Schweitzer Engineering Laboratories SEL-311L, Instruction Manual, Page: 235 / 734

Date Code 20010625 Close and Reclose Logic 6-17
SEL-311L Instruction Manual
Setting 79RSD:
Qualifies closures when the relay is in the Reclose Cycle State. These closures are usually
automatic reclosures resulting from open interval time-out.
Setting 79RSLD:
Qualifies closures when the relay is in the Lockout State. These closures are usually
manual closures. These manual closures can originate external to the relay, via the CLOSE
command, or via the SEL
OGIC
control equation setting CL (see Figure 6.1).
Setting 79RSLD is also the reset timer used when the relay powers up, has individual
settings changed for the active setting group, or the active setting group is changed (see
Reclosing Relay States and Settings/Setting Group Changes earlier in this subsection).
Typically, setting 79RSLD is set less than setting 79RSD. Setting 79RSLD emulates reclosing
relays with motor-driven timers that have a relatively short reset time from the lockout position
to the reset position.
The 79RSD and 79RSLD settings are set independently (setting 79RSLD can even be set greater
than setting 79RSD, if desired). SEL
OGIC
control equation setting 79BRS (block reset timing)
can be set to control reset timing (see Block Reset Timing Setting [79BRS] later in this
subsection).
Monitoring Open Interval and Reset Timing
Open interval and reset timing can be monitored with the following Relay Word bits:
Relay Word Bits Definition
OPTMN Indicates that the open interval
timer is actively timing
RSTMN Indicates that the reset timer is
actively timing
If the open interval timer is actively timing, OPTMN asserts to logical 1. When the relay is not
timing on an open interval (e.g., it is in the Reset State or in the Lockout State), OPTMN
deasserts to logical 0. The relay can only time on an open interval when it is in the Reclose
Cycle State, but just because the relay is in the Reclose Cycle State does not necessarily mean
the relay is timing on an open interval. The relay only times on an open interval after successful
reclose initiation and if no stall conditions are present (see
Skip Shot and Stall Open Interval
Timing Settings [79SKP and 79STL, Respectively] later in this subsection).
If the reset timer is actively timing, RSTMN asserts to logical 1. If the reset timer is not timing,
RSTMN deasserts to logical 0. See
Block Reset Timing Setting (79BRS) later in this
subsection.