SGP311 Directional Over Current Relay Connections 

Wonderful explanation Sir ! From Basic to best explanation you did..! Engineer must watch this video. Please keep on explaining all the concepts related to protections and power system study.. ! This wo help all the students and engineers also.

Wonderful explanation sir. I have one question. Where do we use a 60 degree relay (directional type)?

Hello sir, My question is - why shape of aluminium disc in over current relays is not completely spiral it is having sharp ends ?

sir why current taken in lead direction has been explained in directional relay

Sir this is 67 protection which you explain but I have seen there is 67N also and both are use with together in industrial applications. So can you make vedios for 67N.

thank you very much sir

hello sir, in case of single phase is there any special connection to get maximum amount of torque..?

Sir @15.42 u hv mentioned that 30° connection is good for fault p.f less than 60° , but my question is --- during fault the effect of line inductance become predominant & fault current lag voltage by almost 90°, so how come fault p.f less than 60° is possible?

Sir @13.40 , @ 14.10 u hv given examples where the current is lagging by 30° , 60° respectively, but here the power flow is IN POSITIVE DIRECTION as during REVERSE POWER FLOW the phase current is supposed to lead the phase voltage , so why does the relay is operating in this cases(as directional relay is meant for preventing reverse power flow only)?

Sir, In one of my site, Relay tripped with directional earth fault, in that time our fault currents are, Ir: 717A

Sir, what happened when all three phase fault occur ? How Directional relay work then?

In case of phase fault between phase-y and Phase-B, how to draw phasor digaram.

sir why cant we use non dirwctional relays every where....why use directional relay when its cost is more..anyway non directional relay operatre for any fault in any direction

Very good 🙏🙏🙏🙏🙏🙏🙏

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Sir I want to know about characteristics angle

Thanks sir

Sir please tell which reference book you are using ?

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