DE3222573A1 - Earthing cable or suchlike variable-location apparatus - Google Patents

Abstract

The invention relates to an earthing cable or suchlike variable- location appartus (10) having a flexible, round conductor cable (1) consisting of thin copper wires (4) in a flexible plastic sleeve (2) and having integral fittings (3) at the ends. The invention achieves the object of constructing said cable, while maintaining high flexibility and conductivity, such that corrosion is minimised and the life is increased while ensuring reliable operation. To this end, a special corrosion protection coating (5, 6) of the copper wires (4), a cable structure which takes into account the necessary flexibility and reduces the surface which is at risk of corrosion, and a clear, flexible, sealed sleeve (2) of the cable (1) are provided. <IMAGE>

Description

Earthing rope or similar portable device

The invention relates to a grounding cable or the like which is movable Device for earthing and / or short-circuiting electrical supply systems such as generators, Transformers, switchgear or the like, according to the preamble of claim 1.

The perforations to be made on such devices or their structure are in DIN 57683 from June 1979 in accordance with VDE regulation 0683 part 1 / 6.79 in connection with DIN 46440 from July 1971 specified and explained. Such a single pole Grounding cords and other such devices are also included in Promotional Publication No. 6 "Safety Devices . . "of the company Karl Pfisterer, Stuttgart-Untertürkheim, in particular their website 10 can be found. All previously known earthing ropes or others with one Short-circuit and / or earthing devices equipped with copper stranded cables show despite the thermoplastic plastic sheath surrounding the rope has a relatively high level Susceptibility to corrosion of their copper wires.

This is due to the inevitable penetration of humidity, possibly in connection with aggressive pollutants in the air traced back under the sheath or between the wires, on the surface of these Media, mostly with the formation of copper oxide, have a corrosive effect. this leads to but in a relatively short time to the rapid wear of the stranded wires, which through their mechanical and thermal stresses as a result of repeated Bends and current loads on the rope is increased.

The conductor wires of the ropes become narrow-minded and brittle over time, so that - often unnoticed - the large one, which is absolutely necessary for security reasons Conductor cross-section of the rope no longer or only to a significant extent Part remains. However, such grounding cords or devices are in this case unusable because they no longer guarantee the necessary leakage security. Therefore one has gone over to the stranded wires with a copper braid inside the transparent cover to enclose, which a better mechanical cohesion the very thin (0.1 mm) copper wires of the rope and thus their rapid Is to prevent destruction, while the transparency of the shell is a visual inspection, whether it is still usable or already through advanced corrosion or other Effects is largely destroyed, should allow. Yet it is not yet succeeded in significantly increasing the service life of such earthing ropes and their safety raise.

The invention is based on the object of providing an earthing cable or

to design a device of this type equipped with a conductor cable in such a way that that while maintaining the high flexibility and electrical conductivity of the rope prevents or prevents the corrosion of the copper wires that make up it largely reduced, and the serviceable life of such a rope is significantly increased with repeated safe use of the same. This task is achieved with the invention characterized in claim 1.

Advantageous further education of the earth connection are with the subclaims 2 to 5 indicated, of which claim 2 the preferred thickness dimensions of the individual Wires of the conductor cable relates to claim 3 on the selection of materials for the Corrosion protection coating on the copper wires or the flexible ones that tightly surround the rope Envelope is directed, while the Claim 4 to a special Execution of the anti-corrosion coating and claim 5 for additives to the material refer to the cover to increase its transparency.

The advantages of the invention lie in the sum total of the special units this grounding rope or the like caused increased safety and durability same. What is essential for this is that it is thicker than usual because it is used up to now The lead wires of the rope minimized the corrosion-prone surface of the rope, the Corrosion protection coating provided for the entire conductor cable or each individual one its wires and the increased crystal-clear transparency of the tightly enclosing it Covering.

There is no need to arrange a braided copper hose inside this sheath, because the copper wires of the conductor cable are thicker and therefore less susceptible to breakage than before and are corrosive. In addition, the conductor cable is flexible enclosed in a crystal-clear shell, which protects it against mechanical damage, the ingress of humidity is largely prevented and at the same time permanent visual Permits state perception of the rope.

