ABB Protect IT REL 501 2.5 Series Operator's Manual page 47

40
Calculate the distance to fault
7DEOH  4XDOLILHU
6\PERO 0HDQLQJ
Blank (no symbol) The calculated distance value has high accuracy.
* The distance has low accuracy.
E Error. There was not enough data to perform the calculation.
&KDSWHU 
+DQGOH WKH GLVWXUEDQFHV