Brainfiller Videos

Per Unit System and Symmetrical Components are used for many short circuit calculations. Electric Utility Data is also often provided in terms of Per Unit and Symmetrical Components. Watch this

The Electro Mechanical Protective Relay was once the backbone of higher voltage electrical power distribution systems. Although digital relays are used today, there remains a high percentage of older equipment

Arc flash calculations assume the door is open. This arc flash video shows why. Although not an extreme amount of short circuit current for this test, it is enough to

A substation next to a swimming pool created grounding and electrical safety questions for Jim Phillips as he and his wife were on a road trip between Los Angeles and

A 2 second maximum arc flash duration is a reasonable cut off based on IEEE 1584-2002. This is provided there is room for a person to escape during an arc

Power System Harmonics are multiples of a fundamental frequency typically 60 Hz. or 50 Hz. Non-linear loads are the biggest source of harmonics that can create serious problems on an

Arc flash studies should be simple. Jim Phillips shows how to use the incident energy to validate an arc rating selection of PPE. His approach is to perform the arc