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Transformer – Cover Full Chapter

TRANSFORMER ONLINE TEST

Transformer – Short Theory | Cover Full Chapter

Definition : A transformer is a static device used for transforming power from one circuit to another, through electromagnetic induction, without changing frequency.

TRANSFORMER FULL

Parts of a Transformer :

  • Core : – Use to magnetically connect both windings. Made of silicon steel, it is laminated to reduce eddy current loss. 3% – 5% silicon mix with steel to reduce hysteresis loss.
  • Primary Winding :– Connect with electrical power source (AC) to produce magnetic flux. Made of Copper.
  • Secondary Winding :– Connected to load , used to induce EMF. Made of copper.
  • Tank :– It keep save the core, windings and transformer oil.
  • Transformer oil :– Use as coolant, insulator and prevent oxidation. Paraffin type oil is generally use due to easy available.
  • Conservator :– Provide space for expansion of transformer oil due to temperature rise.
  • Buchholz Relay :- It is a safety device, use to indicate internal faults.Located between Tank and Conservator.
  • Breather (with Silica Gel) :– Use to absorb the moisture. When it absorb moisture the colour of silica gel become dark-blue to pink.
  • Radiator :– Use to cool the transformer oil.
  • Drain Valve :– Use to collect damaged oil.
  • Tap Changer :– Only provide for Auto-Transformer to control the secondary power, through changing tap-position.

Test of Transformer :-

  • Open Circuit Test / OC Test :- Conducted to find core loss. Low voltage side will connect for testing and high voltage side left open.
  • Short Circuit Test / SC Test :– Conducted to find copper loss. High voltage side will connect for testing and low voltage side short-circuited.
  • Sumpner Test :– Conducted to determine temperature.

Voltage Regulation : If voltage regulation is minimum, then good. As example – two transformer having regulation 2% and 5% respectively, then the 2% regulation transformer is more efficient than 5%.


Transformer Noise :– Transformer noise is called “Hum” or “Humming Noise”. Humming noise induced due to vibration of laminated sheet by magnetic force.

  • Minimum noise – at full load.
  • Maximum noise – at no load.

Auto Transformer :- It has a single winding on iron core and a part of winding is common to both primary and secondary.

  • Advantages :-
    • Saving of copper
    • Higher efficiency
    • Better voltage regulation
    • Smaller size

Ideal Transformer :-

  • No winding resistance
  • No leakage flux
  • No iron loss

Losses of Transformer :-

  • Core loss/Iron loss = Eddy current loss + Hysteresis loss
  • Copper loss = Resistance of the winding

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Transformer – Cover Full Chapter | EndlessEducation
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Transformer – Cover Full Chapter | EndlessEducation
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A transformer is a static device used for transforming power from one circuit to another, through electromagnetic induction, without changing frequency.
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EndlessEducation
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Kanchan Chatterjee

Web designer & a professional blogger from India. The founder & CEO of EndlessEducation Blog.

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