FI85431B - Conductor construction for an electrical distribution and/or information link - Google Patents

Description

1 85431

The present invention relates to a conductor structure for an electricity distribution and / or information connection, which conductor structure is intended primarily for installation in the ground.

Conventional ground-mounted conductor structures are cables that are installed on a sand base suitable for a cable trench and covered with separate guard rails and sand before the cable trench is finally covered. Such a method of installing cables on the ground requires a relatively large amount of earthmoving work, which always has to be done again in connection with measures to the cable, such as repairs or replacement work. This 15 means quite frequently tearing open streets, roads and pavements. In addition, underground cables installed in this way are relatively susceptible to damage caused by excavators, for example, because the cables are hardly able to slide axially due to traction, resulting in excavation crushing most often causing a cable break that requires two cable joints to repair.

In addition, in conventional cable technology, power-25 distribution cables and information cables are installed separately and often even in separate excavations, which incurs significant additional costs compared to being able to be installed simultaneously or even together. One such possibility, albeit relatively limited in its use, is provided by a composite cable in which a control cable, telecommunication cable, optical cable or the like is connected to the high-current cable, through which commands, data transmission, etc. necessary for high-power line control can be transmitted. damage, excavation work, 2 85431 wire interchangeability, preparation for the future, difficulty in repair, etc.

It is therefore an object of the present invention to provide a wiring structure by means of which electricity distribution and information connections can be efficiently installed by means of a single common wiring structure. This conduit structure according to the invention is characterized in that it comprises a tubular structure made of strong, weather- and frost-resistant plastic with at least two separated compartments, of which at least one conductor with only sufficient operational insulation and one exposed conductor are connected separately. to provide a low voltage distribution line while a telecommunication line conductor, a telecommunication or optical cable or a light line is arranged in one other compartment. Such a pipe structure according to the invention can consist of a pipe in which an axial partition wall is arranged or of several pipes, either parallel or nested, in which case at least one conductor is intended to be fitted to each pipe. In this way, the conductors for electricity distribution and the information for use can be separated from one another, but nevertheless installed at the same time in the same cable excavation, which in the case of such a conductor structure can be formed, for example, by so-called plowing.

A significant advantage of the invention is that by using a properly dimensioned plastic tube surrounding the conductors, the insulation and shielding of the conductors themselves can be substantially reduced and limited almost exclusively to a single-layer sheath, which in the case of a power distribution conductor acts as operational insulation.

A significant advantage of the conductor structure according to the invention is that the plastic tube structure included therein allows a simple replacement of the conductors in the tube, either in the event of damage or if it is desired, for example, to increase the capacity of the electricity distribution connection. Similarly, it is easy to increase the capacity of information wires by either drawing additional wires into the pipe or by replacing the previous wire with a larger information transmission capacity. Such information conductors may be, for example, telecommunication cables, optical cables, pneumatic cables or the like.

The easy removal of the conductors from the surrounding pipe also allows the conductors to be used in new installations or at least makes them easy to scrap and the scrap value high, as they have only a simple insulation structure.

The conduit structure of the invention, hereinafter also referred to as a composite pipeline, is economical in terms of materials, manufacturing, installation, repair, maintenance and modification costs. Such a combined pipeline provides very low cost data, automation, control, protection and other information transmission paths, which can be used, for example, by power plants for the remote use of their electricity distribution network.

20 Due to the loose placement of the conductors inside the pipe structure and on the other hand the possibility of generating additional conductor length in the conductor structure by means of suitable accessories, the conductor structure according to the invention is almost as susceptible to damage by conventional underground cables. In most cases, the damage caused by the excavator is limited to repairing the plastic pipe structure and repairing the wires themselves is not necessary. Also in cases where the conductors themselves have to be repaired, only a one-to-30 conductor extension has to be made, because the additional conductor length required for making the extension in both the telecommunication and energy conductors is available from the conductor accumulator connected to the conductor structure.

The tubular structure of the conductor structure according to the invention is most preferably uniform over the entire length of the electricity distribution and / or information connection and is thus fed, for example, from a suitable coil or coil. Thus, the installation of the guide structure according to the invention can be carried out efficiently by so-called plowing, in which a sufficiently deep incision is made in the ground into which the pipe is lowered, after which the plowing mark is covered. Thus, the excavation of the actual cable trenches is avoided.

The lead structure according to the invention will now be described in more detail with reference to the accompanying drawing, in which Figure 1 shows a cross-section of one exemplary embodiment of a lead structure according to the invention and Figure 2 shows a cross-section of another exemplary embodiment of a lead structure according to the invention. The conduit structure shown in Fig. 1 comprises a pipe structure 1 consisting of a pipe 7 and an axial partition 8 arranged therein for dividing the interior of the pipe into two compartments 2 and 3. A telecommunication or other similar conduit 6 is shown arranged in the compartment. high-power line conductors or high-current cables 5, which in principle only require sufficient electrical insulation without other protective layers.

