ABB Relion 670 Series Technical Reference Manual page 412

Line differential protection ansi
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Section 7
Current protection
406
The protection has integrated directional feature. As the operating quantity current lop
is always used. The polarizinwcg method is determined by the parameter setting
polMethod. The polarizing quantity will be selected by the function in one of the
following three ways:
1.
When polMethod = Voltage, VPol will be used as polarizing quantity.
2.
When polMethod = Current, IPol will be used as polarizing quantity.
3.
WhenpolMethod = Dual, VPol + IPol · ZNPol will be used as polarizing quantity.
The operating and polarizing quantity are then used inside the directional element, as
shown in figure 207, in order to determine the direction of the ground fault.
Characteristic
for PUREV
-RCA +85 deg
RCA -85 deg
Characteristic for forward
release of measuring steps
ANSI11000243 V1 EN
Figure 207:
Operating characteristic for ground-fault directional element using the
zero sequence components
Two relevant setting parameters for directional supervision element are:
Operating area
PUREV
0.6 * INDirPU
Characteristic for reverse
release of measuring steps
40% of
INDirPU
RCA
65°
I
= 3I
op
Operating area
Characteristic
for PUFW
1MRK505222-UUS C
-RCA -85 deg
VPol = -3V
INDirPU
PUFW
0
ANSI11000243-1-en.ai
Technical reference manual
RCA +85 deg
0

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