DE3220067A1 - IMPROVEMENTS IN ELECTRICAL CABLE CONNECTIONS AND / OR CABLE TERMINATIONS - Google Patents

Description

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DESCRIPTION

The invention relates to improvements in electrical Cable connections and / or cable terminations and is concerned in detail, but not exclusively, with the connection and / or the termination of elastomeric cables in which the conductor insulation comprises an elastic polymer which is in is usually extruded directly onto the cable core during the manufacture of the cable, and in which one or several shields and / or other layers overlying the elastomer are provided in the usual way.

As is well known, the joining and / or termination of such elastomeric cables requires the removal of some Layers of cable over a length of the cable, the length of these layers being removed by the method used for connection or termination of the cable depends. Removal of the shielding layer or other layers leads lead to an increase in electrical loads on the cut off End, and the procedures used to connect and / or terminate the cable must take this into account and measures to reduce the loads to acceptable levels. Earlier cable connection and / or termination processes required the construction of the cable profile at the connection or termination point Wrapping with insulating tape and enclosing electrically conductive wire windings or metal foil or tape, that were connected to the cut back cable shield. Subsequent developments worked with pre-formed pressure cones made of epoxy resin material for the construction of the connection or end profile, and even more recent Developments, particularly for the connection and / or termination of elastomeric cables, have preformed components made of elastic polymer intended to be pressed onto the cable, such components, which have semiconductor layers, to reduce electrical loads electrically together with the cable shielding.

hang to be trained.

Preformed components made of elastic polymer that simply fit onto the stripped end of the cable at the junction or to be pushed onto the cable termination are e.g. in GB-PS 1 031 942, 1 113 841 and 1 124 912 of Elastic Stop Nut Corporation of America, GB-PS 1 042 590, 1 142 050 and 1 196 989 of the N.V. Nederlandsche Kabelfabrieken, GB-PS 1,277,217 of Sumitomo Electric Industries, Ltd.; and GB-PS 1,339,502 and 1,348,048 of Amerace

iö Esna Corp. described. A disadvantage of these components is that a large number of component sizes are provided for the many different cable sizes available got to. Disadvantages also arise in accommodating changes in cable size resulting from manufacturing tolerances.

Recently it has also been proposed to use heat shrinkable sleeves for cable connection and termination, as described, for example, in GB-PS 1,475,292 (Raychem Corp.) and GB-PS 1,526,397 (Raychem Ltd.). To regulate the electrical load when using heat-shrinkable sleeves, it has been proposed to incorporate suitable materials into the heat-shrinkable polymer in order to achieve favorable electrical properties. While the use of heat-shrinkable sleeves has generally proven successful, problems can arise from handling errors which result in voids at the connection point or at the termination of the cable.

Another disadvantage that arises in the formation of ■ connections, especially multi-core connections '' the use of pre-formed and heat-shrinkable components has shown is based on the fact that a greater length of the outer cable layers must be cut back than it is desirable to sequentially move a number of tubular components in building the connection along the cable back to the junction, and that the connection tends to have a greater length of cable as strictly necessary or desirable.

The present -Erfinching is based on the idea of building connections and / or terminations using pipe sleeves made of suitable elastic material, such as rubber or elastomer, which have such a degree of elasticity and such dimensions that the sleeves can be stretched to a sufficient extent are to be able to muster them. The sleeves can preferably be rolled up, folded or layered in themselves; and can -on a ready-made j _- &i'er> -

Carrier are held, with the help of which they can be applied ready-made to the | 1O cable by simply winding the cable through the carrier and unrolling the sleeve from the carrier into the intended position on the cable. Or unfolding it. The materials from which the sleeves are manufactured substances can be added to desired electrical resistance or conductance values., Kriechstromschutzwerte to get 'J- etc..

The invention, along with its features and advantages best understood by considering the following description in conjunction with the accompanying drawings. -20 It show:

Fig. 1 shows the embodiment of a cable connection,

constructed in accordance with the present invention; Fig. 2 shows a tubular sleeve made of elastic material, which of

each side is rolled up to its center; 25 is and is held on a carrier that can be provided

will;

it Fig. 3 shows the manner in which the sleeves, as shown in Fig. .;. '· "Provided, but only individually, unrolls from one end can be used in the construction of a cable connection according to FIG.

In Fig. 1 a connection between two cables insulated with an elastomer is shown, each of which has one central conductor 1, elastomeric insulation material 2,

a semiconducting elastic polymer or a lacquer tape ^; Screen 6 and a coiled metal screen 4 · has. Other parts of the cable, not shown in the figure, can have, in a known manner, a PVC or tape bearing layer which extends over the shield 4

and represents an embedding for stiffening wires, and! have an outer PVC jacket. The cable can be one or

be multi-veined. As shown in the figure, the [

Conductor ends of the two cables, for example by Umein- I

and bend fixed in a metal sleeve 5, the Iso- · I

\ lation 2 cut back to expose the conductor ends. ,, j

has been. In a corresponding way, the shields are 6 '' ^:)

and 4 has been cut back by a predetermined amount, >, \ f

and a semiconducting lacquer shield is used to break down the "··." t

electrical load attached to the end of the shield 6. ' ν

It can be seen that for the reduction of electrical load (

provided hose 7 attached to each cable end, \

the tube 7, for example, made of an elastic %

Polymer consists of, for example, silicone carbide, ψ

by a non-linear electrical resistance characteristic

watch. Semiconducting material 8 is for example in -, |

Form of a wrapping of a self-adhesive plastic tape |

or a suitable kit mixture around the metal sleeve 5 f

and in the spaces between the ends of the metal sleeve, } _r

5 and the cut back insulation 2 on each cable *

intended. Furthermore, as shown, two electrical \

insulating layers 9 and 10 are present, each 'with |

an elastic tube, for example made of rubber, gebil- \ _t

det, and finally I is on the outside

-30 of the connection a semiconducting layer 11, which has a \

Hose made of elastic material, the example %

wisely contains carbon. The hose 11 could also be in | the insulating layer 10 can be integrated as a layer component,
and more or less than the two insulation layers 9 and 10 could be provided.

