To provide a system for changing the relay setting and a method for changing the relay setting, wherein the setting of a protective relay can be changed without fail.

The system for changing the relay setting includes section switches DM1-DM6 provided in a distribution line 110, and overcurrent relays OC1 and OC2 which monitor the distribution line 110 and is used when a distribution system formed by switching the section switches DM1-DM6 and sectioning the distribution line 110 is changed. The system for changing relay setting is, further, provided with a management device 10 which monitors a system change of the distribution line 110 for every predetermined period, calculates the set values of the overcurrent relays OC1 and OC2, based on the line constants of the changed distribution system when a distribution system change is detected and issues an instruction to change the setting of the overcurrent relays OC1 and OC2 based on the calculation results.