Figure 147: Closed ring network topology where feeding lines are protected with
directional overcurrent protection relays
4.1.3.8 Signals
Table 276: DPHLPDOC 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
1MRS757644 H Protection functions
620 series
Technical Manual
289
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