main 110, 112 and secondary 114, 116 mentioned above.

  Thus, as can be seen in FIG. 2, seen in horizontal section, the housing 100 has a polygon section of the octagon type. Thanks to this arrangement (in particular elimination of any conventional right angle on known housings), a housing having a

optimal mechanical resistance.

  In the context of the invention, the housing 100 is formed of a sealed structure and houses a neutral gas or self-extinguishing electric arc,

for example SF6.

  In FIG. 5, there has been illustrated under the reference 210, 212 the large gauge input conductors of the transformer 200 connected to the high voltage phase sections and under the reference 220 the smaller caliber output conductors, corresponding to the low voltage (240/300 Volts) and directed to the electronic cut-off management system, for the supply thereof, housed for example in an auxiliary box B in

bottom of post.

  It will also be noted that in order to avoid any ignition between the high voltage phase lines and the box 100 despite the presence of the transformer 200 inside the metal box 100, it is essential to route the large-gauge conductors 210, 212, inside the housing, at a minimum sufficient distance from the nearest housing wall 100. In the context of the invention, this minimum distance is fixed at

61 mm.

  Thus, as can be seen in FIG. 5, preferably the two large conductors 200, 212 have essentially a horizontal section serving for connection to the transformer 200 and a vertical section ensuring the connection on the internal end to the housing 100 d 'a

respective crossing T1.

  We will now describe the structure of the crossing means Tl, T2, in accordance with the present invention. These means are preferably identical on the one hand, between the inlet bushings T1 and the

  T2 output crossings and between phases on the other hand.

  Essentially, each of these crossings TI, T2 comprises a central electrical conductor 300, a rigid body of electrically insulating material 330 and an external sheath with fins of material

silicone 360.

  The central electrical conductor 300 is made of any suitable metal known to those skilled in the art (aluminum for example). It preferably has a constant section. If necessary, this central electrical conductor 300 can be curved over a part of its length, preferably external to the housing 100, to ensure the connection to the

  sections of lines Lil and Li2 optimally.

  However, preferably the central electrical conductor section 300 located on the outside of the housing 100 and adjacent respectively to one of the walls 110, 112, is straight and coaxial with the conductor section

  central electric 300 located inside the housing 100.

  The electrical connection on the ends of the central electrical conductor 300, respectively inside the box 100 (to cooperate with the mechanical cut-off means) and outside the box (to ensure the connection to the line sections Lil and Li2 )

  may be the subject of numerous variant embodiments.

  It will be noted that according to the nonlimiting embodiment illustrated in the appended figures, preferably the end of the conductor 300 situated inside the housing 100 has a tapped blind bore 302 for the connection of clamp 400 or equivalent means belonging to the system of electric cut. Furthermore, the end of the conductor 300 located outside the housing 100 can be flattened in the form of a blade

  304 with 306 holes for electrical connection.

  If necessary, the conductor 300 can, over a part of its length situated inside the rigid electrically insulating body 330, have a zone provided with a knurling 310 in order to ensure a satisfactory mechanical connection between the conductor 300 and the rigid body 330 which surrounds it. By way of nonlimiting example, it may be a straight knurling.

in steps of 1 mm.

  In the context of the present invention, the electrically insulating body 330 is made of rigid synthetic resin. It's about

  preferably an epoxy resin.

  As can be seen in FIG. 4, this body 330 made of epoxy resin can be overmolded on at least one frame 332 capable of forming a capacitor in cooperation with the conductor 300 to allow measurement

  voltage on each phase line.

  This capacitive voltage measurement system will not be described in more detail below. If necessary, the skilled person can refer

in document FR-A-2698695.

  This voltage measurement device can also be supplemented by a current measurement system, based on toroids engaged on the outside of each crossing T1 and / or T2 as illustrated on the

Figure 6 under reference 334.

  The geometry of the rigid electrically insulating body 330 in

  epoxy resin can be the subject of many variants.

  Preferably, the epoxy body 330 has an element 336 designed to be placed inside the housing 100 and which has a flat face 338 in the form of a crown centered on the axis O-O of the conductor 300 and perpendicular to this axis O-O. This flat face 338 is intended to come to rest against the internal face of one of the walls 110, 112. Preferably, the element 336 has inserts 339, such as threaded inserts which open onto the bearing face 338 for securing a crossing T1 or T2 on said wall 110, 112 of the housing 100 using

additional screwing means.

  These 339 inserts can also be used to ensure

  a voltage tap on the armatures 332.

  The element 336 preferably has a convergent section, that is to say which is reduced, away from the support phase

  338 towards the inside of the housing 100.

