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1736/1738
Users Manual
44
Harmonics Spectrum Relative to Harmonic Limits
This screen is available on 1738 or 1736 with 1736/Upgrade or
IEEE519/Report license) and shows the harmonics relative to the
individual limit defined by the standard selected in the measurement
configuration. Each bar is green when the measurement is below the
individual limit for this harmonic or THD. When the standard defines
two limits, for example, a limit for 95 % of all values and a limit for 99 %
of all limits, the bar turns orange when the measurement values
comply with the 99 % limit but violate the 95 % limit. When both limits
are exceeded the bar turns red. When the standard defines only one
limit for each harmonic or THD, the bar turns from green to red when
this limit is exceeded. The number of displayed harmonics varies in
accordance with the selected standard.
The side menu in the harmonics screens has a dual use. First, select
the parameter to display and confirm with
. The selector bar jumps
to the lower section for the phase selection. The number of available
phases and the Neutral current depends on the selected topology.
See Measurement Configuration on page 23 for details. Make your
choice and confirm again with
.
Some screens do not include
(Show Menu) to access the side
menu. Use
/ instead.
Events
The Logger captures events on voltage and current. The events are
shown in a table with the columns ID, Start Time, End Time, Duration,
Event Type, Extreme Value, Severity, and Phase. Touch the arrows
left and right of the table to view all available columns. Use / to
highlight an event of interest. On the 1738 or the 1736 with
1736/Upgrade license, use
(Waveshape) and (RMS
Profile) to review the recordings triggered with the start of the event.
The voltage events are classified in dips, swells, and interruptions and
are measured according to the standard IEC 61000–4–30
"Electromagnetic compatibility (EMC) - Part 4-30: Testing and
measurement techniques - Power quality measurement methods".
According to this standard the Logger applies the polyphase event
detection on split phase and three phase systems with the exception
of the topologies 3-phase Delta balanced and the 3-phase Wye
balanced. The events are captured and reported for phase A/L1 only.
Note
The polyphase event detection simplifies the event table
because events on multiple phases are combined when they
occur at the same time or overlap. In the Energy Analyze
Plus software you can select to get either a table with
combined events using the polyphase event detection or a
table with events for each individual phase in order to review
details, like start time, end time, or the extreme value on an
individual phase of interest.
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