Disturbance Recorder; Fault Locator; Function Key Interface - GE MiCOM P40 Agile Technical Manual

Chapter 4 - Software Design
may be triggered by a fatal error in the relay in which case it may not be possible to successfully store a
maintenance record, depending on the nature of the problem.
For more information, see the Monitoring and Control chapter.
5.6

DISTURBANCE RECORDER

The disturbance recorder operates as a separate task from the protection and control task. It can record the
waveforms of the calibrated analog channels, plus the values of the digital signals. The recording time is user
selectable up to a maximum of 10.5 seconds. The disturbance recorder is supplied with data by the protection and
control task once per cycle, and collates the received data into the required length disturbance record. The
disturbance records can be extracted using application software or the SCADA system, which can also store the
data in COMTRADE format, allowing the use of other packages to view the recorded data.
For more information, see the Monitoring and Control chapter.
5.7

FAULT LOCATOR

The fault locator uses 12 cycles of the analog input signals to calculate the fault location. The result is returned to
the protection 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.
5.8

FUNCTION KEY INTERFACE

The function keys interface directly into the PSL as digital input signals. A change of state is only recognized when
a key 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.
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