Siemens SINAMICS S120 Engineering Manual page 23

1 Engineering SINAMICS S120 Booksize
Low-voltage line supply:
- Voltage of the low-voltage line supply
U
LV line
–
Inductance value per unit length of the low-voltage cable according to data sheet information
L'
LV line
–
Length of the low-voltage cable
l
LV line
- specific resistance of the low-voltage cable
ρ
LV
- Conductor cross-section of one phase of the low-voltage connection
q
LV
9 This value is very dependent on the geometrical structure of the cable and/or the conductor. The following approximate values can be used if more precise data are not available:
µ��
0.25 for cables and conductors,
��
µ��
0.38 for busbars,
��
µ��
1.05 for outdoor overhead cables
��
10
specific resistances of copper, aluminum and aluminum alloy
2
1 ����
Ω
for copper
54 ��
2
1 ����
Ω for aluminum
34 ��
2
1 ����
Ω for aluminum alloy
31 ��
Engineering manual S120 Booksize
Entry-ID: 109808992, V1.0, 04/2022
© Siemens AG 2022 All rights reserved
= 400 V
µ��
= 0.2550
��
= 55.0 m
10
��
����
��
= 0.01852
��
= 2000.0 mm²
9
23