Schweitzer Engineering SEL-351P - Reclose Initiate and Reclose Initiate Supervision Settings (79 RI and 79 RIS, Respectively); Factory Settings Example

Date Code 990215 Close and Reclose Logic 6-19
SEL-351P Manual Técnico
SEL OGIC Control
Equation Setting Factory Setting Definition
+ OC + SV16
79DLS 79LO Drive-to-Last Shot
79SKP 0 Skip Shot
79STL TRIP Stall Open Interval Timing
79BRS 51P1 + 51P2 + 51G1 + 51G2 +
51N1 + 51N2 + 67N3 + TRIP
Block Reset Timing
79SEQ 79RS * (51P1 + 51G1 + 51N1)
* SEQC
Sequence Coordination
79CLS TRCAP * CLCAP * !NOBATT *
BCBOK * !DTFAIL
Reclose Supervision
These settings are discussed in detail in the remainder of this subsection.
The longer factory settings are explained in Section 1: Factory-Set Logic.
Reclose Initiate and Reclose Initiate Supervision Settings (79RI and 79RIS, respectively)
The reclose initiate setting 79RI is a rising-edge detect setting. The reclose initiate supervision
setting 79RIS supervises setting 79RI. When setting 79RI senses a rising edge (logical 0 to
logical 1 transition), setting 79RIS has to be at logical 1 (79RIS = logical 1) in order for open
interval timing to be initiated.
If 79RIS = logical 0 when setting 79RI senses a rising edge (logical 0 to logical 1 transition), the
relay goes to the Lockout State.
Factory Settings Example
With factory settings:
79RI = TRIP
79RIS = 52A + 79CY
the transition of the TRIP Relay Word bit from logical 0 to logical 1 initiates open interval
timing only if the 52A or 79CY Relay Word bit is at logical 1 (52A = logical 1, or 79CY =
logical 1).
The recloser has to be closed (recloser status 52A = logical 1) at the instant of the first trip
operation of the auto-reclose cycle in order for the SEL-351P to successfully initiate reclosing
and start timing on the first open interval. The SEL-351P is not yet in the reclose cycle state
(79CY = logical 0) at the instant of the first trip operation.
Then for any subsequent trip operations in the auto-reclose cycle, the SEL-351P is in the reclose
cycle state (79CY = logical 1) and the SEL-351P successfully initiates reclosing for each trip
operation. Because of factory setting 79RIS = 52A + 79CY, successful reclose initiation in the
reclose cycle state (79CY = logical 1) is not dependent on the recloser status (52A). This allows
successful reclose initiation for the case of a fast curve/instantaneous trip operation, but the