Electricity: conductors and insulators – With fluids or vacuum – Conduit or cable joints
Patent
1999-12-21
2000-12-26
Kincaid, Kristine
Electricity: conductors and insulators
With fluids or vacuum
Conduit or cable joints
174 21JS, 174 28, H02G 506
Patent
active
061663239
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to power distribution, in particular a device for designing enclosed, gas-insulated high-voltage systems having an inner conductor and an outer conductor arranged concentrically to the inner conductor in which, between two enclosed gas chambers, a connecting unit is positioned that includes an enclosure and a multi-segment, detachable inner conductor connection extending in an axial direction as well as two conical partitioning insulators located at flange-like ends of the enclosure.
BACKGROUND INFORMATION
Enclosed, gas-insulated high-voltage switchgear, as described in the publication High-Voltage SF.sub.6 Switchgear Installations, Applications and Performance, is commonly provided with a connecting unit in the form of a disconnector between two gas chambers in a system, for example, between a cable inlet a circuit breaker or between the circuit breaker and an adjacent busbar. This connecting unit contains a detachable inner conductor connection extending in an axial direction in an enclosure and is provided, at the ends of the enclosure, with two conical partitioning insulators which extend inside the adjacent gas chambers. The multi-segment inner conductor connection includes a stationary switching contact with an assigned shield electrode fixed axially and radially in one of the partitioning insulators, a contact pin that can move in the axial direction, and a contact pin guide with an assigned shield contact fixed axially and radially on the other partitioning insulator. The contact pin drive is flanged radially onto the perimeter of the enclosure. A further closable opening may be provided for grounding purposes on an opposite side page.
U.S. Pat. Nos. 3,331,911 and 4,053,700 describe gas-insulated power transmission systems with tubular inner conductors and tubular outer conductors also using partitioning insulators in order to separate the gas chambers of the individual system sections from one another. For this purpose, the partitioning insulators are usually clamped tightly between two connecting flanges in the area of the outer conductor, while, in the area of the inner conductor, they are seated leak-proof on the inner conductor or also clamped to form a seal between two inner conductor segments. U.S. Pat. No. 4,323,720 describes another conventional method providing, in the area of one partitioning insulator, an inner conductor connection that may be detached after the system has been assembled, with two longitudinal segments of the inner conductor engaging with each other like claws and being locked in place axially by pins extending through the claws. In the area of this conductor connection, a special housing part is used whose one connecting flange is inclined with respect to the system axis. It is also possible to provide two housing parts of this type one behind the other so that the connecting flanges of both adjacent system sections are positioned at right angles to the tube axis.
SUMMARY OF THE INVENTION
An object of the present invention is to design a connecting unit so that two sections of a gas-insulated power transmission system, in which a tubular inner conductor is supported against a tubular outer conductor by insulating spacers, may be separated from one another, providing access to inner conductors of adjacent gas chambers for test purposes.
This object is achieved according to the present invention in that the inner conductor connection includes four tubular conductor segments, of which the first and second as well as the second and third conductor segments are interconnected like claws so that they may be separated. For this purpose, an enclosure is provided with a closable installation opening, and the third conductor segment plugs into the fourth conductor segment, which is fixed axially in place. The first and fourth conductor segments must be fixed in place axially, using a further conductor segment positioned on the other side of the partitioning insulator. Another important aspect of the present invention is
REFERENCES:
patent: 3331911 (1967-07-01), Whitehead
patent: 4053700 (1977-10-01), Meyer
patent: 4323720 (1982-04-01), Orgeret
H.P. Szente-Varga, "High-Voltage SF.sub.6 Switchgear Installations, Applications and Performance," Brown Boveri Review, vol. 62, p. 140, Figure 3, Apr. 1975.
Braunlich Christoph
Kelch Thomas
Kieper Mario
Kincaid Kristine
Nguyen Chau N.
Siemens AG
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