METHOD FOR CONTROLLING OF ANALOG INPUT SIGNAL IN DIGITAL PROTECTION RELAY AND APPARATUS THEREOF

摘要

PURPOSE: A method and an apparatus for processing an analog input signal of a digital protection relay are provided to process accurately an input signal of a digital protection relay by calculating duplicated channels as one channel for precise processing. CONSTITUTION: An analog input signal is received from the outside when the power is applied to a digital protection relay. A first performing unit performs the calibration for a first band part. The three-phase and N-phase voltage/current are accurately adjusted according to the calibration. The calibration is performed by the first performing unit and a second performing unit. A generation unit(114) generates one signal by combining the extracted results.