Schweitzer Engineering SEL-351P, Quick Start Manual

Page: 127 / 674

Date Code 990215 Factory-Set Logic 1-31
SEL-351P Manual Técnico
•
When the FECHAR operator control is set with a time delay (PB8D > 0; see Figure
SECTION 1: .35) and is timing to a pending close, the corresponding RELIGADOR
FECHADO LED flashes as a timing indication. Besides unlatching the close signal
output, the unlatch close SEL
OGIC
setting (ULCL) also prevents the FECHAR operator
control from starting to time to a pending close. The logic in the bottom-half of Figure
SECTION 1: .21 is set primarily with the task in mind of keeping the RELIGADOR
FECHADO LED from flashing, by preventing the FECHAR operator control from
starting to time for a Hot line tag ON or a BLOQUEIO operator control ON. The logic
allows the CLOSE command and auto-reclosing to still proceed, with the BLOQUEIO
operator control ON.
Hot line tag OFF
(see Figure 1.49)
Hot line tag ON
and
No close In progress
Close output contact
(see Figure 7.29)
BLOQUEIO
operator control ON
and
Serial port
CLOSE Command
BLOQUEIO operator control OFF
(see Figure 1.44)
Control in the
reclose cycle state
No close In progess
and
No CLOSE command
and
Control not in the
reclose cycle state
Trip logic output
(see Figure 5.1)
Unlatch
Close
Conditions
SEL
OGIC
Setting
ULCL
Input into close
logic (see
Figure 6.1)
This logic
prevents the
FECHAR
operator control
pushbutton from
starting a
pending close
when hot line tag
is ON or
BLOQUEIO
operator control
in ON (see
Figure 1.39)
DWG: MP351P019
Relay
Word
Bits
TRIP
LT7
WBCL
LT4
CC
79CY
WBTRT
Close output contact
(see Figure 7.29)
WBCL
Trip output with 30 cycle dropout time
(see Figure 7.29)
Figure SECTION 1: .21: Unlatch Close Conditions
Recloser Status
Recloser status is determined from a recloser 52a auxiliary contact, run through a qualifying
timer, as shown in Figure SECTION 1: .22 (see also Figure 7.29). The greater pickup delay (1
cycle) compensates for the recloser auxiliary contacts operating faster than the circuit breaker
main contacts for close operations and provides more time qualification for contact bounce.