DSTPDIS has five flexible configurable impedance zones for protection (Z1...Z5).
Phase-to-earth distance protection is a basic earth-fault protection in solidly or
low-impedance earthed networks. Together with the phase preference logic, it
also serves as a selective protection function at cross-country faults in isolated
or Petersen coil compensated networks. In certain applications, system earthing is
changed during operation from high-impedance to low-impedance earthed system
due to fault location procedures. DSTPDIS can be used in such applications by
setting System grounding GFC to "From input" and by providing information
about the type of earthing through binary input SYS_EARTHING. Low (inactive)
SYS_EARTHING input indicates low-impedance earthing system.
DSTPDIS is suitable as a basic protection function against two- and three-phase
faults in various networks, regardless of the treatment of the neutral point. The
independent setting of the reach in the reactive and the resistive directions makes it
possible to create a fast and selective short circuit protection in many applications.
4.7.1.8 Signals
DSTPDIS Input signals
Table 926: DSTPDIS Input signals
Name Type Default Description
I3P SIGNAL - Three-phase currents
I3P_PAR SIGNAL - Three-phase currents
I3P_REF SIGNAL - Three-phase currents
U3P SIGNAL - Three-phase voltages
URES SIGNAL - Residual voltage
BLOCK BOOLEAN 0=False Block signal for acti-
vating the blocking
mode
SYS_EARTHING BOOLEAN 0=False Network earthing
method
TRIGG_REC BOOLEAN 0=False External triggering
for all recorded data
BLOCK_GFC BOOLEAN 0=False Block GFC operate
BLOCK_Z1 BOOLEAN 0=False Block zone 1
BLOCK_Z2 BOOLEAN 0=False Block zone 2
BLOCK_Z3 BOOLEAN 0=False Block zone 3
BLOCK_Z4 BOOLEAN 0=False Block zone 4
BLOCK_Z5 BOOLEAN 0=False Block zone 5
Protection functions 1MRS759142 F
984 REX640
Technical Manual
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