FR2881571A1 - Unitary medium or high electric voltage protecting apparatus e.g. switch, has shielded insulating enclosure, and set of bars, integrated to rigid insulation, with connection units to connect to another set of bars of another apparatus - Google Patents

Abstract

The apparatus has a shielded insulating enclosure (1) constituted of lower and upper insulating shells (2, 3). The enclosure is filled with a non-polluting oil and has, between an external connecting device (9) and a set of bars (10), a bulb shaped vacuum switch. A portion of the bars is integrated to a rigid insulation and has at two opposite ends connection units (17) to connect to another set of bars of another apparatus.

Description

2881571 1

  HIGH OR MEDIUM VOLTAGE ELECTRICAL PROTECTION APPARATUS.

  The present invention relates to a medium or high voltage electrical protection device comprising a casing filled with a dielectric fluid, said envelope enclosing, between an external connection device and a busbar, a device for breaking the current.

  A device of the kind mentioned previously described in US Pat. No. 4,578,550 is known. This device is housed in a metal casing filled with oil. This envelope contains a set of bars, a vacuum bulb and a disconnector. This vacuum interrupter comprises a fixed contact electrically connected to an external connection device and a movable contact electrically connected to the disconnector, said disconnector comprising a movable contact capable of switching between a position of contact with the ground and a position of contact with a phase .

  One of the disadvantages of this device is its lack of modularity. Indeed, the realization of bipolar devices tripolar etc., comprising several electrical functions namely the switch function and the circuit breaker function, requires the realization of a specific metal tank with a mounting of the busbar in the complicated tank, the tank grouping by phase the devices providing the different functions. It is also not possible, for the same reason, to perform cell extensions.

  Another disadvantage is that the amount of oil required relative to the live parts, is important, given the presence of this metal vessel and because of the only use of this liquid dielectric for isolation, d where a large size of this device.

  The present invention solves these drawbacks and proposes a simple electrical protection device with a high modularity and a large capacity of extension while being compact.

  For this purpose, the subject of the present invention is a medium or high voltage electrical protection device, this device being characterized in that the envelope is made of an insulating material, and in that it comprises at least one portion of a game. modular bar 2881571 2 integrated solid insulation and having means for connection to another portion of busbar belonging to another device directly or via an intermediate conductor.

  The invention also relates to a medium or high voltage electrical protection device comprising a casing filled with a dielectric body, said casing enclosing, between an external connection device and a busbar, a device for breaking the current controlled by an actuator, this apparatus being characterized in that the casing is made of an insulating material and comprises a shield, in that the apparatus comprises a portion of a solid-insulated modular busbar and having connection means to another busbar portion belonging to another apparatus, directly or via an intermediate conductor, and a disconnector connected in series in the envelope with said breaking device, said disconnector being able to take several different positions allowing the circuit of to be closed, sectioned or open, or to the connection device to be grounded.

  In a particular embodiment, the bar game portion is reported on the device. In another embodiment, this bar game portion is integrated into the device.

  According to a particular embodiment, each portion of the busbar has at its two opposite ends connection means to another portion of the busbar.

  According to a particular characteristic of the invention, the aforementioned envelope comprises a shielding and the aforementioned connection means ensure the continuity of the shielding between said apparatus and another apparatus to which the first is intended to be connected.

  According to a particular characteristic of the invention, these connection means comprise male-type connection means and female-type connection means located respectively at the two opposite ends of the busbar portion.

  According to another particular characteristic of the invention, an elastomeric sleeve is interposed between the so-called female connection means of one of the apparatuses and the so-called male connection means of another apparatus.

  According to a particular characteristic of the invention, the sleeve comprises between the female connection means of one of the apparatuses and the male connection means of the other apparatus, a metallization layer intended to ensure the continuity of the shields between both devices.

  According to another particular characteristic of the invention, the aforementioned sleeve is of flattened frustoconical or flattened cylindrical shape.

