Protective relaying device

A protective relaying device comprising:

• a measuring unit configured to measure a time TM necessary for a first protective relaying device to receive data of a specific position on a transmission format of a second protective relaying device from a specific position on a transmission format of the first protective relaying device, and a time TF necessary for the second protective relaying device to receive data of a specific position on the transmission format of the first protective relaying device from a specific position on the transmission format of the second protective relaying device;
• a phase difference calculating unit configured to calculate a phase difference between a phase obtained by shifting a phase of first current data input to the first protective relaying device by 180°, and a phase of second current data input to the second protective relaying device;
• a setting unit configured to calculate a target value of elimination of a sampling synchronization error caused by a difference between a transmission delay time of up-transmission, and a transmission delay time of down-transmission on the basis of the phase difference calculated by the phase difference calculating unit, and to set the calculated target value as a target value of sampling synchronization control;
• and
• a sampling synchronization control unit configured to carry out control of sampling synchronization between the first protective relaying device, and the second protective relaying device such that a difference between the time TM, and the time TF which are measured by the measuring unit becomes the target value set by the setting unit.