How to Implement Logic in Protective Relays - Pushbutton Enable/Disable Using an SEL-421 Relay

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In this video we discuss how to use digital logic in modern microprocessor-based protection relays, such as the SEL-421 relay.
We go over how to program an Enable/Disable function using front panel pushbuttons and latches and show how this works in real life.
This video is excerpted from Romero Engineering Company's Protective Relay Logic online course. Check out the full course at:
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[@synapticmemoryseepage4447]

Helpful review of logic and latching and cool example of implementation.

[@edinamamudzi1775]

Please upload more, was very helpful. Upload something on ( pressing a pushbutton twice to Set and pressing the same pushbutton twice to Reset

[@romeroengineering]

Thanks Edinam! We’ll keep that in mind for future videos.

[@omersayeed9639]

very helpful. Please upload more !

[@romeroengineering]

Thanks Omer!

[@alanmoreno9074]

Your videos are the best!

[@romeroengineering]

Thanks Alan!

[@baylegend9295]

Great presentation! Thank you.

[@romeroengineering]

Glad it was helpful!

[@LoneWolfRebelRider]

It would have been nice to see you were to go into the Graphical Logic and showed the devices (PB, Gates, Latch, ETC.)

[@romeroengineering]

Hi Steven. Thanks for the feedback. Generally, I'm not a big fan of the Graphical Logic function in SEL relays, it's too cumbersome. Typically, we create logic drawings in AutoCAD instead to show the logic

[@sandrafernandez2714]

In your academy do you have any course about SEL RTAC?

[@romeroengineering]

Hi Sandra, we currently do not have any courses on SEL RTACs, although our power system protection courses do focus on SEL relays. You can always reach out to us on our course platform once you sign up with specific questions if needed.