Abstract:
Disclosed herein is a method for circuit breaker failure (CBF) protection in a power substation. The method detects the failure of circuit breakers (CBs) that are associated with a power plant connected to a power network via the powered substation. If the voltage or the current of the feeder of the power plant exceeds a given threshold and remains higher than the threshold for a given period of time, the method sends tripping commands to the CBs in two stages. At a first stage of the two stages, tripping commands are sent to a first group of CBs that are directly connected to the feeder of the power plant. If the voltage or the current remains high after sending the first stage tripping commands, second-stage tripping commands are sent to a second group of CBs that are connected to the first group of CBs.
Abstract:
A portable electrical energy power node is provided. The power node includes first and second input power terminals and first and second output power terminals. The input power terminals are adapted for receiving a source of electrical power and the output terminals are adopted for connecting to a load. A first power line connects the first input terminal to the first output terminal, a second power line connects the second input terminal to the input side of a circuit interrupter and a third power line connects the output side of the circuit interrupter to the second output terminal. The circuit interrupter selectively interrupts the connection between the second input terminal and the second output terminal in accordance with a fault sensor and a control unit.
Abstract:
A circuit interrupter (10,10') includes a first terminal (11) structured to electrically connect to a power source (12), a second terminal (13) structured to electrically connect to a load (14), separable contacts (16) electrically connected between the first terminal and the second terminal and being moveable between a closed position and an open position, an operating mechanism (18) structured to trip open the separable contacts, an electronic trip unit (20,20') structured to detect a fault condition based on power flowing between the first and second terminals and to retrieve diagnostic or setting information associated with the circuit interrupter, and a wireless unit (22,22') structured to provide the setting or diagnostic information associated with the circuit interrupter to an external device via a wireless communication protocol.
Abstract:
A method (100) for determining the operating status a MV switching apparatus (1), which comprises: - one or more electric poles, each comprising a movable contact (11) and a fixed contact (12) adapted to be coupled or uncoupled during the switching operations of said switching apparatus; an electromagnetic actuator (13) for actuating one or more movable contacts of the electric poles, said electromagnetic actuator having at least a test winding (132, 134, 136) wound around a magnetic element; - a capacitor bank (15) for providing electric power to said electromagnetic actuator; The method comprises the following steps: - providing a test signal (ST) to said test winding for an observation period of time (T O ), said test signal having a waveform capable of exciting said magnetic element; - obtaining first measuring data (V C ) indicative of a voltage at first terminals (T1) of said capacitor bank during said observation period of time; - obtaining second measuring data (V L , I L ) indicative of a voltage at second terminals (T2) of said test winding and indicative of a current circulating along said test winding during said observation period of time; - calculating estimation data (Ĉ, I CD , I C ) indicative of the operating status of said capacitor bank at the end of said observation period of time on the base of said first and second measuring data, said first estimation data comprising a first estimation value (Ĉ) indicative of the capacitance of said capacitor bank.
Abstract:
Die vorliegende Erfindung betrifft eine Anordnung mit einem Betriebsmittel (1), insbesondere für ein Verteilungs- und Übertragungsnetz, sowie mit einer Schutz-und/oder Steuerungseinheit (2), die an das Betriebsmittel (1) angeschlossen ist, wobei in Reihe zwischen der Schutz- und/oder Steuerungseinheit (2) und dem Betriebsmittel (1) eine Anschlussvorrichtung (32) angeordnet ist, so dass die Schutz- und/oder Steuerungseinheit (2) im Betriebszustand elektrisch mit dem Betriebsmittel (1) verbunden ist, wobei in einem Prüfzustand eine Prüfvorrichtung (31) in die Anschlussvorrichtung (32) eingesteckt ist, so dass die Schutz- und/oder Steuerungseinheit (2) im Prüfzustand elektrisch vom Betriebsmittel (1) getrennt ist, und wobei im Prüfzustand an die Prüfvorrichtung (31) eine Ersatz-Schutz- und/ oder Steuerungseinheit (2') angeschlossen oder in die Prüfvorrichtung (31) integriert ist, die elektrisch mit dem Betriebsmittel (1) verbunden ist. Die vorliegende Erfindung betrifft zudem eine Prüfvorrichtung (31) für eine solche Anordnung, sowie ein Verfahren zum Prüfen einer Schutz- und/oder Steuerungseinheit (2) einer solchen Anordnung.
Abstract:
The invention relates to a fault detection method and system in an Electronic Trip Unit (ETU). An ETU includes a Protection Function (PF) and a Metering Function (MF), each of the PF and MF measuring in parallel the same one or more power line parameters. A comparator compares the first measurement and the second measurement and outputs a fault signal when a disagreement is detected with a given level of accuracy between the first measurement and the second measurement. At least one further comparator may be used that compares the first measurement and the second measurement, and a voter circuit that collects signals resulting from each said comparing and detects a fault when at least one fault signal exists among said collected signals.
Abstract:
L'invention concerne un dispositif de traitement de signal comportant des premiers moyens d'entrée (37) destinés à être connectés via un capteur (19) de mesure à un signal de haute tension d'une installation électrique, et des moyens de traitement (33) destinés à analyser le signal mesuré par ledit capteur, le dispositif comportant en outre : - des moyens de basculement (41) configurés pour faire basculer le fonctionnement du dispositif entre un mode test dans lequel le dispositif est déconnecté dudit signal de haute tension pour être connecté à un signal de test et un mode opératoire dans lequel le dispositif est déconnecté dudit signal de test pour être reconnecté audit signal de haute tension, et - des seconds moyens d'entrée (39) connectés auxdits moyens de traitement (33), lesdits moyens de traitement étant configurés pour actionner lesdits moyens de basculement (41) de telle sorte que le dispositif fonctionne en mode test ou en mode opératoire selon que les seconds moyens d'entrée sont activés ou désactivés respectivement.
Abstract:
A circuit interrupter (2) for a power circuit (4) includes separable contacts (10), an operating mechanism (12) structured to open and close the separable contacts, and a trip circuit (14) cooperating with the operating mechanism to trip open the separable contacts. The trip circuit includes a number of hardware circuits (16,18,20,22,24,26,28,30,32,34) having a processor (34) with a number of routines (38,40,42). The routines provide a number of protective functions (38) structured (40) to detect a number of faults of the power circuit, a number of repetitive test functions for the number of hardware circuits, and a supervisory function (42) cooperating with the number of repetitive test functions. The supervisory function is structured to prevent availability of protection by the number of protective functions from falling below a predetermined threshold as a result of a plurality of intermittent error conditions of the number of hardware circuits.
Abstract:
Circuit interrupting devices are provided. One circuit interrupting device includes a fault sensor configured to output a sensor signal; a voltage sensor configured to sense a reference voltage; and a controller configured to determine an occurrence of an actual fault based on the sensor signal and the reference voltage. The circuit interrupting device further includes an amplifier configured to receive the sensor signal and the reference voltage and output an amplified signal; an analog-to-digital converter configured to receive the reference voltage and the amplified signal and output respective digital signals corresponding to the reference voltage and the amplified signal; and a line interrupt assembly configured to interrupt current flow through a conductive path when a characteristic of the sensor signal exceeds an actual fault threshold.