The resistive boundary RLdRev for load encroachment characteristic in reverse
direction can be calculated in the same way as RLdFwd, but use maximum importing
power that might occur instead of maximum exporting power and the relevant Vmin
voltage for this condition.
Minimum operate currents
FDPSPDIS (21) has two current setting parameters which blocks the respective phase-
to-ground loop and phase-to-phase loop if the RMS value of the phase current (ILn)
and phase difference current (ILmILn) is below the settable threshold.
The threshold to activate the phase selector for phase-to-ground (IMinPUPG) is set to
securely detect a single phase-to-ground fault at the furthest reach of the phase
selection. It is recommended to set IMinPUPP to double value of IMinPUPG.
The threshold for opening the measuring loop for phase-to-ground fault
(3I0Enable_PG) is set securely detect single line-to-ground fault at remote end on the
protected line. It is recommended to set 3I0BLK_PP to double value of 3I0Enable_PG.
3.6.3.4 Setting parameters
Table 56: FDPSPDIS (21) Group settings (basic)
Name
Values (Range) Unit Step Default Description
IBase 1 - 99999 A 1 3000 Base current, i.e. rated current
VBase 0.05 - 2000.00 kV 0.01 400.00 Base voltage, i.e. rated voltage
3I0BLK_PP 10 - 100 %IPh 1 40 3I0 limit for disabling phase-to-phase
measuring loops
3I0Enable_PG 10 - 100 %IPh 1 20 3I0 pickup for releasing phase-to-ground
measuring loops
RLdFwd 1.00 - 3000.00 ohm/p 0.01 80.00 Forward resistive reach for the load
impedance area
RldRev 1.00 - 3000.00 ohm/p 0.01 80.00 Reverse resistive reach for the load
impedance area
LdAngle 5 - 70 Deg 1 30 Load angle determining the load impedance
area
X1 0.50 - 3000.00 ohm/p 0.01 40.00 Positive sequence reactance reach
X0 0.50 - 9000.00 ohm/p 0.01 120.00 Zero sequence reactance reach
RFltFwdPP 0.50 - 3000.00 ohm/l 0.01 30.00 Fault resistance reach, Ph-Ph, forward
RFltRevPP 0.50 - 3000.00 ohm/l 0.01 30.00 Fault resistance reach, Ph-Ph, reverse
RFltFwdPG 1.00 - 9000.00 ohm/l 0.01 100.00 Fault resistance reach, Ph-G, forward
RFltRevPG 1.00 - 9000.00 ohm/l 0.01 100.00 Fault resistance reach, Ph-G, reverse
IMinPUPP 5 - 500 %IB 1 10 Minimum pickup delta current (2 x current of
lagging phase) for Phase-to-phase loops
IMinPUPG 5 - 500 %IB 1 5 Minimum pickup phase current for Phase-to-
ground loops
1MRK504116-UUS C Section 3
IED application
259
Application manual
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