The
tP1
timer in figure
serve as detection of initial power swings, which are usually not
as fast as the later swings are. The
tP2
timer become activated for the detection of the
consecutive swings, if the measured impedance exit the operate area and returns within the
time delay, set on the
tW
waiting timer. The upper part of figure
(internal input signal
ZOUT_A, ZIN_A, AND-gates and tP-timers) are duplicated for phase B and C. All
tP1
and
tP2
timers in the figure have the same settings.
ANSI05000113-2-en.vsd
AND
ZINA
AND
DET-A
OR
AND
AND
ZOUTA
-loop
ZOUTB
ZOUTC
OR
detected
OR
-loop
0-tP1
0
0-tP2
0
0
0-tW
ANSI05000113 V2 EN
Figure 63:
Detection of power swing in phase A
1MRK 502 048-UUS A
Section 7
Impedance protection
157
Technical manual
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