EP0524472A1 - Method for manufacturing a switch pole, device for carrying out this method, and switch pole for a medium or high voltage switch - Google Patents

Abstract

During the assembly of the switch pole (10), the individual parts (12, 14, 20, 24, 30) of the housing (36) are loosely stacked one on top of the other and fixed. This can be done by application of a partial vacuum in the interior of the housing (36) and/or by means of the holder (76). The spaces, which are open towards the top, between the fitting (18) and the supporting insulator (14), as well as between the fitting (28) and the switching chamber insulator (24) are filled with potting compound (38). Once this potting compound (38) has at least partially cured, the switch pole (10) is placed on the head by rotating the holder (76) about the horizontal axis (74), after which the spaces, which are now open towards the top, between the fitting (32) and the switching chamber insulator (24) as well as between the fitting (22) and the supporting insulator (14) are filled with potting compound (38). The enables simple assembly, automatic alignment of the contact pieces (48, 68) on top of one another and a sealing test, before the switch pole (10) is completely assembled. <IMAGE>

Description

The present invention relates to a method for producing a switch pole for a medium or high voltage switch according to the preamble of claim 1, a device for carrying out the method and a switch pole for a medium or high voltage switch.

A pressurized gas-insulated switch pole of a high-voltage switch manufactured using this known method is described in the SPRECHER ENERGIE catalog 42B4 "SF₆-circuit breaker". Prior to the pole assembly, the tubular support and switching chamber insulators, which are open in the axial direction, are provided with the corresponding metal fittings. These encompass the axial end regions of the insulators at a distance, and the space between the metal fittings and the insulators is filled with a casting compound for fastening to one another. During assembly, the post insulator is placed on the mechanism housing, an annular seal being placed beforehand on a sealing surface of the mechanism housing, on which the lower end face of the post insulator comes to rest. Then the post insulator is fastened to the latter by means of a set of screw connections, which are supported on the lower metal fitting and on the mechanism housing. An insulating drive rod extends through the support insulator in the axial direction and its lower end is via a lever-link mechanism with a seal that is inserted tightly into the mechanism housing and rotatably mounted thereon Drive shaft connected. An intermediate part is placed on the support insulator with the interposition of a likewise ring-shaped seal, on which the lower connection of the switch pole is provided and on which the movable contact piece to be connected to the drive rod was previously mounted together with a compression system for generating the extinguishing gas flow. The switching chamber insulator is then placed over this and fastened to the supporting insulator by means of a second set of screw connections which pass through the intermediate part and are supported on the fittings of the supporting and switching chamber insulators. A head housing, which carries a fixed contact piece which interacts with the movable contact piece, is placed on the switching chamber insulator with the interposition of an annular seal and fastened to the upper metal fitting of the switching chamber insulator by means of a third set of screw connections. The upper connection of the switch pole is provided on the head housing. Now that the switch pole has been assembled, a leak test can be carried out.

In order to ensure that the movable contact piece is precisely aligned with the fixed contact piece, the switching chamber insulator with the metal fittings attached to it is precisely measured beforehand in a jig, and fitting holes are drilled into the metal fittings, through which fitting pins are inserted during assembly. which are inserted through analog fitting holes in the head housing and in the intermediate part.

It can be seen that this type of assembly is time-consuming and, in particular, also resource-intensive and negative As a result of the gas-tightness test, the entire assembled pole must be dismantled again.

It is therefore an object of the present invention to propose a method for producing a switch pole for a medium-voltage or high-voltage switch which allows simple and, above all, less expensive aids to be installed.

This object is achieved by a method according to claim 1.

According to the method according to the invention, parts of the switch which have to be aligned with one another after the switch pole has been installed no longer have to be measured beforehand. Alignment can take place during assembly because the corresponding parts can be moved relative to one another due to the mobility of the fitting in question relative to the insulator. In addition, the storage is simplified and therefore more cost-effective, since it is no longer necessary to store insulators with cast fittings, but these parts can be stored individually and combined in particular if desired.

