Electricity: conductors and insulators – Conduits – cables or conductors – With interior conductor or cable supports
Patent
1998-07-09
2000-07-11
Kincaid, Kristine
Electricity: conductors and insulators
Conduits, cables or conductors
With interior conductor or cable supports
174 99B, 174 24, 174 28, 174 25G, H02G 500, H02G 506, H01B 900
Patent
active
060875909
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to an enclosed highvoltage electric line.
BACKGROUND INFORMATION
U.S. Pat. No. 2,280,200 describes a coaxial electric line where the internal conductor has diametrically opposed pairs of boreholes into which are inserted the post insulators which are supported on the inside wall of an enclosure and thus secure the conductor coaxially to the enclosure.
U.S. Pat. No. 3,344,370 describes a method of securing a conductor within an enclosure by means of post insulators. The ends of the post insulators that extend beyond the conductor may each be surrounded by a sleeve to set the distance between the conductor and the enclosure.
German Patent No. 31 41 437 describes a high-voltage conductor provided with supporting elements, each having on the high-voltage side a metallic liner in which a screw that passes through the high-voltage conductor engages. An electrically conducting foot that slides along the enclosure wall is provided at the other end of the respective supporting element.
U.S. Pat. No. 2,207,522 describes a coaxial line where the post-shaped insulator parts are held in sleeves that also form field electrodes and where a gap that is filled with a cement is also provided between the sleeves and the insulator parts.
SUMMARY OF THE INVENTION
The present invention is directed to an enclosed high-voltage electric line with a high-voltage electric conductor which is supported by means of one or more supporting elements, each with at least one insulator part inside the enclosure and which has at least one borehole to accommodate one end of a supporting element. At least one supporting element has a metallic sleeve that passes at least partially through the borehole, is supported in the area of the edge of the borehole, surrounds a portion of the insulator part and forms a stop in its interior to limit any displacement of the insulator part into the borehole. The sleeve is cylindrical in design, partially surrounds a part of the insulator body that projects out of the outside surface of the high-voltage conductor and has a field control electrode there that concentrically surrounds the respective insulator part.
An object of the present invention is to provide such a high-voltage line so as to have an especially great high-voltage strength and long useful life while being inexpensive and easy to assemble. This object is achieved according to the present invention by the fact that the sleeve is partially in direct contact with the insulator part and is widened in the area of the field control electrode so that the field control electrode surrounds the insulator part at a distance.
In accordance with the present invention, the insulator part is protected by a sleeve in the area where the borehole passes through the high-voltage conductor and it is also supported inside this sleeve so that the sleeve transmits the supporting force of the insulator to the high-voltage conductor. This guarantees that the insulator part is not supported directly on the high-voltage conductor as is the case, for example, with the coaxial line described in U.S. Pat. No. 2,280,200. Such an area where the insulator part is supported on the high-voltage conductor and is thus exposed to high mechanical loads should not be additionally exposed to dielectric loads.
According to the present invention, the area where the insulator part of the supporting element is supported is located inside the metallic sleeve and is thus in a field-free space. The metallic sleeve is in turn supported on the high-voltage conductor in the area of the edge of the borehole.
Supporting elements can be assembled prior to mounting by pushing the sleeves onto the insulator parts. Only boreholes need be provided in the high-voltage conductor. No other processing of the high-voltage conductor is necessary.
The supporting elements can be distributed in a spiral pattern, for example, along the high-voltage line between the high-voltage conductor and the enclosure. Several supporting elements may also be arrang
REFERENCES:
patent: 2207522 (1940-07-01), Smith et al.
patent: 2218921 (1940-10-01), Mieller
patent: 2939903 (1960-06-01), Lapsley et al.
patent: 4414424 (1983-11-01), Mizoguchi et al.
patent: 5488199 (1996-01-01), Selsing et al.
Lorenz Dieter
Meinherz Manfred
Kincaid Kristine
Olds Mark
Siemens Aktiengesellschaft
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