Schweitzer Engineering Laboratories SEL-351 - Close Logic Can Still Operate When the Reclosing Relay Is Defeated; Reclosing Relay Timer Settings; Open Interval Timers

6-16 Close and Reclose Logic Date Code 20001006
SEL-351 Instruction Manual
Close Logic Can Still Operate When the Reclosing Relay is Defeated
If the reclosing relay is defeated, the close logic (see Figure 6.1) can still operate if SELOGIC
Control Equation circuit breaker status setting 52A is set to something other than numeral 0.
Making the setting 52A = 0 defeats the close logic and also defeats the reclosing relay.
For example, if 52A = IN1, a 52a circuit breaker auxiliary contact is connected to input IN1. If
the reclosing relay does not exist, the close logic still operates, allowing closing to take place via
SELOGIC Control Equation setting CL (close conditions, other than automatic reclosing). See
Close Logic earlier in this section for more discussion on SELOGIC Control Equation settings 52A
and CL. Also see Optoisolated Inputs in Section 7: Inputs, Outputs, Timers, and Other
Control Logic for more discussion on SELOGIC Control Equation setting 52A.
Reclosing Relay Timer Settings
The open interval and reset timer factory settings are shown in Table 6.2:
Table 6.2: Reclosing Relay Timer Settings and Setting Ranges
Timer
Setting (range)
Factory Setting
(in cycles) Definition
79OI1 (0.00 - 999999 cyc) 30.00 open interval 1 time
79OI2 (0.00 - 999999 cyc) 600.00 open interval 2 time
79OI3 (0.00 - 999999 cyc) 0.00 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) 300.00 reset time from lockout state
The operation of these timers is affected by SELOGIC Control Equation settings discussed later in
this section. Also see the settings sheets at the end of Section 9: Setting the Relay.
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 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 6.2, the open interval 3 time setting 79OI3 is the first open interval
time setting set equal to zero:
79OI3 = 0.00 cycles
Courtesy of NationalSwitchgear.com