The mutual alignment of the interacting contact pieces can be carried out in a simple manner in that the movable contact piece is brought into the switch-on position. Since the switch parts are only placed loosely on top of each other, they can now be easily moved relative to each other, which automatically results in precisely aligned contact pieces leads. Since the fittings are only potted with the support and switching chamber insulators after the switch pole has been installed, it is possible to dispense with screw connections and to directly form the fitting parts on the mechanism housing, intermediate part and head housing, which results in fewer switch parts and, in particular, in less-to-be-sealed connection points leads. The entire pole can be tested for leaks before the post insulator is attached to the mechanism housing, the interrupter insulator to the post insulator and the head housing to the interrupter insulator. This also allows easy, quick disassembly if the leak test should show a negative result.

A device for carrying out the method according to the invention is specified in claim 9.

A switch pole for a medium or high voltage switch is defined in claim 11.

Preferred embodiments of the method and preferred embodiments of the device and the switch pole are specified in the dependent claims.

Fig. 1 und 2

im Vertikalschnitt, einen Schalterpol zu zwei verschiedenen Zeitpunkten seiner Herstellung;

Fig. 3

in Ansicht, den fertiggestellten Schalterpol;

Fig. 4

im Vertikalschnitt, den beim Kopfgehäuse geöffneten Schalterpol mit herausmontierten Teilen für Revisionsarbeiten.

The present invention will now be described with reference to an embodiment shown in the drawing. It shows purely schematically:

1 and 2

in vertical section, a switch pole at two different times of its manufacture;

Fig. 3

in view, the completed switch pole;

Fig. 4

in vertical section, the switch pole open on the head housing with parts removed for inspection work.

The switch pole 10 of a high-voltage circuit breaker shown in the figures, for example with SF₆ compressed gas, has a mechanism housing 12, for example made of cast aluminum, which forms the base of the switch pole 10. On the mechanism housing 12 is a ceramic, tubular support insulator 14, between the end facing the mechanism housing 12 and an appropriate sealing surface 12 'on the mechanism housing 12 an annular seal 16 is provided. An annular fitting 18 is formed on the mechanism housing 12 and protrudes with respect to the sealing surface 12 'in the direction toward the support insulator 14 and engages around its lower edge region 14' at a distance.

An intermediate part 20 is arranged on the support insulator 14, on which a sealing surface 20 ′ is likewise formed on the lower side facing the support insulator 14. Between the intermediate part 20 and the support insulator 14, a further annular seal 16 'is provided, which bears against the sealing surface 20' and at the upper end of the support insulator 14. An annular fitting 22 is formed on the intermediate part 20 and surrounds the upper end region 14 ″ of the post insulator 14 at a distance.

A likewise ceramic, tubular interrupter isolator 24 is placed on the intermediate part 20, the lower end face of which rests on an annular seal 26 which in turn rests on a further sealing surface 20 ″ formed on the intermediate part 20. The lower end region 24 'of the interrupter isolator 24 is also surrounded by a fitting 28 which is also integrally formed on the intermediate part 20.

At the upper end of the switching chamber insulator 24 sits a head housing 30 with the interposition of a further ring seal 26 ', which on its lower side facing the switching chamber insulator 24 also has a sealing surface 30' which interacts with the ring seal 26 'and on which a fitting 32 is also formed which protrudes towards the switching chamber insulator 24 with respect to the sealing surface 30 'and surrounds the upper edge region 24' 'thereof at a distance. The ring seal 26 'lies on the upper end face of the interrupter isolator 24.

On its upper side, the head housing 30 has an opening 31 which is approximately circular in cross section and which is closed in a gastight manner by a removable cover 34. The cover 34 is fastened to the head housing 30 by means of screws, not shown. The parts forming the housing 36 of the switch pole 10, namely the mechanism housing 12, the support insulator 14, the intermediate part 20, the switching chamber insulator 24 and the head housing 30 with the cover 34 are fastened to one another in that the spaces between the fittings 18, 22 and the Post insulator 14 and the spaces between the fittings 28, 32 and the switching chamber insulator 24 are poured out with a casting compound 38. The casting compound 38 does not perform a sealing function, but only provides the mechanically firm connection between the corresponding parts safely. The sealing function is performed by the seals 16, 16 'and ring seals 26, 26'.

