Date Code 20010731 Event Reports and SER 10-3
SEL-352-1, -2 Instruction Manual
Event Report Triggering
The SEL-352 Relay saves an event report in nonvolatile memory when any of the following
occur:
Relay Word bit 86BFT asserts
Relay Word bit MER asserts
You execute the TRIGGER command
The relay generates a second event report as a continuation of the first if either of the MER or
86BFT bits did not assert at the time of the first trigger but asserted at the end of the first event
report. This function is intended to trigger a second event when the MER generated the first
event, but the 86BFT also asserts sometime during the event. In this case, the second event will
provide the necessary information to verify bus clearing times.
Relay Word Bit 86BFT
Any assertion of the 86BFT bit triggers an event report. The 86BFT SEL
OGIC control equation
setting controls the 86BFT bit. Use the SHO A 86BFT <ENTER> command to view this
setting. This setting typically is assigned to the latch output. The latch typically is set to follow
the M86T equation, which usually is assigned to the failure output elements of the individual
protection logic. The relevant settings for the default relay settings follow:
M86T = FBF + LBF + TTF + CTF + FOBF + UBBF asserts M86T bit
L3MS = M86T asserts L3MQ bit
86BFT = L3MQ asserts 86BFT bit
Figure 10.1: Typical 86BFT Assertion
The assertion of Relay Word bit 86BFT automatically triggers an event report.
Triggering of 86BFT is rising-edge sensitive (logical 0 to logical 1 transition). For example, if
86BFT asserts because latch L3MQ is asserted, an event will be triggered. The 86BFT Relay
Word bit cannot trigger another event until it deasserts and another rising edge is detected.
Relay Word Bit MER
The MER element is processed every 1/8 cycle. Trigger automatic event reports using the MER
SEL
OGIC control equation setting. The trigger time stamp accuracy is ±2 ms. The MER setting
equation controls the MER Relay Word bit. MER is set to trigger event reports for conditions
other than 86BFT tripping conditions. The factory settings are:
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