Thursday, 15 March 2018

What Is The Application Of Potential Transformers ???

What Is The Application Of Potential Transformers ???




How We Can Use The Potential Transformer To Find The Value Of The Voltages!!? 



Potential Transformers are used for the uannformation of voltage from higher values to a lower values that are suitable for Measurement And Protection.




Potential Transformers are used for measurement and protection. The VA rating of PT is very small compared with Power Transformers.



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  1. The Secondary Voltage rating of PT is usually 110 V.
  2. Potential Transformers consist of two separate windings on a magnetic core. One winding consist of few turns of thick wire and is called the Secondary Winding
  3. The other winding consists of a relatively large number of turns of thin wire and is called Primary Winding.



Figer shows the Connection Diagram for a potential transformer .


The voltage to be measured in applied to the primary winding of PT and the secondary is connected to the meter .


The primary of PT is connected directly to Power Circuit between phase and ground and the Secondary Terminals are connected to the meter or relay.

Ratings of PTs



  • (i)  Rated secondary voltage : 110V or 220V
  • (ii) Rated output 10, 25, 50, 100, 200 and 500VA

For Lower Voltages up to 3.3kv dry type PTs are used and for high voltages oil immersed PTs are used.





Question part about Potential Transformer :

(1) what is Potential transformer?????
Ans: potential transformer  are used for the uannformation of voltage from higher values to a lower values.


(2)Potential transformers are used for ?????
Ans:meaaurement and protection.


(3)potential transformer winding consist of few turns of thick wire and is called which winding?? 
Ans:The secondary winding


(4)which is the primary winding of the potential transformers??? 
Ans:which have  relatively large number of turns of thin wire and is called primary winding.


(5)For lower voltages up to 3.3kv which type potential transformer are used??? 
Ans: dry type PTs are used


(6)for high voltages (more than 3.3kv) which potential transformer is used???? 

Ans:oil immersed PTs are used


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