ABB RELION REX640 Technical Manual page 579

1MRS759142 C
REX640
Technical Manual
binary outputs are blocked. When the function is blocked, the direct inter-trip is also
blocked.
The PRO_ACTIVE output is always active when the protection function is capable of
operating. PRO_ACTIVE can be used as a blocking signal for backup protection
functions.
Timer
Once activated, the timer activates the STR_LS_LOC output. Depending on the value
of the set Operating curve type, the timer characteristics are according to DT or IDMT.
When the operation timer has reached the value set with the Operate delay time in the
DT mode or the maximum value defined by the inverse time curve, the OPR_LS_LOC
output is activated. When the operation mode is according to IDMT, Low operate
value is used as reference value (Start value) in the IDMT equations presented in the
Standard inverse-time characteristics section.
A timer reset state is activated when a drop-off situation happens. The reset is done
according to the DT characteristics.
For a detailed description of the timer characteristics, see the
function block features
Instantaneous high stage
In addition to the stabilized low stage, LNPLDF has an instantaneous high stage. The
stabilizing is not done with the instantaneous high stage. The instantaneous high stage
operates immediately when the differential current amplitude is higher than the set
value of the High operate value setting. If the ENA_MULT_HS input is active, the
High operate value setting is internally multiplied by the High Op value Mult setting.
GUID-A1B9F000-8925-475A-8E3F-21F4F66FF517 V1 EN
Figure 314: Operation logic of instantaneous high stage
Direct inter-trip
Direct inter-trip is used to ensure the simultaneous opening of the circuit breakers at
both ends of the protected line when a fault is detected. Both start and operate signals
Protection functions
section in this manual.
Section 4
General
573