ABB RER620 Technical Manual page 91

1MAC309294-MB F
RER620
Technical Manual
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 36: 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
the operation timer has reached the value of Trip delay time in the DT mode or the
maximum value defined by the inverse time curve and the Time adder time has expired,
the TRIP output is activated.
Protection functions
input activated
ENA_MULT
Section 4
85