135
6
F
2
S
0
8
5
0
Z1
Z2
Z3
Z4
BFR1,2,3
BRR
Z1
Z2
Z3
Z4
BFR1,2,3
BRR
ZR
ZR
(
a) Phase fault element (b) Earth fault element
Figure 2.16.3.2 Quadrilateral Four Zone Characteristics
(a) Mho-based characteristic
R
X
ZRS
Z1S
(b) Quadrilateral characteristic
R
X
Z1S
ZRS
Figure 2.16.3.3 ZRS Characteristic Offset Reach for Backup Tripping
Zone 1 and zone 2 can trip on condition that zone 3 has operated, in both characteristics.
The power swing blocking elements (PSBS and PSBG) are a combination of the reactance element
and blinder element as shown in Figure 2.16.3.4. The outer element PSBOUT encloses the inner
element PSBIN with a settable width of PSBZ.
PSBZ
PSBZ
PSBZ
0
PSBZ
PSBIN
PSBOUT
R
X
Z3
Z4
ZR
Figure 2.16.3.4 Power Swing Blocking Element
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Summary of Contents for GRL100-701B
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