Schneider Electric Industries Sas

Michel Hennequin

Emmanuel Dreina

Jean-Baptiste Bernard

Benoit Leprettre

Wedian Youssef

Nicolas Cochard

Eric Leger

Jonathan Caillou

Roland Bohrer

Stéphane Sicard

A method for diagnosing the cause of tripping of an electrical protection device includes, after detection by the auxiliary device of a loss of electrical power, determining a type of electrical fault on the basis of recorded values, the determining operation including: comparing, with a first threshold value, the largest value of the maximum intensity of the current from the recorded values for a plurality of measurement intervals preceding the loss of power, a short circuit being diagnosed if the largest value of the maximum intensity is greater than a first threshold value; comparing, with a second threshold value, the largest RMS value of the current from the recorded values, an overload being diagnosed if the largest RMS value is greater than a second threshold value.

Method for diagnosing the cause of tripping of an electrical protection device, auxiliary device and electrical system for implementing such a method

A method of radio communication in a system including a plurality of communicating modules, each communicating module being able to obtain at least one measured physical value and to transmit a message encapsulating at least one measured physical value to a hub device according to a given radio communication protocol, the sending of the message being performed during a communication time interval, defined by a start instant and an end instant, a waiting time separating two successive communication time intervals of one and the same communicating module. For each communicating module of the plurality of communicating modules, the waiting time is calculated as a function of an updated counter of the communicating module as a function of a receipt of an acknowledgement message originating from the hub device.

Method of radio communication in a system comprising a plurality of communicating modules

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Crolles, France

Michel Hennequin