Method and device for determining ground faults on the conductor

Details Method and device for determining ground faults on the conductor Method and device for determining ground faults on the conductor

1994-07-26

1996-04-16

Wieder, Kenneth A.

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

Of individual circuit component or element

324510, 324511, 324772, 340650, 361 42, G01K 3134, H02H 706

Patent

active

055086209

ABSTRACT:
A method is specified for detecting ground faults on the conductors of electrical machines, in which method the fault resistance (Rf) is directly calculated in a numerical evaluation unit (7) from the injected (Ui) and the measured (URE) voltages. Since the fault resistance is explicitly calculated and displayed, it is independent of influences from the ground reactance. Moreover, there is no need to, for each machine, characteristics for drawing conclusions on the fault resistance. Moreover, the influence of ageing, temperature fluctuations, injection level fluctuations etc. is eliminated due to the numerical calculation. (FIG. 1a)

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