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