Sir, In a transformer differential relay, how can the same turns ratio current transformers (CTs) be used on both the primary and secondary sides, given that the transformer’s input and output voltages are different? According to the voltage ratio, the current increases or decreases. While it is acceptable for the CTs' outputs to be the same, how can the same turns ratio on the primary and secondary sides produce identical output currents? Please clarify this doubt.
Hello sir As you said for CT secondary the current flow is opposite to the CT primary current... please make any video what's the logic behind it or reply in text . Hoping you will respond
ek question ye h ki jb hmra transformer ka kaam hi yhi hai HT to LT convert yani jb volatge dono side alg alg hoti hai toh current b dono side alg alg hoga toh isme diffrence toh rhega hi fir dono side k bich diffrence toh rhega toh ye work kaise krega
Tq so much sir given good information. Sir I have doubt ht motor my differential relay lagate hy our us ke saat our ak relay bi lagaya jaata a donu my kya difference hy baatya na sir please.
In case of distribution transformer, current in the primary (high voltage) winding is always less than the current in the secondary winding. CT raio of primary & secondary winding always differ. In your explanation, you have shown same CT ratio for both windings. Besides, even in healthy condition also current in primary CT shall always be less than the current in secondary CT. Then the difference current will flow through the relay coil & shall trip the transformer. This is what I have predicted. Please throw more light on this matter to make me understand function of this relay correctly.
In conventional relay there is provision of matching CT in both side. And now a days in numerical relay no need of matching CT, there can be feed setting.
Hai sir I have a dought in restraining coil. When fault occurs, fault current surpasses through restraining coil as u said. Can I assume, restraining coil opposes sudden change in current for few sec then after it allows that current to flow in relay operating coil
sir Transfomer normal operation me bhi to primary and secondary me current different hota hi power constant rakhne ke lie.....tab operating coil me current kyu ni flow hota
sir normal transformer operation me bhi to primary and secondary me current different hota hi power ko constant rakhne ke lie.....tab differential relay ki operating coil me current kyu ni flow hota
u said restraining coil will stop inrash current or change in voltage/current due tap change ……..wont it stop the difference of current from CTs as well ? explain
Sir agar hamara connection Y-Y or ∆ - Y hoga to hamara operating & restarting coil hai usme koi change aayega kya ??? Or circuit diagram me koi change ho sakta hai kya ???
bro i have a dout transforer output means primary voltage is diffrent from secondary voltage but diffrential relay works on diffrence of magnitude so please explain if u know?
Sir Transformer ki primary aur Secondary me normal conditions me Voltage Different hone par Current bhi different hogi to operating Coil me Zero Current kaise flow hogi??
Thank you sir , i have a question to you . here you showing that delta side senodary point star connection and star side secondary point delta connection , why you use this system...? but our companies transformer are winding is majority percent transformer are HT side Delta and LT side Star connection . and we HT or LT bushing CT s both are secodary point connected always star. it fully different your drawing. and you showing HT n LT side CT ratio same is it possible...? plz plz plz plz sir explain me my question .
First consider full load current of HV winding of transformer. Keeping 20% as spare current value, next rounded off CT ratio to be selected. Say 80 ampere is current of transformer then select 100 ampere as primary current of the CT. Secondary CT current to be selected as per input current of the differential protection relay. Suppose relay input current as per manufacturer of the relay is 1 ampere, then CT ratio for HV Side CT would be 100 / 1. Now finalise LV side CT ratio as per corresponding current of HV and LV winding of the transformer. Suppose for example LV transformer current is 800 ampere, then select 1000 ampere as primary CT current of LV side. Now, we have to decide secondary current of this CT. First understand connections of HV & LV winding of the transformer. If both are either Star or Delta connected i.e. HV winding & LV winding both are Star connected (Star - Star) then 1000/1 ratio for LV winding is suitable. Considering connections of differential relay wires which are called pilot wires; during normal operation of the transformer from 0 load to full load, current shall be equal from both the CT's at any point of loading is the fundamental requirement. Moreover, in case of differential protection CT's, the class of CT's shall be class PS, where CT magnetising current saturation is studied and knee point voltage is taken into consideration. (If someone is using Microprocessor based differential protection relay, then class of CT requirement is derived from the relay input requirement as per catalogue of the relay. sathe1963@gmail.com Thanks!
