Settings - Siemens siprotec 7SD5 User Manual

2 Functions
Circuit Breaker for If a circuit breaker for voltage transformers (VT mcb) is installed in the secondary
Voltage Transform- circuit of the voltage transformers, the status is sent, via binary input, to the device in-
ers forming it about the position of the VT mcb. If a short-circuit in the secondary side ini-
tiates the tripping of the VT mcb, the distance protection function has to be blocked
immediately, since otherwise it would be spuriously tripped due to the lacking mea-
sured voltage during a load current. The blocking must be faster than the first stage of
the distance protection. This requires an extremely short reaction time for VT mcb
(≤ 4 ms at 50 Hz, ≤ 3 ms at 60 Hz nominal frequency). If this cannot be ensured, the
reaction time is to be set under address 2921 T mcb; this, however, will delay the re-
sponse of the protection function.

2.22.1.6 Settings

Addresses which have an appended "A" can only be changed with DIGSI, under Ad-
ditional Settings.
The table indicates region-specific presettings. Column C (configuration) indicates the
corresponding secondary nominal current of the current transformer.
Addr. Parameter
2901 MEASURE. SUPERV
2902A BALANCE U-LIMIT
2903A BAL. FACTOR U
2904A BALANCE I LIMIT
2905A BAL. FACTOR I
ΣI THRESHOLD
2906A
ΣI FACTOR
2907A
2908A T BAL. U LIMIT
2909A T BAL. I LIMIT
2910 FUSE FAIL MON.
2911A FFM U>(min)
2912A FFM I< (max)
2913A FFM U<max (3ph)
2914A FFM Idelta (3p)
390
C Setting Options
ON
OFF
10 .. 100 V
0.58 .. 0.95
1A 0.10 .. 1.00 A
5A 0.50 .. 5.00 A
0.10 .. 0.95
1A 0.10 .. 2.00 A
5A 0.50 .. 10.00 A
0.00 .. 0.95
5 .. 100 sec
5 .. 100 sec
ON
OFF
10 .. 100 V
1A 0.10 .. 1.00 A
5A 0.50 .. 5.00 A
2 .. 100 V
1A 0.05 .. 1.00 A
5A 0.25 .. 5.00 A
Default Setting
ON Measurement Supervision
50 V Voltage Threshold for
Balance Monitoring
0.75 Balance Factor for Voltage
Monitor
0.50 A Current Balance Monitor
2.50 A
0.50 Balance Factor for Current
Monitor
0.25 A Summated Current Moni-
toring Threshold
1.25 A
0.50 Summated Current Moni-
toring Factor
5 sec T Balance Factor for
Voltage Monitor
5 sec T Current Balance Monitor
ON Fuse Failure Monitor
30 V Minimum Voltage Thresh-
old U>
0.10 A Maximum Current Thresh-
old I<
0.50 A
5 V Maximum Voltage Thresh-
old U< (3phase)
0.10 A Delta Current Threshold
(3phase)
0.50 A
Comments
7SD5 Manual
C53000-G1176-C169-1