H - Electricity – 01 – T
Patent
H - Electricity
01
T
317/18
H01T 7/00 (2006.01) F03D 11/00 (2006.01) H01Q 1/50 (2006.01) H01T 1/14 (2006.01)
Patent
CA 1221729
ABSTRACT OF THE DISCLOSURE The invention relates to an overvoltage protector in an apparatus having two moving parts. The parts are in mutual com- munication via a bearing, one part being stationary in relation to a substructure at ground potential. The moving part can be subject to a voltage and the stationary part is electrically connected to the earthed subsubstructure. For preventing a cur- rent passing through the bearing between the parts, an electri- cal insulator is provided in the current path through the bearing. The moving part has a projection at a distance from an electrode connected to ground such that a spark discharge gap is formed be- tween mutually moving parts. The bearings are protected against current by the electrical insulator up to a given voltage thres- hold. In order that this voltage threshold will not be exceeded, the spark discharge gap comes into operation at a lower value than this voltage threshold and keeps the voltage difference between the parts at this lower value.
438711
Akerlund John
Scuka Viktor
Marks & Clerk
Telefonaktiebolaget Lm Ericsson
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