Schweitzer Engineering SEL-351P - Reclosing Relay Timer Settings; Open Interval Timers

Date Code 990215 Close and Reclose Logic 6-15
SEL-351P Manual Técnico
Reclosing Relay Timer Settings
The open interval and reset timer factory settings are shown in
Table SECTION 6: .2:
Table SECTION 6: .2: Reclosing Relay Timer Settings and Setting Ranges
Timer
Setting (range)
Factory Setting
(in cycles) Definition
79OI1 (0.00 - 999999 cyc) 300.00 open interval 1 time
79OI2 (0.00 - 999999 cyc) 600.00 open interval 2 time
79OI3 (0.00 - 999999 cyc) 600.00 open interval 3 time
79OI4 (0.00 - 999999 cyc) 0.00 open interval 4 time
79RSD (0.00 - 999999 cyc) 1800.00 reset time from reclose cycle state
79RSLD (0.00 - 999999 cyc) 600.00 reset time from lockout state
The operation of these timers is affected by SEL OGIC Control Equation settings discussed later in
this section. Also see the settings sheets at the end of Section 9: Setting the SEL-351P
Recloser Control.
Open Interval Timers
The reclose enable setting, E79, determines the number of open interval time settings that can be
set. For example, if setting E79 = 3, the first three open interval time settings in
Table SECTION
6: .2, are made available for setting.
If an open interval time is set to zero, then that open interval time is not operable, and
neither are
the open interval times that follow it.
In the factory settings in
Table SECTION 6: .2, the open interval 4 time setting 79OI4 is the first
open interval time setting set equal to zero:
79OI4 = 0.00 cycles
Thus, open interval time 79OI4 is not operable. In the factory settings, open interval time 79OI4
is set to zero. But if the settings were:
79OI3 = 0.00 cycles
79OI4 = 900.00 cycles (set to some value other than zero)
both open interval time 790I3 and 79OI4 would both be inoperative, because a preceding open
interval time is set to zero (i.e., 79OI3 = 0.00).
If open interval 1 time setting, 79OI1, is set to zero (79OI1 = 0.00 cycles), no open interval
timing takes place, and the reclosing relay is defeated.
The open interval timers time consecutively; they do not have the same beginning time reference
point. In the above factory settings, open interval 1 time setting, 79OI1, times first. If the
subsequent first reclosure is not successful, then open interval 2 time setting, 79OI2, starts