PURPOSE: To enable constant monitoring of gas in oil which is generated in the insulating oil of an OF cable without suspending the current-carrying to the OF cable.
CONSTITUTION: The gas monitoring device is equipped with a separating and catching means 9 for the gas in oil which is installed on a connection box, etc., for the connection of the OF cable and separates and catches the gas in oil consisting of plural components contained in insulating oil from the insulating oil and an optical transmission passage 14 which is installed on the gas separating and catching means and is formed, passing through the environment in which the caught gas in oil of plural components is mixed. Further, the gas monitoring device is equipped with a luminous means 16 which generates the light which has a variety of wave length equal to each absorption spectrum of a plurality of components contained in the gas in oil and superposes the light components having different wave length, light receiving means 22 which separately extracts the light component having a single wave length equal to the above-described absorption spectrum from the light which is formed by the superposition of a variety of wave length and carries out photoelectric conversion, and a transmission means 26 which conducts light by joining the luminous means, light receiving means, and the light transmission passage.
ITOI HIROSHI
OSAWA SUSUMU
ANDO YORIO
HITACHI CABLE
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