10-4 Event Reports and SER Date Code 20010731
SEL-352-1, -2 Instruction Manual
MER = UBPF + LPF + FOPF + LODPF + TRIPA + TRIPB + TRIPC + CLOSE +
MCLOSE + 26CPA + 26CPB + 26CPC + 26TPA + 26TPB + 26TPC + MDT
MER is factory set with pending failure conditions, input conditions, and the MOD trip
condition. Thus, when the pending failure condition asserts, an input is received. When the
MOD tripping element (MDT) asserts, an event report is triggered.
MER triggering is rising-edge sensitive (logical 0 to logical 1 transition). For example, if a trip
input is received (TRIPA logical 0 to logical 1 transition), this receipt of a trip input will trigger
an event report. If TRIPA remains asserted and then 26TPA asserts a short time later, assertion
of 26TPA will not generate a second report. MER is already at logical 1 because of the initial
assertion of TRIPA.
TRIGGER Command
The sole function of the TRIGGER command is to generate an event report, primarily for
testing purposes. This command will trigger an event report regardless of the state of MER or
86BFT.
Event Report Setup
Event reporting has three user-selectable configurations:
Event Length
# of Events Stored
15 Cycles 40
30 Cycles 20
60 Cycles 10
Each of these configurations provides 10 seconds of total event reports. The longer the event
reports, the longer it takes to store and retrieve these reports. Neither of these processes interrupt
relay protection operation, but these processes do inhibit serial communications.
Using the SET G command, set LER = 15, 30, or 60 to designate the length of each event report
that is triggered. Each time the LER setting changes, the events clear, but the relay retains event
summaries.
Retrieving Event Reports
The EVE command displays an event report. The relay stores latest event reports in nonvolatile
memory according to the LER setting. Optional parameters are specified to determine the event
displayed and the format in which it will appear.
The entire syntax of the EVE command is as follows:
EVE n A Ss Lc<ENTER>
The parameters may be entered in any order after the three-letter command EVE, but these
parameters must be separated by spaces or commas. The following is a summary of the
parameters and some examples:
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