FI69538B - FOERHINDRINGSANORDNING FOER LJUSBAOGESKADOR ELLER NAOGON ANNANMOTSVARANDE UPPGIFT SKOETANDE LEDNINGSBYGGNADSKOMPONENT - Google Patents

Description

1 69538

Arc damage prevention device or other line construction component performing a similar function

The invention relates to an arc damage prevention device or other conductor component for a similar function for insulated open conductors comprising a conductor and a thin insulator surrounding it, comprising a body extended at at least one end and means for securing the body around at least a partially uninsulated part of the conductor.

10 Open conductors coated with a thin layer of insulating material and overhead conductor lines formed therefrom and the reasons for their use are described in FI patent publications 53 373 and 53 526. Although such conductors with a thin layer of insulating material achieve several advantages, they also have some problems that do not occur with bare open conductor structures. One such is that, for example, arcs generated by climatic overvoltages between phase conductors cannot pass along the conductors but remain burned in place at their ignition point 20, i.e. generally where the insulation is damaged or removed for some reason, e.g. In this case, the conductor burns very quickly under the influence of the arc. To prevent this phenomenon, insulated overhead lines are equipped with arc damage prevention devices 25 with a massive part to which the melting effect of the arc is directed.

However, when installing conventional arc damage devices or other components for a similar purpose, it is often the case that too long of the conductor insulation 30 is removed, leaving the uninsulated conductor visible outside the device. It has now been found that the arc ignites between this bare conductor part and e.g. a component of an adjacent phase, whereby the conductor melts very quickly and the intended effect is not achieved by the arc damage prevention device.

This problem is completely eliminated by the structure of the arc damage prevention device or a similar cable building component according to the invention. This arc protection device according to the invention or a cable-building component performing a similar function is characterized in that extensions are formed at the ends of the mounting groove of the conductor in the body, which are concentric with the conductor when the conductor is mounted.

In the following, the structural solution according to the invention will be described in more detail by means of exemplary embodiments with reference to the accompanying drawing, in which Fig. 1 shows an arc damage prevention device according to the invention, Fig. 2 Fig. 5 shows a top view and a partial section of the hanger of Fig. 1, Fig. 5 shows an arc damage prevention device acting as an angle holder according to the invention, Fig. 6 shows an arc damage prevention device acting as a terminal holder 20 according to the invention, Fig. 7 shows an arc damage prevention device according to the invention. blocking device along line BB in Figure 7.

Figure 1 shows an arc damaging device according to the invention, which is intended for use as a hanger for a straight line section. This hanger comprises a trough-shaped body 1, in which suspension loops 2 are formed in one piece and expansions 3 of the end portions allow to act as an arc damage prevention device 3. A conductor 4 coated with a thin insulator 5 is fixed to the trough of the body 1 by U-shaped bolts 7 against the stripped part 6 of the conductor. As can be seen in particular from Figures 1 and 4, the insulation 5 of the conductor 4 is removed 35 with respect to the conductor only in contact with the body 1 and cylindrical extensions 9 outside the extensions 3, which would create a risk of the arc igniting between this non-insulated part and e.g. a structural part of an adjacent phase.

Figures 2 and 3 show a substantially rotational shape of the body end extensions 3. Similarly, Fig. 3 shows a circular cross-section of the extension 9 of the cable mounting groove, whereby the conductor 4 is located concentrically with the extension 10.

Figures 5 and 6 show, respectively, arc protection devices for use as a cable angle holder and an end holder, which, using the reference numerals of Figures 1-4, consist of a trough-shaped body 1, a suspension loop 2 connected thereto, U-shaped bolts 7 for locking the conductor 4 and in the embodiments of Figures 1 and 6, in the embodiments of Figures 5 and 6, cylindrical extensions 9 are formed in the mounting grooves of the conductor 4.

Figures 7 and 8 show an arc damage prevention device, to the body 10 of which a bracket 15 is connected for connection to the earthing. In this arc damage prevention device, the trough-shaped body 10 is fixed to the conductor 12 by U-shaped bolts 16 and 17, the ends of which are threaded with nuts 19 to 22 (22 of which are not shown in the figures). A contact piece 18 is arranged between the U-shaped bolts 16 and 17 and the non-insulated part 13 of the conductor 12. The bracket 15 is fixed to the body 10 by fitting its perforated ends under the transducers 19 30 and 20. Substantially truncated cone-shaped extensions 23 are formed at the ends of the mounting chute of the conductor 12.

Although in the embodiments described above, the principle of forming an extension to the ends of a conductor mounting groove or trough has been described only in connection with arc protection devices having a trough-like body or other wire construction components suitable for a similar function, it is understood that it can also be applied to any body shape. from two or more parts to the body pieces to be assembled around the conductor. In this case, the conductor also does not necessarily have to be peeled around from the attachment point of the arc-5 damage prevention device, but the insulation can be removed, for example, only in respect of the circumference of the conductor.

Claims (3)

An arc protection device or other conductor component for a similar function for insulated open conductors comprising a conductor and surrounding thin insulation, comprising at least one end of an expanded body (1) and means (7, 8) for securing the body to at least a partially uninsulated portion of the conductor (4). 6), characterized in that extensions (9) are formed at the ends of the mounting groove (4) of the conductor 10 in the body (1), which are concentric with the conductor (4) when the conductor is mounted. Device according to Claim 1, characterized in that the extensions (9) are substantially cylindrical and have a diameter greater than the diameter of the conductor (4). Device according to Claim 1, characterized in that the extensions (23) are substantially frustoconical and have a base diameter 20 greater than the diameter of the conductor (4).