A drive shaft 40 is tightly inserted into the interior of the mechanism housing 12 and is rotatably mounted on the mechanism housing 12 in a known manner. A drive lever 42 is wedged onto the drive shaft 40, at the free end of which an insulating drive rod 44, which passes through the support insulator 14 in the axial direction, is articulated. The upper end of the drive rod 44 is connected to a blow-out tube 46, at the upper end of which a tulip-shaped, movable contact piece 48 is fastened. In the region of the upper end of the blow-out tube 46, a base 50 of a compression cylinder 52 projects from the latter, the jacket 52 'of which coaxially surrounds the blow-out tube 46 at a distance. The base 50 has passages 54 running in the axial direction, which flow-wise connect the space delimited by the tulip-shaped contact piece 48 and an insulating material nozzle 56 surrounding it to a compression space delimited by the blow-out pipe 46 and compression cylinder 52 and an annular piston 58. The piston 58 is supported on supports 60 on the intermediate part 20 and is integrally formed thereon. Furthermore, the blow-out pipe 46 penetrates the intermediate part 20 and is slidably mounted thereon.

Furthermore, on the electrically conductive intermediate part 20, sliding contact pieces 62 are arranged, which bear on the outside of the compression cylinder 52 made of electrically conductive material on the jacket 52 ′ in order to electrically connect this to the intermediate part 20.

A lower connection 64 of the switch pole 10 is also formed on the intermediate part 20, as can be seen particularly well from FIG. 3.

On the substantially annular head housing 30, a contact carrier 66 is fastened, for example by means of screws, to which a tubular contact piece 68, which is arranged coaxially to the longitudinal axis of the switch pole 10, is fixed. This fixed contact piece 68 interacts with the tulip-shaped, movable contact piece 48 and is encompassed by it in an electrically conductive manner in the switched-on position, which is indicated by dashed lines in FIG. 1. It closes the neck of the insulating material nozzle 56, which is released again when it is switched off.

The upper connection 70 of the switch pole 10 is also formed on the head housing 30, as shown in FIG. 3. Furthermore, approximately coaxial sliding contact fingers 72 protrude in the interior of the housing 36 from the head housing 30 to the fixed contact piece 68, which in the switched-on position rest against the jacket 52 ′ of the compression cylinder 52 and a low-resistance electrical connection between the upper connection 70 and the lower connection 64 via the compression cylinder 52 and ensure the sliding contact pieces 62.

In FIGS. 1 and 2, the switch pole 10 is shown clamped in a holder 76 rotatable about the horizontal axis 74. This has a plate-like support member 78 for the mechanism housing 12 and a ring-like Holding member 80, which is supported on a shoulder 82 of the head housing 30 outside the region of the cover 34. The support member 78 and the holding member 80 are tensioned against one another by means of these tie rods 84 penetrating them. For this purpose, the tie rods 84 have threads in their end regions, on which nuts 86 sit. On the tie rods 84, pivot pins 88 are fastened approximately centrally, which run coaxially with the horizontal axis 74 and which are mounted on the side legs of a U-shaped support bracket 90. A hole 92 ′ is made on the crosspiece 92, which runs transversely to the lateral legs, in order to be able to hang the holder 76 for the storage or during the assembly of the switch pole 10 at the desired location.

Finally, it should also be mentioned that the mechanism housing 12 has a connecting piece 94 in order to enable the connection to a vacuum pump, a pressure source or a compressed gas filling device, for example for filling SF₆. Such a connection is indicated in FIG. 1 by line 96.

The jug-shaped casting ladle 98 shown in FIGS. 1 and 2 symbolically shows the pouring of the relevant spaces between the fittings 28 and 32 and the switching chamber insulator 24 with casting compound 38.