Fig. 2 shows one made of elastic material

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Sleeve 20 which is rolled up from each end and held on a deployable carrier 21, the is provided with weakened areas 22 around a center line ' to easily break the support in half; · the pulled out and from deir. Cables can be cut off, to enable. The sleeve 20 can, if they are in a suitable manner with respect to its final position on the finished Connection is positioned and when the carrier 21 has been removed, unrolled to the intended location. Preferably Instead of being rolled up, the sleeve 20 could be folded like an accordion on the carrier or backwards and in itself

- Be layered forward. Obviously the wearer owns '"21 has a larger diameter at each end than in its center, which not only serves to retain the sleeve 20 "contributes towards their elastic tendency to unroll, but also the unwinding of the wearer relieved about the cable. The rolling of the sleeve 20 onto the carrier 21 can be carried out during manufacture in the factory or at the connection point.

FIG. 3 shows an intermediate stage in the formation of the connection according to FIG. 1. The drawing shows two insulation layers 9 and 10, which are unrolled across the joint from left to right, with each layer, in contrast to the double roller configuration of FIG. 2, has an individually rolled-up hose. ' It's just required Line up the rolled up layers on the cable end in a suitable order, and the connection can be made 'Can be completed in a simple manner by unrolling the tubes over each other.

Due to the use of elastic tubular sleeves build the connection, deviations can in the connection; be added geometry looks, and need less components in stock held for · v / ground to enable the connection of a number of cable sizes!. The inventive method does not require the excessive cutting back of cable shielding layers, etc., which characterize other connection methods, and enables the manufacture of

short, skillful connections with a minimal risk of defects due to a mistake by the person performing the procedure - There is no heating to complete the connection required, reducing the risk of overheating with a resulting destruction of the undamaged cable is excluded.

Although the invention is particularly advantageous in the connection of cables in which excessively long connections with conventional connection methods pose a problem, the invention can also be used for the termination of a cable. , be turned.
_: i .. '---_. The --- invention (is of ^{course- 1} not- on- the-

. ' Use of elastomeric cables is limited, but: can also ^Λ "'for' the connection and / or termination of paper-insulated cables and various other cable constructions. ', and t;''·';'Can be used to create a transition connection between different cable types.

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Claims (1)

SCHIFF v.FÜNER STREHL SCHÜ BIEL-HOPF EBBINGHAUS FINCK MARIAHILFPl.ATZ 2 & 3, MÖNCHEN ΘΟ POSTAL ADDRESS: POSTFACH Θ5Ο16Ο, D-BOOO MÖNCHEN 95 May 27, 1982 PIRELLI GENERAL plc.
DEA-25 736 Improvements in electrical cable connections and / or cable terminations. PATENT CLAIMS ^ J. Method for connecting or terminating an electrical cable, characterized in that the connecting or terminating insulation has one or more insulating layers (9, 10, 20), each of which consists of a preformed tubular sleeve made of elastic insulating material, which is applied in a corresponding manner to the cable connection or the cable end is applied. 2. The method according to claim 1, characterized in that g e k e η η ζ e i c 1 net that the or each preformed tubular sleeve (9, 10, 20) so rolled up, folded or layered in some other form in itself that they over the cable connection or the cable end fits and in place to form the appropriate connection or termination on the cable is unrolled, unfolded or unbraided or stripped. 3. The method according to claim 2, characterized in that g e k e η η - - ' ¹ Z ei ch η et that the or each preformed tubular sleeve ■ '' * (9, 10, 20) is held on an available carrier (21) in the rolled up, folded or otherwise done state, with the help of the carrier (21) *, the tubular sleeve (9, 10, 20) is applied to the cable by,; threading / undening the cable through the carrier (21) and the tubular sleeve Ί - ψ (9, 10, 20) unrolled from the carrier (21) onto the cable, • ri is unfolded or unbraided or stripped off. 4. The method according to any one of the preceding claims, characterized characterized in that the pipe sleeve or pipe sleeves (9, 10, 20) Material components for the intended values of electrical resistance, electrical conductivity, of the leakage current protection, etc. contains or contains. 2ö 5 · Method according to one of the preceding claims, characterized characterized in that the connection or termination insulation is two or more such superimposed Layers on v / eist. t ti ι 6. The method according to any one of the preceding claims for connecting elastomeric cables, characterized in that the elastomeric insulation to The connecting cable is stripped in order to bend the corresponding conductors around one another or in other ways with one another to connect, the corresponding preformed tubular sleeves (9, 10, 20), as mentioned above, on the mutual or be applied to the two cable ends to be connected that the conductor end sections are bent or around one another be connected to each other in any other way, and that the preformed pipe sleeves (9, 10, 20), as mentioned above, for the formation of a reliever acting on each cable end Hose unrolled, unfolded or unbraided or stripped, at least one electrical insulating layer along the entire cable connection • over the relieving hoses and over the one another Connected conductor end portions extends, and at least one semiconductor layer is over this or more insulation layers. 7. Electrical cable connection or electrical cable termination, characterized by the production means of a method according to one of the preceding claims.