Electricity: circuit makers and breakers – Liquid contact – Time delay
Patent
1992-05-27
1995-01-17
Pellinen, A. D.
Electricity: circuit makers and breakers
Liquid contact
Time delay
200 50A, 200148B, H01H 3354, H01H 3350
Patent
active
053827651
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates generally to grounding switches for a compressed-gas-insulated, metal-encased high-voltage switching systems, and more particularly to such a grounding switch in which the casing as well as the housing is applied to ground potential. Furthermore, the present invention relates to such a grounding switch in which the movable switching piece is insulated in gas form or by insulation material in the housing of the grounding switch, and is moved by a rotating drive shaft. Finally, the present invention relates to such a grounding switch in which the drive shaft passes through the housing, and contact elements transfer the ground potential to the movable switching piece, where the connection to the ground potential is disconnectable.
EP-A-0 075 922 discloses such a grounding switch. This known grounding switch serves not only to transfer the ground potential, but is also insulated for measurement purposes. For this reason the disconnectable connection to ground potential, which is structured so as to be disconnected, is eliminated. In the known grounding switch, a ring of insulation material is provided between the casing of the high-tension switching system and the housing of the grounding switch, which galvanically separates the two parts. These two parts normally carry ground potential. The means for transferring ground potential to the movable switching piece has slide contacts resting against the switching piece and is insulated relative to the housing of the grounding switch, thus making the switching piece suitable also to carry measurement currents.
The present invention is directed to the problem of developing a means for transferring ground potential to the movable switching piece in the above described grounding switch, in a particularly simple manner.
SUMMARY OF THE INVENTION
The present invention solves this problem by providing that the drive shaft, which consists of electrically conductive material, pass into the housing in insulated form, by providing that the outside of the housing is connected with means for transferring the ground potential, and by providing that the movable switching piece is a switch blade rigidly connected with the drive shaft. The first end of the switch blade is designed not to bend and is coupled at a fixed and to the drive shaft, while the second end of the switch blade is designed to be elastic.
The rotating drive shaft thus fulfills a dual function: It serves not only to transfer force and movement to the movable switching piece, but also to introduce ground potential. This is made possible by insulating the drive shaft relative to the housing. To this end, a bushing of insulation material corresponding to the diameter of the drive shaft is sufficient. The connections which are present for force transfer from the drive shaft to the movable switching piece also conduct the potential, i.e. carry currents. The housing of the grounding switch does not have to be galvanically separated from the casing of the high-voltage switching system.
The movable switching piece is designed as a switch blade, which is rigidly connected with the drive shaft. When high short-circuit currents occur, the coupling between the switch blade and the drive shaft is exposed to high current forces. In order to prevent deformation or bending of the switch blade, the first end of the switch blade is designed not to bend, and is attached at a fixed angle to the drive shaft. The free end of the switch blade is designed to be elastic to allow lateral elastic deflection. In this way, tolerances in the relative positioning of the counter-contacts to the switch blade can be balanced out without any subsequent adjustment.
The blade contact is elastically deformed, if the positioning is not sufficiently accurate when it enters into the counter-contact. The blade holder is shorter compared with known blade holders, in order to leave an elastic region of the blade contact free.
Elastic deflectability of the blade contact can also be achieved, acco
REFERENCES:
patent: 3987260 (1976-10-01), Wilson
patent: 4314231 (1982-02-01), Walty
patent: 4427858 (1984-01-01), Fehr et al.
patent: 4486634 (1984-12-01), Nakano et al.
patent: 4536659 (1985-08-01), Seitz et al.
Geier Petra
Holler Helmut
Lorenz Dieter
Pfaff Dietrich
Pircher Christian
Friedhofer Michael A.
Pellinen A. D.
Siemens Aktiengesellschaft
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