Sir my question delta side star ct and star side delta ct connection kiya gya hai resion phase shifting and tap changing ke karan current flow hota usko avid karne ke liye Sir uske liye to resitring coil lga hai to usko avid kar sakta hai. Please reply
sir maine bola tha ki all type of relay ka video banao sir plz ... mujhe relay chapter par bohot problem hain... agar app mujhe all types off relay ka details video bana kar dogi to bohot help hoga sir ...plz i req to you sir 🙏🙏🙏🙏🙏🙏
switchgear wali playlist kab se search kar raha hu sir plz app help karo.. main ITI ELECTRICIAN PASSED hu.. govt exam ki taiari kar raha hu plz help karo sir🙏🙏🙏
Agar normal condition meh sirf ct se current flow hoga to kab transformer meh current jayega. Aur kiu normal meh primary and secondary meh cureent same ata hain? Voltage level to different ayega to fir cureent same kiu
fault current has very high magnitude , restraining coil may opppose , but its magnitude is very , some current pass to operating coil, and differential relay operate
Kya bolu ab. Tranformer hV aur LV side ka current thodi hi match hota he. Lv side me current high rhta he distribution tf me aur hv side me kam rahta he. Aur dono side same current rating ki CT kaise lg sakti he
aapka batane ka tarika bilkul hi lajwab hai,thank you very much
Superb video. And your knowledge is great. This video is best explanation in RUclips
Best video for understanding differential relay... thank you Abhishek ji
Sir aaap bahot achhe se explain krte ho ......
Thanks abhishek realy your r rock about relay knowledge
Ur style i like bcoz crystal clear idea given by u
Nice explanation
Amazing Experience watching your well described video
Very well explained, thank you so much dear friend 😊🙏🙏👌👌👌
Thanks sir for consideration of my request and well explained of transformer differential protection, Now I am waiting for transformer testing videos
+1
Most welcome Manohar...
Sir, please make video for Transformer Testing
Very informative video sir
Sir, In a transformer differential relay, how can the same turns ratio current transformers (CTs) be used on both the primary and secondary sides, given that the transformer’s input and output voltages are different? According to the voltage ratio, the current increases or decreases. While it is acceptable for the CTs' outputs to be the same, how can the same turns ratio on the primary and secondary sides produce identical output currents? Please clarify this doubt.
superb Yaar super se bhi upper very nice conclusion
Sir IR test in transform kese karte hai...it's value?
nice explanation of Diffrential protection of tramsformar
Thanks 🙏🙏🙏🙏👍👍👍👍 Hamara side me tap chang time same problem hua thaa.
Hello sir
As you said for CT secondary the current flow is opposite to the CT primary current... please make any video what's the logic behind it or reply in text .
Hoping you will respond
ek question ye h ki jb hmra transformer ka kaam hi yhi hai HT to LT convert yani jb volatge dono side alg alg hoti hai toh current b dono side alg alg hoga toh isme diffrence toh rhega hi fir dono side k bich diffrence toh rhega toh ye work kaise krega
Are Restraining coil & tripping coil inbuilt in advance numerical relay or relay itself manage all function? Kindly explain sir
Sir please make a video on different types of power grid connection
Tq so much sir given good information. Sir I have doubt ht motor my differential relay lagate hy our us ke saat our ak relay bi lagaya jaata a donu my kya difference hy baatya na sir please.
Sir apne video me kaha CT ratio same rakhna hai it means secondary same rahega par ye to jaruri nahi hai na ki primary wala v same rahe?
In case of distribution transformer, current in the primary (high voltage) winding is always less than the current in the secondary winding. CT raio of primary & secondary winding always differ. In your explanation, you have shown same CT ratio for both windings. Besides, even in healthy condition also current in primary CT shall always be less than the current in secondary CT. Then the difference current will flow through the relay coil & shall trip the transformer. This is what I have predicted. Please throw more light on this matter to make me understand function of this relay correctly.
..
Relay setting is always kept higher then the normal Spill Current which is due to Differnce in CT Ratios and Lead Leangths.
