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6 Connection Principle and Applications
6.3 Connection Types and Connection Examples
6.3.3
Connection Examples - Standard Application
The following input wiring diagrams are examples. Up to the maximum allowable current and voltage values
(see chapter 13.1) SICAM MMU can also be connected without interconnected current and voltage transform-
ers.
Required voltage transformers can be operated in star connection or delta connection.
All input and output terminals that are not needed for measurements remain unwired.
NOTE
The illustration of the consistent ground connection of the instrument transformers is simplified in the following
connection examples. The secondary windings of the current transformers installed in a high-voltage power
system must be grounded on one side.
For SICAM MMU (voltage measurement inputs galvanically isolated), the electrical connection PE-N is not
mandatory.
NOTE
Take care at the following connection examples at the parameter setting that the parameter Calculate VN is
setting for yes (see chapter 7.3.3.1.1).
DANGER
Hazard due to high voltages in the event of a breakdown of the winding insulation
Non-observance will lead to death or serious injury.
✧
Ground the secondary windings of the current transformers on one side. They are installed in a high-
voltage power system.
60
SICAM MMU 7KG9663, Device Manual
E50417-H1040-C514-A3, Edition 01.2016
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