FAULT INDICATOR HAVING IMPROVED TRIP INHIBIT CIRCUIT

摘要

PATENT Case 851118 FAULT INDICATOR HAVING IMPROVED TRIP INHIBIT CIRCUIT Edmund O. Schweitzer, Jr. A fault indicator for indicating the occurrence of a fault current in a monitored conductor includes an electrically actuated indicator flag. Trip circuitry within the fault indicator conditions the indicator flag from a normal reset-indicating state to a fault-indicating state upon the occurrence of a fault current in the conductor. Improved high impedance trip inhibiting circuitry inhibits the trip function following a loss of voltage in the conductor whereby the fault indicator is rendered insensitive to inrush current during a period immediately following restoration of power to the system.