Restricted Earth Fault (REF) Protection Basics | Example Using the SEL-487E Protective Relay 

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Love your content. I like that you give specific examples whereas other channels often just explain the general principle.

Your explanation and example is very helpful!

Many Thanks!

Really love it! Very practical.

Amazing, thanks!

Nicely explained. thanks

Thank you, sir!

Very useful as always. I only have one question, does the type of CT affect the implementation of this scheme?, I mean as this is basically a differential protection, CT's for this REF have to be px class?

Nice video up there, can you please make a video on the thermal element is configured in the 487E?

Would the only reason to change the REF50Ga value from the default only come from an unbalanced load?

pls also discuss the difference between REF,50/51G and 50/51N