Functions
2.14 Monitoring Functions
SIPROTEC, 7SD80, Manual
E50417-G1140-C474-A1, Release date 09.2011
177
3-Phase Measuring Voltage Failure "Fuse Failure Monitor"
The minimum voltage below which a 3-phase measured voltage failure is detected is set in address 2913 FFM
V<max (3ph) unless a current step takes place simultaneously which exceeds the limit according to address
2914 FFM Idiff (3ph). These settings can only be changed via DIGSI at Display Additional Settings.
In address 2910 FUSE FAIL MON., the „fuse failure monitor“ can be switched OFF e.g. during asymmetrical
testing.
Measured Voltage Failure Monitoring
In address 2915 V-Supervision, the measured voltage failure monitoring can be switched to w/
CURR.SUP, w/ I> & 52a or OFF. Address 2916 T V-Supervision is used to set the waiting time of the
voltage failure monitoring. This setting can only be changed using DIGSI at Additional Settings.
2.14.1.6 Settings
Addresses which have an appended "A" can only be changed with DIGSI, under "Display Additional Settings".
The table indicates region-specific default settings. Column C (configuration) indicates the corresponding sec-
ondary nominal current of the current transformer.
Addr. Parameter C Setting Options Default Setting Comments
2901 MEASURE. SUPERV ON
OFF
ON Measurement Supervision
2902A BALANCE V-LIMIT 10 .. 100 V 50 V Voltage Threshold for
Balance Monitoring
2903A BAL. FACTOR V 0.58 .. 0.95 0.75 Balance Factor for Voltage
Monitor
2904A BALANCE I LIMIT 1A 0.10 .. 1.00 A 0.50 A Current Threshold for
Balance Monitoring
5A 0.50 .. 5.00 A 2.50 A
2905A BAL. FACTOR I 0.10 .. 0.95 0.50 Balance Factor for Current
Monitor
2906A Σ I THRESHOLD 1A 0.10 .. 2.00 A 0.25 A Summated Current Moni-
toring Threshold
5A 0.50 .. 10.00 A 1.25 A
2907A Σ I FACTOR 0.00 .. 0.95 0.50 Summated Current Moni-
toring Factor
2908A T BAL. V LIMIT 5 .. 100 sec 5 sec T Balance Factor for
Voltage Monitor
2909A T BAL. I LIMIT 5 .. 100 sec 5 sec T Current Balance Monitor
2910 FUSE FAIL MON. ON
OFF
ON Fuse Failure Monitor
2911A FFM V>(min) 10 .. 100 V 30 V Minimum Voltage Thresh-
old V>
2912A FFM I< (max) 1A 0.10 .. 1.00 A 0.10 A Maximum Current Thresh-
old I<
5A 0.50 .. 5.00 A 0.50 A
2913A FFM V<max (3ph) 2 .. 100 V 5 V Maximum Voltage Thresh-
old V< (3phase)
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