Schweitzer Engineering Laboratories SEL-311C - Page 413

11.7
Date Code 20060320 Instruction Manual SEL-311C Relay
Front-Panel Interface (Only on Models With LCD)
Functions Unique to the Front-Panel Interface
If neither 79LL nor 79SL is set, upon selecting function 79, the following
screen appears (shown here with demonstration settings):
These text label settings are set with the SET T command or viewed with the
SHO T command via the serial port (see Section 9: Setting the Relay and SHO
Command (Show/View Settings) on page 10.25).
The top numeral in the above example screen (
SET RECLOSURES=2)
corresponds to the “last shot” value, which is a function of the number of set
open intervals. There are two set open intervals in the demonstration settings,
thus two reclosures (shots) are possible in a reclose sequence.
The bottom numeral in the above example screen [
RECLOSE COUNT =0 (or
RECLOSE COUNT =2)] corresponds to the “present shot” value. If the breaker is
closed and the reclosing relay is reset (RS LED on front panel is illuminated),
RECLOSE COUNT =0. If the breaker is open and the reclosing relay is locked out
after a reclose sequence (LO LED on front panel is illuminated),
RECLOSE
COUNT =2
.
Reclosing Relay Shot Counter Screen Operation
With the breaker closed and the reclosing relay in the reset state (front-panel
RS LED illuminated), the reclosing relay shot counter screen appears as:
The relay trips the breaker open, and the reclosing relay goes to the reclose
cycle state. The reclosing relay shot counter screen still appears as:
The first open interval (79OI1 = 30) times out, the shot counter increments
from 0 to 1, and the relay recloses the breaker. The reclosing relay shot
counter screen shows the incremented shot counter:
The relay trips the breaker open again. The reclosing relay shot counter screen
still appears as:
=2
=2
SET RECLOSURES=2
RECLOSE COUNT =0
SET RECLOSURES=2
RECLOSE COUNT =0
SET RECLOSURES=2
RECLOSE COUNT =1
SET RECLOSURES=2
RECLOSE COUNT =1