SEL-487V Data Sheet Schweitzer Engineering Laboratories, Inc.
12
Monitoring and Metering
Complete Metering Capabilities
The SEL-487V provides extensive metering capabilities
as listed in Tab le 5.
Voltage Sag, Swell, Interruption
Records
The SEL-487V can perform automatic voltage
disturbance monitoring for three-phase systems. The
sag/swell/interruption (SSI) recorder uses the SSI Relay
Word bits to determine when to start (trigger) and when
to stop recording. The SSI recorder uses nonvolatile
memory, so de-energizing the relay will not erase any
stored SSI data.
The recorded data are available through the SSI report,
which includes date, time, current, voltage, and voltage
sag/swell/interruption (VSSI) element status during
voltage disturbances, as determined by programmable
settings VINT, VSAG, and VSWELL. When the relay is
recording a disturbance, entries are automatically added
to the SSI report at one of four rates, depending on the
length of the disturbance:
➤ once per quarter cycle
➤ once per cycle
➤ once per 64 cycles
➤ once per day
Event Reporting and Sequential
Events Recorder (SER)
Event reports and SER features simplify post-fault
analysis and help improve your understanding of both
simple and complex protective scheme operations. These
features also aid in testing and troubleshooting bay
settings and control schemes. Oscillograms are available
in binary COMTRADE and ASCII COMTRADE
formats.
Oscillography and Event Reporting
In response to a user-selected internal or external trigger,
the voltage, current, and element status information
contained in each event report confirms relay, scheme,
and system performance for every fault. Decide how
much resolution analog data are necessary when an event
report is triggered: 8 kHz, 4 kHz, 2 kHz, or 1 kHz. The
relay stores from 24 seconds of data per fault at 1 kHz
resolution to 3 seconds per fault at 8 kHz resolution.
Reports are stored in nonvolatile memory. Bay settings
operational in the bay at the time of the event are
appended to each event report. The relay stores at least
five events at the maximum report length.
Event Summary
Each time the SEL-487V generates a standard event
report, it also generates a corresponding event summary.
This is a concise description of an event that includes
bay/terminal identification, event date and time, fault
location, phase voltages, fault type at time of trip, and
trip and close times.
With an appropriate setting, the relay will automatically
send an event summary in ASCII text to one or more
serial ports each time an event report is triggered.
Harmonic and THD Metering
Accurately measure harmonic current and voltage
content up to the 15th harmonic with the SEL-487V
Harmonic Metering Function. The MET H command
provides harmonic content measurement for individual
harmonics from fundamental through the 15th harmonic.
Individual harmonic content measurement is also
available as a percent of the fundamental, and the
SEL-487V also provides percent total harmonic
distortion (%THD) as an analog quantity for use in
custom protection and automation logic.
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