Mounting and Commissioning
3.3 Commissioning
SIPROTEC, 7RW80, Manual
C53000-G1140-C233-1, Release date 10.2010
168
3.3.5
Testing User-Defined Functions
CFC Logic
The device has a vast capability for allowing functions to be defined by the user, especially with the CFC logic.
Any special function or logic added to the device must be checked.
Of course, general test procedures cannot be given. Configuration of these functions and the target conditions
must be actually known beforehand and tested. Possible interlocking conditions of switching devices (circuit
breakers, disconnectors, ground switch) are of particular importance. They must be observed and tested.
3.3.6
Voltage and Phase Rotation Testing
The connections of the voltage transformers are tested using primary quantities. The line is energized and will
remain in this state during the measurements.
If measurement circuits are connected correctly, all Measured Value Monitoring of the device will stay inactive.
If an element detects a problem, the causes which provoked it may be viewed in the Event Log. If voltage sum
errors are found, check the matching factors.
Messages from the symmetry monitoring could occur because there actually are asymmetrical conditions in
the network. If these asymmetrical conditions are normal service conditions, the corresponding monitoring
functions should be made less sensitive.
Voltage Values
The voltages can be seen in the display field at the front of the device or the operator interface via a PC. They
can be compared to the quantities measured by an independent source, as primary and secondary quantities.
If the measured values are implausible, the connection must be checked and corrected after the line has been
isolated. The measurements must then be repeated.
Phase Rotation
The phase rotation must correspond to the configured phase rotation, in general a clockwise phase rotation. If
the system has an anti-clockwise phase rotation, this must have been considered when the power system data
was set (address
209
PHASE SEQ.
). If the phase rotation is incorrect, the alarm
„Fail Ph. Seq.“
(FNo
171) is generated. The measured value phase allocation must be checked
Voltage Transformer Miniature Circuit Breaker (VT mcb)
The VT mcb of the feeder (if used) must be opened. The measured voltages in the operational measured
values appear with a value close to zero (small measured voltages are of no consequence).
Check in the spontaneous annunciations that the VT mcb trip was entered (annunciation
„>FAIL:FEEDER
VT“
„ON“ in the spontaneous annunciations). Beforehand it has to be assured that the position of the VT mcb
is connected to the device via a binary input.
Close the VT mcb again: The above messages appear under the spontaneous messages as „OFF“, i.e.
„>FAIL:FEEDER VT“
„OFF“.
If one of the events does not appear, the connection and allocation of these signals must be checked.
If the
„ON“
-state and
„OFF“
–state are swapped, the contact type (H–active or L–active) must be checked and
remedied.
