duration between the instant a specified change is made in the value(s) of the input energizing quantity(ies) that will cause the measuring relay or protection equipment in initial condition or reset condition to start (pick up) and the instant it starts (picks up) 
Figure 3 – Explanatory diagram for start condition (pick-up condition) 
Figure 4 – Relation between start time (pick-up time) and operate time Note 1 to entry: The relation between start time (pick-up time) and operate time is shown in Figure 4.
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