Apparatus for monitoring earth faults on the rotor winding of a

Details Apparatus for monitoring earth faults on the rotor winding of a Apparatus for monitoring earth faults on the rotor winding of a

1986-06-02

1989-03-14

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

Of individual circuit component or element

324522, 324510, 340648, 340650, G01R 3106, G08B 2100

Patent

active

048127515

ABSTRACT:
It is known to detect a single breakdown of the electrical insulation separating the rotor winding from the earthed rotor body of a generator: such a failure does not lead to intense arcing, however, as there is no return path for current flowing to earth. Disclosed is a potential divider network which allows continuous monitoring of the voltages between earth and the two ends of the winding: a second breakdown can be rapidly detected since it results in a shift in both the position and magnitude of the effective resistance to earth from that associated with the first breakdown.

REFERENCES:
patent: 880565 (1908-03-01), Nicholson
patent: 2627540 (1953-02-01), Rich
patent: 3947759 (1976-03-01), Briggs
patent: 4187525 (1980-02-01), Nagura et al.

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