Abstract
Chaque été, depuis trois ans déjà l'observatoire météorologique central a pu faire connaitre d'avance les temps orageux à ceux qui s'occupent d'industries chargées de fournir les courants électriques. Cela a eu pour résultat de diminuer les pertes causées par l'interruption des courants électriques. Nous donnons ici le résumé de ce que comporte cette prévision dont l'utilisation sera traitée dans la 2ème partie. The electric power consumed in the districts of Tokyo and Yokohama amounts, at present, to 620, 000 K. W. at maximum. The greater part of this power is obtained through hydroelectric plants, transmitted by long transmission lines passing through localities where thunder-storms are frequent especially during the summer season, resulting in service interruptions frequently. The Tokyo Electric Light Co. and several other companies, each supplying electricity in the above two cities and neighbouring districts, cooperated with the Central Meteorological Observatory in observing and reporting of thunder clouds and thunder-storms in these districts, and on receiving warnings, they carried out appropriate measures, thus having minimized the damages caused by lightning and having reduced the extent of its influence, resulting in a remarkably improved service. The paper gives an outline on the above subjects.
In carrying out the plan, linemen along the transmission lines and operators in generating stations and substations executed the observation of thunderstorms, and reports were quickly telephoned, through the load dispatcher, to the Central Meteorological Observatory. The Central Meteorological Observatory, in turn, judging from these reports and other meteorological conditions, issued warnings for thunder-storm as to its intensity, the direction of travel, etc.
By doing so, not only the service of electricity supply has been considerably improved, but, the local characteristic of thunder-storms was cleared up, and consequently we have obtained valuable data for maintaining the existing installations and constructing new transmission lines or telephone circuits.
