expected, or if one or more monitoring functions pick up sporadically during normal operation, the sensitivity
settings should be made less sensitive..
At address 2901 MEASURE. SUPERV measurement supervision can be switched ON or OFF.
Symmetry monitoring
Address2902 BALANCE U-LIMIT determines the limit voltage (phase-to-phase), above which the voltage
symmetry monitoring is effective. Address 2903 BAL. FACTOR U is the associated balance factor, i.e. the
gradient of the balance characteristic. The indication
Fail U balance
(No 167) can be delayed under
address 2908 T BAL. U LIMIT. These settings can only be changed via DIGSI at Display Additional
Settings.
Address2904 BALANCE I LIMIT determines the limit current above which the current symmetry monitoring
is effective. Address 2905 BAL. FACTOR I is the associated balance factor, i.e. the gradient of the balance
characteristic. The indication
Fail I balance
(No 163) can be delayed under address 2909 T BAL. I
LIMIT. These settings can only be changed via DIGSI at Display Additional Settings.
Sum Monitoring
Address 2906 ΣI THRESHOLD determines the limit current above which the current sum monitoring is acti-
vated (absolute portion, only relative to Ι
N
). The relative portion (relative to the maximum phase current) for
activating the current sum monitoring is set at 2907 ΣI FACTOR. These settings can only be changed via
DIGSI at Display Additional Settings.
NOTE
Current sum monitoring can operate properly only when the residual current of the protected line is fed to
the fourth current input (Ι
4
) of the relay.
Asymmetrical measuring voltage failure "Fuse Failure Monitor"
The settings for the “fuse failure monitor” for non-symmetrical measuring voltage failure must be selected
such that on the one hand it is reliably activated if a phase voltage fails (address 2911 FFM U>(min)), but
does not pick up on earth faults in an earthed network on the other hand. Accordingly, address 2912 FFM I<
(max) (max) must be set sufficiently sensitive (below the smallest fault current during earth faults). These
settings can only be changed via DIGSI at Display Additional Settings.
In address 2910 FUSE FAIL MON. the “Fuse-Failure-Monitor”, e.g. during asymmetrical testing, can be
switched OFF.
Three-phase measuring-voltage failure "Fuse Failure Monitor"
In address 2913 FFM U<max (3ph) the minimum voltage threshold is set.If the measured voltage drops
below this threshold and a simultaneous current jump which exceeds the limits according to address 2914
FFM Idelta (3p) is not detected while all three phase currents are greater than the minimum current
required for the impedance measurement by the distance protection according to address, a three-phase
measured voltage failure is recognized. These settings can only be changed via DIGSI at Display Additional
Settings.
In address 2910 FUSE FAIL MON. the “Fuse-Failure-Monitor”, e.g. during asymmetrical testing, can be
switched OFF.
Measured voltage failure monitoring
The measured voltage failure monitoring can be switched under address 2915 V-Supervision w/
CURR.SUP, w/ I> & CBaux or OFF. Address 2916 T V-Supervision is used to set the waiting time of the
voltage failure supervision. This setting can only be changed in DIGSI at Display Additional Settings.
Monitoring the phase angle of the positive sequence power
The parameters 2943 I1> and 2944 U1> are used to specify the minimum positive sequence system quanti-
ties required for measurement of the positive sequence power. The angles set in address 2941 φA and 2942
Functions
2.7 Monitoring Functions
142 SIPROTEC 4, 7VK61, Manual
C53000-G1176-C159-5, Edition 05.2018
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