DIGITAL TYPE PROTECTIVE RELAY

摘要

PROBLEM TO BE SOLVED: To provide a digital type protective relay achieving redundancy of a power converter constituting a power supply part, and improvement of high conversion efficiency and reliability of electric power in the power converter.SOLUTION: A digital type protective relay 1 includes: a power supply part 2 with power converters 21, 22 connected in parallel; a power supply monitor 41 for monitoring operating states of the power converters 21, 22; and a power supply selector 42 for selecting the power converters 21, 22 to be operated. Based on a monitoring result by the power supply monitor 41, the first power converter 21 under operation is stopped and the second power converter 22 is operated.SELECTED DRAWING: Figure 1