| 摘要 |
<p>In one embodiment, a protective relay apparatus is provided with: a phase difference calculating means (2) for calculating the phase difference between a phase the result of shifting the phase of a first current data 180 degrees, and a phase of a second current data; a setting means (3) for calculating and setting, on the basis of the phase difference, a target value for getting rid of sampling synchronization errors generated by the difference in transmission delay time between the upward and downward directions; and a sampling synchronization controlling means (4) for conducting a sampling synchronization control so that the difference between a period of time (TM), which starts from a particular position on the transmission format of a first protective relay apparatus, and ends when the first protective relay apparatus receives data of a particular position on the transmission format of a second protective relay apparatus, and a period of time (TF), which starts from the particular position on the transmission format of the second protective relay apparatus, and ends when the second protective relay apparatus receives data of the particular position on the transmission format of the first protective relay apparatus, will become the target value.</p> |
