Siemens SENTRON 3WA1 - Page 118

Description
2.5 Electronic trip unit ETU600
3WA1 air circuit breaker
116 Equipment Manual, 02/2023, 92310000002-06
ETU600 LSI, ETU600 LSIG, ETU600 LSIG Hi-Z
Protective function Setting range for parameter sets A
and B
Settings with rotary coding switch
only possible in parameter set A
Reverse power protection RP (optional)
Tripping
Can be switched on/off
Setting P
RP
0.05 ... 0.5 x P
n
Tripping time t
RP
0.01 … 25 s
1)
The setting is limited depending on the breaking capacity of the set rated voltage.
ETU600 LSIG with LSIG GFx (GF extended) option plug
Protective function
Setting range
G: Ground-fault protection GF
Tripping
Can be switched on/off
Method of ground-fault detection
Residual
Detection of the ground-fault current
through calculation of the summation
current in all phases of the N-
conductor
Direct
Direct measurement of the ground-
fault current using a current
transformer
Dual
UREF protection zone: Detection of
the ground-fault current through
calculation of the summation current
REF protection zone:
Measurement of the ground-fault
current using an external current
transformer
Characteristic GF curve
I
0
t / I
2
t / I
4
t / I
6
t
Current setting I
g
Residual acquisition method
Depending on the size:
• Size 1 / 2: 100 … 2000 A
• Size 3: 400 … 2000 A
Direct acquisition method
15 … 2000 A
Tripping time t
g
For I
x
t = OFF
0 … 5 s
For I
x
t = ON at 3 x I
g
0 … 30 s
Minimum tripping time t
g def
For I
x
t = OFF
0.05 … 0.5 s
Intermittent detection
Can be switched on/off
G: Ground-fault GF alarm
Alarm
Can be switched on/off
Current setting I
g alarm
Residual acquisition method
Depending on the size:
• Size 1 / 2: 100 … 5000 A
• Size 3: 400 … 5000 A
Direct acquisition method
15 … 5000 A
Alarm time t
g alarm
0 … 0.5 s