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SEL manufactures high-quality cables for connecting a variety of devices. You can order cables to specific lengths to meet your needs. Each cable is quality tested to ensure reliability and proper operation.
This webinar discusses how an SEL powerMAX remedial action scheme (RAS) solution helps the bulk power system function closer to stability limits and prevents blackouts. We also cover how to operate transmission corridors m…
This webinar introduces the SEL Blueframe and Data Management and Automation applications. During the webinar, you will learn how these new solutions support your efforts in increasing system security, efficiency (ease of use), and data utilization.
It's possible to get more out of a basic feeder protection relay without adding complexity. We've combined protection, monitoring, and control in a simple, compact package in the new SEL-851 Feeder Protection Relay.
This application note provides the calculations to determine system availability or how infrequently the functionality of the SEL ICON® Integrated Communications Optical Network System is impacted by a fault or defect.
Application Note - This application note highlights some of the benefits of the SEL-2411 Programmable Automation Controller (PAC) when used as an independent control and monitoring system for primary and secondary lubrication pumps.
This application note describes SEL recommendations for wiring I/O in the euro-style connectors on SEL-2400, SEL-2200, and SEL-700 series devices.
Application Note - Many subtransmission-level power systems use three-phase on-load tap changer (OLTC) transformers and shunt capacitor banks (SCBs) to provide voltage regulation and VAR support.
Application Note - Using the SEL-735 to Display Multiple Metering Values
Application Note - Technology is changing at a rapid pace, and intelligent electronic devices (IEDs) are smarter, faster, and include features only imagined a year ago. How do you make sure you are not missing a significant cost-saving technology? How can you be sure the system you install will meet your needs well into the future?
One of the many advantages of SEL protective relays is their automatic self-testing capability. SEL relays include automated self-testing to determine the health of the device. Self-test mechanisms measure and verify that power supply voltages are within range, validate checksums of data, check the ability to read and write to memory, ensure that analog-to-digital conversion is correct, and monitor watchdog timers. A watchdog timer is normally designed to time out when a critical process, like protection, does not complete in its allocated time. For example, if a relay has a 4-millisecond processing interval, the watchdog timer might be designed to expire in 5 milliseconds. Thus a processor stall or other failure is rapidly detected and alarmed immediately.
Application Note - The standard SEL-710 Motor Protection Relay thermal model uses a constant rotor resistance during motor starting, which may overestimate the heat building up in the motor during starting. The SEL-710 slip-dependent thermal model is an improvement over the standard thermal model because it takes into account that the actual rotor resistance is being reduced as the motor slip improves during the starting sequence.
This application note identifies how harmonic detection elements in the SEL-351 and SEL-351S Protection Systems can be used to modify relay settings and improve feeder protection security during the energization of transformers.
Application Note - A human-machine interface (HMI) allows an operator to monitor and control the machines used in an automated process. Computer-based HMIs are found extensively in today’s process control systems, using graphical onscreen controls that are virtual representations of the physical switches, pushbuttons, and gauges in control panels of the past. These HMIs range from simple numerical data displays, to basic two-dimensional drawings, to complex three-dimensional renderings of the systems they control. They can trend and archive data, automate control, and advise operators when actions need to be taken.