100 200 300
0.0
0.5
1.0
1.5
2.0
2.5
3.0
/
--
-
-
(1/ µs)
U
n
-
-
-
u
----
d
-
t
-
d
l (m)
Û
LL
/U
n
A
Û
LL
/U
n
l (m)
du/dt
U
n
-------------(1/µs)
1.0
2.0
5.0
4.0
3.0
1.5
2.5
3.5
4.5
100 200 300
5.5
B
Drive with d
u
/d
t
filterA
Drive without d
u
/d
t
filterB
Motor cable length
I
Nominal AC line voltage
U
n
Relative peak line-to-line voltage
Û
LL
/
U
n
Relative d
u
/d
t
value(d
u
/d
t
)/
U
n
Note:
Û
LL
and d
u
/d
t
values are approximately 20% higher with resistor braking.
Additional note for sine filters
A sine filter also protects the motor insulation system. The peak phase-to-phase
voltage with a sine filter is approximately 1.5 ·
U
n
.
Guidelines for planning the electrical installation 105
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