Alstom MiCOM P846, Technical Manual

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Troubleshooting P846/EN TS/D
MiCOM P846
(TS) 12-9
TS
7.3 Incorrect analog signals
The measurements may be configured in primary or secondary to assist. If it is suspected
that the analog quantities being measured by the relay are not correct then the measurement
function of the relay can be used to verify the nature of the problem. The measured values
displayed by the relay should be compared with the actual magnitudes at the relay terminals.
Verify that the correct terminals are being used (in particular the dual rated CT inputs) and
that the CT and VT ratios set on the relay are correct. The correct 120 degree displacement
of the phase measurements should be used to confirm that the inputs have been correctly
connected.
7.4 PSL editor troubleshooting
A failure to open a connection could be because of one or more of the following:
•
The relay address is not valid (note: this address is always 1 for the front port).
•
Password in not valid
•
Communication Set-up - COM port, Baud rate, or Framing - is not correct
•
Transaction values are not suitable for the relay and/or the type of connection
•
Modem configuration is not valid. Changes may be necessary when using a modem
•
The connection cable is not wired correctly or broken. See MiCOM S1 connection
configurations
•
The option switches on any KITZ101/102 this is in use may be incorrectly set
7.4.1 Diagram reconstruction after recover from relay
Although the extraction of a scheme from a relay is supported, the facility is provided as a
way of recovering a scheme in the event that the original file is unobtainable.
The recovered scheme will be logically correct, but much of the original graphical information
is lost. Many signals will be drawn in a vertical line down the left side of the canvas. Links
are drawn orthogonally using the shortest path from A to B.
Any annotation added to the original diagram (titles, notes, etc.) are lost.
Sometimes a gate type may not be what was expected, e.g. a 1-input AND gate in the
original scheme will appear as an OR gate when uploaded. Programmable gates with an
inputs-to-trigger value of 1 will also appear as OR gates.
7.4.2 PSL version check
The PSL is saved with a version reference, time stamp and CRC check. This gives a visual
check whether the default PSL is in place or whether a new application has been
downloaded.