Current Transformer; Surge Arresters; Isolating Cylinder; Figure 3-6 Isolating Cylinder - Siemens SINAMICS GL150 Operating Instructions Manual

3.3.2.6

Current transformer

Current transformers are used to measure current. The analog output signals from the current
transformer are post-processed by the AVT combination module and sent via the fiber-optic
cable to the power stack adapter. The primary circuit is separate from the secondary circuit.
3.3.2.7

Surge arresters

Overvoltages can occur when inductive loads are switched, for example, in the case of
transformer disconnections at no load. These overvoltages can pose a danger to the converter.
For indoor systems, surge arresters without spark gap are connected in a star configuration
between the phases to limit the overvoltages.
3.3.2.8

Isolating cylinder

The isolating cylinder prevents dangerous high voltages from developing around the current
transformer. For this purpose, the outer cable must be connected to ground and the inner cable
to potential.
Figure 3-6
Dangerous voltage at the isolating cylinder
The isolating cylinder separates exposed circuits from high-voltage circuits. Interfering with
the structure and connections of the isolating cylinder can result in death, severe injury and
considerable material damage.
Do not change the structure of the isolating cylinder.
SINAMICS GL150 6SL38555UN113KA0Z
Operating Instructions Rev.201910281450 EXAMPLE
Isolating cylinder
WARNING
Description
3.3 Power unit
35