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What Parameters / Factors to consider while selecting a CT for an Application?

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Question added by Aftab Ahmed , Senior Engineer- Technical Service and Coordination Department , Pakistan Oilfields Ltd (POL)
Date Posted: 2013/12/15
Hossam Abdalla
by Hossam Abdalla , Distribution Engineer , Saudi Electricty Company

i assuming you are asking about the current transformer,

Factors are:

1- load current rating to determine the rated primary current of the CT.

2- the metering or the protection sys. used (1A or5A) to determine the secoundry of the CT.

3-Rated burden of the CT this can be detemined by CT calculation

4-Accurcy class needed

5-aplication (Metering or protection)

6-withstand short circuit current

7-Rated voltage

8- Knee point voltage for saturation

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