The switch pole 10 described above and shown in the figures is assembled as follows: The mechanism housing 12 with the drive shaft 40 preassembled thereon, the drive lever 42 and the drive rod 44 is placed on the support member 78. The annular seal 16 is placed on the sealing surface 12 ′ and the support insulator 14 placed on the seal 16. Subsequently, the intermediate part 20, together with the pre-assembled blow-out tube 46, contact piece 48, compression cylinder 52 and the insulating nozzle 56, is placed on the annular seal 16 'placed on the end face of the support insulator 14, the drive shaft 40 being rotated counterclockwise before being turned off by the To bring the drive lever 42 into the position indicated by dash-dotted lines in order to enable the upper end of the drive rod 44 to be connected to the blow-out pipe 46 without problems, for example by means of a pin. As a result of this position of the drive shaft 40, when the intermediate part 20 is switched off, all the parts connected to the blow-out pipe 46 remain in the switch-on position indicated by the broken line in FIG. After the ring seal 26 has been placed on the sealing surface 20 ″ of the intermediate part 20, the switching chamber insulator 24 is placed on this ring seal 26 and then the head housing 30 with the preassembled contact carrier 66 and contact piece 68 is placed on the end face of the ring chamber insulator 24 26 'removed. Since the movable contact piece 48 is in the switched-on position, the fixed contact piece 68 comes into engagement with the contact piece 48, so that the two contact pieces 48, 68 are necessarily aligned with one another. It should be noted that all parts of the housing 36 are loosely stacked on top of one another, so that alignment of the individual parts is still possible without any problems.

After the cover 34 has been placed on the head housing 30, the line 96 is now connected to a vacuum source, not shown, in order to evacuate the switch pole 10.

As a result, the loosely stacked parts are fixed against one another, and at the same time the tightness of the housing 36 can be checked. If the leak test should show defects, a quick and easy removal of the switch pole 10 is still possible. By placing the holding member 80 on the shoulder 82 of the head housing 30 and tensioning the tie rods 84 by means of the nuts 86, the switch pole 10 is fixed in the holder 76, and at the same time the seals 16, 16 ', 26, 26' are further pretensioned. If necessary, a further leak test can now be carried out by connecting the line 96 to a pressure source in order to generate excess pressure in the interior of the housing 36. If all quality-assuring controls have been positive by then, all open spaces between the fittings and insulators, in this case between the fitting 18 of the mechanism housing 12 and the support insulator 14 and the fitting 28 of the intermediate part 20 and the switching chamber insulator 24, are now included the casting compound 38 filled. After this casting compound has at least partially hardened, the switch pole 10 is turned upside down by rotating the holder 76 about the horizontal axis 74, as shown in FIG. 2. Now the spaces open towards the top between the relevant fittings and insulators, in the present case between the fitting 32 of the head housing 30 and the switching chamber insulator 24 and the fitting 22 of the intermediate part 20 and the supporting insulator 14, are filled with casting compound 38. As soon as this casting compound has at least partially hardened, the switch pole 10 can be turned back into its correct position. After the casting compound has hardened, the tie rods 84 and the holding member are released 80 removed from the head housing 30. The finished switch pole 10, as shown in FIG. 3, is now available for further quality assurance tests, such as pressure and / or break testing, and if necessary for filling up with compressed gas and for delivery.

For possible control and revision work, only the compressed gas itself has to be removed from the switch pole 10, and after the cover 34 has been removed from the head housing 30, the active switch parts are accessible. The fixed contact piece 68 can be removed from the switch pole 10 by loosening the contact carrier 66. The drive lever 42 is released by pulling out the drive shaft 40, after which the movable contact piece 48 with the insulating material nozzle 56, the compression cylinder 52 and the blow-out pipe 46 can be pulled upwards from the intermediate part 20, as shown in FIG. 4. The insulating drive rod 44 and the drive lever 42 are also carried along. The process of reassembling the parts removed from the housing 36 is carried out in the reverse order, with the pushing of the drive lever 42 onto the drive shaft 40 being made possible, for example, by providing two openings in the axial direction of the drive shaft 40 for reaching into the mechanism housing 12 are, the opening can be closed with a cover through which the drive shaft 40 does not penetrate to the outside.

It is of course also possible, according to the proposed method, to install switch poles in which the fittings surrounding the support insulator and switching chamber insulator are not attached to the mechanism housing, intermediate part and Head housing are molded. The fittings in question are fastened to the mechanism housing, intermediate part and head housing, for example by means of screw connections, and the parts of the switch pole 10 are loosely stacked and aligned before the spaces between the fittings and the insulators are then poured out.

