SGP311 Directional Over Current Relay Connections

[@NiteshKumarElectrical]

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.

[@amitkumarsingh5822]

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

[@abudhakir9403]

thank you very much sir

[@anupampaul3288]

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

[@himakshivyas5687]

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

[@tesla369f8]

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

[@tesla369f8]

@@lecturesinelectricaleng Thank you sir... Thank you for your quick response

[@electricallearnings3735]

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.

[@surendrakverma555]

Very good 🙏🙏🙏🙏🙏🙏🙏

[@farial1229]

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

[@rathakrishnan05]

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

[@Shadow-ex7eh]

Sir please tell which reference book you are using ?

[@Shadow-ex7eh]

Thank you so much sir for deatailed n quick response.can you suggest any one or two books which cover most of the topics of power systems protection.

[@alpachauhan4527]

Sir I want to know about characteristics angle

[@nagarajs819]

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

[@nagarajs819]

Help me to find out the directions sir...

[@pikuroy3084]

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)?

[@pikuroy3084]

@@lecturesinelectricaleng thank u sir , it will be very much helpful if you can explain the case where directional relay is used to prevent reverse power flow

[@Dhinakar_21]

@@pikuroy3084 Sir said that, we use a stopper to prevent from reverse direction. Thereby we can achieve that

[@krishnasimhavemulapalli7124]

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

[@pikuroy3084]

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?

[@mummarfarook8213]

Feeder is not highly inductive load .. because it has resistive part is very high such a way it is designed

[@gnyanankursonowal7991]

👏👏

[@choudharinileshbhai6436]

👍👍👍👍

[@himanshu2232]

Thanks sir