EQUATION1615-ANSI V1 EN (Equation 226)
where:
Smax is the maximal apparent power transfer during emergency conditions and
VLmn is the phase-to-phase voltage during the emergency conditions at the IED location.
8.8.3.1 Load encroachment
The load encroachment function has two setting parameters, RLd for the load resistance
and LdAngle for the inclination of the load sector (see figure 147).
R
X
RLdFw
RLdRv
LdAngle
LdAngle
LdAngle
ANSI10000192_1_en.vsd
LdAngle
ANSI10000192 V1 EN
Figure 147: Load encroachment characteristic
The calculation of the apparent load impedance Z
load
and minimum load impedance
Z
loadmin
can be done according to equations:
EQUATION1754-ANSI V1 EN (Equation 227)
1MRK 506 369-UUS - Section 8
Impedance protection
Line distance protection REL670 2.2 ANSI 307
Application manual
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