ABB RER620 Technical Manual page 110

Section 4
Protection functions
104
The relay does not accept the Pickup value or Pickup value Mult setting if
the product of these settings exceeds the Pickup value setting range.
The Pickup block value is not affected by the ENA_MULT input or the
Pickup value Mult setting.
The pickup value multiplication is normally done when the inrush detection function
(INR) is connected to the ENA_MULT input.
Figure 43: Pickup value behavior with
Phase selection logic
This logic is only active in three-phase tripping mode. If the fault criteria are fulfilled in
the level detector, 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.
When in single-phase tripping mode, the Num of pickup phases setting has no affect on
operation and the outputs of the level detector are passed directly to the corresponding
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
input activated
ENA_MULT
1MAC309294-MB F
RER620
Technical Manual