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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
, 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 38:
Operating characteristic for ground-fault directional element using the
zero sequence components
Section 6
1MRK 511 287-UUS A
Current protection
110
Technical manual
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