Date Code 20090730 Instruction Manual SEL-734 Meter
Section 6
Power Quality and Event Analysis
Overview
The SEL-734 Meter offers three styles of event reports:
➤ Waveform Capture Event Reports
➤ Sequential Events Recorder (SER) Report
➤ Sag/Swell/Interruption (SSI) Report
Waveform Capture
Event Reports
Waveform capture, also known as oscillography, allows the SEL-734 to record
the voltage and current waveforms associated with programmable trigger
conditions, such as a voltage interruption. The sample rate and duration of the
waveform capture are predetermined using Event Report settings. The
supported sample rates are 1 kHz and 8 kHz. Use of the 8 kHz sample rate
will capture harmonic content up to the 50th order. The 1 kHz sample rate will
contain harmonic content up to the 7th order.
The duration of the waveform capture can be set to 0.25, 0.5, or 1 second.
Each waveform capture will contain at least 4 cycles of pretrigger data. The
number of waveform captures stored in memory will be determined by the
sample rate, duration, and the SEL-734 hardware configuration. The meter
stores the most recent waveform capture in nonvolatile memory. If more
waveform captures are triggered, the latest waveform capture overwrites the
oldest waveform capture.
The SEL-734 provides an option to generate 15-cycle at 16-samples per cycle
event reports. These reports are filtered to provide fundamental-only
waveforms—harmonics and interharmonics are filtered out. These reports
show information for 15 continuous cycles—4 cycles of prefault data followed
by 11 cycles of fault data. The event reports contain date, time, currents,
voltages, frequency, and Meter Word bits.
Automated Event
Report Retrieval
The ACSELERATOR Report Server software, SEL-5040, automatically
retrieves, databases, and displays SEL-734 Event Reports. The Report Server
software integrates with the SEL-734, which automatically sends new event
reports to the SEL-5040 software allowing near instantaneous display of event
waveforms. For additional information on the
ACSELERATOR Report Server
SEL-5040 software, please contact your SEL Sales Representative.
Sequential Event
Recorder (SER)
Report
The meter adds lines in the sequential events recorder (SER) report for a
change of state of a programmable condition. The SER lists date and
time-stamped lines of information each time a programmed condition changes
state. The meter retains a minimum of 682 of the most recent SER entries in
nonvolatile memory (see Make Sequential Events Recorder (SER) Settings
With Care on page 6.8). If the report fills up, newer rows overwrite the oldest
rows in the report. See Figure 6.4 for an example SER report.
Courtesy of NationalSwitchgear.com
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