Electrical fault i.e. earth fault, detecting device for alternative triphase electrical supply network of aircraft, has comparison unit to compare voltages representing sum of measurement current with detection threshold value

摘要

The device has measuring circuit for processing measurement current (i1, i2, i3) representing phase current (I1, 12, 13) flowing in network phases, and for processing voltage (V1, V2, V3) representing sum of the measurement current. A comparison unit compares the voltage with an electric fault detection threshold value. A measurement resistor (R) is connected between a common node (N) and a ground. The circuit has measurement transformers (T1, T2, T3) whose rotor is connected to resistors (R1, R2, R3).