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TRZ1
IEC11000297-3-en.vsd
<
<
<
BLOCK
BLKZ
U3P
I3P
STZ1
OpModeZ1
Z1Fwd
Z1Rev
Comparator
ZL1L2
OPModeZ1
Z1Fwd
Z1Rev
Comparator
ZL2L3
Comparator
ZL3L1
OpModeZ1
Z1Fwd
Z1Rev
1
³
ImpedanceAng
ImpedanceAng
ImpedanceAng
t
tZ1
IEC11000297 V3 EN
Figure 148:
Block diagram of zone 1
The functionality included in zone 1:
•
Comparator to detect, if the operating impedance has entered inside zone 1 offset
mho characteristic.
•
All three phase-to-phase loops are implemented separately.
•
Forward and reverse reach values are provided in percentage of impedance base
value at generator.
•
Operate time delay is provided.
Comparator characteristics
The comparator consists of offset mho characteristics. Three individual comparators
are provided in the three phase-to-phase loops. The offset mho characteristic is as
shown in figure
1MRK502052-UEN B
Section 7
Impedance protection
325
Technical manual
Содержание Relion REG670
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