In this age of numerical and digital relays, CT selection and matching has taken back seat. More so because of the flexibility these relays offer in terms of accommodating and allowing on-site adjustments during testing and commissioning and not because it is irrelevant.
It is essential for protection engineers to be aware of what dictates the CT selection and applicability of CTs of certain specifications for specific purposes.
The article below presents a brief on CT selection check.
http://www.scribd.com/doc/20147450/CT-for-Generator-Protection-Rev1
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