•
setting
RCADir
to value
+65 degrees
, that is, the negative sequence current typically
lags the inverted negative sequence voltage for this angle during the fault
•
setting
ROADir
to value
90 degrees
•
setting
LowVolt_VM
to value
2%
, that is, the negative sequence voltage level above
which the directional element will be enabled
•
setting
Operation_OC1
to
Enabled
•
setting
PickupCurr_OC1
to value between
3-10%
, (typical values)
•
setting
tDef_OC1
to insure proper time coordination with other ground-fault
protections installed in the vicinity of this power line
•
setting
DirMode_OC1
to
Forward
•
setting
DirPrinc_OC1
to
IcosPhi&V
•
setting
ActLowVolt1_VM
to
Block
DNSPTOC (46) is used in directional comparison protection scheme for the power line
protection, when communication channels to the remote end of this power line are
available. In that case, two negative sequence overcurrent steps are required - one in
forward and another in reverse direction. The OC1 stage is used to detect faults in forward
direction and the OC2 stage is used to detect faults in reverse direction.
However, the following must be noted for such application:
•
setting
RCADir
and
ROADir
are applicable for both steps OC1 and OC2
•
setting
DirMode_OC1
must be set to
Forward
•
setting
DirMode_OC2
must be set to
Reverse
•
setting
PickupCurr_OC2
must be made more sensitive than
pickup
value of the
forward OC1 element, that is, typically 60% of
PickupCurr_OC1
set pickup level in
order to insure proper operation of the directional comparison scheme during current
reversal situations
•
the start signals PU_OC1 and PU_OC2 from OC1 and OC2 elements is used to send
forward and reverse signals to the remote end of the power line
•
the available scheme communications function block within IED is used between the
protection function and the teleprotection communication equipment, in order to
insure proper conditioning of the above two start signals.
ActLowVolt1
and
ActLowVolt2
should not be set to
Memory
.
Section 6
1MRK 511 286-UUS A
Current protection
150
Application manual
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