Schweitzer Engineering SEL-351P, Quick Start Manual

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6-18 Close and Reclose Logic Date Code 990215
SEL-351P Manual Técnico
successful reclose initiation and if no stall conditions are present [see Skip Shot and Stall Open
Interval Timing Settings (79SKP and 79STL, respectively ) later in this subsection].
If the reset timer is actively timing, RSTMN asserts to logical 1. If the reset timer is not timing,
RSTMN deasserts to logical 0. See
Block Reset Timing Setting (79BRS) later in this
subsection.
Reclosing Relay Shot Counter
Refer to Figure SECTION 6: .6.
The shot counter increments for each reclose operation. For example, when the SEL-351P is
timing on open interval 1, 79OI1, it is at shot = 0. When the open interval times out, the shot
counter increments to shot = 1 and so forth for the set open intervals that follow. The shot
counter cannot increment beyond the last shot for automatic reclosing [see
Determination of
Number of Reclosures (Last Shot) earlier in this subsection]. The shot counter resets back to
shot = 0 when the reclosing relay returns to the Reset State.
Table SECTION 6: .3: Shot Counter Correspondence to Relay Word Bits and Open
Interval Times
Shot
Corresponding
Relay Word Bit
Corresponding
Open Interval
0 SH0 79OI1
1 SH1 79OI2
2 SH2 79OI3
3 SH3 79OI4
4 SH4
When the shot counter is at a particular shot value (e.g., shot = 2), the corresponding Relay Word
bit asserts to logical 1 (e.g., SH2 = logical 1).
The shot counter also increments for sequence coordination operation. The shot counter can
increment beyond the last shot for sequence coordination [see
Sequence Coordination Setting
(79SEQ) later in this subsection].
Reclosing Relay SEL
OGIC
Control Equation Settings Overview
Table SECTION 6: .4: Reclosing Relay SEL
OGIC
Control Equation Settings
SEL
OGIC
Control
Equation Setting Factory Setting Definition
79RI TRIP Reclose Initiate
79RIS 52A + 79CY Reclose Initiate Supervision
79DTL 67N3T * OLS + (67P1 + 67G1 +
67N1) * TRIP + (!LT2 + !LT7)
* (TRIP + !52A) + 81D1T + PB9 Drive-to-Lockout