ABB RELION 620 Series Technical Manual page 174

Section 4
Protection functions
168
the value to the phase selection logic. If the ENA_MULT input is active, the Pickup value
setting is multiplied by the Pickup value Mult setting.
Do not set the multiplier setting Pickup value Mult higher than necessary.
If the value is too high, the function may not trip at all during an inrush
followed by a fault, no matter how severe the fault is.
The pickup value multiplication is normally done when the inrush detection function
(INR) is connected to the ENA_MULT input.
GUID-640654EC-1E77-4ED5-BE41-9EC399B686BA-ANSI V1 EN
Figure 73: Pickup value behavior with ENA_MULT input activated
Phase selection logic
If the fault criteria are fulfilled in the level detector and the directional calculation, the
phase selection logic detects the phase or phases in which the measured current exceeds
the setting. If the phase information matches the Num of pickup phases setting, the phase
selection logic activates the timer module.
Timer
Once activated, the timer activates the PICKUP output. Depending on the value of the
Operating curve type setting, the time characteristics are according to DT or IDMT. When
1MAC504801-IB E
620 series ANSI
Technical Manual