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Nieaf-Smitt PHA 3300 Manual

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SECTION VI THEORY OF OPERATION
Utrecht
- Page
57 - Ref 001
Example 1:
The Instrument will be set to log for 7 days.
The requirement is to monitor both voltage and current changes, and harmonic
distortion, with as much detail as possible.
For optimum memory usage, just 12 channels should be set for periodic analysis.
U
1, U2, U3, I1, I2, I3, thdU1, thdU2, thdU3, thdI1, thdI2, thdI3.
With this setting, the Instrument can save 24,771 records (values for 24,771 IPs).
Increasing number of channels and/or enabling Statistical Analysis would
decrease number of saved IPs.
Rnmax = (2032) * 1024 / (12 + 12 * 6) = > 24,771
(Record Length = 12 + 12 * 6 = 84 bytes)
Thus, over a week (604,800 seconds) instrument can save a record every
30 seconds (an IP interval of 30 seconds).
604,800 seconds / 24771 = 24.4 seconds Set IP = 30 seconds
Thus, monitoring the above 12 parameters with an IP of 30 seconds will produce
20,160 records per week in memory. This will leave the following memory free:
FREE Memory = Memory Capacity - Memory Used
2032 * 1024 - 20,160 * 84 bytes
387,328 bytes.
This ‘FREE Memory’ is enough for recording 2361 Voltage Anomalies. Adding
a further channel to the recording (e.g. frequency) would leave the following
memory free:
FREE Memory = Memory Capacity - Memory Used
2032*1024 - 20,160 * (84 + 12)
145,408 bytes. (Sufficient for 886 Voltage Anomalies)
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 41st, requiring 40 channels (all possible harmonics
from the 2nd to the 41st 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:
Rnmax = (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:
… 58


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