P54x/EN ST/La4 Settings
(ST) 4-8
MiCOM P543, P544, P545, P546
ST
Setting range
Menu text Default setting Step size
Min. Max.
Baud Rate Ch 2 64kbits/s 56kbits/s or 64kbits/s
As ‘Baud Rate Ch1’ cell.
Clock Source Ch1 Internal Internal or External
Setting that defines which clock source is used to synchronize data transmissions over
channel 1. The setting will depend on communications configuration and external clock
source availability. If relays are connected direct fiber over channel 1, ‘Internal’ setting
should be selected. If channel 1 is routed via a multiplexer, eithe e required
(see otes).
r setting may b
Application N
Clock Source Ch2 Internal Inte r Externarnal o l
Setting that matches the clock source being used for data synchronization over channel 2.
Ch1 N*64kbits/s 1 Auto, 1, 2, 3, …..or 12
Setting for channel 1 when connected to MUX. When set to ‘Auto’ P54x will configure
itself to match the multiplexer.
The setting is visible only when IEEE C37.94 Comm Mode is selected.
Ch2 N*64kbits/s 1 Auto, 1, 2, 3, …..or 12
Setting for channel 2 wh onnected to Mux. en c
The setting is visible only when IEEE C37.94 Comm Mode is selected.
Comm Delay Tol 0.00025 s 0.00025 s 0.001 s 0.00005 s
If successive calculated propagation times exceed this time delay setting, the relay w
initiate a cha
ill
nge in relay setting for a short time period ( “Char Mod Time” setting) and will
raise a Comm Delay Alarm.
Comm Fail Timer 10 s 0.1 s 600 s 0.1 s
Time delay after wh
were received during the ‘Cha
ich the ‘Channel Fail Alarm’ will be issued providing that no messages
nnel Timeout’ period or the ‘Alarm Level’ is exceeded.
Comm Fail Mode Ch 1 and 2 Fail
Ch 1 Failure/ Ch 2 Failure/ Ch 1 or Ch 2
Fail/ Ch 1 and Ch 2 Fail
Fail mode
Redundan
setting that triggers the ‘Chann al
cy or 3 ended scheme is set.
ical OR
However ys in a 3 e tely operated in
el Fail Alarm’, providing that the Du
Normally the alarm would be raised for any loss of an operational channel (log
combination). , when rela nded scheme are delibera
Chain topology AND logic may be used, for indication when the scheme becomes finally
inoperative, with no self-healing (signal rerouting) mode possible.
GPS Sync Disabled Enabled or Disabled
To enable (activate) or disable (turn off) the time alignment of current vectors via GPS.
Char Mod Time 0.5 s 0 2 s 0.0001 s
Time delay during which the setting characteristic k1 is increased to 200% after
tting successive calculated propagation delay time exceed the time delay se
Comm Delay Tol.
Prop Delay Equal No Operation No operation or Restore CDiff
If a P54x relay working with GPS sample synchronization loses GPS and there is a furt
switch in the protection communications network, the relay becomes Inhibited. If GP
her
S
emove the
it can be
t the communication receiver and transmitter path delays are equal.
become active again, the relay will automatically reset. But if not, the user can r
inhibited condition by using this setting. This should only be performed if
guaranteed tha
The setting is invisible when GPS Sync mode is disabled.
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