In conventional relay there is provision of matching CT in both side. And now a days in numerical relay no need of matching CT, there can be feed setting.
thanks
@Umakant yeh doubt mujhe bhi pareshan kar Rahi hai. Agar kuch clear ho to please reply
Sir plz make video on directional relay
Superb explanation sir
Where this restating coil installed. In transformer or in relay. Plz confirm.
Sir Please make vidios on transformer testing ,IR values
Sir plz make a video on phase shift ,phase angle ,phase squence and sooo on plz
Superb sir
Nicely explained sir, Thank You sir
Please clear
You use 100/1 CT
When 1000 amp flow then CT , Saturate , ct output only 1 amp
Agor delta delta and star star xmer ho toh CT ka kaya connection hoga???? Plz reply
Very good teaching aptitude sir thankyou
Sir. Do u have any video on Percent Differential Relay???
Hai sir I have a dought in restraining coil.
When fault occurs, fault current surpasses through restraining coil as u said.
Can I assume, restraining coil opposes sudden change in current for few sec then after it allows that current to flow in relay operating coil
Very good. Thanks 🙏🙏🙏🙏
Sir.
If there is short circuit in one feeder panel is there chances of getting trip of other panel in a company.
Very good explanation
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Pls. describe "Distance Protn.relay" & different b/w switched/Non switched distance relay.
Please explain why use opposite ct use
Plz. vector surge relay per video banaye..
I have made a video on this topic. Watch Playlist switchgear and protection.
@@electricalwithabhishekjoshi ok Abhishek ji
sir Transfomer normal operation me bhi to primary and secondary me current different hota hi power constant rakhne ke lie.....tab operating coil me current kyu ni flow hota
Doubt clear .thanks
Most welcome Shilwant...
Please make a video on 2 phase lighting transformers
sir,
Electrical saving per bhi video banvo
sir normal transformer operation me bhi to primary and secondary me current different hota hi power ko constant rakhne ke lie.....tab differential relay ki operating coil me current kyu ni flow hota
u said restraining coil will stop inrash current or change in voltage/current due tap change ……..wont it stop the difference of current from CTs as well ? explain
Fabulous and fantastic sir 🙏🙏
Sir agar hamara connection Y-Y or ∆ - Y hoga to hamara operating & restarting coil hai usme koi change aayega kya ???
Or circuit diagram me koi change ho sakta hai kya ???
bro i have a dout transforer output means primary voltage is diffrent from secondary voltage but diffrential relay works on diffrence of magnitude so please explain if u know?
Really very useful video.
according to the transformation ratio current will be different on of windings in power transformer ..how do you select CT for it?
Sir Transformer ki primary aur Secondary me normal conditions me Voltage Different hone par Current bhi different hogi to operating Coil me Zero Current kaise flow hogi??
Bcz CT connection also changed..
Aux ct lagate hai for balancing current.
Also you should know about spill currently
Hello Brother kindly use blank white paper and bold pen/ dark pen. Thankyou so much..
Okay 👍
Thank you sir , i have a question to you . here you showing that delta side senodary point star connection and star side secondary point delta connection , why you use this system...? but our companies transformer are winding is majority percent transformer are HT side Delta and LT side Star connection . and we HT or LT bushing CT s both are secodary point connected always star. it fully different your drawing. and you showing HT n LT side CT ratio same is it possible...? plz plz plz plz sir explain me my question .
Please explain about phase shift concept
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Sir,
My question is how to select CT ratio for primary and secondary side for differential relay..
Watch my video on how to select CT.
First consider full load current of HV winding of transformer. Keeping 20% as spare current value, next rounded off CT ratio to be selected. Say 80 ampere is current of transformer then select 100 ampere as primary current of the CT. Secondary CT current to be selected as per input current of the differential protection relay. Suppose relay input current as per manufacturer of the relay is 1 ampere, then CT ratio for HV Side CT would be 100 / 1. Now finalise LV side CT ratio as per corresponding current of HV and LV winding of the transformer. Suppose for example LV transformer current is 800 ampere, then select 1000 ampere as primary CT current of LV side. Now, we have to decide secondary current of this CT. First understand connections of HV & LV winding of the transformer. If both are either Star or Delta connected i.e. HV winding & LV winding both are Star connected (Star - Star) then 1000/1 ratio for LV winding is suitable. Considering connections of differential relay wires which are called pilot wires; during normal operation of the transformer from 0 load to full load, current shall be equal from both the CT's at any point of loading is the fundamental requirement. Moreover, in case of differential protection CT's, the class of CT's shall be class PS, where CT magnetising current saturation is studied and knee point voltage is taken into consideration. (If someone is using Microprocessor based differential protection relay, then class of CT requirement is derived from the relay input requirement as per catalogue of the relay. sathe1963@gmail.com Thanks!
sir, why smps posetive terminal is ground? (plese make a video).