  More specifically, the element 336 illustrated in FIGS. 3 and 4 has a first section 3360 of cylindrical envelope of revolution adjacent to the support phase 338 and a frustoconical section 3364 tapered towards the free end of the body 330, linked together by a section

  intermediate 3362 in the shape of an O-ring.

  By way of nonlimiting example, for a central aluminum conductor 300 with a diameter of around 25mm, the axial length of the element 336 can be around 77.5mm, and the internal diameter of the support surface 338 of the order of 70 mm, while the external diameter of

  this bearing surface is of the order of l 00mm.

  The element 340 of the body 330 located outside the housing 100 preferably has a symmetrical envelope of revolution around

  the axis O-O and tapered away from the surface 338.

  Even more precisely, preferably, as can be seen in FIG. 4, this element 340 is formed from three sections juxtaposed axially: - a first section 342 adjacent to the surface 338, for example with a length of the order of 181 mm , and having a small angle of convergence (for example a diameter of 70mm at its end adjacent to the surface 338 and a diameter of the order of 58mm at its opposite end). - A second section 344 having a greater angle of convergence relative to the axis O-O, for example of the order of 30; this second section 344 can have, for example, a length of the order of 20 mm, and - a third end section 346 having an even greater angle of convergence, for example of the order of 60; the length

  of this section 346 is for example of the order of 5mm.

  The connection zones 343 and 345 defined between the pairs of adjacent sections 342/344 and 3441346 are preferably formed by roundings, for example with an average radius of the order of 5mm, to avoid

any peak effect.

  By way of nonlimiting example; the mean diameter of the area of

  link 345 between the two sections 344 and 346 is of the order of 34mm.

  As indicated above, each crossing T1, T2 is

  completed by a 360 silicone sheath with fins.

  More specifically still, the silicone sheath 360 covers the entire element 340 of the body 330 outside the housing 100 and extends on the conductor 300 clearly beyond the epoxy resin body 330. Thus, preferably the sheath 360 does not does not extend inside the housing 100. Typically, the silicone sheath extends outside the epoxy resin body 330 on the conductor 300 over a distance of the order of

270mm.

  The fins 362 provided on the sheath 360 are formed of annular structures generally perpendicular to the axis O-O. These fins can be the subject of numerous variant embodiments. They are preferably part of an outer envelope of appreciably diameter

  constant to allow the passage of toroids 334.

  As can be seen in FIG. 3, these fins 362 preferably originate on the portion of the sheath 360 which covers the body 330, having a progressively increasing height away from the wall 338. In this portion of sheath 360 the fins 362 have

  advantageously a pitch of the order of 25mm.

  In the sheath portion 260 located beyond the epoxy body 330, on the central conductor 300, the fins 362 have a larger diameter, for example of the order of 840mm, and a smaller pitch, for example of the order 12.5mm (with if necessary as seen on the

  Figure 3, an alternation of two diameters of fins 362).

  In the context of the present invention, the minimum thickness of the silicone sheath 360 over most of its extent covering the central conductor 300 is 3mm, while the minimum thickness of this silicone sheath 360 over its extent covering the sections 346, 344, and the portion

  adjacent section 342 is at least 5mm.

  By way of nonlimiting example, the fins 362 extend at least over a length of 75mm over the portion directly covering the central conductor 300. It is thus provided at this level, for example seven fins. According to another important characteristic of the invention, there is provided a layer of a material ensuring intimate adhesion between the respectively external faces of the body of epoxy material 330 and the adjacent internal surface of the sheath of silicone material 360. This agent allows at the same time ensuring sealing, strengthening the system on the climatic level (sealing against pollution and rain) and perfecting the dielectric strength. It will be noted that the crossing structure which has just been described makes it possible in particular thanks to the geometry of the body 330 and to its direct fixing to the housing wall 100 to ensure the mechanical support of the

  fixed contacts 400 participating in the cut.

A I to I L J

  As indicated above, preferably, the housing 100 is provided with means for hooking the housing to the post P, comprising a reversible console 500 on the housing 100 to allow the housing 100 to be hooked selectively on the support P in two symmetrical positions from one another at 1800, depending on whether the power source station

  is located on either side of the housing.

  Illustrated in Figures 7, 8 and 9, an example

  preferential for producing such a console 500.

  According to the embodiment illustrated in these figures, the console 500 comprises in the upper part an arch 510 in the general shape of a U whose cross section is complementary to that of the housing 100. Thus, the arch 510 comprises a flat core 512 intended to rest against one of the secondary faces 114 or 116 of the housing 100 and two lateral branches 514, 516 orthogonal to the core 512 and intended to be placed against the

  external surface of the main walls 110, 112 of the housing.

