DE6604655U - ELECTRICAL CABLE, IN PARTICULAR REMOTE INDICATION CABLES, WITH ONE OR MORE TEST LADDERS FOR MONITORING THE LEAKAGE OF THE CABLE SHEATH - Google Patents

Description

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; SIEMSNS & HALSKB Munich, the ΚΙΜΠ964.

Aktiengesellschaft 'Wittelcbacherrilatz 2

. pa G 4 / 2522-

Electrical cables »inofceaondere Pernneldekabel nit one or more investigators for supervision the tightness of the cable jacket "

The invention relates to an electrical cable, inonesondore Signal cables with a waterproof jacket and an or Several test leaders for monitoring the tightness of the Cable jacket against moisture. Such a test director arrangement has the task of dao sir. penetrate moisture through the cable sheath to indicate in good time that fast A remedy can be provided under unistalls without having to put the cable out of operation.

For the same or a similar purpose, several test

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ladder arrangements become known. Thus test ladder facilities were created in which two to avoid; .i ^": · are iooliert of Induktionaerocheinungen double-wound Sisen- or ■■ ^Vi * copper wires with a Fäoeratoff This elektriuch icolierten with hygroscopic Iuatcrial FrUfdrähte were helically on the core conductor surrounding layer of insulation wrapped or so wound that oie easily embedded in it.! was.

There are also cables with a conductor arrangement who attach the test conductors to wires or metal strips, The un the top Ioolierachicht deo cables he.ruago wrapped will. An eye-capable insulating layer is placed over the test director and above it the lead jacket.

Furthermore iot eo known to provide cables with test leads, at which the auxiliary ladder an acito of lead sheathed through a highly eye-proof, in the dry state iuolating layer | separated oind, while aie other eras against a possibly '|

■ ■ '■ -'"" ■ '■' ■ - "- '" '-''- · ·. ··, .- · '-'' ^r ' ^y :: ar »·. ''. <- · Oil-soaked cable core through an oil-impermeable : ·? '' ·· hl- *

■ - '■ * ■' · "* ■ '" ■ ■ ■''■ j ^: ·'". ·. ■ ^ » f " ^ shift not affected oind. Ea oind also telecommunication cables iiiit ^ kunot- '-"; Fabric-insulated cores known in which the protective conductor is provided with a Kunotatofüberzug which is made permeable for the passage of moisture.

The mode of operation of the known facilities is based on it ^

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that the originally high insulation resistance between a protective conductor and the metallic cable sheath or * ■ between the protective conductors gradually absent when moisture enters, without ever a certain insulation value to accept. This also makes the fault location relatively complex. Also by having the protective conductor surrounds with openwork insulating materials, the Conditions for error detection not improved sufficiently.

The object on which the invention is based now consists in inserting the test conductors into an electrical cable in

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build that they can locate faults with simple means and with great accuracy. With the electric one

• Cable according to the invention, the test conductors are provided with water-soluble insulation. Now occurs about a job- " Qualification point for the otherwise watertight cable jacket Feuchtig -''-, ί

* '. ness in the cord, it also reaches the water- soluble 'J, £ ") ■, Liehe insulation between the bare test leads that ^are: \ r ^

L. , ^ finally touch. At the point of the fault, there is ^ alzo.J "U} i: '"'','.;,'' , · "'■' - not a decrease in the insulation resistance between the - ^ ■ '■". Test leads, but a drop in resistance to the Hull value. This enables fault location with the simplest means. The test conductors can be arranged in a manner known per se directly under the cable jacket, in the cable core or in the central axis of the cable. she

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can also be helical or parallel to the Cable speedometer can be installed. The test directors will be advantageous .. with each other twisted. The test director can also be made flat and through a waouerlöüliche Keep insulation separate from each other. Leg penetration of You can then touch the two flat conductors. ·

So that the test director's contact with. great security takes place, eü can advantageous coin to the test director mechanically To arrange effective, elastic means. Seiopielßv / eioo you can find Kunatctoff threads with feather properties and the test manager The helical lines that the test director press against each other. · · · ■

The tape-shaped test conductors can advantageously with. relatively large cross-section formed without causing thickening spots on the cable oil. Dieoe test directors can then also work for others. Purposes exploited · ·· ._. 'will. Beiopielsweioe can aie simultaneously for the ;; "-" - · "schute against FremdbeeinfluoGung exploit a _measure; /.r-;·" just in kunstotoffumiaantelten cables without metalliache ·. .-. f '·' shell can be of importance. You can use the ribbon-shaped test leads but also alo shield within the Kabeloeele

use.

; 3ei the cable according to the invention is caused by the penetration

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A relatively strong effect of moisture very early on, namely a spontaneous Y / resistance change between, indicated to the investigators. If you use metal sheathed Cables have hygroscopic insulating materials that initially cause a change in temperature change before they are released from the water then you can reduce this Y / resistance to Take advantage of Kelixwpg from excessive moisture in the cable. In order to there may be an advance warning for the expected

■ "',. Report of a total course completion between the study directors

j ■ _t at the point of failure. Because of the total short circuit, the fault location can then be carried out with a fairly high degree of accuracy, e.g. be done by means of a simple resistance measurement. In the case of plastic-sheathed cables, however, it is more advantageous for the mutual. Insulate the test conductors if possible, not hygro ··· - .... ckopicche, but use water-soluble substances.

f - ^ The invention is explained in more detail using an exemplary embodiment

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\ . "In Fig.'i a telecommunication cable is shown« which consists of the '/ , 1- cable core 1, the wrapping 2 and the cable sheath 3-'"^ Between the cable core and the cable sheath 3 are the stranded test conductors 4 with water-soluble insulation arranged. The test conductors can advantageously be twisted in a helical manner around the cable core.

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2 Piguren

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JLr. der Pig.2 Dir.d the test director i? and β "band-shaped auc- |

formed -and by the horizontal insulation 7 of-]

separated from each other. When loosening the insulation touch 7:

oicii the two. Head 5 and G and result in go a short->

cchiuss. Uni the contact of the two test directors with safety \

cause ur. dio test leader z.3. Kunot \

fabric ad en not be wrapped with feather properties,. |

which the test conductors press together as soon as the separated I

chei: de insulation 7 gives the opportunity to do so. Pur the Anj

each press of the test conductors but can also isechani- \ see tension in Kabelauxbau exploited v / ground.

Claims (4)

• · «ft» * · · I * J1 * * PA 9/435/126 '-7- «/N.urtrüche • 1. Electrical cable, especially telecommunication cable mi · *; a waterproof jacket and one or more Test conductors for monitoring the tightness of the ι ? Zabelaantelü against! Moisture, characterized that the test ladder with a water-soluble Iso-EXeruiig vsriJooiCj 2. Elektriuchea cable according to Anopruch 1 imter use of zv / ei test ladders j characterized in that the ladder twisted together oind. 3 Slektriücheu cable according to Claim 1, characterized in that that the ladder is flat and curch. a water soluble one Isolation separated from each other oind. 4. Electrical cable according to one of the preceding claims, characterized in that the test director with relatively large. Cross-section in particular formed in the form of a band and at the same time used for protection against the influence of prer.