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6.3
Connection Types and Connection Examples
6.3.1
Using SICAM P850/P855 in the Power Systems IT, TT, and TN
When using SICAM P850/P855 in the power systems IT, TT, and TN, no special operating conditions must be
observed.
6.3.2
Connection Types
SICAM P850/P855 supports the following connection types:
•
1-phase system
•
3-wire network (balanced)
•
3-wire network (unbalanced), 2 current inputs
•
3-wire network (unbalanced), 3 current inputs
•
4-wire network (balanced)
•
4-wire network (unbalanced)
6.3.3
Examples - Standard Application
The following input wiring diagrams are examples. Up to the maximum allowable current and voltage values
(see chapter 13.1) SICAM P850/P855 can also be connected without interconnected current and voltage trans-
formers.
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.
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.
SICAM P850/P855, 7KG85xx, Device Manual
E50417-H1040-C482-A6, Edition 10.2018
6 Connection Principle
6.3 Connection Types and Connection Examples
89
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