Protecting bus=bars using constant k with value greater than k equal to 2 outputs

摘要

The max (Ikmax) of the currents (Ik) is determined. The current curves (Ik) following the determination of the max Ik, are held at their max (Ikmax) during a determined holding time (th). The holding time (th) is computed according: to th = to - ta, with ta the time at which the max (Ikmax) occurs and corresp. to a max. holding duration, specified from the outside. The output current curves (Ik) are held during the holding time (th), to a value proportional to the corresp. max. The max. values (Ikmax) are multiplied with a factor: With ta the time when the max. value (Ikmax) occurs and To corresp. to the basic cycle of the mains frequency.