Saturday, 24 March 2018

You Know When We Can Do The Parallel Operation Of Transformer!??

You Know When We Can Do The Parallel Operation Of Transformer!?? 



What is The Requirements For Operation Of Parallel Operations Of Transformers!!  And What is Use Of Parallel Transformers!! 





The Transformers are said to be connected in parallel when the primaries of two or more transformers are connected to a common source or supply and the secondaries are connected to supply a Common Load.




All the transformers to be connected in parallel should be of the same construction either core type or shell.


Necessity of Parallel Operation of transformers

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The Parallel Operation Of Transformers is necessary due to the following



(i) to supply the load in excess of the rating of an e Existing Transformer, an additional transformer can be connected in parallel


(ii) when one transformer in taken out of service for maintenance or repair, The Other Transformer maintains the continuity of supply to the consumers


(iii) if any one transformer fails to operate, there is no Interruption of The Power Supply


(iv) to increase the relinbility of The Power System

Parallel Operation Of Three Phase Transformers


The Conditions for proper and satisfactory parallel operation of two or more 3-phase transformers are as follow:

Essential conditions:




  1. (i) Same polarity
  2.  (ii) same voltage ratio
  3. (iii) same phase sequence
  4. (iv) Zero relative phase displacement


In addition to the above Essential Conditions, the desirable conditions to be satisfied for better load sharing and operating power factor are

(i) Equal per unit impedances and
(ii) Equal ratios of resistance to reactance(R/X)


Question part to Related This Article  :


(1)when The transformers are said to be connected in parallel????
Ans: when the primaries of two or more trannformers are connected to a common source or supply and the secondaries are connected to supply a common load.


(2)Necessity of parallel operation of transformers???
Ans:(i) to supply the load in excess of the rating of an e existing transformer, an additional transformer can be connected in parallel

(ii) when one transformer in taken out of service for maintenance or repair, the other transformer maintains the continuity of supply to the consumers

(iii) if any one transformer fails to operate, there is no interruption of the power supply

(iv) to increase the relinbility of the power syetem


(3)give essential condition of connection of transformer in parallel??? 
Ans:(i) Same polarity
 (ii) same voltage ratio
(iii) same phase sequence
(iv) Zero relative phase displacement


(4), give the desirabal conditions to be satisfied for better load sharing and operating power factor in parallel connection of transformer????
Ans:
(i) Equal per unit impedances and

(ii) Equal ratios of resistance to reactance(R/X)



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