Zig Zag transformer well explained. The lecture is very systemically presented. It is not only an exhibit of your ability in teaching a complicated subject, it is a good service to educate electrical engineers in simple and clear English with nicely drawn diagrams. You may use 1,2 and 0 notations instead of + - and o which conflict with sums of sequence quantities. VERY GOOD LECTURE INDEED AND MUCH APPRECIATED. CONGRATULATIONS.

Your explanation i very clear sir. It has removed all my doubts. I have been trying to understand the working principle of earthing transformer from other sources but it was not so explanatory. Thanks a lot sir. Deepak

Lucid but comprehensive. Bravo Sir

Hello sir, your video was very informative and knowledgeable, thank you for uploading such a valuable lecture on KZread for free.🙏

Thank you very much

Sir, first of all thank you very much for this useful video. For one of our customer we will install zig-zag grounding transformer. This system is 10.5kV and I am planing to limit grounding current with 1kA. At that point when I discuss with our transformer factor they need continuous amps and short time amps (short circuit amp), time and related bus voltage. 1-Rated Voltage is 10.5kv --> it is clear 2-Continuous amps --> As much as I have searched, 3 thing affect this value. First, unbalance condition amps. Second, magnetizing current for zig-zag transformer, Third one is capacitive current which is produce by cable. 3-Short time Current and Time --> Short circuit value, I have determine it 1kA 5second. In order to avoid over voltage, that is why I used 1kA. And I think 5 second is quite enough I will clear the earth fault less than 1 second. My questions are, Above information right or not ? Is there any missing part ? Should I also add, resistor to star point of zig-zag transformer ? After design team of transformer, finalize their work they will share ohm per/phase information with me. If these value is enough I think I do not have to insert grounding resistance also.. ? Best Regards,

@thinkseeeatthroughvickus4555

3 жыл бұрын

Gönenç Akçam 1) rated volt will be ur transformer rated volt. Normally transformer will be 11kv and during fault there is no load affected and hence slightly above rated system voltage of 11kv, that is something like 11.5kv 2) i am not sure which continuous rated current they asked. Its a confusion for me too to do sizing of earthing trafo calc. But if its ur system continuous current, u need to consider ur power trafo Full load Amp capacity 3) short time current value of 1kA looks very low, better check this valie with ur short circuit study

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

Thank you sir

good explanation. Liked

Thanks sir, how can we use zigzag transfermer like a auxiliary transformer

Good evening sir

Hello Dr Sahab can you please add me is there any group as I am analysing and studying different playlist so might assume you can reply to individual separately

Nicely explained.

@vikhyath7496

4 жыл бұрын

@@lecturesinelectricaleng Sir I have some technical doubt about PT with star connection.During the fault, can the fault current return to sourcethrough PT ground just like zig zag transformer??

How will it work in normal load condition? If there is a path to go to ground, won't current just take that path instead going to the real load?

Very gd lecture

How the fault current will flow from neutral when there is fault in b phase

At 18.19, a ground fault in the second phase, how current flows in a1,a2, b3 and b4 windings as both are at ground potential. Please explain.

@dr.tirupathirajukanumuri4451

4 жыл бұрын

Please refer 21.17. that current is due to third harmonics

As i have alot of Queries ,inadditon all in the comment ,we only see the Queries and no saw the reply from your side so all comments knowledge sharing is half duplex i would suggest if you please see the reply with comment than knowledge sharing thrrough queries get benefited for all users

why transformer neutral is grounded?

What is the use if fault current returns to source?how can the fault current be overcome?

@sowmya9042

3 жыл бұрын

@@lecturesinelectricaleng even after using the neutral grounding transformer,there is a still flow of fault current I(f) from B phase

Sir, please reply Qn) The most familiar application of ZIGZAG transformer is a) converting single-phase to two-phase b) As ground reference on an ungrounded system c) Reducing harmonics d) All of the above Which one is correct sir..??

@sajjansingh1632

2 жыл бұрын

@@lecturesinelectricaleng Thank you sir..

simply explained and informative. But how to decide size of transformer? can you please tell?

@thinkseeeatthroughvickus4555

3 жыл бұрын

but how can we do it? Can u plz tell method

@thinkseeeatthroughvickus4555

3 жыл бұрын

@@lecturesinelectricaleng i searched in Switchgear & Protection, power systems and in some other lectures, but couldnt find. Can you please provide its link?

@thinkseeeatthroughvickus4555

3 жыл бұрын

@@lecturesinelectricaleng PS 98 & 99 explains Sequence Networks. i couldn't find Earthing transformer sizing in those.

@thinkseeeatthroughvickus4555

3 жыл бұрын

@@lecturesinelectricaleng right sir. But i am looking a practical sizing calculation. in one of the project: 220/34.5star-delta Trafo, secondery was connected with an earthing transformer rated for 1000A, 10S with an NER of 1000A, 10Sec, 19.9 ohm. how this transformer is estimated as 1000A, 10sec?

@thinkseeeatthroughvickus4555

3 жыл бұрын

@@lecturesinelectricaleng but if you see above values, and 34.5kv/ Sq.root(3) = 19.9KV (phase voltage) and 19.9KV/19.9Ohm = 1000A. where 19.9 ohm is the selected value of resister, and 1000A is the current rating of both resister & earthing trafo. (since they are in series 1000A flows through both). So its totally confusing. And as per your lecture, If/3 will be neutral zero seq current right? So the fault current value obtaining in short circuit analysis /3 will be used for earthing trafo sizing. Am i correct?

Many Advertisement.

Very clumsy handwriting at least write clearly sir.. Mixing here and there

@ak-vx1wt

4 жыл бұрын

You are not a student of nursery so please try to understand