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Metrel MI 2092 Power Harmonics Analyser Manual

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MI 2092 Power Harmonics Analyser Section VI Theory of operation
57
Example 2:
The same set-up as above but:
Statistical Analysis is enabled
Phase 1 voltage harmonics (as many as possible) are to be logged.
The Instrument can calculate a Statistical Analysis for all recorded parameters except
current and voltage harmonics; thus 12 channels are required for recording statistics.
A maximum of 64 channels can be selected for data logging. The settings for
Example 1 above require 12 channels, leaving 48 channels free. The Instrument can
record harmonics up to 41
st
, requiring 40 channels (all possible harmonics from the 2
nd
to the 41
st
will be recorded). Thus a total 52 channels need to be set for Periodic
Analysis.
The number of records that the Instrument can store with this setting is given by:
Rn
max
= (2032-12) *1024 / (12 + 52 * 6) = > 6384
(Record Length = 12 + 52 * 6 = 324 bytes)
Thus, if recording is required over one week (604,800 seconds), the shortest recording
interval is given by:
Interval = 604,800 seconds / 6384
94.7seconds
Thus setting an IP of 2 minutes will produce 5040 record per week in memory. This will
leave the following memory free:
FREE Memory = Memory Capacity - Memory Used
(2032 - 12) * 1024 - 5040 * 324
435,520 bytes.
This would allow recording over a further 44 hours (with no Voltage Anomalies), or for
recording 2655 Voltage Anomalies.
… 57 …


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