DETECTION OF A SHORT CIRCUIT, IN PARTICULAR OF AN UNSTABLE SHORT CIRCUIT, IN THE ELECTRICAL NETWORK

摘要

1. A method for detecting a short circuit (10) in an electric network (1) of natural frequency (f), comprising the steps of: receiving a signal representing a current parameter (V) in the network (1) for at least twice a predetermined time interval (T); determine the frequency (f) of the received representative signal, wherein said signal (V) is considered to be sinusoidal; check that said specific frequency (f) is between the first and second threshold values; establish the presence of a short circuit (10) if fore stvuyuschaya check not udovletvoryaetsya.2. A short circuit detection method according to claim 1, wherein the first or second threshold values are respectively set by the natural frequency (f) of the network (1), to which the deviation (S) is added and subtracted accordingly. 3. A method for detecting a short circuit according to claim 1, wherein the frequency determination is performed by determining the frequency fluctuation (δf) with respect to the natural frequency (f). 4. A method for detecting a short circuit according to claim 1, wherein obtaining the representative signal (V) comprises receiving three consecutive values of the representative signal spaced by a predetermined period of time (T). A method for detecting a short circuit according to claim 4, wherein the frequency determination is performed by polynomial approximating the sine wave of the signal. A method for detecting a short circuit according to claim 1, further comprising storing signals representing a parameter (V) obtained during the storage period (T). 7. A method for detecting a short circuit according to claim 6, comprising transmitting stored values,