Protective relays -- demo unit (SEL-501 relay time overcurrent trip)

[@aljohnson3717]

By far you are the best teacher your lucky students could have ever had! Great job!

[@fohdeesha]

great narration, clear and concise

[@aljohnson3717]

One little correction. At 3:43 you call TD is 3 seconds. This is not exactly correct, since its unitless number, three in this particular case. You will have operation time (in seconds or cycles of 60Hz) calculated based on the formula provided.

[@georgechoquette5735]

Well explained. Thanks

[@MD-cd7em]

GOOD VIDEO

[@gpadepedro]

Could you post the connection diagrams of this setup please. This would help me lot. Thanks and keep it up.

[@jyotielectrical7393]

ua-cam.com/video/N9S34Iacntc/v-deo.html

[@ricardogalicia322]

What happens if we have a CT ratio of 1:1

[@aljohnson3717]

Then the Device PU Current will be 51PP*CTR = 3Amps*1 = 3Amps. Hope this helps.

[@ricardogalicia322]

@@aljohnson3717 Thanks!

[@salmaakther4478]

Could you post the connection diagrams of this setup please. This would help me lot. Thanks and keep it up.