Distribution Protection

[microaid]

I have a substation Single Line Diagram that indicates the protection on the 11kV circuits (which I would have expected to be Overcurrent + Earth Fault ie 50, 51, 50N, 51N) is "ICPT". Can anyone help me identify what this is as I am unfamiliar with the term? Many thanks.

 

[alehman]

Inductively Coupled Potential Transformer??
Has nothing to do with overcurrent protection.

 

[advidana]

Call or write the people if possible that made the single line and ask them what it means. A lot of drawing errors are made on the blue prints and drawings, single lines are no exception, this is a very common place for errors. Check the symbol list if any. The icpt could mean some type of instant current protection on terminals or transformer etc.