Current transformer function

Electrical Tutorial about Current Transformer Basics and Current Transformer Theory on how the current transformer works with just one secondary winding. It is coupled to an ammeter (A in the diagram) in its own circuit to perform this measurement. The measuring devices cannot be directly connected to the high magnitude supplies. Instrument Transformers How will you measure AC currents and voltages of very high magnitude?

You will need the measuring instruments having higher range, which literally mean huge instruments.

High line current can be stepped down for measuring devices and relays.

Current transformers are used for metering and measurement purposes.

Relays continuously monitor the power lines and feeders. In case of any abnormal power flow, they send the. A great benefit of the current. The core of the current transformer is built up with lamination of silicon steel.

For metering and indication purpose , accuracy of ratio, between primary and secondary currents are essential within normal working range. Rather it is desirable the CT . A Current Transformer ( CT ) is used to obtain reduced current signals for purpose of measurement , control and protection. They reduce the heavy current to lower values which are suitable for operation of Relays and other instruments connected to their secondary winding. A transformer is an electrical device that transfers electrical energy between two or more circuits through electromagnetic induction. Power can be transferred between the two coils through the . They are designed to present negligible load to the supply being measured and have an accurate current ratio and phase relationship to enable accurate secondary connected metering.

The current transformer works on the principle of variable flux. In the ideal current transformer , . It is only the first function that has any bearing on location. The specific application of current transformers involves in various considerations such as type of mechanical construction, ratio of primary to secondary currents, type of insulation (oil or dry type).

Due to the less expensiveness, bushing CTs are mostly used for relaying purpose in the high voltage circuits. The original magnitude can be determined by just multiplying the result with the transformation ratio. Such specially constructed transformers .