Capacitance per unit length: Low-capacitance motor cables reduce leakage current

Question:
What is a 'low-capacitance' motor cable and what motor cable type is recommended by Lenze?

Answer:
Low-capacitance motor cables have a comparatively low capacitance per unit length [pF/m]. 
As low-capacitance motor cables, Lenze recommends e.g. the MSR motor cables from Siemens. Type designation: 2YSLCY-J.
This cable type features both a low capacitance per unit length between the cores and the shield as well as a low capacitance per unit length between the individual cores.
The 4-core cables are available with cross sections of 1.5 mm² to 120 mm².
 
Typical capacitance per unit length of a low-capacitance cable (example with a core cross-section of 1.5 mm²):
  • (core-core):       45 pF/m 
  • (core-shield):  105 pF/m

Note:
During inverter operation, there always occur leakage currents. They can be reduced by using low-capacitance motor cables.
With bigger cross sections, the capacitance per unit length of a cable only increases slightly. Example: 20 times higher cross section  --> only twice the capacitance per unit length.


URL for linking this AKB article: https://www.lenze.com/en-de/go/akb/20010165/1/
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AKB-ID: 20010165
Last update: 2024/01/25
Category: FAQ, Tips and Tricks

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