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
Wednesday, March 16, 2011
Protection and Relaying - Generator protection
Generator protection settings are pretty straight forward and rule of thumb apply for the under voltage, Overvoltage, under frequency, Over frequency and Reverse Power settings.
However, while setting protection relays for generators that are in a large interconnected power system, it is imperative that settings are made very accurately so as to minimise disturbances to the system.
I find the calculation methods presented in the following article very useful in this sense.
http://www.pes-psrc.org/Reports/J-5CoordinationofGen.Prot%20wcpyrt.pdf
However, while setting protection relays for generators that are in a large interconnected power system, it is imperative that settings are made very accurately so as to minimise disturbances to the system.
I find the calculation methods presented in the following article very useful in this sense.
http://www.pes-psrc.org/Reports/J-5CoordinationofGen.Prot%20wcpyrt.pdf
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