Monday, 12 March 2018

What is The Application Of Current Transformer ??

Current Transformer - Which A Device That Use To Measure A Value Of Current In The Electric Line!!! 



How We Can Use Current Transformer In to Measure The Current Value And What Is The Function Of The Current Transformer!! 




A CT is a device for the transformation of current from a Higher  Values to a lower values that are suitable for measurement of the relay operation.




Besides Reducing The Current level, the CT also isolates the measuring circuit or relay circuit from the primary high power circuit.


The VA rating of CTs is very small as compared with Power and Distribution Transformers.


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The primary winding of the CT consists of one or few turns of thick wire and is connected in series with the line or load and carries the actual Power System Currents.




The Secondary Winding consists of large number of turns of thin wire and is connected to the measuring circuit or the relay

According to the construction, the CTs can be Classified into two ways


  • (i) Bar primary CTs or single turn CT wound type
  • (ii) Wound type CT




In bar primary type CT, he primary is a Straight Conductor passing through the centre of a hollow core and the secondary has a ring hollow core type iron core on which the wound uniformly over the entire periphery.





shows a bar or single turn  CT. This type of construction of CT has a Negligible Leakage flux and hence low reactance.




The wound type CTs have Magnetic Core. Figer shows wound type CT.

The two windings are wound on a magnetic iron core.

The primary winding consists of a few turns of thick wire, they can not be distributed uniformly over the iron core.

Therefore wound type CTs have high Leakage Flux and hence posseses high reactance.




Question part Related To The Current Transformer!! 

(1)What is the current transformer???? 
Ans:A CT is a device for the transformation of current from a higher  values to a lower values that are suitable for measurement of the relay operation.


(2)The VA rating of CTs is ?????
Ans:very small


(3)primary winding of current transformer have how many ternes???
Ans:The primary winding of the CT consists of one or few turns of thick wire


(4)give type of current transformer according to construction!!?? 
Ans:According to the construction, the CTs can be classified into two ways

(i) Bar primary CTs or single turn CT wound type
(ii) Wound type CT


(5)describe bar type CT?? 
Ans:In bar primary type CT, he primary is a straight conductor passing through the centre of a hollow core and the secondary has a ring hollow core type iron core on which the wound uniformly over the entire periphery.


(6)short not on wound type CT?? 
Ans:The wound type CTs have magnetic core. Figer shows wound type CT. The two windings are wound on a magnetic iron core. The primary winding consists of a few turns of thick wire, they can not be distributed uniformly over the iron core. Therefore wound type CTs have high leakage flux and hence posseses high reactance .


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