Sel 551 - Page 178

7.18
SEL-551 Relay Instruction Manual Date Code 20110408
Standard Event Reports and SER
Example Sequential Events Recorder (SER) Event Report
q Relay powers up in the Lockout State (L) and at last shot (= 2).
Related setting:
79OI1 = . 30.000
79OI2 = . 600.000
79OI3 = 0.000
w Front-panel operation of Local bit LB1(1) enables reclosing.
Related setting:
79DTL = !LB1 +
e Front-panel operation of Local bit LB4 (4) closes the circuit breaker via
output contact OUT2 (2).
Related settings:
CL = LB4
OUT2 = CLOSE
r Input IN1(1) indicates the circuit breaker closed.
Related setting:
52A = IN1
t Relay goes to the Reset State (R), 300 cycles after the circuit breaker closes.
Related setting:
79RSLD = 300.000 cycles
Time difference: 13:45:23.258 – 13:45:18.256 = 5.002 seconds
(= 300 cycles)
y Fault starts and time-overcurrent elements 51P1T and 51G1T pick up and
start timing (p).
u Relay trips on element 50P1(1). Relay goes to the Reclose Cycle State (C).
Element 50P1 can trip because the shot = 0 (0). Output contact OUT1 (1) trips
the circuit breaker.
Related settings:
TR = ... + 50P1 * SH0 +
OUT1 = TRIP
i The circuit breaker opens (.).
o Output contact OUT1 deasserts (.) after being asserted a minimum of
9cycles.
Related settings:
TDURD = 9.000 cycles
OUT1 = TRIP
Time difference: 13:45:45.089 – 13:45:44.939 = 0.150 seconds
(= 9 cycles)
NOTE: Two set open intervals (79OI1,
79OI2) precede the first open interval
set to zero (79OI3 = 0.000). Thus, last
shot = 2.