Schweitzer Engineering Laboratories SEL-311C, Instruction Manual

Page: 204 / 748

6.14
SEL-311C Relay Instruction Manual
Date Code 20060320
Close and Reclose Logic
Reclosing Relay
setting CL (close conditions, other than automatic reclosing). See Close Logic
on page 6.1 for more discussion on SEL
OGIC
control equation settings 52A
and CL. Also see Optoisolated Inputs on page 7.3 for more discussion on
SEL
OGIC
control equation setting 52A.
Reclosing Relay
Timer Settings
Example open interval and reset timer settings are shown in Table 6.2 .
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 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 example 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
Thus, open interval times 79OI3 and 79OI4 are not operable. In the example
settings, both open interval times 79OI3 and 79OI4 are set to zero. But if the
settings were:
79OI3 = 0.00 cycles
79OI4 = 900.00 cycles (set to some value other than zero)
open interval time 79OI4 would still 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 example 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 timing. If the
subsequent second reclosure is not successful, the relay goes to the Lockout
State. See the example time line in
Figure 6.6 .
Table 6.2 Reclosing Relay Timer Settings and Setting Ranges
Timer Setting (range)
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,
shot 3 and shot 4 disabled
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
79CLSD (OFF, 0.00–999999 cyc) OFF reclose supervise time limit