PROTECTION RELAY DEVICE AND PROTECTION RELAY METHOD

摘要

A protection relay device includes: an analog-to-digital converter that samples an analog signal inputted from an analog input unit and converts the analog signal into digital data; a variable filter that filters and outputs the digital data, the variable filter having a filter coefficient that is varied by external control; and an adaptive controller that variably controls the filter coefficient of the variable filter so that a difference between the digital data filtered by the variable filter and a target signal decreases.