9.2
SEL-700G Relay
Instruction Manual
Date Code 20170814
Analyzing Events
Event Reporting
The SEL-700G provides Compressed ASCII event reports to facilitate event
report storage and display. SEL communications processors and the
AC
SEL
ERATOR
Analytic Assistant SEL-5601 Software take advantage of the
Compressed ASCII format. Use the CHIS command to display Compressed
ASCII event history information. Use the CSUM command to display
Compressed ASCII event summary information. Use the CEVENT command
to display Compressed ASCII event reports. See Table C.2 for further
information.
Compressed ASCII Event Reports contain all of the Relay Word bits.
Sequential Events
Recorder (SER)
The SER report captures digital element state changes over time. Settings
allow as many as 96 Relay Word bits to be monitored, in addition to the
automatically generated triggers for relay power up, settings changes, and
active setting group changes. State changes are time-tagged to the nearest
millisecond. SER information is stored when state changes occur.
SER report data are useful in commissioning tests and during operation for
system monitoring and control.
Event Reporting
Length
The SEL-700G provides selectable event report length (LER) and prefault
length (PRE). Event report length is either 15, 64, or 180 cycles. Prefault
length is 1–10 cycles for LER = 15, 1–59 cycles for LER = 64, and 1–175
cycles for LER = 180. Prefault length is the first part of the total event report
length and precedes the event report triggering point. Changing the PRE
setting has no effect on the stored reports. The relay stores as many as 4 of
the most recent 180-cycle or 17 of the most recent 64-cycle or 72 of the most
recent 15-cycle event reports in nonvolatile memory. Refer to the SET R
command in SET Command (Change Settings) on page 7.40 and Report
Settings (SET R Command) on page SET.61.
Triggering
The SEL-700G triggers (generates) an event report when any of the following
occur:
➤
Relay Word bit TRIP asserts
➤
Programmable SEL
OGIC
control equation setting ER asserts (in
Report settings)
➤
TRI (Trigger Event Reports) serial port command executes
Relay Word Bit TRIP
Refer to Figure 4.126. If Relay Word bit TRIP asserts to logical 1, an event
report is automatically generated. Thus, any Relay Word bit that causes a trip
does not have to be entered in SEL
OGIC
control equation setting ER.
Programmable SEL
OGIC
Control Equation Setting ER
The programmable SEL
OGIC
control equation event report trigger setting ER
is set to trigger event reports for conditions other than trip conditions (see
SET R in SET Command (Change Settings) on page 7.40). When setting ER
detects a logical 0 to logical 1 transition, it generates an event report (if the
SEL-700G is not already generating a report that encompasses the new
transition). The factory setting is shown in Event Report Settings on
page 4.236.
IMPORTANT:
Changing the LER
setting clears all events in memory.
Be sure to save critical event data
prior to changing the LER setting.
Содержание SEL-700G Series
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