Siemens WL Series - Page 349

25 – 10
✔ available
– not available
O optional
WL Circuit Breaker
Function Overview of the Electronic Trip Units
Basic Functions ETU748 ETU755 ETU776
Parameter sets
Selectable between
parameter set A and B – ✔✔
LCD
LCD, alphanumeric (4-line)
O ––
LCD, graphic – – ✔
Communication
CubicleBUS integrated ✔✔✔
Communication capability via
MODBUS or PROFIBUS ✔✔ ✔
Metering function
Metering function capability with
Metering Function or
Metering Function PLUS ✔✔✔
Display by LED
Trip unit active ✔✔✔
Alarm ✔✔✔
ETU error ✔✔✔
L trip ✔✔ ✔
S trip ✔✔ ✔
I trip - ✔✔
N trip ✔✔✔
G trip ✔
(only with ground fault module) ✔ (only with ground fault module) ✔ (only with ground fault module)
G alarm ✔ (only with ground fault module) ✔ (only with ground fault module) ✔ (only with ground fault module)
Tripped by extended protection or
protective relay function ✔✔✔
Communication ✔✔✔
Signal contacts with external CubicleBUS modules
(Opto or relay)
Overcurrent warning ✔✔✔
Load shedding OFF/ON ✔✔✔
Early signal of long time trip (200ms) ✔✔ ✔
Temperature alarm ✔✔ ✔
Phase unbalance ✔✔ ✔
Instantaneous trip ✔✔ ✔
Short-time trip ✔✔ ✔
Long-time trip ✔✔✔
Neutral conductor trip ✔✔ ✔
Ground fault protection trip ✔
(only with ground fault module) ✔ (only with ground fault module) ✔ (only with ground fault module)
Ground fault alarm ✔ (only with ground fault module) ✔ (only with ground fault module) ✔ (only with ground fault module)
Auxiliary relay ✔✔ ✔
ETU error ✔✔✔
Protective Relaying Pick-up Accuracy
Phase Unbalance (I) 2% (5…50% I
n
)
Phase Unbalance (V) 2% (5…50% V
n
)
THD (I) +/- 3% (80…120% V
n
)
THD (V) +/- 3% (80…120% V
n
)
Overvoltage +/- 2% (80…120% V
n
)
Undervoltage +/- 2% (80…120% V
n
)
Under/Over Frequency +/- 0.1 Hz
Metering and Protective Relaying Accuracies
Metering Values Accuracy
(I) at 1 x I
n
+/- 1%
(V) at 1 x V
n
+/- 0.5%
(P) at 1x I
n
+/- 3%
(S) at 1 x I
n
+/- 2%
(Q) at 1 x I
n
+/- 3%