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Figure 133: Closed ring network topology where feeding lines are protected with
directional overcurrent protection relays
4.1.2.8
Signals
Table 263: FDPHLPDOC Input signals
Name
Type
Default
Description
I_A
SIGNAL
0
Phase A current
I_B
SIGNAL
0
Phase B current
I_C
SIGNAL
0
Phase C current
I
2
SIGNAL
0
Negative phase se-
quence current
U_A_AB
SIGNAL
0
Phase-to-earth volt-
age A or phase-to-
phase voltage AB
U_B_BC
SIGNAL
0
Phase-to-earth volt-
age B or phase-to-
phase voltage BC
U_C_CA
SIGNAL
0
Phase-to-earth volt-
age C or phase-to-
phase voltage CA
U
1
SIGNAL
0
Positive phase se-
quence voltage
Table continues on the next page
Protection functions
1MRS758755 C
252
REC615 & RER615
Technical Manual