Technical Data
4.24 Monitoring Functions
SIPROTEC, 7SD5, Manual
C53000-G1176-C169-5, Release date 02.2011
628
4.24
Monitoring Functions
Measured values
Trip circuit monitoring
Current sum
I
F
= |
I
L1
+
I
L2
+
I
L3
+ k
I
·
I
E
| >
SUM.I THRESHOLD ·
I
N
+ SUM.
I
FACTOR ·
Σ
|
I
|
- SUM.
I
THRESHOLD
for
I
N
= 1 A
0.10 A to 2.00 A
Increments 0.01 A
for
I
N
= 5 A
0.50 A to 10.00 A
Increments 0.01 A
- SUM.
I
FACTOR
0.00 to 0.95
Increments 0.01
Voltage sum
U
F
= | U
L1
+ U
L2
+ U
L3
+ k
U
· U
EN
| > 25 V
Current symmetry
|
I
min
|/|
I
max
| < BAL.FACTOR
I
while
I
max
/
I
N
> BAL.
I
LIMIT/
I
N
- BAL. FACTOR
I
0.10 to 0.95
Increments 0.01
- BAL.
I
LIMIT
for
I
N
= 1 A
0.10 A to 1.00 A
Increments 0.01 A
for
I
N
= 5 A
0.50 A to 5.00 A
Increments 0.01 A
- T BAL.
I
LIMIT
5 s to 100 s
Increments 1 s
Broken conductor
monitoring of the current transformer circuits on current step
change without voltage step change
Voltage symmetry
| U
min
|/| U
max
| < BAL.FACTORU
while | U
max
| > BAL.ULIMIT
- BAL.FACTORU
0.58 to 0.95
Increments 0.01
- BAL.ULIMIT
10 V to 100 V
Increments 1 V
- T BAL.ULIMIT
5 s to 100 s
Increments 1 s
Voltage phase sequence
U
L1
before U
L2
before U
L3
while | U
L1
|, | U
L2
| , | U
L3
| > 40 V/
√
3
Asymmetrical measuring voltage failure
(Fuse Failure Monitor)
3 · U
0
> FFM U> OR 3 · U
2
> FFM U>
AND simultaneously
3 ·
I
0
< FFM
I
< AND 3 ·
I
2
< FFM
I
<
- FFM U>
10 V to 100 V
Increments 1 V
- FFM
I
<
for
I
N
= 1 A
0.10 A to 1.00 A
Increments 0.01 A
for
I
N
= 5 A
0.50 A to 5.00 A
Increments 0.01 A
Three-phase measuring voltage failure
(Fuse Failure Monitor)
all U
Ph-E
< FFM UMEAS <
AND simultaneously
all
Δ
I
Ph
< FFM
I
delta
- FFM UMEAS <
2 V to 100 V
Increments 1 V
- FFM
I
delta
for
I
N
= 1 A
0.05 A to 1.00 A
Increments 0.01 A
for
I
N
= 5 A
0.25 A to 5.00 A
Increments 0.01 A
- T V SUPERVISION (waiting time for additional mea-
sured voltage failure monitoring)
0.00 s to 30.00 s
Increments 0.01 s
- T mcb
0 ms to 30 ms
Increments 1 ms
Phase angle positive-sequence power
Message when the angle is located inside the area of the P-Q
level parameterised by
ϕ
A and
ϕ
B.
-
ϕ
A,
ϕ
B
0° to 259°
Increment 1°
-
I
1
for
I
N
= 1 A
0.05 A to 2.00 A
Increment 0.01 A
for
I
N
= 5 A
0.25 A to 10.00 A
Increment 0.01 A
- U1
2 V to 70 V
Increment 1 V
Response time
Approx. 30 ms