The invention is illustrated below with the aid of one in the drawing Embodiment explained in more detail. The drawing shows: FIG. 1 a single pole Earthing rope with end fittings, in a perspective view Fig. 2 a piece of the Earthing rope of the figure, with the stranding legs and outer sheath partially removed, and FIG. 3 shows a cross section through the complete section of that shown in FIG Earthing cable piece.

The portable device 10 shown in the form of a grounding cable comprises a conductor cable 1 made of copper wires and equipped with fittings 3 at the end a flexible sheath 2. The conductor 1 consists of several around a core strand 9 split rope legs 8, each of which from a variety is composed of thin copper wires 4. To each of them, preferably also between the wires 4, a corrosion protection coating 5 or

arranged so that no humidity or other from the environment up to under the flexible sheath 2 penetrating media on the surface of the corrosion-sensitive Wires 4 can act. An outer corrosion protection layer offers additional protection 7 around each of the rope legs 8, which as a stranded connection the conductor rope 1 of the grounding rope or safety device 10 for grounding or short-circuiting electrical supply systems form.

What is essential here, apart from the anti-corrosion coating 5 of the wires 4 or that arranged between and / or around the stranding legs 8 Corrosion protection layers 6 and 7 the special construction of the round conductor cable from a smaller number of thicker copper wires 4 than has been customary up to now with a diameter between 0.12 and 0.25 mm, preferably between 0.16 and 0.21 mm. This has the effect that the conductor cable has the same overall cross-section has the required flexibility as well as minimizing the surface corrosion-promoting reactions of the conductor cross-section considerably less attack surface than before.

It is also essential that the conductor 1 is directly from the crystal clear flexible and tight sheath 2 is enclosed.

This consists of a soft compound based on polyvinyl chloride, which the transparency of the shell brightening up to the glass clarity from stabilizers organic compounds of metals such as barium, cadmium, stronzium or tin are added are. To form the shell, a product under the trade name 1iTrosiplastRI1 Compound available on the market from Dynamit Nobel AG, Troisdorf as good proved suitable.

The openness of the corrosion protection coating is of particular importance 5 or the intermediate and / or external corrosion protection layers 6 and 7, respectively from a Neuti'alö based on a solution of a specially treated, acidic and alkali-free mineral oil or such a mixture of mineral oils in a low-boiling point Liquid e.g. alcohol or the like. It was found that one under the designation "UstanolR" by the company Klever, Ahan, brought onto the market for corrosion protection agent can be used for the stated purpose, with so manufactured and corrosion-protected Long-term tests of various types carried out on lines whose long-term corrosion resistance and wear resistance and thus reliable safety.

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Claims (5)

Claims: Earthing rope or similar portable device for Grounding and / or short-circuiting electrical: rather supply systems such as generators, transformers, Switchgear or the like, consisting of a composed of many thin copper wires (4), flexible round conductor cable (1j in a gapless flexible sheath (2) from a transparent plastic, e.g. PVC, and with ready-made fittings and / or Then rush to both ends of the return rope (1), g e k e n n n z e i c h n e t d u r c h a corrosion protection coating (5) of the copper wires (4) of the conductor cable (1), one that takes into account both the required flexibility of the conductor as well as by minimizing the surface of the conductor cross-section, which promote corrosion Conductor construction that offers little contact surface for reactions, and a crystal-clear, flexible, dense cover (2). 2. Earthing rope according to claim 1, d a d u r c h g e k e n n -z e i c h n e t that the conductor cable (1) with the same overall conductor cross-section from a smaller Number of thicker copper wires (4) with a diameter between 0.12 and 0.25 mm, preferably between 0.16 and 0.21 mm. 3. Earthing rope according to claim 1 or 2, d a d u r c h g e k e n n z e i c h n e t that the copper wires (4) with a corrosion protection coating (5) a neutral oil based on mineral oil in a low-boiling solution, e.g. in alcohol, are coated, and the flexible grommet (2) from one with their transparency-optimizing stabilizer system mixed with soft polyvinyl chloride compound is trained. 4. Earthing rope according to claim 1 or 2, d a d u r c h g e k e n n z E i c h n e t that each of the copper wires (4) for itself circumferentially with the anti-corrosion coating (5) is coated. 5. Earthing rope according to one of claims 2 to 3, d a d u r c h g e it is not indicated that the soft compound of the flexible casing (2) is transparent Stabilizers that lighten up to crystal clarity, consisting of organic compounds of metals such as barium, cadmium, stronzium or tin are added.