SE460164B - 2-WATER LOCK IN THE MUFF AREA FOR ELECTRIC CABLES AND PROCEDURES FOR PREPARING A SEED - Google Patents

Description

460 10 15 20 25 30 35 164 2 to the socket in both directions connecting the metallic cable sheath and thus lead to damage to the insulation.

Metallic socket housings that are commonly used in cable laying technology and in molded form, for example, can form a transverse water barrier, are especially for thermal reasons less suitable for use in energy cables for the transmission of higher voltages.

The object of the invention is to achieve a durable and even at higher operating voltages secure protection against moisture diffusion in the socket area for electrical energy cables. The object is achieved according to the invention by means of longitudinally directed and longitudinally covering metallic sheet metal or foil strips, which are distributed on the circumference of the sleeve, the edge areas of the circumferentially distributed sheet metal or foil strips overlapping each other like roof tiles and in the overlapping area. together.

Thanks to the mutual overlap of the connection, the longitudinal metal strips guarantee - regardless of the outer shape of the socket body, eg double cone, single cone or cylinder - a waterproof seal in the socket area at a smooth surface, without blistering air inclusions.

In the overlap area, the sheet metal or foil strips are tightly connected to each other. Arbitrary adhesives in paste form, even weakly conductive ones, can be used for this purpose. In carrying out the invention, however, it has been found suitable to use for tight connection such sheet metal or foil strips which are coated on one or both sides with a hot-melt adhesive, so that the connection can only take place in the assembled condition by temperature influence. This significantly facilitates the assembly and adaptation of the "housing" to the outer sleeve shape. Deviating from this, it is often advantageous if the sheet metal or foil strips 10 15 20 25 30 35 460 164 3 consist of aluminum which on one side or on both sides has a In connection with, for example, winding bodies of self-welding or adhesive polyethylene tapes used as sleeve bodies, the copolymer coating of the sheet metal or foil strips results in a particularly reliable connection with the bridge element of the sleeve, also for higher operating voltages.

The strip width of the plates or foils is suitably 3-7, preferably 4-6 cm. Thereby a sufficient guarantee is obtained for good mountability and sufficient overlap with very varying external shapes on the sleeve body. The number of sheet metal strips is selected according to the outer diameter of the sleeve body. Of course, a round cover of the sleeve area is required.

If plate or foil strips designed according to the invention are used, it is ensured that the mutual displaceability of the strips required for adaptation to the sleeve shape remains until the final fixing on the sleeve body. The assembly of the displaceable sheet metal or foil strips is considerably facilitated if the metal strips are fixed by means of adhesive strips running along the circumference of the sleeve. In this assembled condition, the strips can be easily laid around the socket body in question during assembly. After the bonding or welding of the strips to each other and, for example, with a sleeve body below, the longitudinal sheet metal or foil strips are sealed at their respective ends together against the cable surface.

The longitudinal sheet metal or foil strips can be applied to, for example, a wound sleeve body in the most diverse ways. In carrying out the invention, such a method has proved to be particularly advantageous in which, at the prepared place of the cable connection, the sheet metal or foil strips held together already like overlapping roofs like sheet metal are laid around the insulating body in question 460 164 10 15 20 25 30 35 4 and these strips are fixed after the complete enclosure of the insulating body in this position. The sheet metal or foil strips are then flattened and finally adhered to each other by the effect of temperature and possibly with the insulating body.

It is also advantageous to fix the sheet metal or foil strips laid like a cuff around the insulating body through a connecting band winding.

This tape winding then remains in the sleeve area.

For bonding or welding together the individual sheet metal or foil strips in the transverse water barrier, the required amount of heat can be created by means of known, transportable heating ovens or radiators, as well as by means of electric heating sleeves or the like. It is particularly convenient and easy to assemble, however, to apply a shrink tubing to the sheet metal or foil strips, possibly with the aid of an insulating intermediate layer, such as the already mentioned strip winding, and to ensure that the elevated temperature required for shrinking this tubing is simultaneously achieved. more an adhesion or welding of the plate or foil strips together. Simultaneously with the increase in temperature, an elevated, versatile pressure is exerted on the blinds or foil strips enclosing the louvre body, which leads to a particularly tight and uniform bonding or welding.

The invention will now be described in more detail with reference to the accompanying drawing, in which Figs. 1 and 2 illustrate the pre-assembly of the sheet metal or foil strips and Fig. 3 illustrates a socket for high-voltage cable in the assembled condition.

The aluminum foils 1, for example 1400 to 1600 mm long, designed as a transverse water barrier for a 10 kV high-voltage cable, for example 1400 to 1600 mm long, coated on both sides with ethylene copolymers, for example 50 mm wide, overlap like roof tiles with 10 mm. This louver is assembled by means of the two adhesive strips 2. The roof tile ('42 \ I 10 15 20 25 30 35 .b- C \ CI) ... t O \ .län 5 equal the overlap of the aluminum foils l is particularly clear in fig 2.

