ABB REG670 - Operation Principle of Zone 1

ZONE 1
ZONE 2
OpModeZ3
Z3Fwd
Z3Rev
tZ3
LoadEnchModZ3
ZONE 3
OpModeU<
U<
tU<
UVSealIn
³
³
U3P
I3P
BLKZ
BLOCK
BLCKUV
TRUV
TRZ3
STZ3
OPERATE
TRZ2
STZ2
START
TRZ1
STZ1
OpModeZ2
Z2Fwd
Z2Rev
tZ2
LoadEnchModZ2
OpModeZ1
Z1Fwd
Z1Rev
tZ1
LoadEnch
RLd
ArgLd
STUV
1
1
IEC11000295-3-en.vsd
³1
IEC11000295 V2 EN
Figure 147: Block diagram of ZGVPDIS
7.10.7.1 Operation principle of zone 1
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 Off using the setting OpModeZ1.
Figure 148 shows the functionality of zone 1.
Section 7 1MRK502052-UEN B
Impedance protection
324
Technical manual