Date Code 20001006 Standard Event Reports, Sag/Swell/Interruption Report, and SER
SEL-351 Instruction Manual
12-35
SER
Row No. Explanation
14, 13 Input IN1 asserts, indicating that the circuit breaker closed. Close output contact
OUT2 consequently deasserts.
Related setting: 52A = IN1
12 The relay leaves the Lockout State (79LO) and goes to the Reset State, 300 cycles
after the circuit breaker closes.
Related setting: 79RSLD = 300.000 cycles
Time difference: 13:11:43.892 - 13:11:38.887 = 5.005 seconds (= 300 cycles)
11, 10 Time-overcurrent elements 51PT and 51GT pickup and start timing at fault
inception (51P and 51G are the respective pickup indicators).
9, 8, 7 Instantaneous overcurrent element 50P1 picks up and asserts trip output contact
OUT1 to trip the circuit breaker (see Figure 5.1). Relay goes to the Reclose Cycle
State (79CY).
Related settings: TR = ...+ 50P1*SH0
OUT1 = TRIP
6, 5, 3 Instantaneous overcurrent element 50P1 and time-overcurrent element pickups 51P
and 51G drop out as the circuit breaker interrupts fault current.
4 Input IN1 deasserts, indicating that the circuit breaker opened.
2 Trip output contact OUT1 deasserts after being asserted a minimum of 9 cycles.
Related settings: TDURD = 9.000 cycles
Time difference: 09:52:15.039 - 09:52:14.889 = 0.150 seconds (= 9 cycles)
Open interval 79OI1 does not start timing until trip output contact OUT1 deasserts.
Related settings: 79STL = TRIP
1 Close output contact OUT2 asserts for first automatic reclose.
Related settings: 79OI1 = 30.000
Time difference: 09:52:15.535 - 09:52:15.039 = 0.496 seconds (= 30 cycles)
Courtesy of NationalSwitchgear.com
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