Chapter 3 – Electrical Installation
ACA 6xx Sections and ACS/ACC 6x7 (132 to 3000 kW) Frequency Converters 3-11
High Power Supply
Busbar connection A high current (> 300 A) busbar connection is represented below.
Cable Bus System The connection of a high current (> 300 A) cable bus system that
consists of several cables is represented below. In this system, less
conductor material is needed due to better cooling of separate
conductors.
L1
L2
L3
N
Transformer Converter
L1
L2
L3
PE
PE
Factory main earthing bus
1)
1) Connect the metal
conduit of the busbar
system (or the metal of
the bus duct) to PE at
either one end or both
ends.
Metal conduit (shield)
L1 L2
L3
N
Note: The paint should be removed to allow a good connection to the cabinet frames
throughout the whole perimeter of the metal conduit (or a bus duct). The metal conduit
(or the bus duct metal) should be electrically continuous throughout its complete
length.
It is recommended to arrange the cables as
shown alongside to achieve a current
distribution as accurate as possible. Air
between cables is required for cooling.
L1
L3
L2
L1
L3
L2
L1
L3
L2
L1
L3
L2
N
L1
L3
L2
NL1
L3L2
N
L1
L2
L3
N
Transformer Converter
L1
L2
L3
PE
PE
Factory main earthing bus
Note: Current derating of the cables is required when installing the cables in a cable
tray. This derating factor must be taken into account as per the local electrical safety
codes.
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