SK97598A3 - Wholly shielded power cable - Google Patents

Abstract

Generally shielded power cable is useable also as an installation for voltage systems up to 0.6/1 kV. The cable consists of the cable sleeve (7) and of at least one vein (3), which is made by conductive core (1) and isolation (2) of the vein (3). Between them there can be glass-mica layer (8), whilst in alternative solutions there is between the cable sleeve (7) and at least one vein (3) fixation and separation stripe (4) placed. Under the cable sleeve (7) there is in the form of continuous conductive layer the sealing cover (11) placed, consisting of longitudinally undulated metal layer (5) and spirally twisted metal layer (6), whilst the edges of each metal layer (5, 6) are overlapped and create covering (12).

Description

Overall shielded power cable

Technical field

The invention relates to an overall shielded power cable which can also be used as an installation for voltage systems up to 0.6 / 1 kV.

BACKGROUND OF THE INVENTION

Hitherto known, total shielded power installation cables have a shielding package made by wrapping a metallic conductive tape, supplemented with bare conductors wrapped or embedded under the tape.

The other solution is based on a longitudinally embedded metal strip, encircling the cable's braided core, circumferentially closed radially.

The disadvantage of these solutions is the insufficient shielding of the inner vein of the cable in the cable core, especially in the mid and high frequency ranges. This causes, in particular, an increase in the level of wide frequency spectrum interfering signals emanating from the cable core, inducing into the line, into devices connected to the electrical lines.

This effect is manifested precisely by influencing the operation, inter alia, computer technology and in radio transmissions, where the requirement of electromagnetic compatibility is high.

SUMMARY OF THE INVENTION

Him. Accordingly, the overall shielded power cable according to the invention, consisting of a cable sheath and at least one conductor consisting of a conductive core and a conductor insulation, between which there may be a mucosal layer, alleviates these disadvantages. In alternative solutions, a fixation and separation tape is also provided between the cable sheath and the at least one core. It is an object of the present invention to provide a shielding sheath, which consists of a longitudinally undulating metal layer and a helically wound metal layer, in the form of a continuous conductive layer, under the cable sheath, the edges of each metal layer overlapping to form an overlap.

In a preferred embodiment, a padding layer is provided between the at least one vein and the shielding sheath on the fixation and separation tape. Between the cable sheath and the shielding sheath, a fastening and filling tape is placed on the a / abbo under the fixation and separation tape.

The advantage of the invention is the high tightness of the continuous conductive layer of the shielding sheath, which is also sufficient from the point of view of the high-frequency technique with a minimum intrinsic inductance which, by its final thickness, provides shielding in terms of the depth of interference signals at the lower frequencies.

Another advantage of the solution is its ability to prevent flame propagation over its own cable.

The generally shielded power cable thus arranged also has a high attenuation factor by shielding the interfering signals.

BRIEF DESCRIPTION OF THE DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS The invention is explained in more detail with reference to the drawings, in which: FIG. 1 is a longitudinal and cross-sectional view of a generally shielded power single core cable, a variant when a longitudinally corrugated metal layer is placed under the helically wound metal layer.

Figure 2 shows a solution according to the invention using a multi-core cable.

Figure 3 shows a multicore cable solution where a helically wound metal layer is placed under the longitudinally undulating metal layer.

DETAILED DESCRIPTION OF THE INVENTION

Example 1

In the electrical installation, a single-core, totally shielded power cable according to the invention was used.

The conductive core 1 of the cable is provided with a continuous insulation layer 2 of the core 3, on the core 3 a sheathing 11 is placed so that the core 3 is wrapped around its entire circumference with a longitudinally corrugated / metal layer 5 with slight corrugation perpendicular to the longitudinal axis. The overlap 12ff of the longitudinally corrugated metal layer 5 is 5% of the circumference length.

The helically wound metal layer 6 of the shielding sheath 11 is wound around the circumference of the longitudinally undulating metal layer 5 with an overlap 12 of 20% of the individual wraps.

The cable structure is closed by the cable sheath 7, as shown in Figure 1.

Example 2

The conductor cores 1, insulated by a continuous layer of insulation 2 form a core 3, are laminated into the core of the cable 13, the outer surface of which is wrapped with a fixing and separation tape 4. On it there is a continuous application of a filling layer 10, which is wrapped around the entire circumference with a shielding cover 11. This consists of a lower longitudinally undulating metal layer 5 with an overlap of 10% and an upper helically wound metal layer 6 with overlapping 10% of the individual windings. The shielding sheath 11 is closed by the sheath of the cable 7 as shown in Figure 2.

-3Example 3

The multicore, totally shielded power cable is composed of conductive cores 1, each of which is provided with a winding layer 8 and insulated with a continuous layer of insulation 2. Thus, a cable core 3 is formed which is coiled into the cable core 13 and further wrapped with a fixation and filler There is a screen cable Γ1 formed in this case, first formed by a spiral-wound metal layer 6 with an overlap 12 of 20% threads, followed by a longitudinally undulating metal layer 5, with an overlap of 3%.

Under the sheath of the cable 7, which closes the entire cable structure, there is still wound the fixing and filling tape 9, as can be seen from Figure 3.

Industrial usability

The solution according to the invention has particular application in the areas of impulse control environments, in environments where impulse control interference occurs, in the switching voltages and wherever the requirement for electromagnetic compatibility is increasing.

Claims (3)

PATENT CLAIMS 1. Totally shielded power cable, also usable as an installation for voltage systems up to 0,6 / lkV, consisting of a cable sheath (7) and at least one core (3), consisting of a conductive core (1) and core insulation (2) (3), between which may be a mica layer (8), wherein in alternative solutions, between the cable sheath (7) and the at least one vein (3) there is also a fixing and separation tape (4) characterized in that underneath the cable sheath (7) a shielding sheath (11) is provided in the form of a continuous conductive layer, consisting of a longitudinally undulating metal layer (5) and a helically wound metal layer (6), the edges of each metal layer (5,6) overlapping to form an overlap (12). An overall shielded power cable according to claim 1, characterized in that a filler layer (10) is provided between the at least one conductor (3) and the shielding sleeve (11) on the fixing and separating tape (4). . Totally shielded power cable according to claim 1, characterized in that a fixing and filling tape (9) is arranged between and between the cable sheath (7) and the shielding sheath (11) on and / or below the fixing and separating tape (4).