FI67639C - UPPHAENGNINGSDON FOER EN HAENGSPIRALKABEL - Google Patents

Description

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Patent and Registration Office (44) tttMMIalpamft | · ku «L | ulkalMn pvm.—, /, Λκ

Patent- och regfaterityrelaen 1 7 AmOkan Mtb (d oeh utl ^ krtfuit p ^ bttcer *} -51 * 1 z -04 (32) (33) (31) «caoikau» —Safird prtoriMC 2A. 08.77

Sweden-Sweden (SE) 7709516-4 (71) (72) Roland Lindqvist, Bätsman Stens Väg 54, S-163 57 Spanga,

Clas T. Jacobsen, Tibaststigen 25, S-150 24 Ronninge,

Sweden-Sverige (SE) (74) Berggren Oy Ab (54) Suspension cable suspension -

Upphängningsdon för en hängspiralkabel

The invention relates to a suspension device according to the type definition of the appended claim 1 for hanging a suspension cable on a pole or the like.

In the electricity distribution, especially in the voltage range of 0.4-20 kV, more and more hanging cables, hanging spiral cables and ground cables are used instead of overhead lines, i.e. instead of uninsulated cables freely tensioned on each other. In low-voltage distribution up to 0.4 kV, overhead cables and ground cables have, in recent years, replaced the overhead lines almost completely due to technical and economic advantages.

In high voltage distribution, on the other hand, hanging cables have been used only to a limited extent due to the high equipment costs involved. Overhead cables have been used above all on cable sections where overhead lines are not suitable for local reasons. Underground cables, on the other hand, have been used extensively in cities and densely populated communities. Until now, hanging spiral cables with steel support ropes have only been used in test facilities.

2,67639

Swedish patent publication 7 408 937 proposes a hanging-twisted-pair cable for 0.4-50 kV, in which one phase conductor, in addition to its conductive function, acts as a support rope for normally occurring mechanical loads. During exceptional loads, on the other hand, e.g. due to snow or ice loads, or when wood or the like falls against a cable, other phase conductors, which are not normally mechanically loaded, must be able to withstand mechanical loads for a short time. This allows the electrical conductor to be used more mechanically, allowing the spans between the columns to be increased and the cost of the cord to be reduced.

The cable can also consist of a neutral conductor and a phase conductor, in which case the neutral conductor has a higher mechanical strength.

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In order not to jeopardize the operational reliability of the cable, the suspension device of such a suspended coil cable must be designed in such a way that the pushing, compressing and tensile stresses on the insulation of phase conductors which are not normally mechanically loaded must be kept to a minimum. The same applies to the phase and support conductor if the insulation is not removed.

This problem is solved by the suspension device according to the invention. Its features appear from the characterizing part of the appended claim 1.

According to the invention, the suspension device is then structured in such a way that the suspended helical cable is suspended or tightened on a post or similar fastener by at least one insulated

The invention will now be described in more detail with reference to the accompanying drawings, which show two exemplary embodiments. Further details are given in the attached subclaims.

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

Figure 1 shows a top view of a coupling point on a line with a hanging spiral cable 1 attached to a post 2. This is done by means of a cable holder 3, preferably made of metal and made in one or more parts, and an insulating inner member 4 in the holder. or multi-part. According to the embodiment shown, the cable holder 3 is suspended on a hook in a stud bolt 5 passed through a hole in the column. The suspension device according to the invention is used to tighten both cable pieces from the attachment point. In the case shown, two similar clamping devices are used, each of which consists of a one-piece or multi-part insulating sheath 6 arranged around the phase conductors 1. The sheath is provided with a friction-increasing coating. If the sheath 6 is multi-part, the parts can be suitably "buttoned" together both when the sheath is divided into one or more axial and radial planes and when the sheath has to be connected to adjacent, associated elements. There is a so-called a tensioning coil 7, in the case shown, made of one or more centrally bent conductors of suitable length. The parts are then twisted in opposite directions helically and placed around the sheath so that after a certain distance, which depends on the desired traction of the cable, they tighten inside the cable. At the bending point, the clamping coil 7 is fixed to the hook of the stud pin 5 by a clamping part 8, usually a clamping screw. The screw line sections can possibly be provided with a friction-increasing coating. Of course, fastening means other than the stud bolt shown according to the embodiment can also be used.

