Sir i am working in 33/11 kv station....where 5 mva transformer is feeding power through 11 kv feeder..... kindly help me setting to set relays for feeder and bank and transformer breaker...
Hi great video. I have some confusion regarding these tripping curves. We know that to determine tripping time, you either use the curve or calculate the time using formula (of that specific curve). For e.g. we have a relay which is standard (normal) inverse or SI, like the GEC CDG31. It has also has a scale/chart given in its nameplate provided by the manufacturer to determine tripping time. But, when i use the formulae [ t=TMS * (0.140/(Ir^0.02)-1)] to determine time, using same current multiplier settings and time multiplier settings, and using same SI standard curve constants (k=0.140 & alpha=0.02), the calculated value does not matches the scale. Why is this? Am i missing something here? Need your help.
Dear the three curver mentioned has only difference of slope & firmula...it depends u want fast instant tripping or u want to wait for some time then trip....accordingly u have to calculate.
Dear... There is no thumb rule to select curve, you have to put value & get the tripping time & co relate with your higher side relay... It should be in sync.
Your way of explanation very good please make serious about etap or power systems software in Hindi tutorial
Very nicely said...
Sir i am working in 33/11 kv station....where 5 mva transformer is feeding power through 11 kv feeder..... kindly help me setting to set relays for feeder and bank and transformer breaker...
Hi great video. I have some confusion regarding these tripping curves.
We know that to determine tripping time, you either use the curve or calculate the time using formula (of that specific curve). For e.g. we have a relay which is standard (normal) inverse or SI, like the GEC CDG31. It has also has a scale/chart given in its nameplate provided by the manufacturer to determine tripping time. But, when i use the formulae [ t=TMS * (0.140/(Ir^0.02)-1)] to determine time, using same current multiplier settings and time multiplier settings, and using same SI standard curve constants (k=0.140 & alpha=0.02), the calculated value does not matches the scale. Why is this? Am i missing something here? Need your help.
Sir I want help relay co ordination
Diffrence in NI,VI,EI in which relay only 3 curve available
Please help
Dear the three curver mentioned has only difference of slope & firmula...it depends u want fast instant tripping or u want to wait for some time then trip....accordingly u have to calculate.
How can we plot the relay coordination curve.( can you please share the spreadsheet for calculation?)
Sir very inverse curve kab select kare??
Dear... There is no thumb rule to select curve, you have to put value & get the tripping time & co relate with your higher side relay... It should be in sync.
Thank you so much
You're most welcome
Send excel sheet of calculation
Sir any contact no or whatsup no for doubt cleaning
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