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Summary of Contents for Entec Load Break Switch
- Page 1 Application Guide www.Entec-USA.com Date: June 2018 Load Break Switch Three Phase S ectionalizer With SEL-751 Patent Pending Control Technology Version 1.0...
- Page 2 Application Guide Three Phase Sectionalizer Subject: Load Break Switch in Sectionalizing Applications ENTEC Product: Solid Dielectric Load Break Switch with Vacuum Interrupter (LBS) Sectionalizer Description Sectionalizers are used in tandem with upstream protective devices such as reclosing breakers or reclosers to automatically isolate faulted sections of distribution lines.
- Page 3 Solution 1 HIGH FAULT ISOLATION Branch-1 Fault: 52 Breaker cycles and LBS locks out … Utility Feeder remains energized Solution 2 PME PROTECTION IN HIGH FAULT ZONE PME Fault: 52 Breaker cycles, LBS locks out … Utility Feeder remains energized www.Entec-USA.com...
- Page 4 INDUSTRIAL VOLTAGE RESTRAINT WITH DOWNSTREAM RECLOSER Zone A Fault: RX1 cycles to clear fault and LBS locks out … critical SWD continues. Zone B Fault: RX2 cycles to clear fault, Voltage restraint blocks LBS count … RX2 locks out and critical SWD continues. www.Entec-USA.com...
- Page 5 PME PROTECTION WITH CUSTOMER RECLOSER PME Fault: 52 Breaker cycles, LBS locks out … Utility Feeder remains energized Solution 6 NO COORDINATION REQUIRED Weak Fault: Fuse won’t coordinate, RX2 cycles, LBS2 locks out … RX2 and Utility Feeder remain energized www.Entec-USA.com...
- Page 6 Deep Fault: RX1 cycles, LBS2 locks before LBS1, Zone-2 isolated … Zone-1 and Main Line remain energized Solution 8 INRUSH RESTRAINT Fault Cleared Upstream: RX cycles and LBS1 locks out. Inrush Restraint blocks LBS2 … Utility Feeder and LBS2 remain energized ® is a registered trademark of Schweitzer Engineering Laboratories, Inc. (SEL) www.Entec-USA.com...
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