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.
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.
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)?
@@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
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