Apparatus for testing the shaft/bearing insulation of a turbo-ma

Details Apparatus for testing the shaft/bearing insulation of a turbo-ma Apparatus for testing the shaft/bearing insulation of a turbo-ma

1977-04-13

1978-10-24

Strecker, Gerard R.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

G01R 3112

Patent

active

041223888

ABSTRACT:
Apparatus provided for testing the shaft/bearing insulation 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 applying an increasing test voltage between the shaft bearing which is grounded and the earthing brush while the shaft-earthing connection remains broken, this being in the form of a progressively charged capacitor connected between the shaft bearing and earthing brush, and a third circuit arrangement is provided for measuring 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.

REFERENCES:
patent: 2310335 (1943-02-01), Wolfson
patent: 2650346 (1953-08-01), Rasor
patent: 3303410 (1967-02-01), Hoover et al.
patent: 3746979 (1973-07-01), Kildishev et al.
patent: 3831160 (1974-08-01), Cronin et al.
patent: 3904940 (1975-09-01), Burrus

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