ABB RELION REX640 Technical Manual page 1020

Section 4
Protection functions
1014
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Figure 549: Inverse-time characteristic curves for overload stage
If the integrated current exceeds 1.1 times the setting Start value overload for a short
period but does not operate as the current decreases within Start value overload, the
output ST_OVLOD is kept active but the operation timer is frozen. However, if the
integrated current exceeds 1.1 times the Start value overload setting value again, the
operation timer continue from the freezing point. Thus, the operation timer is
cumulative. If the integrated current exceeds 1.1 times the setting Start value overload
1MRS759142 C
REX640
Technical Manual