  According to another particular characteristic, the aforementioned sleeve comprises an internal layer connected to the potential of the busbar and an outer layer connected to the potential of the shield.

  According to another feature, these female-type connection means comprise an insulating conical portion surrounding a conductive cylindrical end, a free space being interposed between these two parts, and in that the male-type connection means comprise an insulating conical portion surrounding a cylindrical conductive part.

  According to another characteristic, the sleeve comprises, on its edge in contact with the aforementioned female conductive cylindrical portion, a semiconductor layer capable of controlling the electric field in this zone.

  According to another characteristic, the sleeve comprises on its free edge, between the free end of the aforementioned insulating female conical portion and the male insulating conical portion, a metallization layer intended to ensure the continuity of metallization between said shielded female insulating conical portion. and the insulating conical male part.

  According to another characteristic, the cut-off device is a breaking bulb.

  According to another characteristic, the cut-off device comprising a fixed contact and a movable contact relative to the fixed contact, the aforementioned busbar portion extends substantially perpendicular to the axis of displacement of the movable contact.

  According to another characteristic, this device also comprises a disconnector connected in series with said cut-off device, said disconnector being able to take several different positions allowing the circuit to be closed, cut off, or open, or to the connection device to be grounded.

  According to another particular characteristic, the dielectric body is an oil-based compound.

  The present invention also relates to an apparatus comprising at least two so-called unitary devices having the above-mentioned characteristics taken alone or in combination, said devices being connected by their own actuator or another actuator or any other mechanical system and / or by the means connection, and each cut-off device of each device can provide a switch or circuit breaker function, said devices can be all arranged in the same position, or in a position angularly offset relative to each other with respect to the axis of portions of bar game.

  The invention also relates to a three-phase electrical protection device comprising a row of three unitary devices having the above-mentioned characteristics taken alone or in combination, said devices being mechanically connected to the actuator of their cut-off and severing device. .

  The invention also relates to a three-phase electrical protection device comprising two devices each comprising a row of three devices, each unit unit of each row having the above-mentioned features taken alone or in combination, each unit unit of one of the rows being connected to a unitary apparatus of the other row by the aforementioned connecting means, the cut-off devices being for the apparatuses of one of the rows, switches or circuit-breakers, and for the apparatuses of the other row, respectively circuit breakers or switches.

  The invention also relates to a three-phase electrical protection device comprising three devices each comprising a row of three devices, each unit device 2881571 5 each row having the aforementioned characteristics taken alone or in combination, each unit of one unit row being connected to a unitary unit of the adjacent row by the aforementioned connecting means, the cutoff devices being for the apparatus of the first and third rows, switches or circuit breakers, and for the apparatuses of the second row, respectively circuit breakers or switches.

  The invention also relates to a three-phase electrical protection device comprising three devices each comprising a row of three devices, each unit unit of each row having the above-mentioned features taken alone or in combination, each unit unit of one of the rows being connected to a unitary apparatus of the other row by the aforementioned connecting means, the cut-off devices being for the apparatus of the first and third rows, switches or circuit breakers, and for the appliances of the second row, respectively circuit breakers or switches, with for each circuit breaker, a departure to a transformer.

  But other advantages and features of the invention will appear better in the detailed description which follows and refers to the accompanying drawings given solely by way of example and in which: FIG. 1 is a perspective view of an apparatus for unitary electrical protection according to the invention, - Figure 2 is an axial sectional view illustrating the inner portion of said apparatus,-Figure 3 is a partial sectional view, illustrating a particular embodiment of the connection means according to the invention, - FIG. 4 is a partial sectional view, illustrating another particular embodiment of the connection means according to the invention; FIG. 5 is a perspective view of a three-phase electrical protection device according to the invention comprising the switch function, FIG. 6 is a perspective view of another particular embodiment of a three-phase electrical appliance according to the invention comprising the switch function and the FIG. 7 is a perspective view of another embodiment of a three-phase electrical protection device according to the invention comprising two switch functions and a circuit breaker function, and FIG. 8 is a partial view of a circuit breaker. section, illustrating another embodiment of the invention having a set of bars reported.

