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7SR11 & 7SR12 Applications Guide

4.1.2 Auto-Reclose Example 2, simpler multishot sequence

Requirement: Settings shall provide one phase fault reclose for IDMTL overcurrent protection but should lockout

for DTL highset- and two recloses for earth fault protection but only 1 for the EF DTL highest.

Proposed settings include:

CONTROL & LOGIC > AUTORECLOSE PROT’N:

79 P/F Inst Trips: none

79 E/F Inst Trips: none

79 P/F Delayed Trips: 51-1 (50-1 is used for Hiset but does not start ARC)

79 E/F Delayed Trips: 51N-1, 50N-1

79 P/F HS Trips: none

79 E/F HS Trips: 50N-1

CONTROL & LOGIC > AUTORECLOSE CONFIG

79 Num Shots: 2 (required for E/F)

CONTROL & LOGIC > AUTORECLOSE CONFIG > P/F SHOTS

79 P/F Prot’n Trip 1 : Inst (not important as there are no Inst elements set)

79 P/F Prot’n Trip 2 : Delayed (not important as there are no Inst elements set)

79 P/F Prot’n Trip 3 : Delayed (not used as only 1 P/F reclose is executed)

79 P/F HS Trips to Lockout : 5 (not used)

79 P/F Delayed Trips to Lockout : 2 (prevents a 2

P/F reclose)

CONTROL & LOGIC > AUTORECLOSE CONFIG > E/F SHOTS

79 E/F Prot’n Trip 1 : Delayed (not important as there are no Inst elements set)

79 E/F Prot’n Trip 2 : Delayed (not important as there are no Inst elements set)

79 E/F Prot’n Trip 3 : Delayed (not important as there are no Inst elements set)

79 E/F Prot’n Trip 4 : Delayed (not used as only 2 E/F reclose are ever executed)

79 E/F HS Trips to Lockout : 2 (must be >1 but not used due to Numshots =2)

79 E/F Delayed Trips to Lockout : 5 (must be >2 but not used due to Numshots =2)

Siemens 7SR12 Argus User Manual

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