Siemens SENTRON 3WL10 Series Manual page 57

Protection functions of the ETU
N Neutral protection
Neutral protection can be enabled/
disabled
Current setting value I
G GF: Ground-fault protection
Protection function can be enabled/
disabled
Characteristic (switchover possible)
Setting range for operating value
I = I x ...
g n
(The range <0.2 I
(for I = 400 A) requires an external
n
auxiliary power supply of the ETU)
Setting range for delay time t
t=k
Setting range for delay time t
(reference point 2 x I
Func- Frequency adaptation
tions
Setting of the line frequency on ETUs
of the 3-series with DIP switches
ETU powered in at least 2 phases or self-powered with auxiliary voltage. In all other cases,
1)
the following tolerances apply:
L
S
I
G
Air circuit breaker 3WL10
Manual, 11/2017, L1V30499596002-01
ETU320 LI
●
= I x ... 0.5; 1; 2
N n
Default value: 0.5
—
—
—
or <0.25 I
n n
(fixed) —
g
at I²t —
g
)
g
50 Hz; 60 Hz
Default value: 50 Hz
Current setting value
Tripping between 1.05 and 1.2 x I
± 10 %
± 15 %
± 15 %
2.4 Electronic trip unit ETU
ETU350 LSI
●
0.5; 1; 2
Default value: 0.5
—
—
—
—
—
50 Hz; 60 Hz
Default value: 50 Hz
Tripping time
± 20 %
r
± 20 %
≤ 60 ms
± 20 %
Description
ETU360 LSIG
●
0.5; 1; 2
Default value: 0.5
●
I²t / t = constant
Default value: I²t
0.1; 0.2; 0.3; 0.4; 0.5;
0.6; 0.7; 0.8; 1
Default value: 0.1
Tolerance : ± 7%
1)
0.1; 0.2; 0.4; 0.6; 0.8 s
Tolerance : The better
1)
value out of ± 10 % or
± 40ms or 50 ms with
t = instantaneous
g
0.1; 0.2; 0.4; 0.6; 0.8 s
Default value: 0.1 (I²t)
50 Hz; 60 Hz
Default value: 50 Hz
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