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ANSI09000223-3-en.vsd
I0CHECK
AND
BLK_I0
t
10 ms
AND
BLK_SS
BLOCK
INHIBIT
ZOUT_C
ZOUT_B
ZOUT_A
EXT_PSD
AND
PICKUP
ZOUT
ZIN_A
ZIN_B
ZIN_C
ZIN
AND
t
tR1
OR
AND
AND
OR
OR
OR
OR
-loop
-loop
0
0-tR2
0-tH
0
OR
DET 1of3 - int
DET 2of3 - int
ANSI09000223 V3 EN
Figure 64:
Simplified block diagram for ZMRPSB (68) function
7.1.6.5
Operating and inhibit conditions
presents a simplified logic diagram for the Power swing detection function
ZMRPSB (68).
The load encroachment characteristic can be switched off by setting the parameter
OperationLdCh
=
Disabled
, but notice that the
D
Fw and
D
Rv will still be calculated from
RLdOutFw
and
RLdOutRv
. The characteristic will in this case be only quadrilateral.
There are three different ways to form the internal INHIBIT signal:
•
Logical 1 on functional input BLOCK inhibits the output PICKUP signal
instantaneously.
•
The INHIBIT internal signal is activated, if the power swing has been detected and
the measured impedance remains within its operate characteristic for the time, which
Section 7
1MRK 502 048-UUS A
Impedance protection
158
Technical manual
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