  In Figures 1 and 2, there is shown a unit voltage switch unit I according to the invention. This switch I comprises a shielded insulating jacket 1 constituted by an insulating lower tank 2 and an insulating upper tank 3, the two tanks 2.3 comprising an outer metallization layer 4. A soleplate 5 intended to seal is placed between the two vats 2,3.

  This casing 1 is filled with a dielectric fluid 6, which in a particular embodiment is non-polluting oil, and contains mainly a vacuum interrupter 7 in the form of a bulb, a disconnector 8 connected in series with the bulb 7 and a portion of integrated bar game 10. The vacuum interrupter 7 contains a fixed contact 11 electrically connected to an external connection device 9 and a movable contact 12 connected to the disconnector 8. This portion of the busbar 10 extends substantially perpendicular to the axis of displacement of the contact. mobile 12 of the bulb 7.

  The control device of the disconnector 8 and the control device of the bulb 7 (not shown) are located at the upper part 16 of the casing 2, a fluid-tight bellows (not shown) being placed between this upper portion 16 of the casing 2 and the control devices.

  This switch 1 also comprises connection means 17 of said busbar portion 10 to another busbar portion belonging to another apparatus of the same function or different function, intended to be associated with the first.

  These connection means 17, as illustrated in FIGS. 3 and 4, comprise so-called male connection means 18 located at one end of the busbar portion 10 and said female connection means 19, located at the other end of the helm portion. These so-called male connection means 18 comprise an insulating conical portion 20 surrounding a conductive cylindrical end portion 21, and the so-called female connection means 19 comprise a conductive cylindrical portion 22 surrounded by an insulating conical portion 23, said insulating portion. conical 23 constituting an extension of the insulating envelope 2.

  In Figure 3, the connection of two devices is illustrated. The insulated conical male portion 20 of one of the apparatuses is mounted inside the insulating female conical portion 23 of the other apparatus until the female conductive cylindrical portion 22 of this apparatus is in contact with the end of the male cylindrical conductive portion 21 of the first apparatus. A mechanical device makes it possible to exert in this place the contact pressures necessary to maintain a reduced contact resistance. In this particular embodiment, the connection means 17 according to the invention further comprise a conical sleeve 24 of elastomer placed between the insulating conical portion 23 of the female part and the male insulating conical portion 20 of the other device. This elastomeric sleeve 24 has an inner layer 25 set at the potential of the busbar and an outer layer 26 set to the potential of the mass. Thus, this sleeve 24 allows, on its edge 25 in contact with the female conductive portion 22 to avoid the presence of strong electric fields in areas that may be in the presence of air. On its edge 26 located at its free end, the sleeve 24 comprises a metallization layer to ensure continuity of the shield.

  In Figure 4, another embodiment of the connection means is described wherein the elastomeric sleeve 24 is of flattened cylindrical shape.

  FIG. 5 illustrates a three-phase apparatus according to the invention, constituted by three unitary switches 27, 28, 29 as described above. These three devices are mechanically connected by the actuator of the bulb, or by means of another mechanical structure and all perform the switch function.

  FIG. 6 illustrates an apparatus comprising two rows of unitary units, the first row consisting of three devices having the switch function 27, 28, 29 and joined at their actuator, while the second row consists of three devices 30 , 31,32 having the circuit breaker function together at the actuator also. Each unit 27,28,29 of one of the rows is connected to a unitary apparatus 30,31,32 located opposite the first, and belonging to the other row, via the connecting means 17 previously described. .

  FIG. 7 illustrates an apparatus consisting of three rows of three devices, the first row comprising devices 27, 28, 29 having the switch function, the second three devices 30, 31, 32 having the circuit breaker function, and the third, three devices 33, 34.35 the switch function also.

  Note that each device of the same function may have a specific actuator or not, said actuators may or may not be secured to each other, or be secured to a single actuator.

  It should be noted that the invention also relates to an apparatus comprising an unshielded envelope.

