ZONE 1
ZONE 2
OpModetZ3
Z3Fw
Z3Rev
tZ3
LoadEnchModZ3
ZONE 3
OpMode27pickup
27_COMP
timeDelay27
UVSealIn
V3P
I3P
BLKZ
BLOCK
BLOCKUV
27 Trip
TRZ3
PU_Z3
TRIP
TRZ2
PU_Z2
PICKUP
TRZ1
PU_Z1
OpModetZ2
Z2Fw
Z2Rev
tZ2
LoadEnchModZ2
OpModetZ1
Z1Fw
Z1Rev
tZ1
LoadEnch
RLd
LdAngle
27 PU
OR
ANSI11000295_2_en.vsd
OR
OR
ANSI11000295 V2 EN-US
Figure 236: Block diagram of ZGVPDIS
7.15.7.1 Operation principle of zone 1
GUID-994DD2FC-3B69-4ED6-AB94-A0C0D4399637 v3
In general, the zone 1 must cover the generator winding, the cables or busbars and step up
transformer.
Under impedance functionality is provided as selective protection for the phase-to-phase faults in
zone 1. Hence the functionality of zone 1 includes only phase-to-phase measuring loops.
Zone 1 functionality can be set to
PP Loops
or
Disabled
using the setting
OpModeZ1
.
Figure 237 shows the functionality of zone 1.
Section 7 1MRK 502 066-UUS B
Impedance protection
438
Technical manual
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