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The SEL-487B provides optimized, low-impedance bus differential fault detection by using high-speed, subcycle protection coupled with high-security operation for external faults. Superior protection performance is combined with integrated station automation features for seamless transition into new and retrofit applications
3 Aug 2009 Ideally, bus protection provides fast operation (~1 cycle) for any faults that occur within the protection zone. .. The SEL-487B Bus Differential and Breaker Failure Relay is a low-impedance bus differential relay. . Use the SEL-587Z Instruction Manual equation to calculate minimum internal fault operating
SEL-487B-1 Bus Differential and Breaker Failure Relay and SEL-400 Series Relays. Date Posted: 20180125 Date Code: 20180105. Download. SEL-487B-1 Bus Differential and Breaker Failure Relay. Date Posted: 20180125 Date Code: 20180105. Download. Legacy SEL-487B-0 Relay User's Guide. Date Posted:
SEL-487E-3, -4 Relay. Instruction Manual. Date Code 20140522. © 2011–2014 by Schweitzer Engineering Laboratories, Inc. All rights reserved. All brand or product names appearing in this document are the trademark or registered trademark of their respective holders. No SEL trademarks may be used without written
25 May 2011 SEL-487B. Bus Differential and Breaker Failure Relay. ? Protection. Protect bus systems with up to 18 terminals (54 CTs), 6 protection zones, and 1 additional independent check zone. To optimize protection security operator controls and simplified variable naming provide added power to SELOGIC®
SEL-487B. Bus Differential and Breaker Failure Relay. Advanced bus protection with built-in breaker failure detection. • Protect busbars with up to 21 terminals using SEL Mirrored Bits® Communications. 87. Current Differential. DFR. Event Reports. HMI. Operator Interface. LGC. Expanded SELogic® Control Equations.
Advanced zone selection logic in the SEL-487B uses disconnect auxiliary contacts to automatically reconfigure bus protection zones during disconnect switch operation. This application guide discusses how to configure the SEL-487B for a simple zone-switching bus differential application in a basic two-bus station.
7 Oct 2015 The SEL-487B provides optimized bus differential fault detection by using high-speed, subcycle protection coupled with high-security operation for external faults. Superior protection performance is combined with integrated station automation features for seamless transition into new and retrofit
The SEL-487B Relay provides bus current differential protection, circuit breaker failure protection, and backup overcurrent buses with no more than seven terminals, use one SEL-487B in a single-relay application. For buses with eight to ten .. The SEL-487B Instruction Manual shows all supported topologies. Figure 23
SEL-487E-3, -4 Relay. Instruction Manual. Date Code 20150626. © 2011–2015 by Schweitzer Engineering Laboratories, Inc. All rights reserved. All brand or product names appearing in this document are the trademark or registered trademark of their respective holders. No SEL trademarks may be used without written

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March 2018