APPARATUS FOR INDENTIFYING FAULTS IN ELECTRIC POWER TRANSMISSION SYSTEMS

摘要

A method of identifying faults in a polyphase alternating current electric power transmission system wherein determination of the type of fault occurring is effected by monitoring the amplitudes and relative phases of fault current quantities derived from the phase currents of the system. The current quantities are preferably phase fault currents and quantities derived by addition and subtraction of phase fault currents. Apparatus for carrying out the method is also disclosed.