March, 2018 issue

　The special feature called harmonics outflow calculation and yard measures" is made in this magazine September, 2015 issue. Therefore "the point of the revision, a circuit classification and a conversion factor, the greatest rate of operation, the correction coefficient by the scale of the building, the commentary of the check and yard problem and measures are included in contents by the process of the first edition establishment of the harmonics restraint measures technique guideline (JEAG 9702). But it is commentary-like contents and may be puzzled when I apply it in the real spot only by reading. Therefore I included calculation examples in the material as the practice-like contents which could perform a more practical report with the actual situation of the harmonics failure by the influence this time after having let the reader of the young person engineer be conscious of the need of the measures. It is said to have a young person engineer understand the mechanism of the calculation based on a concrete number about the commentary quantity of 1-generating of the check of the special feature, a 2-measures part in the last time.
　In addition, I sell it about the reason and measures because the issue of harmonics may occur in the yard when I meet the standard of the harmonics spillage.