The monitoring function can also be used for the display of negative active power. In this case the areas must
be defined as shown in Figure 2-57 .
[wirkleistung-ind-kap--wlk040602, 1, en_GB]
Figure 2-57
Phase Angle Monitoring for Negative Active Power
The two angles must be at least 3° apart; if they are not, monitoring is blocked, and the indication
φ Set
wrong
(No. 132 is output.
The following conditions must be fulfilled for measurement to be enabled:
•
The positive sequence current
Ι
1
is higher than the value set in parameter 2943 I1>.
•
The positive sequence voltage
U
1
is higher than the value set in parameter 2944 U1>.
•
The angles set in address 2941 φA and 2942 φB must be at least 3° apart. Incorrect parameter settings
cause the indication 132
φ Set wrong
to be output.
•
The “Fuse-Failure-Monitor” and the measured voltage failure monitoring must not have responded, and
binary input indication 361
>FAIL:Feeder VT
must not be present.
If monitoring is not active, this fact is signaled by the indication
φ(PQ Pos) block
(No. 131).
Figure 2-58 shows the logic of the positive sequence system phase angle monitoring.
Functions
2.7 Monitoring Functions
SIPROTEC 4, 7VK61, Manual 139
C53000-G1176-C159-5, Edition 05.2018
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