ELECTRONIC TRIP DEVICE COMPRISING A CAPACITOR FOR SUPPLY OF A TRIP COIL

摘要

The trip device comprises a drive system including a power supply circuit of the trip coil power supply capacitors. When operating the trip unit, t ₁ - at t ₂ time, the capacitor is charged, if necessary, activate the trip coil to a first reference voltage sufficient to (19 according to the bolt), the voltage (V ₁ ) is adjusted. After a preset period (T), t ₂ - t in ₃ point, according to the first reference voltage is smaller than the second reference voltage (10 V), in the capacitor terminal and performs voltage regulation. At t ₃ of the measured time reaches a preset threshold current constituting the display is required the presence of a fault tripping the reference voltage for the same preset period of time goes back to the first value. Thus, in general, since the capacitor is charged at a voltage less than that necessary to the tripping, it is possible to reduce the size of the capacitor.