  It will be noted that the branches 514, 516 are connected to the ends of the core 512 by oblique facets 513, 515 homologous to the walls of

  connection 120, 122, 124, 126 of the housing.

  The core 512 is provided with holes 5120 for fixing on one of the secondary walls 114, 116. Similarly, the lateral branches 514, 516 are provided with holes, ages 5140, 5160 for fixing the console 500 on the upper part of the main walls 110, 112 and secure the fixing of hooks, as illustrated under the reference 550 in FIG. 10 intended to ensure the suspension of the housing 100 at the top of the pole P. The lateral branches 514, 516 can also used to fix means for supporting line connecting sections as shown diagrammatically under

the reference 560 in FIG. 6.

  Those skilled in the art will understand that depending on whether the core 512 of the console 500 is fixed against the wall 114 or the wall 116, said wall 114 or said wall 116 is placed against the post P and thus the housing 100 can be selectively fixed in one or other of the two authorized positions depending on whether the power source station is located on the right or on the left of the housing 100. In FIG. 6, there is thus shown respectively in solid lines and in broken lines , the position occupied by the hooks 550

  according to the positioning of the console 500 on the housing 100.

  The console 500 also has a support leg 520 formed by a generally rectilinear blade which projects downwards from the middle of the core 512. Preferably, this leg 520 has structures 522 folded outwards , that is to say opposite the branches 514, 516, intended to rest against the post P to provide support

vertical of the housing 100.

  The console 500 is preferably made of stainless steel.

  Of course the present invention is not limited to the particular embodiments which have just been described but extends to all

variants according to his spirit.

I I! L It 12 -

Claims (15)

CLAIMS R E V E N D I C A T I 0 N S   1. Electric cut-off device for medium and high voltage comprising a box (100) which houses electric cut-off means, characterized in that it comprises hooking means comprising a console (500) reversible on the box (100 ) to allow the housing (100) to be hooked selectively on the support (P) in two positions symmetrical to one another at 180, depending on whether the power source in   voltage is located on one side or the other of the case.   2. Device according to claim 1, characterized in that the console (500) comprises in the upper part an arch (510) in general U shape whose cross section is complementary to that of the housing (100).   3. Device according to one of claims 1 or 2, characterized by   the fact that the arch (510) comprises a flat core (512) intended to rest against one of the secondary faces (114, 116) of the housing (100) and two lateral branches (514, 516) orthogonal to the core (512) and intended to be placed against the external surface of the main walls (110, 112) of the housing.   4. Device according to one of claims 1 to 3, characterized by the   fact that the branches (514, 516) are connected to the ends of the core () by oblique facets (513, 515) homologous to the connecting walls (120, 122, 124, 126) of the housing.   5. Device according to one of claims 1 to 4, characterized by the   fact that the core (512) is provided with holes (5120) for fixing   on one of the secondary walls (114,116) of the housing.   6. Device according to one of claims 1 to 5, characterized by the   fact that the lateral branches (514, 516) are provided with holes (5140, 5160) for fixing the console (500) on the upper part of the main walls (110, 112) and if necessary ensuring the fixing   various accessories such as hooks (550). 13 -   7. Device according to one of claims 1 to 6, characterized by the   causes the console (500) to further have a support leg (520) formed of a generally straight blade which projects downward from the middle of the core (512) and has folded structures (522) outwards, that is to say opposite the branches (514, 516), intended to rest against   the post P to provide vertical support for the shoemaker (100).   8. Device according to one of claims 1 to 7, characterized by the   the console (500) is made of stainless steel.   9. Device according to one of claims 1 to 8 comprising   means (T1, T2) providing an electrical connection through at least one wall (110, 112) of the housing (100), which crossing means (T1, T2) comprise a central conductor (300) surrounded by an electrically insulating element (330, 360), characterized in that the electrically insulating element comprises a rigid body (330) made of material   synthetic material surrounded by a sheath (360) made of silicone material.   10. Device according to claim 9, characterized in that the   rigid body (330) of synthetic material is formed of epoxy resin.   11. Device according to one of claims 9 or 10, characterized by   the fact that it includes an adhesive means between the rigid body of material   synthetic (330) and the sheath (360) made of silicone material.   12. Device according to one of claims 9 to 11, characterized by   the fact that the sheath (360) made of silicone material is provided with fins annulars (362).   13. Device according to one of claims 9 to 12, characterized by   the fact that the housing (100) is made of metal and that it houses a voltage transformer (200).   14. Device according to one of claims 9 to 13, characterized by   the fact that the metal housing (100) has truncated wall angles.   15. Device according to one of claims 9 to 14, characterized by   the fact that the metal housing (100) has a horizontal cross section in octagon.