ABB RELION REX640 Technical Manual page 1113

Protection and control

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1MRS759142 F

Figure 625: Inverse-time characteristic curves for overload stage

If the integrated current exceeds 1.1 times the setting

short period but does not operate as the current decreases within

overload , the output ST_OVLOD is kept active but the operation timer is frozen.

However, if the integrated current exceeds 1.1 times the

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 only once and remains within the Start value overload area for

24 hours, the operation timer and the output ST_OVLOD are reset.

Technical Manual

Protection functions

Start value overload for a

Start value overload