Electricity: conductors and insulators – With fluids or vacuum – Conduits – cables and conductors
Reexamination Certificate
1999-11-23
2001-06-12
Reichard, Dean A. (Department: 2831)
Electricity: conductors and insulators
With fluids or vacuum
Conduits, cables and conductors
C174S09900B
Reexamination Certificate
active
06245990
ABSTRACT:
BACKGROUND INFORMATION
1. Field of the Invention
The present invention relates to the field of gas-insulated tubular conductor arrangements as used for energy transmission, and is to be applied in the construction of those support regions, provided for the tubular inner conductor, in which insulating columnar supports are used as support elements.
2. Background Information
In a coventional tubular conductor arrangement such as that described in German Patent No. 44 44 554, a metallic sleeve is provided for the fixing of each columnar support to the tubular inner conductor; This sleeve surrounds the one end of the columnar support and at least partially penetrates a bored hole in the inner conductor. This sleeve can be fashioned as a blind hole, and can be provided with a rim fashioned as a field-control electrode. Using columnar supports of this type, a positioning of the tubular inner conductor above the midaxis of the encapsulating tube can be ensured in an easy-to-assemble manner (German Patent 195 15 308 C1). On the other hand, such a design of the support region requires a special mechanical processing (boring) of the inner conductor, which leads to a mechanical weakening of the conductor cross-section in the support plane.
SUMMARY
The present invention provides subject to as few limiting boundary conditions as possible in its manufacturing, transportation and assembly.
For the solution of this problem, it is proposed according to the present invention that, in the support region, the inner conductor is formed by a tubular intermediate piece manufactured by casting whose length is approximately twice its diameter and that is connected at its ends with the adjoining segments of the tubular inner conductor, and in that the blind-hole-type metallic sleeve is fashioned in one piece with the intermediate piece.
Given such a design of the support region, the individual segments of the tubular inner conductor can be manufactured without additional mechanical processing, and can be delivered to the construction site independent of the position and number of support regions in the tubular conductor arrangement. At the same time, the risk is minimized that the laterally bored tubular inner conductor can collapse due to transport or storing. The placing of the individual conductor parts into the casing of the tubular conductor arrangement is subject to fewer limiting boundary conditions, since tubular conductor segments of different lengths can be combined, so that for example shorter conductor pieces can also be processed. Due to the construction of the support region with the aid of a cast part, there result advantageous space relations, and thus additional constructive possibilities, so that the cast part, provided as a connecting piece, can be optimized dielectrically and mechanically. In this way, for example the possibility arises, given two or three columnar supports used in a support region, to push these supports together more tightly axially, or even to place them in one plane. When the columnar supports are pushed together tightly axially, the inner casting geometry also stabilizes the intermediate piece as a whole. Through the use of a cast intermediate piece, tolerance problems inside the support plane are also reduced; In addition, the integration of the sleeve into the intermediate piece offers a high degree of security against slivers (chips) that can be present in the inner conductor as a result of the processing of the ends of the parts of the inner conductor for connection purposes, and that could fall out later.
During the insertion of the new intermediate piece into the curve of the tubular inner conductor, it is useful to proceed in such a way that first the intermediate piece is connected with the two adjacent segments of the inner conductor either frictionally, materially, or in form-locked fashion, and that subsequently the columnar support or supports are placed into the intermediate piece. The connection of the intermediate piece with the subsequent segment of the inner conductor can be a shrink fit, a welded connection or a pressure-laminated connection, a plugged connection or a screwed connection, using a screw terminal or using axially overlapping end segments.
Given intermediate pieces in which the columnar supports have a certain axial spacing from one another, for mechanical stabilization it can be useful for the blind-hole-type sleeve-shaped region of the intermediate piece to be supported on the tubular region using a stiffening rib.
With the aid of the intermediate piece, the construction of the tubular conductor arrangement as a whole can also be taken into account, in that the intermediate piece has and after for example one or two radial openings through which the inner space of the inner conductor can be evacuated or can be filled with a gas mixture. With regard to the monitoring of the arrangement as a whole, the intermediate piece can also be used to house sensors, surface wave filters for measuring pressure and temperature. Sensors of this sort can be placed into the intermediate piece before the connection of the intermediate piece with the subsequent conductor segments, or through small cast openings. In addition, longitudinal or transverse slots that act as antennae can be installed.
In addition, the tubular intermediate piece can be used to strengthen the tubular conductor arrangement with regard to short-circuit loads. If the inner conductor is provided with only two supports, short-circuit forces could cause a radial displacement of the inner conductor. This can be prevented by arranging in the tubular intermediate piece one or two inserts that are made of aluminum or high-grade steel and that significantly increase the mass of the intermediate piece.
REFERENCES:
patent: 2589328 (1952-03-01), Bondon
patent: 2939903 (1960-06-01), Lapsley et al.
patent: 3373242 (1968-03-01), Sewell
patent: 4414424 (1983-11-01), Mizoguchi et al.
patent: 4417094 (1983-11-01), Spencer
patent: 6087590 (2000-07-01), Meinherz et al.
patent: 23 60 070 (1975-06-01), None
patent: 195 15 308 (1996-05-01), None
patent: 44 44 554 (1996-06-01), None
patent: 852 037 (1940-01-01), None
patent: 2 581 484 (1986-11-01), None
Kenyon & Kenyon
Nguyen Chau N.
Reichard Dean A.
Siemens Aktiengesellschaft
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