Saturday, 24 February 2018

Do You Know How Manny Types Of Transformer???

Basic Theory On Electrical Transformer And All Types Of Electrical Transformers!! 



Different Types Of Transformers And Detail Of The Electrical Transformer 






According To Construction, there are two main types of transformers namely

  1. (i) Core type and 
  2. (ii) Shell type




 Core type transformers


  • In this Type of Transformer, the windings surround the iron core. 
  • Both windings are divided and half of each winding is placed on each as shown in figer so that the two windings can be closely coupled together to keep the leakage flux and hence leakage reactance low.


The Low Voltage (l.v.) winding is wound on the inside nearer to the core while the high voltage (h.v.) winding is wound over the l.v. winding away from the core in order to reduce the amount of Insulating Materials required and also the insulation of low voltage winding is easy.


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With this Arrangement Of Windings, only one layer of high voltage insulation is required and removal or repair of the high voltage winding, which is more liable to faults than the low Voltage Winding, is easy and convenient.


Small transformers have core of square or Rectangular Cross-Section but for large size transformers stepped or cruciform core is used as shown in figer. The core section for core type of transformers may be square, rectangular or stepped. Shall Type Transformers use cores with rectangular cross-section.


As the space utilization is better with stepped cores, the length of mean turn of copper is reduced and therefore Copper Losses and cost of copper also reduced.

Shell type transformers 

In Shell Type Transformers, the windings are put around the central limb and the flux path is completed through two side limbs as shown in figer .


The Central Limb Carries total mutual flux while the side limbs forming a part of a parallel magnetic circuit carry half the total flux.

Consequently, the cross-sectional area and hence width of the central limb is twice that of each of the side limbs. The sandwich type of winding is used in which the sections of the primary winding are sand wiched in between the sections of the secondary winding as shown in figer .

therefore the Leakage Flux is reduced and hence leakage reactance will be low. To minimize the amount of high voltage insulation, low voltage coils are placed adjacent to the Iron Core.


 In this Type Of Transformer, the coils are better braced mechanically that they are less easily displaced by the high electro-mechanical forces that frequently develop during short circuits

Question part about the types of transformers :

1)give a type of transformer according to construction?????
Ans: (i) Core type and (ii) Shell type

2)in core type transformer winding on ____??
Ans:the windings surround the iron core.

3) give one advantage of core type transformer??? 
Ans:As the space utilization is better with stepped cores, the length of mean turn of copper is reduced and therefore copper losses and cost of copper also reduced.

4)how arrange shell type transformer winding????? 
Ans:In shell type transformers, the windings are put around the central limb and the flux path is completed through two side limbs.

5)give one advantage of shell type transformer???
Ans: In this type of transformer, the coils are better braced mechanically that they are less easily displaced by the high electro-mechanical forces that frequently develop during short circuits




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