- Protection
Provide flexible, subcycle, low-impedance bus differential protection for various busbar topologies and sizes with the SEL-487B. Protect systems that have up to 21 three-phase bus terminals by using three relays to provide 6 three-phase differential bus zones and 3 independent check zones. To optimize protection security, the check zones supervise the system on a per-phase basis and a patented open CT detection algorithm blocks potential misoperations during open or shorted CT conditions. Directional and low-impedance differential current elements provide increased security and fast fault detection. Reduce protection costs with built-in breaker failure protection.
- Flexibility
Apply the same CT for differential protection, metering, backup relaying, or other functions. The SEL-487B Relay can use nondedicated CTs with ratio mismatches up to 10:1.
- 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. Eliminate external recorder and metering requirements with oscillographic and binary COMTRADE event reports and Sequential Events Recorder (SER) reporting.
- acSELerator QuickSet SEL-5030 Software
Develop relay settings offline, program SELogic control equations, and analyze post-fault event reports.
- Three Independent Check Zones
Improve power system availability and reliability by reducing unintentional relay operations due to failed or misaligned disconnect auxiliary contacts, and provide redundant verification of in-zone faults. Independent check zone settings offer 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 8 target LEDs and 4 operator pushbuttons, providing 24 target LEDs and 12 operator pushbuttons on the front-panel HMI.
- Time-Domain Link Technology
Apply a TiDL solution, where Axion TiDL nodes are placed in the yard close to the primary equipment to digitize discrete I/O signals and analog data and then transport them over a fiber-optic cable to the SEL-487B in the control house. This innovative technology uses point-to-point connections and a nonroutable protocol, providing a simple and secure solution. Because it does not need an external time source or Ethernet switches, it is easy to implement with no network engineering required. TiDL combines the proven protection of the SEL-400 series relays with the modularity of the Axion, reducing training requirements and providing a scalable and flexible solution. It also provides built-in time synchronization and synchronous sampling, ensuring protection is available in the relay regardless of whether or not an external time signal is available.