H - Electricity – 01 – H
Patent
H - Electricity
01
H
306/215
H01H 33/66 (2006.01) H01H 33/664 (2006.01)
Patent
CA 1108675
ABSTRACT A high tension vacuum switch, comprising two relatively axially movable switching contacts and two annular shielding electrodes, of which each one is associated and elec- trically coupled with a respective one of said switching con- tacts and projects slightly beyond the contact surface of said contact in the direction towards the other switching contact. At least one of the shielding electrodes is capacitively coupled with its respective switching contact so as to add the advantage of much smaller overall dimensions for a switch of this kind. At least one of the switching contacts is supported by a contact rod and between said contact rod and the respective shielding electrode, radially seen, a layer of insulating material is provided, for example in the form of a piece of tubing which extends over at least a portion of the shielding electrode to support the latter. In a specific embodiment of the invention, a cylinder capacitor is provided which is constituted by an outer electrode formed by at least a portion of the shielding electrode, a cylindrical inner electrode galvanically connected with the respective switching contact and the piece of tubing of insulating material interposed between said electrodes. The shielding electrode may be a body of woven wire or metalized threads so as to enable metal particles torn loose from a switching contact by an arc to mainly pass through unhindered.A further advantage is that such a shielding electrode may be located at a relatively small distance from its switching contact, which in turn leads to a construction - 1 - in which the two shielding electrodes are so formed and of such dimensions as to ensure that in the closed condition of the switch one electrode surrounds the other one with clearance. Such a measure not only provides the possibility of realising a switch of relatively small dimensions but also the possibility of simplifying the driving mechanism so as to adapt the latter one to actuation only of a switch embodiment in which one switching contact is a fixed contact and is pro- vided with a fixed shielding electrode and the other switching contact is a movable contact and carries a shielding electrode adapted to be moved along therewith. - 1a -
315924
Griesen Bertus
Gundlach Harry C.w.
Fetherstonhaugh & Co.
Hazemeijer B.v.
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