The triggering of 21FL can also be inhibited during the autoreclosing sequence. This is
achieved by connecting the inverted READY signal from the autoreclosing function 79,
which indicates that the autoreclosing sequence is in progress, to the BLOCK input of
21FL. Blocking of the 21FL triggering is suggested during the autoreclosing sequence
when the load compensation or steady-state asymmetry elimination is based on the delta
quantities. This applies to the short circuit faults when Load Com PP loops is set to
“Enabled” or, for ground faults, when EF algorithm Sel is set to “Load compensation” or
“Load modelling”.
5.7.6 Signals
Table 717: 21FL 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
Io SIGNAL 0 Residual current
I
1
SIGNAL 0 Positive sequence current
I
2
SIGNAL 0 Negative 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
0
SIGNAL 0 Residual voltage
V
1
SIGNAL 0 Positive phase sequence voltage
V
2
SIGNAL 0 Negative phase sequence voltage
BLOCK BOOLEAN 0=False Signal for blocking the triggering
TRIGG BOOLEAN 0=False Distance calculation triggering signal
TRIGG_XC0F BOOLEAN 0=False XC0F calculation triggering signal
Table 718: 21FL Output signals
Name
Type Description
ALARM BOOLEAN Fault location alarm signal
Section 5 1MAC059074-MB A
Protection related functions
826 615 series ANSI
Technical Manual
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