摘要:
A circuit interrupter includes a circuit arrangement for sampling [Fig. 12 (79, 82)] a conditioned current value and determining operating characteristics [Fig. 3 (100)] related to the current flow through an electrical circuit [Fig. 3 (71)]. Also included is a circuit arrangement for comparing [Fig. 16 (F200)] the operating characteristics to preselectable tripping parameters and for initiating a trip condition [Fig. 16 (F400)] when an operating characteristic exceeds a corresponding tripping parameter. Additionally, a circuit arrangement for selecting and displaying [Fig. 16 (F600)] operating information in an understandable format [Fig. 6 (120)] and in an easily accessible position [Fig. 5 (120)] on the circuit interrupter is also included.
摘要:
Dispositif pour la commande d'un cycle comprenant au moins une phase de déclenchement et au moins une phase de réenclenchement d'un disjoncteur muni de sources d'énergie permettant d'effectuer successivement de manœuvres d'ouverture et de fermeture, l'énergie de ces sources étant libérable par action d'organes munis chacun d'une bobine d'actionnement, caractérisé en ce que chaque bobine d'actionnement (B1, B2) est disposée dans un circuit comprenant un condensateur (C1, C2) et un interrupteur commandable (11, 12), le dispositif comportant en outre un circuit de charge des condensateurs à partir des courants de défauts et un relais de surintensité (R) élaborant des signaux séquentiels de commande des interrupteurs. Application à la protection des réseaux électriques.
摘要:
A motor starter (4) includes a contactor (6) and an overload relay (8). The overload relay includes a power supply (10) having a voltage (12;64), a processor (14) powered by the power supply voltage and being structured to control the contactor, and an overvoltage circuit (16;50). The overvoltage circuit includes a voltage reference (52) having a voltage (54), a comparator (56), a load (60) and a switch (58). The comparator includes a first input (62) for the power supply voltage, the first input cooperating with the voltage of the voltage reference to determine a threshold voltage, a second input (65) for voltage reference voltage, and an output (60). The switch is controlled by the comparator output and is structured to electrically connect the power supply voltage to ground (68) through the load whenever the power supply voltage exceeds the threshold voltage.
摘要:
The invention relates to an arrangement for protecting systems and individuals, comprising a switching element which can be triggered by the detection of a fault arc. According to the invention, the electric energy for triggering the switching element results exclusively from the energy of the occurring fault arc.