Alstom MiCOM P846, Technical Manual

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P846/EN OP/D Operation
(OP) 5-24
MiCOM P846
OP
2.9 Changing setting groups
The setting groups can be changed either via opto inputs or via a menu selection. In the
Configuration column if ‘Setting Group – select via optos’ is selected then optos 1 and 2,
which are dedicated for setting group selection, can be used to select the setting group as
shown in the table below. If ‘Setting Group – select via menu’ is selected then in the
Configuration column the ‘Active Settings – Group 1/2/3/4’ can be used to select the setting
group. If this option is used then opto inputs 1 and 2 can be used for other functions in the
programmable scheme logic.
OPTO 1 OPTO 2 Selected Setting Group
0 0 1
1 0 2
0 1 3
1 1 4
Note: Setting groups comprise both Settings and Programmable Scheme
Logic. Each is independent per group – not shared as common. The
settings are generated in the Settings and Records application within
MiCOM S1, or can be applied directly from the relay front panel menu.
The programmable scheme logic can only be set using the PSL Editor
application within MiCOM S1, generating files with extension “.psl”. It
is essential that where the installation needs application-specific PSL,
that the appropriate .psl file is downloaded (sent) to the relay, for each
and every setting group that will be used. If the user fails to download
the required .psl file to any setting group that may be brought into
service, then factory default PSL will still be resident. This may have
severe operational and safety consequences.
2.10 Real time clock synchronization via opto-inputs
In modern protective schemes it is often desirable to synchronize the relay’s real time clock
so that events from different relays can be placed in chronological order. This can be done
using the IRIG-B input, if fitted, or via the communication interface connected to the
substation control system.
The P846 real time clock can be synchronized by routing an opto input in PSL to Time Sync..
Pulsing this input snaps the real time clock to the nearest minute. The recommended pul
duration is 20ms to be repeated no more than once per minute. An example of the time
sync
of “Sync. Pulse” Corrected Time
se
. function is shown below:
Time
19:47:00 to 19:47:29 19:47:00
19:47:30 to 19:47:59 19:48:00
Note: The above assumes a time format of hh:mm:ss