SGP401 Types of Faults in Transformers

Lectures on Switchgear & Protection By Dr. Tirupathiraju Kanumuri, Assistant Professor, NIT Delhi
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Lectures on Power Systems: • POWER SYSTEM
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Lectures on Synchronous Machines:
• Synchronous Machines
Lectures on Special Electrical Machines: • Special Electrical Mac...
Lectures on Transformers: • Transformers
Lectures on DC Machines: • DC Machines
Lectures on Induction Motors:
• Induction Motors
Lectures on Basic Electrical engineering:
• Basic Electrical Engin...

[@dreamsunlimited4141]

Why do Earth faults occur in a transformer? When the transformer neutral is grounded, this fault trips the HT breaker. And if we isolate neutral there is no tripping occur, is there any solution to get rid of this?

[@brahmaiahk3140]

Thanks for helping all btech students for this time really helpful a lot sir ..thanku,👃👃

[@surekhagaikwad5195]

Hello Sir..thanks for this lecture. Sir I want to know why gnd faults in star side are not reflected on the delta side. This concept not clear to me. We say zero seq current fkows within d closed delta and then wat abt star wdg. Also at this point I am confused abt faults getting transferred frm one side to d other. Sir pls ckear all these doubts. Thank you so much in advance.
Sir I wud like some topics like:
1. Area classification (hazardous area)
2. Selection criteria for motor sel for haz area.
3. Cathodic prt
4. Cable trench seq of cables clearances etc.
5. Substation requirements door opening..panel clearances..no of entry exit door ht trafo fence or wall ht etc.
6. Arrangement of cables on cable tray.

[@surekhagaikwad5195]

Hello Sir, could you please tell me why there is no ñeutral for HT. Where does unbalance current flow in HT.

[@tejindersingh5077]

Very nice sir,
I have a fault seen that when I close the 1 Mva transfo on 11kv the transfo trip on earthover current,
Tripping values are like
I1 1.30 amp
I2 1.35 amp
I3 1.32 amp
I0 3.93 amps
These values are secondary of ct.
Please help what can I do?

[@kiranrahane5728]

Sir,Our 33/3.3KV 2MVA transformer has the same issue, if you got any solution,plz let us know

[@deeneswaranm7640]

sir,one doubt.sometimes i saw a red heated like on the connection terminals of transformer,how it happen???

[@abhishekreddy5866]

Sir what are text books you referred for transformer protection ?

[@amajuify]

Hello Sir, I have a question. After carrying out a DGA analysis on a transformer, the fault detected was a low thermal fault (t < 300 degrees celsius). I just want to know what is the impact of a low thermal fault? should the transformer still be in service? and what are the possible consequences? Thank you.

[@cesurc7977]

Hi, no problem, you can continue to work it. thats why is the impact of low thermal fault. transformer can be in service but it should be strictly followed by DGA analysis (one DGA analysis per 3 months). after these intervals, if it is still rising, follow IEEE C57.104 and decide to repair it.

[@surekhagaikwad5195]

Hello Sir..please cud you make video on DG sizing.and imp parameters or considerations.

[@mostafaelsayed5333]

Thank u sir .. is there electrostatic shield between LV & HV side to reduce electric field stresses on low voltage winding insulation?

[@bashap.h2191]

sir ,
Please upload regarding only over current protection briefly but your previous video regarding over current but very basic information available , I hope that ur upload briefly videos very shortly

[@surendrakverma555]

Very good lecture Sir. Thanks 🙏🙏🙏🙏🙏🙏🙏

[@johnsonpuli6027]

Nice explanation sir

[@Mriduljatin999]

very nice lectures.god bless you.

[@anilkumargouda999]

Very good explanation.

[@NokulungaMacu-uq8qu]

Thank you so much sir

[@IBTechnicalClasses]

super sir

[@mehadyhasan9245]

Thanks

[@jyothishkv]

Thank you sir