CIRCUIT BREAKERS TRANSIENT REDUCTION BY USING A DEDICATED CONTROLLED SWITCHING SYSTEM

The controlled switching can be applied to any type of commutations. Now there are dedicated controllers which are used more often for the switching of the transport and distribution lines, of the small inductive loads, of the capacitors batteries, or the energizing the no load power transformers. The paper presents a microcontroller (8051 family) based system used to controlled switching of various loads. This system has two main parts: the acquiring and transfer module and the user interface, developed using the facilities specific to Graphic User Interface of Matlab. The rate of decreasing of the dielectric stress and the mechanical dispersion of the switching on/off times qualifies the breakers to be able or not for controlled switching. The compensation of the waiting time is essential in order to obtain good performances, even for daily used breakers.