Siemens SINAMICS S120 Engineering Manual page 24

1 Engineering SINAMICS S120 Booksize
Converter connection at the low-voltage line supply:
–
Inductance value per unit length of the converter connecting cable according to data sheet information
L'
FC line
–
Cable length to the converter
l
FC line
- Specific resistance of the converter connecting cable
ρ
FC
- Cross-section of one phase of the converter connection
q
FC
–
Minimum relative short-circuit power for the type of infeed corresponding to
RSC
min
–
Rated input current of the Line Module for a 380 V line supply voltage
I
rated_Line_Module
–
Rated power of the Line Module for the selected supply voltage
P
rated_Line_Module
– k factor – takes into account the supplementary losses in the transformer due to harmonic currents - for Booksize Line Modules, k = 1.27
k
infeed
11
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,
��
12
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
µ��
= 0.2550
��
35.0
= m
12
��
����
��
= 0.01852
��
= 75.0 mm²
= 30
192
= A
120
= kW
= 1.27
11
Table 1-1
24