x/EN FD/Na7
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MiCOM P74
3.5.7 Disturbance recorder
The disturbance recorder operates as a separate task from the protection and control task. It
can record the waveforms for up to 8 analogue channels and the values of up to 32 digital
signals. For peripheral unit the recording time is user selectable up to a maximum of 10
seconds and for central unit the record duration is fixed to 600ms. 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. It
attempts to limit the demands it places on memory space by saving the analogue data in
compressed format whenever possible. This is done by detecting changes in the analogue
input signals and compressing the recording of the waveform when it is in a steady-state
condition. The disturbance records can be extracted by S1 that can also store the data in
COMTRADE format, thus allowing the use of other packages to view the recorded data.
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