Siemens Aktiengesellschaft

Matthias Kereit

Andreas Jurisch

Thomas Werner

Joerg Blumschein

Cezary Dzienis

Silvio Becher

Tevfik Sezi

Florian Büttner

Felix Buggenthin

Yilmaz Yelgin

Igor Kogan

Sigurd Spieckermann

Klaus Böhme

Waldemar Rebizant

Michael Claus

Andrzej Wiszniewski

Klaus Arzig

Marek Michalik

Volker Henn

Gustav Steynberg

Gunther Reichenbach

Florian BÜTTNER

Jörg Blumschein

Ingo Erkens

Miroslaw Lukowicz

Bruno Opitsch

Krzysztof Solak

Robert Westermann

Arnd STRÜCKER

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.

Method and apparatus for automatic localization of a fault

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.

Method and protective device for detecting a symmetrical short-circuit in a multiphase electrical power supply network

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. The fault signal is generated if a difference between rectified comparative voltage and rectified reference voltage values exceeds a triggering threshold value. A corresponding electrical protection device is provided.

Fast distance protection for energy supply networks

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. A fault location value is determined using the first current and voltage indicator measured values and the second current and voltage indicator measured values, indicating a fault location at which the ground short circuit has occurred in the segment of the electrical power supply line, and an adjustment value indicating a ground impedance is calculated using the fault location value. There is also provided a correspondingly equipped measurement device.

Method for determination of a setting value which indicates a ground impedance, and measurement device

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.

Method for producing a fault signal which indicates a short to ground

Process for producing signals identifying faulty loops in a polyphase

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Berlin, Germany

Matthias Kereit