Siemens SENTRON 3WL10, Руководство пользователя

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Description
2.4 Electronic trip unit ETU
Air circuit breaker 3WL10
Manual, 11/2017, L1V30499596002-01
55
Protection functions of the ETU ETU320 LI ETU350 LSI ETU360 LSIG
N Neutral protection
Neutral protection can be enabled/
disabled
● ● ●
Current setting value I
N
= I
n
x … 0.5; 1; 2
Default value: 0.5 0.5; 1; 2
Default value: 0.5 0.5; 1; 2
Default value: 0.5
G GF: Ground-fault protection
Protection function can be enabled/
disabled
— — ●
Characteristic (switchover possible) — — I²t / t = constant
Default value: I²t
Setting range for operating value
I
g
= I
n
x …
(The range <0.2 I
n
or <0.25 I
n
(for I
n
= 400 A) requires an external
auxiliary power supply of the ETU)
— — 0.1; 0.2; 0.3; 0.4; 0.5;
0.6; 0.7; 0.8; 1
Default value: 0.1
Tolerance
1)
: ± 7%
Setting range for delay time t
g
(fixed)
t=k
— — 0.1; 0.2; 0.4; 0.6; 0.8 s
Tolerance
1)
: The better
value out of ± 10 % or
± 40ms or 50 ms with
t
g
= instantaneous
Setting range for delay time t
g
at I²t
(reference point 2 x I
g
)
— — 0.1; 0.2; 0.4; 0.6; 0.8 s
Default value: 0.1 (I²t)
Func-
tions
Frequency adaptation
Setting of the line frequency on ETUs
of the 3-series with DIP switches
50 Hz; 60 Hz
Default value: 50 Hz 50 Hz; 60 Hz
Default value: 50 Hz 50 Hz; 60 Hz
Default value: 50 Hz
1)
ETU powered in at least 2 phases or self-powered with auxiliary voltage. In all other cases,
the following tolerances apply:
Current setting value Tripping time
L Tripping between 1.05 and 1.2 x I
r
± 20 %
S ± 10 % ± 20 %
I ± 15 % ≤ 60 ms
G ± 15 % ± 20 %