Basic Detection Logic - ABB RES670 Technical Manual

1MRK 511 408-UUS A
7.1.6.4
Phasor measurement unit RES670 2.2 ANSI
Technical manual

Basic detection logic

The operation of the Power swing detection ZMRPSB (68) is only released if the
magnitude of the current is above the setting of the min operating current, IMinPUPG.
ZMRPSB (68) function can operate in two operating modes:
• The 1 out of 3 operating mode is based on detection of power swing in any of the
three phases. Figure
DET-A in this particular phase.
• The 2 out of 3 operating mode is based on detection of power swing in at least two
out of three phases. Figure
DET1of3 and DET2of3.
Signals ZOUT_n (outer boundary) and ZIN_n (inner boundary) in figure
to the operation of the impedance measuring elements in each phase separately (n
represents the corresponding A, B and C). They are internal signals, calculated by
ZMRPSB (68) function.
The tP1 timer in figure 38
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
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.
ZOUTA
AND
ZINA
OR
ZOUTB
ZOUTC
detected
0
0-tW
ANSI05000113 V2 EN-US
Figure 38: Detection of power swing in phase A
38 presents a composition of an internal detection signal
39 presents a composition of the detection signals
serve as detection of initial power swings, which are usually
0-tP1
OR
0
-loop
0-tP2
AND
0
AND
Section 7
Impedance protection
38 are related
38 (internal
-loop
OR DET-A
AND
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