PROTECTIVE RELAY

A protective relay which carries out various relay functions by converting externally received AC data into time widths in accordance with protective ranges and determining whether or not the protective operations are necessary on the basis of the time widths. The protective relay receives a plurality of input AC data through a time-dividing device and converts the time-divided data into the time widths for the relay functions to determine the relay operations of the relay functions on the basis of the time widths.