Siemens SENTRON 3VL System Manual page 123

Characteristic Application
curve
ETU12 for line protection,
LIG/LING function
Overload protection I
0.95; 1 x I
time-lag class t
Short-circuit protection (instantaneous)
I = 1.25 to 11 x I
i
On 4-pole circuit breakers:
neutral conductor protection 50%/100% × I
Ground fault protection:
I = 0.6/1.0 I
g
measuring method No. 1: (G
summation current formation in the three
phases and neutral conductor (4-conductor
systems); I
"MF", "TN", "NN"
ETU22 for line and generator protection,
LSIG/LSING function
Overload protection I
0.95; 1 x I
Short-circuit protection (short-time delay)
I = 1.5 to 10 x I
sd
I t selectable on/off
2
Short-circuit protection (instantaneous)
I = 11 x I
i
dependent)
On 4-pole circuit breakers:
neutral conductor protection 50%/100% × I
Ground fault protection:
I = 0.6/1.0 I
g
Measuring method No. 1: (G
summation current formation in the three
phases and neutral conductor (4-conductor
systems);
I = I
Δn
"TH", "NH"
3VL molded-case circuit breakers
System Manual, 03/2009, 110 0110 - 02 DS 01
= 0.4; 0.45; 0.5 to
R
n
= 2.5 to 30
R
(frame-size-dependent)
n
, t = 0.1/0.3 s
n g
) vectorial
R
= I , versions "SL", "SF", "ML",
Δn n
= 0.4; 0.45; 0.5 to
R
,
n
, t = 0 to 0.5 s
R sd
(fixed setting, frame-size-
n
, t = 0.1/0.3 s
n g
) vectorial
R
, versions "SG", "MG", "SH", "MH",
n
9.1 Overcurrent trip unit without LCD display
View
I
t
1.0 .4 (S)
30
R
R
.95 .45 25
.9 .5
20
.8
.6
X3 17
I
x .7 .63 14
n
R
I I
1.0 .4
10
R
sd
.95 .45 8
.9 .5
7
.8
.6
X3 6
I
x .7 .63
5
n
R
Displays and operator controls
I t
I
2.5 11 1.25 I
.6/.1
g g OFF
i
4
10 1.5
1/.3 1/.1
.6/.3
6
8 2 .6/.3
I 1/.1 1/.3
8 6 3
I
x N .6/.1 OFF
10 5 4
n
100% 50%
I t
t
(S)
1.5 I
.4 0
g g OFF .6/.1
sd
2 .3
.1
1/.3 1/.1
.6/.3
2.5 .2 .2
.6/.3
I 2 t
2
t I
.1 .3 I 1/.1 1/.3
3
I .4
ON .5
x N .6/.1 OFF
4 OFF
R
100% 50%
Alarm
>1.05
Active
I
N
Alarm
>1.05
Active
I
N
123