what are the types of current transformer ?

Types of CT:    

                   Irrespective of the types of CT due to core material selected more types of CT's are popular on the basic of their use and winding.

1. CT Wound Type:

          It is type of CT in which the primary winding of more than one full turns wound on the core. The wound types CT's are used for measuring current in a circuit of high voltage where a very precise dimension is not essential.

2. CT  Bar Type:

           It is CT in which the primary winding consists of a bar of suitable size and material forming an integral part of the CT. the current line on which we have to measure current is linked to the bar. This type of CT is suitable to measure high currents.transformer lamination manufacturer

3. CT Liquid Immersed:

              Ordinary CT'S are of dry type they do not require and oil or cooling medium other than   natural air for its operation.

but a special class of C's has been developed which require use of oil or other suitable liquid of suitable characteristics arequisitioning and closing medium. These types of CT's are used in switch yards and substations for the purpose of measurement and for connecting relays etc. for protection of the device

4. Hermetically sealed CT:

                  It is a liquid immersed CT which is sealed and does not communicate with atmospheric air. A casing of appropriate material is made which does not allowed the air to be in touch with CT.

5. Ring type CT:

             It is type of CT which has an opening in the centre to provide accommodations a primary conductor through it. In these types of CT's the core is wound only for secondary winding. The conductor passing through CT itself acts as primary winding. These are the most popular type of CT's. Because of their easy availability and ready to use property.

6. Multi core CT:

                It is CT having more than one secondary core and winding with a common primary winding.The different cores of such a CT are used to connect different relays and protective devises with it. Such as one core is used for determining current other is connected with differential protection relay.

7. Multi Ratio CT:

             It is type of CT in which more than one ratio is obtainable by reconnection, tapping’s etc. in primary or secondary winding. This is the advantage of this type of CT on others. It can be used for measuring a wide range of currents conferring to the measuring conditions.