Answer / sandeep

Transformer must not be connected to a DC Source because if
the primary winding is connected to DC Supply mains, the
flux produced will not vary but remain constant in magnitude
and therefore no EMF will be induced in secondary winding
except at the moment of switching ON. Also there will be NO
Back EMF induced in the primary winding. Therefore a heavy
current will be drawn from the supply which may result in
the burning of the winding.

In Transformer, If primary winding is connected to a source
of alternating voltage, an alternating flux is set up in the
laminated core and links with the secondary winding of the
transformer in which it produces mutually induced e.m.f
according to the principle Faraday's Laws of
Electromagnetic Induction.

Answer / reji

the above ans is correct. moreover, the DC resistance of T is much less compared to its reactance. ie, impedance is huge . thus when T is connected to DC, a very high current will flow and the winding will certainly burn.

Answer / aravind s

transformer works with mutual induction principle mutual induction must want change of flux or change of conductor.and transformer have non movable parts so we use principle of change of using frequency.

and also transformer works in DC (when it is pulsetting DC)

If we have to feed a housing complex having load 8MVA, than what would be the better option, either we first step down 33kv supply into 11kv & than 430v or we proposed no of 33/.44 kv transformer, also which option is economical?

0 Answers   Kirloskar,

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It is advisable 2 use auto-transformer if transformation ratio is-a)110KV/11KV,b)230kv/110kv,c)110kv/66kv,d) 400kv/230kv

2 Answers  

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hi friends if you have any 400KV Substation Erection and installations Drgs please send to me.My email id:kandi.suresh441@gmail.com

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how encoder works?

1 Answers   ITC Infotech,

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What is the safety protection? Name the protections of Transformer?

1 Answers   HSL,

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I know current,volt,powerfactor of an electrical line. In this line how I will calculate Active power and Reactive power

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What is use of reactor..how it is help ful in electrical system .....brief explain

1 Answers  

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what is the prinsiple of dc motor and construction and working ,application of dc motor.

0 Answers  

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for testing busbar (33kv) hi-pot .whether we can apply DC r not.and what is the test volt for that .explain

4 Answers   WGPSN,

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what is called star connection and delta connection also purpose of this connections?

3 Answers   Siemens,

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3.The slip of an IM UNDER FL condition is about.....

1 Answers   SSC,

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How to calculate cable size for a particular load? i have 12 MW,11KV Motor 3 Phase, what should be cablesize? What are the points to remember for cable sizing calculations?

2 Answers  

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