Whole selectivity and partial selectivity are given in Half 2 of the Normal IEC 60947-2 “Low voltag
What you’ll be taught
Selectivity Examine
Forms of Selectivity
Partial vs Full Selectivity
Whole vs enhanced Selectivity
Time, present, logic or zone and power selectivity
LSIG Curves
Why take this course?
What’s “selectivity”?
Full selectivity implies that the protecting units will reduce impact of a brief circuit or different undesirable occasion on the ability system. The quantity of the ability system that have to be shut down in response to the occasion is stored to absolutely the minimal.
The definitions of whole selectivity and partial selectivity are given in Half 2 of the Normal IEC 60947-2 “Low voltage Tools – Half 2: Circuit-breakers”.
“Whole selectivity (2.17.2): Overcurrent selectivity the place, within the presence of two safety units in opposition to overcurrent in sequence, the loadside safety system carries out the safety with out making the opposite system journey.”
“Partial selectivity (2.17.3): Overcurrent selectivity the place, within the presence of two safety units in opposition to overcurrent in sequence, the loadside safety system carries out the safety as much as a given stage of overcurrent, with out making the opposite system journey.”
Overload zone
By which the thermal safety for thermal-magnetic journey items and safety L for digital journey items are usually referred to as upon to journey.
Quick-circuit zone
By which the magnetic safety for thermal-magnetic journey items or protections S, D and I for solid-state journey items are usually referred to as upon to journey.
The completely different selectivity methods, additionally from the operational viewpoint
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