Monitoring Function - Siemens SIPROTEC 7SA522 Manual

4.19

Monitoring Function

Measured Values
Current sum
- SUM I THRESHOLD
- SUM.I factor
Voltage sum
Current symmetry
- BAL.FACTOR I
- BAL.I LIMIT
- T BAL.I LIMIT
Broken conductor
Voltage symmetry
- BAL.FACTOR U
- BAL.U LIMIT
- T BAL.U LIMIT
Voltage phase sequence
Non-symmetrical voltages
(Fuse failure monitoring)
- FFM U>
- FFM I<
Three-phase measuring voltage failure
(fuse failure monitoring)
- FFM U<max
- FFM I
delta
- T V-Supervision (wait time for additional measured
voltage failure monitoring)
- T VT mcb
7SA522 Manual
C53000-G1176-C155-3
I = | I + I
F L1 L2
SUM.I Threshold · I
for I = 1 A 0.05 A to 2.00 A
N
for I = 5 A 0.25 A to 10.00 A
N
0.00 to 0.95
U = | U + U
F L1
| I | / | I
min max
as long as I
max
0.10 to 0.95
for I = 1 A 0.10 A to 1.00 A
N
for I = 5 A 0.50 A to 5.00 A
N
5 s to 100 s
One conductor without current, the others with current
| U | / | U
min max
as long as| U
0.58 to 0.95
10 V to 100 V
5 s to 100 s
U beforeU
L1 L2
as long as | U
3 · U > FFM U> OR 3 · U
0
AND at the same time
3 · I < FFM I< AND 3 · I
0
10 V to 100 V
for I = 1 A 0.10 A to 1.00 A
N
for I = 5 A 0.50 A to 5.00 A
N
All U < FFM UMEAS<
Ph-E
AND at the same time
All ∆I
< FFM Idelta
Ph
AND
All I > (I > (Dist.))
Ph Ph
OR
All U < FFM UMEAS<
Ph-E
AND at the same time
All I < (I > (Dist.))
Ph Ph
AND
All I > 40 mA
Ph
2 V to 100 V
for I = 1 A 0.05 A to 1.00 A
N
for I = 5 A 0.25 A to 5.00 A
N
0.00 s to 30.00 s
0 ms to 30 ms
+ I + k · I | >
L3 I E
+ SUM.I factor ·Σ | I |
N
Increments 0.01 A
Increments 0.01 A
Increments 0.01
+ U + k · U | > 25 V
L2 L3 U EN
| < BAL.FACTOR.I
/ I > BAL.I LIMIT / I
N N
Increments 0.01
Increments 0.01 A
Increments 0.01 A
Increments 1 s
| < BAL.FACTOR.U
| > BAL.U LIMIT
max
Increments 0.01
Increments 1 V
Increments 1 s
beforeU
L3
|, | U | , | U | > 40 V/√3
L1 L2 L3
> FFM U>
2
< FFM I<
2
Increments 1 V
Increments 0.01 A
Increments 0.01 A
Increments 1 V
Increments 0.01 A
Increments 0.01 A
Increments 0.01 s
Increments 1 ms
4.19 Monitoring Function
477