Siemens SENTRON 3WL10 - Page 71

Protection functions of the ETU ETU650 LSI ETU660 LSIG
G GF: Ground-fault protection
Protection function can be enabled/disabled — ●
Characteristic — I²t / t = constant
Default value: t = constant
Setting range for operating value I
g
= I
n
x … — 0.1 to 1 (in steps of 0.001)
Default value: 0.1
Tolerance
1)
: ± 7%
Setting range for delay time t
g
(󹪝xed) t=k — 0.1 to 1 s (in steps of 0.05)
Default value: 0.1s
Tolerance
1)
: The better value
out of ± 10% or ± 40 ms or 50
ms with t
g
=instantaneous
Setting range for delay time t
g
at I²t (reference
point 2 x I
g
)
— 0.1 to 1 s (in steps of 0.05)
Ground-fault protection pre-alarm — 50 to 90% x I
r
(in steps of 1%)
Default value: 90%
Tripping can be deactivated — ●
Switchover to the alternative of the external, di‐
rectly measured ground-fault protection
— ●
Default value: OFF
Switchover to alternative operating values with
ground-fault current during the switch-on phase
(inrush adaptation) for tripping characteristic t=k
(󹪝xed) possible
— ●
Default value: OFF
Setting range of the switch-on phase (inrush
adaptation)
— 0.1 to 30 s (in steps of 0.01)
Default value: 0.1
Setting range I
g
= I
n
x … during the switch-on
phase (inrush adaptation)
— 0.2 to 1 (in steps of 0.01)
Default value: 1
Extended parameter range with ext.auxiliary
power supply of the ETU
— - I
g
full range,
otherwise I
g
limited to
min.0.2I
n
or 0.25I
n
(for
I
n
=400A)
- t
g
possible instantaneously
Description
2.9Electronic trip unit ETU
3VA27 molded case circuit breakers & 3WL10 air circuit breakers
70 Equipment Manual, 10/2023, L1V30499596002-03