Siemens SENTRON 3WA1 - Page 119

Description
2.5 Electronic trip unit ETU600
3WA1 air circuit breaker
Equipment Manual, 02/2023, 92310000002-06
117
ETU600 LSIG Hi-Z with LSIG GFx (GF extended) option plug
Protective function
Setting range
G: Ground-fault protection GF
Ground-fault protection GF Hi-Z
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 (UREF protection zone
only)
Dual Hi-Z,
for high-impedance connection of the
external current transformers
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
combination
UREF protection zone
Tripping
If ground-fault protection GF Hi-Z is
activated
Current setting I
g
Depending on the size:
• Size 1 / 2: 100 … 2000 A
• Size 3: 400 … 2000 A
Characteristic GF curve
I
0
t / I
2
t / I
4
t / I
6
t
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
REF protection zone
Alarm
If ground-fault protection GF Hi-Z is
activated
Current setting I
g
Resulting from:
• Transformation ratio of the
current transformer (1 … 7000)
• Shunt (10 ... 1000 Ω)
• Secondary current via shunt
(11 ... 5000 mA)
Alarm time t
g
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
UREF protection zone
Depending on the size:
• Size 1 / 2: 100 … 5000 A
• Size 3: 400 … 5000 A
Alarm time t
g alarm
0 … 0.5 s