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    Looking for help, CO-2 relay

    At what tap position would you expect to find a CO-2 relay set to when connected with 500/5 instrument transformers if it is to pickup at 200A?

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    Quote Originally Posted by jflan13 View Post
    At what tap position would you expect to find a CO-2 relay set to when connected with 500/5 instrument transformers if it is to pickup at 200A?
    If the CT is 500/5, there will be 1A of secondary current for every 100A on the primary. If you wanted the relay to pickup at 200A you would set the tap for 2A.

    2A secondary = 200A primary

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    Quote Originally Posted by seaborgium View Post
    If the CT is 500/5, there will be 1A of secondary current for every 100A on the primary. If you wanted the relay to pickup at 200A you would set the tap for 2A.

    2A secondary = 200A primary
    Thank you for the help

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  7. mookmeister80 is offline Junior Member Pro Subscriber
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    Quote Originally Posted by jflan13 View Post
    At what tap position would you expect to find a CO-2 relay set to when connected with 500/5 instrument transformers if it is to pickup at 200A?
    2A

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