Application & Type of CDG Relay For Protection From O/c & E/F.

What is cdg relay

A little background would help.

And a less demanding request for information that is readily available by simply searching would might result in a better answer.

Current-operated, induction Disk, General-purpose electromechanical relay. Check out this site for explanation. You should be able to contact Alstom for an instruction book.

http://myelectrical.com/notes/entryid/159/electromechanical-relays

This has a little more information on topic:

https://docs.google.com/viewer?a=v&q=cache:AlNozWH3E84J:www.electricalplantdesign.co.uk/admin/index.php%3Fdir%3DRelay%2BData%252F%26download%3DCDG11_16.pdf+&hl=en&gl=us&pid=bl&srcid=ADGEESiL8JqhaIZdDajSPtCaopw-29Klz-AMvkywP7gRtuaKmN3cIpaeYRAhYX3ZJOkBxan10yOprWc1tOvmuA3N-dSUcgXwb5Mk7XTiRDbNLfEIb29aimPCqh6VawFhh02rjZIG2H0q&sig=AHIEtbRBYVt2F7b7MyoDzyH1VZ40xHy1fQ