R
jx
Mho, zone3
Mho, zone2
Mho, zone1
IEC09000172_1_en.vsd
IEC09000172 V1 EN
Figure 67:
Mho, offset mho characteristic
Zone 3 can be equipped with a load encroachment function which cuts off a section of the
characteristic when enabled. The function is activated by setting the parameter
LoadEnchModZ3
to
Enable
. Enabling of the load encroachment function increases the
possibility to detect high resistive faults without interfering with the load impedance. The
algorithm for the load encroachment is located in the Load encroachment (LEPDIS)
function, where the relevant settings can be found. Information about load encroachment
from LEPDIS function to zone measurement is sent via the input signal LDCND in binary
format.
7.2.6.3
Basic operation characteristics
Each impedance zone can be enabled and disabled by setting
OpModeZx
(where
x
is 1-3
depending on selected zone).
The zone reach for phase-to-phase fault is set individually in polar coordinates. The
impedance is set by the parameter
ZxFwd
and
ZxRev
and the corresponding angles by the
parameter
ImpedanceAng
. The setting
ImpedanceAng
is common for all three zones.
1MRK 502 048-UUS A
Section 7
Impedance protection
163
Technical manual
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