SEL SEL-487B Bus Differential and Breaker Failure Relay

SEL-487B

Bus Differential and Breaker Failure Relay

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.

Transform the way you modernize your substation with optional Time-Domain Link (TiDL) technology or Sampled Values (SV)-based technology using IEC 61850-9-2 or IEC 61869-9.

Low-Impedance Bus Differential Protection—Provide flexible low-impedance bus differential protection for various busbar topologies and sizes.

You can protect systems with up to 21 three-phase bus terminals by using three relays to provide 6 three-phase differential bus zones and 3 independent check zones.

Patented open CT detection algorithms block potential misoperations due to open or shorted CT conditions.

Integrated Overcurrent Protection—Choose from ten overcurrent curves for each current input for additional protection.

Each torque-controlled time-overcurrent element has two reset characteristics.

There is also one level of instantaneous and definite-time elements available for each current input.

Voltage Elements—Supervise current differential tripping within the relay by using voltage elements.

Three separate voltage elements consist of two levels of phase under- and overvoltage elements and two levels of negative- and zero-sequence overvoltage elements for each of the three analog voltage quantities measured.

35:1 CT Ratio Mismatch—Install the SEL-487B in a system with nondedicated CTs, with CT ratio mismatches up to 35:1.

This allows the same CTs to be used in other protection applications, such as metering or backup relaying.

Dynamic Zone Configuration—Automatically reassign current inputs to different bus zones without using auxiliary relays. The SEL-487B is suited for bus topologies that include bus-tie breakers and disconnects.

Breaker Failure Detection—Mitigate circuit breaker failure with the SEL-487B relay’s integrated circuit breaker failure detection and logic, which includes retrip capability for each terminal.

Integration and Automation—Select from an array of communications features and protocols to integrate the SEL-487B into your existing communications schemes.

The relay features EIA-232 as well as optional copper or fiber Ethernet ports to fit into an array of applications.

Protocol options include Mirrored Bits communications, DNP3 LAN/WAN, the Simple Network Time Protocol (SNTP),

the Parallel Redundancy Protocol (PRP), the IEEE 1588 Precision Time Protocol Version 2 (PTPv2), and IEC 61850 Edition 2.1.

Digital Secondary System Technologies—SEL TiDL and SV-based solutions replace copper with fiber to increase safety, improve reliability, and limit the impact of an electromagnetic pulse.

Apply the SEL-487B-2 TiDL relay with the SEL-TMU TiDL Merging Unit in the field to provide remote I/O and digitize analog signals.

This simple point-to-point solution with a strong cybersecurity posture is easy to implement.

Apply the IEC-compliant SEL-487B-2 SV relay to receive SV data from a remote merging unit via a network.

Improve system availability in SV applications with the Parallel Redundancy Protocol (PRP), the High-availability Seamless Redundancy (HSR) protocol, or seamless failover using a five-port Ethernet card.

Flexible Communications Options—Use small form-factor pluggable (SFP) transceivers on designated process bus, station bus, and engineering access ports in the five-port Ethernet card.

Choose between single- and multimode communications options for increased flexibility.

All ports support 100 Mbps SFP transceivers, and process bus ports also support 1 Gbps SFP transceivers.

Distributed Busbar Protection—Apply the SEL-487B with digital secondary system technology for a distributed busbar protection scheme.

Improve scalability by connecting up to seven terminals per device.

For devices with IEC 61850 SV capability and the five-port Ethernet card, the solution can be scaled to protect busbars with up to 21 terminals and 24 SV streams using a per-phase segregated differential scheme.