Electricity: electrical systems and devices – Housing or mounting assemblies with diverse electrical... – For electronic systems and devices
Patent
1993-09-22
1994-12-06
Thompson, Gregory D.
Electricity: electrical systems and devices
Housing or mounting assemblies with diverse electrical...
For electronic systems and devices
361677, 361690, H05K 720
Patent
active
053716515
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a power semiconductor valve device for outdoor location in an enclosure which is electrically insulated against the surroundings. By power semiconductor valve device, in the following abbreviated to "valve device", is meant in this application a device comprising one or more power semiconductor valves located in a common enclosure. By power semiconductor valve is meant a set of one or more, controllable or non-controllable, power semiconductor components, for example thyristors or diodes, which electrically function as a unit.
BACKGROUND ART
It is known to place valve devices, for example thyristor valves included in plants for series compensation of a.c. lines or for conversion between alternating current and high-voltage direct current, in enclosures suited for outdoor erection, these enclosures being electrically insulated against the surroundings by being located on support insulators of porcelain. It is also known from Japanese patent application JP 63-80763 (A) to pass a light guide to a thyristor valve, located indoors and erected in an insulating manner, by arranging the light guide inside a hollow porcelain insulator filled with SF6 gas. By supplying the valve device with control signals and other media via a separate insulator, possibilities are opened for separately designing both this separate insulator and the support insulators in an optimum manner in view of their respective functions.
An insulator adapted for supply of control signals must in general be designed with a larger diameter than the support insulators, and particularly in those cases where it is additionally utilized for supply and/or removal of temperature-influencing media for the valve device and/or the insulating medium of the valve device. A porcelain insulator for this purpose is therefore usually heavy and difficult to manufacture, particularly in the lengths which may be required for high-voltage plants. Particularly in plants for high-voltage direct current, it must also be taken into consideration that the risk of flashover across the insulators is greatly depending on deposits on the insulator surfaces, and therefore it is desirable with a hydrophobic insulator surface in the case of outdoor location. The internal dielectric strength of the insulator is negatively influenced by the channels and conductors which are placed therein for the purposes stated above, so it is important that the risk of condensation and the ensuing risks of flashover are minimized by control of the climate in the interior of the insulator.
SUMMARY OF THE INVENTION
The invention aims to provide a valve device of the kind described in the introduction, the supply of which with information-carrying signals and/or of media for influencing the temperature of the valve device and/or the insulating medium of the valve device takes place by an insulator which exhibits good electrical and thermal insulating properties and which is simple to manufacture in large lengths.
What characterizes a valve device according to the invention will be clear from the appended claims.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be explained in greater detail by describing embodiments with reference to the accompanying drawings, wherein
FIG. 1 shows a valve device according to the invention,
FIG. 2 shows a vertical section of a communication insulator according to the invention,
FIG. 3 shows a horizontal section of a communication insulator according to FIG. 2,
FIG. 4 shows the main circuits for a 12-pulse converter according to an advantageous embodiment of the valve device, and
FIG. 5 shows an overall view of the converter according to FIG. 4.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
FIG. 1 shows a partially cut-away enclosure 1 for a thyristor valve included in a plant for transmission of high-voltage direct current. The enclosure comprises a body of a steel framework (not further shown), which supports a double-walled casing of sheet metal. Between the sheets, a layer of mineral wool has been pl
REFERENCES:
patent: 3989884 (1976-11-01), Friedrich et al.
patent: 4818319 (1989-04-01), Beer et al.
Asplund Gunnar
Astrom Urban
Sandin Bjorn
Asea Brown Boveri AB
Thompson Gregory D.
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