Schweitzer Engineering Laboratories SEL-351 - Observe Shot Counter Operation; Reset Timer

6-18 Close and Reclose Logic Date Code 20001006
SEL-351 Instruction Manual
Observe Shot Counter Operation
Observe the reclosing relay shot counter operation, especially during testing, with the front-panel
shot counter screen (accessed via the OTHER pushbutton). See Functions Unique to the Front-
Panel Interface in Section 11: Front-Panel Interface.
Reset Timer
The reset timer qualifies circuit breaker closure before taking the relay to the Reset State from the
Reclose Cycle State or the Lockout State. Circuit breaker status is determined by the SELOGIC
Control Equation setting 52A. (See Close Logic earlier in this section for more discussion on
SELOGIC Control Equation setting 52A. Also see Optoisolated Inputs in Section 7: Inputs,
Outputs, Timers, and Other Control Logic for more discussion on SELOGIC Control Equation
setting 52A.)
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.
It is also the reset time used in sequence coordination schemes [see Sequence Coordination
(79SEQ) discussed later in this subsection].
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 SELOGIC 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). SELOGIC Control Equation setting 79BRS (block reset timing)
can be set to control reset timing [see Block Reset Timing Setting (79BRS) later in this
subsection].
Courtesy of NationalSwitchgear.com