Excellent explanation... But I have some doubts... Please clarify 1.You have presented three videos about directional relay. Where to use self polarised, cross polarised and residual voltage method. All are showing different tripping region. 2. In self polarised method you have rotated clockwise to draw MTL. In cross polarisation method you have rotated the phasor clockwise to draw MTL. In residual method again you have rotated the phasor clockwise to draw MTL. 3. In relays only RCA and PU values settings implemented. So how to find out tripping regions for relay testing. Please explain.. Thank you
1. for earthfault the direction earthfault is different then overcurrent. 2.same in earthfault the residual voltage direction change so it different form overcurrent 3.in numerical relay has both self and cross polarised method some relay we have to choose. if not they will have only one polarised method. this can be seen in manual of the relay.
Sir,Thanks a lot for clear explanation one doubt I have as per explanation R-phase to E/F in forward case V reference you took opposite to Vr same way reverse explanation 180 opposite you took that is in phase with Vr up to that it was clear . But in Y to E/F and B to E/F direction is mentioned in the drawing reverse but the fault is not in phase direction with corresponding phases so that as per my understanding it’s forward direction diagram if I wrong please explain sir.
Nice & clear explanation, however, I have doubts in the Io calculations as below: when I1 = 2.8 L 0 degree I2 = 1 L 240 degree I3 = 1 L120 degree Io should be = 0.60 L 0 degree whereas you calculated 0.6 L180 degree also there is difference when I calculate Io for faults on I2 and I3 Please explain your calculation? Thanks
at 4:30s in your video, as previous calculation V0 is 60 degrees and I0 is 180 degrees for fault of L2-ground but your diagram is they are 60 degrees same? Can you explain for me, thanks.
@@baranitech @SantoshKumar-nk5ve sir this angle (RCA) depends upon Network earthing like compensated, isolated & Solidly earthing. Here Isolated depends upon capacitance charging current when fault accrued (that is taken RCA - 90 deg lag). Compensated depends upon Capacitance & Inductance (that is RCA - 0 deg). Solidly earthing inbetween 0-90 deg). I hope this is correct & if wrong kindly clear me.
Brother... RCA angle settings how to deside.. Wether its 45 60 40...dgree, its related with earthing system... Ungrounded grounded or resistance earthing how we choose exactly... Particular angle.. Kindly make clarify... Rest of this doubts... I got some idea's from... Above videos thanks
During test the DEFLLPDEF 67n on the ABB REF615 relay, I make the same setting as u motioned on the video ,but it is not tripping in the operation region .I am confused ,can You show the full settings for the earth fault, thank you
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Sirji thank you for your valuable information
your mostly welcome
Very nice explanation.. Thanks you so much for such a nice tutorial which I was looking for....
You are most welcome
thank you very for these details
welcome lot
Excellent explanation... But I have some doubts... Please clarify
1.You have presented three videos about directional relay. Where to use self polarised, cross polarised and residual voltage method. All are showing different tripping region.
2. In self polarised method you have rotated clockwise to draw MTL. In cross polarisation method you have rotated the phasor clockwise to draw MTL. In residual method again you have rotated the phasor clockwise to draw MTL.
3. In relays only RCA and PU values settings implemented. So how to find out tripping regions for relay testing.
Please explain..
Thank you
1. for earthfault the direction earthfault is different then overcurrent.
2.same in earthfault the residual voltage direction change so it different form overcurrent
3.in numerical relay has both self and cross polarised method some relay we have to choose. if not they will have only one polarised method. this can be seen in manual of the relay.
for direction earthfaul i will check once again
Please share Hindi language too but your explanation very good best wishes
i will try in future
thank you very much
You are welcome
Thank you
You're welcome
For r phase you considered vref at 0 & 180 degree..... For y and b phase what are the angle for v ref to be considered
for y is 110 to 290 and for b its 170 to 350 . this i have show at the end of the video
@@baranitech how?
@@Mumbaindianzzzzz Please see at the end of the video i have shown
Sir,Thanks a lot for clear explanation one doubt I have as per explanation R-phase to E/F in forward case V reference you took opposite to Vr same way reverse explanation 180 opposite you took that is in phase with Vr up to that it was clear .
But in Y to E/F and B to E/F direction is mentioned in the drawing reverse but the fault is not in phase direction with corresponding phases so that as per my understanding it’s forward direction diagram if I wrong please explain sir.
yes your correct. i have made for forward only for Y and B .
For Earth fault always RCA should be in Negative. But you mentioned +40. What is the reason?
its depends on power in and out .
RCA = 40 degree. Why we not draw in anti clock wise direction As a reference of Vref
it will change region
Thanks sir
Welcome
Nice & clear explanation, however, I have doubts in the Io calculations as below:
when I1 = 2.8 L 0 degree
I2 = 1 L 240 degree
I3 = 1 L120 degree
Io should be = 0.60 L 0 degree
whereas you calculated 0.6 L180 degree
also there is difference when I calculate Io for faults on I2 and I3
Please explain your calculation?
Thanks
I WILL MAKE CLEAR VIDEO AGAIN
at 4:30s in your video, as previous calculation V0 is 60 degrees and I0 is 180 degrees for fault of L2-ground but your diagram is they are 60 degrees same? Can you explain for me, thanks.
Sir
please explain the relay neutral coil polarity change effect on the zone. Even phase coil polarity change effect details.
i will try to make
Io, Vo calculation for all cases, not getting correct
i will check
Can you make one video for cos theetta polarisation method
i will try thank you
Bro generator protection relay full testing video poduga
Will do soon bro
Sir, if RCA angle is -45 degree then MTA should be anticlock wise direction from Vref or same clockwise??
yes it should be in anticlock wise direction
@@baranitech
@SantoshKumar-nk5ve sir this angle (RCA) depends upon Network earthing like compensated, isolated & Solidly earthing. Here Isolated depends upon capacitance charging current when fault accrued (that is taken RCA - 90 deg lag). Compensated depends upon Capacitance & Inductance (that is RCA - 0 deg). Solidly earthing inbetween 0-90 deg). I hope this is correct & if wrong kindly clear me.
Case 2 calculation explain with calculator, and earth fault for rphase operating region is confusion
earth fault i will try to make one more video
Brother... RCA angle settings how to deside.. Wether its 45 60 40...dgree, its related with earthing system... Ungrounded grounded or resistance earthing how we choose exactly... Particular angle.. Kindly make clarify... Rest of this doubts... I got some idea's from... Above videos thanks
i don't know how to set RCA angle its design related. if i came to know i will share bro.
@@baranitech sure.. Thanks... Barani brother... Your doing such amazing work... I learnt lot of concept from you.. Thanks.
How did you get the RCA angle?
for calculation i have take random value
mta 40 or -40 ?
40
Bro directional earth fault tamil solluga bro
th-cam.com/video/P4pi64W6oAg/w-d-xo.html
@@baranitechநன்றி சகோ
During test the DEFLLPDEF 67n on the ABB REF615 relay, I make the same setting as u motioned on the video ,but it is not tripping in the operation region .I am confused ,can You show the full settings for the earth fault, thank you
Mentioned
i will make for ABB relay testing for directional earthfault
if you still need support for REF615 I am ready