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Schweitzer Engineering Laboratories (SEL), a global leader in power system protection, automation, and control solutions, introduced the SEL-TWFL Dual Traveling-Wave Fault Locator and 12-Channel MHz Recorder, a standalone device that provides accurate fault locating, line monitoring and high-resolution event recording.     

The device uses traveling-wave- and impedance-based methods to accurately locate faults within one tower span. The combination of these methods provides unmatched fault-locating accuracy and dependability for a variety of operating conditions and fault types. 

Like the SEL-T401L Ultra-High-Speed Line Relay, the SEL-TWFL includes line-monitoring functionality that localizes early traveling-wave activity to address potential line problems. In addition, the SEL-TWFL can monitor two lines from a single substation and is suitable for radial, two- and three-terminal applications. The device works with series-compensated lines, overhead lines, cable lines and hybrid transmission lines. For multi-ended fault-locating methods, SEL-TWFL devices exchange data over a communications channel or via communications protocols over a SCADA network. The SEL-TWFL reports fault locations locally or at a central location using a client computer.

With its ultra-high sampling rate capability, the SEL-TWFL collects data from as many as six currents and six voltages for as long as 1.2 seconds at a 1 MHz sampling rate with 18 bits of resolution. This data offers an enhanced understanding of power system high-frequency transients from faults, switching events, breaker restrikes and self-extinguishing faults.

The SEL-TWFL draws from 40 years of SEL innovation and field experience locating faults in power systems around the world. This device joins a long line of fault-locating technology, from the earliest SEL products, like the SEL-21, SEL-LFL and SEL-321, to available products, like the SEL-421, SEL-411L, SEL-T400L and SEL-T401L. As a nod to the original devices in this product family, the SEL-TWFL sports a silver faceplate like those used in the SEL-21 and SEL-LFL.

“We’re excited to be launching the SEL-TWFL,” said CEO Dave Whitehead. “With this technology, customers can reduce the time and effort spent locating faults, while increasing their understanding of events occurring on a variety of line types and benefitting from line monitoring.” 

The SEL-TWFL is now available to order. Visit the SEL website to learn more: selinc.com/products/twfl