Protection circuit for variable length supply cable - regulates voltage across load and control element is disconnected when measurement wire fails

摘要

The load is connected to the source through two cores of a variable length cable. The load terminals are connected through two measurement wires in the cable to a control amplifier into the supply source. The control amplifier regulates through a wire a control element maintaining constant the load voltage. Units (22, 23) disconnects the control element (9) when one of the measurement wires is damaged. They are inserted between each measurement wire (l, 6') and the control wire (21) for the control element (9).