Enter search term, product MOT number (reverse lookup or part lookup), or drawing number.
This technical presentation showcases distribution system events like conductor slaps, evolving faults, and incorrect phase tripping. We provide recommendations for best practices during testing, commissioning, and maintenance. We also provide trouble…
This webinar focuses on how an SEL Time-Domain Link (TiDL) technology solution applies to four key factors to successfully modernize substations: protection, robustness, maintainability, and cybersecurity.
This webinar focuses on the SEL-735 Power Quality and Revenue Meter with a color touchscreen display. During the webinar, you will learn how the display simplifies meter setup, data access, troubleshooting, and testing. We will provide examples of how…
This webinar focuses on the SEL-400G Advanced Generation Protection System and how it can be applied to protect generators of all sizes and types, including hydro, pumped-storage hydro, steam turbine, and combustion gas turbine generators. During the …
This recorded technical presentation provides information on the different methods used by SEL relays to track down faults on transmission lines, the pros and cons of each method, how to choose the best method based on application, and how to manually…
This recorded technical presentation provides information on directional overcurrent elements, mho distance elements, and pilot protection, including DCB, POTT, and line current differential.
In this webinar, we focus on the SEL-2411P Pump Automation Controller, the hardened, SCADA-ready solution from SEL that is designed specifically to address lift station challenges. During the webinar, you will learn how the SEL-2411P can assist you in…
This recorded technical presentation provides information on common serial, fiber optics, Ethernet, and communications architectures. This presentation provides a basic introduction to communications for participants not familiar with various physical…
Join us for a recorded technical presentation where you will learn about a basic SEL Real-Time Automation Controller (RTAC) setup for a substation, including the initial setup out of the box; acSELerator RTAC SEL-5033 Soft…
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.
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 transmission line relay misoperations, this technical paper shares practical lessons learned through experience analyzing transmission line relay event reports.
This paper analyzes real-world event report data in the interest of uncovering valuable lessons for setting and commissioning generator relays.
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.
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 presents a novel approach to frequency estimation for power system applications: frequency tracking, frequency protection, and synchrophasors. We based our algorithm on autocorrelation of the waveform or correlation of the waveform and its derivative using a freely chosen window length. Because of the averaging inherent in correlation, the method has exceptional immunity to noise. We derive, explain, and illustrate the new method with simulation results. We review advantages and attributes of the new method compared with two commonly used approaches to frequency measurement: timing between the waveform zero crossings and measuring the rate of rotation of a phasor.
This paper reviews new time-domain line protection operating principles using traveling waves and incremental quantities. We discuss operating principles of novel directional and differential elements based on traveling waves and Zone 1 distance and directional elements based on incremental quantities. This paper provides details on the actual implementation of these principles in a high-performance relay platform and shares performance results from simulations and field recordings.
This paper explores technology options for extending local-area networks (LANs) to devices in a substation yard by using wireless technology.
This paper describes an ac railway electrical distribution system and the challenges associated with the protection of its feeders.