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Table 4-2 Total Data Log Ability
Number of parameters per record
1
4
8
16
4.15.3 High-speed Waveform Logging
The high-speed waveform logging partition is primarily meant to store disturbed
waveforms upon operating the disturbance trigger. With this trigger, waveform
capture and recording can be made at one cycle resolution with respect to the event.
When using the disturbance trigger, the user can specify the number of cycles to be
recorded prior to the event occurrence. The number of post-event cycles will be
adjusted automatically.
The user can run high-speed waveform logging on any other trigger, but all
measured parameters can provide a much slower response, and the instrument may
not guarantee that the event that caused the trigger to operate will exist within the
waveform buffer at the time that waveform recorder runs. In this case, recorded
waveforms might provide only post-event data.
Each waveform log record stores at once 6 waveforms × 16 cycles (voltage and
current on all three phases) sampled simultaneously at a rate of 32 samples per
cycle. Each record is provided with date and time stamp at a 0.01 second resolution,
and stores reference sampling frequency at which waveforms were sampled. Table
4-3 shows the maximum amount of data that can be recorded in the waveform log
partition assuming the entire memory allocated for waveform log. By factory setting,
the memory module is configured for storing 8 waveform records.
Table 4-3 Total Waveform Log Ability
Record size, byte
6240
Operation Techniques
Number of records Number of waveforms
82
Record size, byte
12
24
40
72
492
Memory
module
512 K
81
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