Looking for Protection Relay Manuals

Dear all,

I need to make a over-current protection coordination study.

Our new plant will be fed from an existing substation. The feeder to supply us in the existing substation is equipped with the following over-current relay, according to the substation owner.

TAS 6313H Alstom. 50/51/51N Inverse over-current.

I have been trying to find this relay in the Internet, however, I have not succeeded yet.

Does any one know where I can find this relay information?

Thank you.