7.3
Date Code 20110408 Instruction Manual SEL-551 Relay
Standard Event Reports and SER
Standard 15-Cycle Event Reports
See Section 5: Serial Port Communications and Commands for more
information on serial port commands.
Standard Event
Report Summary
Each time the relay generates a standard 15-cycle event report, it also
generates a corresponding event summary (see Figure 7.1). Event summaries
contain the following information:
➤ Relay and terminal identifiers (settings RID and TID)
➤ Date and time when the event was triggered
➤ Event type
➤ Recloser shot count at time of trip
➤ Front-panel fault type targets at the time of trip
➤ Phase (IA, IB, IC), neutral (IN), calculated residual (3I0), and
negative-sequence (3I2) current magnitudes in amps primary
measured at the largest phase current magnitude in the
triggered event report.
The Event Report Summary shows the magnitude of the maximum phase
current calculated by the cosine filter or bipolar peak detector. When the relay
uses the bipolar peak detector value (when a phase instantaneous pickup
setting is greater than eight times nominal phase current, and the harmonic
distortion index is greater than a fixed threshold), the relay displays
pk as
shown in the Event Summary portion of the Example Standard 15-Cycle
Event Report near the end of this section (for more information on the cosine
filter and bipolar peak detector, see subsection CT Saturation Protection on
page 1.7).
This event summary information is also contained in the corresponding
standard 15-cycle event report. The identifiers, date, and time information is at
the top of the standard 15-cycle event report, and the other information
follows at the end. See Figure 7.2.
FEEDER 1 Date: 08/07/02 Time: 15:33:09.498
STATION A
Event: ER2 Shot: 2 Targets: INST A N
Currents (A Pri), ABCNGQ: 19896 pk 13088 13108 1 1154 714
Figure 7.1 Example Event Summary
If serial port setting AUTO = Y, the event summary is sent from the serial port
a few seconds after the event.
The latest 20 event summaries are stored in nonvolatile memory and are
accessed by the HISTORY command. These event summaries correspond to
the latest 20 standard 15-cycle event reports also stored in nonvolatile
memory.
Event Type
The Event: field shows the event type. The possible event types and their
descriptions are shown in the table below. Note the correspondence to the
preceding event report triggering conditions (see Standard Event Report
Triggering on page 7.1).
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