PE47 Protection of SCR, Snubber Circuit

Lectures on Power Electronics By Dr. Tirupathiraju Kanumuri
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#ProtectionofSCR
#Snubber

[@mohammadsalim5619]

Sir, in buck boost converter if the duty cycle is less than 30% then is it act like a buck converter?

[@souravroy1128]

Sir please provide a book expect AK Sahani...I really afraid that book 😅

[@surendrakverma555]

Very good lecture Sir. Thanks 🙏🙏🙏🙏🙏🙏🙏🙏🙏

[@NuraySaglamBedir]

at 14:21 you mentioned that R=Rs+RL. So doesn't it need to be like R=Rs+RL= 2*delta* sqr(L/C)? Also, you mentioned the initial condition just for the capacitor what about the inductor's initial condition? Shouldn't the Inductor also act as an open circuit for the initial condition?

[@NuraySaglamBedir]

@@lecturesinelectricaleng What about this question sir "at 14:21 you mentioned that R=Rs+RL. So doesn't it need to be like R=Rs+RL= 2*delta* sqr(L/C)?"

[@akhilt9870]

@@NuraySaglamBedirmy doubt is exactly same...

[@akhilt9870]

@@lecturesinelectricaleng please reply to the comment sir

[@akhilt9870]

Sir in damping ratio formula r=(Rl+Rs) right?... Then why do you take it only as Rs

[@akhilt9870]

Sir even though capacitor intial voltage is assumed to be zero but we can't neglect the capacitor kada sir.

[@kumarg7365]

sir i have doubt ,at 10.32 design of snubber intial current through capacitor is zero you have not taken capacitor but why considering inductor its intial current also zero

[@lucasianii8178]

Professor.

[@vishalgautam1076]

Good explanation

[@deepalps]

Sir, I am using a 3 phase contactor to switch a 25kvar capacitor at 440V(33A at 440V), can u suggest the right values of capacitor and resistance that can be used as a snubber to supress arc and protect the contacts of the contactor.

[@yogendrapal3633]

Gajab sir ji

[@souravee1428]

Sir can you please share which screen recording & video editing software is best to use?

[@souravee1428]

Sir thank you very much.... You are so kind to answer queries both technical & non-technical as well.... India needs more teachers like you who is so much passionate for teaching & helpful for the students.

[@BrijeshKumar_electrical]

nice sir

[@freshersofbose456]

Sir please correct the circuit diagram. Bcz a thyristor's anod and cathode pin should not be connecte directly without load with the supply voltage. because it's make short circuit. So please sir kindly correct the circuit diagram.😊

[@parthdixit4159]

Varistor is there so no need of load.

[@freshersofbose456]

@@parthdixit4159 what is the function of varistor?

[@parthdixit4159]

@@freshersofbose456 varistor is generally maintaining the anode cathode voltage of scr which is set to a fixed value. If the voltage is very high which might damage the scr then varistor will bypass the extra current and if the voltage value is small then varistor will be open circuited so the proper anode current can be maintained safely. Conclusion: varistor maintaining safer anode cathod voltage across scr due to which anode current can not exceed SCRs max rated current value.

[@freshersofbose456]

Thik hai ye to theory hai .plz aap ek baar practical karke dekh lo kya hota hai . Ckt run kartaa hai yaa nehi😊

[@manishsukriya03]

Great sir .and thank you sir for valuable lecture videos