Electricity: conductors and insulators – With fluids or vacuum – Conduits – cables and conductors
Patent
1997-11-21
1999-05-25
Kincaid, Kristine
Electricity: conductors and insulators
With fluids or vacuum
Conduits, cables and conductors
174 99B, H02G 506
Patent
active
059071230
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a high voltage line, and in particular a high voltage line having an insulating support for a metal sheath, the insulating support being fixed to the high voltage line with a securing element.
BACKGROUND INFORMATION
U.S. Pat. No. 4,161,621 describes a metal-sheathed, high-voltage line with a high-voltage conductor.
A securing element for insulating supports inside a metal sheath is described there, where rings are provided that are in contact with the metal sheath and support webs between which an insulating support is secured.
SUMMARY OF THE INVENTION
An object of the present invention is to provide an improved metal-sheathed high-voltage line with a high-voltage conductor surrounded coaxially by a metal sheath and with at least one securing element for a disk-shaped insulating support having a first and second ring, each of which is concentric with the high-voltage conductor and each having a web projecting radially with respect to the longitudinal axis of the high-voltage line. The insulating support is secured between the webs of the rings.
The aforementioned object is achieved according to the present invention by the fact that at least one of the rings directly surrounds the high-voltage conductor, and the rings are pressed against each other in the axial direction of the high-voltage line, where there is at least a first wedge body that can be pressed against the high-voltage conductor by wedge action due to the axial pressure force, causing the rings to be pressed together, and thus the securing element is jammed tightly on the high-voltage conductor.
In particular to compensate for thermal strain during operation of the high-voltage line, it is advantageous if the insulating supports are attached either only to the high-voltage conductor or to the metal sheath and slide along the other part. The design according to the present invention is advantageous inasmuch as the rings and the insulating supports can be threaded in succession onto the high-voltage conductor, and then the rings can be pressed together by means of axial screws, for example, to secure the respective insulating support between the webs and also to fix the securing element through the wedge action of the wedge body on the high-voltage conductor so it cannot be displaced.
This assembly can be performed, for example, before the high-voltage conductor is inserted into the metal sheath, but it is also possible to first insert the high-voltage conductor and then insert the insulating supports successively. This does not require any structural adjustments or machining of the high-voltage conductor.
It may be advantageous for a third ring with a conical outside contour on which the insulating support is jammed tightly to be provided between the first and second rings.
This third ring centers the insulating support relative to the high-voltage conductor if this is not already accomplished by the webs.
The webs may encircle the rings concentrically and coaxially with the high-voltage conductor. However, it is also possible to provide webs on the rings merely in the form of individual elevations on the outer circumference of the rings.
It may also be advantageous for the third ring to be connected in one piece to the first or second ring.
This facilitates assembly of the securing element. The two rings or the three rings may have axial boreholes passing through them to make it possible to press the rings together in the axial direction of the high-voltage line by means of screws.
Another advantageous embodiment of this invention provides for the insulating support to have a ring on its outer circumference designed to allow the insulating support to more easily slide along the inside wall of the metal sheath.
This design ensures an easily sliding connection between the insulating support and the metal sheath.
As a ring or partial ring with a wedge-shaped cross section, the wedge body may partially or entirely surround the high-voltage conductor. Several wedge bodies may also be d
REFERENCES:
patent: 3809795 (1974-05-01), Olsen et al.
patent: 4161621 (1979-07-01), Bolin
patent: 5416266 (1995-05-01), Muller
patent: 5571990 (1996-11-01), Pham et al.
Kelch Thomas
Lobner Friedrich
Meinherz Manfred
Kincaid Kristine
Nguyen Chau N.
Siemens Aktiengesellschaft
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