6-2
Close and Reclose Logic
Date Code 20011205
SEL-311B Instruction Manual
See the settings sheet in
Section 9: Setting the Relay
for setting ranges.
From Figure 6.2
Figure 6.1: Close Logic
Set Close
If all the following are true:
·
The unlatch close condition is not asserted (ULCL = logical 0).
·
The circuit breaker is open (52A = logical 0).
·
The reclose initiation condition (79RI) is not making a rising edge (logical 0 to
logical 1) transition.
·
And a close failure condition does not exist (Relay Word bit CF = 0).
Then the CLOSE Relay Word bit can be asserted to logical 1 if either of the following occurs:
·
A reclosing relay open interval times out (qualified by SEL
OGIC
control equation setting
·
Or SEL
OGIC
control equation setting CL goes from logical 0 to logical 1 (rising edge
transition).
The CLOSE command is included in the close logic in the factory settings:
CL = … + CC
Relay Word bit CC asserts for execution of the CLOSE Command. See
CLO Command (Close
Breaker)
in
Section 10: Serial Port Communications and Commands
for more information on
the CLOSE Command. More discussion follows later on the factory settings for setting CL.
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