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#anilautomationhindi
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Sir transformer ko hum static divice bolte hai to phir tap changer Kay hai ?
Please sir explained me.
Sir Transformer me normal condition me HV LV ka current equal hota to nahi hai.
To bhi relay kaise work karta hai....?
Well explained sir
Awesome 👍👍👍
Sir genrator differential protection me circulating current kya h
Well explained.
#anilautomationhindi
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Sir make a video on distance protection relay in our line protection.
#anilautomationhindi
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super explanation \....
Sir please aap , trip circuit supervision relay & restricted earth fault relay per video bnaye.
Arpit, restricted earth fault relay pe video banaya hai. Drawing ke sath explain kiya hai
Best ever explained
Sir kya ye connection sabi relay par ho sakte h
Very good explanation, thank you.
In normal scenarios also current flows from both CTs. Why then differential relays don't act? Pls answer the query.
it cancel out each other
Sir transformer me incoming current and outgoing current same kaise ho Sakta hai ..
Sir,
Please Make video on 2 nd ,3rd ,4th harmonic filter bank in SVC.
Good Explanation
Sir please explain transformer stability test..
33kv manual trip ckt what is the uv blocking.....? Please give me replay
Sir my question delta side star ct and star side delta ct connection kiya gya hai resion phase shifting and tap changing ke karan current flow hota usko avid karne ke liye
Sir uske liye to resitring coil lga hai to usko avid kar sakta hai.
Please reply
Sir please make a vedio how to measured transformer winding temperature
Please make video of oltc control diagram
No word sir 🙏🙏🙏
Thank you Sangeet...
sir maine bola tha ki all type of relay ka video banao sir plz ... mujhe relay chapter par bohot problem hain... agar app mujhe all types off relay ka details video bana kar dogi to bohot help hoga sir ...plz i req to you sir 🙏🙏🙏🙏🙏🙏
Jeet, switchgear wali Playlist dekho.. waha sab mil jaega...
switchgear wali playlist kab se search kar raha hu sir plz app help karo.. main ITI ELECTRICIAN PASSED hu.. govt exam ki taiari kar raha hu plz help karo sir🙏🙏🙏
Agar normal condition meh sirf ct se current flow hoga to kab transformer meh current jayega. Aur kiu normal meh primary and secondary meh cureent same ata hain? Voltage level to different ayega to fir cureent same kiu
Same question here
Please sir ONE VIDEO
Difference between REF AND DIFFERCIAL PROTECTION
What happens when i use 300/1 CT in primary side and 800/5 CT in secondary side in 15 MVA X'MER then how diffrntial protection works. Pls. ans
Very nicely explained
Super sir
Sir restraining coil deffrencial rely ke andar hota hai plase bataey
How the restraining coil differentiate between high inrush current and fault current.
fault current has very high magnitude , restraining coil may opppose , but its magnitude is very , some current pass to operating coil, and differential relay operate
Dear sir
If fault is happen outside the transformer I.e CT than what happen ....
Due to CT saturate relay is operated or Not?
Now CT star mea hoti han or compensation relay apne software mea karti ha
what is the ratings of transformer in your example
Ir, Isc, Im, means kya hai jo realy timer and contactor leka hota hai
In normal condition both side of transformer same magnitude of current is not flowing because HT side and LT side current are not same in transformer.
Sir jb dono side star configuration ho to ct ko kaise connect kre
Distance protection relay fault ka distance ko kasea sense krti h
Well explained
Kya bolu ab. Tranformer hV aur LV side ka current thodi hi match hota he. Lv side me current high rhta he distribution tf me aur hv side me kam rahta he. Aur dono side same current rating ki CT kaise lg sakti he
Thank you sir
Up to how much KVA differential relay used in transformer
From 5MVA to upside...
Settings kaise krte hai differential relay ki
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