SEL SEL-451 Protection, Automation, and Bay Control System

SEL-451

Protection, Automation, and Bay Control System

The SEL-451 is a complete standalone system. It has the speed, power, and flexibility to combine complete substation bay control with high-speed breaker protection in one economical system.

You can use the SEL-451 as an integral part of a full substation protection, control, and monitoring solution.

It reduces maintenance costs by accurately tracking the breaker operation.

By monitoring breaker interruption times and the accumulated breaker duty, the SEL-451 helps you easily determine the need for proactive maintenance.

You can integrate information with SCADA or automation systems through a communications processor or directly to the Ethernet port.

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.

Dual Breaker Bay Control—Meet your bay control needs with complete two-breaker control and high-speed breaker failure detection. You can easily control motor-operated switches, capacitor banks, and field I/O from the relay front panel or remotely.

Configurable labels enable customization of relay controls to match your application.

Rapid Bay Control Commissioning—Choose among different bus configurations, including single- and dual-busbar, transfer bus, tie-breaker, breaker-and-a-half, ring-bus, double-bus/ double-breaker, and source-transfer configurations. These bus arrangements allow easy status and control of as many as 20 disconnect switches and two breakers.

High-Impedance Fault Detection—Detect high-impedance faults with Arc Sense technology (AST).

High-impedance faults are a common result of a downed conductor on surfaces with poor conductivity.

With AST, the SEL-451 alarms or trips for faults that produce low fault current and are undetectable with conventional overcurrent relays.

Complete Overcurrent Protection—Customize distribution protection with multiple instantaneous and time-overcurrent elements combined with SELogic control equations.

Best Choice Ground Directional Element logic optimizes directional element performance and eliminates the need for many directional settings.

Pad-Mounted Switchgear Protection—Protect pad-mounted switchgear with low-energy analog (LEA) voltage inputs; this helps you save in overall system cost by eliminating the need for amplification electronics between the line sensor and the relay.

Having fewer devices also leads to a simpler system, a reduction in labor costs, and the elimination of a possible point of failure.

Breaker Wear Monitoring—Compare published data from the breaker’s manufacturer to the actual interrupted current and number of operations for two breakers, and create alarms accordingly.

You can monitor mechanical and electrical interruption time per pole, comparing average and last trip times for maintenance scheduling.

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-451-6 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-451-6 SV relay to receive SV data from a remote merging unit via a network, or use it as an SV merging unit to publish data to remote SV relays in the control house.

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.