SEL-487E

Synchrophasors
Send IEEE C37.118 synchrophasor messages over serial or Ethernet communications to detect reactive loop flows, turn state estimation into state measurement, and provide early warning of potential system instability. Apply control functions based on phase angles, currents, and voltages for basic or advanced applications. Multicast synchrophasor data to simplify system architecture and improve system operations. For applications requiring a dedicated phasor measurement unit (PMU), choose the SEL-487E-4 Station Phasor Measurement Unit.

Current Differential Protection With Two to Five Restraints
Achieve fast, sensitive, dependable, and secure differential protection. A two-stage slope adapts to internal or external fault conditions automatically, even with CT saturation and heavily distorted waveforms.

Additional Protection
Apply two three-phase voltage inputs for over- and undervoltage, frequency, synchronism check, and volts-per-hertz protection. You can make any overcurrent element directional using voltage-polarized directional elements as torque control inputs to the overcurrent elements. Adaptive time-overcurrent (IDMT) elements allow you to implement transformer and feeder backup protection. Three independent REF elements enable sensitive ground fault detection in grounded wye transformer applications.

Security and Dependability
Provide maximum security during external faults and transformer magnetizing inrush conditions. You can detect internal faults quickly, during energization or normal operating conditions, using combined harmonic-blocking and -restraint differential elements. The SEL-487E can detect turn-to-turn winding faults for as little as 2 percent of the total transformer winding with the negative-sequence differential element.

Monitoring and Asset Management
Monitor and protect critical substation assets with the IEEE C57.91 and IEC 60255-149 thermal models for mineral oil-immersed transformers. You can use the IEC thermal element to trip a breaker or use either the IEC or the IEEE thermal elements to activate a control action or issue an alarm when the transformer is in danger of excessive insulation aging or loss of life. Advanced monitoring features include transformer through fault, substation battery voltage, and comprehensive breaker wear monitoring.

Metering and Reporting
Eliminate external recorder and metering requirements with oscillographic event reports, Sequential Events Recorder (SER) reporting, and three-phase power metering. These tools simplify post-fault analysis and improve your understanding of protective scheme operations.

Flexible Communications
An Ethernet card option provides two copper or fiber ports for failover redundancy. Available Ethernet communications protocols include FTP, Telnet, DNP3 LAN/WAN, SNTP, the IEEE 1588 Precision Time Protocol Version 2 (PTPv2), IEC 61850 Edition 2, the Parallel Redundancy Protocol (PRP), and IEEE C37.118 synchrophasors.

All four independent EIA-232 serial ports support SEL Fast Message, SEL ASCII, Compressed ASCII, SEL Fast Operate, SEL Fast Meter, SEL Fast SER, enhanced SEL Mirrored Bits communications, DNP3 Level 2 Outstation plus dial-out, Virtual Terminal, and communications with SEL-2600 Series RTD Modules.

Front-Panel One-Line Diagrams Control and Monitoring
Select your own system bay configuration, and control as many as 5 breakers and 20 disconnect switches using the built-in mimic diagrams that include programmable analog quantities for readouts.

Automation and Control
Implement SELogic control equations with SELogic variables, timers, latch bits, and remote control elements for customizing advanced protection and control schemes. Control logic can replace panel control switches, RTU-to-relay wiring, latching relays, and traditional indicating panel lights.

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-487E 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 an external time signal is available.

SEL Sampled Values Technology
Implement an SEL SV solution, where the merging unit (publisher) digitizes analog signals from primary equipment and then transmits them to an SEL-487E-5 Relay (subscriber) in the control house via a fiber-based Ethernet network. The system uses precise time synchronization via IRIG-B or PTP. The SEL-487E-5 Relay offers the traditional protection available in the SEL-487E-3/-4 and can also receive SV data from devices such as the SEL-401 Protection, Automation, and Control Merging Unit or the SEL-421-7 Protection, Automation, and Control System Merging Unit. Because all SEL SV devices are compliant with IEC 61850-9-2 and the UCA 61850-9-2LE guideline, the SEL-487E-5 can be used with other manufacturers’ SV-compliant units.