Fault indicator responsive to flow of fault current in a conductor when power flow is in one direction only

Means responsive to flow of alternating fault current in and high voltage energization of a conductor in which the power flow may be in a preferred direction or in the opposite direction depending upon the location of the fault comprising:

• a fault indicator including, a target, a magnetic core, a trip winding on said magnetic core for moving said target from a non-indicating position to a fault indicating position and voltage sensitive switch means connected to said trip winding for energizing it from a current source on application of predetermined control potential thereto;
• power flow direction responsive means energized in accordance with the voltage at which said conductor is energized and the current flow in said conductor arranged to generate said control potential when the power flow is in said preferred direction, and circuit means interconnecting said voltage sensitive switch means and said power flow direction responsive means including switch means responsive to flow of fault current in said conductor to render said voltage sensitive switch means conducting when said power flow is in said preferred direction to energize said trip winding.