Schweitzer Engineering Laboratories, Inc. (SEL) has introduced new features in the SEL-701 motor protection relay. These features include Acselerator QuickSet SEL-5030 software support and a ...

PULLMAN, WA — September 26, 2013 — Schweitzer Engineering Laboratories, Inc. (SEL) today announced the introduction of the SEL-710-5 Motor Protection Relay, which protects both synchronous and ...

Thanks to ongoing innovations in technology, electrical engineers' approach to motor protection has changed over the years. The traditional strategy to large AC motor protection (e.g., over 500 hp), ...

Electric motors are the workhorses of industry and are extensively used to convert electrical energy into rotational mechanical energy. Squirrel cage induction motors, particularly the TEFC type ...

Motor protection relays are used in HVAC systems to control fan motors of the condenser, evaporator, cooling tower motor, and compressor motors. Therefore, the growth of the global motor protection ...

- Relays by protection type: overcurrent relays, under-frequency relays, polarized or directional relays, phase sequence or differential relays, distance or impedance relays, Buchholz relays, pilot ...

Medium-voltage motors are critical to a facility’s power system. Not only are they expensive, but their failure can have crippling, long-lasting impacts on a plant’s operation. As such, properly ...

Undercurrent protective relays and monitoring relays are devices designed to monitor electrical circuits and detect when the current falls below a predetermined threshold. When this occurs, the relay ...

• Ideal for retrofitting from electromechanical relays• Maintenance setting to reduce Arc-Flash Hazards• Communication capabilities enable remote monitoring and data loggingMore information, specs, ...

Solid-state relays (SSRs) serve the same functions as electromechanical relays but are non-moving noncontact devices that can switch voltages to several hundred Vac for hundreds of thousands of cycles ...

My July 3 column covered the theory and operation of potential relays. This article covers potential relay ratings and specifications along with systematic troubleshooting. Here is an example of a ...