P54x/EN OP/La4 Operation
(OP) 5-116
MiCOM P543, P544, P545 & P546
OP
The operation of the change configuration logic is as follows:
1. The configuration setting is changed
2. The relay detects the change in setting and attempts to implement the new setting
3. If the relay configuration is 2-ended and the new setting is also 2-ended then the relay
will block the change and issue a configuration error alarm
If the relay configuration is 2-ended and the new setting is 3-ended then the relay will check
that all the communications are healthy and send out the restore command to the other
relays. It will then check that the scheme has stabilized at 3-ended after one second.
If any of the communications in the scheme were failed or if the scheme has not stabilized at
3-ended then the relay will return to its original 2-ended setting and issue a configuration
error alarm.
If the scheme did stabilize at 3-ended then the Re-configuration setting will be updated.
If the relay configuration is 3-ended and the new setting is 2-ended L & R1 then the relay will
first check that the two interlock opto-inputs, Inhibit Diff and Interlock” are energized (note
that the Inhibit Diff opto-input will inhibit the differential tripping, but the backup protection
can still operate the trip outputs). These inputs are allocated to opto-inputs L3 and L4 in the
default programmable scheme logic. The relay then checks that the communication with
Remote 1 relay is healthy and sends out the command to the remote relays. It will then
check that the scheme has stabilized at 2-ended L & R1after one second.
If the interlocks are not energized or the communication with Remote 1 relay has failed or
the scheme does not stabilize at 2-ended L & R1 then the relay will return to 3-ended and
will issue a configuration error alarm.
If the scheme did stabilize at 2-ended L & R1 then the Re-configuration setting will be
updated.
If the relay configuration is 3-ended and the new setting is 2-ended L & R2 then the relay
reacts similarly to a 2-ended L & R1 reconfiguration.
If the relay configuration is 3-ended and the new setting is 2-ended R1 & R2 then the relay
reacts similarly to a 2-ended L & R1 reconfiguration.
2.1.19 Energization reconfiguration
This type
of configuration occurs when a relay is energized and the relay attempts to go into
a configuration compatible with the other relays in the scheme. As far as possible the
scheme will go to that which the user set up. There are, however, certain conditions which
may prevent this from occurring.
The configuration that the relay takes up at power on is governed by the following factors:
1. The scheme currently configured on the remote relays
2. The status of the communication links
3. The configuration stored in non volatile memory before power down
Upon energization of a relay, the following events occur:
4. The relay checks whether any messages are arriving. If so then the configuration
command in the first messages to arrive will be used as the relay configuration. This is
subject to certain conditions. If the relay has a choice of 2-ended and 3-ended, it will
assume the 2-ended scheme unless both incoming commands are 3-ended. If all three
relays are 3-ended then they will remain so.
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