12.28
SEL-311C Relay Instruction Manual Date Code 20060320
Standard Event Reports and SER
Sequential Events Recorder (SER) Report
Sequential Events Recorder (SER) Report
See Figure 12.6 for an example SER report.
SER Triggering
The relay triggers (generates) an entry in the SER report for a change of state
of any one of the elements listed in the SER1, SER2, and SER3 trigger
settings. The factory default settings are:
SER1 = M1P, Z1G, M2P, Z2G, M3P, Z3G, 51G, 51Q, 50P1
SER2 = IN101, OUT101, OUT102, OUT103, OUT104, LOP
SER3 = KEY, Z3RB, PTRX
The elements are Relay Word bits referenced in Table 9.5. The relay monitors
each element in the SER lists every 1/4 cycle. If an element changes state, the
relay time-tags the changes in the SER. For example, setting SER1 contains
distance and time-overcurrent element pickups. Thus, any time one of these
elements picks up or drops out, the relay time-tags the change in the SER.
The relay adds a message to the SER to indicate power up or settings change
(to active setting group) conditions:
Relay newly powered up or Relay settings changed
Each entry in the SER includes SER row number, date, time, element name,
and element state.
Making SER Trigger
Settings
Enter up to 24 element names in each of the SER settings via the SET R
command. See Table 9 .5 and Table 9.6 for references to valid relay element
(Relay Word bit) names. See the SET R command in Table 9 .1 and
corresponding Sequential Events Recorder Settings (Serial Port Command
SET R) on page SET.25. Use commas to delimit the elements. For example, if
you enter setting SER1 as:
SER1 = 51P,51G,51PT,,51GT , 50P1, , 50P2
The relay displays the setting as:
SER1 = 51P,51G,51PT,51GT,50P1,50P2
The relay can monitor up to 72 elements in the SER (24 in each of SER1,
SER2, and SER3).
Make SER Settings
With Care
The relay triggers a row in the SER report for any change of state in any one of
the elements listed in the SER1, SER2, or SER3 trigger settings. Nonvolatile
memory is used to store the latest 512 rows of the SER report so they can be
retained during power loss. The nonvolatile memory is rated for a finite
number of “writes.” Exceeding the limit can result in an EEPROM self-test
failure. An average of one (1) state change every three minutes can be
made for a 25-year relay service life.
Retrieving SER
Reports
The relay saves the latest 512 rows of the SER in nonvolatile memory. Row 1
is the most recently triggered row, and row 512 is the oldest. View the SER
report by date or SER row number as outlined in Table 12.6.
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