Tag: current protection

An important type of “accessory” relay, especially for legacy electromechanical protective relays, is the...

A form of protection against faults on long-distance power lines is called distance relaying, so named...

While 50 and 51 (instantaneous and time overcurrent) relay functions monitor line current magnitude and guard against...

One of the fundamental laws of electric circuits is Kirchhoff’s Current Law, which states the algebraic sum of...

Perhaps the most basic and necessary protective relay function is overcurrent: commanding a circuit breaker to...

In the United States, the ANSI and IEEE organizations have standardized a set of numerical codes referring to...

Circuit breakers used in residential, commercial, and light industrial service are self-tripping devices: they...

Electrical power grids primarily consist of three-phase AC circuits. This means most power lines...

Any power grid large enough to meet the demand of an entire nation must have multiple generators drawing from multiple...