• Protection
  Use SEL-487B Relays to protect bus systems with up to 18 terminals (54 CTs) and six protection zones. To improve protection security, use the independent check zone to supervise up to six zones and the SEL patented open CT detection logic to block potential misoperations during open or shorted CT conditions. Differential and directional current elements provide increased security and fast fault detection. Reduce protection costs with built-in breaker failure protection.
• Flexibility
  Use different ratio CTs and nondedicated CTs with the SEL-487B. Eliminate complex wiring by using CT ratios that differ by up to a factor of 10:1. Use the same CT for differential protection, metering, backup relaying, or other functions.
• Automation and Control
  Reduce project costs and simplify interconnect wiring using multiple communications protocols. Configurable operator controls and simplified variable naming provide added power to SELOGIC^® control equations.
• Monitoring and Metering
  Provide accurate, timely monitoring and metering of busbar, feeder, and substation signals. Terminal currents, breaker and disconnect positions, station dc power levels, and three-phase voltage are continuously monitored and updated.
• ACSELERATOR^® QuickSet™ SEL-5030 Software
  Develop relay settings offline, program SELOGIC control equations, and analyze post-fault event reports.
• Independent Check Zone
  Improve power system availability and reliability. Virtually eliminate unintentional relay operations due to failed or misaligned disconnect auxiliary contacts, and provide redundant verification of in-zone faults.
  Independent check zone settings provide additional flexibility for adjusting the check zone differential element.

• Advanced Open CT Detection
  Improve the security of the current differential element with patented open CT detection logic. It assures current differential bus zones will not misoperate due to terminals that can’t be properly measured.

• Enhanced Front-Panel HMI
  Improve efficiency and simplify installation with more target LEDs and operator pushbuttons. The 7U and 9U chassis have options for an additional eight target LEDs and four operator pushbuttons, providing 24 target LEDs and 12 operator pushbuttons on the front-panel HMI.

• 1 A or 5 A CT inputs
• Ethernet connection options for primary and standby connections
  • 10/100BASE-T
  • 10BASE-FL
  • 100BASE-FX
• DNP3 Level 2 Slave with dialout
• Up to four expansion I/O cards with a wide range of control input voltage options
• Rack or panel mount
• Primary configuration
  • One relay for up to six terminals and two zones
  • Two relays for up to nine terminals and three zones
  • Three relays for up to 18 terminals, six zones, and a three-phase check zone (A, B, C)
• Enhanced HMI with 24 target LEDs and 12 operator pushbuttons.

• Conformal Coating

  Protect equipment from harsh environments and airborne contaminants such as hydrogen sulfide, chlorine, salt, and moisture.
  Learn more about conformal coating.

• Bus Differential Protection
  Apply the SEL-487B in a wide variety of bus differential applications. Use existing CTs and allow for future expansion with up to 10:1 CT ratio mismatch between terminals.
• Breaker Failure Detection
  With integrated high-speed breaker failure detection for up to 18 breakers (54 poles), the SEL-487B is an effective solution for station breaker protection.
• Station Automation and Control
  The SEL-487B has programmable pushbuttons, LEDs, and LCD text and graphics that offer flexibility in applying any bus protection scheme. Coupled with MIRRORED BITS^® communications, and optional DNP3 Slave capabilities, the SEL-487B is part of a complete automation solution.
  
• Ethernet Communications
  Download event reports in seconds instead of minutes by using the optional Ethernet port with Telnet and FTP. Quickly move information with DNP3 LAN/WAN or IEC 61850 protocols.

SEL provides options to help you efficiently and safely commission and test these relays.
	Streamline commissioning by using the SEL-4391 Data Courier™ to send and retrieve settings, gather event reports, and install enhancements.
	Improve safety, save time, and reduce costs with SEL-4600 Series Test Blocks and Plugs. Use the SEL recommended standard block and plug configurations for SEL-487B Relays.

Budgetary Retail, Quantity 1: $6,830
Fully optioned price = $13,060
(Prices displayed are for planning purposes and are subject to change. Contact your SEL sales representative today for a quote on configurations and quantities to meet your needs.)

APP 487B - SEL-487B Bus Protection Relay