P54x/EN MR/La4 Measurements and Recording
(MR) 8-16
MiCOM P543, P544, P545 & P546
MR
‘Ch1/Ch2 No. Errored seconds’ displays the number of seconds containing 1 or more errored
or lost messages
‘Ch1/Ch2 No. Severely Errored sconds‘ displays the number of seconds containing 31 or
more errored or lost messages
(1).
Note
1
: Any severely errored seconds are ignored when working out the
minutes intervals
‘Ch1/Ch2 No. Degraded minutes’ displays the number of minutes containing 2 or more
errored or lost messages.
The number of lost messages recorded is intended as an indicator for noises under normal
communication conditions and not for recording long communication breaks. The lost
message count is accumulated by incrementing a counter when a message is rejected by
the Error code check, message length check and the sequential time tag check.
‘Max Ch 1/2 Prop Delay’ displays the maximum value of the overall propagation delay
divided by 2 when the protection communications are enabled.
‘Max Ch1/2 TxRx Time’ displays the maximum value of the absolute difference between the
Transmission and Reception propagation delay when protection communications and GPS
Sync are enabled.
The error statistics are automatically cleared on power-up. They can also be cleared using
the Clear Statistics setting in Measurements column of the menu.
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