SEL-451-5 Protection, Automation, and Bay Control System Major Features and Benefits The SEL-451-5 Protection, Automation, and Bay Control System integrates bay control for breakers and disconnect switches with full automation and protection in one device. ➤ Protection. Customize distribution protection with multiple instantaneous and time-overcurrent elements with SELOGIC® control equations. Best Choice Ground Directional Element® logic optimizes directional element performance and eliminates the need for many directional settings. Provide comprehensive protection for two breakers with one relay. ➤ Commissioning. Rapidly commission your Bay Control with preconfigured bay arrangements. Choose among different bus configurations, including single- and dual-busbar, transfer bus, tie breaker, breaker-and-a-half, ring-bus, doublebus/double-breaker, and source transfer configurations. These bus arrangements allow easy status and control of as many as ten disconnect switches and two breakers. Additional user-selectable bay types are available via ACSELERATOR QuickSet® SEL-5030 Software that can be downloaded at selinc.com. ➤ Automation. Take advantage of enhanced automation features that include 32 programmable elements for local control, remote control, protection latching, and automation latching. Local metering on the large format front-panel Liquid Crystal Display (LCD) eliminates the need for separate panel meters. Serial and Ethernet links efficiently transmit key information, including metering data, pro- Schweitzer Engineering Laboratories, Inc. tection element and control input/output (I/O) status, IEEE C37.118 Synchrophasors, IEC 61850 GOOSE messages, Sequential Events Recorder (SER) reports, breaker monitor, relay summary event reports, and time synchronization. Apply expanded SELOGIC control equations with math and comparison functions in control applications. Incorporate as many as 1000 lines of automation logic to speed and improve control actions. ➤ Synchrophasors. Make informed load dispatch decisions based on actual real-time phasor measurements from SEL-451-5 relays across your power system. Record streaming synchrophasor data from SEL-451-5 relays for system-wide disturbance recording. Control the power system using local and remote synchrophasor data. ➤ High-impedance Fault Detection. The optional high-impedance fault (HIF) detection element operates for small current ground faults typically caused by downed conductors on surfaces such as earth, concrete or other poorly conductive materials. HIF event data are made available in standard COMTRADE format. ➤ Ethernet Access. Access all relay functions with the optional Ethernet card. Interconnect with automation systems by using IEC 61850 or DNP3 protocol directly. Use file transfer protocol (FTP) for high-speed data collection. Connect to substation or corporate LANs to transmit synchrophasors in the IEEE C37.118–2005 format by using TCP or UDP Internet protocols.

► Parallel Redundancy Protocol (PRP). Provide seamless recovery from any single Ethernet network failure, in accordance with IEC 62439-3. The Ethernet network and all traffic are fully duplicated with both copies operating in parallel. ► IEEE 1588, Precision Time Protocol. The relay shall support Precision Time Protocol version 2 (PTPv2). PTP provides high-accuracy timing over an Ethernet network. ► Digital Relay-to-Relay Communications. Enhanced Mirrored Bits® communications can monitor internal element conditions between bays within a station, or between stations, using SEL fiber-optic transceivers....

ANSI NUMBERS/ACRONYMS AND FUNCTIONS 1 Copper or Fiber Optic * Optional Feature Figure 1 Functional Diagram Schweitzer Engineering Laboratories, Inc.

Product Overview PROTECTION • Synchrophasors • Directional Overcurrent (67) • Dual Circuit Breaker Failure (50 BF) • Synchronism Check (25) • Instantaneous Overcurrent (50) • Time Overcurrent (51) • Over/Undervoltage (27/59) • Frequency (81) • Reclosing (79) • Expanded SELOGIC Control Equations • Event Reports and Oscillography • Sequential Events Recorder (SER) • Dual Breaker Condition Monitor • Station Battery Monitor • Fault Locator • Load-Encroachment Supervision Bus 3 AUTOMATION • Ethernet Communications Protocols IEC 61850 DNP3 LAN/WAN FTP Telnet PRP C37.118 Synchrophasors • Ethernet Media...

Communications-Assisted Tripping Schemes Use communications to improve tripping time for better customer service. The SEL-451-5 is the ideal relay for use in pilot-based tripping schemes. Enhanced Mirrored Bits communications with SEL fiber-optic transceivers provide 3-6 ms relay-to-relay transmission time. Among the schemes supported are the following: ► Permissive Overreaching Transfer Tripping (POTT) ► Directional Comparison Unblocking (DCUB) ► Directional Comparison Blocking (DCB) Use the SELogic control equation TRCOMM to program specific elements, combinations of elements, inputs, etc.,...

Six Independent Settings Groups Increase Operation Flexibility Selecting a group also selects logic settings. Program group logic to adjust settings for different operating conditions, such as station maintenance, seasonal operations, emergency contingencies, loading, source changes, and adjacent relay settings changes. Combined Current for Protection Flexibility In traditional relays, when protecting a line fed from two breakers, such as a breaker-and-a-half system or doublebreaker system, you needed to combine the CT inputs before connecting these inputs to the relay. The SEL-451-5 can accept...

Multifunction Reclosing With Flexible Applications attempts. Select Leader and Follower breakers directly, or use a SELogic control equation to determine reclosing order based on system conditions. Bus 2 Figure 4 Two-Breaker Reclosing With Synchronism Check Two-Breaker Control The SEL-451-5 contains analog voltage inputs for multiple sources and control inputs to indicate both breaker and disconnect position, as well as the logic required to provide full control for two breakers. This includes separate monitoring functions as well as separate elements for tripping and closing the two breakers...