SE410924B - SUSPENSION DEVICE FOR A HANGING SPIRAL CABLE - Google Patents

Description

15 20 25 30 35 40 77095164 »loads. Under exceptional loads, on the other hand, for example due to snow or ice loads and tree falls or the like against the cable, the other, normally mechanically unloaded phase conductors must be able to absorb mechanical loads for a short time. As a result, the electrical conductor material will be utilized better in mechanical terms, whereby the spans between the posts can be increased and the wiring cost reduced.

The cable can also consist of neutral conductor and phase conductor, whereby the neutral conductor has greater mechanical strength.

In order not to jeopardize the operational reliability of the line, the suspension device for such a hanging spiral cable must be designed so that shear, compressive and tensile loads on the insulation of the normally mechanically unloaded phase conductors are kept to a minimum. The same applies to the phase and support conductor if it is not stripped. This problem is solved by a suspension device according to the invention. It is apparent from this characterizing part of the appended claims 1.

According to the invention, the suspension device is designed such that the hanging spiral cable is suspended in or clamped against the bracket on the post or the like by means of at least one insulated against the outer layer of at least two of the twisted phase conductor parts and in the longitudinal coil cable which radially compresses the phase conductor parts.

The invention will be explained in more detail in connection with the accompanying drawings, which show two embodiments. Further details can also be found in the attached subclaims.

In the drawings, Fig. 1 shows suspension according to the invention of a hanging spiral cable along a line and Fig. 2 suspension according to the invention when tensioning a hanging spiral cable.

Fig. 1 shows from above a breaking point on a line with a hanging coil cable 1 which is attached to a post 2. This is done with a cable holder 3, preferably of metal and made of one or more parts, and an insulating insert 4 in this, which can also be done in a _ or fléfg parts. According to the embodiment shown, the cable holder 3 is suspended on a hook on a pin bolt 5, which is passed through a hole through the post. Suspension devices according to the invention are used to provide tension on the two cable sections from the attachment point. In the case shown, two equal relaxers are used, each consisting of a one- or multi-part insulating sleeve 6, which is laid around the phase conductors 1. The sleeve is optionally provided with a friction-increasing surface coating. If the cuff 6 is multi-parted, the parts ... a - 10 15 20 25 30 35 40 7709516 '-4 3 can suitably be "buttoned" together, which applies both if the cuff is divided into one or more axial and radial planes or if it Around the cuff 6 is a so-called tensioning coil 7, in the case shown made of one or more mid-bent wires of suitable dimension, the parties being opposite helically turned and laid around the cuff, so that they along At the bending point, the tensioning coil 7 via a clamping element 8, usually a clamping screw, is attached to the hook on the pin bolt 5. Optionally, the screw line parts can also be provided with friction-increasing coating. fastening means other than the pin bolt shown according to the embodiment can also be used. ~ The mounting of the hanging spiral cable in the post takes place by laying the cable over a or r several guide rollers, which are mounted next to the suspension point. After stretching the cable, the insulating cuffs 8 and associated tensioning coils 7 and clamping elements 8 are applied. Normally the clamping elements 8 can then be tightened so much that the cable guide rollers can be removed and the cable holder 3 with insert U can be fitted around the cable. After pulling out the cable holder, any necessary relief of the cable, so that it is partially supported by the cable holder 3, can then be made possible by loosening the clamping elements 8 again slightly. During this assembly work, the cuffs 6 and the insert R must come into contact with each other.

Pig. 2 shows a relaxation point for a hanging spiral cable with the use of suspension devices according to the invention. The cable is then again assumed to be a hanging spiral cable and in the case shown this has a specially designed combined phase and support conductor and two mechanically weaker phase conductors. The phase and support conductor 10 is provided with a suitable clamping holder 11, which in the case shown is provided with a loop for a shackle 12, which is attached via a clamping member 13 and a further shackle 14 to an insulator 15, which in turn is mounted next to a fastening iron 16, which with single post bracket 17 is fastened to a post 18. The two other phase conductors 19 are provided with a suspension device according to the invention, consisting of an insulating sleeve 20 and a tensioning coil 21, which is laid around the tensioning member 13. and can be stretched with the help of this. The phase and carrier conductor 10 thus becomes available for further connection to another conductor 22 at a slackline holder which is connected to the span holder 11. The other phase conductors 19 become available

Claims (3)

The part shown emerging from the tensioning coil 21. The tension line holder 11 shown can be pressed around the insulated phase and support conductor or be connected to it via a bolted connection. The relaxation of the phase and support conductor 10 can also take place using a relaxation coil. If the tension line holder 11 is embedded in an insulating housing, at which the normal clamping force is allowed to act, the insulator 15 can be disconnected. Of course, the carrier conductor may consist of a neutral conductor, at which: the pin holder is allowed to act, while the clamping devices 20, 21 enclose and clamp all the phase conductors in the cable. With the various clamping elements, the required cable tension can be obtained, both for the phase and support conductor or the neutral conductor and for other, normally non-supporting phase conductors. Instead of tensioning coils with cuffs, other clamping means, possibly those which use plastic wedges, can also be used to provide a friction-increasing clamping clamping of the cable as a whole or of individual phase conductors therein. _ Patent claims Suspension means for suspending a hanging spiral cable in a bracket (53 16) on a post (2; 18) or the like, which hanging spiral cable (1) has insulated, twisted conductor parts and is intended for the main voltage range 0.4 - 50 kV, wherein one or more phase conductor parts simultaneously serve as a support line or the cable consists of a supporting neutral conductor part and normally non-supporting phase conductor parts, characterized in that the suspension device is designed so that the hanging spiral cable (1) is suspended in or clamped against the bracket (5, 16) by means of at least one insulated and frictionally clamped member (6,7; 20,21) abutting against the outer layer of at least two of the twisted phase conductor parts (6,7; 20,21), which is supported by said bracket and which in radial joint compresses the phase conductor parts¿ in that each clamping member consists of an enclosing material around the outer layer of at least two phase conductor parts, 1 substantially evenly thick cuff (6; 20) -dispersing material, on the outer surface of which a The tensioning means (73 21) known per se is arranged, which consists of a substantially U-shaped bent wire suspended at the bending point, each leg being in each helical direction with a relatively large pitch enclosing the sleeve in its longitudinal direction, the tensioning means now possibly arranged clamping elements (8 | 13) and any insulators (15) arranged are clamped against said bracket (5; 16). 7709516-4 Suspension device according to claim 1, intended for tensioning a hanging spiral cable in a post or the like, if a phase conductor is designed as a phase and support conductor or if the cable contains a neutral conductor, characterized in that the phase and support conductor (10) or the neutral conductor (10) via an uninsulated clamping line holder (11) and an insulator (15) is clamped against the post (18) or the like and that the clamping device with cuff (20) and its frictionally clamping means (21) is arranged to clamp the others, pop twisted: phase conductor (23) against the post or the like (fig. 2) Ä Suspension device according to claim 2, characterized in that the uninsulated clamping line holder (II) is embedded in an insulating housing, which is clamped to the post or the like, without the insertion of an intermediate insulator. PROMISED PUBLICATIONS: Sweden patent applications 5,995/69, 1,603/74 France 1,286,744, 1,375,815