Monitoring Functions
Measured Quantities
Current symmetry
(for each side)
|Ι
min
|/|Ι
max
| < BAL. FACT. I M1
provided that Ι
max
/Ι
N
> BAL. I LIMIT M1/Ι
N
BAL.FAC. Ι
0.10 to 0.90 Increments 0.01
BAL. I LIMIT
0.10 A to 1.00 A
1)
Increments 0.01 A
Voltage balance
(if voltages applied)
|U
min
|/|U
max
| < BAL. FACTOR U
provided that |U
max
| > BALANCE U-LIMIT
BAL.FAC. U 0.58 to 0.90 Increments 0.01
BAL.U LIMIT 10 V to 100 V Increments 1 V
Voltage sum
(if voltages applied)
|U
L1
+ U
L2
+ U
L3
– k
U
U
en
| > 25 V
Current phase sequence
Ι
L1
leads Ι
L2
leads Ι
L3
if clockwise
Ι
L1
leads Ι
L3
leads Ι
L2
if counter-clockwise
if |Ι
L1
|, |Ι
L2
|, |Ι
L3
| > 0.5 Ι
N
Voltage phase sequence
(if voltages applied)
U
L1
leads U
L2
leads U
L3
if clockwise
U
L1
leads U
L3
leads U
L2
if counter-clockwise
if |U
L1
|, |U
L2
|, |U
L3
| > 40 V/√ 3
Broken wire unexpected instantaneous current value and
current interruption or missing zero crossing
1)
Secondary values based on Ι
N
= 1 A; for Ι
N
= 5 A they must be multiplied with 5.
4.19
Technical Data
4.19 Monitoring Functions
SIPROTEC 4, 7UT6x, Manual 455
C53000-G1176-C230-5, Edition 09.2016
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