G - Physics – 01 – R
Patent
G - Physics
01
R
324/29.2
G01R 27/26 (2006.01) G01R 19/145 (2006.01) G01R 27/02 (2006.01) G01R 27/18 (2006.01)
Patent
CA 1074400
TITLE APPARATUS FOR TESTING THE SHAFT/BEARING INSULATION OF A TURBO-MACHINE A B S T R A C T Apparatus provided for besting the shaft/bearing insu- lation characteristic of a rotary machine, e.g., a turbo- machine, wherein the shaft is normally earthed by means of an earthing brush on the shaft and connected to ground. A first circuit arrangement is provided for breaking the shaft-earthing connection, a second circuit arrangement is provided for apply- ing an increasing test voltage between the shaft bearing which is grounded and the earthing brush while the shaft-earthing con- nection remains broken, this being in the form of a progressively charged capacitor connected between the shaft bearing and earth- ing brush, and a third circuit arrangement is provided for mea- suring the change in voltage across the capacitor resulting from a breakdown in the insulation between the shaft and its bearing during the testing operation. The testing operation is performed periodically and a test cycle is terminated as soon as the test voltage reaches a predetermined maximum value, or there is a breakdown in the insulation between the shaft and its bearing whichever occurs first. - 1 -
276718
Bernasconi Felix R.
Salm Max
LandOfFree
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