Answer / ankush miglani 09718151073

see i will give u the exact answer
in actual wat happn when u apply dc at the primary flux
will be produduced in the core bt it is not alternating in
nature hence no flux is cut by the secondary winding so no
current is there in secondry side
and due to static flux the leakage current produced in the
primary side is high wich starts heating the pr wdg and
finally it burns the pr wdg and t/f is damaged.

so pls never ever try to give dc to a t/f
haan pactically dekhne ke liye try kr b sakte ho bt baad me
mt bolna ki inform ni kiya tha

Answer / saju

Transformer is an inductive coil.Emf induced in the primary
side of transformer is due to self induction
and in the secondary due to mutual induction.

In dc their is no induction because absence of frequncy. So
transformer is not working in dc.Unless dc supply is
pulsating or switching

Answer / vikas singh

Trnasformer winding is induction in nature. Inductive
reactance XL = 2*pi*f*L. Since for DC f=0, so XL=0 then a
high current will flow since the reactance is 0 which will
dmage the winding.

Answer / anand

actually when we provide the ac supply to the primary
winding then aflux gets induced in the core,this flux
complets the path through the core because ac current is
varying type so the flux induced will also be of varying
type ,so this induced flux causes a current induced in the
secondary winding.and this case is not with dc current.So
only ac current is used in the transformer.

Answer / nag

transformer is inductive circuit because it opposes the dc
supply

Answer / ramesh

My suggestion, transformer was 3Ph supply & frequency
magnetic flux produced in the primary side winding & DC
supply only 1ph supply no magnetic flux in the winding. All
motor supply is required 3ph supply, but DC not available
3ph supply. DC current is more than AC current.

Answer / saravanan

primary side is low risistance dc current is flow burnout
the sisistance so not induced emf dc side is not frequence
applide

Answer / gayathri

Transformer is static device.the transformer is mainly operated in Ac supply. because the AC voltage, AC current flow through the primary winding,

Answer / vijay

if use dc then primary winding damages bcz of high current
at primary side dc produses steady flux

Answer / hemantpandey

because transformer is a static device it can only conver the elctrical energy from one form to another and not perform

please tell me formula of 3 phase induction motor under condition{1]when we 3 phase motor starts without load in star or delta connection?thanks

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TRAFO 1. WHY BREATHER IS USED. 2. WHY OIL GOES DOWN IN CONSERVATOR TANK. 3. WHY WE ARE TAKING OIL SAMPLE TAKING FROM BOTTOM OF TRANSFORMER. 4. HOW TO CHECK IR VALUE OF TRANSFORMER. 5. WHY OLTC HAVING BUCHHOLZ TRIP ONLY; WHY NO ALARM. 6. OFF LOAD TAP CHANGER OPERATION PROCEDURE. 7. TR. SHUTDOWN / ISOLATION PROCEDURE. 8. WHEN THREE TRS. IN PARALLEL, ONE TR. IS NOT SHARING THE LOAD – WHAT IS REASON AND WHAT YOU WILL DO. 9. WHY TR. HAS OLTC IN HV SIDE. 10. WHAT IS % IMPEDANCE. 11. WHY TR. RATING IN MVA. 12. WHAT IS VECTOR GROUP IN TR. 13. CONDITION FOR PARALLEL OPERATION OF TRS. 14. WHAT IS TERTIARY WINDING. WHERE IT WILL BE. 15. IF TR. TRIP ON BUCHHOLZ OR TAP CHANGER RELAY, WHAT YOU WILL DO. 16. DIFFERENCE BETWEEN OIL TEMP. AND WINDING TEMP. PROTECTION 17. HOW WINDING TEMP. IS MEASURED IN CAST RESIN TR. 18. DIFFERENT TYPES OF FAULTS IN TR. Trafo - Page-1 of 2 19. WHAT HAPPENS WHEN TR. CHARGED FROM LV. 20. WHAT WILL YOU DO IF MEGGER READING SHOWS ZERO BETWEEN LV WINDING AND EARTH. 21. CAN WE INTERCHANGE BUCHHOLZ RELAY OF MAIN TANK AND OLTC TANK. 22. IF THE LINE BETWEEN BREATHER AND CONSERVATOR TANK 23. LOCKED, WHAT WILL HAPPEN DURING LOAD CYCLE. 24. WHAT IS THE FUNCTION OF OIL SEAL IN BREATHER. 25. WHAT ARE LOCATIONS FOR BUCHHOLZ RELAY FIXED IN POWER TR. 26. WHAT ARE CHECKS IN POWER TR. DURING MAINTENANCE. 27. WHAT IS IMPORTANT WHEN WE CHECK OLTC OPERATION DURING MAINTENANCE. Trafo - Page 2 of 2

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