EP0889548B1 - Cable termination for a high current multi-conductor cable for DC applications - Google Patents

Description

The invention relates to a cable head of a high-current multiple cable for DC applications, in which the ends of a plurality of individual strands existing cable ropes in to the axis of a covered by an outer tube cylindrical portion of a cable lug concentrically extending bores inserted and by radial compression while deforming the holes in these are fixed in position, with a central cooling water channel in the middle of the cable lug and connected to the cooling water channel on the circumferential side of the cylindrical section Cooling water grooves are provided.

Such a cable head is known from DE 23 41 900 C3. Here are the the ends of the cable-receiving holes on a single pitch circle. This results in a large diameter of the outer tube, which means the bending radius a high-current multiple cable when used e.g. on a DC oven must be kept comparatively large. A large bending radius leads thus inevitably to a larger space requirement for the high-current multiple cable.

Starting from the prior art, the invention is based on the object of a Cable head of a high-current multiple cable for DC applications create, which is small in volume and therefore cheaper installation options of a high-current multiple cable allowed.

The solution to this problem is that the holes on partial circles are concentric to each other and the holes on the inner Pitch circle to the holes on the outer pitch circle are arranged on gap, the depth of the cooling water grooves between those on the outer pitch circle lying holes close to the arranged on the inner pitch circle Extends holes.

The invention thus provides a distribution of the bores and thus the ends the cable ropes over the entire cross section of the cylindrical portion of the cable lug in front. Because of this distribution, the diameter of the cable head in the Compared to the prior art can be kept smaller. By the in diameter smaller cable head is also a smaller diameter of the outer tube realizable. Hence the use of a cable head designed in this way leads equipped high-current multiple cable e.g. when planning a new or conversion of a direct current furnace to significant space savings due to the then smaller bending radius. It follows that the length of the cables is also reduced can be.

When using existing DC ovens and maintaining the cable length a longer lifespan of the cable because of the bending of the cable acting forces can be reduced. Alternatively, shortening the cable length lead to a weight saving.

In all applications, both the reduction in the outer tube diameter leads as well as the smaller cable head in addition to a weight reduction.

The fact that the depth of the cooling water grooves between the on the outer Pitch circle lying holes close to the arranged on the inner pitch circle Bores extends, the radial compression of the ends of the cable cables in the holes on the inner pitch circle, specifically over the groove bases cooling water grooves. This way the radial Pressing a uniform pressure distribution on each cable rope can be reached, since almost the same edge thicknesses for all holes distributed over the cross-section can be met.

Figur 1

in der Seitenansicht, teilweise im Schnitt, den Kabelkopf eines Hochstrom-Mehrfachkabels;

Figur 2

einen Querschnitt durch die Darstellung der Figur 1 entlang der Linie II-II während einer Montagestufe des Kabelkopfs und

Figur 3

einen Querschnitt durch die Darstellung der Figur 1 entlang der Linie II-II.

The invention is explained in more detail below with reference to an embodiment shown in the drawings. Show it:

Figure 1

in side view, partly in section, the cable head of a high-current multi-cable;

Figure 2

a cross section through the representation of Figure 1 along the line II-II during an assembly stage of the cable head and

Figure 3

a cross section through the representation of Figure 1 along the line II-II.

1 in FIG. 1 is the cable head of a high-current multiple cable 2 for DC applications designated.

The cable head 1 comprises a cable lug 3 made of copper or the like, which with a cylindrical section 4 is fixed in position in an outer tube 5. The over the end face 6 of the outer tube 5 protruding tongue-like part 7 of the cable lug 3 is used to connect to a conductor or consumer.

The cable lug 3 is traversed centrally by a cooling water channel 8, which on Free end 9 of the cable lug 3 has transversely directed connections 10. On the inside At the end 11 of the cable lug 3 there is a choke 12 as a transition to one the cooling pipe 13 passing through the high-current multiple cable 2.

From the end face 14 of the cylindrical section 4 of the cable lug 3 Bores 15, 16 as blind bores on two concentric to each other Sub-circles TK, TK1 introduced (Figures 1 and 2). Lie on each pitch circle TK, TK1 seven holes 15, 16. Here are the ones on the inner pitch circle TK1 Bores 16 to the holes arranged on the outer pitch circle TK 15 arranged on gap.

Extend between the holes 15 lying on the outer pitch circle TK approximately V-shaped from the outer peripheral surface 17 of the cylindrical portion 4 Cooling water grooves 18 with a depth T close to that on the inside Pitch circle TK1 lying holes 16. The groove bases 19 are rounded. The Cooling water grooves 18 run from the end face 14 of the cylindrical section 4 over a length that is slightly longer than the length of the holes 15, 16. Die inner ends of the cooling water grooves 18 are via inclined channels 20 with the in the central cooling water channel 8 extending the axis 21 of the cable lug 2.

The bores 15, 16 serve to receive and fix the ends 22 from a variety of individual strands 23 existing cable ropes 24. The definition of Ends 22 in the bores 15, 16 are carried out, as can be seen in FIG. 3, by a radial compression (P) of the material of the cylindrical section 4 and the ends 22. The ends 22 lying on the outer pitch circle TK of the circumferential surface 17 radially pressed, while that on the inner pitch circle TK1 lying ends 22 are radially pressed from the groove bases 19.

List of reference symbols

1 -

Cable head

2-

High current multiple cables

3-

Cable lug

4-

cylindrical section v. 3rd

5-

Outer hose

6-

Front of v. 5

7-

Part of 3rd

8th-

Cooling water channel

9-

free end of 3rd

10-

Connections to 9

11 -

inner end v. 3rd

12-

throttle

13-

Cooling water pipe

14-

Front of v. 4th

15-

Drilling on TK

16-

Drilling on TK1

17-

Circumferential surface v. 4th

18-

Cooling water grooves

19 -

Groove reasons

20th -

Inclined channels

21 -

Axis v. 3rd

22 -

· Ends of 24th

23 -

Single strands

24th -

Cable ropes

P-

radial compression

T-

Depth of 18th

TK -

outer pitch circle

TK1-

inner pitch circle

Claims (1)

1. Cable head of a high-tension multi-core cable (2) for direct-current applications, in which the ends (22) of the cable cores (24) consisting of a plurality of individual stranded wires (23) are inserted in bores (15, 16) extending concentric with the axis (21) of a cylindrical portion (4) of a cable terminal (3) enclosed by an external hose (5) and fixed in position in these through radial compression (P) deforming the bores (15, 16), and in the middle of the cable terminal (3) there is a central cooling water channel (8) and around the circumference of the cylindrical portion (4) there are longitudinally aligned cooling water grooves (18) connected with the cooling water channel (8), characterised in that the bores (15, 16) lie on concentric circles (TK, TK1) and the bores (16) on the inner circle (TK1) are disposed in the gaps between the bores (15) on the outer circle (TK), and the depth (T) of the cooling water grooves (18) between the bores (15) lying on the outer circle (TK) extends into the vicinity of the bores (16) disposed on the inner circle (TK1).

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