Relay setting calculation|Restricted Earth Fault Protection relay Setting Part-2|KNEE POINT VOLTAGE

[@kulkarnir93]

Sir, Thanks for giving such good knowledge about REF protection. How RCT of 4 nos CTs i.e. 3 phase CTs & 1 neutral CT. Also explain the exact method of calculating wire connected with the 4 CTs.

[@rameshtripathy5978]

It is very much useful for the commissioning engineers !

[@priyal5354]

Vs =60V will appear across secondary terminals of CT, right? How to choose Is?

[@wongsabarchannel1335]

Do you have Low Impedance REF Calculation Video?

[@thetruelegend2502]

Thanks sir, Crystal clear to understand

[@musicvideo1566]

very good

[@patelsiddharth7698]

Sir can we use REF protection for 1MVA transformer?

[@sridhar3377]

Is there any video of this calculation also done for the condition of NCT with resistively grounded??

[@shantanumajhi5408]

Very Useful

[@elavarashanrajesh6560]

Very usefull sir thank u very much ❤❤❤❤❤

[@bristykhatun2404]

thinks sir vary good job

[@jppatnaik2240]

For Each CT whether we consider of One CT (or) all 3 CT ? ( RCT )

[@surendrakverma555]

Very good. Thanks 🙏🙏🙏🙏

[@hosseinshabaniroshan8174]

Hi.I want to know exactly how to draw the characteristics of this relay...? Do the differential current and bias current ,which are the necessary characteristics for this relay , come from the normal state of the relay or from fault condition?

[@hzbajlanihzbajlani6699]

We have a factory that requires 6 MVA electric power , Can we use one large transformer and limit the fault current with NGR? our transformer is 11/0.4 KV

[@jitendradubey3682]

Thanks sir.... Very informative 😊😊😊🙏🙏🙏

[@balakabimuki2023]

Hello sir, After calculated VS , why should we use the formula of CT Vnee>2Vs?? and here this video you increased the voltage from 120 to 400?????and you told that we can use 650V also..how to choose the maximum voltage ???

[@yokeleetan8525]

It seems from your calculation Vs is the voltage across the relay and stabilising resistor.

[@jyothiyecherla7964]

Here RCT Value means combination of 4 cts or one ct?

[@zahidulislam2458]

Nice

[@hplar2972]

Hi,just want to ask you is it earth that was intalled at MSB also the same funtioning?

[@hplar2972]

I mean earth fault relay

[@ranjan1436]

pls make a video on knee point voltage. so far it is fantastic.

[@electricaltechnologyandind5335]

There is already a voltage on knee point voltage selection. Check the restricted Earth fault protection series

[@learnbyshiva725]

Thanks sir very good job

[@thinkseeeatthroughvickus4555]

Please make a video on - what all relays can be connected from same CT, and where CTs to be installed in case of transformer protection, bus bar protection, so that it wii give an idea how many CTs required

[@ManojkumarSahoo_electrical]

Sir, How to calculate the power rating (Wattage) of stabilizing Resistor for REF relay.

[@neerajpiplani185]

Wonderful explanation. Could you please explain why knee votage should be atleast twice Vs

[@CartoonwonderlandEdu]

Love u yar ur vedios are so good to understand

[@wary8113]

WHICH CT RESISTANCE TO BE TAKEN IN CALCULATION? 3 CT OF LINE & 1nct is in parallel?

[@shankhachongder6065]

Thank you for the video sir

[@jamesowusu-ansah595]

Sir please, by safely choosing the the knee point of the CT to be twice Vs...Then it's safe to say the LCT's won't get saturated for high value external faults right?

[@electricaltechnologyandind5335]

Yes. That is one of the check point of REF setting

[@jamesowusu-ansah595]

@@electricaltechnologyandind5335 So if it's unlikely to enter saturation by safely selecting your CT knee point, then i really don't see the need of a stabilising resistor Also, won't the stabilising resistor reduce the current in the event of a ground fault within the protected zone, hence, the relay might not operate?

[@electricaltechnologyandind5335]

When vs has occurred that will drive current through relay. For that stabilizing resistance is given. Please watch the video again

[@jamesowusu-ansah595]

@@electricaltechnologyandind5335 But Vs only occurs when the CT'S get saturated right?

[@electricaltechnologyandind5335]

No. When current flows.

[@ajithomas8342]

🎉

[@pceprojectspvt.ltd.6183]

In case the earth fault is inside the zone , how to ensure that insertion of stabilising resistor will not lower the fault current below the pick-up setting of the relay

[@yctsang6561]

I have the same doubt

[@sujonshahofficial2572]

Wow

[@shashah769]

😍😊

[@rakeshnanda9506]

Nyc explanation sir

[@thinkseeeatthroughvickus4555]

Can you do a video on PS or PX class CT sizing?

[@nageshpawar2455]

THANK U VERY MUCH SIR....

[@ashutoshpokhriyal1020]

Sir please share distance protection setting calculations

[@shujaatkhan6637]

Dear Sir, Can you please make a video on Knee point voltage

[@ABHAYSINGH-um3wc]

excellent but please make the more easy those concepts

[@ashiqurrhman292]

Nc

[@kameshwarmehta5507]

Fault current calculation how.....

[@mdronvai4405]

❤️🥰😏

[@naimulislam41]

nc

[@akhilsm6840]

Why the CT saturated even though the CT knee point voltage is very high

[@electricaltechnologyandind5335]

Normal protection relay doesn't have high knee point voltage

[@dilipsahusahu680]

Please please please Hindi sir

[@mdborhan2690]

very nice

[@mdborhun15]

Wow