I am looking for free book or free website that can give me the basics to size the CT, PT, Over current, differential phase sequance and other relay protections.
Since 44 non-responders have checked out this question I thought I'd give it a shot.
The question is a little confusing as to your intentions. Perhaps a description of your application would elicit some better responses. There are several manufacturers of protection relays that cover over-voltage, under voltage, phase loss, rotation reversal, etc. all at a very reasonable price.
There are also several applications that use CT's or PT's depending on what you are trying to monitor. In all cases, it helps if you know a little bit about what you are trying to do in order to pick the best components. Consequently, there is no information available that can anticipate every problem you may encounter. There are, however, many sources of information available if you can be more specific as to what you what you want to do. And, you may find that there are other ways to do the same thing without involving expensive CT's or PT's.
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A great troubleshooting tip...."When you eliminate the impossible, whatever remains, however improbable, must be the truth." Sir Arthur Conan Doyle
Basic Relay Protection settings
Re: Basic Relay Protection settings
