A transformer protection relay does not replace upstream devices. It defines responsibility. By clearly assigning fault ...

Each data center is unique but contains a generic layout[1] consisting of three main systems, namely: a) the electrical system; b) the mechanical system; and c) the information technology (IT) system.

Arc flash is defined as an explosive release of energy caused by an electrical arc. Typically, the arc results from either a phase-to-ground or phase-to-phase fault created by many possible events.

Have you ever found yourself faced with an electrical task that involves a potential arc flash hazard, and the first question you ask is: “What level of personal protective equipment (PPE) do I need ...

The PGR-8800 is a microprocessor-based protection relay that limits arc-flash damage by using light sensors to rapidly detect the arc and then trip a circuit breaker. Phase current-transformer inputs ...

In a typical television transmitter installation 30 years ago — at a time when big power was coming into play (three-phase, 460VAC) — power was fed from a transformer located just outside of the ...

Switchgear comprises electrical disconnect switches, fuses and/or circuit breakers that control, protect and isolate electrical equipment in electrical power systems. A switchgear fault (phase loss, ...

If you are responsible for facility electrical operations, you may have heard of the recent updates to IEEE 1584 “IEEE Guide for Performing Arc-Flash Hazard Calculations.” The previous major edition ...