Signals - ABB RELION REX640 Technical Manual

Section 4
Protection functions
4.1.2.9
342
grading between the network level stages is challenging without unnecessary delays
in the time settings. In this case, it is practical to use the directional overcurrent
protection relays to achieve a selective protection scheme. Directional overcurrent
functions can be used in closed ring applications. The arrows define the operating
direction of the directional functionality. The double arrows define the non-
directional functionality where faults can be detected in both directions.
GUID-AC3F71F6-583A-466C-81EB-99E4F9EBA3E8 V1 EN
Figure 196: Closed ring network topology where feeding lines are protected with
directional overcurrent protection relays

Signals

Table 373: DPHLPDOC Input signals
Name Type
I3P SIGNAL
U3P SIGNAL
BLOCK BOOLEAN
ENA_MULT BOOLEAN
NON_DIR BOOLEAN
Default Description
- Three-phase currents
- Three-phase voltages
0=False Block signal for activating the blocking mode
0=False Enable signal for current multiplier
0=False Forces protection to non-directional
1MRS759142 C
REX640
Technical Manual