8
X1
Zm
Resistive reach with load encroachment characteristic
The procedure for calculating the settings for the load encroachment consist basically
to define the load angle LdAngle, the blinder RLdFwd in forward direction and blinder
RLdRev in reverse direction, as shown in figure 111.
R
X
RLdFwd
RLdRev
LdAngle
LdAngle
LdAngle
en05000226_ansi.vsd
LdAngle
ANSI05000226 V1 EN
Figure 111: Load encroachment characteristic
The load angle LdAngle is the same in forward and reverse direction, so it could be
suitable to begin to calculate the setting for that parameter. Set the parameter to the
maximum possible load angle at maximum active load. A value bigger than 20° must
be used.
The blinder in forward direction, RLdFwd, can be calculated according to equation
176.
= ×
2
min
0.8
exp max
RLdFwd
P
V
where:
P
exp max is the maximum exporting active power
V
min is the minimum voltage for which the Pexp max occurs
0.8 is a security factor to ensure that the setting of
RLdFwd
can be lesser than the calculated
minimal resistive load.
Section 3 1MRK504116-UUS C
IED application
258
Application manual
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