Siemens SINAMICS G220 - Operation on a TT System

4.8 Operation on a TT system
Overview
The converter is suitable for connection to a TT system.
Requirement
The following applies to the connection of converters to a TT system:
• Operation in installations according to IEC and UL
– For installations according to IEC, operation on TT systems is permissible.
– For installations according to UL, operation on TT systems is not permissible.
• Converter with integrated or external line 󹪝lter
– Operation on TT systems with grounded neutral point is permissible
– Operation on TT systems without grounded neutral point is not permissible
• Converter without line 󹪝lter
– Operation on all TT systems permissible
Description
In a TT system, the PE protective conductor of the transformer and the installed system are
independent of one another.
There are TT systems with and without transfer of the neutral conductor N.
7UDQVIRUPHURU
JHQHUDWRU
7RWKHV\VWHP
([DPSOH7UDQVIHURI1JURXQGHGQHXWUDO
SRLQW
/
/
/
1
3(
Figure4-2 Example: Transfer of the neutral conductor, grounded neutral point
Application planning
4.8Operation on a TT system
SINAMICS G220 converter
72 Operating Instructions, 04/2024, FW V6.2, A5E51781573B AB