Importance

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Abstract

The present invention relates to a method for calibrating a short-circuit indicator (1) for identifying a short circuit and/or a ground fault in a connected voltage grid (5) by means of an evaluation unit (3). A calibration unit (2) automatically measures at least one value of the currents and/or the voltages of the phases (1A, 1B, 1C) of the voltage grid (5), which value is characteristic of the normal operation of the voltage grid (5), and checks whether the measured characteristic value is within a validity range characterizing the normal operation. The calibration unit (2), in the event of successful checking, measures the normal values of the voltages and/or the currents of all phases (1A, 1B, 1C) of the voltage grid (5) and makes these normal values available to the evaluation unit (3) for identification of the short circuit and/or the ground fault and the direction of the fault location in the voltage grid (5). In addition, the invention comprises a short-circuit indicator (1) for applying a method according to the invention.

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First Claim