  FIG. 8 illustrates another embodiment of an apparatus according to the invention, in which the portion of busbars is not integrated in the envelope but reported on the apparatus, that is to say is located at the outside of the envelope. In this embodiment, the busbar comprises, as in the embodiments described above, at one of its ends, male-type connection means and at its opposite end, female-type connection means.

  It has therefore been achieved through the invention a medium or high voltage electrical protection device of simple design, having a high degree of modularity allowing the easy association of several poles in the same cell, and a possibility of increased extension, and allowing the easy association of tables between them. This is possible thanks to the design of modular devices and connection means that ensure the continuity of insulation and shielding from one device to another and from one table to another.

  Thus, it is possible to easily realize from the same basic device of single-phase devices, two-phase devices, three-phase etc., these devices having the function switch or circuit breaker. It is also possible to create rows providing a protection function and to associate these functions with each other by using the connection between them phase by phase modules, by connecting their busbar portions.

  The invention also significantly reduces the amount of fluid, especially oil, by the combination of a shielded insulating casing and the solid insulation of the busbar, resulting in a small footprint of the device. This will be obtained all the more easily as the respective permittivities of these two solid and fluid dielectric media will be close and that suitable shapes of the parts will be used.

  The invention also makes it possible to bring together the three functions namely cutting, sectioning and grounding in the same module.

  2881571 9 In addition, the assembly of the male / female type of busbars, allows easy assembly in the factory. But any other form of connection may be considered. It will be noted that the dielectric body may be any insulating medium which allows deformations, in particular gas or liquid.

  Of course, the invention is not limited to the embodiments described and illustrated which have been given by way of example.

  On the contrary, the invention comprises all the technical equivalents of the means described and their combinations if they are carried out according to its spirit.

Claims (23)

