7SR11 & 7SR12 Applications Guide
©2017 Siemens Protection Devices Limited Chapter 7 Page 37 of 48
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
nd
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)
To Next Page
Loading...
