Performance of Current Tests
DANGER
Live system parts! Capacitive coupled voltages on dead parts!
Non-observance of the safety notes will result in death, severe injury, or considerable material
damage.
²
Primary measures may be performed only on dead and grounded system parts.
NOTE
These tests cannot replace a visual check of the correct current-transformer connections. Therefore,
completed checks of the system connections are a prerequisite.
The SIPROTEC 5 device provides operational measured values. With these operational measured values, a fast
commissioning without external instrumentation is possible.
The following procedure is intended for 3-phase protected objects, that is, for measuring point 1 against
measuring point 2. For transformers, it is assumed that side 1 is the upper-voltage side of the transformer. The
other possible current circuits are tested in an analog way.
•
Read the differential and restraint currents under:
Main menu → Measured values.
•
Check the direction information of the
(_:302) Ground fault
indication in the fault log or in the
ground-fault log. The direction information
forward
must be logged for the
(_:302) Ground fault
indication.
If
backward
is determined as the direction, there is an inversion in the neutral path either for the current
connections or for the voltage connections. If
unknown
is displayed, the ground current is probably too
low.
•
Switch off the line and ground it.
This completes the test.
Functional Tests
10.10 Commissioning Hints for Voltage Control
SIPROTEC 5, High-Voltage Bay Controller, Manual 1091
C53000-G5040-C015-9, Edition 11.2017
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