  1. Medium or high voltage electrical protection device comprising a casing filled with a dielectric body, said envelope enclosing, between an external connection device and a busbar, a device for shutting off the current controlled by an actuator, characterized in that that the envelope (2) is made of an insulating material, and that it comprises at least one integrated solid-insulated modular busbar portion (10) and having connection means (17) to another portion busbar belonging to another apparatus directly or via an intermediate conductor.   2. Medium or high voltage electrical protection device comprising a casing filled with a dielectric body, said envelope enclosing, between an external connection device and a busbar, a device for breaking the current controlled by an actuator, characterized in that the casing is made of insulating material and comprises a shield, in that the apparatus comprises a bar-shaped portion (10) with solid insulation and having connection means (17) for another portion of the game of bars belonging to another apparatus, directly or via an intermediate conductor, and a disconnector (8) connected in series in the envelope with said breaking device (7), said disconnector (8) being able to take several different positions allowing the circuit to be closed, sectioned or open, or the connecting device to be grounded.   Electrical protective device according to claim 2, characterized in that the above-mentioned busbar portion (10) is attached to the apparatus.   Electrical protection device according to claim 2, characterized in that the aforementioned busbar portion (10) is integrated in the apparatus.   2881571 11 5. Electrical protection device according to any one of the preceding claims, characterized in that each busbar portion (10) has at its two opposite ends, connecting means to another portion of the busbar.   6. Electrical protection device according to any one of claims 1 to 5, characterized in that the aforementioned envelope (1) comprises a shield and in that the aforementioned connection means (17) ensure the continuity of the shielding between said device and another device to which the first is to be connected.   7. Electrical protection device according to any one of claims 1 to 6, characterized in that these connection means (17) comprise male-type connection means (18) and female-type connection means (19). , respectively located at opposite ends of the busbar portion (10).   8. Electrical protection device according to any one of claims 1 to 7, characterized in that an elastomeric sleeve (24) is interposed between the so-called female connection means (19) of one of the apparatus and the means male connectors (18) of another apparatus.   9. Electrical protection device according to claim 8, characterized in that the sleeve (24) comprises between these female connection means (19) and these male connection means (18), a metallization layer intended to ensure the continuity of the shielding.   10. Electrical protection device according to claim 8 or 9, characterized in that the aforementioned sleeve (24) is flattened frustoconical shape or flattened cylindrical.   11. Electrical protection device according to any one of claims 8 to 10, characterized in that the aforementioned sleeve (24) comprises an inner layer (25) connected to the potential of the busbar (10) and an outer layer (26). ) connected to the potential of the shield.   2881571 12 12. Electrical protection device according to any one of claims 7 to 11, characterized in that these female type connection means (19) comprise an insulating conical portion (23) surrounding a conductive cylindrical portion (22), a space free connection being interposed between these two parts (22,23), and in that the male-type connection means (18) comprise an insulating conical portion (20) surrounding a cylindrical conductive portion (21).   13. Electrical protection device according to any one of claims 8 to 12, characterized in that the sleeve (24) comprises, on its edge (25) in contact with the aforementioned female conductive cylindrical portion (22), a semi layer -conduit capable of controlling the electric field in this area.   14. Electrical protection device according to any one of claims 8 to 13, characterized in that the sleeve (24) has on its free edge (26) between the free end of the aforementioned insulating female conical portion (23). and the male insulating conical portion (20), a metallization layer for providing continuity of metallization between said female insulating conical portion (23) and the male insulating conical portion (20).   15. Electrical protection device according to any one of the preceding claims, characterized in that the cut-off device is a breaking bulb (7).   Electrical protective device according to one of the preceding claims, the cut-off device (7) having a fixed contact (11) and a movable contact (12) with respect to the fixed contact (11), characterized in that the said busbar portion (10) extends substantially perpendicular to the axis of movement of the movable contact (12).   17. Electrical protection device according to any one of claims 5 to 16, characterized in that it also comprises a disconnector (8) connected in series with said cutoff device (7), said disconnector (8) being able to take several different positions allowing the circuit to be closed, sectioned or open, or the connecting device (9) to be grounded.   18. Three-phase electrical protection device according to any one of the preceding claims, characterized in that the dielectric fluid is an oil-based compound.   Electrical protection apparatus characterized in that it comprises at least two so-called unitary devices according to any one of the preceding claims, said devices being connected by their own actuator or another actuator or any other mechanical system and / or by aforementioned connection means, and each device of cut-off device being able to provide a switch or circuit breaker function, said devices being able to be arranged, all in a same position, or in a position angularly offset relative to each other, with respect to the axis of the bar game portions.   20. A three-phase electrical protection device comprising a row of three so-called unitary devices (27, 28, 29) according to any one of claims 1 to 18, said devices being mechanically connected to the actuator of their cut-off device ( 7) and sectioning.   21. Three-phase electrical protection device comprising two devices according to claim 20, each unitary device (27,28,29) of one of the rows being connected to a unitary device (30,31,32) of the other row by the aforementioned connection means (17), the cut-off devices (7) being for the appliances of one of the rows, switches or circuit-breakers, and for the appliances of the other row, respectively circuit-breakers or switches.   22. Three-phase three-phase electrical protection device according to claim 20, each unitary device (27, 28, 29) and (30, 31, 32) of one of the rows being connected to a unitary device (30, 31, 32) and (33,34,35) of the adjacent row 2881571 14 by the aforementioned connecting means (17), the cut-off devices (7) being for the first (27,28,29) and third (33) , 34,35) rows, switches or circuit breakers and, for the apparatuses (30,31,32) of the second row respectively, circuit breakers or switches.   23. Three-phase three-phase electrical protection device according to claim 20, each unitary device (27,28,29) and (30,31,32) of one of the rows being connected to a unitary device (30,31, 32) and (33,34,35) of the other row by the aforementioned connection means (17), the cut-off devices (8) being for the apparatuses of the first (27, 28,29) and third (33, 34,35) rows, switches or circuit breakers and, for the apparatuses (30,31,32) of the second row, respectively circuit breakers or switches with, for each circuit breaker, a departure to a transformer.