ANSI05000283 V1 EN
Figure 227: Impedance diagrams with corresponding impedances under
consideration
The outer boundary of oscillation detection characteristic in forward direction RLdOutFw
should be set with certain safety margin K
L
compared to the minimum expected load
resistance R
Lmin
. When the exact value of the minimum load resistance is not known, the
following approximations may be considered for lines with rated voltage 400 kV:
Section 8 1MRK 506 369-UUS -
Impedance protection
440 Line distance protection REL670 2.2 ANSI
Application manual
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