DE1028644B - Movable, multi-core, rubber-insulated low-voltage power line for mining operations with conductive rubber-covered auxiliary conductors in the interstices of the main cores - Google Patents

Description

The invention relates to movable, multi-core, rubber-insulated low-voltage power lines for mining operations with conductive rubber-covered auxiliary ladders in the gusset spaces, especially for cutting machines. Lines of this type are particularly noteworthy as a result of the rough operation made high demands both in electrical and mechanical terms. The lines will For these reasons, λ-linked with special monitoring devices (protective relays), which are activated when If there is a fault in the protective jacket or in the insulation, switch off the line immediately, before sparks can occur. The conductive rubber-sheathed auxiliary conductors lying in the interstices can depending on the prevailing conditions and the respective monitoring equipment used as special control cores and / or as additional line wires to increase the conductivity of the Conductive rubber layers to which the monitoring devices are connected. Furthermore can the interstices are used to accommodate earth and protective conductors.

Up to now, it has been customary in such lines to design the conductive rubber layer overlying the twisted main cores and auxiliary cores in such a way that it completely fills the remaining interstices. However, this has the consequence that the position of the main wires is essentially fixed and the wires can only move in the longitudinal direction when the line is bent and twisted. This effect is further exacerbated if a profile core (Cracore core) made of rubber or the like is arranged in the usual way in the middle of the twisted line and the main cores are stored in helical grooves in the core. If the cable is now excessively stressed in terms of tension and torsion, this results in a twist change, ie an extension or shortening of the wires . Since, as a result of the aforementioned fixation of the veins, it is not possible to move them sideways, the conductors of the veins are overstrained, namely permanent compression or permanent elongation, a phenomenon known in specialist circles as "corkscrew formation".

The invention relates to movable, multi-core, rubber-insulated .NHederspannungs power lines for mining operations with conductive rubber-coated auxiliary wire lying in the gusset spaces of the main veins learn and one arranged directly above the twisted wires and auxiliary lines semiconducting layer through which all conductive rubber layers the auxiliary conductor and, if necessary, the conductive rubber layers over the main cores Movable, multi-core, rubber-insulated low-voltage power line

for mining operations in the

Gusset spaces of the main veins lying conductive rubber-sheathed auxiliary conductors

Applicant:

Siemens-Sdmckertwerke

Corporation,

Berlin and Erlangen,

Erlangen, Werner-von-Siemens-Str. 50

Walter Holtz, Berlin-Siemensstadt,
has been named as the inventor

be brought into conductive connection with each other. In such a power line there is Invention is that directly over the twisted wires and the conductive rubber-sheathed auxiliary lines Leaving the remaining outer gusset spaces free, a conductive textile tape winding and above it a closed conductive rubber layer, preferably applied by spraying are.

Three exemplary embodiments of the invention are shown in the drawing.

The line according to FIG. 1 consists of four around a profile core 10 made of a rubber-like insulating material twisted wires, three of which form the main wires and one wire the protective or earth conductor. Every The core consists of the stranded conductor 11 and the rubber insulation 12. In the remaining interstices four pairs of auxiliary conductors are arranged, each consisting of a conductor 13 encased with conductive rubber and one insulated conductor 14 exist. Each auxiliary conductor pair is covered with conductive rubber 15. According to the invention is about the line core constructed in this way is an overlapped winding 16 made of a conductive textile tape and a closed layer 17 of conductive rubber applied by spraying is arranged above it.

Claims (2)

over follows an overlapped winding 18 made of a non-conductive textile tape and over it the outer mechanically resistant protective sheath 19 made of a rubber-like material, e.g. B. of polyvinyl chloride, polymerized chlorobutadiene or the like. According to the embodiment according to FIG. The earth or protective conductor is formed in this embodiment by two sub-conductors 22 which are individually wrapped with the insulation 23 and the conductive rubber layer 24 and arranged in two interstices. In the third interstice there are two conductive rubber-sheathed conductors 25 which are twisted together and covered with the common conductive rubber layer 26. The line shown in FIG. 3 consists, with the omission of a centrally located pron core, of three main cores which are twisted with one another and which, in accordance with FIG. 2, are individually encased with a conductive rubber layer 24. The ground or protective conductor is divided into three sub-conductors 27 with conductive rubber sheath 28, which are located in the three interstices. The invention is not restricted to the specified embodiments. For example, in the embodiment according to FIG. 1, the main cores and also the ground cores can be individually wrapped with a conductive rubber layer. The invention can also be used analogously for flat lines with two main cores. A further conductive layer (shielding layer) can be arranged over the conductive rubber layer formed according to the invention with the addition of a rubber-like insulating layer, over which the outer jacket then follows. P.V T E N T Λ N S P R 0 C H E: 1. Movable, multi-core, rubber-insulated low-voltage power line for mining operations with in the interstices of the Conductive rubber-sheathed auxiliary conductors lying on the main veins and one directly above the one with each other arranged twisted wires and auxiliary lines semiconducting layer through which all conductive rubber layers of the auxiliary conductor and possibly also the conductive rubber layers lying over the main cores are brought into conductive connection with one another, characterized in that directly over the twisted wires and the conductive rubber-sheathed auxiliary lines under exposure of the remaining outer gusset spaces a conductive textile tape winding and over it a closed one, preferably by spraying applied conductive rubber layer are arranged. 2. Power line according to claim 1, characterized characterized in that over the closed conductive rubber layer a non-conductive textile ' tape winding and above a rubber-like insulating layer or the outer rubber-like protective sheath are arranged. Considered publications:
German Patent No. 466 572;
British Patent No. 681,899. 1 sheet of drawings © & 09 507/274 4.58