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 and provides detailed information regarding electro-mechanical relays and their functions.

I hope you find it useful!
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You have to love it when you have become nostalgia…
very thanks you