超高圧変電所の中性点接地線を用いた電磁気連続モニタリングの試み-序報-

概要

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We propose a new monitoring system by using the neutral current of transformers at substations of an electric power company named “neutral current monitoring”. It means that we have been measuring the telluric field by using the power line system in order to monitor the electromagnetic state of the underground over an extended time period. The principle of this system is as follow: the neutral points of the transformers in the substations are grounded to the earth and power lines connect them. If the neutral points of the transformers correspond to the grounded electrodes and the power line between substations corresponds to the electric wire between the electrodes, we can observe the telluric field and change of the electromagnetic structure of the underground between substations by measuring the current which flows at the neutral point of the transformer to some extent.We found that the neutral current is affected by various factors such as the geomagnetic changes and artificial noises like as the conventional telluric field observations. We would be able to investigate the underground electric conductivities near the substations by calculated response function between geomagnetic field data and neutral current data.
2009-03-30