Abstract: Provided is an in-field apparatus and method for automatic localization of a fault having occurred at power transmission lines of a power supply system, the in-field apparatus includes a preprocessing unit configured to process measured voltage and/or current raw time series data of the power transmission lines to provide a normalized raw data and/or feature representation of the measured raw time series data, and an artificial intelligence module configured to predict an optimal evaluation time used for evaluation of the measured voltage and/or current raw time series data to localize the fault based on the normalized raw data and/or feature representation.

Abstract: Provided is an in-field apparatus and method for automatic localization of a fault having occurred at power transmission lines of a power supply system, the in-field apparatus includes a preprocessing unit configured to process measured voltage and/or current raw time series data of the power transmission lines to provide a normalized raw data and/or feature representation of the measured raw time series data, and an artificial intelligence module configured to predict an optimal evaluation time used for evaluation of the measured voltage and/or current raw time series data to localize the fault based on the normalized raw data and/or feature representation.

Abstract: A first protective device monitors a first section of a power supply network for a symmetrical short-circuit and a second protective device monitors a second section for a symmetrical short-circuit. The second protective device is a reserve protective device, which emits a shut-off command to a power switch after a time lag when a symmetrical short-circuit in the first section is recognized. An oscillation recognition unit emits an oscillating signal which blocks the shutoff command if an oscillation in the power supply network has been recognized. External symmetrical short-circuits can be disconnected independently of an occurring oscillation, when the second protective device has recognized a symmetrical short-circuit in the first section, before the oscillation recognition unit recognizes an oscillation in the power supply network, the shut-off command is emitted independently of the presence of an oscillating signal if the lag time has elapsed.

Abstract: A method for detecting a short circuit on a multiphase electrical energy supply network line includes recording current and voltage sampled values and generating a fault signal upon a fault evaluation performed by an electrical protection device indicating a short circuit. Instantaneous reference voltage values are calculated from instantaneous current and voltage sampled values recorded before the short, and instantaneous comparative voltage values are calculated from instantaneous current and voltage sampled values recorded before the short and instantaneous current and voltage sampled values recorded during the short, to generate a fault signal quickly. Then a rectified reference voltage value is calculated from consecutive instantaneous reference voltage values, and a rectified comparative voltage value is calculated from consecutive instantaneous comparative voltage values.

Abstract: A first protective device monitors a first section of a power supply network for a symmetrical short-circuit and a second protective device monitors a second section for a symmetrical short-circuit. The second protective device is a reserve protective device, which emits a shut-off command to a power switch after a time lag when a symmetrical short-circuit in the first section is recognized. An oscillation recognition unit emits an oscillating signal which blocks the shutoff command if an oscillation in the power supply network has been recognized. External symmetrical short-circuits can be disconnected independently of an occurring oscillation, when the second protective device has recognized a symmetrical short-circuit in the first section, before the oscillation recognition unit recognizes an oscillation in the power supply network, the shut-off command is emitted independently of the presence of an oscillating signal if the lag time has elapsed.

Abstract: A method and a protective device for monitoring a power supply line supplied at one end in a three-phase electrical power supply system with regard to the presence of a ground fault. The power supply line is connected, at the end thereof remote from the supply, to a transformer operated in a star-delta connection. When a coupling effect according to Bauch's paradox occurs, the ground fault is reliably and selectively disconnected by determining the phase currents in the individual phase conductors of the power supply line and the zero phase sequence system current at a measuring point which is at that end of the power supply line remote from the supply. A suspected ground fault signal is generated if the individual phase currents and the zero phase sequence system current are substantially of the same magnitude and are in phase. The suspected ground fault signal is used during further monitoring with regard to the presence of the ground fault.

Abstract: A method for detecting a short circuit on a multiphase electrical energy supply network line includes recording current and voltage sampled values and generating a fault signal upon a fault evaluation performed by an electrical protection device indicating a short circuit. Instantaneous reference voltage values are calculated from instantaneous current and voltage sampled values recorded before the short, and instantaneous comparative voltage values are calculated from instantaneous current and voltage sampled values recorded before the short and instantaneous current and voltage sampled values recorded during the short, to generate a fault signal quickly. Then a rectified reference voltage value is calculated from consecutive instantaneous reference voltage values, and a rectified comparative voltage value is calculated from consecutive instantaneous comparative voltage values.

Abstract: A method for determining an adjustment value for an electrical protection device wherein, upon occurrence of a ground short circuit, first current indicator measured values and first voltage indicator measured values are captured by a first measurement device at a first end of a segment of an electrical power supply line, and second current indicator measured values and second voltage indicator measured values are captured by a second measurement device at a second end of the segment of an electrical power supply line. In order to design a method of this type such that an adjustment value for a ground impedance can be determined in a relatively simple fashion.

Abstract: A method for determining an adjustment value for an electrical protection device wherein, upon occurrence of a ground short circuit, first current indicator measured values and first voltage indicator measured values are captured by a first measurement device at a first end of a segment of an electrical power supply line, and second current indicator measured values and second voltage indicator measured values are captured by a second measurement device at a second end of the segment of an electrical power supply line. In order to design a method of this type such that an adjustment value for a ground impedance can be determined in a relatively simple fashion.

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.

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.

Abstract: A method for producing signals indicating faulty loops in a polyphase electrical power supply network using impedance excitation, in which, after checking for ground faults, by comparing the amounts of the impedance values obtained during the impedance excitation, the signals indicating the faulty loops are formed. In order to eliminate with great certainty all the loops that are actually not faulty, in spite of initial excitation, in ascertaining loops which are exclusively free of ground faults, the actually faulty loops are determined by comparing calculated, virtual impedances, to impedances measured during the impedance excitation; in ascertaining at least one loop having ground faults, fault-free phase-to-ground loops are recognized and eliminated by comparing the amounts of the virtual impedance values, formed with respect to the phase-to-ground loops detected as faulty, to the smallest virtual impedance value, and fault-free phase-to-ground loops are recognized and eliminated.