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LT Tape Wound and Resin Cast CT
A Current
Transformer is the measuring device for metering and protection system.
The primary current of the CT is transformed into the required
secondary current of 5 A or 1 A.
Measuring CTs
have different class of accuracy I.e. 0.1, 0.2S, 0.2, 0.5S, 0.5 and 1.0
and protection CTs have 5P10, 5P20 and 10P10. In the case of special
protection CT's(PS class), the Knee Point Voltage(Vk) of the CT is
specified along with secondary resistance and magnetizing current.
The
construction of the CT not only depends upon the ratio but also on the
Short Time Current Rating. Burden and Class of Accuracy.
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