Method for directional detection of a fault on an electric power distribution unit

摘要

The first crossing of a minimum current level by a transient current triggers a time period during which the first crossing of a minimum threshold voltage is noted. The length of the time period is approximately equal to the maximum voltage transient time. During this period the sign of the current transient is compared with that of the transient voltage. The thresholds for current and voltage are set by an operator. An Independent claim is included for an electronic device for executing the measurement process.