a) Z locus in under excitation for heavily loaded machine
b) Z locus in under excitation for lightly loaded machine
c) Z locus for a fault in the network
X (Reactance)
R (Resistance)
-X
Relay operation
characteristics
-R
a
b
c
GUID-C7940DC8-04A8-4FED-B089-DAA9B21D50DB V2 EN
Figure 349: Typical impedance locus in underexcitation: a) heavy load b) light load c)
fault in the network
4.7.2.6 Signals
Table 606: 40 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
1
SIGNAL 0 Positive sequence current
V_A_AB SIGNAL 0 Phase-to-ground voltage A or phase-to-phase voltage
AB
V_B_BC SIGNAL 0 Phase-to-ground voltage B or phase-to-phase voltage
BC
V_C_CA SIGNAL 0 Phase-to-ground voltage C or phase-to-phase voltage
CA
V
1
SIGNAL 0 Positive phase sequence voltage
BLOCK BOOLEAN 0=False Block signal for activating the blocking mode
EXT_LOS_DET BOOLEAN 0=False External signal for excitation loss detection
1MAC059074-MB A Section 4
Protection functions
615 series ANSI 703
Technical Manual
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