Figure 2 shows another embodiment 10 of a composite pipeline according to the invention with one outer tube or main tube 17 and two inner tubes 18 and 19, of which the tube 18 is attached to its outer surface on the inner surface of the main tube 17 while the tube 19 is detached inside the main tube 17. 12. In this way, the composite pipeline shown in Figure 2 comprises three compartments, a compartment 12 inside the main pipe 17, a compartment 14 in the main pipe 18 and a compartment 13 in the detached pipe 19. In the embodiment of Figure 2, the conductors of the compartment 3 of Figure 1 are arranged in the compartment 12. corresponding high-current lines 15, a telecommunication or other similar line 35 16 is placed in the compartment 14 as well as in the compartment 13.

5,85431

As can be seen from Figures 1 and 2, the partition wall 8 of the inner tubes 18 and 19 as well as the tube structure 1 of Figure 1 is thinner in material thickness than the tube 7 of Figure 1 or the main tube 17 of Figure 2. This can be done because the outer tube 7 or 17 already provides significant mechanical protection. for the conductors inside the pipe. Of course, it would be possible that the situation would be the other way around or that the wall thicknesses of all the pipes would be the same. However, this makes no sense other than in space-10, where the tubular structure comprises two or more tubes connected to each other by their outer surfaces.

The plastic pipe parts of the tubular structure of the composite pipeline according to the invention are made of strong weather- and frost-resistant plastic, for example HDPE plastic, and likewise strong, weather- and frost-resistant plastic, for example HDPE or PEX plastic, has been used to insulate the conductors.

When manufacturing the conductor structure according to the invention, the conductors can be placed in the pipe structure already at the factory or only in connection with the installation, or a combination of these exchange conditions is also possible. Thus, the conductors can be, or at least some of them can be placed in the pipe already at the pipe manufacturing stage, or they can be drawn into the pipe already at the factory or also during installation. The conductors can also be drawn into the pipe by "blowing", which means using compressed air to draw the conductors to the conductors. The tightness and pressure resistance of the pipes used offer the possibility of such an installation method. Another option is to place a traction rope in the tube during its manufacture to facilitate subsequent traction of the conductors. The conductors can also be inserted into the pipe by providing a longitudinally split incision in the pipe, from which the conductors can be inserted into the pipe and then gluing the incision closed. Such an incision can be made either at the factory or, why not, in connection with the lowering of the conductor structure. As an alternative to the stone polishing of the pipe, it would be conceivable for the pipe to be formed from a strip or from one or more plastic gutters, in which case the desired conductors are fitted inside them before the joint is joined together. With such an installation-5, for example, the structure of Fig. 1 as well as the structure of Fig. 2, in particular with regard to the loose pipe 19, could well be considered. However, all such installation methods result in a conductor structure of the type shown in Figures 1 and 2 with a strong and uniform plastic tube surrounding the conductors, with partitions or additional tubes inside to create the necessary compartments. In order to make the conduit structure as tight as possible and to minimize the number of extensions required, it is advantageous that the tubular structure is produced, in principle, continuously in its longitudinal direction.

The conductor structure according to the invention has been described above on the basis of only some exemplary embodiments and it is understood that several changes can be made to it, in particular the number of compartments and the type of conductors to be installed in the compartments without departing from the scope of the appended claims.

Claims (9)

A cable structure for an electricity distribution or information connection, which cable structure is intended primarily for installation in the ground, characterized in that it comprises a tubular structure (1; 10) of strong, weather- and frost-resistant plastic with at least two separate compartments (2, 3; 12, 13, 14), in which at least one conductor with only sufficiently spaced operational isolation and one bare conductor are provided separately to provide a low voltage distribution line, while in one of the other compartments telecommunication line conductors, telecommunication or optical cable or light cable are arranged . Conductor structure according to Claim 1, characterized in that the tubular structure (1) consists of a tube (7) in which an axially curved partition wall (8) is arranged. Conductor structure according to Claim 2, characterized in that the partition wall (8) is thinner in material thickness than the wall of the pipe (7). Conductor structure according to Claim 1, characterized in that the tubular structure (10) consists of two or more tubes (17, 18, 19). Conductor structure according to Claim 3, characterized in that the pipes are connected to one another on their outer surfaces. Conduit structure according to Claim 3, characterized in that one of the tubes is an outer tube (17) with one or more inner tubes 30 (18, 19) inside. Conductor structure according to Claim 5, characterized in that at least one inner tube (18) is connected to the inner surface of the outer tube (17). 7 85431 Conductor structures according to Claim 6 or 7, characterized in that the wall thickness of the inner tube (18, 19) is less than the wall thickness of the outer tube (17). 9 * 5431