The suspension cable is installed on the column by placing the cable on one or more guide rollers placed in the suspension location. After tightening the cable, the insulating sheaths 6 and the associated tightening coils 7 and fastening parts 8 are fastened. The tightening parts 8 can then normally be tightened so much that the cable guide rollers can be removed and the cable holder 3 with its inserts 4 can be placed around the cable. After tightening the cable holder, the tightening of the tightening parts 8 can be carried out again by slightly loosening the cable load, so that the cable holder 3 can partially support it. In this installation work 4 67639, the casings 6 and the inner 4 must be limited to each other.

Figure 2 shows the clamping point of a hanging cable using a suspension device according to the invention. The cable is then again assumed to be a helical cable, which in this case has a specially shaped, combined phase and support conductor and two mechanically weaker phase conductors. The phase and support conductor 10 is provided with a suitable tension rope holder 11, in this case provided with a loop for a bracket 12, which is fastened by a tension member 13 and an additional shackle 14 to an insulator 15, which in turn is attached to a zinc 16 attached to a post 18 by a post. the other phase conductors 19 are provided with a suspension device according to the invention, which consists of an insulating sheath 20 and a tensioning coil 21 arranged around the tensioning member 13 and which can be tightened by means of this.

The phase and support conductor 10 can thus be further connected to the second conductor 22 at the loosening rope holder connected to the tensioning rope holder 11. The other phase conductors 19 can be accessed at the protruding part of the tensioning coil 21.

The tightening rope holder 11 shown can be pressed around the insulated phase and support conductor or connected to it by a bolt connection. The phase and support conductor 10 can also be tightened using a tightening coil. If the tension rope holder 11 is embedded in an insulating sheath to which a normal tensioning force can be applied, the insulator 15 can be omitted.

The support conductor can, of course, be a neutral conductor which can be gripped by the tension rope holder, while the tensioning device 20, 21 surrounds and tightens all the phase conductors of the cable.

Different clamping parts can provide the necessary cable tightening for both the phase and support conductor or the neutral conductor and other normally non-load-bearing phase conductors.

Instead of sheathed clamping coils, other clamping means, possibly using plastic wedges, can also be used to provide friction-increasing clamping of the entire cable or its individual phase conductors.

Claims (3)

67639 A suspension device for hanging a hanging spiral cable on a post (5; 16) fastener of a pole or the like (2; 18), wherein the hanging spiral cable (1) has insulating, twisted conductor parts and is intended mainly in the voltage range 0.4-50 kV, one or more phase conductor parts operating simultaneously as a support rope or cable consisting of a load-bearing neutral conductor part and normally non-load-bearing phase conductor parts, and wherein the suspension device consists of a sheath (6; 20) of substantially at least two phase conductor parts enclosing around the outer layer and insulating material (7); interlock to press the sheath (6; 20) around the phase conductor parts and with it (6; 20) to form a frictional tensioning member (6, 7; 20, 21) in the longitudinal direction of the suspension cable, characterized in that the tensioning member (6, 7; 20, 21) is suspended or tightened to the fastener (5; 16) by an adjustable adjusting element (8; 13), and that the the guide part or parts and / or the supporting neutral part are in turn hung or tightened on the fastener (5; 16) so that the tensile stress of the support rope and / or the supporting neutral conductor part is adjustable by the tensioning element (8; 13) in relation to the tensile stress of the tensioning member (6, 7; 20, 21). Suspension device according to claim 1, for tightening a suspension cable to a pole or the like, if the phase conductor is made as a phase and support conductor or if the cable includes a neutral conductor, characterized in that the phase and support conductor (10) or neutral conductor (10) ) is clamped to a post (18) or the like by an uninsulated tension rope holder (11) and an insulator (15) and that the clamping member and the sheath (20) and its frictional clamping member (21) are adapted to clamp other twisted phase conductors (23). ) to a column or the like (Figure 2). Suspension device according to claim 2, characterized in that the uninsulated tensioning rope holder (11) is embedded in an insulating sheath which is tensioned on a column or the like using an intermediate insulator. 6 67639