3660-MANUL-V01.01.00-CDC3 Operating Manual
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4.4.3
Repeating Data Capture
If a data capture has been performed with the same settings, a warning will appear stating that the capture is
the same as a previous capture. If this is correct and the same cable is being tested, then the Yes button should
be pressed to repeat the measurement. If this is not correct, then the No button should be clicked and the cable
details updated accordingly.
Figure 38
Warning when repeating data capture
4.4.4
D
ata Capture Process
There are different sequences for single and three phase capture. The data capture process collects two types
of data; Raw data and waveforms. Raw data is used to generate the phase plots. The raw data capture is a 15
second run where all the detected events are recorded. This stage will always take 15 seconds for each filter.
Waveform data is used to map the location of the fault on the cable. During the data capture process, the data
collection will switch between the two. In addition to this, the filter that is in use will also be changed to remove
as much noise as possible from the collected data. The waveform capture time is dependent on the levels of
partial discharge on the cable, and also depends on the level of background noise. If there is a quiet cable with
very little activity and very little background noise, each waveform stage may take several minutes. For a cable
with lots of partial discharge activity occurring, the waveform capture stages will be quicker.
4.4.5
Single-Phase Data Capture Sequence
For a single-phase data capture, only the data from channel 1 will be recorded, so the data capture will only
trigger on channel 1. 100 waveforms are captured with each filter for a total of 300 waveforms.
The single-phase capture sequence is shown in Table 2.
Stage
Filter
Data Type
Trigger Channel
1
Unfiltered
Raw
1
2
Unfiltered
Waveforms
1
3
Filter 1
Raw
1
4
Filter 1
Waveforms
1
5
Filter 2
Raw
1
6
Filter 2
Waveforms
1
Table 2
Single-phase capture sequence
