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Special Auto Transformers
a Neutral Line
In many countries, worldwide,
electricity is not always supplied with
a neutral line. Where a single-phase
line is present, the addition of the
neutral can be helpful also for
stability creation in unbalanced loads.
There are various possibilities:
there is a need to separate loads from a
power supply, a transformer with a
secondary can be installed, thus
creating a stable neutral.
separation is not needed or requested,
an autotransformer with a neutral
creator can be installed.
The autotransformer is actually a
reactor with a zig zag connection.
creation and power adaptation
If it is necessary to
adapt the power from 220 to 400, it is possible with a
autotransformer, with simple or dual Zig
Three-phase autotransformers are almost
entirely built with a star connection,
but in some cases can be built with a
triangle connection, but in the latter
case the transferred power is a bit
Motor start up autotransformers are
efficient for motor take-off current
limitation, mainly with medium and high
They can be supplied with one or more
sockets, which serve for gradual start
ups, reducing and easing the current
Once the start up has been made, the
autotransformer disconnects, thus
limiting the working time to tenths of a
When ordering, please mention the exact
connection time, the number of start ups
in an hour and how many steps are needed.