Understanding how to perform electrical fault calculations is not necessary if your primary goal is to simply test relays. However, if you want to truly understand the electrical systems, how relays work, and why they do the things that they do; understanding electrical fault calculations is an excellent starting point. This video
Instrument transformers are specially designed to transform high system voltages and currents into smaller voltages and currents for remote metering and protection. Instrument transformers can be extremely accurate to allow the relay to protect the electrical system and still be isolated from dangerously high currents and voltages.I wrote and co-wrote some
Line distance (21) protection is primarily used to protect transmission lines or other electrical equipment where the equipment’s impedance characteristic can be calculated or modeled with software applications. The protective relay calculates the ratio of measured voltage and current and uses Ohm’s Law to continually monitor the measured impedance while energized. The measured impedance
Instantaneous overcurrent (50) and time overcurrent (51) protection can protect equipment from overloads and short circuits, but there are situations where their ability to protect a system is limited. Many applications exist where the direction of current is not fixed because of multiple sources and/or parallel feeders. These situations prevent
I’m reviewing information for the next book in The Relay Testing Handbook series and came across this Youtube channel. This is a dated, but excellent, video introduction to overcurrent protection (50/51) relays that has some great information to help you understand protective relays. The video reviews the basics of overcurrent protection
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