The proposed method is suitable for producing switch poles for both high-voltage and medium-voltage switches, and for switches with ceramic insulators and those with plastic insulators.

If no inspection and inspection work is required inside the switch pole, a head housing can be provided without a removable cover.

Claims (13)

Method for producing a switch pole for a medium or high voltage switch, in which a support insulator (14) penetrated by an insulating drive rod (44) has a mechanism housing (12) at one end into which a drive element (40) connected to the drive rod (44) is sealed is introduced, and on the other hand with an intermediate part (20) carrying a connection (64) and electrically connected to a movable contact piece (48) coupled to the drive rod (44), and a switching chamber insulator (24) on one end with the intermediate part (20) and on the other hand, a head housing (30) carrying the other connection (70) and a fixed contact piece (68) cooperating with the movable contact piece (48) are mechanically firmly connected, the connections of the support insulator (14) to the mechanism housing (12) and Intermediate part (20) and the switching chamber insulator (24) with the intermediate part (20) and head housing (30) fittings (18, 22, 28, 32) are provided, each of which, on the one hand, by introducing casting compound (38) into the annular space between the relevant insulator (14, 24) and the fitting (18, 22, 28, 32) with the insulator (14, 24) and on the other hand are connected to the relevant part (12, 20, 30), characterized in that at least one fitting (18, 22, 28, 32) is first connected to the relevant part (12, 20, 30) and this part (12 , 20, 30) is aligned and only then this fitting (18, 22, 28, 32) with the associated one Insulator (14, 24) is shed. Method according to Claim 1, characterized in that the mechanism housing (12), the intermediate part (20) and the head housing (30) are connected to the corresponding fittings (18, 22, 28, 32), the mechanism housing (12), the post insulator (14), the intermediate part (20), the switching chamber insulator (24) and the head housing (30) are loosely stacked on one another, for aligning the contact pieces (48, 68) are brought into engagement with one another and then the parts (12, 14, 20, 24, 30) are fixed against each other and that the open spaces between the insulators (14, 24) and fittings (18, 28) are poured out, after the at least partial hardening of the casting compound (38) around the switch pole (10) an approximately horizontal axis (74) is turned over and the remaining spaces are poured out. Method according to claim 1 or 2, characterized in that the parts (12, 14, 20, 24, 30) of the switch pole (10) are stacked on top of one another in a holder (76) which can be rotated about the approximately horizontal axis (74). A method according to claim 3, characterized in that to fix the stacked parts (12, 14, 20, 24, 30) these are clamped against each other by means of the holder (76). Method according to one of claims 1 to 4, characterized in that for fixing the stacked parts (12, 14, 20, 24, 30) the switch pole (10) is evacuated. Method according to one of claims 1 to 5, characterized in that a leak test of the switch pole (10) is carried out before the casting. Method according to one of claims 1 to 6, characterized in that after the casting compound (38) has hardened, a pressure and / or break test is carried out on all the switch pole (10) in all fittings (18, 22, 28, 32). Method according to one of claims 1 to 7, characterized in that the fittings (18, 22, 28, 32) are molded onto the latter during the manufacture of the mechanism housing (12), intermediate part (20) or head housing (30). Apparatus for carrying out the method according to one of claims 1 to 8, characterized by a holder (76) rotatable about an approximately horizontal axis (74) with a support member (78) for the mechanism housing (12) and a holding member (80) for the head housing (30) in order to fix the switch pole (10) in the holder (76). Apparatus according to claim 9, characterized in that the support member (78) and the holding member (80) can be clamped against one another. Switch pole for a medium or high voltage switch, manufactured according to one of claims 1 to 8. Switch pole according to claim 11, characterized in that the fixed contact piece (68) is held by a contact carrier (66) which is removably fastened to the head housing (30) and the contact carrier (66) with the contact piece (68) is held by a cover (34). closable opening (31) in the head housing (30) can be removed from the switch pole (10). Switch pole according to Claim 12, characterized in that the movable contact piece (48) and the switch parts (46, 52, 56) moved with it can be removed from the switch pole (10) together with the drive rod (44) through the opening (31).

Images