DE4100070C2 - - Google Patents

Description

The invention relates to an AC High current conductor of power distribution or Energy transmission according to the preamble of claim 1. Such AC conductors are e.g. B. busbars as well Busbar branches of switchgear, diversions or introductions to switchgear or electrical Devices, connecting lines between electrical Devices, generator rejects, gas pipe, cables, etc.

The magnetic field induces electrical alternating currents in conductors electrical field strengths that lead to a lead to uneven current distribution in the conductors. The uneven current distribution in conductors has one increased electrical resistance compared to Direct current. This means the same conductors the current carrying capacity with alternating current is smaller than with Direct current.  

Conductors that carry higher currents are often in divided several sub-conductors. As the main leader is a single conductor or a composite arrangement a number of conductors that make up the total current of a Lead Stranges, designated. As a sub-leader, a Conductor of a certain part of the total current of a strand and is part of the main conductor, designated.

The reduced current carrying capacity of AC main conductors where rectangular Partial conductors are arranged in packages (see DIN 43 670 and DIN 43 671).

The reduced current carrying capacity follows from:

• - The current displacement within the sub-conductor, as well out
• - the uneven current distribution between the Partial conductors.

In the case of rectangular partial conductors, arranged in packages the outer partial conductors are loaded more than the ones inside. It is even more pronounced uneven current distribution with concentric partial conductors, where the outermost pipe carries almost all of the current. With parallel running rectangular busbars is one Known solution in which the partial conductor in the line direction staggered. (CH-PS 2 19 274).

The object of the present invention is an interpretation for rigid high current conductor, with concentric or concentric-like partial conductor arrangement from Switchgear and power transmission lines too find that smoothes the current distribution and to show appropriate solutions. The inventive solution to this problem is claimed 1 shown.

An equalization of the current distribution can be realized if the position of the partial conductors along the Executive is changed. It is advantageous if the partial conductors are proportional along the main conductor go through all typical magnetic field areas. Thereby are those induced in the individual partial conductors Tension equalized and thus the subconductor about the same currents.

With concentric conductors, such as shown in FIG. 2, or with arrangements that are similar to concentric conductors (such as shown in FIG. 5), the uneven current distributions are particularly significant.

Since in these arrangements the cladding tube or the outer Partial conductor carry almost all of the current of the main conductor, such designs are used extremely rarely. By changing the position of the partial conductor sections in The course of the executive may be almost the same Power distribution can be realized. Such a solution is especially important in the executions where a greater current carrying capacity is required, however the Main conductor dimensions cannot be enlarged can (e.g. with gas-insulated switchgear with Pipe busbars).

In the case of concentric partial conductors, a solution according to FIG. 1 can be carried out. The cladding tube and the inner conductor are slotted in opposite directions and connected by conductive intermediate pieces so that in the course of the main conductor a current transfer from the first section of the outer conductor to the second section of the inner conductor and (almost) a current transfer from the first section of the inner conductor to the second section of the outer conductor is guaranteed (see Fig. 1). As a result, each of the two partial conductors of the main conductor is realized in one section as an outer conductor, in a second section as an inner conductor, and so - with sections of the same length - the current distribution between the partial conductors is evened out.

Since with this arrangement the cooling conditions of the Inner conductor are significantly worse than that of the Cladding tube, measures to improve the Heat emission (gaps in the cladding tube or the like) can be provided. With an appropriate choice of the cross sections of the Cladding tube and the inner conductor and at appropriate Cooling measures can be taken with such an arrangement Current carrying capacity of a pipeline significantly increased will.

In further development of this idea, an arrangement according to FIG. 4 can also be selected, for example, wherein the cooling has been improved and the uniform current distribution between the partial conductors has been taken into account. If the gaps are arranged vertically, a cooling effect can additionally be achieved by the thermal buoyancy of the gas surrounding the conductors.

Conductive intermediate pieces (designated Z in the figures) ensure current conduction according to FIG. 6. A high mechanical strength is achieved by insulating intermediate pieces (designated P in the figures). The current transfer via the conductive intermediate pieces can be ensured by brazing or by screwing (screwed connections are indicated in FIGS. 7 to 9, for example).

With screw connections, make sure that no relevant shunt of the current flow through the Screw shaft arises (there may be corresponding distances and insulating inserts).

In a further development of the specified solution for the equalization of the current distribution, it seems to make sense to subdivide the main conductors into a larger number of partial conductors, the positions of the partial conductors in the main conductor being changed. This reduces the skin effect in the partial conductors themselves (current displacement in the individual partial conductors) and realizes a uniform current distribution between the partial conductors. This proposed solution is also important for round or semi-round conductor bundles (as shown in FIG. 5), which can be used for gas-insulated switchgear.

Reference numerals

Kn . . Kn crossing point in variant n
Pn1. . . Pn4 insulating spacers in variant n, No. 1. . . 4th
In1. . . In4 electricity in variant n, No. 1. . . 4th
Tn1. . . Tn4 partial conductor in variant n, No. 1. . . 4th
Zn1. . . Zn6 conductive intermediate pieces in variant n, No. 1. . . 6

Claims (3)

1. AC high-current conductor of the energy distribution or energy transmission, which is divided into rigid partial conductors that change their position so that an equalization of the current distribution between the partial conductors, or an increase in the current carrying capacity of the high current conductor is achieved, characterized in that the partial conductors are concentric or are arranged concentrically similar and change their position in the main conductor from the inner partial conductors to the outside, or from the outside to the inside. 2. AC high-current conductor according to claim 1, characterized, that the partial conductors are designed as concentric tubes are, the outer cladding tube to the Position change points slotted or Z-shaped slot and the current transitions from and to the slotted inner conductor laterally offset and / or offset along the conductor from the outer conductor to the Inner conductor and from inner conductor to the outer conductor respectively.   3. AC high-current conductor according to claim 1, characterized, that the partial conductors as segments of pipes, or similar to these, are formed, with the Position change places the outer segments at an angle slotted or Z-shaped and the Current transfers from and to the slotted inner conductors laterally offset and / or offset along the conductor from the outer conductors to the inner conductors and from the Inner conductors to the outer conductors.