On a reduced scale with respect to Figs. 1 and 2, Fig. 3 shows the construction of a cable sleeve according to the invention.

The conductors of the cable ends 3 and 4 are connected to each other in a known manner in the socket area and the stripped cable ends are insulated after bridging of the inner and outer conductor layers by means of a winding of eg self-welding polyethylene strips 5.

Arranged thereon is the outer conductor layer 6, for example of a self-welding, conductive strip, which is covered by the braided hose 7 of copper. Of course, this structure can also have a different shape.

It is now crucial for the invention to make this socket area, no matter how the substructure is designed, waterproof. For this purpose, the blinds 8 illustrated in more detail in Figs. 1 and 2 serve by the aluminum strips 1 running in the axial direction and overlapping each other like roof tiles. By displacing the individual strips relative to each other, after laying the blinds around the copper-braided hose 7, also to conical sleeve bodies so that creasing is avoided.

Preferably, the transverse water barrier (louver 8) from the center of the sleeve is wound around, for example with a transparent polyethylene strip 9 in one or more turns, after the aluminum strips have been smoothed so that they are adapted to the contour of the upper surface. The longitudinal strip 1 otherwise protrudes beyond the sleeve area to over the cable ends, where they can be sealed by means of a special sealing winding.

If, in connection with the assembly of the aluminum foils 1 and after the application of the strip layer 9, the shrink tubing 10 is applied over the connection point and heated to shrink temperature, for example 175 ° C, this temperature increase will cause a fusion of the facing copolymer layers on the individual aluminum foil strips. and 460 10 15 164 6 with the adjacent polyethylene layers. The pressure produced simultaneously by the shrink tubing 10 leads to a compact adhesion of all the participating building elements.

This is especially true for the reason that by means of the louver-like arrangement of the individual foils 1 these are still displaceable relative to each other and thereby adaptable to the prevailing substrate, up to the solidification of the copolymer used as adhesive.

When in the implementation of the invention a problem could lie in providing a secure electrical contact between the copper braid hose 7 and the thin aluminum strips 1, it can advantageously be arranged that a toothed plate-like contact band 11 is arranged over the copper braid hose 7. The upwardly pointing teeth of this toothed plate engage with contact in the upper surface of the aluminum strips 1 and thus ensure an electrically well-conducting connection between the aluminum strips 1 and the underlying copper braid hose.

Claims (10)

10 15 20 25 30 460 164 PATENT REQUIREMENTS 1. l. Transverse water barrier in the socket area for electrical cables, in particular high-voltage electrical cables with a sheath having a metal sheath, characterized by longitudinally directed metallic sheet metal or foil strips covering the sleeve area (1), which are distributed in on the circumference of the sleeve, whereby the edge areas of the sheet metal or foil strips distributed on the circumference overlap each other like roof tiles and are in the overlapping area tightly connected to each other. Transverse water barrier according to Claim 1, characterized in that the metallic sheet metal or foil strips (1) are coated on one side or on both sides with an adhesive, for example a hot-melt adhesive. Transverse water barrier according to Claim 1 or 2, characterized in that the metallic sheet or foil strips (1) consist of aluminum which is coated on one side or on both sides with a copolymer, for example an ethylene copolymer. Transverse water barrier according to one of Claims 1 to 3, characterized in that the strip width is 3-7 cm, preferably 4-6 cm. 5. Transverse water barrier according to one of Claims 1 to 4, characterized in that the sheet metal or foil strips (1) are fixed by means of adhesive strips (2) running along the circumference of the sleeve. Transverse water barrier according to one of Claims 1 to 5, characterized in that the longitudinally directed sheet metal or foil strips (1) are sealed together at both ends against the cable surface. Method for producing a transverse water barrier in the socket area for electrical cables according to one of Claims 1 to 6, characterized in that sheet metal or foil strips (1) are laid on the prepared site of the cable connection (1). like a cuff around the insulating body, the edges of which strips are then joined together with overlap like roof tiles, and these strips are fixed after the complete enclosing of the insulating body in this position, that the sheet metal or foil strips are then smoothed and finally stapled or welded to each other and possibly to the insulating body through temperature influence. 8. A method according to claim 7, characterized in that the sheet metal or foil strips laid similarly around the insulating body are fixed by a connecting band winding (9). 9. A method according to claim 7 or 8, characterized in that a shrink tubing (10) is applied to the sheet metal or foil strips, possibly with the aid of an insulating intermediate layer (9), and that the shrinkage hose required for shrinking this tubing elevated temperature at the same time is made to achieve at least one mutual welding or welding of the sheet metal or foil strips. Method according to one of Claims 7 to 9, for producing a transverse water barrier of aluminum sheet or a corresponding foil and a screen in the socket area, characterized in that the transverse water barrier is obtained in electrical contact with the screen (7). , for example consisting of a copper braided hose, by means of a tooth plate (ll) lying over the screen.