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The SEL-451 Protection, Automation, and Bay Control System is a complete standalone system. The SEL-451 has the speed, power, and flexibility to combine complete substation bay control with high-speed breaker protection in one economical system. Use the SEL-451 as an integral part of a full substation protection, control, and monitoring solution.
TESTING PROCEDURE FOR CAPACITOR BANK PROTECTION RELAY SEL- 451 - 2 - Prepared by: Engr. Table of contents.
Reduce maintenance costs by accurately tracking the breaker operation. Monitor breaker interruption times and the accumulated breaker duty to easily determine the need for proactive maintenance. Integrate information with SCADA or automation systems through a communications processor or directly to the Ethernet port. Optional Time-Domain Link (TiDL) technology transforms the way you modernize your substation. Dual Breaker Bay Control—Meet your bay control needs with complete two-breaker control and high-speed breaker failure detection. Easily control motor-operated switches, capacitor banks, and field I/O from the front panel or remotely.
Use configurable labels to customize 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 ten 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, alarm or trip 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 the SEL-451 with low-energy analog (LEA) voltage inputs; this helps to 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 elimination of a possible point of failure.Breaker Wear Monitoring—Compare published data of the breaker’s manufacturer to the actual interrupted current and number of operations for two breakers, and create alarms accordingly. Monitor mechanical and electrical interruption time per pole, comparing average and last trip times for maintenance scheduling.TiDL Technology—Modernize your substation by applying the TiDL-enabled SEL-451 with the SEL-2240 Axion TiDL nodes. In a TiDL system, the Axion node provides remote I/O and digitizes analog signals over fiber optics for the relay. This simple and secure digital secondary system solution is easy to implement, with no external time source or network engineering required. Replacing copper with fiber increases safety, reduces costs associated with using copper, improves reliability, and limits the impact of an electromagnetic pulse.OverviewTransformer Inrush Harmonic MonitoringApply the second-, fourth-, and fifth-harmonic elements with individual threshold settings to detect transformer energization and overexcitation conditions. The output from these harmonic detection elements can be used for a variety of functions, including modification of relay settings to improve security and event reporting to make identification of transformer energization events fast and simple.Built-In Web ServerAccess basic relay information on a standard Ethernet network with the built-in web server. View relay status, Sequential Events Recorder (SER) information, metering information, and settings with easy access within a local network.
The web server access requires a relay password and is limited to read-only viewing of information.Simple Network Time Protocol (SNTP)Simplify wiring and installation by receiving a time signal over existing Ethernet networks. SNTP makes a good backup to more accurate IRIG-B time synchronization. The 5 ms accuracy is good for basic time synchronization throughout a substation.Maximize the Capability of Substation EquipmentFully load equipment by monitoring power, including thermal or rolling interval demand as well as peak demand on positive-, negative-, and zero-sequence current.
Use the full capacity of the equipment while maintaining SEL quality protection.Advanced Visualization ToolsThe SEL-451 offers a configurable human-machine interface (HMI) for easy integration into your application or operating standards. HMI tools include custom metering and status displays, direct pushbutton access, critical information alarms in chronological order, a rotating display, and timestamped SER reports. Reduce errors by automatically scrolling between one-line bay diagrams, custom metering displays, and alarms.Bay Control for Two BreakersComplete two-breaker control and breaker failure complement the versatility of the SEL-451 programmable logic to meet your bay control needs. Easily control motor-operated switches, capacitor banks, and field I/O from the front panel or remotely.
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