High-voltage switches with arc preventing or extinguishing devic – Arc preventing or extinguishing devices – Air-current blowout
Patent
1999-05-28
2000-10-03
Scott, J. R.
High-voltage switches with arc preventing or extinguishing devic
Arc preventing or extinguishing devices
Air-current blowout
174 18, 361605, 218 68, 218 79, H01H 3302, H02B 1302, H05K 500
Patent
active
061276413
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a three-pole, gas-insulated high-voltage switchgear having three metallic enclosure housings arranged next to one another, one for each circuit breaker, in which two lead-in insulators are arranged on each enclosure housing, and the lead-in insulators of both outer enclosure housings are laterally inclined away from the central enclosure housing.
BACKGROUND INFORMATION
European Patent No. 0 560 588 describes that a required insulating distance is provided between terminals of both lead-in insulators of an enclosure housing of each pole of a high-voltage switchgear accommodating a circuit breaker by arranging the lead-in insulators so that they are inclined away from one another forming a symmetrical V shape. In order to maintain the required insulating distance between the terminals of the lead-in insulators of adjacent enclosure housings of a three-pole, gas-insulated, metal-enclosed high-voltage switchgear that accommodate the circuit breaker, according to European Patent No. 0 405 253, the two outer enclosure housings of the three adjacent enclosure housings are rotated about their longitudinal axes. This requires not only that different terminals be provided for the enclosure housings, but also that there be expensive connecting webs for a ground electrode and an isolating switch and their drives, since these are not in the same plane due to the rotation of the outer enclosure housing.
According to Swiss Patent No. 558 092, lead-in insulators of metal-enclosed high-voltage switchgear can be arranged with their terminals on an enclosure housing via an additional housing having two housing parts connected by a swiveling device, so that the lead-in insulators of each enclosure housing can be swivelled into a position where they are symmetrically inclined away from one another. However, use of the additional housing to accommodate an isolating switch is made difficult with the switchgear described therein due to the swiveling of the lead-in insulators from their transport position into their operating position.
SUMMARY
The object of the present invention is to provide a high-voltage switchgear that allows the lead-in insulators to swivel into their operating position, with isolating switches arranged in a more favorable manner to ensuring their reliable operation.
This object is achieved according to the present invention by the fact that each of the lead-in insulators of the two outer enclosure housings is connected to a respective additional housing constituting an elbow-shaped housing, first leg being attached to respective enclosure housing and a second leg, perpendicular to its longitudinal axis, supporting the lead-in insulator, and the second leg having a rotational joint rotatable about the longitudinal axis of the second leg.
Thus the lead-in insulators may swivel without requiring the respective enclosure housing or a stationary part of the respective additional housing to move. Different additional housings may therefore be connected using fixed braces, and the switchgear located in the additional housings may be jointly actuated using a drive mechanism independent of the swivel position of the lead-in insulators.
In order to make it easier for the lead-in insulators of the two outer poles to swivel into their operating position, according to a preferred embodiment each of these lead-through insulators is essentially perpendicular to the second leg.
The first leg of each additional housing may also advantageously have a rotating joint rotatable about the longitudinal axis of the first leg.
Each additional housing may also be advantageously connected to a connection piece, provided on a lateral surface of a cylindrical enclosure housing and inclined outward at an acute angle to its longitudinal axis.
Taking into consideration the swiveling of the lead-in insulators of the two outer poles into the operating position allowed by the present invention, advantageous embodiments are also obtained for mounting an isolating switch in the addi
REFERENCES:
patent: 3665135 (1972-05-01), Boersma et al.
patent: 4016382 (1977-04-01), Roth
patent: 4255632 (1981-03-01), Backskog
patent: 4440998 (1984-04-01), McConnell et al.
Scott J. R.
Siemens Aktiengesellschaft
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