may be triggered by a fatal error in the relay in which case it may not be possible to successfully store a
maintenance r
ecord, depending on the nature of the problem.
For more information, see the Monitoring and Control chapter.
5.8 DISTURBANCE RECORDER
The disturbance recorder operates as a separate task from the protection and control task. It can record the
w
aveforms for up to 12 calibrated analog channels and the values of up to 32 digital signals. The recording time is
user selectable. Up to 50 seconds of data can be recorded. A minimum number of 5 records with a capacity of 10
seconds each, up to a maximum of 50 records with a capacity of 10 seconds each can be set. The disturbance
recorder is supplied with data by the protection and control task once per cycle. The disturbance recorder collates
the data that it receives into the required length disturbance record. The disturbance records can be extracted by
settings application software such as MiCOM S1 Agile, which can also store the data in COMTRADE format,
therefore allowing the use of other packages to view the recorded data.
For more information, see the Monitoring and Control chapter.
5.9 FAULT LOCATOR
The fault locator uses 12 cycles of the analog input signals to calculate the fault location. The result is returned to
the pr
otection and control task, which includes it in the fault record. The pre-fault and post-fault voltages are also
presented in the fault record. When the fault record is complete, including the fault location, the protection and
control task sends a message to the supervisor task to log the fault record.
The Fault Locator is not available on all models.
5.10 FUNCTION KEY INTERFACE
The function keys interface directly into the PSL as digital input signals. A change of state is only recognized when
a k
ey press is executed on average for longer than 200 ms. The time to register a change of state depends on
whether the function key press is executed at the start or the end of a protection task cycle, with the additional
hardware and software scan time included. A function key press can provide a latched (toggled mode) or output
on key press only (normal mode) depending on how it is programmed. It can be configured to individual protection
scheme requirements. The latched state signal for each function key is written to non-volatile memory and read
from non-volatile memory during relay power up thus allowing the function key state to be reinstated after power-
up, should power be inadvertently lost.
Chapter 4 - Software Design P54A/B/C/E
72 P54xMED-TM-EN-1
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