DE352857C - Electric overhead line - Google Patents

Description

GERMAN EMPIRE

ISSUED ON MAY 6, 1922

REICH PATENT OFFICE

PATENT LETTERING

- JKl 352857 - CLASS 21c GROUP 13

Naamlooze Vennootschap: Lijn-Protectie Maatschappij tot exploitatie van Electro-Technische en other Octrooien in The Hague, Holland.

Electric overhead line. Patented in the German Empire on March 9, 1921.

According to the Union Verirage of June 2, 1911, the priority for this registration is due of the application in Holland of January 27, 1Q21 claimed.

The invention relates to overhead lines with divided conductors.

In certain security systems for electrical power networks, e.g. B. according to patent 313542, it is necessary to form the conductor of each phase so that its cross-section is in is divided into two very unequal parts such that ζ. B. from a single strand Wire is stripped. In the case of the security systems mentioned, these are now unequal Partial conductor both traversed by the useful current and in parts with each other tied together. The two sub-conductors are also under the same operating voltage, it will an auxiliary voltage that is small compared to the operating voltage only because of certain devices between the same during operation maintained automatically.

In the case of insulated cables, it is easy to adjust the conductor cross-section according to the above requirements to construct, you can z. B. simply stripped one wire of the strand with the other Strand wires.

A similar design is known from patent 288858 for overhead lines. Because mechanical and weather influences, however, this construction has certain disadvantages for the durability of the insulation of the secondary conductor.

If you suspend the secondary conductor on special insulators for the overhead line, two unpleasant disadvantages arise from the fact that, firstly, the load-bearing capacity of a thin wire of, for example, iV * to 4 sqmm is insufficient with the usual mast spacings, and secondly, such a thin wire is already at relatively low voltage reaches the critical voltage where the corona phenomena begin.

The latter circumstance in particular stands for the use of this arrangement for high-voltage lines opposite.

The present invention overcomes these disadvantages. It is based on the new knowledge that when a thin wire is suspended as an overhead conductor very close to a thick one Conductor increases the corona stress of the thin wire several times and more or less equal to the corona stress of the thick conductor if both conductors are kept at approximately the same potentials.

According to the invention, the thin wire is therefore at one or more points between two masts hung in isolation from the thick ladder, in such a way that it 4u generally 10 cm or less, most thick Ladder is guided and carried by the latter, d. H. relieved at the suspension points will. If insulated wire is used, it can be as close to the thick conductor lie that he touches him.

Overhead lines with partial conductors are already known. Such lines are, however, a conductor that is divided into two parts is divided by the same cross-section, each of the two sub-conductors is self-supporting. It is readily apparent that with such a system the difficulties encountered with strongly dissimilar partial conductors exist, do not exist, since of course there are two equally strong halves of a ladder each can support itself just as well as. the others and also 'do not differ from the other with regard to the corona phenomena differs. The above-mentioned new observation about the increase in corona stress on the other hand refers to the case where a comparatively thin conductor is close to a thick one, with a kind of protective effect due to the predominant electrostatic field of the thick conductor is exerted on the thin conductor with respect to the corona stress.

In the accompanying drawings, some embodiments of the invention are for example shown.

Fig. Ι shows how the subdivision can be carried out. The main conductor 1 is in usually attached to insulators 2, while the other conductor 3 as an auxiliary wire on Main ladder is suspended.

In Figs. 2 and 3 is shown in side view and in plan how the auxiliary wire tensioned and can be guided past the isolator.

In Fig. 4 it is illustrated how the auxiliary wire when using the suspension insulators can be attached. In this case you can put the auxiliary wire under the insulator just carry out and if necessary, relax.

The isolated suspension can be done in different ways. The suspension element 4, 5 and 6 can itself be designed as an insulator or contain one; however, either one of the two conductors or both can have an insulating layer be enveloped. Finally, both the hanging element and one or both Head insulated.

When the suspension element is clamped to the auxiliary wire and thus attached to the main conductor is that it can slide along the same, it is easily possible to use the auxiliary wire to be attached to existing lines, if the same is added later should be provided with an appropriate protection system.

Claims (1)

Patent claim: Electric overhead line with unequal partial conductors, in particular for use with safety systems, characterized in that to avoid premature corona phenomena and impermissible mechanical stress on the thin no partial conductor, the latter close to the thick one Part conductor is suspended. 1 sheet of drawings.