ABB REL650 - Load Encroachment

max
3
S
ILoad
VLmn
=
×
EQUATION1615-ANSI V1 EN (Equation 67)
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.
6.3.3.1 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 70).
R
X
RLdFw
RLdRv
LdAngle
LdAngle
LdAngle
ANSI10000192_1_en.vsd
LdAngle
ANSI10000192 V1 EN
Figure 70: Load encroachment characteristic
min
max
3 I
V
Zload =
×
EQUATION1754-ANSI V1 EN (Equation 68)
Section 6 1MRK 506 334-UUS A
Impedance protection
148
Application manual