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This webinar focuses on the new SEL-RP50 Fault Repeater and SEL-FT50 and SEL-FR12 Fault Transmitter and Receiver System, a simple and cost-effective solution for utilities to enhance distribution protection. During the webinar, you will learn about …
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.
This webinar explains CT saturation in an intuitive way using simple animations and avoiding complex math and physics. We examine symmetrical and asymmetrical saturation, remanence, the equivalent circuit of a CT, and CT excitation graphs. We also…
This webinar focuses on how SEL powerMAX commercial microgrids provide greater resiliency, seamless islanding from and reconnection to the bulk electric system, and simultaneous energy storage management—maximizin…
Through analysis of event reports recorded by relays, this paper will present several examples of settings that led to unintended operation of distribution protection, including transformer delta-winding residual overcurrent protection, transformer high-voltage phase overcurrent protection, and others.
In the interest of reducing transformer differential misoperations, we share in this technical paper practical lessons we have learned through experience with commissioning and relay event report analysis.
This paper discusses how to use event data (voltages, currents, and fault location) from relays at two ends of a transmission line to calculate positive-, negative-, and zero-sequence line impedances. Impedances calculated from real event data can be used to validate relay settings and short-circuit models.
In the interest of reducing transmission line relay misoperations, this technical paper shares practical lessons learned through experience analyzing transmission line relay event reports.
This paper investigates several real-world events with data from both motor starting reports and event records. The data demonstrate the value of having devices capable of recording motor data during starts and fault events and of capturing and reviewing such data for the purpose of determining root cause.
This paper analyzes real-world event report data in the interest of uncovering valuable lessons for setting and commissioning generator relays.
This case study, focused on Alabama Power, describes a topology-based coordination scheme that leverages the utility's high-speed communications infrastructure to provide advanced distribution protection.
This paper shares details about an event and its root cause, contrasts distance and fault identification algorithms, demonstrates methodical analysis techniques, and proposes solutions. This paper also highlights that engineers face the challenge of always staying current with their experience and understanding of the “state-of-the-art.” The paper challenges engineers to do the right thing, find root cause, and solve problems.
This paper discusses the coordination of the characteristics and the backup and redundancy possible with microprocessor relays.
In this paper, we describe the causes of simultaneous faults on distribution feeders and discuss overcurrent protection coordination problems caused by these faults.