Method for producing a fault signal which indicates a short...

Details Method for producing a fault signal which indicates a short... Method for producing a fault signal which indicates a short...

2006-02-14

2006-02-14

Deb, Anjan (Department: 2858)

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

Of ground fault indication

C324S522000, C361S042000

Reexamination Certificate

active

06998848

ABSTRACT:
A method and apparatus for producing a fault signal are disclosed which indicate a short to ground on a polyphase power transmission line, in which, the phase currents on the power transmission line are detected by means of current transformers in order to form a sum current measured value. Furthermore, a first short to ground suspicion signal is produced if the sum current measured value is greater than a predetermined current threshold value, the phase voltages on the power transmission line are detected in order to form a residual voltage measured value, and a second short to ground suspicion signal is produced if the residual voltage measured value is greater than a predetermined voltage threshold value, and a fault signal which indicates a short to ground is produced if at least one short to ground suspicion signal is present.

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7SA522 Manual; C53000-G1176-C155-2; p. 6-28-6-30.

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