12.31
Date Code 20080213 Instruction Manual SEL-351A Relay
Standard Event Reports and SER
Example Sequential Events Recorder (SER) Report
9, 8, 7 Instantaneous overcurrent element 50P1 picks up and asserts trip output con-
tact OUT101 to trip the circuit breaker (see Figure 5.1). Relay goes to the
Reclose Cycle State (79CY).
Related settings: TR = ...+ 50P1 * SH0
OUT101 = TRIP
6, 5, 4 Instantaneous overcurrent element 50P1 and time-overcurrent element
pickups 51P and 51G drop out as the circuit breaker interrupts fault current.
3 Input IN101 deasserts, indicating that the circuit breaker opened.
2 Trip output contact OUT101 deasserts after being asserted a minimum of
9cycles.
Related settings:
TDURD = 9.000 cycles
Time difference: 09:28:31.879–09:28:31.729 = 0.150 seconds (= 9 cycles)
Open interval 79OI1 does not start timing until trip output contact OUT101 deas-
serts.
Related settings: 79STL = TRIP
1 Close output contact OUT102 asserts for first automatic reclose.
Related settings: 79OI1 = 300.00
Time difference: 09:28:36.874–09:28:31.879 = 4.995 seconds (@
300 cycles)
SER
Row No.
Explanation
Courtesy of NationalSwitchgear.com
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