Schweitzer Engineering Laboratories SEL-351 - Reclosing Relay States and General Operation

Date Code 20001006 Close and Reclose Logic 6-13
SEL-351 Instruction Manual
The reclose enable setting, E79, has setting choices N, 1, 2, 3, and 4. Setting E79 = N defeats the
reclosing relay. Setting choices 1 through 4 are the number of desired automatic reclosures (see
Open Interval Timers that follows in this subsection).
Reclosing Relay States and General Operation
Figure 6.5 explains in general the different states of the reclosing relay and its operation.
Figure 6.5: Reclosing Relay States and General Operation
Table 6.1: Relay Word Bit and Front-Panel Correspondence to Reclosing Relay States
Reclosing Relay State
Corresponding
Relay Word Bit
Corresponding
Front-Panel LED
Reset 79RS RS
Reclose Cycle 79CY CY
Lockout 79LO LO
The reclosing relay is in one (and only one) of these states (listed in Table 6.1) at any time. When
in a given state, the corresponding Relay Word bit asserts to logical 1, and the LED illuminates.
Automatic reclosing only takes place when the relay is in the Reclose Cycle State.
Courtesy of NationalSwitchgear.com