ABB Relion 670 series, Technical Reference Manual

Page: 412 / 1232

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. When polMethod = 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.
PUREV
0.6 * INDirPU
PUFW
-RCA -85 deg
40% of
INDirPU
INDirPU
RCA
65°
VPol = -3V
0
I = 3I
op 0
RCA +85 deg
RCA -85 deg
Characteristic
for PUREV
Characteristic
for PUFW
Characteristic for reverse
release of measuring steps
Characteristic for forward
release of measuring steps
-RCA +85 deg
ANSI11000243-1-en.ai
Operating area
Operating area
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:
Section 7
1MRK505222-UUS C
Current protection
406
Technical reference manual