Schweitzer Engineering Laboratories SEL-311C - Table 6.1 Relay Word Bit and Front-Panel Correspondence to Reclosing Relay States

6.12
SEL-311C Relay Instruction Manual Date Code 20060320
Close and Reclose Logic
Reclosing Relay
The reclosing relay is in one (and only one) of these states (listed in Tabl e 6.1)
at any time. When in reset or lockout, the corresponding Relay Word bit
asserts to logical 1, and the LED illuminates. Automatic reclosing only takes
place when the relay is in the Reclose Cycle State.
Lockout State
The reclosing relay goes to the Lockout State if any one of the following
occurs:
➤ The shot counter is equal to or greater than the last shot at the
time of reclose initiation (e.g., all automatic reclosing attempts
are unsuccessful—see Figure 6.6).
➤ Reclose initiation is unsuccessful because of SELOGIC control
equation setting 79RIS (see Reclose Initiate and Reclose
Initiate Supervision Settings (79RI and 79RIS, Respectively) on
page 6.17).
➤ The circuit breaker opens without reclose initiation (e.g., an
external trip).
➤ The shot counter is equal to or greater than last shot, and the
circuit breaker is open (e.g., the shot counter is driven to last
shot with SEL
OGIC control equation setting 79DLS while open
interval timing is in progress. See Drive-to-Lockout and Drive-
to-Last Shot Settings (79DTL and 79DLS, Respectively) on
page 6.19).
➤ The close failure timer (setting CFD) times out (see
Figure 6.1).
➤ SELOGIC control equation setting 79DTL = logical 1 (see
Drive-to-Lockout and Drive-to-Last Shot Settings (79DTL and
79DLS, Respectively)).
➤ The Reclose Supervision Limit Timer (setting 79CLSD) times
out (see Figure 6.2 and top of Figure 6.3).
➤ A new reclose initiation occurs while the reclosing relay is
timing on an open interval (e.g., flashover in the tank while
breaker is open).
The OPEN (OPE) command is included in the reclosing relay logic via
SEL
OGIC control equation settings. For example:
79DTL = … + OC (drive-to-lockout)
Relay Word bit OC asserts for execution of the OPE command. See OPE
Command (Open Breaker) on page 10.36 for more information on the OPE
command. Also, see Drive-to-Lockout and Drive-to-Last Shot Settings
(79DTL and 79DLS, Respectively).
Table 6.1 Relay Word Bit and Front-Panel
Correspondence to Reclosing Relay States
Reclosing Relay State
Corresponding
Relay Word Bit
Corresponding
Front-Panel LED
Reset 79RS RS
Lockout 79LO LO