Systems for detecting overloads and electrical differential protection equipment for electric lines

Abstract

The invention relates to an overload detection system (10) on an electrical line (N, P) comprising at least one conductor, said system (10) comprising: a measuring annulus (2), through which a shunt current can flow and can be A current shunt branch (4), an actuator (3) connected in parallel on said wire, said actuator (3) being controlled in response to an increase in current through said wire (N, P) so as to connecting a shunt branch (4) directly or indirectly to said wire in case of overload, characterized in that said shunt branch (4) and wire form a shunt ring when the actuator is activated in case of overload circuit, and in that the measuring annulus (2) is intended to detect directly or indirectly the shunt current of the shunt loop. The invention also relates to an electrical differential device (8) placed on electric lines (N, P) and characterized in that it comprises such a detection system (10).

Description

technical field [0001] The invention relates to a system for detecting overload on an electrical line comprising at least one conductor, said system comprising a measuring toroid, a current bypass branch capable of being passed by a bypass current and connected in parallel on the electrical line, responsive to The increase in current flowing through said wire is controlled to connect the bypass branch directly or indirectly to the actuator of the wire in case of overload. [0002] The invention also relates to a differential electrical device, such as a differential switch, a differential circuit breaker or a differential block, said device being placed on an electrical line. Background technique [0003] Such equipment must be able to disconnect the wires in the event of a fault such as a short circuit, differential fault or overload. To this end, they contain fixed and movable contacts, which can be separated at the onset of failure under the action of a mechanical trigge...

AI Technical Summary

Problems solved by technology

[0008] However, the thermal protection of this part is, on the one hand, sensitive to moisture aging due to the casing subject to creep, and on the other hand, to the external environment and especially to the presence of dust, which promotes seizure of the lock. )

As a result, the stroke and mechanical force required to activate the lock can vary, and in particular increase during the life of the lock, until the metal strip cannot secure the release of the lock, and thus lead to failure of the device in which the bimetallic strip is installed. Thermal protection does not work

Images